mirror of
https://github.com/mozilla/gecko-dev.git
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4325 lines
160 KiB
C++
4325 lines
160 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "gfxFont.h"
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#include "mozilla/BinarySearch.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/FontPropertyTypes.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/IntegerRange.h"
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#include "mozilla/intl/Segmenter.h"
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#include "mozilla/MathAlgorithms.h"
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#include "mozilla/StaticPrefs_gfx.h"
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#include "mozilla/ScopeExit.h"
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#include "mozilla/SVGContextPaint.h"
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#include "mozilla/Logging.h"
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#include "nsITimer.h"
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#include "gfxGlyphExtents.h"
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#include "gfxPlatform.h"
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#include "gfxTextRun.h"
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#include "nsGkAtoms.h"
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#include "gfxTypes.h"
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#include "gfxContext.h"
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#include "gfxFontMissingGlyphs.h"
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#include "gfxGraphiteShaper.h"
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#include "gfxHarfBuzzShaper.h"
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#include "gfxUserFontSet.h"
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#include "nsCRT.h"
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#include "nsSpecialCasingData.h"
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#include "nsTextRunTransformations.h"
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#include "nsUGenCategory.h"
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#include "nsUnicodeProperties.h"
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#include "nsStyleConsts.h"
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#include "mozilla/AppUnits.h"
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#include "mozilla/Likely.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/Services.h"
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#include "mozilla/Telemetry.h"
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#include "gfxMathTable.h"
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#include "gfxSVGGlyphs.h"
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#include "gfx2DGlue.h"
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#include "TextDrawTarget.h"
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#include "ThebesRLBox.h"
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#include "GreekCasing.h"
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#include "cairo.h"
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#ifdef XP_WIN
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# include "cairo-win32.h"
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# include "gfxWindowsPlatform.h"
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#endif
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#include "harfbuzz/hb.h"
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#include "harfbuzz/hb-ot.h"
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#include <algorithm>
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#include <limits>
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#include <cmath>
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using namespace mozilla;
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using namespace mozilla::gfx;
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using namespace mozilla::unicode;
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using mozilla::services::GetObserverService;
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gfxFontCache* gfxFontCache::gGlobalCache = nullptr;
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#ifdef DEBUG_roc
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# define DEBUG_TEXT_RUN_STORAGE_METRICS
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#endif
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#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
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uint32_t gTextRunStorageHighWaterMark = 0;
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uint32_t gTextRunStorage = 0;
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uint32_t gFontCount = 0;
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uint32_t gGlyphExtentsCount = 0;
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uint32_t gGlyphExtentsWidthsTotalSize = 0;
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uint32_t gGlyphExtentsSetupEagerSimple = 0;
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uint32_t gGlyphExtentsSetupEagerTight = 0;
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uint32_t gGlyphExtentsSetupLazyTight = 0;
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uint32_t gGlyphExtentsSetupFallBackToTight = 0;
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#endif
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#define LOG_FONTINIT(args) \
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MOZ_LOG(gfxPlatform::GetLog(eGfxLog_fontinit), LogLevel::Debug, args)
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#define LOG_FONTINIT_ENABLED() \
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MOZ_LOG_TEST(gfxPlatform::GetLog(eGfxLog_fontinit), LogLevel::Debug)
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/*
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* gfxFontCache - global cache of gfxFont instances.
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* Expires unused fonts after a short interval;
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* notifies fonts to age their cached shaped-word records;
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* observes memory-pressure notification and tells fonts to clear their
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* shaped-word caches to free up memory.
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*/
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MOZ_DEFINE_MALLOC_SIZE_OF(FontCacheMallocSizeOf)
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NS_IMPL_ISUPPORTS(gfxFontCache::MemoryReporter, nsIMemoryReporter)
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/*virtual*/
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gfxTextRunFactory::~gfxTextRunFactory() {
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// Should not be dropped by stylo
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MOZ_ASSERT(!Servo_IsWorkerThread());
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}
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NS_IMETHODIMP
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gfxFontCache::MemoryReporter::CollectReports(
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nsIHandleReportCallback* aHandleReport, nsISupports* aData,
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bool aAnonymize) {
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FontCacheSizes sizes;
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gfxFontCache::GetCache()->AddSizeOfIncludingThis(&FontCacheMallocSizeOf,
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&sizes);
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MOZ_COLLECT_REPORT("explicit/gfx/font-cache", KIND_HEAP, UNITS_BYTES,
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sizes.mFontInstances,
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"Memory used for active font instances.");
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MOZ_COLLECT_REPORT("explicit/gfx/font-shaped-words", KIND_HEAP, UNITS_BYTES,
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sizes.mShapedWords,
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"Memory used to cache shaped glyph data.");
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return NS_OK;
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}
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NS_IMPL_ISUPPORTS(gfxFontCache::Observer, nsIObserver)
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NS_IMETHODIMP
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gfxFontCache::Observer::Observe(nsISupports* aSubject, const char* aTopic,
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const char16_t* someData) {
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if (!nsCRT::strcmp(aTopic, "memory-pressure")) {
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gfxFontCache* fontCache = gfxFontCache::GetCache();
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if (fontCache) {
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fontCache->FlushShapedWordCaches();
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}
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} else {
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MOZ_ASSERT_UNREACHABLE("unexpected notification topic");
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}
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return NS_OK;
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}
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nsresult gfxFontCache::Init() {
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NS_ASSERTION(!gGlobalCache, "Where did this come from?");
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gGlobalCache = new gfxFontCache(GetMainThreadSerialEventTarget());
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if (!gGlobalCache) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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RegisterStrongMemoryReporter(new MemoryReporter());
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return NS_OK;
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}
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void gfxFontCache::Shutdown() {
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delete gGlobalCache;
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gGlobalCache = nullptr;
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#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
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printf("Textrun storage high water mark=%d\n", gTextRunStorageHighWaterMark);
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printf("Total number of fonts=%d\n", gFontCount);
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printf("Total glyph extents allocated=%d (size %d)\n", gGlyphExtentsCount,
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int(gGlyphExtentsCount * sizeof(gfxGlyphExtents)));
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printf("Total glyph extents width-storage size allocated=%d\n",
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gGlyphExtentsWidthsTotalSize);
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printf("Number of simple glyph extents eagerly requested=%d\n",
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gGlyphExtentsSetupEagerSimple);
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printf("Number of tight glyph extents eagerly requested=%d\n",
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gGlyphExtentsSetupEagerTight);
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printf("Number of tight glyph extents lazily requested=%d\n",
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gGlyphExtentsSetupLazyTight);
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printf("Number of simple glyph extent setups that fell back to tight=%d\n",
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gGlyphExtentsSetupFallBackToTight);
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#endif
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}
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gfxFontCache::gfxFontCache(nsIEventTarget* aEventTarget)
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: ExpirationTrackerImpl<gfxFont, 3, Lock, AutoLock>(
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FONT_TIMEOUT_SECONDS * 1000, "gfxFontCache", aEventTarget) {
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nsCOMPtr<nsIObserverService> obs = GetObserverService();
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if (obs) {
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obs->AddObserver(new Observer, "memory-pressure", false);
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}
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nsIEventTarget* target = nullptr;
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if (XRE_IsContentProcess() && NS_IsMainThread()) {
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target = aEventTarget;
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}
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// Create the timer used to expire shaped-word records from each font's
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// cache after a short period of non-use. We have a single timer in
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// gfxFontCache that loops over all fonts known to the cache, to avoid
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// the overhead of individual timers in each font instance.
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// The timer will be started any time shaped word records are cached
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// (and pauses itself when all caches become empty).
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mWordCacheExpirationTimer = NS_NewTimer(target);
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}
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gfxFontCache::~gfxFontCache() {
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// Ensure the user font cache releases its references to font entries,
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// so they aren't kept alive after the font instances and font-list
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// have been shut down.
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gfxUserFontSet::UserFontCache::Shutdown();
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if (mWordCacheExpirationTimer) {
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mWordCacheExpirationTimer->Cancel();
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mWordCacheExpirationTimer = nullptr;
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}
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// Expire everything that has a zero refcount, so we don't leak them.
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AgeAllGenerations();
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// All fonts should be gone.
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NS_WARNING_ASSERTION(mFonts.Count() == 0,
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"Fonts still alive while shutting down gfxFontCache");
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// Note that we have to delete everything through the expiration
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// tracker, since there might be fonts not in the hashtable but in
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// the tracker.
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}
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bool gfxFontCache::HashEntry::KeyEquals(const KeyTypePointer aKey) const {
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const gfxCharacterMap* fontUnicodeRangeMap = mFont->GetUnicodeRangeMap();
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return aKey->mFontEntry == mFont->GetFontEntry() &&
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aKey->mStyle->Equals(*mFont->GetStyle()) &&
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((!aKey->mUnicodeRangeMap && !fontUnicodeRangeMap) ||
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(aKey->mUnicodeRangeMap && fontUnicodeRangeMap &&
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aKey->mUnicodeRangeMap->Equals(fontUnicodeRangeMap)));
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}
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gfxFont* gfxFontCache::Lookup(const gfxFontEntry* aFontEntry,
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const gfxFontStyle* aStyle,
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const gfxCharacterMap* aUnicodeRangeMap) {
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MutexAutoLock lock(mMutex);
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Key key(aFontEntry, aStyle, aUnicodeRangeMap);
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HashEntry* entry = mFonts.GetEntry(key);
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Telemetry::Accumulate(Telemetry::FONT_CACHE_HIT, entry != nullptr);
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return entry ? entry->mFont : nullptr;
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}
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void gfxFontCache::AddNew(gfxFont* aFont) {
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gfxFont* oldFont;
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{
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MutexAutoLock lock(mMutex);
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Key key(aFont->GetFontEntry(), aFont->GetStyle(),
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aFont->GetUnicodeRangeMap());
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HashEntry* entry = mFonts.PutEntry(key);
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if (!entry) {
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return;
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}
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oldFont = entry->mFont;
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entry->mFont = aFont;
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// Assert that we can find the entry we just put in (this fails if the key
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// has a NaN float value in it, e.g. 'sizeAdjust').
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MOZ_ASSERT(entry == mFonts.GetEntry(key));
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}
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// If someone's asked us to replace an existing font entry, then that's a
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// bit weird, but let it happen, and expire the old font if it's not used.
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if (oldFont && oldFont->GetExpirationState()->IsTracked()) {
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// if oldFont == aFont, recount should be > 0,
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// so we shouldn't be here.
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NS_ASSERTION(aFont != oldFont, "new font is tracked for expiry!");
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NotifyExpired(oldFont);
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}
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}
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void gfxFontCache::NotifyReleased(gfxFont* aFont) {
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if (NS_FAILED(AddObject(aFont))) {
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// We couldn't track it for some reason. Kill it now.
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DestroyFont(aFont);
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}
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// Note that we might have fonts that aren't in the hashtable, perhaps because
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// of OOM adding to the hashtable or because someone did an AddNew where
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// we already had a font. These fonts are added to the expiration tracker
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// anyway, even though Lookup can't resurrect them. Eventually they will
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// expire and be deleted.
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}
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void gfxFontCache::NotifyExpiredLocked(gfxFont* aFont, const AutoLock& aLock) {
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aFont->ClearCachedWords();
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RemoveObjectLocked(aFont, aLock);
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DestroyFontLocked(aFont);
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}
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void gfxFontCache::NotifyExpired(gfxFont* aFont) {
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aFont->ClearCachedWords();
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RemoveObject(aFont);
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DestroyFont(aFont);
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}
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void gfxFontCache::DestroyFontLocked(gfxFont* aFont) {
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Key key(aFont->GetFontEntry(), aFont->GetStyle(),
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aFont->GetUnicodeRangeMap());
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HashEntry* entry = mFonts.GetEntry(key);
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if (entry && entry->mFont == aFont) {
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mFonts.RemoveEntry(entry);
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}
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NS_ASSERTION(aFont->GetRefCount() == 0,
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"Destroying with non-zero ref count!");
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MutexAutoUnlock unlock(mMutex);
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delete aFont;
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}
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void gfxFontCache::DestroyFont(gfxFont* aFont) {
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{
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MutexAutoLock lock(mMutex);
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Key key(aFont->GetFontEntry(), aFont->GetStyle(),
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aFont->GetUnicodeRangeMap());
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HashEntry* entry = mFonts.GetEntry(key);
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if (entry && entry->mFont == aFont) {
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mFonts.RemoveEntry(entry);
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}
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}
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NS_ASSERTION(aFont->GetRefCount() == 0,
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"Destroying with non-zero ref count!");
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delete aFont;
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}
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/*static*/
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void gfxFontCache::WordCacheExpirationTimerCallback(nsITimer* aTimer,
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void* aCache) {
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gfxFontCache* cache = static_cast<gfxFontCache*>(aCache);
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cache->AgeCachedWords();
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}
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void gfxFontCache::AgeCachedWords() {
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bool allEmpty = true;
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{
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MutexAutoLock lock(mMutex);
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for (const auto& entry : mFonts) {
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allEmpty = entry.mFont->AgeCachedWords() && allEmpty;
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}
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}
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if (allEmpty) {
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PauseWordCacheExpirationTimer();
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}
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}
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void gfxFontCache::FlushShapedWordCaches() {
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{
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MutexAutoLock lock(mMutex);
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for (const auto& entry : mFonts) {
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entry.mFont->ClearCachedWords();
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}
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}
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PauseWordCacheExpirationTimer();
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}
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void gfxFontCache::NotifyGlyphsChanged() {
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MutexAutoLock lock(mMutex);
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for (const auto& entry : mFonts) {
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entry.mFont->NotifyGlyphsChanged();
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}
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}
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void gfxFontCache::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
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FontCacheSizes* aSizes) const {
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// TODO: add the overhead of the expiration tracker (generation arrays)
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MutexAutoLock lock(*const_cast<Mutex*>(&mMutex));
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aSizes->mFontInstances += mFonts.ShallowSizeOfExcludingThis(aMallocSizeOf);
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for (const auto& entry : mFonts) {
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entry.mFont->AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
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}
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}
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void gfxFontCache::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
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FontCacheSizes* aSizes) const {
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aSizes->mFontInstances += aMallocSizeOf(this);
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AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
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}
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#define MAX_SSXX_VALUE 99
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#define MAX_CVXX_VALUE 99
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static void LookupAlternateValues(const gfxFontFeatureValueSet& aFeatureLookup,
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const nsACString& aFamily,
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const StyleVariantAlternates& aAlternates,
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nsTArray<gfxFontFeature>& aFontFeatures) {
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using Tag = StyleVariantAlternates::Tag;
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// historical-forms gets handled in nsFont::AddFontFeaturesToStyle.
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if (aAlternates.IsHistoricalForms()) {
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return;
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}
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gfxFontFeature feature;
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if (aAlternates.IsCharacterVariant()) {
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for (auto& ident : aAlternates.AsCharacterVariant().AsSpan()) {
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Span<const uint32_t> values = aFeatureLookup.GetFontFeatureValuesFor(
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aFamily, NS_FONT_VARIANT_ALTERNATES_CHARACTER_VARIANT,
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ident.AsAtom());
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// nothing defined, skip
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if (values.IsEmpty()) {
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continue;
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}
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NS_ASSERTION(values.Length() <= 2,
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"too many values allowed for character-variant");
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// character-variant(12 3) ==> 'cv12' = 3
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uint32_t nn = values[0];
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// ignore values greater than 99
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if (nn == 0 || nn > MAX_CVXX_VALUE) {
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continue;
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}
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feature.mValue = values.Length() > 1 ? values[1] : 1;
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feature.mTag = HB_TAG('c', 'v', ('0' + nn / 10), ('0' + nn % 10));
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aFontFeatures.AppendElement(feature);
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}
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return;
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}
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if (aAlternates.IsStyleset()) {
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for (auto& ident : aAlternates.AsStyleset().AsSpan()) {
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Span<const uint32_t> values = aFeatureLookup.GetFontFeatureValuesFor(
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aFamily, NS_FONT_VARIANT_ALTERNATES_STYLESET, ident.AsAtom());
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// styleset(1 2 7) ==> 'ss01' = 1, 'ss02' = 1, 'ss07' = 1
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feature.mValue = 1;
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for (uint32_t nn : values) {
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if (nn == 0 || nn > MAX_SSXX_VALUE) {
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continue;
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}
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feature.mTag = HB_TAG('s', 's', ('0' + nn / 10), ('0' + nn % 10));
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aFontFeatures.AppendElement(feature);
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}
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}
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return;
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}
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uint32_t constant = 0;
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nsAtom* name = nullptr;
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switch (aAlternates.tag) {
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case Tag::Swash:
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constant = NS_FONT_VARIANT_ALTERNATES_SWASH;
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name = aAlternates.AsSwash().AsAtom();
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break;
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case Tag::Stylistic:
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constant = NS_FONT_VARIANT_ALTERNATES_STYLISTIC;
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name = aAlternates.AsStylistic().AsAtom();
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break;
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case Tag::Ornaments:
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constant = NS_FONT_VARIANT_ALTERNATES_ORNAMENTS;
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name = aAlternates.AsOrnaments().AsAtom();
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break;
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case Tag::Annotation:
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constant = NS_FONT_VARIANT_ALTERNATES_ANNOTATION;
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name = aAlternates.AsAnnotation().AsAtom();
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break;
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default:
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MOZ_ASSERT_UNREACHABLE("Unknown font-variant-alternates value!");
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return;
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}
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Span<const uint32_t> values =
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aFeatureLookup.GetFontFeatureValuesFor(aFamily, constant, name);
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if (values.IsEmpty()) {
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return;
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}
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MOZ_ASSERT(values.Length() == 1,
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"too many values for font-specific font-variant-alternates");
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feature.mValue = values[0];
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switch (aAlternates.tag) {
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case Tag::Swash: // swsh, cswh
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feature.mTag = HB_TAG('s', 'w', 's', 'h');
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aFontFeatures.AppendElement(feature);
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feature.mTag = HB_TAG('c', 's', 'w', 'h');
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break;
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case Tag::Stylistic: // salt
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feature.mTag = HB_TAG('s', 'a', 'l', 't');
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break;
|
|
case Tag::Ornaments: // ornm
|
|
feature.mTag = HB_TAG('o', 'r', 'n', 'm');
|
|
break;
|
|
case Tag::Annotation: // nalt
|
|
feature.mTag = HB_TAG('n', 'a', 'l', 't');
|
|
break;
|
|
default:
|
|
MOZ_ASSERT_UNREACHABLE("how?");
|
|
return;
|
|
}
|
|
aFontFeatures.AppendElement(feature);
|
|
}
|
|
|
|
/* static */
|
|
void gfxFontShaper::MergeFontFeatures(
|
|
const gfxFontStyle* aStyle, const nsTArray<gfxFontFeature>& aFontFeatures,
|
|
bool aDisableLigatures, const nsACString& aFamilyName, bool aAddSmallCaps,
|
|
void (*aHandleFeature)(const uint32_t&, uint32_t&, void*),
|
|
void* aHandleFeatureData) {
|
|
const nsTArray<gfxFontFeature>& styleRuleFeatures = aStyle->featureSettings;
|
|
|
|
// Bail immediately if nothing to do, which is the common case.
|
|
if (styleRuleFeatures.IsEmpty() && aFontFeatures.IsEmpty() &&
|
|
!aDisableLigatures &&
|
|
aStyle->variantCaps == NS_FONT_VARIANT_CAPS_NORMAL &&
|
|
aStyle->variantSubSuper == NS_FONT_VARIANT_POSITION_NORMAL &&
|
|
aStyle->variantAlternates.IsEmpty()) {
|
|
return;
|
|
}
|
|
|
|
nsTHashMap<nsUint32HashKey, uint32_t> mergedFeatures;
|
|
|
|
// add feature values from font
|
|
for (const gfxFontFeature& feature : aFontFeatures) {
|
|
mergedFeatures.InsertOrUpdate(feature.mTag, feature.mValue);
|
|
}
|
|
|
|
// font-variant-caps - handled here due to the need for fallback handling
|
|
// petite caps cases can fallback to appropriate smallcaps
|
|
uint32_t variantCaps = aStyle->variantCaps;
|
|
switch (variantCaps) {
|
|
case NS_FONT_VARIANT_CAPS_NORMAL:
|
|
break;
|
|
|
|
case NS_FONT_VARIANT_CAPS_ALLSMALL:
|
|
mergedFeatures.InsertOrUpdate(HB_TAG('c', '2', 's', 'c'), 1);
|
|
// fall through to the small-caps case
|
|
[[fallthrough]];
|
|
|
|
case NS_FONT_VARIANT_CAPS_SMALLCAPS:
|
|
mergedFeatures.InsertOrUpdate(HB_TAG('s', 'm', 'c', 'p'), 1);
|
|
break;
|
|
|
|
case NS_FONT_VARIANT_CAPS_ALLPETITE:
|
|
mergedFeatures.InsertOrUpdate(aAddSmallCaps ? HB_TAG('c', '2', 's', 'c')
|
|
: HB_TAG('c', '2', 'p', 'c'),
|
|
1);
|
|
// fall through to the petite-caps case
|
|
[[fallthrough]];
|
|
|
|
case NS_FONT_VARIANT_CAPS_PETITECAPS:
|
|
mergedFeatures.InsertOrUpdate(aAddSmallCaps ? HB_TAG('s', 'm', 'c', 'p')
|
|
: HB_TAG('p', 'c', 'a', 'p'),
|
|
1);
|
|
break;
|
|
|
|
case NS_FONT_VARIANT_CAPS_TITLING:
|
|
mergedFeatures.InsertOrUpdate(HB_TAG('t', 'i', 't', 'l'), 1);
|
|
break;
|
|
|
|
case NS_FONT_VARIANT_CAPS_UNICASE:
|
|
mergedFeatures.InsertOrUpdate(HB_TAG('u', 'n', 'i', 'c'), 1);
|
|
break;
|
|
|
|
default:
|
|
MOZ_ASSERT_UNREACHABLE("Unexpected variantCaps");
|
|
break;
|
|
}
|
|
|
|
// font-variant-position - handled here due to the need for fallback
|
|
switch (aStyle->variantSubSuper) {
|
|
case NS_FONT_VARIANT_POSITION_NORMAL:
|
|
break;
|
|
case NS_FONT_VARIANT_POSITION_SUPER:
|
|
mergedFeatures.InsertOrUpdate(HB_TAG('s', 'u', 'p', 's'), 1);
|
|
break;
|
|
case NS_FONT_VARIANT_POSITION_SUB:
|
|
mergedFeatures.InsertOrUpdate(HB_TAG('s', 'u', 'b', 's'), 1);
|
|
break;
|
|
default:
|
|
MOZ_ASSERT_UNREACHABLE("Unexpected variantSubSuper");
|
|
break;
|
|
}
|
|
|
|
// add font-specific feature values from style rules
|
|
if (aStyle->featureValueLookup && !aStyle->variantAlternates.IsEmpty()) {
|
|
AutoTArray<gfxFontFeature, 4> featureList;
|
|
|
|
// insert list of alternate feature settings
|
|
for (auto& alternate : aStyle->variantAlternates.AsSpan()) {
|
|
LookupAlternateValues(*aStyle->featureValueLookup, aFamilyName, alternate,
|
|
featureList);
|
|
}
|
|
|
|
for (const gfxFontFeature& feature : featureList) {
|
|
mergedFeatures.InsertOrUpdate(feature.mTag, feature.mValue);
|
|
}
|
|
}
|
|
|
|
// Add features that are already resolved to tags & values in the style.
|
|
if (styleRuleFeatures.IsEmpty()) {
|
|
// Disable common ligatures if non-zero letter-spacing is in effect.
|
|
if (aDisableLigatures) {
|
|
mergedFeatures.InsertOrUpdate(HB_TAG('l', 'i', 'g', 'a'), 0);
|
|
mergedFeatures.InsertOrUpdate(HB_TAG('c', 'l', 'i', 'g'), 0);
|
|
}
|
|
} else {
|
|
for (const gfxFontFeature& feature : styleRuleFeatures) {
|
|
// A dummy feature (0,0) is used as a sentinel to separate features
|
|
// originating from font-variant-* or other high-level properties from
|
|
// those directly specified as font-feature-settings. The high-level
|
|
// features may be overridden by aDisableLigatures, while low-level
|
|
// features specified directly as tags will come last and therefore
|
|
// take precedence over everything else.
|
|
if (feature.mTag) {
|
|
mergedFeatures.InsertOrUpdate(feature.mTag, feature.mValue);
|
|
} else if (aDisableLigatures) {
|
|
// Handle ligature-disabling setting at the boundary between high-
|
|
// and low-level features.
|
|
mergedFeatures.InsertOrUpdate(HB_TAG('l', 'i', 'g', 'a'), 0);
|
|
mergedFeatures.InsertOrUpdate(HB_TAG('c', 'l', 'i', 'g'), 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (mergedFeatures.Count() != 0) {
|
|
for (auto iter = mergedFeatures.Iter(); !iter.Done(); iter.Next()) {
|
|
aHandleFeature(iter.Key(), iter.Data(), aHandleFeatureData);
|
|
}
|
|
}
|
|
}
|
|
|
|
void gfxShapedText::SetupClusterBoundaries(uint32_t aOffset,
|
|
const char16_t* aString,
|
|
uint32_t aLength) {
|
|
if (aLength == 0) {
|
|
return;
|
|
}
|
|
|
|
CompressedGlyph* const glyphs = GetCharacterGlyphs() + aOffset;
|
|
CompressedGlyph extendCluster = CompressedGlyph::MakeComplex(false, true);
|
|
|
|
// GraphemeClusterBreakIteratorUtf16 won't be able to tell us if the string
|
|
// _begins_ with a cluster-extender, so we handle that here
|
|
uint32_t ch = aString[0];
|
|
if (aLength > 1 && NS_IS_SURROGATE_PAIR(ch, aString[1])) {
|
|
ch = SURROGATE_TO_UCS4(ch, aString[1]);
|
|
}
|
|
if (IsClusterExtender(ch)) {
|
|
glyphs[0] = extendCluster;
|
|
}
|
|
|
|
intl::GraphemeClusterBreakIteratorUtf16 iter(
|
|
Span<const char16_t>(aString, aLength));
|
|
uint32_t pos = 0;
|
|
|
|
const char16_t kIdeographicSpace = 0x3000;
|
|
// Special case for Bengali: although Virama normally clusters with the
|
|
// preceding letter, we *also* want to cluster it with a following Ya
|
|
// so that when the Virama+Ya form ya-phala, this is not separated from the
|
|
// preceding letter by any letter-spacing or justification.
