mirror of
https://github.com/mozilla/gecko-dev.git
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1872 lines
68 KiB
C++
1872 lines
68 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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 "nsString.h"
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#include "gfxContext.h"
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#include "gfxFontConstants.h"
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#include "gfxHarfBuzzShaper.h"
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#include "gfxFontUtils.h"
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#include "gfxTextRun.h"
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#include "mozilla/Snprintf.h"
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#include "nsUnicodeProperties.h"
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#include "nsUnicodeScriptCodes.h"
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#include "nsUnicodeNormalizer.h"
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#include "harfbuzz/hb.h"
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#include "harfbuzz/hb-ot.h"
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#if ENABLE_INTL_API // ICU is available: we'll use it for Unicode composition
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// and decomposition in preference to nsUnicodeNormalizer.
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#include "unicode/unorm.h"
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#include "unicode/utext.h"
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#define MOZ_HB_SHAPER_USE_ICU_NORMALIZATION 1
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static const UNormalizer2 * sNormalizer = nullptr;
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#else
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#undef MOZ_HB_SHAPER_USE_ICU_NORMALIZATION
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#endif
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#include <algorithm>
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#define FloatToFixed(f) (65536 * (f))
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#define FixedToFloat(f) ((f) * (1.0 / 65536.0))
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// Right shifts of negative (signed) integers are undefined, as are overflows
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// when converting unsigned to negative signed integers.
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// (If speed were an issue we could make some 2's complement assumptions.)
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#define FixedToIntRound(f) ((f) > 0 ? ((32768 + (f)) >> 16) \
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: -((32767 - (f)) >> 16))
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using namespace mozilla; // for AutoSwap_* types
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using namespace mozilla::unicode; // for Unicode property lookup
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/*
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* Creation and destruction; on deletion, release any font tables we're holding
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*/
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gfxHarfBuzzShaper::gfxHarfBuzzShaper(gfxFont *aFont)
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: gfxFontShaper(aFont),
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mHBFace(aFont->GetFontEntry()->GetHBFace()),
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mHBFont(nullptr),
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mKernTable(nullptr),
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mHmtxTable(nullptr),
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mVmtxTable(nullptr),
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mVORGTable(nullptr),
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mLocaTable(nullptr),
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mGlyfTable(nullptr),
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mCmapTable(nullptr),
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mCmapFormat(-1),
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mSubtableOffset(0),
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mUVSTableOffset(0),
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mNumLongHMetrics(0),
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mNumLongVMetrics(0),
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mUseFontGetGlyph(aFont->ProvidesGetGlyph()),
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mUseFontGlyphWidths(false),
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mInitialized(false),
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mVerticalInitialized(false),
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mLoadedLocaGlyf(false),
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mLocaLongOffsets(false)
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{
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}
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gfxHarfBuzzShaper::~gfxHarfBuzzShaper()
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{
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if (mCmapTable) {
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hb_blob_destroy(mCmapTable);
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}
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if (mHmtxTable) {
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hb_blob_destroy(mHmtxTable);
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}
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if (mKernTable) {
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hb_blob_destroy(mKernTable);
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}
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if (mVmtxTable) {
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hb_blob_destroy(mVmtxTable);
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}
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if (mVORGTable) {
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hb_blob_destroy(mVORGTable);
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}
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if (mLocaTable) {
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hb_blob_destroy(mLocaTable);
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}
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if (mGlyfTable) {
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hb_blob_destroy(mGlyfTable);
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}
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if (mHBFont) {
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hb_font_destroy(mHBFont);
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}
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if (mHBFace) {
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hb_face_destroy(mHBFace);
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}
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}
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#define UNICODE_BMP_LIMIT 0x10000
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hb_codepoint_t
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gfxHarfBuzzShaper::GetGlyph(hb_codepoint_t unicode,
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hb_codepoint_t variation_selector) const
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{
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hb_codepoint_t gid = 0;
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if (mUseFontGetGlyph) {
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gid = mFont->GetGlyph(unicode, variation_selector);
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} else {
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// we only instantiate a harfbuzz shaper if there's a cmap available
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NS_ASSERTION(mFont->GetFontEntry()->HasCmapTable(),
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"we cannot be using this font!");
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NS_ASSERTION(mCmapTable && (mCmapFormat > 0) && (mSubtableOffset > 0),
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"cmap data not correctly set up, expect disaster");
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const uint8_t* data =
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(const uint8_t*)hb_blob_get_data(mCmapTable, nullptr);
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if (variation_selector) {
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if (mUVSTableOffset) {
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gid =
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gfxFontUtils::MapUVSToGlyphFormat14(data + mUVSTableOffset,
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unicode,
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variation_selector);
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}
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if (!gid) {
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uint32_t compat =
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gfxFontUtils::GetUVSFallback(unicode, variation_selector);
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if (compat) {
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switch (mCmapFormat) {
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case 4:
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if (compat < UNICODE_BMP_LIMIT) {
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gid = gfxFontUtils::MapCharToGlyphFormat4(data + mSubtableOffset,
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compat);
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}
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break;
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case 10:
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gid = gfxFontUtils::MapCharToGlyphFormat10(data + mSubtableOffset,
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compat);
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break;
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case 12:
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gid = gfxFontUtils::MapCharToGlyphFormat12(data + mSubtableOffset,
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compat);
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break;
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}
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}
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}
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// If the variation sequence was not supported, return zero here;
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// harfbuzz will call us again for the base character alone
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return gid;
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}
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switch (mCmapFormat) {
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case 4:
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gid = unicode < UNICODE_BMP_LIMIT ?
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gfxFontUtils::MapCharToGlyphFormat4(data + mSubtableOffset,
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unicode) : 0;
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break;
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case 10:
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gid = gfxFontUtils::MapCharToGlyphFormat10(data + mSubtableOffset,
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unicode);
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break;
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case 12:
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gid = gfxFontUtils::MapCharToGlyphFormat12(data + mSubtableOffset,
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unicode);
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break;
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default:
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NS_WARNING("unsupported cmap format, glyphs will be missing");
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break;
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}
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}
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if (!gid) {
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// if there's no glyph for , just use the space glyph instead
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if (unicode == 0xA0) {
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gid = mFont->GetSpaceGlyph();
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}
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}
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return gid;
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}
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static int
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VertFormsGlyphCompare(const void* aKey, const void* aElem)
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{
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return int(*((hb_codepoint_t*)(aKey))) - int(*((uint16_t*)(aElem)));
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}
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// Return a vertical presentation-form codepoint corresponding to the
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// given Unicode value, or 0 if no such form is available.
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static hb_codepoint_t
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GetVerticalPresentationForm(hb_codepoint_t unicode)
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{
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static const uint16_t sVerticalForms[][2] = {
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{ 0x2013, 0xfe32 }, // EN DASH
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{ 0x2014, 0xfe31 }, // EM DASH
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{ 0x2025, 0xfe30 }, // TWO DOT LEADER
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{ 0x2026, 0xfe19 }, // HORIZONTAL ELLIPSIS
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{ 0x3001, 0xfe11 }, // IDEOGRAPHIC COMMA
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{ 0x3002, 0xfe12 }, // IDEOGRAPHIC FULL STOP
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{ 0x3008, 0xfe3f }, // LEFT ANGLE BRACKET
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{ 0x3009, 0xfe40 }, // RIGHT ANGLE BRACKET
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{ 0x300a, 0xfe3d }, // LEFT DOUBLE ANGLE BRACKET
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{ 0x300b, 0xfe3e }, // RIGHT DOUBLE ANGLE BRACKET
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{ 0x300c, 0xfe41 }, // LEFT CORNER BRACKET
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{ 0x300d, 0xfe42 }, // RIGHT CORNER BRACKET
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{ 0x300e, 0xfe43 }, // LEFT WHITE CORNER BRACKET
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{ 0x300f, 0xfe44 }, // RIGHT WHITE CORNER BRACKET
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{ 0x3010, 0xfe3b }, // LEFT BLACK LENTICULAR BRACKET
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{ 0x3011, 0xfe3c }, // RIGHT BLACK LENTICULAR BRACKET
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{ 0x3014, 0xfe39 }, // LEFT TORTOISE SHELL BRACKET
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{ 0x3015, 0xfe3a }, // RIGHT TORTOISE SHELL BRACKET
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{ 0x3016, 0xfe17 }, // LEFT WHITE LENTICULAR BRACKET
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{ 0x3017, 0xfe18 }, // RIGHT WHITE LENTICULAR BRACKET
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{ 0xfe4f, 0xfe34 }, // WAVY LOW LINE
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{ 0xff01, 0xfe15 }, // FULLWIDTH EXCLAMATION MARK
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{ 0xff08, 0xfe35 }, // FULLWIDTH LEFT PARENTHESIS
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{ 0xff09, 0xfe36 }, // FULLWIDTH RIGHT PARENTHESIS
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{ 0xff0c, 0xfe10 }, // FULLWIDTH COMMA
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{ 0xff1a, 0xfe13 }, // FULLWIDTH COLON
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{ 0xff1b, 0xfe14 }, // FULLWIDTH SEMICOLON
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{ 0xff1f, 0xfe16 }, // FULLWIDTH QUESTION MARK
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{ 0xff3b, 0xfe47 }, // FULLWIDTH LEFT SQUARE BRACKET
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{ 0xff3d, 0xfe48 }, // FULLWIDTH RIGHT SQUARE BRACKET
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{ 0xff3f, 0xfe33 }, // FULLWIDTH LOW LINE
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{ 0xff5b, 0xfe37 }, // FULLWIDTH LEFT CURLY BRACKET
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{ 0xff5d, 0xfe38 } // FULLWIDTH RIGHT CURLY BRACKET
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};
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const uint16_t* charPair =
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static_cast<const uint16_t*>(bsearch(&unicode,
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sVerticalForms,
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ArrayLength(sVerticalForms),
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sizeof(sVerticalForms[0]),
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VertFormsGlyphCompare));
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return charPair ? charPair[1] : 0;
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}
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static hb_bool_t
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HBGetGlyph(hb_font_t *font, void *font_data,
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hb_codepoint_t unicode, hb_codepoint_t variation_selector,
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hb_codepoint_t *glyph,
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void *user_data)
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{
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const gfxHarfBuzzShaper::FontCallbackData *fcd =
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static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
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if (fcd->mShaper->UseVerticalPresentationForms()) {
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hb_codepoint_t verticalForm = GetVerticalPresentationForm(unicode);
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if (verticalForm) {
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*glyph = fcd->mShaper->GetGlyph(verticalForm, variation_selector);
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if (*glyph != 0) {
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return true;
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}
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}
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// fall back to the non-vertical form if we didn't find an alternate
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}
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*glyph = fcd->mShaper->GetGlyph(unicode, variation_selector);
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return *glyph != 0;
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}
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// Glyph metrics structures, shared (with appropriate reinterpretation of
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// field names) by horizontal and vertical metrics tables.