|
|
const char16_t kBengaliVirama = 0x09CD;
|
|
const char16_t kBengaliYa = 0x09AF;
|
|
while (pos < aLength) {
|
|
const char16_t ch = aString[pos];
|
|
if (ch == char16_t(' ') || ch == kIdeographicSpace) {
|
|
glyphs[pos].SetIsSpace();
|
|
} else if (ch == kBengaliYa) {
|
|
// Unless we're at the start, check for a preceding virama.
|
|
if (pos > 0 && aString[pos - 1] == kBengaliVirama) {
|
|
glyphs[pos] = extendCluster;
|
|
}
|
|
}
|
|
// advance iter to the next cluster-start (or end of text)
|
|
const uint32_t nextPos = *iter.Next();
|
|
// step past the first char of the cluster
|
|
++pos;
|
|
// mark all the rest as cluster-continuations
|
|
for (; pos < nextPos; ++pos) {
|
|
glyphs[pos] = extendCluster;
|
|
}
|
|
}
|
|
}
|
|
|
|
void gfxShapedText::SetupClusterBoundaries(uint32_t aOffset,
|
|
const uint8_t* aString,
|
|
uint32_t aLength) {
|
|
CompressedGlyph* glyphs = GetCharacterGlyphs() + aOffset;
|
|
const uint8_t* limit = aString + aLength;
|
|
|
|
while (aString < limit) {
|
|
if (*aString == uint8_t(' ')) {
|
|
glyphs->SetIsSpace();
|
|
}
|
|
aString++;
|
|
glyphs++;
|
|
}
|
|
}
|
|
|
|
gfxShapedText::DetailedGlyph* gfxShapedText::AllocateDetailedGlyphs(
|
|
uint32_t aIndex, uint32_t aCount) {
|
|
NS_ASSERTION(aIndex < GetLength(), "Index out of range");
|
|
|
|
if (!mDetailedGlyphs) {
|
|
mDetailedGlyphs = MakeUnique<DetailedGlyphStore>();
|
|
}
|
|
|
|
return mDetailedGlyphs->Allocate(aIndex, aCount);
|
|
}
|
|
|
|
void gfxShapedText::SetDetailedGlyphs(uint32_t aIndex, uint32_t aGlyphCount,
|
|
const DetailedGlyph* aGlyphs) {
|
|
CompressedGlyph& g = GetCharacterGlyphs()[aIndex];
|
|
|
|
MOZ_ASSERT(aIndex > 0 || g.IsLigatureGroupStart(),
|
|
"First character can't be a ligature continuation!");
|
|
|
|
if (aGlyphCount > 0) {
|
|
DetailedGlyph* details = AllocateDetailedGlyphs(aIndex, aGlyphCount);
|
|
memcpy(details, aGlyphs, sizeof(DetailedGlyph) * aGlyphCount);
|
|
}
|
|
|
|
g.SetGlyphCount(aGlyphCount);
|
|
}
|
|
|
|
#define ZWNJ 0x200C
|
|
#define ZWJ 0x200D
|
|
static inline bool IsIgnorable(uint32_t aChar) {
|
|
return (IsDefaultIgnorable(aChar)) || aChar == ZWNJ || aChar == ZWJ;
|
|
}
|
|
|
|
void gfxShapedText::SetMissingGlyph(uint32_t aIndex, uint32_t aChar,
|
|
gfxFont* aFont) {
|
|
CompressedGlyph& g = GetCharacterGlyphs()[aIndex];
|
|
uint8_t category = GetGeneralCategory(aChar);
|
|
if (category >= HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK &&
|
|
category <= HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) {
|
|
g.SetComplex(false, true);
|
|
}
|
|
|
|
// Leaving advance as zero will prevent drawing the hexbox for ignorables.
|
|
int32_t advance = 0;
|
|
if (!IsIgnorable(aChar)) {
|
|
gfxFloat width =
|
|
std::max(aFont->GetMetrics(nsFontMetrics::eHorizontal).aveCharWidth,
|
|
gfxFloat(gfxFontMissingGlyphs::GetDesiredMinWidth(
|
|
aChar, mAppUnitsPerDevUnit)));
|
|
advance = int32_t(width * mAppUnitsPerDevUnit);
|
|
}
|
|
DetailedGlyph detail = {aChar, advance, gfx::Point()};
|
|
SetDetailedGlyphs(aIndex, 1, &detail);
|
|
g.SetMissing();
|
|
}
|
|
|
|
bool gfxShapedText::FilterIfIgnorable(uint32_t aIndex, uint32_t aCh) {
|
|
if (IsIgnorable(aCh)) {
|
|
// There are a few default-ignorables of Letter category (currently,
|
|
// just the Hangul filler characters) that we'd better not discard
|
|
// if they're followed by additional characters in the same cluster.
|
|
// Some fonts use them to carry the width of a whole cluster of
|
|
// combining jamos; see bug 1238243.
|
|
auto* charGlyphs = GetCharacterGlyphs();
|
|
if (GetGenCategory(aCh) == nsUGenCategory::kLetter &&
|
|
aIndex + 1 < GetLength() && !charGlyphs[aIndex + 1].IsClusterStart()) {
|
|
return false;
|
|
}
|
|
// A compressedGlyph that is set to MISSING but has no DetailedGlyphs list
|
|
// will be zero-width/invisible, which is what we want here.
|
|
CompressedGlyph& g = charGlyphs[aIndex];
|
|
g.SetComplex(g.IsClusterStart(), g.IsLigatureGroupStart()).SetMissing();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void gfxShapedText::AdjustAdvancesForSyntheticBold(float aSynBoldOffset,
|
|
uint32_t aOffset,
|
|
uint32_t aLength) {
|
|
uint32_t synAppUnitOffset = aSynBoldOffset * mAppUnitsPerDevUnit;
|
|
CompressedGlyph* charGlyphs = GetCharacterGlyphs();
|
|
for (uint32_t i = aOffset; i < aOffset + aLength; ++i) {
|
|
CompressedGlyph* glyphData = charGlyphs + i;
|
|
if (glyphData->IsSimpleGlyph()) {
|
|
// simple glyphs ==> just add the advance
|
|
int32_t advance = glyphData->GetSimpleAdvance();
|
|
if (advance > 0) {
|
|
advance += synAppUnitOffset;
|
|
if (CompressedGlyph::IsSimpleAdvance(advance)) {
|
|
glyphData->SetSimpleGlyph(advance, glyphData->GetSimpleGlyph());
|
|
} else {
|
|
// rare case, tested by making this the default
|
|
uint32_t glyphIndex = glyphData->GetSimpleGlyph();
|
|
// convert the simple CompressedGlyph to an empty complex record
|
|
glyphData->SetComplex(true, true);
|
|
// then set its details (glyph ID with its new advance)
|
|
DetailedGlyph detail = {glyphIndex, advance, gfx::Point()};
|
|
SetDetailedGlyphs(i, 1, &detail);
|
|
}
|
|
}
|
|
} else {
|
|
// complex glyphs ==> add offset at cluster/ligature boundaries
|
|
uint32_t detailedLength = glyphData->GetGlyphCount();
|
|
if (detailedLength) {
|
|
DetailedGlyph* details = GetDetailedGlyphs(i);
|
|
if (!details) {
|
|
continue;
|
|
}
|
|
if (IsRightToLeft()) {
|
|
if (details[0].mAdvance > 0) {
|
|
details[0].mAdvance += synAppUnitOffset;
|
|
}
|
|
} else {
|
|
if (details[detailedLength - 1].mAdvance > 0) {
|
|
details[detailedLength - 1].mAdvance += synAppUnitOffset;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
float gfxFont::AngleForSyntheticOblique() const {
|
|
// If the style doesn't call for italic/oblique, or if the face already
|
|
// provides it, no synthetic style should be added.
|
|
if (mStyle.style == FontSlantStyle::NORMAL || !mStyle.allowSyntheticStyle ||
|
|
!mFontEntry->IsUpright()) {
|
|
return 0.0f;
|
|
}
|
|
|
|
// If style calls for italic, and face doesn't support it, use default
|
|
// oblique angle as a simulation.
|
|
if (mStyle.style.IsItalic()) {
|
|
return mFontEntry->SupportsItalic()
|
|
? 0.0f
|
|
: FontSlantStyle::DEFAULT_OBLIQUE_DEGREES;
|
|
}
|
|
|
|
// Default or custom oblique angle
|
|
return mStyle.style.ObliqueAngle();
|
|
}
|
|
|
|
float gfxFont::SkewForSyntheticOblique() const {
|
|
// Precomputed value of tan(kDefaultAngle), the default italic/oblique slant;
|
|
// avoids calling tan() at runtime except for custom oblique values.
|
|
static const float kTanDefaultAngle =
|
|
tan(FontSlantStyle::DEFAULT_OBLIQUE_DEGREES * (M_PI / 180.0));
|
|
|
|
float angle = AngleForSyntheticOblique();
|
|
if (angle == 0.0f) {
|
|
return 0.0f;
|
|
} else if (angle == FontSlantStyle::DEFAULT_OBLIQUE_DEGREES) {
|
|
return kTanDefaultAngle;
|
|
} else {
|
|
return tan(angle * (M_PI / 180.0));
|
|
}
|
|
}
|
|
|
|
void gfxFont::RunMetrics::CombineWith(const RunMetrics& aOther,
|
|
bool aOtherIsOnLeft) {
|
|
mAscent = std::max(mAscent, aOther.mAscent);
|
|
mDescent = std::max(mDescent, aOther.mDescent);
|
|
if (aOtherIsOnLeft) {
|
|
mBoundingBox = (mBoundingBox + gfxPoint(aOther.mAdvanceWidth, 0))
|
|
.Union(aOther.mBoundingBox);
|
|
} else {
|
|
mBoundingBox =
|
|
mBoundingBox.Union(aOther.mBoundingBox + gfxPoint(mAdvanceWidth, 0));
|
|
}
|
|
mAdvanceWidth += aOther.mAdvanceWidth;
|
|
}
|
|
|
|
gfxFont::gfxFont(const RefPtr<UnscaledFont>& aUnscaledFont,
|
|
gfxFontEntry* aFontEntry, const gfxFontStyle* aFontStyle,
|
|
AntialiasOption anAAOption)
|
|
: mFontEntry(aFontEntry),
|
|
mLock("gfxFont lock"),
|
|
mUnscaledFont(aUnscaledFont),
|
|
mStyle(*aFontStyle),
|
|
mAdjustedSize(-1.0), // negative to indicate "not yet initialized"
|
|
mFUnitsConvFactor(-1.0f), // negative to indicate "not yet initialized"
|
|
mAntialiasOption(anAAOption),
|
|
mIsValid(true),
|
|
mApplySyntheticBold(false),
|
|
mKerningEnabled(false),
|
|
mMathInitialized(false) {
|
|
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
|
|
++gFontCount;
|
|
#endif
|
|
|
|
if (MOZ_UNLIKELY(StaticPrefs::gfx_text_disable_aa_AtStartup())) {
|
|
mAntialiasOption = kAntialiasNone;
|
|
}
|
|
|
|
// Turn off AA for Ahem for testing purposes when requested.
|
|
if (MOZ_UNLIKELY(StaticPrefs::gfx_font_rendering_ahem_antialias_none() &&
|
|
mFontEntry->FamilyName().EqualsLiteral("Ahem"))) {
|
|
mAntialiasOption = kAntialiasNone;
|
|
}
|
|
|
|
mKerningSet = HasFeatureSet(HB_TAG('k', 'e', 'r', 'n'), mKerningEnabled);
|
|
}
|
|
|
|
gfxFont::~gfxFont() {
|
|
mFontEntry->NotifyFontDestroyed(this);
|
|
|
|
// Delete objects owned through atomic pointers. (Some of these may be null,
|
|
// but that's OK.)
|
|
delete mVerticalMetrics.exchange(nullptr);
|
|
delete mHarfBuzzShaper.exchange(nullptr);
|
|
delete mGraphiteShaper.exchange(nullptr);
|
|
delete mMathTable.exchange(nullptr);
|
|
delete mNonAAFont.exchange(nullptr);
|
|
|
|
if (auto* scaledFont = mAzureScaledFont.exchange(nullptr)) {
|
|
scaledFont->Release();
|
|
}
|
|
|
|
if (mGlyphChangeObservers) {
|
|
for (const auto& key : *mGlyphChangeObservers) {
|
|
key->ForgetFont();
|
|
}
|
|
}
|
|
}
|
|
|
|
// Work out whether cairo will snap inter-glyph spacing to pixels.
|
|
//
|
|
// Layout does not align text to pixel boundaries, so, with font drawing
|
|
// backends that snap glyph positions to pixels, it is important that
|
|
// inter-glyph spacing within words is always an integer number of pixels.
|
|
// This ensures that the drawing backend snaps all of the word's glyphs in the
|
|
// same direction and so inter-glyph spacing remains the same.
|
|
//
|
|
gfxFont::RoundingFlags gfxFont::GetRoundOffsetsToPixels(
|
|
DrawTarget* aDrawTarget) {
|
|
// Could do something fancy here for ScaleFactors of
|
|
// AxisAlignedTransforms, but we leave things simple.
|
|
// Not much point rounding if a matrix will mess things up anyway.
|
|
// Also check if the font already knows hint metrics is off...
|
|
if (aDrawTarget->GetTransform().HasNonTranslation() || !ShouldHintMetrics()) {
|
|
return RoundingFlags(0);
|
|
}
|
|
|
|
cairo_t* cr = static_cast<cairo_t*>(
|
|
aDrawTarget->GetNativeSurface(NativeSurfaceType::CAIRO_CONTEXT));
|
|
if (cr) {
|
|
cairo_surface_t* target = cairo_get_target(cr);
|
|
|
|
// Check whether the cairo surface's font options hint metrics.
|
|
cairo_font_options_t* fontOptions = cairo_font_options_create();
|
|
cairo_surface_get_font_options(target, fontOptions);
|
|
cairo_hint_metrics_t hintMetrics =
|
|
cairo_font_options_get_hint_metrics(fontOptions);
|
|
cairo_font_options_destroy(fontOptions);
|
|
|
|
switch (hintMetrics) {
|
|
case CAIRO_HINT_METRICS_OFF:
|
|
return RoundingFlags(0);
|
|
case CAIRO_HINT_METRICS_ON:
|
|
return RoundingFlags::kRoundX | RoundingFlags::kRoundY;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (ShouldRoundXOffset(cr)) {
|
|
return RoundingFlags::kRoundX | RoundingFlags::kRoundY;
|
|
} else {
|
|
return RoundingFlags::kRoundY;
|
|
}
|
|
}
|
|
|
|
gfxHarfBuzzShaper* gfxFont::GetHarfBuzzShaper() {
|
|
if (!mHarfBuzzShaper) {
|
|
auto* shaper = new gfxHarfBuzzShaper(this);
|
|
shaper->Initialize();
|
|
if (!mHarfBuzzShaper.compareExchange(nullptr, shaper)) {
|
|
delete shaper;
|
|
}
|
|
}
|
|
gfxHarfBuzzShaper* shaper = mHarfBuzzShaper;
|
|
return shaper->IsInitialized() ? shaper : nullptr;
|
|
}
|
|
|
|
gfxFloat gfxFont::GetGlyphAdvance(uint16_t aGID, bool aVertical) {
|
|
if (!aVertical && ProvidesGlyphWidths()) {
|
|
return GetGlyphWidth(aGID) / 65536.0;
|
|
}
|
|
if (mFUnitsConvFactor < 0.0f) {
|
|
// Metrics haven't been initialized; lock while we do that.
|
|
AutoWriteLock lock(mLock);
|
|
if (mFUnitsConvFactor < 0.0f) {
|
|
GetMetrics(nsFontMetrics::eHorizontal);
|
|
}
|
|
}
|
|
NS_ASSERTION(mFUnitsConvFactor >= 0.0f,
|
|
"missing font unit conversion factor");
|
|
if (gfxHarfBuzzShaper* shaper = GetHarfBuzzShaper()) {
|
|
if (aVertical) {
|
|
// Note that GetGlyphVAdvance may return -1 to indicate it was unable
|
|
// to retrieve vertical metrics; in that case we fall back to the
|
|
// aveCharWidth value as a default advance.
|
|
int32_t advance = shaper->GetGlyphVAdvance(aGID);
|
|
if (advance < 0) {
|
|
return GetMetrics(nsFontMetrics::eVertical).aveCharWidth;
|
|
}
|
|
return advance / 65536.0;
|
|
}
|
|
return shaper->GetGlyphHAdvance(aGID) / 65536.0;
|
|
}
|
|
return 0.0;
|
|
}
|
|
|
|
gfxFloat gfxFont::GetCharAdvance(uint32_t aUnicode, bool aVertical) {
|
|
uint32_t gid = 0;
|
|
if (ProvidesGetGlyph()) {
|
|
gid = GetGlyph(aUnicode, 0);
|
|
} else {
|
|
if (gfxHarfBuzzShaper* shaper = GetHarfBuzzShaper()) {
|
|
gid = shaper->GetNominalGlyph(aUnicode);
|
|
}
|
|
}
|
|
if (!gid) {
|
|
return -1.0;
|
|
}
|
|
return GetGlyphAdvance(gid, aVertical);
|
|
}
|
|
|
|
static void CollectLookupsByFeature(hb_face_t* aFace, hb_tag_t aTableTag,
|
|
uint32_t aFeatureIndex,
|
|
hb_set_t* aLookups) {
|
|
uint32_t lookups[32];
|
|
uint32_t i, len, offset;
|
|
|
|
offset = 0;
|
|
do {
|
|
len = ArrayLength(lookups);
|
|
hb_ot_layout_feature_get_lookups(aFace, aTableTag, aFeatureIndex, offset,
|
|
&len, lookups);
|
|
for (i = 0; i < len; i++) {
|
|
hb_set_add(aLookups, lookups[i]);
|
|
}
|
|
offset += len;
|
|
} while (len == ArrayLength(lookups));
|
|
}
|
|
|
|
static void CollectLookupsByLanguage(
|
|
hb_face_t* aFace, hb_tag_t aTableTag,
|
|
const nsTHashSet<uint32_t>& aSpecificFeatures, hb_set_t* aOtherLookups,
|
|
hb_set_t* aSpecificFeatureLookups, uint32_t aScriptIndex,
|
|
uint32_t aLangIndex) {
|
|
uint32_t reqFeatureIndex;
|
|
if (hb_ot_layout_language_get_required_feature_index(
|
|
aFace, aTableTag, aScriptIndex, aLangIndex, &reqFeatureIndex)) {
|
|
CollectLookupsByFeature(aFace, aTableTag, reqFeatureIndex, aOtherLookups);
|
|
}
|
|
|
|
uint32_t featureIndexes[32];
|
|
uint32_t i, len, offset;
|
|
|
|
offset = 0;
|
|
do {
|
|
len = ArrayLength(featureIndexes);
|
|
hb_ot_layout_language_get_feature_indexes(aFace, aTableTag, aScriptIndex,
|
|
aLangIndex, offset, &len,
|
|
featureIndexes);
|
|
|
|
for (i = 0; i < len; i++) {
|
|
uint32_t featureIndex = featureIndexes[i];
|
|
|
|
// get the feature tag
|
|
hb_tag_t featureTag;
|
|
uint32_t tagLen = 1;
|
|
hb_ot_layout_language_get_feature_tags(aFace, aTableTag, aScriptIndex,
|
|
aLangIndex, offset + i, &tagLen,
|
|
&featureTag);
|
|
|
|
// collect lookups
|
|
hb_set_t* lookups = aSpecificFeatures.Contains(featureTag)
|
|
? aSpecificFeatureLookups
|
|
: aOtherLookups;
|
|
CollectLookupsByFeature(aFace, aTableTag, featureIndex, lookups);
|
|
}
|
|
offset += len;
|
|
} while (len == ArrayLength(featureIndexes));
|
|
}
|
|
|
|
static bool HasLookupRuleWithGlyphByScript(
|
|
hb_face_t* aFace, hb_tag_t aTableTag, hb_tag_t aScriptTag,
|
|
uint32_t aScriptIndex, uint16_t aGlyph,
|
|
const nsTHashSet<uint32_t>& aDefaultFeatures,
|
|
bool& aHasDefaultFeatureWithGlyph) {
|
|
uint32_t numLangs, lang;
|
|
hb_set_t* defaultFeatureLookups = hb_set_create();
|
|
hb_set_t* nonDefaultFeatureLookups = hb_set_create();
|
|
|
|
// default lang
|
|
CollectLookupsByLanguage(aFace, aTableTag, aDefaultFeatures,
|
|
nonDefaultFeatureLookups, defaultFeatureLookups,
|
|
aScriptIndex, HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
|
|
|
|
// iterate over langs
|
|
numLangs = hb_ot_layout_script_get_language_tags(
|
|
aFace, aTableTag, aScriptIndex, 0, nullptr, nullptr);
|
|
for (lang = 0; lang < numLangs; lang++) {
|
|
CollectLookupsByLanguage(aFace, aTableTag, aDefaultFeatures,
|
|
nonDefaultFeatureLookups, defaultFeatureLookups,
|
|
aScriptIndex, lang);
|
|
}
|
|
|
|
// look for the glyph among default feature lookups
|
|
aHasDefaultFeatureWithGlyph = false;
|
|
hb_set_t* glyphs = hb_set_create();
|
|
hb_codepoint_t index = -1;
|
|
while (hb_set_next(defaultFeatureLookups, &index)) {
|
|
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index, glyphs, glyphs,
|
|
glyphs, nullptr);
|
|
if (hb_set_has(glyphs, aGlyph)) {
|
|
aHasDefaultFeatureWithGlyph = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// look for the glyph among non-default feature lookups
|
|
// if no default feature lookups contained spaces
|
|
bool hasNonDefaultFeatureWithGlyph = false;
|
|
if (!aHasDefaultFeatureWithGlyph) {
|
|
hb_set_clear(glyphs);
|
|
index = -1;
|
|
while (hb_set_next(nonDefaultFeatureLookups, &index)) {
|
|
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index, glyphs,
|
|
glyphs, glyphs, nullptr);
|
|
if (hb_set_has(glyphs, aGlyph)) {
|
|
hasNonDefaultFeatureWithGlyph = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
hb_set_destroy(glyphs);
|
|
hb_set_destroy(defaultFeatureLookups);
|
|
hb_set_destroy(nonDefaultFeatureLookups);
|
|
|
|
return aHasDefaultFeatureWithGlyph || hasNonDefaultFeatureWithGlyph;
|
|
}
|
|
|
|
static void HasLookupRuleWithGlyph(hb_face_t* aFace, hb_tag_t aTableTag,
|
|
bool& aHasGlyph, hb_tag_t aSpecificFeature,
|
|
bool& aHasGlyphSpecific, uint16_t aGlyph) {
|
|
// iterate over the scripts in the font
|
|
uint32_t numScripts, numLangs, script, lang;
|
|
hb_set_t* otherLookups = hb_set_create();
|
|
hb_set_t* specificFeatureLookups = hb_set_create();
|
|
nsTHashSet<uint32_t> specificFeature(1);
|
|
|
|
specificFeature.Insert(aSpecificFeature);
|
|
|
|
numScripts =
|
|
hb_ot_layout_table_get_script_tags(aFace, aTableTag, 0, nullptr, nullptr);
|
|
|
|
for (script = 0; script < numScripts; script++) {
|
|
// default lang
|
|
CollectLookupsByLanguage(aFace, aTableTag, specificFeature, otherLookups,
|
|
specificFeatureLookups, script,
|
|
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
|
|
|
|
// iterate over langs
|
|
numLangs = hb_ot_layout_script_get_language_tags(
|
|
aFace, HB_OT_TAG_GPOS, script, 0, nullptr, nullptr);
|
|
for (lang = 0; lang < numLangs; lang++) {
|
|
CollectLookupsByLanguage(aFace, aTableTag, specificFeature, otherLookups,
|
|
specificFeatureLookups, script, lang);
|
|
}
|
|
}
|
|
|
|
// look for the glyph among non-specific feature lookups
|
|
hb_set_t* glyphs = hb_set_create();
|
|
hb_codepoint_t index = -1;
|
|
while (hb_set_next(otherLookups, &index)) {
|
|
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index, glyphs, glyphs,
|
|
glyphs, nullptr);
|
|
if (hb_set_has(glyphs, aGlyph)) {
|
|
aHasGlyph = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// look for the glyph among specific feature lookups
|
|
hb_set_clear(glyphs);
|
|
index = -1;
|
|
while (hb_set_next(specificFeatureLookups, &index)) {
|
|
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index, glyphs, glyphs,
|
|
glyphs, nullptr);
|
|
if (hb_set_has(glyphs, aGlyph)) {
|
|
aHasGlyphSpecific = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
hb_set_destroy(glyphs);
|
|
hb_set_destroy(specificFeatureLookups);
|
|
hb_set_destroy(otherLookups);
|
|
}
|
|
|
|
nsTHashMap<nsUint32HashKey, intl::Script>* gfxFont::sScriptTagToCode = nullptr;
|
|
nsTHashSet<uint32_t>* gfxFont::sDefaultFeatures = nullptr;
|
|
|
|
static inline bool HasSubstitution(uint32_t* aBitVector, intl::Script aScript) {
|
|
return (aBitVector[static_cast<uint32_t>(aScript) >> 5] &
|
|
(1 << (static_cast<uint32_t>(aScript) & 0x1f))) != 0;
|
|
}
|
|
|
|
// union of all default substitution features across scripts
|
|
static const hb_tag_t defaultFeatures[] = {
|
|
HB_TAG('a', 'b', 'v', 'f'), HB_TAG('a', 'b', 'v', 's'),
|
|
HB_TAG('a', 'k', 'h', 'n'), HB_TAG('b', 'l', 'w', 'f'),
|
|
HB_TAG('b', 'l', 'w', 's'), HB_TAG('c', 'a', 'l', 't'),
|
|
HB_TAG('c', 'c', 'm', 'p'), HB_TAG('c', 'f', 'a', 'r'),
|
|
HB_TAG('c', 'j', 'c', 't'), HB_TAG('c', 'l', 'i', 'g'),
|
|
HB_TAG('f', 'i', 'n', '2'), HB_TAG('f', 'i', 'n', '3'),
|
|
HB_TAG('f', 'i', 'n', 'a'), HB_TAG('h', 'a', 'l', 'f'),
|
|
HB_TAG('h', 'a', 'l', 'n'), HB_TAG('i', 'n', 'i', 't'),
|
|
HB_TAG('i', 's', 'o', 'l'), HB_TAG('l', 'i', 'g', 'a'),
|
|
HB_TAG('l', 'j', 'm', 'o'), HB_TAG('l', 'o', 'c', 'l'),
|
|
HB_TAG('l', 't', 'r', 'a'), HB_TAG('l', 't', 'r', 'm'),
|
|
HB_TAG('m', 'e', 'd', '2'), HB_TAG('m', 'e', 'd', 'i'),
|
|
HB_TAG('m', 's', 'e', 't'), HB_TAG('n', 'u', 'k', 't'),
|
|
HB_TAG('p', 'r', 'e', 'f'), HB_TAG('p', 'r', 'e', 's'),
|
|
HB_TAG('p', 's', 't', 'f'), HB_TAG('p', 's', 't', 's'),
|
|
HB_TAG('r', 'c', 'l', 't'), HB_TAG('r', 'l', 'i', 'g'),
|
|
HB_TAG('r', 'k', 'r', 'f'), HB_TAG('r', 'p', 'h', 'f'),
|
|
HB_TAG('r', 't', 'l', 'a'), HB_TAG('r', 't', 'l', 'm'),
|
|
HB_TAG('t', 'j', 'm', 'o'), HB_TAG('v', 'a', 't', 'u'),
|
|
HB_TAG('v', 'e', 'r', 't'), HB_TAG('v', 'j', 'm', 'o')};
|
|
|
|
void gfxFont::CheckForFeaturesInvolvingSpace() const {
|
|
auto setInitializedFlag =
|
|
MakeScopeExit([&]() { mFontEntry->mHasSpaceFeaturesInitialized = true; });
|
|
|
|
bool log = LOG_FONTINIT_ENABLED();
|
|
TimeStamp start;
|
|
if (MOZ_UNLIKELY(log)) {
|
|
start = TimeStamp::Now();
|
|
}
|
|
|
|
bool result = false;
|
|
|
|
uint32_t spaceGlyph = GetSpaceGlyph();
|
|
if (!spaceGlyph) {
|
|
return;
|
|
}
|
|
|
|
hb_face_t* face = GetFontEntry()->GetHBFace();
|
|
|
|
// GSUB lookups - examine per script
|
|
if (hb_ot_layout_has_substitution(face)) {
|
|
// set up the script ==> code hashtable if needed
|
|
if (!sScriptTagToCode) {
|
|
sScriptTagToCode = new nsTHashMap<nsUint32HashKey, Script>(
|
|
size_t(Script::NUM_SCRIPT_CODES));
|
|
sScriptTagToCode->InsertOrUpdate(HB_TAG('D', 'F', 'L', 'T'),
|
|
Script::COMMON);
|
|
// Ensure that we don't try to look at script codes beyond what the
|
|
// current version of ICU (at runtime -- in case of system ICU)
|
|
// knows about.
|
|
Script scriptCount = Script(
|
|
std::min<int>(intl::UnicodeProperties::GetMaxNumberOfScripts() + 1,
|
|
int(Script::NUM_SCRIPT_CODES)));
|
|
for (Script s = Script::ARABIC; s < scriptCount;
|
|
s = Script(static_cast<int>(s) + 1)) {
|
|
hb_script_t script = hb_script_t(GetScriptTagForCode(s));
|
|
unsigned int scriptCount = 4;
|
|
hb_tag_t scriptTags[4];
|
|
hb_ot_tags_from_script_and_language(script, HB_LANGUAGE_INVALID,
|
|
&scriptCount, scriptTags, nullptr,
|
|
nullptr);
|
|
for (unsigned int i = 0; i < scriptCount; i++) {
|
|
sScriptTagToCode->InsertOrUpdate(scriptTags[i], s);
|
|
}
|
|
}
|
|
|
|
uint32_t numDefaultFeatures = ArrayLength(defaultFeatures);
|
|
sDefaultFeatures = new nsTHashSet<uint32_t>(numDefaultFeatures);
|
|
for (uint32_t i = 0; i < numDefaultFeatures; i++) {
|
|
sDefaultFeatures->Insert(defaultFeatures[i]);
|
|
}
|
|
}
|
|
|
|
// iterate over the scripts in the font
|
|
hb_tag_t scriptTags[8];
|
|
|
|
uint32_t len, offset = 0;
|
|
do {
|
|
len = ArrayLength(scriptTags);
|
|
hb_ot_layout_table_get_script_tags(face, HB_OT_TAG_GSUB, offset, &len,
|
|
scriptTags);
|
|
for (uint32_t i = 0; i < len; i++) {
|
|
bool isDefaultFeature = false;
|
|
Script s;
|
|
if (!HasLookupRuleWithGlyphByScript(
|
|
face, HB_OT_TAG_GSUB, scriptTags[i], offset + i, spaceGlyph,
|
|
*sDefaultFeatures, isDefaultFeature) ||
|
|
!sScriptTagToCode->Get(scriptTags[i], &s)) {
|
|
continue;
|
|
}
|
|
result = true;
|
|
uint32_t index = static_cast<uint32_t>(s) >> 5;
|
|
uint32_t bit = static_cast<uint32_t>(s) & 0x1f;
|
|
if (isDefaultFeature) {
|
|
mFontEntry->mDefaultSubSpaceFeatures[index] |= (1 << bit);
|
|
} else {
|
|
mFontEntry->mNonDefaultSubSpaceFeatures[index] |= (1 << bit);
|
|
}
|
|
}
|
|
offset += len;
|
|
} while (len == ArrayLength(scriptTags));
|
|
}
|
|
|
|
// spaces in default features of default script?
|
|
// ==> can't use word cache, skip GPOS analysis
|
|
bool canUseWordCache = true;
|
|
if (HasSubstitution(mFontEntry->mDefaultSubSpaceFeatures, Script::COMMON)) {
|
|
canUseWordCache = false;
|
|
}
|
|
|
|
// GPOS lookups - distinguish kerning from non-kerning features
|
|
mFontEntry->mHasSpaceFeaturesKerning = false;
|
|
mFontEntry->mHasSpaceFeaturesNonKerning = false;
|
|
|
|
if (canUseWordCache && hb_ot_layout_has_positioning(face)) {
|
|
bool hasKerning = false, hasNonKerning = false;
|
|
HasLookupRuleWithGlyph(face, HB_OT_TAG_GPOS, hasNonKerning,
|
|
HB_TAG('k', 'e', 'r', 'n'), hasKerning, spaceGlyph);
|
|
if (hasKerning || hasNonKerning) {
|
|
result = true;
|
|
}
|
|
mFontEntry->mHasSpaceFeaturesKerning = hasKerning;
|
|
mFontEntry->mHasSpaceFeaturesNonKerning = hasNonKerning;
|
|
}
|
|
|
|
hb_face_destroy(face);
|
|
mFontEntry->mHasSpaceFeatures = result;
|
|
|
|
if (MOZ_UNLIKELY(log)) {
|
|
TimeDuration elapsed = TimeStamp::Now() - start;
|
|
LOG_FONTINIT(
|
|
("(fontinit-spacelookups) font: %s - "
|
|
"subst default: %8.8x %8.8x %8.8x %8.8x "
|
|
"subst non-default: %8.8x %8.8x %8.8x %8.8x "
|
|
"kerning: %s non-kerning: %s time: %6.3f\n",
|
|
mFontEntry->Name().get(), mFontEntry->mDefaultSubSpaceFeatures[3],
|
|
mFontEntry->mDefaultSubSpaceFeatures[2],
|
|
mFontEntry->mDefaultSubSpaceFeatures[1],
|
|
mFontEntry->mDefaultSubSpaceFeatures[0],
|
|
mFontEntry->mNonDefaultSubSpaceFeatures[3],
|
|
mFontEntry->mNonDefaultSubSpaceFeatures[2],
|
|
mFontEntry->mNonDefaultSubSpaceFeatures[1],
|
|
mFontEntry->mNonDefaultSubSpaceFeatures[0],
|
|
(mFontEntry->mHasSpaceFeaturesKerning ? "true" : "false"),
|
|
(mFontEntry->mHasSpaceFeaturesNonKerning ? "true" : "false"),
|
|
elapsed.ToMilliseconds()));
|
|
}
|
|
}
|
|
|
|
bool gfxFont::HasSubstitutionRulesWithSpaceLookups(Script aRunScript) const {
|
|
NS_ASSERTION(GetFontEntry()->mHasSpaceFeaturesInitialized,
|
|
"need to initialize space lookup flags");
|
|
NS_ASSERTION(aRunScript < Script::NUM_SCRIPT_CODES, "weird script code");
|
|
if (aRunScript == Script::INVALID || aRunScript >= Script::NUM_SCRIPT_CODES) {
|
|
return false;
|
|
}
|
|
|
|
// default features have space lookups ==> true
|
|
if (HasSubstitution(mFontEntry->mDefaultSubSpaceFeatures, Script::COMMON) ||
|
|
HasSubstitution(mFontEntry->mDefaultSubSpaceFeatures, aRunScript)) {
|
|
return true;
|
|
}
|
|
|
|
// non-default features have space lookups and some type of
|
|
// font feature, in font or style is specified ==> true
|
|
if ((HasSubstitution(mFontEntry->mNonDefaultSubSpaceFeatures,
|
|
Script::COMMON) ||
|
|
HasSubstitution(mFontEntry->mNonDefaultSubSpaceFeatures, aRunScript)) &&
|
|
(!mStyle.featureSettings.IsEmpty() ||
|
|
!mFontEntry->mFeatureSettings.IsEmpty())) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
tainted_boolean_hint gfxFont::SpaceMayParticipateInShaping(
|
|
Script aRunScript) const {
|
|
// avoid checking fonts known not to include default space-dependent features
|
|
if (MOZ_UNLIKELY(mFontEntry->mSkipDefaultFeatureSpaceCheck)) {
|
|
if (!mKerningSet && mStyle.featureSettings.IsEmpty() &&
|
|
mFontEntry->mFeatureSettings.IsEmpty()) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (FontCanSupportGraphite()) {
|
|
if (gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
|
|
return mFontEntry->HasGraphiteSpaceContextuals();
|
|
}
|
|
}
|
|
|
|
// We record the presence of space-dependent features in the font entry
|
|
// so that subsequent instantiations for the same font face won't
|
|
// require us to re-check the tables; however, the actual check is done
|
|
// by gfxFont because not all font entry subclasses know how to create
|
|
// a harfbuzz face for introspection.
|
|
if (!mFontEntry->mHasSpaceFeaturesInitialized) {
|
|
CheckForFeaturesInvolvingSpace();
|
|
}
|
|
|
|
if (!mFontEntry->mHasSpaceFeatures) {
|
|
return false;
|
|
}
|
|
|
|
// if font has substitution rules or non-kerning positioning rules
|
|
// that involve spaces, bypass
|
|
if (HasSubstitutionRulesWithSpaceLookups(aRunScript) ||
|
|
mFontEntry->mHasSpaceFeaturesNonKerning) {
|
|
return true;
|
|
}
|
|
|
|
// if kerning explicitly enabled/disabled via font-feature-settings or
|
|
// font-kerning and kerning rules use spaces, only bypass when enabled
|
|
if (mKerningSet && mFontEntry->mHasSpaceFeaturesKerning) {
|
|
return mKerningEnabled;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool gfxFont::SupportsFeature(Script aScript, uint32_t aFeatureTag) {
|
|
if (mGraphiteShaper && gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
|
|
return GetFontEntry()->SupportsGraphiteFeature(aFeatureTag);
|
|
}
|
|
return GetFontEntry()->SupportsOpenTypeFeature(aScript, aFeatureTag);
|
|
}
|
|
|
|
bool gfxFont::SupportsVariantCaps(Script aScript, uint32_t aVariantCaps,
|
|
bool& aFallbackToSmallCaps,
|
|
bool& aSyntheticLowerToSmallCaps,
|
|
bool& aSyntheticUpperToSmallCaps) {
|
|
bool ok = true; // cases without fallback are fine
|
|
aFallbackToSmallCaps = false;
|
|
aSyntheticLowerToSmallCaps = false;
|
|
aSyntheticUpperToSmallCaps = false;
|
|
switch (aVariantCaps) {
|
|
case NS_FONT_VARIANT_CAPS_SMALLCAPS:
|
|
ok = SupportsFeature(aScript, HB_TAG('s', 'm', 'c', 'p'));
|
|
if (!ok) {
|
|
aSyntheticLowerToSmallCaps = true;
|
|
}
|
|
break;
|
|
case NS_FONT_VARIANT_CAPS_ALLSMALL:
|
|
ok = SupportsFeature(aScript, HB_TAG('s', 'm', 'c', 'p')) &&
|
|
SupportsFeature(aScript, HB_TAG('c', '2', 's', 'c'));
|
|
if (!ok) {
|
|
aSyntheticLowerToSmallCaps = true;
|
|
aSyntheticUpperToSmallCaps = true;
|
|
}
|
|
break;
|
|
case NS_FONT_VARIANT_CAPS_PETITECAPS:
|
|
ok = SupportsFeature(aScript, HB_TAG('p', 'c', 'a', 'p'));
|
|
if (!ok) {
|
|
ok = SupportsFeature(aScript, HB_TAG('s', 'm', 'c', 'p'));
|
|
aFallbackToSmallCaps = ok;
|
|
}
|
|
if (!ok) {
|
|
aSyntheticLowerToSmallCaps = true;
|
|
}
|
|
break;
|
|
case NS_FONT_VARIANT_CAPS_ALLPETITE:
|
|
ok = SupportsFeature(aScript, HB_TAG('p', 'c', 'a', 'p')) &&
|
|
SupportsFeature(aScript, HB_TAG('c', '2', 'p', 'c'));
|
|
if (!ok) {
|
|
ok = SupportsFeature(aScript, HB_TAG('s', 'm', 'c', 'p')) &&
|
|
SupportsFeature(aScript, HB_TAG('c', '2', 's', 'c'));
|
|
aFallbackToSmallCaps = ok;
|
|
}
|
|
if (!ok) {
|
|
aSyntheticLowerToSmallCaps = true;
|
|
aSyntheticUpperToSmallCaps = true;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
NS_ASSERTION(
|
|
!(ok && (aSyntheticLowerToSmallCaps || aSyntheticUpperToSmallCaps)),
|
|
"shouldn't use synthetic features if we found real ones");
|
|
|
|
NS_ASSERTION(!(!ok && aFallbackToSmallCaps),
|
|
"if we found a usable fallback, that counts as ok");
|
|
|
|
return ok;
|
|
}
|
|
|
|
bool gfxFont::SupportsSubSuperscript(uint32_t aSubSuperscript,
|
|
const uint8_t* aString, uint32_t aLength,
|
|
Script aRunScript) {
|
|
NS_ConvertASCIItoUTF16 unicodeString(reinterpret_cast<const char*>(aString),
|
|
aLength);
|
|
return SupportsSubSuperscript(aSubSuperscript, unicodeString.get(), aLength,
|
|
aRunScript);
|
|
}
|
|
|
|
bool gfxFont::SupportsSubSuperscript(uint32_t aSubSuperscript,
|
|
const char16_t* aString, uint32_t aLength,
|
|
Script aRunScript) {
|
|
NS_ASSERTION(aSubSuperscript == NS_FONT_VARIANT_POSITION_SUPER ||
|
|
aSubSuperscript == NS_FONT_VARIANT_POSITION_SUB,
|
|
"unknown value of font-variant-position");
|
|
|
|
uint32_t feature = aSubSuperscript == NS_FONT_VARIANT_POSITION_SUPER
|
|
? HB_TAG('s', 'u', 'p', 's')
|
|
: HB_TAG('s', 'u', 'b', 's');
|
|
|
|
if (!SupportsFeature(aRunScript, feature)) {
|
|
return false;
|
|
}
|
|
|
|
// xxx - for graphite, don't really know how to sniff lookups so bail
|
|
if (mGraphiteShaper && gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
|
|
return true;
|
|
}
|
|
|
|
gfxHarfBuzzShaper* shaper = GetHarfBuzzShaper();
|
|
if (!shaper) {
|
|
return false;
|
|
}
|
|
|
|
// get the hbset containing input glyphs for the feature
|
|
const hb_set_t* inputGlyphs =
|
|
mFontEntry->InputsForOpenTypeFeature(aRunScript, feature);
|
|
|
|
// create an hbset containing default glyphs for the script run
|
|
hb_set_t* defaultGlyphsInRun = hb_set_create();
|
|
|
|
// for each character, get the glyph id
|
|
for (uint32_t i = 0; i < aLength; i++) {
|
|
uint32_t ch = aString[i];
|
|
|
|
if (i + 1 < aLength && NS_IS_SURROGATE_PAIR(ch, aString[i + 1])) {
|
|
i++;
|
|
ch = SURROGATE_TO_UCS4(ch, aString[i]);
|
|
}
|
|
|
|
hb_codepoint_t gid = shaper->GetNominalGlyph(ch);
|
|
hb_set_add(defaultGlyphsInRun, gid);
|
|
}
|
|
|
|
// intersect with input glyphs, if size is not the same ==> fallback
|
|
uint32_t origSize = hb_set_get_population(defaultGlyphsInRun);
|
|
hb_set_intersect(defaultGlyphsInRun, inputGlyphs);
|
|
uint32_t intersectionSize = hb_set_get_population(defaultGlyphsInRun);
|
|
hb_set_destroy(defaultGlyphsInRun);
|
|
|
|
return origSize == intersectionSize;
|
|
}
|
|
|
|
bool gfxFont::FeatureWillHandleChar(Script aRunScript, uint32_t aFeature,
|
|
uint32_t aUnicode) {
|
|
if (!SupportsFeature(aRunScript, aFeature)) {
|
|
return false;
|
|
}
|
|
|
|
// xxx - for graphite, don't really know how to sniff lookups so bail
|
|
if (mGraphiteShaper && gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
|
|
return true;
|
|
}
|
|
|
|
if (gfxHarfBuzzShaper* shaper = GetHarfBuzzShaper()) {
|
|
// get the hbset containing input glyphs for the feature
|
|
const hb_set_t* inputGlyphs =
|
|
mFontEntry->InputsForOpenTypeFeature(aRunScript, aFeature);
|
|
|
|
hb_codepoint_t gid = shaper->GetNominalGlyph(aUnicode);
|
|
return hb_set_has(inputGlyphs, gid);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool gfxFont::HasFeatureSet(uint32_t aFeature, bool& aFeatureOn) {
|
|
aFeatureOn = false;
|
|
|
|
if (mStyle.featureSettings.IsEmpty() &&
|
|
GetFontEntry()->mFeatureSettings.IsEmpty()) {
|
|
return false;
|
|
}
|
|
|
|
// add feature values from font
|
|
bool featureSet = false;
|
|
uint32_t i, count;
|
|
|
|
nsTArray<gfxFontFeature>& fontFeatures = GetFontEntry()->mFeatureSettings;
|
|
count = fontFeatures.Length();
|
|
for (i = 0; i < count; i++) {
|
|
const gfxFontFeature& feature = fontFeatures.ElementAt(i);
|
|
if (feature.mTag == aFeature) {
|
|
featureSet = true;
|
|
aFeatureOn = (feature.mValue != 0);
|
|
}
|
|
}
|
|
|
|
// add feature values from style rules
|
|
nsTArray<gfxFontFeature>& styleFeatures = mStyle.featureSettings;
|
|
count = styleFeatures.Length();
|
|
for (i = 0; i < count; i++) {
|
|
const gfxFontFeature& feature = styleFeatures.ElementAt(i);
|
|
if (feature.mTag == aFeature) {
|
|
featureSet = true;
|
|
aFeatureOn = (feature.mValue != 0);
|
|
}
|
|
}
|
|
|
|
return featureSet;
|
|
}
|
|
|
|
already_AddRefed<mozilla::gfx::ScaledFont> gfxFont::GetScaledFont(
|
|
mozilla::gfx::DrawTarget* aDrawTarget) {
|
|
TextRunDrawParams params;
|
|
params.dt = aDrawTarget;
|
|
return GetScaledFont(params);
|
|
}
|
|
|
|
void gfxFont::InitializeScaledFont(
|
|
const RefPtr<mozilla::gfx::ScaledFont>& aScaledFont) {
|
|
if (!aScaledFont) {
|
|
return;
|
|
}
|
|
|
|
float angle = AngleForSyntheticOblique();
|
|
if (angle != 0.0f) {
|
|
aScaledFont->SetSyntheticObliqueAngle(angle);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A helper function in case we need to do any rounding or other
|
|
* processing here.
|
|
*/
|
|
#define ToDeviceUnits(aAppUnits, aDevUnitsPerAppUnit) \
|
|
(double(aAppUnits) * double(aDevUnitsPerAppUnit))
|
|
|
|
static AntialiasMode Get2DAAMode(gfxFont::AntialiasOption aAAOption) {
|
|
switch (aAAOption) {
|
|
case gfxFont::kAntialiasSubpixel:
|
|
return AntialiasMode::SUBPIXEL;
|
|
case gfxFont::kAntialiasGrayscale:
|
|
return AntialiasMode::GRAY;
|
|
case gfxFont::kAntialiasNone:
|
|
return AntialiasMode::NONE;
|
|
default:
|
|
return AntialiasMode::DEFAULT;
|
|
}
|
|
}
|
|
|
|
class GlyphBufferAzure {
|
|
#define AUTO_BUFFER_SIZE (2048 / sizeof(Glyph))
|
|
|
|
typedef mozilla::image::imgDrawingParams imgDrawingParams;
|
|
|
|
public:
|
|
GlyphBufferAzure(const TextRunDrawParams& aRunParams,
|
|
const FontDrawParams& aFontParams)
|
|
: mRunParams(aRunParams),
|
|
mFontParams(aFontParams),
|
|
mBuffer(*mAutoBuffer.addr()),
|
|
mBufSize(AUTO_BUFFER_SIZE),
|
|
mCapacity(0),
|
|
mNumGlyphs(0) {}
|
|
|
|
~GlyphBufferAzure() {
|
|
if (mNumGlyphs > 0) {
|
|
FlushGlyphs();
|
|
}
|
|
|
|
if (mBuffer != *mAutoBuffer.addr()) {
|
|
free(mBuffer);
|
|
}
|
|
}
|
|
|
|
// Ensure the buffer has enough space for aGlyphCount glyphs to be added,
|
|
// considering the supplied strike multipler aStrikeCount.
|
|
// This MUST be called before OutputGlyph is used to actually store glyph
|
|
// records in the buffer. It may be called repeated to add further capacity
|
|
// in case we don't know up-front exactly what will be needed.
|
|
void AddCapacity(uint32_t aGlyphCount, uint32_t aStrikeCount) {
|
|
// Calculate the new capacity and ensure it will fit within the maximum
|
|
// allowed capacity.
|
|
static const uint64_t kMaxCapacity = 64 * 1024;
|
|
mCapacity = uint32_t(std::min(
|
|
kMaxCapacity,
|
|
uint64_t(mCapacity) + uint64_t(aGlyphCount) * uint64_t(aStrikeCount)));
|
|
// See if the required capacity fits within the already-allocated space
|
|
if (mCapacity <= mBufSize) {
|
|
return;
|
|
}
|
|
// We need to grow the buffer: determine a new size, allocate, and
|
|
// copy the existing data over if we didn't use realloc (which would
|
|
// do it automatically).
|
|
mBufSize = std::max(mCapacity, mBufSize * 2);
|
|
if (mBuffer == *mAutoBuffer.addr()) {
|
|
// switching from autobuffer to malloc, so we need to copy
|
|
mBuffer = reinterpret_cast<Glyph*>(moz_xmalloc(mBufSize * sizeof(Glyph)));
|
|
std::memcpy(mBuffer, *mAutoBuffer.addr(), mNumGlyphs * sizeof(Glyph));
|
|
} else {
|
|
mBuffer = reinterpret_cast<Glyph*>(
|
|
moz_xrealloc(mBuffer, mBufSize * sizeof(Glyph)));
|
|
}
|
|
}
|
|
|
|
void OutputGlyph(uint32_t aGlyphID, const gfx::Point& aPt) {
|
|
// If the buffer is full, flush to make room for the new glyph.
|
|
if (mNumGlyphs >= mCapacity) {
|
|
// Check that AddCapacity has been used appropriately!
|
|
MOZ_ASSERT(mCapacity > 0 && mNumGlyphs == mCapacity);
|
|
Flush();
|
|
}
|
|
Glyph* glyph = mBuffer + mNumGlyphs++;
|
|
glyph->mIndex = aGlyphID;
|
|
glyph->mPosition = aPt;
|
|
}
|
|
|
|
void Flush() {
|
|
if (mNumGlyphs > 0) {
|
|
FlushGlyphs();
|
|
mNumGlyphs = 0;
|
|
}
|
|
}
|
|
|
|
const TextRunDrawParams& mRunParams;
|
|
const FontDrawParams& mFontParams;
|
|
|
|
private:
|
|
static DrawMode GetStrokeMode(DrawMode aMode) {
|
|
return aMode & (DrawMode::GLYPH_STROKE | DrawMode::GLYPH_STROKE_UNDERNEATH);
|
|
}
|
|
|
|
// Render the buffered glyphs to the draw target.