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struct LongMetric {
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AutoSwap_PRUint16 advanceWidth; // or advanceHeight, when vertical
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AutoSwap_PRInt16 lsb; // or tsb, when vertical
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};
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struct GlyphMetrics {
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LongMetric metrics[1]; // actually numberOfLongMetrics
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// the variable-length metrics[] array is immediately followed by:
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// AutoSwap_PRUint16 leftSideBearing[];
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};
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hb_position_t
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gfxHarfBuzzShaper::GetGlyphHAdvance(hb_codepoint_t glyph) const
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{
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// font did not implement GetGlyphWidth, so get an unhinted value
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// directly from the font tables
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NS_ASSERTION((mNumLongHMetrics > 0) && mHmtxTable != nullptr,
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"font is lacking metrics, we shouldn't be here");
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if (glyph >= uint32_t(mNumLongHMetrics)) {
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glyph = mNumLongHMetrics - 1;
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}
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// glyph must be valid now, because we checked during initialization
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// that mNumLongHMetrics is > 0, and that the metrics table is large enough
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// to contain mNumLongHMetrics records
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const GlyphMetrics* metrics =
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reinterpret_cast<const GlyphMetrics*>(hb_blob_get_data(mHmtxTable,
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nullptr));
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return FloatToFixed(mFont->FUnitsToDevUnitsFactor() *
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uint16_t(metrics->metrics[glyph].advanceWidth));
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}
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hb_position_t
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gfxHarfBuzzShaper::GetGlyphVAdvance(hb_codepoint_t glyph) const
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{
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if (!mVmtxTable) {
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// Must be a "vertical" font that doesn't actually have vertical metrics;
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// use a fixed advance.
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return FloatToFixed(mFont->GetMetrics(gfxFont::eVertical).aveCharWidth);
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}
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NS_ASSERTION(mNumLongVMetrics > 0,
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"font is lacking metrics, we shouldn't be here");
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if (glyph >= uint32_t(mNumLongVMetrics)) {
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glyph = mNumLongVMetrics - 1;
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}
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// glyph must be valid now, because we checked during initialization
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// that mNumLongVMetrics is > 0, and that the metrics table is large enough
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// to contain mNumLongVMetrics records
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const GlyphMetrics* metrics =
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reinterpret_cast<const GlyphMetrics*>(hb_blob_get_data(mVmtxTable,
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nullptr));
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return FloatToFixed(mFont->FUnitsToDevUnitsFactor() *
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uint16_t(metrics->metrics[glyph].advanceWidth));
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}
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/* static */
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hb_position_t
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gfxHarfBuzzShaper::HBGetGlyphHAdvance(hb_font_t *font, void *font_data,
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hb_codepoint_t glyph, void *user_data)
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{
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const gfxHarfBuzzShaper::FontCallbackData *fcd =
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static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
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gfxFont *gfxfont = fcd->mShaper->GetFont();
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if (gfxfont->ProvidesGlyphWidths()) {
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return gfxfont->GetGlyphWidth(*fcd->mContext->GetDrawTarget(), glyph);
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}
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return fcd->mShaper->GetGlyphHAdvance(glyph);
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}
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/* static */
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hb_position_t
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gfxHarfBuzzShaper::HBGetGlyphVAdvance(hb_font_t *font, void *font_data,
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hb_codepoint_t glyph, void *user_data)
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{
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const gfxHarfBuzzShaper::FontCallbackData *fcd =
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static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
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// Currently, we don't offer gfxFont subclasses a method to override this
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// and provide hinted platform-specific vertical advances (analogous to the
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// GetGlyphWidth method for horizontal advances). If that proves necessary,
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// we'll add a new gfxFont method and call it from here.
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return fcd->mShaper->GetGlyphVAdvance(glyph);
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}
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/* static */
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hb_bool_t
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gfxHarfBuzzShaper::HBGetGlyphHOrigin(hb_font_t *font, void *font_data,
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hb_codepoint_t glyph,
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hb_position_t *x, hb_position_t *y,
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void *user_data)
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{
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// We work in horizontal coordinates, so no origin adjustment needed here.
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return true;
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}
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struct VORG {
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AutoSwap_PRUint16 majorVersion;
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AutoSwap_PRUint16 minorVersion;
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AutoSwap_PRInt16 defaultVertOriginY;
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AutoSwap_PRUint16 numVertOriginYMetrics;
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};
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struct VORGrec {
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AutoSwap_PRUint16 glyphIndex;
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AutoSwap_PRInt16 vertOriginY;
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};
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/* static */
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hb_bool_t
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gfxHarfBuzzShaper::HBGetGlyphVOrigin(hb_font_t *font, void *font_data,
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hb_codepoint_t glyph,
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hb_position_t *x, hb_position_t *y,
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void *user_data)
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{
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const gfxHarfBuzzShaper::FontCallbackData *fcd =
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static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
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fcd->mShaper->GetGlyphVOrigin(glyph, x, y);
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return true;
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}
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void
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gfxHarfBuzzShaper::GetGlyphVOrigin(hb_codepoint_t aGlyph,
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hb_position_t *aX, hb_position_t *aY) const
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{
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*aX = -0.5 * GetGlyphHAdvance(aGlyph);
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if (mVORGTable) {
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// We checked in Initialize() that the VORG table is safely readable,
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// so no length/bounds-check needed here.
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const VORG* vorg =
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reinterpret_cast<const VORG*>(hb_blob_get_data(mVORGTable, nullptr));
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const VORGrec *lo = reinterpret_cast<const VORGrec*>(vorg + 1);
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const VORGrec *hi = lo + uint16_t(vorg->numVertOriginYMetrics);
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const VORGrec *limit = hi;
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while (lo < hi) {
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const VORGrec *mid = lo + (hi - lo) / 2;
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if (uint16_t(mid->glyphIndex) < aGlyph) {
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lo = mid + 1;
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} else {
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hi = mid;
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}
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}
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if (lo < limit && uint16_t(lo->glyphIndex) == aGlyph) {
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*aY = -FloatToFixed(GetFont()->FUnitsToDevUnitsFactor() *
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int16_t(lo->vertOriginY));
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} else {
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*aY = -FloatToFixed(GetFont()->FUnitsToDevUnitsFactor() *
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int16_t(vorg->defaultVertOriginY));
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}
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return;
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}
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if (mVmtxTable) {
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bool emptyGlyf;
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const Glyf *glyf = FindGlyf(aGlyph, &emptyGlyf);
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if (glyf) {
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if (emptyGlyf) {
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*aY = 0;
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return;
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}
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const GlyphMetrics* metrics =
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reinterpret_cast<const GlyphMetrics*>
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(hb_blob_get_data(mVmtxTable, nullptr));
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int16_t lsb;
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if (aGlyph < hb_codepoint_t(mNumLongVMetrics)) {
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// Glyph is covered by the first (advance & sidebearing) array
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lsb = int16_t(metrics->metrics[aGlyph].lsb);
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} else {
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// Glyph is covered by the second (sidebearing-only) array
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const AutoSwap_PRInt16* sidebearings =
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reinterpret_cast<const AutoSwap_PRInt16*>
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(&metrics->metrics[mNumLongVMetrics]);
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lsb = int16_t(sidebearings[aGlyph - mNumLongVMetrics]);
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}
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*aY = -FloatToFixed(mFont->FUnitsToDevUnitsFactor() *
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(lsb + int16_t(glyf->yMax)));
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return;
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} else {
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// XXX TODO: not a truetype font; need to get glyph extents
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// via some other API?
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// For now, fall through to default code below.
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}
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}
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// XXX should we consider using OS/2 sTypo* metrics if available?
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gfxFontEntry::AutoTable hheaTable(GetFont()->GetFontEntry(),
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TRUETYPE_TAG('h','h','e','a'));
|
|
if (hheaTable) {
|
|
uint32_t len;
|
|
const MetricsHeader* hhea =
|
|
reinterpret_cast<const MetricsHeader*>(hb_blob_get_data(hheaTable,
|
|
&len));
|
|
if (len >= sizeof(MetricsHeader)) {
|
|
// divide up the default advance we're using (1em) in proportion
|
|
// to ascender:descender from the hhea table
|
|
int16_t a = int16_t(hhea->ascender);
|
|
int16_t d = int16_t(hhea->descender);
|
|
*aY = -FloatToFixed(GetFont()->GetAdjustedSize() * a / (a - d));
|
|
return;
|
|
}
|
|
}
|
|
|
|
NS_NOTREACHED("we shouldn't be here!");
|
|
*aY = -FloatToFixed(GetFont()->GetAdjustedSize() / 2);
|
|
}
|
|
|
|
static hb_bool_t
|
|
HBGetGlyphExtents(hb_font_t *font, void *font_data,
|
|
hb_codepoint_t glyph,
|
|
hb_glyph_extents_t *extents,
|
|
void *user_data)
|
|
{
|
|
const gfxHarfBuzzShaper::FontCallbackData *fcd =
|
|
static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
|
|
return fcd->mShaper->GetGlyphExtents(glyph, extents);
|
|
}
|
|
|
|
// Find the data for glyph ID |aGlyph| in the 'glyf' table, if present.
|
|
// Returns null if not found, otherwise pointer to the beginning of the
|
|
// glyph's data. Sets aEmptyGlyf true if there is no actual data;
|
|
// otherwise, it's guaranteed that we can read at least the bounding box.
|
|
const gfxHarfBuzzShaper::Glyf*
|
|
gfxHarfBuzzShaper::FindGlyf(hb_codepoint_t aGlyph, bool *aEmptyGlyf) const
|
|
{
|
|
if (!mLoadedLocaGlyf) {
|
|
mLoadedLocaGlyf = true; // only try this once; if it fails, this
|
|
// isn't a truetype font
|
|
gfxFontEntry *entry = mFont->GetFontEntry();
|
|
uint32_t len;
|
|
gfxFontEntry::AutoTable headTable(entry,
|
|
TRUETYPE_TAG('h','e','a','d'));
|
|
if (!headTable) {
|
|
return nullptr;
|
|
}
|
|
const HeadTable* head =
|
|
reinterpret_cast<const HeadTable*>(hb_blob_get_data(headTable,
|
|
&len));
|
|
if (len < sizeof(HeadTable)) {
|
|
return nullptr;
|
|
}
|
|
mLocaLongOffsets = int16_t(head->indexToLocFormat) > 0;
|
|
mLocaTable = entry->GetFontTable(TRUETYPE_TAG('l','o','c','a'));
|
|
mGlyfTable = entry->GetFontTable(TRUETYPE_TAG('g','l','y','f'));
|
|
}
|
|
|
|
if (!mLocaTable || !mGlyfTable) {
|
|
// it's not a truetype font
|
|
return nullptr;
|
|
}
|
|
|
|
uint32_t offset; // offset of glyph record in the 'glyf' table
|
|
uint32_t len;
|
|
const char* data = hb_blob_get_data(mLocaTable, &len);
|
|
if (mLocaLongOffsets) {
|
|
if ((aGlyph + 1) * sizeof(AutoSwap_PRUint32) > len) {
|
|
return nullptr;
|
|
}
|
|
const AutoSwap_PRUint32* offsets =
|
|
reinterpret_cast<const AutoSwap_PRUint32*>(data);
|
|
offset = offsets[aGlyph];
|
|
*aEmptyGlyf = (offset == uint16_t(offsets[aGlyph + 1]));
|
|
} else {
|
|
if ((aGlyph + 1) * sizeof(AutoSwap_PRUint16) > len) {
|
|
return nullptr;
|
|
}
|
|
const AutoSwap_PRUint16* offsets =
|
|
reinterpret_cast<const AutoSwap_PRUint16*>(data);
|
|
offset = uint16_t(offsets[aGlyph]);
|
|
*aEmptyGlyf = (offset == uint16_t(offsets[aGlyph + 1]));
|
|
offset *= 2;
|
|
}
|
|
|
|
data = hb_blob_get_data(mGlyfTable, &len);
|
|
if (offset + sizeof(Glyf) > len) {
|
|
return nullptr;
|
|
}
|
|
|
|
return reinterpret_cast<const Glyf*>(data + offset);
|
|
}
|
|
|
|
hb_bool_t
|
|
gfxHarfBuzzShaper::GetGlyphExtents(hb_codepoint_t aGlyph,
|
|
hb_glyph_extents_t *aExtents) const
|
|
{
|
|
bool emptyGlyf;
|
|
const Glyf *glyf = FindGlyf(aGlyph, &emptyGlyf);
|
|
if (!glyf) {
|
|
// TODO: for non-truetype fonts, get extents some other way?
|
|
return false;
|
|
}
|
|
|
|
if (emptyGlyf) {
|
|
aExtents->x_bearing = 0;
|
|
aExtents->y_bearing = 0;
|
|
aExtents->width = 0;
|
|
aExtents->height = 0;
|
|
return true;
|
|
}
|
|
|
|
double f = mFont->FUnitsToDevUnitsFactor();
|
|
aExtents->x_bearing = FloatToFixed(int16_t(glyf->xMin) * f);
|
|
aExtents->width =
|
|
FloatToFixed((int16_t(glyf->xMax) - int16_t(glyf->xMin)) * f);
|
|
|
|
// Our y-coordinates are positive-downwards, whereas harfbuzz assumes
|
|
// positive-upwards; hence the apparently-reversed subtractions here.
|
|
aExtents->y_bearing =
|
|
FloatToFixed(int16_t(glyf->yMax) * f -
|
|
mFont->GetHorizontalMetrics().emAscent);
|
|
aExtents->height =
|
|
FloatToFixed((int16_t(glyf->yMin) - int16_t(glyf->yMax)) * f);
|
|
|
|
return true;
|
|
}
|
|
|
|
static hb_bool_t
|
|
HBGetContourPoint(hb_font_t *font, void *font_data,
|
|
unsigned int point_index, hb_codepoint_t glyph,
|
|
hb_position_t *x, hb_position_t *y,
|
|
void *user_data)
|
|
{
|
|
/* not yet implemented - no support for used of hinted contour points
|
|
to fine-tune anchor positions in GPOS AnchorFormat2 */
|
|
return false;
|
|
}
|
|
|
|
struct KernHeaderFmt0 {
|
|
AutoSwap_PRUint16 nPairs;
|
|
AutoSwap_PRUint16 searchRange;
|
|
AutoSwap_PRUint16 entrySelector;
|
|
AutoSwap_PRUint16 rangeShift;
|
|
};
|
|
|
|
struct KernPair {
|
|
AutoSwap_PRUint16 left;
|
|
AutoSwap_PRUint16 right;
|
|
AutoSwap_PRInt16 value;
|
|
};
|
|
|
|
// Find a kern pair in a Format 0 subtable.
|
|
// The aSubtable parameter points to the subtable itself, NOT its header,
|
|
// as the header structure differs between Windows and Mac (v0 and v1.0)
|
|
// versions of the 'kern' table.
|
|
// aSubtableLen is the length of the subtable EXCLUDING its header.
|
|
// If the pair <aFirstGlyph,aSecondGlyph> is found, the kerning value is
|
|
// added to aValue, so that multiple subtables can accumulate a total
|
|
// kerning value for a given pair.
|
|
static void
|
|
GetKernValueFmt0(const void* aSubtable,
|
|
uint32_t aSubtableLen,
|
|
uint16_t aFirstGlyph,
|
|
uint16_t aSecondGlyph,
|
|
int32_t& aValue,
|
|
bool aIsOverride = false,
|
|
bool aIsMinimum = false)
|
|
{
|
|
const KernHeaderFmt0* hdr =
|
|
reinterpret_cast<const KernHeaderFmt0*>(aSubtable);
|
|
|
|
const KernPair *lo = reinterpret_cast<const KernPair*>(hdr + 1);
|
|
const KernPair *hi = lo + uint16_t(hdr->nPairs);
|
|
const KernPair *limit = hi;
|
|
|
|
if (reinterpret_cast<const char*>(aSubtable) + aSubtableLen <
|
|
reinterpret_cast<const char*>(hi)) {
|
|
// subtable is not large enough to contain the claimed number
|
|
// of kern pairs, so just ignore it
|
|
return;
|
|
}
|
|
|
|
#define KERN_PAIR_KEY(l,r) (uint32_t((uint16_t(l) << 16) + uint16_t(r)))
|
|
|
|
uint32_t key = KERN_PAIR_KEY(aFirstGlyph, aSecondGlyph);
|
|
while (lo < hi) {
|
|
const KernPair *mid = lo + (hi - lo) / 2;
|
|
if (KERN_PAIR_KEY(mid->left, mid->right) < key) {
|
|
lo = mid + 1;
|
|
} else {
|
|
hi = mid;
|
|
}
|
|
}
|
|
|
|
if (lo < limit && KERN_PAIR_KEY(lo->left, lo->right) == key) {
|
|
if (aIsOverride) {
|
|
aValue = int16_t(lo->value);
|
|
} else if (aIsMinimum) {
|
|
aValue = std::max(aValue, int32_t(lo->value));
|
|
} else {
|
|
aValue += int16_t(lo->value);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Get kerning value from Apple (version 1.0) kern table,
|
|
// subtable format 2 (simple N x M array of kerning values)
|
|
|
|
// See http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html
|
|
// for details of version 1.0 format 2 subtable.