|
|
void FlushGlyphs() {
|
|
gfx::GlyphBuffer buf;
|
|
buf.mGlyphs = mBuffer;
|
|
buf.mNumGlyphs = mNumGlyphs;
|
|
|
|
const gfxContext::AzureState& state = mRunParams.context->CurrentState();
|
|
|
|
// Draw stroke first if the UNDERNEATH flag is set in drawMode.
|
|
if (mRunParams.strokeOpts &&
|
|
GetStrokeMode(mRunParams.drawMode) ==
|
|
(DrawMode::GLYPH_STROKE | DrawMode::GLYPH_STROKE_UNDERNEATH)) {
|
|
DrawStroke(state, buf);
|
|
}
|
|
|
|
if (mRunParams.drawMode & DrawMode::GLYPH_FILL) {
|
|
if (state.pattern || mFontParams.contextPaint) {
|
|
Pattern* pat;
|
|
|
|
RefPtr<gfxPattern> fillPattern;
|
|
if (mFontParams.contextPaint) {
|
|
imgDrawingParams imgParams;
|
|
fillPattern = mFontParams.contextPaint->GetFillPattern(
|
|
mRunParams.context->GetDrawTarget(),
|
|
mRunParams.context->CurrentMatrixDouble(), imgParams);
|
|
}
|
|
if (!fillPattern) {
|
|
if (state.pattern) {
|
|
RefPtr<gfxPattern> statePattern =
|
|
mRunParams.context->CurrentState().pattern;
|
|
pat = statePattern->GetPattern(mRunParams.dt,
|
|
state.patternTransformChanged
|
|
? &state.patternTransform
|
|
: nullptr);
|
|
} else {
|
|
pat = nullptr;
|
|
}
|
|
} else {
|
|
pat = fillPattern->GetPattern(mRunParams.dt);
|
|
}
|
|
|
|
if (pat) {
|
|
mRunParams.dt->FillGlyphs(mFontParams.scaledFont, buf, *pat,
|
|
mFontParams.drawOptions);
|
|
}
|
|
} else {
|
|
mRunParams.dt->FillGlyphs(mFontParams.scaledFont, buf,
|
|
ColorPattern(state.color),
|
|
mFontParams.drawOptions);
|
|
}
|
|
}
|
|
|
|
// Draw stroke if the UNDERNEATH flag is not set.
|
|
if (mRunParams.strokeOpts &&
|
|
GetStrokeMode(mRunParams.drawMode) == DrawMode::GLYPH_STROKE) {
|
|
DrawStroke(state, buf);
|
|
}
|
|
|
|
if (mRunParams.drawMode & DrawMode::GLYPH_PATH) {
|
|
mRunParams.context->EnsurePathBuilder();
|
|
Matrix mat = mRunParams.dt->GetTransform();
|
|
mFontParams.scaledFont->CopyGlyphsToBuilder(
|
|
buf, mRunParams.context->mPathBuilder, &mat);
|
|
}
|
|
}
|
|
|
|
void DrawStroke(const gfxContext::AzureState& aState,
|
|
gfx::GlyphBuffer& aBuffer) {
|
|
if (mRunParams.textStrokePattern) {
|
|
Pattern* pat = mRunParams.textStrokePattern->GetPattern(
|
|
mRunParams.dt,
|
|
aState.patternTransformChanged ? &aState.patternTransform : nullptr);
|
|
|
|
if (pat) {
|
|
FlushStroke(aBuffer, *pat);
|
|
}
|
|
} else {
|
|
FlushStroke(aBuffer,
|
|
ColorPattern(ToDeviceColor(mRunParams.textStrokeColor)));
|
|
}
|
|
}
|
|
|
|
void FlushStroke(gfx::GlyphBuffer& aBuf, const Pattern& aPattern) {
|
|
mRunParams.dt->StrokeGlyphs(mFontParams.scaledFont, aBuf, aPattern,
|
|
*mRunParams.strokeOpts,
|
|
mFontParams.drawOptions);
|
|
}
|
|
|
|
// We use an "inline" buffer automatically allocated (on the stack) as part
|
|
// of the GlyphBufferAzure object to hold the glyphs in most cases, falling
|
|
// back to a separately-allocated heap buffer if the count of buffered
|
|
// glyphs gets too big.
|
|
//
|
|
// This is basically a rudimentary AutoTArray; so why not use AutoTArray
|
|
// itself?
|
|
//
|
|
// If we used an AutoTArray, we'd want to avoid using SetLength or
|
|
// AppendElements to allocate the space we actually need, because those
|
|
// methods would default-construct the new elements.
|
|
//
|
|
// Could we use SetCapacity to reserve the necessary buffer space without
|
|
// default-constructing all the Glyph records? No, because of a failure
|
|
// that could occur when we need to grow the buffer, which happens when we
|
|
// encounter a DetailedGlyph in the textrun that refers to a sequence of
|
|
// several real glyphs. At that point, we need to add some extra capacity
|
|
// to the buffer we initially allocated based on the length of the textrun
|
|
// range we're rendering.
|
|
//
|
|
// This buffer growth would work fine as long as it still fits within the
|
|
// array's inline buffer (we just use a bit more of it), or if the buffer
|
|
// was already heap-allocated (in which case AutoTArray will use realloc(),
|
|
// preserving its contents). But a problem will arise when the initial
|
|
// capacity we allocated (based on the length of the run) fits within the
|
|
// array's inline buffer, but subsequently we need to extend the buffer
|
|
// beyond the inline buffer size, so we reallocate to the heap. Because we
|
|
// haven't "officially" filled the array with SetLength or AppendElements,
|
|
// its mLength is still zero; as far as it's concerned the buffer is just
|
|
// uninitialized space, and when it switches to use a malloc'd buffer it
|
|
// won't copy the existing contents.
|
|
|
|
// Allocate space for a buffer of Glyph records, without initializing them.
|
|
AlignedStorage2<Glyph[AUTO_BUFFER_SIZE]> mAutoBuffer;
|
|
|
|
// Pointer to the buffer we're currently using -- initially mAutoBuffer,
|
|
// but may be changed to a malloc'd buffer, in which case that buffer must
|
|
// be free'd on destruction.
|
|
Glyph* mBuffer;
|
|
|
|
uint32_t mBufSize; // size of allocated buffer; capacity can grow to
|
|
// this before reallocation is needed
|
|
uint32_t mCapacity; // amount of buffer size reserved
|
|
uint32_t mNumGlyphs; // number of glyphs actually present in the buffer
|
|
|
|
#undef AUTO_BUFFER_SIZE
|
|
};
|
|
|
|
// Bug 674909. When synthetic bolding text by drawing twice, need to
|
|
// render using a pixel offset in device pixels, otherwise text
|
|
// doesn't appear bolded, it appears as if a bad text shadow exists
|
|
// when a non-identity transform exists. Use an offset factor so that
|
|
// the second draw occurs at a constant offset in device pixels.
|
|
|
|
gfx::Float gfxFont::CalcXScale(DrawTarget* aDrawTarget) {
|
|
// determine magnitude of a 1px x offset in device space
|
|
Size t = aDrawTarget->GetTransform().TransformSize(Size(1.0, 0.0));
|
|
if (t.width == 1.0 && t.height == 0.0) {
|
|
// short-circuit the most common case to avoid sqrt() and division
|
|
return 1.0;
|
|
}
|
|
|
|
gfx::Float m = sqrtf(t.width * t.width + t.height * t.height);
|
|
|
|
NS_ASSERTION(m != 0.0, "degenerate transform while synthetic bolding");
|
|
if (m == 0.0) {
|
|
return 0.0; // effectively disables offset
|
|
}
|
|
|
|
// scale factor so that offsets are 1px in device pixels
|
|
return 1.0 / m;
|
|
}
|
|
|
|
// Draw a run of CharacterGlyph records from the given offset in aShapedText.
|
|
// Returns true if glyph paths were actually emitted.
|
|
template <gfxFont::FontComplexityT FC, gfxFont::SpacingT S>
|
|
bool gfxFont::DrawGlyphs(const gfxShapedText* aShapedText,
|
|
uint32_t aOffset, // offset in the textrun
|
|
uint32_t aCount, // length of run to draw
|
|
gfx::Point* aPt,
|
|
const gfx::Matrix* aOffsetMatrix, // may be null
|
|
GlyphBufferAzure& aBuffer) {
|
|
float& inlineCoord = aBuffer.mFontParams.isVerticalFont ? aPt->y : aPt->x;
|
|
|
|
const gfxShapedText::CompressedGlyph* glyphData =
|
|
&aShapedText->GetCharacterGlyphs()[aOffset];
|
|
|
|
if (S == SpacingT::HasSpacing) {
|
|
float space = aBuffer.mRunParams.spacing[0].mBefore *
|
|
aBuffer.mFontParams.advanceDirection;
|
|
inlineCoord += space;
|
|
}
|
|
|
|
// Allocate buffer space for the run, assuming all simple glyphs.
|
|
uint32_t capacityMult = 1 + aBuffer.mFontParams.extraStrikes;
|
|
aBuffer.AddCapacity(aCount, capacityMult);
|
|
|
|
bool emittedGlyphs = false;
|
|
|
|
for (uint32_t i = 0; i < aCount; ++i, ++glyphData) {
|
|
if (glyphData->IsSimpleGlyph()) {
|
|
float advance =
|
|
glyphData->GetSimpleAdvance() * aBuffer.mFontParams.advanceDirection;
|
|
if (aBuffer.mRunParams.isRTL) {
|
|
inlineCoord += advance;
|
|
}
|
|
DrawOneGlyph<FC>(glyphData->GetSimpleGlyph(), *aPt, aBuffer,
|
|
&emittedGlyphs);
|
|
if (!aBuffer.mRunParams.isRTL) {
|
|
inlineCoord += advance;
|
|
}
|
|
} else {
|
|
uint32_t glyphCount = glyphData->GetGlyphCount();
|
|
if (glyphCount > 0) {
|
|
// Add extra buffer capacity to allow for multiple-glyph entry.
|
|
aBuffer.AddCapacity(glyphCount - 1, capacityMult);
|
|
const gfxShapedText::DetailedGlyph* details =
|
|
aShapedText->GetDetailedGlyphs(aOffset + i);
|
|
MOZ_ASSERT(details, "missing DetailedGlyph!");
|
|
for (uint32_t j = 0; j < glyphCount; ++j, ++details) {
|
|
float advance =
|
|
details->mAdvance * aBuffer.mFontParams.advanceDirection;
|
|
if (aBuffer.mRunParams.isRTL) {
|
|
inlineCoord += advance;
|
|
}
|
|
if (glyphData->IsMissing()) {
|
|
if (!DrawMissingGlyph(aBuffer.mRunParams, aBuffer.mFontParams,
|
|
details, *aPt)) {
|
|
return false;
|
|
}
|
|
} else {
|
|
gfx::Point glyphPt(
|
|
*aPt + (aOffsetMatrix
|
|
? aOffsetMatrix->TransformPoint(details->mOffset)
|
|
: details->mOffset));
|
|
DrawOneGlyph<FC>(details->mGlyphID, glyphPt, aBuffer,
|
|
&emittedGlyphs);
|
|
}
|
|
if (!aBuffer.mRunParams.isRTL) {
|
|
inlineCoord += advance;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (S == SpacingT::HasSpacing) {
|
|
float space = aBuffer.mRunParams.spacing[i].mAfter;
|
|
if (i + 1 < aCount) {
|
|
space += aBuffer.mRunParams.spacing[i + 1].mBefore;
|
|
}
|
|
space *= aBuffer.mFontParams.advanceDirection;
|
|
inlineCoord += space;
|
|
}
|
|
}
|
|
|
|
return emittedGlyphs;
|
|
}
|
|
|
|
// Draw an individual glyph at a specific location.
|
|
// *aPt is the glyph position in appUnits; it is converted to device
|
|
// coordinates (devPt) here.
|
|
template <gfxFont::FontComplexityT FC>
|
|
void gfxFont::DrawOneGlyph(uint32_t aGlyphID, const gfx::Point& aPt,
|
|
GlyphBufferAzure& aBuffer, bool* aEmittedGlyphs) {
|
|
const TextRunDrawParams& runParams(aBuffer.mRunParams);
|
|
|
|
gfx::Point devPt(ToDeviceUnits(aPt.x, runParams.devPerApp),
|
|
ToDeviceUnits(aPt.y, runParams.devPerApp));
|
|
|
|
if (FC == FontComplexityT::ComplexFont) {
|
|
const FontDrawParams& fontParams(aBuffer.mFontParams);
|
|
|
|
auto* textDrawer = runParams.context->GetTextDrawer();
|
|
|
|
gfxContextMatrixAutoSaveRestore matrixRestore;
|
|
|
|
if (fontParams.obliqueSkew != 0.0f && fontParams.isVerticalFont &&
|
|
!textDrawer) {
|
|
// We have to flush each glyph individually when doing
|
|
// synthetic-oblique for vertical-upright text, because
|
|
// the skew transform needs to be applied to a separate
|
|
// origin for each glyph, not once for the whole run.
|
|
aBuffer.Flush();
|
|
matrixRestore.SetContext(runParams.context);
|
|
gfx::Point skewPt(
|
|
devPt.x + GetMetrics(nsFontMetrics::eVertical).emHeight / 2, devPt.y);
|
|
gfx::Matrix mat =
|
|
runParams.context->CurrentMatrix()
|
|
.PreTranslate(skewPt)
|
|
.PreMultiply(gfx::Matrix(1, fontParams.obliqueSkew, 0, 1, 0, 0))
|
|
.PreTranslate(-skewPt);
|
|
runParams.context->SetMatrix(mat);
|
|
}
|
|
|
|
if (fontParams.haveSVGGlyphs) {
|
|
if (!runParams.paintSVGGlyphs) {
|
|
return;
|
|
}
|
|
NS_WARNING_ASSERTION(
|
|
runParams.drawMode != DrawMode::GLYPH_PATH,
|
|
"Rendering SVG glyph despite request for glyph path");
|
|
if (RenderSVGGlyph(runParams.context, textDrawer, devPt, aGlyphID,
|
|
fontParams.contextPaint, runParams.callbacks,
|
|
*aEmittedGlyphs)) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (fontParams.haveColorGlyphs &&
|
|
!gfxPlatform::GetPlatform()->HasNativeColrFontSupport() &&
|
|
RenderColorGlyph(runParams.dt, runParams.context, textDrawer,
|
|
fontParams.scaledFont, fontParams.drawOptions, devPt,
|
|
aGlyphID)) {
|
|
return;
|
|
}
|
|
|
|
aBuffer.OutputGlyph(aGlyphID, devPt);
|
|
|
|
// Synthetic bolding (if required) by multi-striking.
|
|
for (int32_t i = 0; i < fontParams.extraStrikes; ++i) {
|
|
if (fontParams.isVerticalFont) {
|
|
devPt.y += fontParams.synBoldOnePixelOffset;
|
|
} else {
|
|
devPt.x += fontParams.synBoldOnePixelOffset;
|
|
}
|
|
aBuffer.OutputGlyph(aGlyphID, devPt);
|
|
}
|
|
|
|
if (fontParams.obliqueSkew != 0.0f && fontParams.isVerticalFont &&
|
|
!textDrawer) {
|
|
aBuffer.Flush();
|
|
}
|
|
} else {
|
|
aBuffer.OutputGlyph(aGlyphID, devPt);
|
|
}
|
|
|
|
*aEmittedGlyphs = true;
|
|
}
|
|
|
|
bool gfxFont::DrawMissingGlyph(const TextRunDrawParams& aRunParams,
|
|
const FontDrawParams& aFontParams,
|
|
const gfxShapedText::DetailedGlyph* aDetails,
|
|
const gfx::Point& aPt) {
|
|
// Default-ignorable chars will have zero advance width;
|
|
// we don't have to draw the hexbox for them.
|
|
float advance = aDetails->mAdvance;
|
|
if (aRunParams.drawMode != DrawMode::GLYPH_PATH && advance > 0) {
|
|
auto* textDrawer = aRunParams.context->GetTextDrawer();
|
|
const Matrix* matPtr = nullptr;
|
|
Matrix mat;
|
|
if (textDrawer) {
|
|
// Generate an orientation matrix for the current writing mode
|
|
wr::FontInstanceFlags flags = textDrawer->GetWRGlyphFlags();
|
|
if (flags & wr::FontInstanceFlags::TRANSPOSE) {
|
|
std::swap(mat._11, mat._12);
|
|
std::swap(mat._21, mat._22);
|
|
}
|
|
mat.PostScale(flags & wr::FontInstanceFlags::FLIP_X ? -1.0f : 1.0f,
|
|
flags & wr::FontInstanceFlags::FLIP_Y ? -1.0f : 1.0f);
|
|
matPtr = &mat;
|
|
}
|
|
|
|
Point pt(Float(ToDeviceUnits(aPt.x, aRunParams.devPerApp)),
|
|
Float(ToDeviceUnits(aPt.y, aRunParams.devPerApp)));
|
|
Float advanceDevUnits = Float(ToDeviceUnits(advance, aRunParams.devPerApp));
|
|
Float height = GetMetrics(nsFontMetrics::eHorizontal).maxAscent;
|
|
// Horizontally center if drawing vertically upright with no sideways
|
|
// transform.
|
|
Rect glyphRect =
|
|
aFontParams.isVerticalFont && !mat.HasNonAxisAlignedTransform()
|
|
? Rect(pt.x - height / 2, pt.y, height, advanceDevUnits)
|
|
: Rect(pt.x, pt.y - height, advanceDevUnits, height);
|
|
|
|
// If there's a fake-italic skew in effect as part
|
|
// of the drawTarget's transform, we need to undo
|
|
// this before drawing the hexbox. (Bug 983985)
|
|
gfxContextMatrixAutoSaveRestore matrixRestore;
|
|
if (aFontParams.obliqueSkew != 0.0f && !aFontParams.isVerticalFont &&
|
|
!textDrawer) {
|
|
matrixRestore.SetContext(aRunParams.context);
|
|
gfx::Matrix mat =
|
|
aRunParams.context->CurrentMatrix()
|
|
.PreTranslate(pt)
|
|
.PreMultiply(gfx::Matrix(1, 0, aFontParams.obliqueSkew, 1, 0, 0))
|
|
.PreTranslate(-pt);
|
|
aRunParams.context->SetMatrix(mat);
|
|
}
|
|
|
|
gfxFontMissingGlyphs::DrawMissingGlyph(aDetails->mGlyphID, glyphRect,
|
|
*aRunParams.dt,
|
|
PatternFromState(aRunParams.context),
|
|
1.0 / aRunParams.devPerApp, matPtr);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// This method is mostly parallel to DrawGlyphs.
|
|
void gfxFont::DrawEmphasisMarks(const gfxTextRun* aShapedText, gfx::Point* aPt,
|
|
uint32_t aOffset, uint32_t aCount,
|
|
const EmphasisMarkDrawParams& aParams) {
|
|
float& inlineCoord = aParams.isVertical ? aPt->y : aPt->x;
|
|
gfxTextRun::Range markRange(aParams.mark);
|
|
gfxTextRun::DrawParams params(aParams.context);
|
|
|
|
float clusterStart = -std::numeric_limits<float>::infinity();
|
|
bool shouldDrawEmphasisMark = false;
|
|
for (uint32_t i = 0, idx = aOffset; i < aCount; ++i, ++idx) {
|
|
if (aParams.spacing) {
|
|
inlineCoord += aParams.direction * aParams.spacing[i].mBefore;
|
|
}
|
|
if (aShapedText->IsClusterStart(idx) ||
|
|
clusterStart == -std::numeric_limits<float>::infinity()) {
|
|
clusterStart = inlineCoord;
|
|
}
|
|
if (aShapedText->CharMayHaveEmphasisMark(idx)) {
|
|
shouldDrawEmphasisMark = true;
|
|
}
|
|
inlineCoord += aParams.direction * aShapedText->GetAdvanceForGlyph(idx);
|
|
if (shouldDrawEmphasisMark &&
|
|
(i + 1 == aCount || aShapedText->IsClusterStart(idx + 1))) {
|
|
float clusterAdvance = inlineCoord - clusterStart;
|
|
// Move the coord backward to get the needed start point.
|
|
float delta = (clusterAdvance + aParams.advance) / 2;
|
|
inlineCoord -= delta;
|
|
aParams.mark->Draw(markRange, *aPt, params);
|
|
inlineCoord += delta;
|
|
shouldDrawEmphasisMark = false;
|
|
}
|
|
if (aParams.spacing) {
|
|
inlineCoord += aParams.direction * aParams.spacing[i].mAfter;
|
|
}
|
|
}
|
|
}
|
|
|
|
void gfxFont::Draw(const gfxTextRun* aTextRun, uint32_t aStart, uint32_t aEnd,
|
|
gfx::Point* aPt, const TextRunDrawParams& aRunParams,
|
|
gfx::ShapedTextFlags aOrientation) {
|
|
NS_ASSERTION(aRunParams.drawMode == DrawMode::GLYPH_PATH ||
|
|
!(int(aRunParams.drawMode) & int(DrawMode::GLYPH_PATH)),
|
|
"GLYPH_PATH cannot be used with GLYPH_FILL, GLYPH_STROKE or "
|
|
"GLYPH_STROKE_UNDERNEATH");
|
|
|
|
if (aStart >= aEnd) {
|
|
return;
|
|
}
|
|
|
|
FontDrawParams fontParams;
|
|
|
|
if (aRunParams.drawOpts) {
|
|
fontParams.drawOptions = *aRunParams.drawOpts;
|
|
}
|
|
|
|
fontParams.scaledFont = GetScaledFont(aRunParams);
|
|
if (!fontParams.scaledFont) {
|
|
return;
|
|
}
|
|
auto* textDrawer = aRunParams.context->GetTextDrawer();
|
|
|
|
fontParams.obliqueSkew = SkewForSyntheticOblique();
|
|
fontParams.haveSVGGlyphs = GetFontEntry()->TryGetSVGData(this);
|
|
fontParams.haveColorGlyphs = GetFontEntry()->TryGetColorGlyphs();
|
|
fontParams.contextPaint = aRunParams.runContextPaint;
|
|
|
|
if (textDrawer) {
|
|
fontParams.isVerticalFont = aRunParams.isVerticalRun;
|
|
} else {
|
|
fontParams.isVerticalFont =
|
|
aOrientation == gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_UPRIGHT;
|
|
}
|
|
|
|
gfxContextMatrixAutoSaveRestore matrixRestore;
|
|
layout::TextDrawTarget::AutoRestoreWRGlyphFlags glyphFlagsRestore;
|
|
|
|
// Save the current baseline offset for restoring later, in case it is
|
|
// modified.
|
|
float& baseline = fontParams.isVerticalFont ? aPt->x : aPt->y;
|
|
float origBaseline = baseline;
|
|
|
|
// The point may be advanced in local-space, while the resulting point on
|
|
// return must be advanced in transformed space. So save the original point so
|
|
// we can properly transform the advance later.
|
|
gfx::Point origPt = *aPt;
|
|
const gfx::Matrix* offsetMatrix = nullptr;
|
|
|
|
// Default to advancing along the +X direction (-X if RTL).
|
|
fontParams.advanceDirection = aRunParams.isRTL ? -1.0f : 1.0f;
|
|
// Default to offsetting baseline downward along the +Y direction.
|
|
float baselineDir = 1.0f;
|
|
// The direction of sideways rotation, if applicable.
|
|
// -1 for rotating left/counter-clockwise
|
|
// 1 for rotating right/clockwise
|
|
// 0 for no rotation
|
|
float sidewaysDir =
|
|
(aOrientation == gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT
|
|
? -1.0f
|
|
: (aOrientation ==
|
|
gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT
|
|
? 1.0f
|
|
: 0.0f));
|
|
// If we're rendering a sideways run, we need to push a rotation transform to
|
|
// the context.
|
|
if (sidewaysDir != 0.0f) {
|
|
if (textDrawer) {
|
|
// For WebRender, we can't use a DrawTarget transform and must instead use
|
|
// flags that locally transform the glyph, without affecting the glyph
|
|
// origin. The glyph origins must thus be offset in the transformed
|
|
// directions (instead of local-space directions). Modify the advance and
|
|
// baseline directions to account for the indicated transform.
|
|
|
|
// The default text orientation is down being +Y and right being +X.
|
|
// Rotating 90 degrees left/CCW makes down be +X and right be -Y.
|
|
// Rotating 90 degrees right/CW makes down be -X and right be +Y.
|
|
// Thus the advance direction (moving right) is just sidewaysDir,
|
|
// i.e. negative along Y axis if rotated left and positive if
|
|
// rotated right.
|
|
fontParams.advanceDirection *= sidewaysDir;
|
|
// The baseline direction (moving down) is negated relative to the
|
|
// advance direction for sideways transforms.
|
|
baselineDir *= -sidewaysDir;
|
|
|
|
glyphFlagsRestore.Save(textDrawer);
|
|
// Set the transform flags accordingly. Both sideways rotations transpose
|
|
// X and Y, while left rotation flips the resulting Y axis, and right
|
|
// rotation flips the resulting X axis.
|
|
textDrawer->SetWRGlyphFlags(
|
|
textDrawer->GetWRGlyphFlags() | wr::FontInstanceFlags::TRANSPOSE |
|
|
(aOrientation ==
|
|
gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT
|
|
? wr::FontInstanceFlags::FLIP_Y
|
|
: wr::FontInstanceFlags::FLIP_X));
|
|
// We also need to set up a transform for the glyph offset vector that
|
|
// may be present in DetailedGlyph records.
|
|
static const gfx::Matrix kSidewaysLeft = {0, -1, 1, 0, 0, 0};
|
|
static const gfx::Matrix kSidewaysRight = {0, 1, -1, 0, 0, 0};
|
|
offsetMatrix =
|
|
(aOrientation == ShapedTextFlags::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT)
|
|
? &kSidewaysLeft
|
|
: &kSidewaysRight;
|
|
} else {
|
|
// For non-WebRender targets, just push a rotation transform.