|
|
|
|
struct KernHeaderVersion1Fmt2 {
|
|
KernTableSubtableHeaderVersion1 header;
|
|
AutoSwap_PRUint16 rowWidth;
|
|
AutoSwap_PRUint16 leftOffsetTable;
|
|
AutoSwap_PRUint16 rightOffsetTable;
|
|
AutoSwap_PRUint16 array;
|
|
};
|
|
|
|
struct KernClassTableHdr {
|
|
AutoSwap_PRUint16 firstGlyph;
|
|
AutoSwap_PRUint16 nGlyphs;
|
|
AutoSwap_PRUint16 offsets[1]; // actually an array of nGlyphs entries
|
|
};
|
|
|
|
static int16_t
|
|
GetKernValueVersion1Fmt2(const void* aSubtable,
|
|
uint32_t aSubtableLen,
|
|
uint16_t aFirstGlyph,
|
|
uint16_t aSecondGlyph)
|
|
{
|
|
if (aSubtableLen < sizeof(KernHeaderVersion1Fmt2)) {
|
|
return 0;
|
|
}
|
|
|
|
const char* base = reinterpret_cast<const char*>(aSubtable);
|
|
const char* subtableEnd = base + aSubtableLen;
|
|
|
|
const KernHeaderVersion1Fmt2* h =
|
|
reinterpret_cast<const KernHeaderVersion1Fmt2*>(aSubtable);
|
|
uint32_t offset = h->array;
|
|
|
|
const KernClassTableHdr* leftClassTable =
|
|
reinterpret_cast<const KernClassTableHdr*>(base +
|
|
uint16_t(h->leftOffsetTable));
|
|
if (reinterpret_cast<const char*>(leftClassTable) +
|
|
sizeof(KernClassTableHdr) > subtableEnd) {
|
|
return 0;
|
|
}
|
|
if (aFirstGlyph >= uint16_t(leftClassTable->firstGlyph)) {
|
|
aFirstGlyph -= uint16_t(leftClassTable->firstGlyph);
|
|
if (aFirstGlyph < uint16_t(leftClassTable->nGlyphs)) {
|
|
if (reinterpret_cast<const char*>(leftClassTable) +
|
|
sizeof(KernClassTableHdr) +
|
|
aFirstGlyph * sizeof(uint16_t) >= subtableEnd) {
|
|
return 0;
|
|
}
|
|
offset = uint16_t(leftClassTable->offsets[aFirstGlyph]);
|
|
}
|
|
}
|
|
|
|
const KernClassTableHdr* rightClassTable =
|
|
reinterpret_cast<const KernClassTableHdr*>(base +
|
|
uint16_t(h->rightOffsetTable));
|
|
if (reinterpret_cast<const char*>(rightClassTable) +
|
|
sizeof(KernClassTableHdr) > subtableEnd) {
|
|
return 0;
|
|
}
|
|
if (aSecondGlyph >= uint16_t(rightClassTable->firstGlyph)) {
|
|
aSecondGlyph -= uint16_t(rightClassTable->firstGlyph);
|
|
if (aSecondGlyph < uint16_t(rightClassTable->nGlyphs)) {
|
|
if (reinterpret_cast<const char*>(rightClassTable) +
|
|
sizeof(KernClassTableHdr) +
|
|
aSecondGlyph * sizeof(uint16_t) >= subtableEnd) {
|
|
return 0;
|
|
}
|
|
offset += uint16_t(rightClassTable->offsets[aSecondGlyph]);
|
|
}
|
|
}
|
|
|
|
const AutoSwap_PRInt16* pval =
|
|
reinterpret_cast<const AutoSwap_PRInt16*>(base + offset);
|
|
if (reinterpret_cast<const char*>(pval + 1) >= subtableEnd) {
|
|
return 0;
|
|
}
|
|
return *pval;
|
|
}
|
|
|
|
// Get kerning value from Apple (version 1.0) kern table,
|
|
// subtable format 3 (simple N x M array of kerning values)
|
|
|
|
// See http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html
|
|
// for details of version 1.0 format 3 subtable.
|
|
|
|
struct KernHeaderVersion1Fmt3 {
|
|
KernTableSubtableHeaderVersion1 header;
|
|
AutoSwap_PRUint16 glyphCount;
|
|
uint8_t kernValueCount;
|
|
uint8_t leftClassCount;
|
|
uint8_t rightClassCount;
|
|
uint8_t flags;
|
|
};
|
|
|
|
static int16_t
|
|
GetKernValueVersion1Fmt3(const void* aSubtable,
|
|
uint32_t aSubtableLen,
|
|
uint16_t aFirstGlyph,
|
|
uint16_t aSecondGlyph)
|
|
{
|
|
// check that we can safely read the header fields
|
|
if (aSubtableLen < sizeof(KernHeaderVersion1Fmt3)) {
|
|
return 0;
|
|
}
|
|
|
|
const KernHeaderVersion1Fmt3* hdr =
|
|
reinterpret_cast<const KernHeaderVersion1Fmt3*>(aSubtable);
|
|
if (hdr->flags != 0) {
|
|
return 0;
|
|
}
|
|
|
|
uint16_t glyphCount = hdr->glyphCount;
|
|
|
|
// check that table is large enough for the arrays
|
|
if (sizeof(KernHeaderVersion1Fmt3) +
|
|
hdr->kernValueCount * sizeof(int16_t) +
|
|
glyphCount + glyphCount +
|
|
hdr->leftClassCount * hdr->rightClassCount > aSubtableLen) {
|
|
return 0;
|
|
}
|
|
|
|
if (aFirstGlyph >= glyphCount || aSecondGlyph >= glyphCount) {
|
|
// glyphs are out of range for the class tables
|
|
return 0;
|
|
}
|
|
|
|
// get pointers to the four arrays within the subtable
|
|
const AutoSwap_PRInt16* kernValue =
|
|
reinterpret_cast<const AutoSwap_PRInt16*>(hdr + 1);
|
|
const uint8_t* leftClass =
|
|
reinterpret_cast<const uint8_t*>(kernValue + hdr->kernValueCount);
|
|
const uint8_t* rightClass = leftClass + glyphCount;
|
|
const uint8_t* kernIndex = rightClass + glyphCount;
|
|
|
|
uint8_t lc = leftClass[aFirstGlyph];
|
|
uint8_t rc = rightClass[aSecondGlyph];
|
|
if (lc >= hdr->leftClassCount || rc >= hdr->rightClassCount) {
|
|
return 0;
|
|
}
|
|
|
|
uint8_t ki = kernIndex[leftClass[aFirstGlyph] * hdr->rightClassCount +
|
|
rightClass[aSecondGlyph]];
|
|
if (ki >= hdr->kernValueCount) {
|
|
return 0;
|
|
}
|
|
|
|
return kernValue[ki];
|
|
}
|
|
|
|
#define KERN0_COVERAGE_HORIZONTAL 0x0001
|
|
#define KERN0_COVERAGE_MINIMUM 0x0002
|
|
#define KERN0_COVERAGE_CROSS_STREAM 0x0004
|
|
#define KERN0_COVERAGE_OVERRIDE 0x0008
|
|
#define KERN0_COVERAGE_RESERVED 0x00F0
|
|
|
|
#define KERN1_COVERAGE_VERTICAL 0x8000
|
|
#define KERN1_COVERAGE_CROSS_STREAM 0x4000
|
|
#define KERN1_COVERAGE_VARIATION 0x2000
|
|
#define KERN1_COVERAGE_RESERVED 0x1F00
|
|
|
|
hb_position_t
|
|
gfxHarfBuzzShaper::GetHKerning(uint16_t aFirstGlyph,
|
|
uint16_t aSecondGlyph) const
|
|
{
|
|
// We want to ignore any kern pairs involving <space>, because we are
|
|
// handling words in isolation, the only space characters seen here are
|
|
// the ones artificially added by the textRun code.