|
|
matrixRestore.SetContext(aRunParams.context);
|
|
gfxPoint p(aPt->x * aRunParams.devPerApp, aPt->y * aRunParams.devPerApp);
|
|
// Get a matrix we can use to draw the (horizontally-shaped) textrun
|
|
// with 90-degree CW rotation.
|
|
const gfxFloat rotation = sidewaysDir * M_PI / 2.0f;
|
|
gfxMatrix mat = aRunParams.context->CurrentMatrixDouble()
|
|
.PreTranslate(p)
|
|
. // translate origin for rotation
|
|
PreRotate(rotation)
|
|
. // turn 90deg CCW (sideways-left) or CW (*-right)
|
|
PreTranslate(-p); // undo the translation
|
|
|
|
aRunParams.context->SetMatrixDouble(mat);
|
|
}
|
|
|
|
// If we're drawing rotated horizontal text for an element styled
|
|
// text-orientation:mixed, the dominant baseline will be vertical-
|
|
// centered. So in this case, we need to adjust the position so that
|
|
// the rotated horizontal text (which uses an alphabetic baseline) will
|
|
// look OK when juxtaposed with upright glyphs (rendered on a centered
|
|
// vertical baseline). The adjustment here is somewhat ad hoc; we
|
|
// should eventually look for baseline tables[1] in the fonts and use
|
|
// those if available.
|
|
// [1] See http://www.microsoft.com/typography/otspec/base.htm
|
|
if (aTextRun->UseCenterBaseline()) {
|
|
const Metrics& metrics = GetMetrics(nsFontMetrics::eHorizontal);
|
|
float baseAdj = (metrics.emAscent - metrics.emDescent) / 2;
|
|
baseline += baseAdj * aTextRun->GetAppUnitsPerDevUnit() * baselineDir;
|
|
}
|
|
} else if (textDrawer &&
|
|
aOrientation == ShapedTextFlags::TEXT_ORIENT_VERTICAL_UPRIGHT) {
|
|
glyphFlagsRestore.Save(textDrawer);
|
|
textDrawer->SetWRGlyphFlags(textDrawer->GetWRGlyphFlags() |
|
|
wr::FontInstanceFlags::VERTICAL);
|
|
}
|
|
|
|
if (fontParams.obliqueSkew != 0.0f && !fontParams.isVerticalFont &&
|
|
!textDrawer) {
|
|
// Adjust matrix for synthetic-oblique, except if we're doing vertical-
|
|
// upright text, in which case this will be handled for each glyph
|
|
// individually in DrawOneGlyph.
|
|
if (!matrixRestore.HasMatrix()) {
|
|
matrixRestore.SetContext(aRunParams.context);
|
|
}
|
|
gfx::Point p(aPt->x * aRunParams.devPerApp, aPt->y * aRunParams.devPerApp);
|
|
gfx::Matrix mat =
|
|
aRunParams.context->CurrentMatrix()
|
|
.PreTranslate(p)
|
|
.PreMultiply(gfx::Matrix(1, 0, -fontParams.obliqueSkew, 1, 0, 0))
|
|
.PreTranslate(-p);
|
|
aRunParams.context->SetMatrix(mat);
|
|
}
|
|
|
|
RefPtr<SVGContextPaint> contextPaint;
|
|
if (fontParams.haveSVGGlyphs && !fontParams.contextPaint) {
|
|
// If no pattern is specified for fill, use the current pattern
|
|
NS_ASSERTION((int(aRunParams.drawMode) & int(DrawMode::GLYPH_STROKE)) == 0,
|
|
"no pattern supplied for stroking text");
|
|
RefPtr<gfxPattern> fillPattern = aRunParams.context->GetPattern();
|
|
contextPaint = new SimpleTextContextPaint(
|
|
fillPattern, nullptr, aRunParams.context->CurrentMatrixDouble());
|
|
fontParams.contextPaint = contextPaint.get();
|
|
}
|
|
|
|
// Synthetic-bold strikes are each offset one device pixel in run direction
|
|
// (these values are only needed if ApplySyntheticBold() is true).
|
|
// If drawing via webrender, it will do multistrike internally so we don't
|
|
// need to handle it here.
|
|
bool doMultistrikeBold = ApplySyntheticBold() && !textDrawer;
|
|
if (doMultistrikeBold) {
|
|
gfx::Float xscale = CalcXScale(aRunParams.context->GetDrawTarget());
|
|
fontParams.synBoldOnePixelOffset = aRunParams.direction * xscale;
|
|
if (xscale != 0.0) {
|
|
static const int32_t kMaxExtraStrikes = 128;
|
|
gfxFloat extraStrikes = GetSyntheticBoldOffset() / xscale;
|
|
if (extraStrikes > kMaxExtraStrikes) {
|
|
// if too many strikes are required, limit them and increase the step
|
|
// size to compensate
|
|
fontParams.extraStrikes = kMaxExtraStrikes;
|
|
fontParams.synBoldOnePixelOffset = aRunParams.direction *
|
|
GetSyntheticBoldOffset() /
|
|
fontParams.extraStrikes;
|
|
} else {
|
|
// use as many strikes as needed for the increased advance
|
|
fontParams.extraStrikes = NS_lroundf(std::max(1.0, extraStrikes));
|
|
}
|
|
}
|
|
} else {
|
|
fontParams.synBoldOnePixelOffset = 0;
|
|
fontParams.extraStrikes = 0;
|
|
}
|
|
|
|
bool oldSubpixelAA = aRunParams.dt->GetPermitSubpixelAA();
|
|
if (!AllowSubpixelAA()) {
|
|
aRunParams.dt->SetPermitSubpixelAA(false);
|
|
}
|
|
|
|
Matrix mat;
|
|
Matrix oldMat = aRunParams.dt->GetTransform();
|
|
|
|
fontParams.drawOptions.mAntialiasMode = Get2DAAMode(mAntialiasOption);
|
|
|
|
if (mStyle.baselineOffset != 0.0) {
|
|
baseline +=
|
|
mStyle.baselineOffset * aTextRun->GetAppUnitsPerDevUnit() * baselineDir;
|
|
}
|
|
|
|
bool emittedGlyphs;
|
|
{
|
|
// Select appropriate version of the templated DrawGlyphs method
|
|
// to output glyphs to the buffer, depending on complexity needed
|
|
// for the type of font, and whether added inter-glyph spacing
|
|
// is specified.
|
|
GlyphBufferAzure buffer(aRunParams, fontParams);
|
|
if (fontParams.haveSVGGlyphs || fontParams.haveColorGlyphs ||
|
|
fontParams.extraStrikes ||
|
|
(fontParams.obliqueSkew != 0.0f && fontParams.isVerticalFont &&
|
|
!textDrawer)) {
|
|
if (aRunParams.spacing) {
|
|
emittedGlyphs =
|
|
DrawGlyphs<FontComplexityT::ComplexFont, SpacingT::HasSpacing>(
|
|
aTextRun, aStart, aEnd - aStart, aPt, offsetMatrix, buffer);
|
|
} else {
|
|
emittedGlyphs =
|
|
DrawGlyphs<FontComplexityT::ComplexFont, SpacingT::NoSpacing>(
|
|
aTextRun, aStart, aEnd - aStart, aPt, offsetMatrix, buffer);
|
|
}
|
|
} else {
|
|
if (aRunParams.spacing) {
|
|
emittedGlyphs =
|
|
DrawGlyphs<FontComplexityT::SimpleFont, SpacingT::HasSpacing>(
|
|
aTextRun, aStart, aEnd - aStart, aPt, offsetMatrix, buffer);
|
|
} else {
|
|
emittedGlyphs =
|
|
DrawGlyphs<FontComplexityT::SimpleFont, SpacingT::NoSpacing>(
|
|
aTextRun, aStart, aEnd - aStart, aPt, offsetMatrix, buffer);
|
|
}
|
|
}
|
|
}
|
|
|
|
baseline = origBaseline;
|
|
|
|
if (aRunParams.callbacks && emittedGlyphs) {
|
|
aRunParams.callbacks->NotifyGlyphPathEmitted();
|
|
}
|
|
|
|
aRunParams.dt->SetTransform(oldMat);
|
|
aRunParams.dt->SetPermitSubpixelAA(oldSubpixelAA);
|
|
|
|
if (sidewaysDir != 0.0f && !textDrawer) {
|
|
// Adjust updated aPt to account for the transform we were using.
|
|
// The advance happened horizontally in local-space, but the transformed
|
|
// sideways advance is actually vertical, with sign depending on the
|
|
// direction of rotation.
|
|
float advance = aPt->x - origPt.x;
|
|
*aPt = gfx::Point(origPt.x, origPt.y + advance * sidewaysDir);
|
|
}
|
|
}
|
|
|
|
bool gfxFont::RenderSVGGlyph(gfxContext* aContext,
|
|
layout::TextDrawTarget* aTextDrawer,
|
|
gfx::Point aPoint, uint32_t aGlyphId,
|
|
SVGContextPaint* aContextPaint) const {
|
|
if (!GetFontEntry()->HasSVGGlyph(aGlyphId)) {
|
|
return false;
|
|
}
|
|
|
|
if (aTextDrawer) {
|
|
// WebRender doesn't support SVG Glyphs.
|
|
// (pretend to succeed, output doesn't matter, we will emit a blob)
|
|
aTextDrawer->FoundUnsupportedFeature();
|
|
return true;
|
|
}
|
|
|
|
const gfxFloat devUnitsPerSVGUnit =
|
|
GetAdjustedSize() / GetFontEntry()->UnitsPerEm();
|
|
gfxContextMatrixAutoSaveRestore matrixRestore(aContext);
|
|
|
|
aContext->SetMatrix(aContext->CurrentMatrix()
|
|
.PreTranslate(aPoint.x, aPoint.y)
|
|
.PreScale(devUnitsPerSVGUnit, devUnitsPerSVGUnit));
|
|
|
|
aContextPaint->InitStrokeGeometry(aContext, devUnitsPerSVGUnit);
|
|
|
|
GetFontEntry()->RenderSVGGlyph(aContext, aGlyphId, aContextPaint);
|
|
aContext->NewPath();
|
|
return true;
|
|
}
|
|
|
|
bool gfxFont::RenderSVGGlyph(gfxContext* aContext,
|
|
layout::TextDrawTarget* aTextDrawer,
|
|
gfx::Point aPoint, uint32_t aGlyphId,
|
|
SVGContextPaint* aContextPaint,
|
|
gfxTextRunDrawCallbacks* aCallbacks,
|
|
bool& aEmittedGlyphs) const {
|
|
if (aCallbacks && aEmittedGlyphs) {
|
|
aCallbacks->NotifyGlyphPathEmitted();
|
|
aEmittedGlyphs = false;
|
|
}
|
|
return RenderSVGGlyph(aContext, aTextDrawer, aPoint, aGlyphId, aContextPaint);
|
|
}
|
|
|
|
bool gfxFont::RenderColorGlyph(DrawTarget* aDrawTarget, gfxContext* aContext,
|
|
layout::TextDrawTarget* aTextDrawer,
|
|
mozilla::gfx::ScaledFont* scaledFont,
|
|
mozilla::gfx::DrawOptions aDrawOptions,
|
|
const mozilla::gfx::Point& aPoint,
|
|
uint32_t aGlyphId) const {
|
|
AutoTArray<uint16_t, 8> layerGlyphs;
|
|
AutoTArray<mozilla::gfx::DeviceColor, 8> layerColors;
|
|
|
|
mozilla::gfx::DeviceColor defaultColor;
|
|
if (!aContext->GetDeviceColor(defaultColor)) {
|
|
defaultColor = ToDeviceColor(mozilla::gfx::sRGBColor::OpaqueBlack());
|
|
}
|
|
if (!GetFontEntry()->GetColorLayersInfo(aGlyphId, defaultColor, layerGlyphs,
|
|
layerColors)) {
|
|
return false;
|
|
}
|
|
|
|
// Default to opaque rendering (non-webrender applies alpha with a layer)
|
|
float alpha = 1.0;
|
|
if (aTextDrawer) {
|
|
// defaultColor is the one that comes from CSS, so it has transparency info.
|
|
bool hasComplexTransparency = 0.f < defaultColor.a && defaultColor.a < 1.f;
|
|
if (hasComplexTransparency && layerGlyphs.Length() > 1) {
|
|
// WebRender doesn't support drawing multi-layer transparent color-glyphs,
|
|
// as it requires compositing all the layers before applying transparency.
|
|
// (pretend to succeed, output doesn't matter, we will emit a blob)
|
|
aTextDrawer->FoundUnsupportedFeature();
|
|
return true;
|
|
}
|
|
|
|
// If we get here, then either alpha is 0 or 1, or there's only one layer
|
|
// which shouldn't have composition issues. In all of these cases, applying
|
|
// transparency directly to the glyph should work perfectly fine.
|
|
//
|
|
// Note that we must still emit completely transparent emoji, because they
|
|
// might be wrapped in a shadow that uses the text run's glyphs.
|
|
alpha = defaultColor.a;
|
|
}
|
|
|
|
for (uint32_t layerIndex = 0; layerIndex < layerGlyphs.Length();
|
|
layerIndex++) {
|
|
Glyph glyph;
|
|
glyph.mIndex = layerGlyphs[layerIndex];
|
|
glyph.mPosition = aPoint;
|
|
|
|
mozilla::gfx::GlyphBuffer buffer;
|
|
buffer.mGlyphs = &glyph;
|
|
buffer.mNumGlyphs = 1;
|
|
|
|
mozilla::gfx::DeviceColor layerColor = layerColors[layerIndex];
|
|
layerColor.a *= alpha;
|
|
aDrawTarget->FillGlyphs(scaledFont, buffer, ColorPattern(layerColor),
|
|
aDrawOptions);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool gfxFont::HasColorGlyphFor(uint32_t aCh, uint32_t aNextCh) {
|
|
// Bitmap fonts are assumed to provide "color" glyphs for all supported chars.
|
|
gfxFontEntry* fe = GetFontEntry();
|
|
if (fe->HasColorBitmapTable()) {
|
|
return true;
|
|
}
|
|
// Use harfbuzz shaper to look up the default glyph ID for the character.
|
|
auto* shaper = GetHarfBuzzShaper();
|
|
if (!shaper) {
|
|
return false;
|
|
}
|
|
uint32_t gid = 0;
|
|
if (gfxFontUtils::IsVarSelector(aNextCh)) {
|
|
gid = shaper->GetVariationGlyph(aCh, aNextCh);
|
|
}
|
|
if (!gid) {
|
|
gid = shaper->GetNominalGlyph(aCh);
|
|
}
|
|
if (!gid) {
|
|
return false;
|
|
}
|
|
// Check if there is a COLR/CPAL or SVG glyph for this ID.
|
|
if (fe->TryGetColorGlyphs() && fe->HasColorLayersForGlyph(gid)) {
|
|
return true;
|
|
}
|
|
if (fe->TryGetSVGData(this) && fe->HasSVGGlyph(gid)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void UnionRange(gfxFloat aX, gfxFloat* aDestMin, gfxFloat* aDestMax) {
|
|
*aDestMin = std::min(*aDestMin, aX);
|
|
*aDestMax = std::max(*aDestMax, aX);
|
|
}
|
|
|
|
// We get precise glyph extents if the textrun creator requested them, or
|
|
// if the font is a user font --- in which case the author may be relying
|
|
// on overflowing glyphs.
|
|
static bool NeedsGlyphExtents(gfxFont* aFont, const gfxTextRun* aTextRun) {
|
|
return (aTextRun->GetFlags() &
|
|
gfx::ShapedTextFlags::TEXT_NEED_BOUNDING_BOX) ||
|
|
aFont->GetFontEntry()->IsUserFont();
|
|
}
|
|
|
|
bool gfxFont::IsSpaceGlyphInvisible(DrawTarget* aRefDrawTarget,
|
|
const gfxTextRun* aTextRun) {
|
|
if (!mFontEntry->mSpaceGlyphIsInvisibleInitialized &&
|
|
GetAdjustedSize() >= 1.0) {
|
|
gfxGlyphExtents* extents =
|
|
GetOrCreateGlyphExtents(aTextRun->GetAppUnitsPerDevUnit());
|
|
gfxRect glyphExtents;
|
|
mFontEntry->mSpaceGlyphIsInvisible =
|
|
extents->GetTightGlyphExtentsAppUnits(this, aRefDrawTarget,
|
|
GetSpaceGlyph(), &glyphExtents) &&
|
|
glyphExtents.IsEmpty();
|
|
mFontEntry->mSpaceGlyphIsInvisibleInitialized = true;
|
|
}
|
|
return mFontEntry->mSpaceGlyphIsInvisible;
|
|
}
|
|
|
|
gfxFont::RunMetrics gfxFont::Measure(const gfxTextRun* aTextRun,
|
|
uint32_t aStart, uint32_t aEnd,
|
|
BoundingBoxType aBoundingBoxType,
|
|
DrawTarget* aRefDrawTarget,
|
|
Spacing* aSpacing,
|
|
gfx::ShapedTextFlags aOrientation) {
|
|
// If aBoundingBoxType is TIGHT_HINTED_OUTLINE_EXTENTS
|
|
// and the underlying cairo font may be antialiased,
|
|
// we need to create a copy in order to avoid getting cached extents.
|
|
// This is only used by MathML layout at present.
|
|
if (aBoundingBoxType == TIGHT_HINTED_OUTLINE_EXTENTS &&
|
|
mAntialiasOption != kAntialiasNone) {
|
|
gfxFont* nonAA = mNonAAFont;
|
|
if (!nonAA) {
|
|
nonAA = CopyWithAntialiasOption(kAntialiasNone);
|
|
if (nonAA) {
|
|
if (!mNonAAFont.compareExchange(nullptr, nonAA)) {
|
|
delete nonAA;
|
|
nonAA = mNonAAFont;
|
|
}
|
|
}
|
|
}
|
|
// if font subclass doesn't implement CopyWithAntialiasOption(),
|
|
// it will return null and we'll proceed to use the existing font
|
|
if (nonAA) {
|
|
return nonAA->Measure(aTextRun, aStart, aEnd,
|
|
TIGHT_HINTED_OUTLINE_EXTENTS, aRefDrawTarget,
|
|
aSpacing, aOrientation);
|
|
}
|
|
}
|
|
|
|
const int32_t appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
|
|
// Current position in appunits
|
|
Orientation orientation =
|
|
aOrientation == gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_UPRIGHT
|
|
? nsFontMetrics::eVertical
|
|
: nsFontMetrics::eHorizontal;
|
|
const gfxFont::Metrics& fontMetrics = GetMetrics(orientation);
|
|
|
|
gfxFloat baselineOffset = 0;
|
|
if (aTextRun->UseCenterBaseline() &&
|
|
orientation == nsFontMetrics::eHorizontal) {
|
|
// For a horizontal font being used in vertical writing mode with
|
|
// text-orientation:mixed, the overall metrics we're accumulating
|
|
// will be aimed at a center baseline. But this font's metrics were
|
|
// based on the alphabetic baseline. So we compute a baseline offset
|
|
// that will be applied to ascent/descent values and glyph rects
|
|
// to effectively shift them relative to the baseline.
|
|
// XXX Eventually we should probably use the BASE table, if present.
|
|
// But it usually isn't, so we need an ad hoc adjustment for now.
|
|
baselineOffset =
|
|
appUnitsPerDevUnit * (fontMetrics.emAscent - fontMetrics.emDescent) / 2;
|
|
}
|
|
|
|
RunMetrics metrics;
|
|
metrics.mAscent = fontMetrics.maxAscent * appUnitsPerDevUnit;
|
|
metrics.mDescent = fontMetrics.maxDescent * appUnitsPerDevUnit;
|
|
|
|
if (aStart == aEnd) {
|
|
// exit now before we look at aSpacing[0], which is undefined
|
|
metrics.mAscent -= baselineOffset;
|
|
metrics.mDescent += baselineOffset;
|
|
metrics.mBoundingBox =
|
|
gfxRect(0, -metrics.mAscent, 0, metrics.mAscent + metrics.mDescent);
|
|
return metrics;
|
|
}
|
|
|
|
gfxFloat advanceMin = 0, advanceMax = 0;
|
|
const gfxTextRun::CompressedGlyph* charGlyphs =
|
|
aTextRun->GetCharacterGlyphs();
|
|
bool isRTL = aTextRun->IsRightToLeft();
|
|
bool needsGlyphExtents = NeedsGlyphExtents(this, aTextRun);
|
|
gfxGlyphExtents* extents =
|
|
((aBoundingBoxType == LOOSE_INK_EXTENTS && !needsGlyphExtents &&
|
|
!aTextRun->HasDetailedGlyphs()) ||
|
|
MOZ_UNLIKELY(GetStyle()->AdjustedSizeMustBeZero()))
|
|
? nullptr
|
|
: GetOrCreateGlyphExtents(aTextRun->GetAppUnitsPerDevUnit());
|
|
double x = 0;
|
|
if (aSpacing) {
|
|
x += aSpacing[0].mBefore;
|
|
}
|
|
uint32_t spaceGlyph = GetSpaceGlyph();
|
|
bool allGlyphsInvisible = true;
|
|
uint32_t i;
|
|
for (i = aStart; i < aEnd; ++i) {
|
|
const gfxTextRun::CompressedGlyph* glyphData = &charGlyphs[i];
|
|
if (glyphData->IsSimpleGlyph()) {
|
|
double advance = glyphData->GetSimpleAdvance();
|
|
uint32_t glyphIndex = glyphData->GetSimpleGlyph();
|
|
if (glyphIndex != spaceGlyph ||
|
|
!IsSpaceGlyphInvisible(aRefDrawTarget, aTextRun)) {
|
|
allGlyphsInvisible = false;
|
|
}
|
|
// Only get the real glyph horizontal extent if we were asked
|
|
// for the tight bounding box or we're in quality mode
|
|
if ((aBoundingBoxType != LOOSE_INK_EXTENTS || needsGlyphExtents) &&
|
|
extents) {
|
|
uint16_t extentsWidth =
|
|
extents->GetContainedGlyphWidthAppUnits(glyphIndex);
|
|
if (extentsWidth != gfxGlyphExtents::INVALID_WIDTH &&
|
|
aBoundingBoxType == LOOSE_INK_EXTENTS) {
|
|
UnionRange(x, &advanceMin, &advanceMax);
|
|
UnionRange(x + extentsWidth, &advanceMin, &advanceMax);
|
|
} else {
|
|
gfxRect glyphRect;
|
|
if (!extents->GetTightGlyphExtentsAppUnits(this, aRefDrawTarget,
|
|
glyphIndex, &glyphRect)) {
|
|
glyphRect = gfxRect(0, metrics.mBoundingBox.Y(), advance,
|
|
metrics.mBoundingBox.Height());
|
|
}
|
|
if (isRTL) {
|
|
// In effect, swap left and right sidebearings of the glyph, for
|
|
// proper accumulation of potentially-overlapping glyph rects.
|
|
glyphRect.MoveToX(advance - glyphRect.XMost());
|
|
}
|
|
glyphRect.MoveByX(x);
|
|
metrics.mBoundingBox = metrics.mBoundingBox.Union(glyphRect);
|
|
}
|
|
}
|
|
x += advance;
|
|
} else {
|
|
allGlyphsInvisible = false;
|
|
uint32_t glyphCount = glyphData->GetGlyphCount();
|
|
if (glyphCount > 0) {
|
|
const gfxTextRun::DetailedGlyph* details =
|
|
aTextRun->GetDetailedGlyphs(i);
|
|
NS_ASSERTION(details != nullptr,
|
|
"detailedGlyph record should not be missing!");
|
|
uint32_t j;
|
|
for (j = 0; j < glyphCount; ++j, ++details) {
|
|
uint32_t glyphIndex = details->mGlyphID;
|
|
double advance = details->mAdvance;
|
|
gfxRect glyphRect;
|
|
if (glyphData->IsMissing() || !extents ||
|
|
!extents->GetTightGlyphExtentsAppUnits(this, aRefDrawTarget,
|
|
glyphIndex, &glyphRect)) {
|
|
// We might have failed to get glyph extents due to
|
|
// OOM or something
|
|
glyphRect = gfxRect(0, -metrics.mAscent, advance,
|
|
metrics.mAscent + metrics.mDescent);
|
|
}
|
|
if (isRTL) {
|
|
// Swap left/right sidebearings of the glyph, because we're doing
|
|
// mirrored measurement.
|
|
glyphRect.MoveToX(advance - glyphRect.XMost());
|
|
// Move to current x position, mirroring any x-offset amount.
|
|
glyphRect.MoveByX(x - details->mOffset.x);
|
|
} else {
|
|
glyphRect.MoveByX(x + details->mOffset.x);
|
|
}
|
|
glyphRect.MoveByY(details->mOffset.y);
|
|
metrics.mBoundingBox = metrics.mBoundingBox.Union(glyphRect);
|
|
x += advance;
|
|
}
|
|
}
|
|
}
|
|
// Every other glyph type is ignored
|
|
if (aSpacing) {
|
|
double space = aSpacing[i - aStart].mAfter;
|
|
if (i + 1 < aEnd) {
|
|
space += aSpacing[i + 1 - aStart].mBefore;
|
|
}
|
|
x += space;
|
|
}
|
|
}
|
|
|
|
if (allGlyphsInvisible) {
|
|
metrics.mBoundingBox.SetEmpty();
|
|
} else {
|
|
if (aBoundingBoxType == LOOSE_INK_EXTENTS) {
|
|
UnionRange(x, &advanceMin, &advanceMax);
|
|
gfxRect fontBox(advanceMin, -metrics.mAscent, advanceMax - advanceMin,
|
|
metrics.mAscent + metrics.mDescent);
|
|
metrics.mBoundingBox = metrics.mBoundingBox.Union(fontBox);
|
|
}
|
|
}
|
|
|
|
if (isRTL) {
|
|
// Reverse the effect of having swapped each glyph's sidebearings, to get
|
|
// the correct sidebearings of the merged bounding box.
|
|
metrics.mBoundingBox.MoveToX(x - metrics.mBoundingBox.XMost());
|
|
}
|
|
|
|
// If the font may be rendered with a fake-italic effect, we need to allow
|
|
// for the top-right of the glyphs being skewed to the right, and the
|
|
// bottom-left being skewed further left.