|
|
uint32_t spaceGlyph = mFont->GetSpaceGlyph();
|
|
if (aFirstGlyph == spaceGlyph || aSecondGlyph == spaceGlyph) {
|
|
return 0;
|
|
}
|
|
|
|
if (!mKernTable) {
|
|
mKernTable = mFont->GetFontEntry()->GetFontTable(TRUETYPE_TAG('k','e','r','n'));
|
|
if (!mKernTable) {
|
|
mKernTable = hb_blob_get_empty();
|
|
}
|
|
}
|
|
|
|
uint32_t len;
|
|
const char* base = hb_blob_get_data(mKernTable, &len);
|
|
if (len < sizeof(KernTableVersion0)) {
|
|
return 0;
|
|
}
|
|
int32_t value = 0;
|
|
|
|
// First try to interpret as "version 0" kern table
|
|
// (see http://www.microsoft.com/typography/otspec/kern.htm)
|
|
const KernTableVersion0* kern0 =
|
|
reinterpret_cast<const KernTableVersion0*>(base);
|
|
if (uint16_t(kern0->version) == 0) {
|
|
uint16_t nTables = kern0->nTables;
|
|
uint32_t offs = sizeof(KernTableVersion0);
|
|
for (uint16_t i = 0; i < nTables; ++i) {
|
|
if (offs + sizeof(KernTableSubtableHeaderVersion0) > len) {
|
|
break;
|
|
}
|
|
const KernTableSubtableHeaderVersion0* st0 =
|
|
reinterpret_cast<const KernTableSubtableHeaderVersion0*>
|
|
(base + offs);
|
|
uint16_t subtableLen = uint16_t(st0->length);
|
|
if (offs + subtableLen > len) {
|
|
break;
|
|
}
|
|
offs += subtableLen;
|
|
uint16_t coverage = st0->coverage;
|
|
if (!(coverage & KERN0_COVERAGE_HORIZONTAL)) {
|
|
// we only care about horizontal kerning (for now)
|
|
continue;
|
|
}
|
|
if (coverage &
|
|
(KERN0_COVERAGE_CROSS_STREAM | KERN0_COVERAGE_RESERVED)) {
|
|
// we don't support cross-stream kerning, and
|
|
// reserved bits should be zero;
|
|
// ignore the subtable if not
|
|
continue;
|
|
}
|
|
uint8_t format = (coverage >> 8);
|
|
switch (format) {
|
|
case 0:
|
|
GetKernValueFmt0(st0 + 1, subtableLen - sizeof(*st0),
|
|
aFirstGlyph, aSecondGlyph, value,
|
|
(coverage & KERN0_COVERAGE_OVERRIDE) != 0,
|
|
(coverage & KERN0_COVERAGE_MINIMUM) != 0);
|
|
break;
|
|
default:
|
|
// TODO: implement support for other formats,
|
|
// if they're ever used in practice
|
|
#if DEBUG
|
|
{
|
|
char buf[1024];
|
|
snprintf_literal(buf, "unknown kern subtable in %s: "
|
|
"ver 0 format %d\n",
|
|
NS_ConvertUTF16toUTF8(mFont->GetName()).get(),
|
|
format);
|
|
NS_WARNING(buf);
|
|
}
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
// It wasn't a "version 0" table; check if it is Apple version 1.0
|
|
// (see http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html)
|
|
const KernTableVersion1* kern1 =
|
|
reinterpret_cast<const KernTableVersion1*>(base);
|
|
if (uint32_t(kern1->version) == 0x00010000) {
|
|
uint32_t nTables = kern1->nTables;
|
|
uint32_t offs = sizeof(KernTableVersion1);
|
|
for (uint32_t i = 0; i < nTables; ++i) {
|
|
if (offs + sizeof(KernTableSubtableHeaderVersion1) > len) {
|
|
break;
|
|
}
|
|
const KernTableSubtableHeaderVersion1* st1 =
|
|
reinterpret_cast<const KernTableSubtableHeaderVersion1*>
|
|
(base + offs);
|
|
uint32_t subtableLen = uint32_t(st1->length);
|
|
offs += subtableLen;
|
|
uint16_t coverage = st1->coverage;
|
|
if (coverage &
|
|
(KERN1_COVERAGE_VERTICAL |
|
|
KERN1_COVERAGE_CROSS_STREAM |
|
|
KERN1_COVERAGE_VARIATION |
|
|
KERN1_COVERAGE_RESERVED)) {
|
|
// we only care about horizontal kerning (for now),
|
|
// we don't support cross-stream kerning,
|
|
// we don't support variations,
|
|
// reserved bits should be zero;
|
|
// ignore the subtable if not
|
|
continue;
|
|
}
|
|
uint8_t format = (coverage & 0xff);
|
|
switch (format) {
|
|
case 0:
|
|
GetKernValueFmt0(st1 + 1, subtableLen - sizeof(*st1),
|
|
aFirstGlyph, aSecondGlyph, value);
|
|
break;
|
|
case 2:
|
|
value = GetKernValueVersion1Fmt2(st1, subtableLen,
|
|
aFirstGlyph, aSecondGlyph);
|
|
break;
|
|
case 3:
|
|
value = GetKernValueVersion1Fmt3(st1, subtableLen,
|
|
aFirstGlyph, aSecondGlyph);
|
|
break;
|
|
default:
|
|
// TODO: implement support for other formats.
|
|
// Note that format 1 cannot be supported here,
|
|
// as it requires the full glyph array to run the FSM,
|
|
// not just the current glyph pair.
|
|
#if DEBUG
|
|
{
|
|
char buf[1024];
|
|
snprintf_literal(buf, "unknown kern subtable in %s: "
|
|
"ver 0 format %d\n",
|
|
NS_ConvertUTF16toUTF8(mFont->GetName()).get(),
|
|
format);
|
|
NS_WARNING(buf);
|
|
}
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (value != 0) {
|
|
return FloatToFixed(mFont->FUnitsToDevUnitsFactor() * value);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static hb_position_t
|
|
HBGetHKerning(hb_font_t *font, void *font_data,
|
|
hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
|
|
void *user_data)
|
|
{
|
|
const gfxHarfBuzzShaper::FontCallbackData *fcd =
|
|
static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
|
|
return fcd->mShaper->GetHKerning(first_glyph, second_glyph);
|
|
}
|
|
|
|
/*
|
|
* HarfBuzz unicode property callbacks
|
|
*/
|
|
|
|
static hb_codepoint_t
|
|
HBGetMirroring(hb_unicode_funcs_t *ufuncs, hb_codepoint_t aCh,
|
|
void *user_data)
|
|
{
|
|
return GetMirroredChar(aCh);
|
|
}
|
|
|
|
static hb_unicode_general_category_t
|
|
HBGetGeneralCategory(hb_unicode_funcs_t *ufuncs, hb_codepoint_t aCh,
|
|
void *user_data)
|
|
{
|
|
return hb_unicode_general_category_t(GetGeneralCategory(aCh));
|
|
}
|
|
|
|
static hb_script_t
|
|
HBGetScript(hb_unicode_funcs_t *ufuncs, hb_codepoint_t aCh, void *user_data)
|
|
{
|
|
return hb_script_t(GetScriptTagForCode(GetScriptCode(aCh)));
|
|
}
|
|
|
|
static hb_unicode_combining_class_t
|
|
HBGetCombiningClass(hb_unicode_funcs_t *ufuncs, hb_codepoint_t aCh,
|
|
void *user_data)
|
|
{
|
|
return hb_unicode_combining_class_t(GetCombiningClass(aCh));
|
|
}
|
|
|
|
// Hebrew presentation forms with dagesh, for characters 0x05D0..0x05EA;
|
|
// note that some letters do not have a dagesh presForm encoded
|
|
static const char16_t sDageshForms[0x05EA - 0x05D0 + 1] = {
|
|
0xFB30, // ALEF
|
|
0xFB31, // BET
|
|
0xFB32, // GIMEL
|
|
0xFB33, // DALET
|
|
0xFB34, // HE
|
|
0xFB35, // VAV
|
|
0xFB36, // ZAYIN
|
|
0, // HET
|
|
0xFB38, // TET
|
|
0xFB39, // YOD
|
|
0xFB3A, // FINAL KAF
|
|
0xFB3B, // KAF
|
|
0xFB3C, // LAMED
|
|
0, // FINAL MEM
|
|
0xFB3E, // MEM
|
|
0, // FINAL NUN
|
|
0xFB40, // NUN
|
|
0xFB41, // SAMEKH
|
|
0, // AYIN
|
|
0xFB43, // FINAL PE
|
|
0xFB44, // PE
|
|
0, // FINAL TSADI
|
|
0xFB46, // TSADI
|
|
0xFB47, // QOF
|
|
0xFB48, // RESH
|
|
0xFB49, // SHIN
|
|
0xFB4A // TAV
|
|
};
|
|
|
|
static hb_bool_t
|
|
HBUnicodeCompose(hb_unicode_funcs_t *ufuncs,
|
|
hb_codepoint_t a,
|
|
hb_codepoint_t b,
|
|
hb_codepoint_t *ab,
|
|
void *user_data)
|
|
{
|
|
#if MOZ_HB_SHAPER_USE_ICU_NORMALIZATION
|
|
|
|
if (sNormalizer) {
|
|
UChar32 ch = unorm2_composePair(sNormalizer, a, b);
|
|
if (ch >= 0) {
|
|
*ab = ch;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
#else // no ICU available, use the old nsUnicodeNormalizer
|
|
|
|
if (nsUnicodeNormalizer::Compose(a, b, ab)) {
|
|
return true;
|
|
}
|
|
|
|
#endif
|
|
|
|
if ((b & 0x1fff80) == 0x0580) {
|
|
// special-case Hebrew presentation forms that are excluded from
|
|
// standard normalization, but wanted for old fonts
|
|
switch (b) {
|
|
case 0x05B4: // HIRIQ
|
|
if (a == 0x05D9) { // YOD
|
|
*ab = 0xFB1D;
|
|
return true;
|
|
}
|
|
break;
|
|
case 0x05B7: // patah
|
|
if (a == 0x05F2) { // YIDDISH YOD YOD
|
|
*ab = 0xFB1F;
|
|
return true;
|
|
}
|
|
if (a == 0x05D0) { // ALEF
|
|
*ab = 0xFB2E;
|
|
return true;
|
|
}
|
|
break;
|
|
case 0x05B8: // QAMATS
|
|
if (a == 0x05D0) { // ALEF
|
|
*ab = 0xFB2F;
|
|
return true;
|
|
}
|
|
break;
|
|
case 0x05B9: // HOLAM
|
|
if (a == 0x05D5) { // VAV
|
|
*ab = 0xFB4B;
|
|
return true;
|
|
}
|
|
break;
|
|
case 0x05BC: // DAGESH
|
|
if (a >= 0x05D0 && a <= 0x05EA) {
|
|
*ab = sDageshForms[a - 0x05D0];
|
|
return (*ab != 0);
|
|
}
|
|
if (a == 0xFB2A) { // SHIN WITH SHIN DOT
|
|
*ab = 0xFB2C;
|
|
return true;
|
|
}
|
|
if (a == 0xFB2B) { // SHIN WITH SIN DOT
|
|
*ab = 0xFB2D;
|
|
return true;
|
|
}
|
|
break;
|
|
case 0x05BF: // RAFE
|
|
switch (a) {
|
|
case 0x05D1: // BET
|
|
*ab = 0xFB4C;
|
|
return true;
|
|
case 0x05DB: // KAF
|
|
*ab = 0xFB4D;
|
|
return true;
|
|
case 0x05E4: // PE
|
|
*ab = 0xFB4E;
|
|
return true;
|
|
}
|
|
break;
|
|
case 0x05C1: // SHIN DOT
|
|
if (a == 0x05E9) { // SHIN
|
|
*ab = 0xFB2A;
|
|
return true;
|
|
}
|
|
if (a == 0xFB49) { // SHIN WITH DAGESH
|
|
*ab = 0xFB2C;
|
|
return true;
|
|
}
|
|
break;
|
|
case 0x05C2: // SIN DOT
|
|
if (a == 0x05E9) { // SHIN
|
|
*ab = 0xFB2B;
|
|
return true;
|
|
}
|
|
if (a == 0xFB49) { // SHIN WITH DAGESH
|
|
*ab = 0xFB2D;
|
|
return true;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static hb_bool_t
|
|
HBUnicodeDecompose(hb_unicode_funcs_t *ufuncs,
|
|
hb_codepoint_t ab,
|
|
hb_codepoint_t *a,
|
|
hb_codepoint_t *b,
|
|
void *user_data)
|
|
{
|
|
#ifdef MOZ_WIDGET_ANDROID
|
|
// Hack for the SamsungDevanagari font, bug 1012365:
|
|
// support U+0972 by decomposing it.