|
|
gfxFloat skew = SkewForSyntheticOblique();
|
|
if (skew != 0.0) {
|
|
gfxFloat extendLeftEdge, extendRightEdge;
|
|
if (orientation == nsFontMetrics::eVertical) {
|
|
// The glyph will actually be skewed vertically, but "left" and "right"
|
|
// here refer to line-left (physical top) and -right (bottom), so these
|
|
// are still the directions in which we need to extend the box.
|
|
extendLeftEdge = skew < 0.0 ? ceil(-skew * metrics.mBoundingBox.XMost())
|
|
: ceil(skew * -metrics.mBoundingBox.X());
|
|
extendRightEdge = skew < 0.0 ? ceil(-skew * -metrics.mBoundingBox.X())
|
|
: ceil(skew * metrics.mBoundingBox.XMost());
|
|
} else {
|
|
extendLeftEdge = skew < 0.0 ? ceil(-skew * -metrics.mBoundingBox.Y())
|
|
: ceil(skew * metrics.mBoundingBox.YMost());
|
|
extendRightEdge = skew < 0.0 ? ceil(-skew * metrics.mBoundingBox.YMost())
|
|
: ceil(skew * -metrics.mBoundingBox.Y());
|
|
}
|
|
metrics.mBoundingBox.SetWidth(metrics.mBoundingBox.Width() +
|
|
extendLeftEdge + extendRightEdge);
|
|
metrics.mBoundingBox.MoveByX(-extendLeftEdge);
|
|
}
|
|
|
|
if (baselineOffset != 0) {
|
|
metrics.mAscent -= baselineOffset;
|
|
metrics.mDescent += baselineOffset;
|
|
metrics.mBoundingBox.MoveByY(baselineOffset);
|
|
}
|
|
|
|
metrics.mAdvanceWidth = x;
|
|
|
|
return metrics;
|
|
}
|
|
|
|
bool gfxFont::AgeCachedWords() {
|
|
mozilla::AutoWriteLock lock(mLock);
|
|
if (mWordCache) {
|
|
for (auto it = mWordCache->Iter(); !it.Done(); it.Next()) {
|
|
CacheHashEntry* entry = it.Get();
|
|
if (!entry->mShapedWord) {
|
|
NS_ASSERTION(entry->mShapedWord, "cache entry has no gfxShapedWord!");
|
|
it.Remove();
|
|
} else if (entry->mShapedWord->IncrementAge() == kShapedWordCacheMaxAge) {
|
|
it.Remove();
|
|
}
|
|
}
|
|
return mWordCache->IsEmpty();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void gfxFont::NotifyGlyphsChanged() const {
|
|
AutoReadLock lock(mLock);
|
|
uint32_t i, count = mGlyphExtentsArray.Length();
|
|
for (i = 0; i < count; ++i) {
|
|
// Flush cached extents array
|
|
mGlyphExtentsArray[i]->NotifyGlyphsChanged();
|
|
}
|
|
|
|
if (mGlyphChangeObservers) {
|
|
for (const auto& key : *mGlyphChangeObservers) {
|
|
key->NotifyGlyphsChanged();
|
|
}
|
|
}
|
|
}
|
|
|
|
// If aChar is a "word boundary" for shaped-word caching purposes, return it;
|
|
// else return 0.
|
|
static char16_t IsBoundarySpace(char16_t aChar, char16_t aNextChar) {
|
|
if ((aChar == ' ' || aChar == 0x00A0) && !IsClusterExtender(aNextChar)) {
|
|
return aChar;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef __GNUC__
|
|
# define GFX_MAYBE_UNUSED __attribute__((unused))
|
|
#else
|
|
# define GFX_MAYBE_UNUSED
|
|
#endif
|
|
|
|
template <typename T>
|
|
gfxShapedWord* gfxFont::GetShapedWord(
|
|
DrawTarget* aDrawTarget, const T* aText, uint32_t aLength, uint32_t aHash,
|
|
Script aRunScript, nsAtom* aLanguage, bool aVertical,
|
|
int32_t aAppUnitsPerDevUnit, gfx::ShapedTextFlags aFlags,
|
|
RoundingFlags aRounding, gfxTextPerfMetrics* aTextPerf GFX_MAYBE_UNUSED) {
|
|
CacheHashKey key(aText, aLength, aHash, aRunScript, aLanguage,
|
|
aAppUnitsPerDevUnit, aFlags, aRounding);
|
|
{
|
|
// If we have a word cache, attempt to look up the word in it.
|
|
AutoReadLock lock(mLock);
|
|
if (mWordCache) {
|
|
// if there's a cached entry for this word, just return it
|
|
if (CacheHashEntry* entry = mWordCache->GetEntry(key)) {
|
|
gfxShapedWord* sw = entry->mShapedWord.get();
|
|
sw->ResetAge();
|
|
#ifndef RELEASE_OR_BETA
|
|
if (aTextPerf) {
|
|
// XXX we should make sure this is atomic
|
|
aTextPerf->current.wordCacheHit++;
|
|
}
|
|
#endif
|
|
return sw;
|
|
}
|
|
}
|
|
}
|
|
|
|
// We didn't find a cached word (or don't even have a cache yet), so create
|
|
// a new gfxShapedWord and cache it. We don't have to lock during shaping,
|
|
// only when it comes time to cache the new entry.
|
|
|
|
gfxShapedWord* sw =
|
|
gfxShapedWord::Create(aText, aLength, aRunScript, aLanguage,
|
|
aAppUnitsPerDevUnit, aFlags, aRounding);
|
|
if (!sw) {
|
|
NS_WARNING("failed to create gfxShapedWord - expect missing text");
|
|
return nullptr;
|
|
}
|
|
DebugOnly<bool> ok = ShapeText(aDrawTarget, aText, 0, aLength, aRunScript,
|
|
aLanguage, aVertical, aRounding, sw);
|
|
NS_WARNING_ASSERTION(ok, "failed to shape word - expect garbled text");
|
|
|
|
{
|
|
// We're going to cache the new shaped word, so lock for writing now.
|
|
AutoWriteLock lock(mLock);
|
|
if (!mWordCache) {
|
|
mWordCache = MakeUnique<nsTHashtable<CacheHashEntry>>();
|
|
} else {
|
|
// If the cache is getting too big, flush it and start over.
|
|
uint32_t wordCacheMaxEntries =
|
|
gfxPlatform::GetPlatform()->WordCacheMaxEntries();
|
|
if (mWordCache->Count() > wordCacheMaxEntries) {
|
|
// Flush the cache if it is getting overly big.
|
|
NS_WARNING("flushing shaped-word cache");
|
|
ClearCachedWordsLocked();
|
|
}
|
|
}
|
|
CacheHashEntry* entry = mWordCache->PutEntry(key, fallible);
|
|
if (!entry) {
|
|
NS_WARNING("failed to create word cache entry - expect missing text");
|
|
delete sw;
|
|
return nullptr;
|
|
}
|
|
|
|
// It's unlikely, but maybe another thread got there before us...
|
|
if (entry->mShapedWord) {
|
|
// Just discard the newly-created word, and use the existing one.
|
|
delete sw;
|
|
sw = entry->mShapedWord.get();
|
|
sw->ResetAge();
|
|
#ifndef RELEASE_OR_BETA
|
|
if (aTextPerf) {
|
|
aTextPerf->current.wordCacheHit++;
|
|
}
|
|
#endif
|
|
return sw;
|
|
}
|
|
|
|
entry->mShapedWord.reset(sw);
|
|
|
|
#ifndef RELEASE_OR_BETA
|
|
if (aTextPerf) {
|
|
aTextPerf->current.wordCacheMiss++;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
gfxFontCache::GetCache()->RunWordCacheExpirationTimer();
|
|
|
|
return sw;
|
|
}
|
|
|
|
template gfxShapedWord* gfxFont::GetShapedWord(
|
|
DrawTarget* aDrawTarget, const uint8_t* aText, uint32_t aLength,
|
|
uint32_t aHash, Script aRunScript, nsAtom* aLanguage, bool aVertical,
|
|
int32_t aAppUnitsPerDevUnit, gfx::ShapedTextFlags aFlags,
|
|
RoundingFlags aRounding, gfxTextPerfMetrics* aTextPerf);
|
|
|
|
bool gfxFont::CacheHashEntry::KeyEquals(const KeyTypePointer aKey) const {
|
|
const gfxShapedWord* sw = mShapedWord.get();
|
|
if (!sw) {
|
|
return false;
|
|
}
|
|
if (sw->GetLength() != aKey->mLength || sw->GetFlags() != aKey->mFlags ||
|
|
sw->GetRounding() != aKey->mRounding ||
|
|
sw->GetAppUnitsPerDevUnit() != aKey->mAppUnitsPerDevUnit ||
|
|
sw->GetScript() != aKey->mScript ||
|
|
sw->GetLanguage() != aKey->mLanguage) {
|
|
return false;
|
|
}
|
|
if (sw->TextIs8Bit()) {
|
|
if (aKey->mTextIs8Bit) {
|
|
return (0 == memcmp(sw->Text8Bit(), aKey->mText.mSingle,
|
|
aKey->mLength * sizeof(uint8_t)));
|
|
}
|
|
// The key has 16-bit text, even though all the characters are < 256,
|
|
// so the TEXT_IS_8BIT flag was set and the cached ShapedWord we're
|
|
// comparing with will have 8-bit text.
|
|
const uint8_t* s1 = sw->Text8Bit();
|
|
const char16_t* s2 = aKey->mText.mDouble;
|
|
const char16_t* s2end = s2 + aKey->mLength;
|
|
while (s2 < s2end) {
|
|
if (*s1++ != *s2++) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
NS_ASSERTION(!(aKey->mFlags & gfx::ShapedTextFlags::TEXT_IS_8BIT) &&
|
|
!aKey->mTextIs8Bit,
|
|
"didn't expect 8-bit text here");
|
|
return (0 == memcmp(sw->TextUnicode(), aKey->mText.mDouble,
|
|
aKey->mLength * sizeof(char16_t)));
|
|
}
|
|
|
|
bool gfxFont::ShapeText(DrawTarget* aDrawTarget, const uint8_t* aText,
|
|
uint32_t aOffset, uint32_t aLength, Script aScript,
|
|
nsAtom* aLanguage, bool aVertical,
|
|
RoundingFlags aRounding, gfxShapedText* aShapedText) {
|
|
nsDependentCSubstring ascii((const char*)aText, aLength);
|
|
nsAutoString utf16;
|
|
AppendASCIItoUTF16(ascii, utf16);
|
|
if (utf16.Length() != aLength) {
|
|
return false;
|
|
}
|
|
return ShapeText(aDrawTarget, utf16.BeginReading(), aOffset, aLength, aScript,
|
|
aLanguage, aVertical, aRounding, aShapedText);
|
|
}
|
|
|
|
bool gfxFont::ShapeText(DrawTarget* aDrawTarget, const char16_t* aText,
|
|
uint32_t aOffset, uint32_t aLength, Script aScript,
|
|
nsAtom* aLanguage, bool aVertical,
|
|
RoundingFlags aRounding, gfxShapedText* aShapedText) {
|
|
// XXX Currently, we do all vertical shaping through harfbuzz.
|
|
// Vertical graphite support may be wanted as a future enhancement.
|
|
// XXX Graphite shaping currently only supported on the main thread!
|
|
// Worker-thread shaping (offscreen canvas) will always go via harfbuzz.
|
|
if (FontCanSupportGraphite() && !aVertical && NS_IsMainThread()) {
|
|
if (gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
|
|
gfxGraphiteShaper* shaper = mGraphiteShaper;
|
|
if (!shaper) {
|
|
shaper = new gfxGraphiteShaper(this);
|
|
if (mGraphiteShaper.compareExchange(nullptr, shaper)) {
|
|
Telemetry::ScalarAdd(Telemetry::ScalarID::BROWSER_USAGE_GRAPHITE, 1);
|
|
} else {
|
|
delete shaper;
|
|
shaper = mGraphiteShaper;
|
|
}
|
|
}
|
|
if (shaper->ShapeText(aDrawTarget, aText, aOffset, aLength, aScript,
|
|
aLanguage, aVertical, aRounding, aShapedText)) {
|
|
PostShapingFixup(aDrawTarget, aText, aOffset, aLength, aVertical,
|
|
aShapedText);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
gfxHarfBuzzShaper* shaper = GetHarfBuzzShaper();
|
|
if (shaper &&
|
|
shaper->ShapeText(aDrawTarget, aText, aOffset, aLength, aScript,
|
|
aLanguage, aVertical, aRounding, aShapedText)) {
|
|
PostShapingFixup(aDrawTarget, aText, aOffset, aLength, aVertical,
|
|
aShapedText);
|
|
if (GetFontEntry()->HasTrackingTable()) {
|
|
// Convert font size from device pixels back to CSS px
|
|
// to use in selecting tracking value
|
|
float trackSize = GetAdjustedSize() *
|
|
aShapedText->GetAppUnitsPerDevUnit() /
|
|
AppUnitsPerCSSPixel();
|
|
float tracking =
|
|
GetFontEntry()->TrackingForCSSPx(trackSize) * mFUnitsConvFactor;
|
|
// Applying tracking is a lot like the adjustment we do for
|
|
// synthetic bold: we want to apply between clusters, not to
|
|
// non-spacing glyphs within a cluster. So we can reuse that
|
|
// helper here.
|
|
aShapedText->AdjustAdvancesForSyntheticBold(tracking, aOffset, aLength);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
NS_WARNING_ASSERTION(false, "shaper failed, expect scrambled/missing text");
|
|
return false;
|
|
}
|
|
|
|
void gfxFont::PostShapingFixup(DrawTarget* aDrawTarget, const char16_t* aText,
|
|
uint32_t aOffset, uint32_t aLength,
|
|
bool aVertical, gfxShapedText* aShapedText) {
|
|
if (ApplySyntheticBold()) {
|
|
const Metrics& metrics = GetMetrics(aVertical ? nsFontMetrics::eVertical
|
|
: nsFontMetrics::eHorizontal);
|
|
if (metrics.maxAdvance > metrics.aveCharWidth) {
|
|
float synBoldOffset = GetSyntheticBoldOffset() * CalcXScale(aDrawTarget);
|
|
aShapedText->AdjustAdvancesForSyntheticBold(synBoldOffset, aOffset,
|
|
aLength);
|
|
}
|
|
}
|
|
}
|
|
|
|
#define MAX_SHAPING_LENGTH \
|
|
32760 // slightly less than 32K, trying to avoid
|
|
// over-stressing platform shapers
|
|
#define BACKTRACK_LIMIT \
|
|
16 // backtrack this far looking for a good place
|
|
// to split into fragments for separate shaping
|
|
|
|
template <typename T>
|
|
bool gfxFont::ShapeFragmentWithoutWordCache(DrawTarget* aDrawTarget,
|
|
const T* aText, uint32_t aOffset,
|
|
uint32_t aLength, Script aScript,
|
|
nsAtom* aLanguage, bool aVertical,
|
|
RoundingFlags aRounding,
|
|
gfxTextRun* aTextRun) {
|
|
aTextRun->SetupClusterBoundaries(aOffset, aText, aLength);
|
|
|
|
bool ok = true;
|
|
|
|
while (ok && aLength > 0) {
|
|
uint32_t fragLen = aLength;
|
|
|
|
// limit the length of text we pass to shapers in a single call
|
|
if (fragLen > MAX_SHAPING_LENGTH) {
|
|
fragLen = MAX_SHAPING_LENGTH;
|
|
|
|
// in the 8-bit case, there are no multi-char clusters,
|
|
// so we don't need to do this check
|
|
if constexpr (sizeof(T) == sizeof(char16_t)) {
|
|
uint32_t i;
|
|
for (i = 0; i < BACKTRACK_LIMIT; ++i) {
|
|
if (aTextRun->IsClusterStart(aOffset + fragLen - i)) {
|
|
fragLen -= i;
|
|
break;
|
|
}
|
|
}
|
|
if (i == BACKTRACK_LIMIT) {
|
|
// if we didn't find any cluster start while backtracking,
|
|
// just check that we're not in the middle of a surrogate
|
|
// pair; back up by one code unit if we are.
|
|
if (NS_IS_SURROGATE_PAIR(aText[fragLen - 1], aText[fragLen])) {
|
|
--fragLen;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ok = ShapeText(aDrawTarget, aText, aOffset, fragLen, aScript, aLanguage,
|
|
aVertical, aRounding, aTextRun);
|
|
|
|
aText += fragLen;
|
|
aOffset += fragLen;
|
|
aLength -= fragLen;
|
|
}
|
|
|
|
return ok;
|
|
}
|
|
|
|
// Check if aCh is an unhandled control character that should be displayed
|
|
// as a hexbox rather than rendered by some random font on the system.
|
|
// We exclude \r as stray s are rather common (bug 941940).
|
|
// Note that \n and \t don't come through here, as they have specific
|
|
// meanings that have already been handled.
|
|
static bool IsInvalidControlChar(uint32_t aCh) {
|
|
return aCh != '\r' && ((aCh & 0x7f) < 0x20 || aCh == 0x7f);
|
|
}
|
|
|
|
template <typename T>
|
|
bool gfxFont::ShapeTextWithoutWordCache(DrawTarget* aDrawTarget, const T* aText,
|
|
uint32_t aOffset, uint32_t aLength,
|
|
Script aScript, nsAtom* aLanguage,
|
|
bool aVertical, RoundingFlags aRounding,
|
|
gfxTextRun* aTextRun) {
|
|
uint32_t fragStart = 0;
|
|
bool ok = true;
|
|
|
|
for (uint32_t i = 0; i <= aLength && ok; ++i) {
|
|
T ch = (i < aLength) ? aText[i] : '\n';
|
|
bool invalid = gfxFontGroup::IsInvalidChar(ch);
|
|
uint32_t length = i - fragStart;
|
|
|
|
// break into separate fragments when we hit an invalid char
|
|
if (!invalid) {
|
|
continue;
|
|
}
|
|
|
|
if (length > 0) {
|
|
ok = ShapeFragmentWithoutWordCache(
|
|
aDrawTarget, aText + fragStart, aOffset + fragStart, length, aScript,
|
|
aLanguage, aVertical, aRounding, aTextRun);
|
|
}
|
|
|
|
if (i == aLength) {
|
|
break;
|
|
}
|
|
|
|
// fragment was terminated by an invalid char: skip it,
|
|
// unless it's a control char that we want to show as a hexbox,
|
|
// but record where TAB or NEWLINE occur
|
|
if (ch == '\t') {
|
|
aTextRun->SetIsTab(aOffset + i);
|
|
} else if (ch == '\n') {
|
|
aTextRun->SetIsNewline(aOffset + i);
|
|
} else if (GetGeneralCategory(ch) == HB_UNICODE_GENERAL_CATEGORY_FORMAT) {
|
|
aTextRun->SetIsFormattingControl(aOffset + i);
|
|
} else if (IsInvalidControlChar(ch) &&
|
|
!(aTextRun->GetFlags() &
|
|
gfx::ShapedTextFlags::TEXT_HIDE_CONTROL_CHARACTERS)) {
|
|
if (GetFontEntry()->IsUserFont() && HasCharacter(ch)) {
|
|
ShapeFragmentWithoutWordCache(aDrawTarget, aText + i, aOffset + i, 1,
|
|
aScript, aLanguage, aVertical, aRounding,
|
|
aTextRun);
|
|
} else {
|
|
aTextRun->SetMissingGlyph(aOffset + i, ch, this);
|
|
}
|
|
}
|
|
fragStart = i + 1;
|
|
}
|
|
|
|
NS_WARNING_ASSERTION(ok, "failed to shape text - expect garbled text");
|
|
return ok;
|
|
}
|
|
|
|
#ifndef RELEASE_OR_BETA
|
|
# define TEXT_PERF_INCR(tp, m) (tp ? (tp)->current.m++ : 0)
|
|
#else
|
|
# define TEXT_PERF_INCR(tp, m)
|
|
#endif
|
|
|
|
inline static bool IsChar8Bit(uint8_t /*aCh*/) { return true; }
|
|
inline static bool IsChar8Bit(char16_t aCh) { return aCh < 0x100; }
|
|
|
|
inline static bool HasSpaces(const uint8_t* aString, uint32_t aLen) {
|
|
return memchr(aString, 0x20, aLen) != nullptr;
|
|
}
|
|
|
|
inline static bool HasSpaces(const char16_t* aString, uint32_t aLen) {
|
|
for (const char16_t* ch = aString; ch < aString + aLen; ch++) {
|
|
if (*ch == 0x20) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
template <typename T>
|
|
bool gfxFont::SplitAndInitTextRun(
|
|
DrawTarget* aDrawTarget, gfxTextRun* aTextRun,
|
|
const T* aString, // text for this font run
|
|
uint32_t aRunStart, // position in the textrun
|
|
uint32_t aRunLength, Script aRunScript, nsAtom* aLanguage,
|
|
ShapedTextFlags aOrientation) {
|
|
if (aRunLength == 0) {
|
|
return true;
|
|
}
|
|
|
|
gfxTextPerfMetrics* tp = nullptr;
|
|
RoundingFlags rounding = GetRoundOffsetsToPixels(aDrawTarget);
|
|
|
|
#ifndef RELEASE_OR_BETA
|
|
tp = aTextRun->GetFontGroup()->GetTextPerfMetrics();
|
|
if (tp) {
|
|
if (mStyle.systemFont) {
|
|
tp->current.numChromeTextRuns++;
|
|
} else {
|
|
tp->current.numContentTextRuns++;
|
|
}
|
|
tp->current.numChars += aRunLength;
|
|
if (aRunLength > tp->current.maxTextRunLen) {
|
|
tp->current.maxTextRunLen = aRunLength;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
uint32_t wordCacheCharLimit =
|
|
gfxPlatform::GetPlatform()->WordCacheCharLimit();
|
|
|
|
bool vertical = aOrientation == ShapedTextFlags::TEXT_ORIENT_VERTICAL_UPRIGHT;
|
|
|
|
// If spaces can participate in shaping (e.g. within lookups for automatic
|
|
// fractions), need to shape without using the word cache which segments
|
|
// textruns on space boundaries. Word cache can be used if the textrun
|
|
// is short enough to fit in the word cache and it lacks spaces.
|
|
tainted_boolean_hint t_canParticipate =
|
|
SpaceMayParticipateInShaping(aRunScript);
|
|
bool canParticipate = t_canParticipate.unverified_safe_because(
|
|
"We need to ensure that this function operates safely independent of "
|
|
"t_canParticipate. The worst that can happen here is that the decision "
|
|
"to use the cache is incorrectly made, resulting in a bad "
|
|
"rendering/slowness. However, this would not compromise the memory "
|
|
"safety of Firefox in any way, and can thus be permitted");
|
|
|
|
if (canParticipate) {
|
|
if (aRunLength > wordCacheCharLimit || HasSpaces(aString, aRunLength)) {
|
|
TEXT_PERF_INCR(tp, wordCacheSpaceRules);
|
|
return ShapeTextWithoutWordCache(aDrawTarget, aString, aRunStart,
|
|
aRunLength, aRunScript, aLanguage,
|
|
vertical, rounding, aTextRun);
|
|
}
|
|
}
|
|
|
|
// the only flags we care about for ShapedWord construction/caching
|
|
gfx::ShapedTextFlags flags = aTextRun->GetFlags();
|
|
flags &= (gfx::ShapedTextFlags::TEXT_IS_RTL |
|
|
gfx::ShapedTextFlags::TEXT_DISABLE_OPTIONAL_LIGATURES |
|
|
gfx::ShapedTextFlags::TEXT_USE_MATH_SCRIPT |
|
|
gfx::ShapedTextFlags::TEXT_ORIENT_MASK);
|
|
if constexpr (sizeof(T) == sizeof(uint8_t)) {
|
|
flags |= gfx::ShapedTextFlags::TEXT_IS_8BIT;
|
|
}
|
|
|
|
uint32_t wordStart = 0;
|
|
uint32_t hash = 0;
|
|
bool wordIs8Bit = true;
|
|
int32_t appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
|
|
|
|
T nextCh = aString[0];
|
|
for (uint32_t i = 0; i <= aRunLength; ++i) {
|
|
T ch = nextCh;
|
|
nextCh = (i < aRunLength - 1) ? aString[i + 1] : '\n';
|
|
T boundary = IsBoundarySpace(ch, nextCh);
|
|
bool invalid = !boundary && gfxFontGroup::IsInvalidChar(ch);
|
|
uint32_t length = i - wordStart;
|
|
|
|
// break into separate ShapedWords when we hit an invalid char,
|
|
// or a boundary space (always handled individually),
|
|
// or the first non-space after a space
|
|
if (!boundary && !invalid) {
|
|
if (!IsChar8Bit(ch)) {
|
|
wordIs8Bit = false;
|
|
}
|
|
// include this character in the hash, and move on to next
|
|
hash = gfxShapedWord::HashMix(hash, ch);
|
|
continue;
|
|
}
|
|
|
|
// We've decided to break here (i.e. we're at the end of a "word");
|
|
// shape the word and add it to the textrun.
|
|
// For words longer than the limit, we don't use the
|
|
// font's word cache but just shape directly into the textrun.
|
|
if (length > wordCacheCharLimit) {
|
|
TEXT_PERF_INCR(tp, wordCacheLong);
|
|
bool ok = ShapeFragmentWithoutWordCache(
|
|
aDrawTarget, aString + wordStart, aRunStart + wordStart, length,
|
|
aRunScript, aLanguage, vertical, rounding, aTextRun);
|
|
if (!ok) {
|
|
return false;
|
|
}
|
|
} else if (length > 0) {
|
|
gfx::ShapedTextFlags wordFlags = flags;
|
|
// in the 8-bit version of this method, TEXT_IS_8BIT was
|
|
// already set as part of |flags|, so no need for a per-word
|
|
// adjustment here
|
|
if (sizeof(T) == sizeof(char16_t)) {
|
|
if (wordIs8Bit) {
|
|
wordFlags |= gfx::ShapedTextFlags::TEXT_IS_8BIT;
|
|
}
|
|
}
|
|
gfxShapedWord* sw = GetShapedWord(
|
|
aDrawTarget, aString + wordStart, length, hash, aRunScript, aLanguage,
|
|
vertical, appUnitsPerDevUnit, wordFlags, rounding, tp);
|
|
if (sw) {
|
|
aTextRun->CopyGlyphDataFrom(sw, aRunStart + wordStart);
|
|
} else {
|
|
return false; // failed, presumably out of memory?