|
|
if (ab == 0x0972) {
|
|
*a = 0x0905;
|
|
*b = 0x0945;
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
#if MOZ_HB_SHAPER_USE_ICU_NORMALIZATION
|
|
|
|
if (!sNormalizer) {
|
|
return false;
|
|
}
|
|
|
|
// Canonical decompositions are never more than two characters,
|
|
// or a maximum of 4 utf-16 code units.
|
|
const unsigned MAX_DECOMP_LENGTH = 4;
|
|
|
|
UErrorCode error = U_ZERO_ERROR;
|
|
UChar decomp[MAX_DECOMP_LENGTH];
|
|
int32_t len = unorm2_getRawDecomposition(sNormalizer, ab, decomp,
|
|
MAX_DECOMP_LENGTH, &error);
|
|
if (U_FAILURE(error) || len < 0) {
|
|
return false;
|
|
}
|
|
|
|
UText text = UTEXT_INITIALIZER;
|
|
utext_openUChars(&text, decomp, len, &error);
|
|
NS_ASSERTION(U_SUCCESS(error), "UText failure?");
|
|
|
|
UChar32 ch = UTEXT_NEXT32(&text);
|
|
if (ch != U_SENTINEL) {
|
|
*a = ch;
|
|
}
|
|
ch = UTEXT_NEXT32(&text);
|
|
if (ch != U_SENTINEL) {
|
|
*b = ch;
|
|
}
|
|
utext_close(&text);
|
|
|
|
return *b != 0 || *a != ab;
|
|
|
|
#else // no ICU available, use the old nsUnicodeNormalizer
|
|
|
|
return nsUnicodeNormalizer::DecomposeNonRecursively(ab, a, b);
|
|
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
AddOpenTypeFeature(const uint32_t& aTag, uint32_t& aValue, void *aUserArg)
|
|
{
|
|
nsTArray<hb_feature_t>* features = static_cast<nsTArray<hb_feature_t>*> (aUserArg);
|
|
|
|
hb_feature_t feat = { 0, 0, 0, UINT_MAX };
|
|
feat.tag = aTag;
|
|
feat.value = aValue;
|
|
features->AppendElement(feat);
|
|
}
|
|
|
|
/*
|
|
* gfxFontShaper override to initialize the text run using HarfBuzz
|
|
*/
|
|
|
|
static hb_font_funcs_t * sHBFontFuncs = nullptr;
|
|
static hb_unicode_funcs_t * sHBUnicodeFuncs = nullptr;
|
|
static const hb_script_t sMathScript =
|
|
hb_ot_tag_to_script(HB_TAG('m','a','t','h'));
|
|
|
|
bool
|
|
gfxHarfBuzzShaper::Initialize()
|
|
{
|
|
if (mInitialized) {
|
|
return mHBFont != nullptr;
|
|
}
|
|
mInitialized = true;
|
|
mCallbackData.mShaper = this;
|
|
|
|
mUseFontGlyphWidths = mFont->ProvidesGlyphWidths();
|
|
|
|
if (!sHBFontFuncs) {
|
|
// static function callback pointers, initialized by the first
|
|
// harfbuzz shaper used
|
|
sHBFontFuncs = hb_font_funcs_create();
|
|
hb_font_funcs_set_glyph_func(sHBFontFuncs, HBGetGlyph,
|
|
nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_h_advance_func(sHBFontFuncs,
|
|
HBGetGlyphHAdvance,
|
|
nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_v_advance_func(sHBFontFuncs,
|
|
HBGetGlyphVAdvance,
|
|
nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_h_origin_func(sHBFontFuncs,
|
|
HBGetGlyphHOrigin,
|
|
nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_v_origin_func(sHBFontFuncs,
|
|
HBGetGlyphVOrigin,
|
|
nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_extents_func(sHBFontFuncs,
|
|
HBGetGlyphExtents,
|
|
nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_contour_point_func(sHBFontFuncs,
|
|
HBGetContourPoint,
|
|
nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_h_kerning_func(sHBFontFuncs,
|
|
HBGetHKerning,
|
|
nullptr, nullptr);
|
|
|
|
sHBUnicodeFuncs =
|
|
hb_unicode_funcs_create(hb_unicode_funcs_get_empty());
|
|
hb_unicode_funcs_set_mirroring_func(sHBUnicodeFuncs,
|
|
HBGetMirroring,
|
|
nullptr, nullptr);
|
|
hb_unicode_funcs_set_script_func(sHBUnicodeFuncs, HBGetScript,
|
|
nullptr, nullptr);
|
|
hb_unicode_funcs_set_general_category_func(sHBUnicodeFuncs,
|
|
HBGetGeneralCategory,
|
|
nullptr, nullptr);
|
|
hb_unicode_funcs_set_combining_class_func(sHBUnicodeFuncs,
|
|
HBGetCombiningClass,
|
|
nullptr, nullptr);
|
|
hb_unicode_funcs_set_compose_func(sHBUnicodeFuncs,
|
|
HBUnicodeCompose,
|
|
nullptr, nullptr);
|
|
hb_unicode_funcs_set_decompose_func(sHBUnicodeFuncs,
|
|
HBUnicodeDecompose,
|
|
nullptr, nullptr);
|
|
|
|
#if MOZ_HB_SHAPER_USE_ICU_NORMALIZATION
|
|
UErrorCode error = U_ZERO_ERROR;
|
|
sNormalizer = unorm2_getNFCInstance(&error);
|
|
NS_ASSERTION(U_SUCCESS(error), "failed to get ICU normalizer");
|
|
#endif
|
|
}
|
|
|
|
gfxFontEntry *entry = mFont->GetFontEntry();
|
|
if (!mUseFontGetGlyph) {
|
|
// get the cmap table and find offset to our subtable
|
|
mCmapTable = entry->GetFontTable(TRUETYPE_TAG('c','m','a','p'));
|
|
if (!mCmapTable) {
|
|
NS_WARNING("failed to load cmap, glyphs will be missing");
|
|
return false;
|
|
}
|
|
uint32_t len;
|
|
const uint8_t* data = (const uint8_t*)hb_blob_get_data(mCmapTable, &len);
|
|
bool symbol;
|
|
mCmapFormat = gfxFontUtils::
|
|
FindPreferredSubtable(data, len,
|
|
&mSubtableOffset, &mUVSTableOffset,
|
|
&symbol);
|
|
if (mCmapFormat <= 0) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!mUseFontGlyphWidths) {
|
|
// If font doesn't implement GetGlyphWidth, we will be reading
|
|
// the metrics table directly, so make sure we can load it.
|
|
if (!LoadHmtxTable()) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
mHBFont = hb_font_create(mHBFace);
|
|
hb_font_set_funcs(mHBFont, sHBFontFuncs, &mCallbackData, nullptr);
|
|
hb_font_set_ppem(mHBFont, mFont->GetAdjustedSize(), mFont->GetAdjustedSize());
|
|
uint32_t scale = FloatToFixed(mFont->GetAdjustedSize()); // 16.16 fixed-point
|
|
hb_font_set_scale(mHBFont, scale, scale);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
gfxHarfBuzzShaper::LoadHmtxTable()
|
|
{
|
|
// Read mNumLongHMetrics from metrics-head table without caching its
|
|
// blob, and preload/cache the metrics table.