|
|
}
|
|
}
|
|
|
|
if (boundary) {
|
|
// word was terminated by a space: add that to the textrun
|
|
MOZ_ASSERT(aOrientation != ShapedTextFlags::TEXT_ORIENT_VERTICAL_MIXED,
|
|
"text-orientation:mixed should be resolved earlier");
|
|
if (boundary != ' ' || !aTextRun->SetSpaceGlyphIfSimple(
|
|
this, aRunStart + i, ch, aOrientation)) {
|
|
// Currently, the only "boundary" characters we recognize are
|
|
// space and no-break space, which are both 8-bit, so we force
|
|
// that flag (below). If we ever change IsBoundarySpace, we
|
|
// may need to revise this.
|
|
// Avoid tautological-constant-out-of-range-compare in 8-bit:
|
|
DebugOnly<char16_t> boundary16 = boundary;
|
|
NS_ASSERTION(boundary16 < 256, "unexpected boundary!");
|
|
gfxShapedWord* sw = GetShapedWord(
|
|
aDrawTarget, &boundary, 1, gfxShapedWord::HashMix(0, boundary),
|
|
aRunScript, aLanguage, vertical, appUnitsPerDevUnit,
|
|
flags | gfx::ShapedTextFlags::TEXT_IS_8BIT, rounding, tp);
|
|
if (sw) {
|
|
aTextRun->CopyGlyphDataFrom(sw, aRunStart + i);
|
|
if (boundary == ' ') {
|
|
aTextRun->GetCharacterGlyphs()[aRunStart + i].SetIsSpace();
|
|
}
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
hash = 0;
|
|
wordStart = i + 1;
|
|
wordIs8Bit = true;
|
|
continue;
|
|
}
|
|
|
|
if (i == aRunLength) {
|
|
break;
|
|
}
|
|
|
|
NS_ASSERTION(invalid, "how did we get here except via an invalid char?");
|
|
|
|
// word was terminated by an invalid char: skip it,
|
|
// unless it's a control char that we want to show as a hexbox,
|
|
// but record where TAB or NEWLINE occur
|
|
if (ch == '\t') {
|
|
aTextRun->SetIsTab(aRunStart + i);
|
|
} else if (ch == '\n') {
|
|
aTextRun->SetIsNewline(aRunStart + i);
|
|
} else if (GetGeneralCategory(ch) == HB_UNICODE_GENERAL_CATEGORY_FORMAT) {
|
|
aTextRun->SetIsFormattingControl(aRunStart + i);
|
|
} else if (IsInvalidControlChar(ch) &&
|
|
!(aTextRun->GetFlags() &
|
|
gfx::ShapedTextFlags::TEXT_HIDE_CONTROL_CHARACTERS)) {
|
|
if (GetFontEntry()->IsUserFont() && HasCharacter(ch)) {
|
|
ShapeFragmentWithoutWordCache(aDrawTarget, aString + i, aRunStart + i,
|
|
1, aRunScript, aLanguage, vertical,
|
|
rounding, aTextRun);
|
|
} else {
|
|
aTextRun->SetMissingGlyph(aRunStart + i, ch, this);
|
|
}
|
|
}
|
|
|
|
hash = 0;
|
|
wordStart = i + 1;
|
|
wordIs8Bit = true;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Explicit instantiations of SplitAndInitTextRun, to avoid libxul link failure
|
|
template bool gfxFont::SplitAndInitTextRun(
|
|
DrawTarget* aDrawTarget, gfxTextRun* aTextRun, const uint8_t* aString,
|
|
uint32_t aRunStart, uint32_t aRunLength, Script aRunScript,
|
|
nsAtom* aLanguage, ShapedTextFlags aOrientation);
|
|
template bool gfxFont::SplitAndInitTextRun(
|
|
DrawTarget* aDrawTarget, gfxTextRun* aTextRun, const char16_t* aString,
|
|
uint32_t aRunStart, uint32_t aRunLength, Script aRunScript,
|
|
nsAtom* aLanguage, ShapedTextFlags aOrientation);
|
|
|
|
template <>
|
|
bool gfxFont::InitFakeSmallCapsRun(
|
|
nsPresContext* aPresContext, DrawTarget* aDrawTarget, gfxTextRun* aTextRun,
|
|
const char16_t* aText, uint32_t aOffset, uint32_t aLength,
|
|
FontMatchType aMatchType, gfx::ShapedTextFlags aOrientation, Script aScript,
|
|
nsAtom* aLanguage, bool aSyntheticLower, bool aSyntheticUpper) {
|
|
bool ok = true;
|
|
|
|
RefPtr<gfxFont> smallCapsFont = GetSmallCapsFont();
|
|
if (!smallCapsFont) {
|
|
NS_WARNING("failed to get reduced-size font for smallcaps!");
|
|
smallCapsFont = this;
|
|
}
|
|
|
|
bool isCJK = gfxTextRun::IsCJKScript(aScript);
|
|
|
|
enum RunCaseAction { kNoChange, kUppercaseReduce, kUppercase };
|
|
|
|
RunCaseAction runAction = kNoChange;
|
|
uint32_t runStart = 0;
|
|
|
|
for (uint32_t i = 0; i <= aLength; ++i) {
|
|
uint32_t extraCodeUnits = 0; // Will be set to 1 if we need to consume
|
|
// a trailing surrogate as well as the
|
|
// current code unit.
|
|
RunCaseAction chAction = kNoChange;
|
|
// Unless we're at the end, figure out what treatment the current
|
|
// character will need.
|
|
if (i < aLength) {
|
|
uint32_t ch = aText[i];
|
|
if (i < aLength - 1 && NS_IS_SURROGATE_PAIR(ch, aText[i + 1])) {
|
|
ch = SURROGATE_TO_UCS4(ch, aText[i + 1]);
|
|
extraCodeUnits = 1;
|
|
}
|
|
// Characters that aren't the start of a cluster are ignored here.
|
|
// They get added to whatever lowercase/non-lowercase run we're in.
|
|
if (IsClusterExtender(ch)) {
|
|
chAction = runAction;
|
|
} else {
|
|
if (ch != ToUpperCase(ch) || SpecialUpper(ch)) {
|
|
// ch is lower case
|
|
chAction = (aSyntheticLower ? kUppercaseReduce : kNoChange);
|
|
} else if (ch != ToLowerCase(ch)) {
|
|
// ch is upper case
|
|
chAction = (aSyntheticUpper ? kUppercaseReduce : kNoChange);
|
|
if (aLanguage == nsGkAtoms::el) {
|
|
// In Greek, check for characters that will be modified by
|
|
// the GreekUpperCase mapping - this catches accented
|
|
// capitals where the accent is to be removed (bug 307039).
|
|
// These are handled by using the full-size font with the
|
|
// uppercasing transform.
|
|
mozilla::GreekCasing::State state;
|
|
bool markEta, updateEta;
|
|
uint32_t ch2 =
|
|
mozilla::GreekCasing::UpperCase(ch, state, markEta, updateEta);
|
|
if ((ch != ch2 || markEta) && !aSyntheticUpper) {
|
|
chAction = kUppercase;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// At the end of the text or when the current character needs different
|
|
// casing treatment from the current run, finish the run-in-progress
|
|
// and prepare to accumulate a new run.
|
|
// Note that we do not look at any source data for offset [i] here,
|
|
// as that would be invalid in the case where i==length.
|
|
if ((i == aLength || runAction != chAction) && runStart < i) {
|
|
uint32_t runLength = i - runStart;
|
|
gfxFont* f = this;
|
|
switch (runAction) {
|
|
case kNoChange:
|
|
// just use the current font and the existing string
|
|
aTextRun->AddGlyphRun(f, aMatchType, aOffset + runStart, true,
|
|
aOrientation, isCJK);
|
|
if (!f->SplitAndInitTextRun(aDrawTarget, aTextRun, aText + runStart,
|
|
aOffset + runStart, runLength, aScript,
|
|
aLanguage, aOrientation)) {
|
|
ok = false;
|
|
}
|
|
break;
|
|
|
|
case kUppercaseReduce:
|
|
// use reduced-size font, then fall through to uppercase the text
|
|
f = smallCapsFont;
|
|
[[fallthrough]];
|
|
|
|
case kUppercase:
|
|
// apply uppercase transform to the string
|
|
nsDependentSubstring origString(aText + runStart, runLength);
|
|
nsAutoString convertedString;
|
|
AutoTArray<bool, 50> charsToMergeArray;
|
|
AutoTArray<bool, 50> deletedCharsArray;
|
|
|
|
StyleTextTransform globalTransform{StyleTextTransformCase::Uppercase,
|
|
{}};
|
|
bool mergeNeeded = nsCaseTransformTextRunFactory::TransformString(
|
|
origString, convertedString, Some(globalTransform),
|
|
/* aCaseTransformsOnly = */ false, aLanguage, charsToMergeArray,
|
|
deletedCharsArray);
|
|
|
|
if (mergeNeeded) {
|
|
// This is the hard case: the transformation caused chars
|
|
// to be inserted or deleted, so we can't shape directly
|
|
// into the destination textrun but have to handle the
|
|
// mismatch of character positions.
|
|
gfxTextRunFactory::Parameters params = {
|
|
aDrawTarget, nullptr, nullptr,
|
|
nullptr, 0, aTextRun->GetAppUnitsPerDevUnit()};
|
|
RefPtr<gfxTextRun> tempRun(gfxTextRun::Create(
|
|
¶ms, convertedString.Length(), aTextRun->GetFontGroup(),
|
|
gfx::ShapedTextFlags(), nsTextFrameUtils::Flags()));
|
|
tempRun->AddGlyphRun(f, aMatchType, 0, true, aOrientation, isCJK);
|
|
if (!f->SplitAndInitTextRun(aDrawTarget, tempRun.get(),
|
|
convertedString.BeginReading(), 0,
|
|
convertedString.Length(), aScript,
|
|
aLanguage, aOrientation)) {
|
|
ok = false;
|
|
} else {
|
|
RefPtr<gfxTextRun> mergedRun(gfxTextRun::Create(
|
|
¶ms, runLength, aTextRun->GetFontGroup(),
|
|
gfx::ShapedTextFlags(), nsTextFrameUtils::Flags()));
|
|
MergeCharactersInTextRun(mergedRun.get(), tempRun.get(),
|
|
charsToMergeArray.Elements(),
|
|
deletedCharsArray.Elements());
|
|
gfxTextRun::Range runRange(0, runLength);
|
|
aTextRun->CopyGlyphDataFrom(mergedRun.get(), runRange,
|
|
aOffset + runStart);
|
|
}
|
|
} else {
|
|
aTextRun->AddGlyphRun(f, aMatchType, aOffset + runStart, true,
|
|
aOrientation, isCJK);
|
|
if (!f->SplitAndInitTextRun(aDrawTarget, aTextRun,
|
|
convertedString.BeginReading(),
|
|
aOffset + runStart, runLength, aScript,
|
|
aLanguage, aOrientation)) {
|
|
ok = false;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
runStart = i;
|
|
}
|
|
|
|
i += extraCodeUnits;
|
|
if (i < aLength) {
|
|
runAction = chAction;
|
|
}
|
|
}
|
|
|
|
return ok;
|
|
}
|
|
|
|
template <>
|
|
bool gfxFont::InitFakeSmallCapsRun(
|
|
nsPresContext* aPresContext, DrawTarget* aDrawTarget, gfxTextRun* aTextRun,
|
|
const uint8_t* aText, uint32_t aOffset, uint32_t aLength,
|
|
FontMatchType aMatchType, gfx::ShapedTextFlags aOrientation, Script aScript,
|
|
nsAtom* aLanguage, bool aSyntheticLower, bool aSyntheticUpper) {
|
|
NS_ConvertASCIItoUTF16 unicodeString(reinterpret_cast<const char*>(aText),
|
|
aLength);
|
|
return InitFakeSmallCapsRun(aPresContext, aDrawTarget, aTextRun,
|
|
static_cast<const char16_t*>(unicodeString.get()),
|
|
aOffset, aLength, aMatchType, aOrientation,
|
|
aScript, aLanguage, aSyntheticLower,
|
|
aSyntheticUpper);
|
|
}
|
|
|
|
gfxFont* gfxFont::GetSmallCapsFont() const {
|
|
gfxFontStyle style(*GetStyle());
|
|
style.size *= SMALL_CAPS_SCALE_FACTOR;
|
|
style.variantCaps = NS_FONT_VARIANT_CAPS_NORMAL;
|
|
gfxFontEntry* fe = GetFontEntry();
|
|
return fe->FindOrMakeFont(&style, mUnicodeRangeMap);
|
|
}
|
|
|
|
gfxFont* gfxFont::GetSubSuperscriptFont(int32_t aAppUnitsPerDevPixel) const {
|
|
gfxFontStyle style(*GetStyle());
|
|
style.AdjustForSubSuperscript(aAppUnitsPerDevPixel);
|
|
gfxFontEntry* fe = GetFontEntry();
|
|
return fe->FindOrMakeFont(&style, mUnicodeRangeMap);
|
|
}
|
|
|
|
gfxGlyphExtents* gfxFont::GetOrCreateGlyphExtents(int32_t aAppUnitsPerDevUnit) {
|
|
{
|
|
AutoReadLock lock(mLock);
|
|
uint32_t i, count = mGlyphExtentsArray.Length();
|
|
for (i = 0; i < count; ++i) {
|
|
if (mGlyphExtentsArray[i]->GetAppUnitsPerDevUnit() == aAppUnitsPerDevUnit)
|
|
return mGlyphExtentsArray[i].get();
|
|
}
|
|
}
|
|
AutoWriteLock lock(mLock);
|
|
// Re-check in case of race.
|
|
uint32_t i, count = mGlyphExtentsArray.Length();
|
|
for (i = 0; i < count; ++i) {
|
|
if (mGlyphExtentsArray[i]->GetAppUnitsPerDevUnit() == aAppUnitsPerDevUnit)
|
|
return mGlyphExtentsArray[i].get();
|
|
}
|
|
gfxGlyphExtents* glyphExtents = new gfxGlyphExtents(aAppUnitsPerDevUnit);
|
|
if (glyphExtents) {
|
|
mGlyphExtentsArray.AppendElement(glyphExtents);
|
|
// Initialize the extents of a space glyph, assuming that spaces don't
|
|
// render anything!
|
|
glyphExtents->SetContainedGlyphWidthAppUnits(GetSpaceGlyph(), 0);
|
|
}
|
|
return glyphExtents;
|
|
}
|
|
|
|
void gfxFont::SetupGlyphExtents(DrawTarget* aDrawTarget, uint32_t aGlyphID,
|
|
bool aNeedTight, gfxGlyphExtents* aExtents) {
|
|
gfxRect svgBounds;
|
|
if (mFontEntry->TryGetSVGData(this) && mFontEntry->HasSVGGlyph(aGlyphID) &&
|
|
mFontEntry->GetSVGGlyphExtents(aDrawTarget, aGlyphID, GetAdjustedSize(),
|
|
&svgBounds)) {
|
|
gfxFloat d2a = aExtents->GetAppUnitsPerDevUnit();
|
|
aExtents->SetTightGlyphExtents(
|
|
aGlyphID, gfxRect(svgBounds.X() * d2a, svgBounds.Y() * d2a,
|
|
svgBounds.Width() * d2a, svgBounds.Height() * d2a));
|
|
return;
|
|
}
|
|
|
|
gfxRect bounds;
|
|
GetGlyphBounds(aGlyphID, &bounds, mAntialiasOption == kAntialiasNone);
|
|
|
|
const Metrics& fontMetrics = GetMetrics(nsFontMetrics::eHorizontal);
|
|
int32_t appUnitsPerDevUnit = aExtents->GetAppUnitsPerDevUnit();
|
|
if (!aNeedTight && bounds.x >= 0.0 && bounds.y >= -fontMetrics.maxAscent &&
|
|
bounds.height + bounds.y <= fontMetrics.maxDescent) {
|
|
uint32_t appUnitsWidth =
|
|
uint32_t(ceil((bounds.x + bounds.width) * appUnitsPerDevUnit));
|
|
if (appUnitsWidth < gfxGlyphExtents::INVALID_WIDTH) {
|
|
aExtents->SetContainedGlyphWidthAppUnits(aGlyphID,
|
|
uint16_t(appUnitsWidth));
|
|
return;
|
|
}
|
|
}
|
|
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
|
|
if (!aNeedTight) {
|
|
++gGlyphExtentsSetupFallBackToTight;
|
|
}
|
|
#endif
|
|
|
|
gfxFloat d2a = appUnitsPerDevUnit;
|
|
aExtents->SetTightGlyphExtents(
|
|
aGlyphID, gfxRect(bounds.x * d2a, bounds.y * d2a, bounds.width * d2a,
|
|
bounds.height * d2a));
|
|
}
|
|
|
|
// Try to initialize font metrics by reading sfnt tables directly;
|
|
// set mIsValid=TRUE and return TRUE on success.
|
|
// Return FALSE if the gfxFontEntry subclass does not
|
|
// implement GetFontTable(), or for non-sfnt fonts where tables are
|
|
// not available.
|
|
// If this returns TRUE without setting the mIsValid flag, then we -did-
|
|
// apparently find an sfnt, but it was too broken to be used.
|
|
bool gfxFont::InitMetricsFromSfntTables(Metrics& aMetrics) {
|
|
mIsValid = false; // font is NOT valid in case of early return
|
|
|
|
const uint32_t kHheaTableTag = TRUETYPE_TAG('h', 'h', 'e', 'a');
|
|
const uint32_t kOS_2TableTag = TRUETYPE_TAG('O', 'S', '/', '2');
|
|
|
|
uint32_t len;
|
|
|
|
if (mFUnitsConvFactor < 0.0) {
|
|
// If the conversion factor from FUnits is not yet set,
|
|
// get the unitsPerEm from the 'head' table via the font entry
|
|
uint16_t unitsPerEm = GetFontEntry()->UnitsPerEm();
|
|
if (unitsPerEm == gfxFontEntry::kInvalidUPEM) {
|
|
return false;
|
|
}
|
|
mFUnitsConvFactor = GetAdjustedSize() / unitsPerEm;
|
|
}
|
|
|
|
// 'hhea' table is required for the advanceWidthMax field
|
|
gfxFontEntry::AutoTable hheaTable(mFontEntry, kHheaTableTag);
|
|
if (!hheaTable) {
|
|
return false; // no 'hhea' table -> not an sfnt
|
|
}
|
|
const MetricsHeader* hhea =
|
|
reinterpret_cast<const MetricsHeader*>(hb_blob_get_data(hheaTable, &len));
|
|
if (len < sizeof(MetricsHeader)) {
|
|
return false;
|
|
}
|
|
|
|
#define SET_UNSIGNED(field, src) \
|
|
aMetrics.field = uint16_t(src) * mFUnitsConvFactor
|
|
#define SET_SIGNED(field, src) aMetrics.field = int16_t(src) * mFUnitsConvFactor
|
|
|
|
SET_UNSIGNED(maxAdvance, hhea->advanceWidthMax);
|
|
|
|
// 'OS/2' table is optional, if not found we'll estimate xHeight
|
|
// and aveCharWidth by measuring glyphs
|
|
gfxFontEntry::AutoTable os2Table(mFontEntry, kOS_2TableTag);
|
|
if (os2Table) {
|
|
const OS2Table* os2 =
|
|
reinterpret_cast<const OS2Table*>(hb_blob_get_data(os2Table, &len));
|
|
// this should always be present in any valid OS/2 of any version
|
|
if (len >= offsetof(OS2Table, xAvgCharWidth) + sizeof(int16_t)) {
|
|
SET_SIGNED(aveCharWidth, os2->xAvgCharWidth);
|
|
}
|
|
}
|
|
|
|
#undef SET_SIGNED
|
|
#undef SET_UNSIGNED
|
|
|
|
hb_font_t* hbFont = gfxHarfBuzzShaper::CreateHBFont(this);
|
|
hb_position_t position;
|
|
|
|
auto FixedToFloat = [](hb_position_t f) -> gfxFloat { return f / 65536.0; };
|
|
|
|
if (hb_ot_metrics_get_position(hbFont, HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER,
|
|
&position)) {
|
|
aMetrics.maxAscent = FixedToFloat(position);
|
|
}
|
|
if (hb_ot_metrics_get_position(hbFont, HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER,
|
|
&position)) {
|
|
aMetrics.maxDescent = -FixedToFloat(position);
|
|
}
|
|
if (hb_ot_metrics_get_position(hbFont, HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP,
|
|
&position)) {
|
|
aMetrics.externalLeading = FixedToFloat(position);
|
|
}
|
|
|
|
if (hb_ot_metrics_get_position(hbFont, HB_OT_METRICS_TAG_UNDERLINE_OFFSET,
|
|
&position)) {
|
|
aMetrics.underlineOffset = FixedToFloat(position);
|
|
}
|
|
if (hb_ot_metrics_get_position(hbFont, HB_OT_METRICS_TAG_UNDERLINE_SIZE,
|
|
&position)) {
|
|
aMetrics.underlineSize = FixedToFloat(position);
|
|
}
|
|
if (hb_ot_metrics_get_position(hbFont, HB_OT_METRICS_TAG_STRIKEOUT_OFFSET,
|
|
&position)) {
|
|
aMetrics.strikeoutOffset = FixedToFloat(position);
|
|
}
|
|
if (hb_ot_metrics_get_position(hbFont, HB_OT_METRICS_TAG_STRIKEOUT_SIZE,
|
|
&position)) {
|
|
aMetrics.strikeoutSize = FixedToFloat(position);
|
|
}
|
|
|
|
// Although sxHeight and sCapHeight are signed fields, we consider
|
|
// zero/negative values to be erroneous and just ignore them.
|
|
if (hb_ot_metrics_get_position(hbFont, HB_OT_METRICS_TAG_X_HEIGHT,
|
|
&position) &&
|
|
position > 0) {
|
|
aMetrics.xHeight = FixedToFloat(position);
|
|
}
|
|
if (hb_ot_metrics_get_position(hbFont, HB_OT_METRICS_TAG_CAP_HEIGHT,
|
|
&position) &&
|
|
position > 0) {
|
|
aMetrics.capHeight = FixedToFloat(position);
|
|
}
|
|
hb_font_destroy(hbFont);
|
|
|
|
mIsValid = true;
|
|
|
|
return true;
|
|
}
|
|
|
|
static double RoundToNearestMultiple(double aValue, double aFraction) {
|
|
return floor(aValue / aFraction + 0.5) * aFraction;
|
|
}
|
|
|
|
void gfxFont::CalculateDerivedMetrics(Metrics& aMetrics) {
|
|
aMetrics.maxAscent =
|
|
ceil(RoundToNearestMultiple(aMetrics.maxAscent, 1 / 1024.0));
|
|
aMetrics.maxDescent =
|
|
ceil(RoundToNearestMultiple(aMetrics.maxDescent, 1 / 1024.0));
|
|
|
|
if (aMetrics.xHeight <= 0) {
|
|
// only happens if we couldn't find either font metrics
|
|
// or a char to measure;
|
|
// pick an arbitrary value that's better than zero
|
|
aMetrics.xHeight = aMetrics.maxAscent * DEFAULT_XHEIGHT_FACTOR;
|
|
}
|
|
|
|
// If we have a font that doesn't provide a capHeight value, use maxAscent
|
|
// as a reasonable fallback.
|
|
if (aMetrics.capHeight <= 0) {
|
|
aMetrics.capHeight = aMetrics.maxAscent;
|
|
}
|
|
|
|
aMetrics.maxHeight = aMetrics.maxAscent + aMetrics.maxDescent;
|
|
|
|
if (aMetrics.maxHeight - aMetrics.emHeight > 0.0) {
|
|
aMetrics.internalLeading = aMetrics.maxHeight - aMetrics.emHeight;
|
|
} else {
|
|
aMetrics.internalLeading = 0.0;
|
|
}
|
|
|
|
aMetrics.emAscent =
|
|
aMetrics.maxAscent * aMetrics.emHeight / aMetrics.maxHeight;
|
|
aMetrics.emDescent = aMetrics.emHeight - aMetrics.emAscent;
|
|
|
|
if (GetFontEntry()->IsFixedPitch()) {
|
|
// Some Quartz fonts are fixed pitch, but there's some glyph with a bigger
|
|
// advance than the average character width... this forces
|
|
// those fonts to be recognized like fixed pitch fonts by layout.
|
|
aMetrics.maxAdvance = aMetrics.aveCharWidth;
|
|
}
|
|
|
|
if (!aMetrics.strikeoutOffset) {
|
|
aMetrics.strikeoutOffset = aMetrics.xHeight * 0.5;
|
|
}
|
|
if (!aMetrics.strikeoutSize) {
|
|
aMetrics.strikeoutSize = aMetrics.underlineSize;
|
|
}
|
|
}
|
|
|
|
void gfxFont::SanitizeMetrics(gfxFont::Metrics* aMetrics,
|
|
bool aIsBadUnderlineFont) {
|
|
// Even if this font size is zero, this font is created with non-zero size.
|
|
// However, for layout and others, we should return the metrics of zero size
|
|
// font.
|
|
if (mStyle.AdjustedSizeMustBeZero()) {
|
|
memset(aMetrics, 0, sizeof(gfxFont::Metrics));
|
|
return;
|
|
}
|
|
|
|
// If the font entry has ascent/descent/lineGap-override values,
|
|
// replace the metrics from the font with the overrides.