|
|
gfxFontEntry *entry = mFont->GetFontEntry();
|
|
gfxFontEntry::AutoTable hheaTable(entry, TRUETYPE_TAG('h','h','e','a'));
|
|
if (hheaTable) {
|
|
uint32_t len;
|
|
const MetricsHeader* hhea =
|
|
reinterpret_cast<const MetricsHeader*>
|
|
(hb_blob_get_data(hheaTable, &len));
|
|
if (len >= sizeof(MetricsHeader)) {
|
|
mNumLongHMetrics = hhea->numOfLongMetrics;
|
|
if (mNumLongHMetrics > 0 &&
|
|
int16_t(hhea->metricDataFormat) == 0) {
|
|
// no point reading metrics if number of entries is zero!
|
|
// in that case, we won't be able to use this font
|
|
// (this method will return FALSE below if mHmtxTable
|
|
// is null)
|
|
mHmtxTable = entry->GetFontTable(TRUETYPE_TAG('h','m','t','x'));
|
|
if (mHmtxTable && hb_blob_get_length(mHmtxTable) <
|
|
mNumLongHMetrics * sizeof(LongMetric)) {
|
|
// metrics table is not large enough for the claimed
|
|
// number of entries: invalid, do not use.
|
|
hb_blob_destroy(mHmtxTable);
|
|
mHmtxTable = nullptr;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (!mHmtxTable) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
gfxHarfBuzzShaper::InitializeVertical()
|
|
{
|
|
// We only try this once. If we don't have a mHmtxTable after that,
|
|
// this font can't handle vertical shaping, so return false.
|
|
if (mVerticalInitialized) {
|
|
return mHmtxTable != nullptr;
|
|
}
|
|
mVerticalInitialized = true;
|
|
|
|
if (!mHmtxTable) {
|
|
if (!LoadHmtxTable()) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Load vertical metrics if present in the font; if not, we'll synthesize
|
|
// vertical glyph advances based on (horizontal) ascent/descent metrics.
|
|
gfxFontEntry *entry = mFont->GetFontEntry();
|
|
gfxFontEntry::AutoTable vheaTable(entry, TRUETYPE_TAG('v','h','e','a'));
|
|
if (vheaTable) {
|
|
uint32_t len;
|
|
const MetricsHeader* vhea =
|
|
reinterpret_cast<const MetricsHeader*>
|
|
(hb_blob_get_data(vheaTable, &len));
|
|
if (len >= sizeof(MetricsHeader)) {
|
|
mNumLongVMetrics = vhea->numOfLongMetrics;
|
|
gfxFontEntry::AutoTable
|
|
maxpTable(entry, TRUETYPE_TAG('m','a','x','p'));
|
|
int numGlyphs = -1; // invalid if we fail to read 'maxp'
|
|
if (maxpTable &&
|
|
hb_blob_get_length(maxpTable) >= sizeof(MaxpTableHeader)) {
|
|
const MaxpTableHeader* maxp =
|
|
reinterpret_cast<const MaxpTableHeader*>
|
|
(hb_blob_get_data(maxpTable, nullptr));
|
|
numGlyphs = uint16_t(maxp->numGlyphs);
|
|
}
|
|
if (mNumLongVMetrics > 0 && mNumLongVMetrics <= numGlyphs &&
|
|
int16_t(vhea->metricDataFormat) == 0) {
|
|
mVmtxTable = entry->GetFontTable(TRUETYPE_TAG('v','m','t','x'));
|
|
if (mVmtxTable && hb_blob_get_length(mVmtxTable) <
|
|
mNumLongVMetrics * sizeof(LongMetric) +
|
|
(numGlyphs - mNumLongVMetrics) * sizeof(int16_t)) {
|
|
// metrics table is not large enough for the claimed
|
|
// number of entries: invalid, do not use.
|
|
hb_blob_destroy(mVmtxTable);
|
|
mVmtxTable = nullptr;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// For CFF fonts only, load a VORG table if present.
|
|
if (entry->HasFontTable(TRUETYPE_TAG('C','F','F',' '))) {
|
|
mVORGTable = entry->GetFontTable(TRUETYPE_TAG('V','O','R','G'));
|
|
if (mVORGTable) {
|
|
uint32_t len;
|
|
const VORG* vorg =
|
|
reinterpret_cast<const VORG*>(hb_blob_get_data(mVORGTable,
|
|
&len));
|
|
if (len < sizeof(VORG) ||
|
|
uint16_t(vorg->majorVersion) != 1 ||
|
|
uint16_t(vorg->minorVersion) != 0 ||
|
|
len < sizeof(VORG) + uint16_t(vorg->numVertOriginYMetrics) *
|
|
sizeof(VORGrec)) {
|
|
// VORG table is an unknown version, or not large enough
|
|
// to be valid -- discard it.
|
|
NS_WARNING("discarding invalid VORG table");
|
|
hb_blob_destroy(mVORGTable);
|
|
mVORGTable = nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
gfxHarfBuzzShaper::ShapeText(gfxContext *aContext,
|
|
const char16_t *aText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
int32_t aScript,
|
|
bool aVertical,
|
|
gfxShapedText *aShapedText)
|
|
{
|
|
// some font back-ends require this in order to get proper hinted metrics
|
|
if (!mFont->SetupCairoFont(aContext)) {
|
|
return false;
|
|
}
|
|
|
|
mCallbackData.mContext = aContext;
|
|
mUseVerticalPresentationForms = false;
|
|
|
|
if (!Initialize()) {
|
|
return false;
|
|
}
|
|
|
|
if (aVertical) {
|
|
if (!InitializeVertical()) {
|
|
return false;
|
|
}
|
|
if (!mFont->GetFontEntry()->
|
|
SupportsOpenTypeFeature(aScript, HB_TAG('v','e','r','t'))) {
|
|
mUseVerticalPresentationForms = true;
|
|
}
|
|
}
|
|
|
|
const gfxFontStyle *style = mFont->GetStyle();
|
|
|
|
// determine whether petite-caps falls back to small-caps
|
|
bool addSmallCaps = false;
|
|
if (style->variantCaps != NS_FONT_VARIANT_CAPS_NORMAL) {
|
|
switch (style->variantCaps) {
|
|
case NS_FONT_VARIANT_CAPS_ALLPETITE:
|
|
case NS_FONT_VARIANT_CAPS_PETITECAPS:
|
|
bool synLower, synUpper;
|
|
mFont->SupportsVariantCaps(aScript, style->variantCaps,
|
|
addSmallCaps, synLower, synUpper);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
gfxFontEntry *entry = mFont->GetFontEntry();
|
|
|
|
// insert any merged features into hb_feature array
|
|
nsAutoTArray<hb_feature_t,20> features;
|
|
MergeFontFeatures(style,
|
|
entry->mFeatureSettings,
|
|
aShapedText->DisableLigatures(),
|
|
entry->FamilyName(),
|
|
addSmallCaps,
|
|
AddOpenTypeFeature,
|
|
&features);
|
|
|
|
bool isRightToLeft = aShapedText->IsRightToLeft();
|
|
hb_buffer_t *buffer = hb_buffer_create();
|
|
hb_buffer_set_unicode_funcs(buffer, sHBUnicodeFuncs);
|
|
|
|
hb_buffer_set_direction(buffer,
|
|
aVertical ? HB_DIRECTION_TTB :
|
|
(isRightToLeft ? HB_DIRECTION_RTL :
|
|
HB_DIRECTION_LTR));
|
|
hb_script_t scriptTag;
|
|
if (aShapedText->GetFlags() & gfxTextRunFactory::TEXT_USE_MATH_SCRIPT) {
|
|
scriptTag = sMathScript;
|
|
} else {
|
|
scriptTag = GetHBScriptUsedForShaping(aScript);
|
|
}
|
|
hb_buffer_set_script(buffer, scriptTag);
|
|
|
|
hb_language_t language;
|
|
if (style->languageOverride) {
|
|
language = hb_ot_tag_to_language(style->languageOverride);
|
|
} else if (entry->mLanguageOverride) {
|
|
language = hb_ot_tag_to_language(entry->mLanguageOverride);
|
|
} else if (style->explicitLanguage) {
|
|
nsCString langString;
|
|
style->language->ToUTF8String(langString);
|
|
language =
|
|
hb_language_from_string(langString.get(), langString.Length());
|
|
} else {
|
|
language = hb_ot_tag_to_language(HB_OT_TAG_DEFAULT_LANGUAGE);
|
|
}
|
|
hb_buffer_set_language(buffer, language);
|
|
|
|
uint32_t length = aLength;
|
|
hb_buffer_add_utf16(buffer,
|
|
reinterpret_cast<const uint16_t*>(aText),
|
|
length, 0, length);
|
|
|
|
hb_buffer_set_cluster_level(buffer, HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
|
|
|
|
hb_shape(mHBFont, buffer, features.Elements(), features.Length());
|
|
|
|
if (isRightToLeft) {
|
|
hb_buffer_reverse(buffer);
|
|
}
|
|
|
|
nsresult rv = SetGlyphsFromRun(aContext, aShapedText, aOffset, aLength,
|
|
aText, buffer, aVertical);
|
|
|
|
NS_WARN_IF_FALSE(NS_SUCCEEDED(rv), "failed to store glyphs into gfxShapedWord");
|
|
hb_buffer_destroy(buffer);
|
|
|
|
return NS_SUCCEEDED(rv);
|
|
}
|
|
|
|
#define SMALL_GLYPH_RUN 128 // some testing indicates that 90%+ of text runs
|
|