|
|
gfxFloat adjustedSize = GetAdjustedSize();
|
|
if (mFontEntry->mAscentOverride >= 0.0) {
|
|
aMetrics->maxAscent = mFontEntry->mAscentOverride * adjustedSize;
|
|
aMetrics->maxHeight = aMetrics->maxAscent + aMetrics->maxDescent;
|
|
aMetrics->internalLeading =
|
|
std::max(0.0, aMetrics->maxHeight - aMetrics->emHeight);
|
|
}
|
|
if (mFontEntry->mDescentOverride >= 0.0) {
|
|
aMetrics->maxDescent = mFontEntry->mDescentOverride * adjustedSize;
|
|
aMetrics->maxHeight = aMetrics->maxAscent + aMetrics->maxDescent;
|
|
aMetrics->internalLeading =
|
|
std::max(0.0, aMetrics->maxHeight - aMetrics->emHeight);
|
|
}
|
|
if (mFontEntry->mLineGapOverride >= 0.0) {
|
|
aMetrics->externalLeading = mFontEntry->mLineGapOverride * adjustedSize;
|
|
}
|
|
|
|
aMetrics->underlineSize = std::max(1.0, aMetrics->underlineSize);
|
|
aMetrics->strikeoutSize = std::max(1.0, aMetrics->strikeoutSize);
|
|
|
|
aMetrics->underlineOffset = std::min(aMetrics->underlineOffset, -1.0);
|
|
|
|
if (aMetrics->maxAscent < 1.0) {
|
|
// We cannot draw strikeout line and overline in the ascent...
|
|
aMetrics->underlineSize = 0;
|
|
aMetrics->underlineOffset = 0;
|
|
aMetrics->strikeoutSize = 0;
|
|
aMetrics->strikeoutOffset = 0;
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* Some CJK fonts have bad underline offset. Therefore, if this is such font,
|
|
* we need to lower the underline offset to bottom of *em* descent.
|
|
* However, if this is system font, we should not do this for the rendering
|
|
* compatibility with another application's UI on the platform.
|
|
* XXX Should not use this hack if the font size is too small?
|
|
* Such text cannot be read, this might be used for tight CSS
|
|
* rendering? (E.g., Acid2)
|
|
*/
|
|
if (!mStyle.systemFont && aIsBadUnderlineFont) {
|
|
// First, we need 2 pixels between baseline and underline at least. Because
|
|
// many CJK characters put their glyphs on the baseline, so, 1 pixel is too
|
|
// close for CJK characters.
|
|
aMetrics->underlineOffset = std::min(aMetrics->underlineOffset, -2.0);
|
|
|
|
// Next, we put the underline to bottom of below of the descent space.
|
|
if (aMetrics->internalLeading + aMetrics->externalLeading >
|
|
aMetrics->underlineSize) {
|
|
aMetrics->underlineOffset =
|
|
std::min(aMetrics->underlineOffset, -aMetrics->emDescent);
|
|
} else {
|
|
aMetrics->underlineOffset =
|
|
std::min(aMetrics->underlineOffset,
|
|
aMetrics->underlineSize - aMetrics->emDescent);
|
|
}
|
|
}
|
|
// If underline positioned is too far from the text, descent position is
|
|
// preferred so that underline will stay within the boundary.
|
|
else if (aMetrics->underlineSize - aMetrics->underlineOffset >
|
|
aMetrics->maxDescent) {
|
|
if (aMetrics->underlineSize > aMetrics->maxDescent)
|
|
aMetrics->underlineSize = std::max(aMetrics->maxDescent, 1.0);
|
|
// The max underlineOffset is 1px (the min underlineSize is 1px, and min
|
|
// maxDescent is 0px.)
|
|
aMetrics->underlineOffset = aMetrics->underlineSize - aMetrics->maxDescent;
|
|
}
|
|
|
|
// If strikeout line is overflowed from the ascent, the line should be resized
|
|
// and moved for that being in the ascent space. Note that the strikeoutOffset
|
|
// is *middle* of the strikeout line position.
|
|
gfxFloat halfOfStrikeoutSize = floor(aMetrics->strikeoutSize / 2.0 + 0.5);
|
|
if (halfOfStrikeoutSize + aMetrics->strikeoutOffset > aMetrics->maxAscent) {
|
|
if (aMetrics->strikeoutSize > aMetrics->maxAscent) {
|
|
aMetrics->strikeoutSize = std::max(aMetrics->maxAscent, 1.0);
|
|
halfOfStrikeoutSize = floor(aMetrics->strikeoutSize / 2.0 + 0.5);
|
|
}
|
|
gfxFloat ascent = floor(aMetrics->maxAscent + 0.5);
|
|
aMetrics->strikeoutOffset = std::max(halfOfStrikeoutSize, ascent / 2.0);
|
|
}
|
|
|
|
// If overline is larger than the ascent, the line should be resized.
|
|
if (aMetrics->underlineSize > aMetrics->maxAscent) {
|
|
aMetrics->underlineSize = aMetrics->maxAscent;
|
|
}
|
|
}
|
|
|
|
// Create a Metrics record to be used for vertical layout. This should never
|
|
// fail, as we've already decided this is a valid font. We do not have the
|
|
// option of marking it invalid (as can happen if we're unable to read
|
|
// horizontal metrics), because that could break a font that we're already
|
|
// using for horizontal text.
|
|
// So we will synthesize *something* usable here even if there aren't any of the
|
|
// usual font tables (which can happen in the case of a legacy bitmap or Type1
|
|
// font for which the platform-specific backend used platform APIs instead of
|
|
// sfnt tables to create the horizontal metrics).
|
|
void gfxFont::CreateVerticalMetrics() {
|
|
const uint32_t kHheaTableTag = TRUETYPE_TAG('h', 'h', 'e', 'a');
|
|
const uint32_t kVheaTableTag = TRUETYPE_TAG('v', 'h', 'e', 'a');
|
|
const uint32_t kPostTableTag = TRUETYPE_TAG('p', 'o', 's', 't');
|
|
const uint32_t kOS_2TableTag = TRUETYPE_TAG('O', 'S', '/', '2');
|
|
uint32_t len;
|
|
|
|
auto* metrics = new Metrics();
|
|
::memset(metrics, 0, sizeof(Metrics));
|
|
|
|
// Some basic defaults, in case the font lacks any real metrics tables.
|
|
// TODO: consider what rounding (if any) we should apply to these.
|
|
metrics->emHeight = GetAdjustedSize();
|
|
metrics->emAscent = metrics->emHeight / 2;
|
|
metrics->emDescent = metrics->emHeight - metrics->emAscent;
|
|
|
|
metrics->maxAscent = metrics->emAscent;
|
|
metrics->maxDescent = metrics->emDescent;
|
|
|
|
const float UNINITIALIZED_LEADING = -10000.0f;
|
|
metrics->externalLeading = UNINITIALIZED_LEADING;
|
|
|
|
if (mFUnitsConvFactor < 0.0) {
|
|
uint16_t upem = GetFontEntry()->UnitsPerEm();
|
|
if (upem != gfxFontEntry::kInvalidUPEM) {
|
|
AutoWriteLock lock(mLock);
|
|
mFUnitsConvFactor = GetAdjustedSize() / upem;
|
|
}
|
|
}
|
|
|
|
#define SET_UNSIGNED(field, src) \
|
|
metrics->field = uint16_t(src) * mFUnitsConvFactor
|
|
#define SET_SIGNED(field, src) metrics->field = int16_t(src) * mFUnitsConvFactor
|
|
|
|
gfxFontEntry::AutoTable os2Table(mFontEntry, kOS_2TableTag);
|
|
if (os2Table && mFUnitsConvFactor >= 0.0) {
|
|
const OS2Table* os2 =
|
|
reinterpret_cast<const OS2Table*>(hb_blob_get_data(os2Table, &len));
|
|
// These fields should always be present in any valid OS/2 table
|
|
if (len >= offsetof(OS2Table, sTypoLineGap) + sizeof(int16_t)) {
|
|
SET_SIGNED(strikeoutSize, os2->yStrikeoutSize);
|
|
// Use ascent+descent from the horizontal metrics as the default
|
|
// advance (aveCharWidth) in vertical mode
|
|
gfxFloat ascentDescent =
|
|
gfxFloat(mFUnitsConvFactor) *
|
|
(int16_t(os2->sTypoAscender) - int16_t(os2->sTypoDescender));
|
|
metrics->aveCharWidth = std::max(metrics->emHeight, ascentDescent);
|
|
// Use xAvgCharWidth from horizontal metrics as minimum font extent
|
|
// for vertical layout, applying half of it to ascent and half to
|
|
// descent (to work with a default centered baseline).
|
|
gfxFloat halfCharWidth =
|
|
int16_t(os2->xAvgCharWidth) * gfxFloat(mFUnitsConvFactor) / 2;
|
|
metrics->maxAscent = std::max(metrics->maxAscent, halfCharWidth);
|
|
metrics->maxDescent = std::max(metrics->maxDescent, halfCharWidth);
|
|
}
|
|
}
|
|
|
|
// If we didn't set aveCharWidth from OS/2, try to read 'hhea' metrics
|
|
// and use the line height from its ascent/descent.
|
|
if (!metrics->aveCharWidth) {
|
|
gfxFontEntry::AutoTable hheaTable(mFontEntry, kHheaTableTag);
|
|
if (hheaTable && mFUnitsConvFactor >= 0.0) {
|
|
const MetricsHeader* hhea = reinterpret_cast<const MetricsHeader*>(
|
|
hb_blob_get_data(hheaTable, &len));
|
|
if (len >= sizeof(MetricsHeader)) {
|
|
SET_SIGNED(aveCharWidth,
|
|
int16_t(hhea->ascender) - int16_t(hhea->descender));
|
|
metrics->maxAscent = metrics->aveCharWidth / 2;
|
|
metrics->maxDescent = metrics->aveCharWidth - metrics->maxAscent;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Read real vertical metrics if available.
|
|
metrics->ideographicWidth = -1.0;
|
|
gfxFontEntry::AutoTable vheaTable(mFontEntry, kVheaTableTag);
|
|
if (vheaTable && mFUnitsConvFactor >= 0.0) {
|
|
const MetricsHeader* vhea = reinterpret_cast<const MetricsHeader*>(
|
|
hb_blob_get_data(vheaTable, &len));
|
|
if (len >= sizeof(MetricsHeader)) {
|
|
SET_UNSIGNED(maxAdvance, vhea->advanceWidthMax);
|
|
// Redistribute space between ascent/descent because we want a
|
|
// centered vertical baseline by default.
|
|
gfxFloat halfExtent =
|
|
0.5 * gfxFloat(mFUnitsConvFactor) *
|
|
(int16_t(vhea->ascender) + std::abs(int16_t(vhea->descender)));
|
|
// Some bogus fonts have ascent and descent set to zero in 'vhea'.
|
|
// In that case we just ignore them and keep our synthetic values
|
|
// from above.
|
|
if (halfExtent > 0) {
|
|
metrics->maxAscent = halfExtent;
|
|
metrics->maxDescent = halfExtent;
|
|
SET_SIGNED(externalLeading, vhea->lineGap);
|
|
}
|
|
// Call gfxHarfBuzzShaper::GetGlyphVAdvance directly, as GetCharAdvance
|
|
// would potentially recurse if no v-advance is available and it attempts
|
|
// to fall back to a value from mVerticalMetrics.
|
|
if (gfxHarfBuzzShaper* shaper = GetHarfBuzzShaper()) {
|
|
uint32_t gid = ProvidesGetGlyph()
|
|
? GetGlyph(kWaterIdeograph, 0)
|
|
: shaper->GetNominalGlyph(kWaterIdeograph);
|
|
int32_t advance = shaper->GetGlyphVAdvance(gid);
|
|
metrics->ideographicWidth =
|
|
advance < 0 ? metrics->aveCharWidth : mFUnitsConvFactor * advance;
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we didn't set aveCharWidth above, we must be dealing with a non-sfnt
|
|
// font of some kind (Type1, bitmap, vector, ...), so fall back to using
|
|
// whatever the platform backend figured out for horizontal layout.
|
|
// And if we haven't set externalLeading yet, then copy that from the
|
|
// horizontal metrics as well, to help consistency of CSS line-height.
|
|
if (!metrics->aveCharWidth ||
|
|
metrics->externalLeading == UNINITIALIZED_LEADING) {
|
|
const Metrics& horizMetrics = GetHorizontalMetrics();
|
|
if (!metrics->aveCharWidth) {
|
|
metrics->aveCharWidth = horizMetrics.maxAscent + horizMetrics.maxDescent;
|
|
}
|
|
if (metrics->externalLeading == UNINITIALIZED_LEADING) {
|
|
metrics->externalLeading = horizMetrics.externalLeading;
|
|
}
|
|
}
|
|
|
|
// Get underline thickness from the 'post' table if available.
|
|
// We also read the underline position, although in vertical-upright mode
|
|
// this will not be appropriate to use directly (see nsTextFrame.cpp).
|
|
gfxFontEntry::AutoTable postTable(mFontEntry, kPostTableTag);
|
|
if (postTable) {
|
|
const PostTable* post =
|
|
reinterpret_cast<const PostTable*>(hb_blob_get_data(postTable, &len));
|
|
if (len >= offsetof(PostTable, underlineThickness) + sizeof(uint16_t)) {
|
|
static_assert(offsetof(PostTable, underlinePosition) <
|
|
offsetof(PostTable, underlineThickness),
|
|
"broken PostTable struct?");
|
|
SET_SIGNED(underlineOffset, post->underlinePosition);
|
|
SET_UNSIGNED(underlineSize, post->underlineThickness);
|
|
// Also use for strikeout if we didn't find that in OS/2 above.
|
|
if (!metrics->strikeoutSize) {
|
|
metrics->strikeoutSize = metrics->underlineSize;
|
|
}
|
|
}
|
|
}
|
|
|
|
#undef SET_UNSIGNED
|
|
#undef SET_SIGNED
|
|
|
|
// If we didn't read this from a vhea table, it will still be zero.
|
|
// In any case, let's make sure it is not less than the value we've
|
|
// come up with for aveCharWidth.
|
|
metrics->maxAdvance = std::max(metrics->maxAdvance, metrics->aveCharWidth);
|
|
|
|
// Thickness of underline and strikeout may have been read from tables,
|
|
// but in case they were not present, ensure a minimum of 1 pixel.
|
|
metrics->underlineSize = std::max(1.0, metrics->underlineSize);
|
|
|
|
metrics->strikeoutSize = std::max(1.0, metrics->strikeoutSize);
|
|
metrics->strikeoutOffset = -0.5 * metrics->strikeoutSize;
|
|
|
|
// Somewhat arbitrary values for now, subject to future refinement...
|
|
metrics->spaceWidth = metrics->aveCharWidth;
|
|
metrics->zeroWidth = metrics->aveCharWidth;
|
|
metrics->maxHeight = metrics->maxAscent + metrics->maxDescent;
|
|
metrics->xHeight = metrics->emHeight / 2;
|
|
metrics->capHeight = metrics->maxAscent;
|
|
|
|
if (!mVerticalMetrics.compareExchange(nullptr, metrics)) {
|
|
delete metrics;
|
|
}
|
|
}
|
|
|
|
gfxFloat gfxFont::SynthesizeSpaceWidth(uint32_t aCh) {
|
|
// return an appropriate width for various Unicode space characters
|
|
// that we "fake" if they're not actually present in the font;
|
|
// returns negative value if the char is not a known space.
|
|
switch (aCh) {
|
|
case 0x2000: // en quad
|
|
case 0x2002:
|
|
return GetAdjustedSize() / 2; // en space
|
|
case 0x2001: // em quad
|
|
case 0x2003:
|
|
return GetAdjustedSize(); // em space
|
|
case 0x2004:
|
|
return GetAdjustedSize() / 3; // three-per-em space
|
|
case 0x2005:
|
|
return GetAdjustedSize() / 4; // four-per-em space
|
|
case 0x2006:
|
|
return GetAdjustedSize() / 6; // six-per-em space
|
|
case 0x2007:
|
|
return GetMetrics(nsFontMetrics::eHorizontal)
|
|
.ZeroOrAveCharWidth(); // figure space
|
|
case 0x2008:
|
|
return GetMetrics(nsFontMetrics::eHorizontal)
|
|
.spaceWidth; // punctuation space
|
|
case 0x2009:
|
|
return GetAdjustedSize() / 5; // thin space
|
|
case 0x200a:
|
|
return GetAdjustedSize() / 10; // hair space
|
|
case 0x202f:
|
|
return GetAdjustedSize() / 5; // narrow no-break space
|
|
case 0x3000:
|
|
return GetAdjustedSize(); // ideographic space
|
|
default:
|
|
return -1.0;
|
|
}
|
|
}
|
|
|
|
void gfxFont::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
|
|
FontCacheSizes* aSizes) const {
|
|
AutoReadLock lock(mLock);
|
|
for (uint32_t i = 0; i < mGlyphExtentsArray.Length(); ++i) {
|
|
aSizes->mFontInstances +=
|
|
mGlyphExtentsArray[i]->SizeOfIncludingThis(aMallocSizeOf);
|
|
}
|
|
if (mWordCache) {
|
|
aSizes->mShapedWords += mWordCache->SizeOfIncludingThis(aMallocSizeOf);
|
|
}
|
|
}
|
|
|
|
void gfxFont::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
|
|
FontCacheSizes* aSizes) const {
|
|
aSizes->mFontInstances += aMallocSizeOf(this);
|
|
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
|
|
}
|
|
|
|
void gfxFont::AddGlyphChangeObserver(GlyphChangeObserver* aObserver) {
|
|
AutoWriteLock lock(mLock);
|
|
if (!mGlyphChangeObservers) {
|
|
mGlyphChangeObservers = MakeUnique<nsTHashSet<GlyphChangeObserver*>>();
|
|
}
|
|
mGlyphChangeObservers->Insert(aObserver);
|
|
}
|
|
|
|
void gfxFont::RemoveGlyphChangeObserver(GlyphChangeObserver* aObserver) {
|
|
AutoWriteLock lock(mLock);
|
|
NS_ASSERTION(mGlyphChangeObservers, "No observers registered");
|
|
NS_ASSERTION(mGlyphChangeObservers->Contains(aObserver),
|
|
"Observer not registered");
|
|
mGlyphChangeObservers->Remove(aObserver);
|
|
}
|
|
|
|
#define DEFAULT_PIXEL_FONT_SIZE 16.0f
|
|
|
|
gfxFontStyle::gfxFontStyle()
|
|
: size(DEFAULT_PIXEL_FONT_SIZE),
|
|
sizeAdjust(0.0f),
|
|
baselineOffset(0.0f),
|
|
languageOverride(NO_FONT_LANGUAGE_OVERRIDE),
|
|
fontSmoothingBackgroundColor(NS_RGBA(0, 0, 0, 0)),
|
|
weight(FontWeight::NORMAL),
|
|
stretch(FontStretch::NORMAL),
|
|
style(FontSlantStyle::NORMAL),
|
|
variantCaps(NS_FONT_VARIANT_CAPS_NORMAL),
|
|
variantSubSuper(NS_FONT_VARIANT_POSITION_NORMAL),
|
|
sizeAdjustBasis(uint8_t(FontSizeAdjust::Tag::None)),
|
|
systemFont(true),
|
|
printerFont(false),
|
|
useGrayscaleAntialiasing(false),
|
|
allowSyntheticWeight(true),
|
|
allowSyntheticStyle(true),
|
|
allowSyntheticSmallCaps(true),
|
|
noFallbackVariantFeatures(true) {}
|
|
|
|
gfxFontStyle::gfxFontStyle(FontSlantStyle aStyle, FontWeight aWeight,
|
|
FontStretch aStretch, gfxFloat aSize,
|
|
const FontSizeAdjust& aSizeAdjust, bool aSystemFont,
|
|
bool aPrinterFont, bool aAllowWeightSynthesis,
|
|
bool aAllowStyleSynthesis,
|
|
bool aAllowSmallCapsSynthesis,
|
|
uint32_t aLanguageOverride)
|
|
: size(aSize),
|
|
baselineOffset(0.0f),
|
|
languageOverride(aLanguageOverride),
|
|
fontSmoothingBackgroundColor(NS_RGBA(0, 0, 0, 0)),
|
|
weight(aWeight),
|
|
stretch(aStretch),
|
|
style(aStyle),
|
|
variantCaps(NS_FONT_VARIANT_CAPS_NORMAL),
|
|
variantSubSuper(NS_FONT_VARIANT_POSITION_NORMAL),
|
|
systemFont(aSystemFont),
|
|
printerFont(aPrinterFont),
|
|
useGrayscaleAntialiasing(false),
|
|
allowSyntheticWeight(aAllowWeightSynthesis),
|
|
allowSyntheticStyle(aAllowStyleSynthesis),
|
|
allowSyntheticSmallCaps(aAllowSmallCapsSynthesis),
|
|
noFallbackVariantFeatures(true) {
|
|
MOZ_ASSERT(!mozilla::IsNaN(size));
|
|
|
|
switch (aSizeAdjust.tag) {
|
|
case FontSizeAdjust::Tag::None:
|
|
sizeAdjust = 0.0f;
|
|
break;
|
|
case FontSizeAdjust::Tag::ExHeight:
|
|
sizeAdjust = aSizeAdjust.AsExHeight();
|
|
break;
|
|
case FontSizeAdjust::Tag::CapHeight:
|
|
sizeAdjust = aSizeAdjust.AsCapHeight();
|
|
break;
|
|
case FontSizeAdjust::Tag::ChWidth:
|
|
sizeAdjust = aSizeAdjust.AsChWidth();
|
|
break;
|
|
case FontSizeAdjust::Tag::IcWidth:
|
|
sizeAdjust = aSizeAdjust.AsIcWidth();
|
|
break;
|
|
case FontSizeAdjust::Tag::IcHeight:
|
|
sizeAdjust = aSizeAdjust.AsIcHeight();
|
|
break;
|
|
}
|
|
MOZ_ASSERT(!mozilla::IsNaN(sizeAdjust));
|
|
|
|
sizeAdjustBasis = uint8_t(aSizeAdjust.tag);
|
|
// sizeAdjustBasis is currently a small bitfield, so let's assert that the
|
|
// tag value was not truncated.
|
|
MOZ_ASSERT(FontSizeAdjust::Tag(sizeAdjustBasis) == aSizeAdjust.tag,
|
|
"gfxFontStyle.sizeAdjustBasis too small?");
|
|
|
|
if (weight > FontWeight::FromInt(1000)) {
|
|
weight = FontWeight::FromInt(1000);
|
|
}
|
|
if (weight < FontWeight::FromInt(1)) {
|
|
weight = FontWeight::FromInt(1);
|
|
}
|
|
|
|
if (size >= FONT_MAX_SIZE) {
|
|
size = FONT_MAX_SIZE;
|
|
sizeAdjust = 0.0f;
|
|
sizeAdjustBasis = uint8_t(FontSizeAdjust::Tag::None);
|
|
} else if (size < 0.0) {
|
|
NS_WARNING("negative font size");
|
|
size = 0.0;
|
|
}
|
|
}
|
|
|
|
PLDHashNumber gfxFontStyle::Hash() const {
|
|
uint32_t hash = variationSettings.IsEmpty()
|
|
? 0
|
|
: mozilla::HashBytes(variationSettings.Elements(),
|
|
variationSettings.Length() *
|
|
sizeof(gfxFontVariation));
|
|
return mozilla::AddToHash(hash, systemFont, style.Raw(), stretch.Raw(),
|
|
weight.Raw(), size, int32_t(sizeAdjust * 1000.0f));
|
|
}
|
|
|
|
void gfxFontStyle::AdjustForSubSuperscript(int32_t aAppUnitsPerDevPixel) {
|
|
MOZ_ASSERT(
|
|
variantSubSuper != NS_FONT_VARIANT_POSITION_NORMAL && baselineOffset == 0,
|
|
"can't adjust this style for sub/superscript");
|
|
|
|
// calculate the baseline offset (before changing the size)
|
|
if (variantSubSuper == NS_FONT_VARIANT_POSITION_SUPER) {
|
|
baselineOffset = size * -NS_FONT_SUPERSCRIPT_OFFSET_RATIO;
|
|
} else {
|
|
baselineOffset = size * NS_FONT_SUBSCRIPT_OFFSET_RATIO;
|
|
}
|
|
|
|
// calculate reduced size, roughly mimicing behavior of font-size: smaller
|
|
float cssSize = size * aAppUnitsPerDevPixel / AppUnitsPerCSSPixel();
|
|
if (cssSize < NS_FONT_SUB_SUPER_SMALL_SIZE) {
|
|
size *= NS_FONT_SUB_SUPER_SIZE_RATIO_SMALL;
|
|
} else if (cssSize >= NS_FONT_SUB_SUPER_LARGE_SIZE) {
|
|
size *= NS_FONT_SUB_SUPER_SIZE_RATIO_LARGE;
|
|
} else {
|
|
gfxFloat t = (cssSize - NS_FONT_SUB_SUPER_SMALL_SIZE) /
|
|
(NS_FONT_SUB_SUPER_LARGE_SIZE - NS_FONT_SUB_SUPER_SMALL_SIZE);
|
|
size *= (1.0 - t) * NS_FONT_SUB_SUPER_SIZE_RATIO_SMALL +
|
|
t * NS_FONT_SUB_SUPER_SIZE_RATIO_LARGE;
|
|
}
|
|
|
|
// clear the variant field
|
|
variantSubSuper = NS_FONT_VARIANT_POSITION_NORMAL;
|
|
}
|
|
|
|
bool gfxFont::TryGetMathTable() {
|
|
if (mMathInitialized) {
|
|
return !!mMathTable;
|
|
}
|
|
|
|
hb_face_t* face = GetFontEntry()->GetHBFace();
|
|
if (face) {
|
|
if (hb_ot_math_has_data(face)) {
|
|
auto* mathTable = new gfxMathTable(face, GetAdjustedSize());
|
|
if (!mMathTable.compareExchange(nullptr, mathTable)) {
|
|
delete mathTable;
|
|
}
|
|
}
|
|
hb_face_destroy(face);
|
|
}
|
|
mMathInitialized = true;
|
|
|
|
return !!mMathTable;
|
|
}
|