// will fit without requiring separate allocation
|
|
// for charToGlyphArray
|
|
|
|
nsresult
|
|
gfxHarfBuzzShaper::SetGlyphsFromRun(gfxContext *aContext,
|
|
gfxShapedText *aShapedText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
const char16_t *aText,
|
|
hb_buffer_t *aBuffer,
|
|
bool aVertical)
|
|
{
|
|
uint32_t numGlyphs;
|
|
const hb_glyph_info_t *ginfo = hb_buffer_get_glyph_infos(aBuffer, &numGlyphs);
|
|
if (numGlyphs == 0) {
|
|
return NS_OK;
|
|
}
|
|
|
|
nsAutoTArray<gfxTextRun::DetailedGlyph,1> detailedGlyphs;
|
|
|
|
uint32_t wordLength = aLength;
|
|
static const int32_t NO_GLYPH = -1;
|
|
AutoFallibleTArray<int32_t,SMALL_GLYPH_RUN> charToGlyphArray;
|
|
if (!charToGlyphArray.SetLength(wordLength, fallible)) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
int32_t *charToGlyph = charToGlyphArray.Elements();
|
|
for (uint32_t offset = 0; offset < wordLength; ++offset) {
|
|
charToGlyph[offset] = NO_GLYPH;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < numGlyphs; ++i) {
|
|
uint32_t loc = ginfo[i].cluster;
|
|
if (loc < wordLength) {
|
|
charToGlyph[loc] = i;
|
|
}
|
|
}
|
|
|
|
int32_t glyphStart = 0; // looking for a clump that starts at this glyph
|
|
int32_t charStart = 0; // and this char index within the range of the run
|
|
|
|
bool roundI;
|
|
bool roundB;
|
|
if (aVertical) {
|
|
aContext->GetRoundOffsetsToPixels(&roundB, &roundI);
|
|
} else {
|
|
aContext->GetRoundOffsetsToPixels(&roundI, &roundB);
|
|
}
|
|
|
|
int32_t appUnitsPerDevUnit = aShapedText->GetAppUnitsPerDevUnit();
|
|
gfxShapedText::CompressedGlyph *charGlyphs =
|
|
aShapedText->GetCharacterGlyphs() + aOffset;
|
|
|
|
// factor to convert 16.16 fixed-point pixels to app units
|
|
// (only used if not rounding)
|
|
double hb2appUnits = FixedToFloat(aShapedText->GetAppUnitsPerDevUnit());
|
|
|
|
// Residual from rounding of previous advance, for use in rounding the
|
|
// subsequent offset or advance appropriately. 16.16 fixed-point
|
|
//
|
|
// When rounding, the goal is to make the distance between glyphs and
|
|
// their base glyph equal to the integral number of pixels closest to that
|
|
// suggested by that shaper.
|
|
// i.e. posInfo[n].x_advance - posInfo[n].x_offset + posInfo[n+1].x_offset
|
|
//
|
|
// The value of the residual is the part of the desired distance that has
|
|
// not been included in integer offsets.
|
|
hb_position_t residual = 0;
|
|
|
|
// keep track of y-position to set glyph offsets if needed
|
|
nscoord bPos = 0;
|
|
|
|
const hb_glyph_position_t *posInfo =
|
|
hb_buffer_get_glyph_positions(aBuffer, nullptr);
|
|
|
|
while (glyphStart < int32_t(numGlyphs)) {
|
|
|
|
int32_t charEnd = ginfo[glyphStart].cluster;
|
|
int32_t glyphEnd = glyphStart;
|
|
int32_t charLimit = wordLength;
|
|
while (charEnd < charLimit) {
|
|
// This is normally executed once for each iteration of the outer loop,
|
|
// but in unusual cases where the character/glyph association is complex,
|
|
// the initial character range might correspond to a non-contiguous
|
|
// glyph range with "holes" in it. If so, we will repeat this loop to
|
|
// extend the character range until we have a contiguous glyph sequence.
|
|
charEnd += 1;
|
|
while (charEnd != charLimit && charToGlyph[charEnd] == NO_GLYPH) {
|
|
charEnd += 1;
|
|
}
|
|
|
|
// find the maximum glyph index covered by the clump so far
|
|
for (int32_t i = charStart; i < charEnd; ++i) {
|
|
if (charToGlyph[i] != NO_GLYPH) {
|
|
glyphEnd = std::max(glyphEnd, charToGlyph[i] + 1);
|
|
// update extent of glyph range
|
|
}
|
|
}
|
|
|
|
if (glyphEnd == glyphStart + 1) {
|
|
// for the common case of a single-glyph clump,
|
|
// we can skip the following checks
|
|
break;
|
|
}
|
|
|
|
if (glyphEnd == glyphStart) {
|
|
// no glyphs, try to extend the clump
|
|
continue;
|
|
}
|
|
|
|
// check whether all glyphs in the range are associated with the characters
|
|
// in our clump; if not, we have a discontinuous range, and should extend it
|
|
// unless we've reached the end of the text
|
|
bool allGlyphsAreWithinCluster = true;
|
|
for (int32_t i = glyphStart; i < glyphEnd; ++i) {
|
|
int32_t glyphCharIndex = ginfo[i].cluster;
|
|
if (glyphCharIndex < charStart || glyphCharIndex >= charEnd) {
|
|
allGlyphsAreWithinCluster = false;
|
|
break;
|
|
}
|
|
}
|
|
if (allGlyphsAreWithinCluster) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
NS_ASSERTION(glyphStart < glyphEnd,
|
|
"character/glyph clump contains no glyphs!");
|
|
NS_ASSERTION(charStart != charEnd,
|
|
"character/glyph clump contains no characters!");
|
|
|
|
// Now charStart..charEnd is a ligature clump, corresponding to glyphStart..glyphEnd;
|
|
// Set baseCharIndex to the char we'll actually attach the glyphs to (1st of ligature),
|
|
// and endCharIndex to the limit (position beyond the last char),
|
|
// adjusting for the offset of the stringRange relative to the textRun.
|
|
int32_t baseCharIndex, endCharIndex;
|
|
while (charEnd < int32_t(wordLength) && charToGlyph[charEnd] == NO_GLYPH)
|
|
charEnd++;
|
|
baseCharIndex = charStart;
|
|
endCharIndex = charEnd;
|
|
|
|
// Then we check if the clump falls outside our actual string range;
|
|
// if so, just go to the next.
|
|
if (baseCharIndex >= int32_t(wordLength)) {
|
|
glyphStart = glyphEnd;
|
|
charStart = charEnd;
|
|
continue;
|
|
}
|
|
// Ensure we won't try to go beyond the valid length of the textRun's text
|
|
endCharIndex = std::min<int32_t>(endCharIndex, wordLength);
|
|
|
|
// Now we're ready to set the glyph info in the textRun
|
|
int32_t glyphsInClump = glyphEnd - glyphStart;
|
|
|
|
// Check for default-ignorable char that didn't get filtered, combined,
|
|
// etc by the shaping process, and remove from the run.
|
|
// (This may be done within harfbuzz eventually.)
|
|
if (glyphsInClump == 1 && baseCharIndex + 1 == endCharIndex &&
|
|
aShapedText->FilterIfIgnorable(aOffset + baseCharIndex,
|
|
aText[baseCharIndex])) {
|
|
glyphStart = glyphEnd;
|
|
charStart = charEnd;
|
|
continue;
|
|
}
|
|
|
|
// HarfBuzz gives us physical x- and y-coordinates, but we will store
|
|
// them as logical inline- and block-direction values in the textrun.
|
|
|
|
hb_position_t i_offset, i_advance; // inline-direction offset/advance
|
|
hb_position_t b_offset, b_advance; // block-direction offset/advance
|
|
if (aVertical) {
|
|
i_offset = posInfo[glyphStart].y_offset;
|
|
i_advance = posInfo[glyphStart].y_advance;
|
|
b_offset = posInfo[glyphStart].x_offset;
|
|
b_advance = posInfo[glyphStart].x_advance;
|
|
} else {
|
|
i_offset = posInfo[glyphStart].x_offset;
|
|
i_advance = posInfo[glyphStart].x_advance;
|
|
b_offset = posInfo[glyphStart].y_offset;
|
|
b_advance = posInfo[glyphStart].y_advance;
|
|
}
|
|
|
|
nscoord iOffset, advance;
|
|
if (roundI) {
|
|
iOffset =
|
|
appUnitsPerDevUnit * FixedToIntRound(i_offset + residual);
|
|
// Desired distance from the base glyph to the next reference point.
|
|
hb_position_t width = i_advance - i_offset;
|
|
int intWidth = FixedToIntRound(width);
|
|
residual = width - FloatToFixed(intWidth);
|
|
advance = appUnitsPerDevUnit * intWidth + iOffset;
|
|
} else {
|
|
iOffset = floor(hb2appUnits * i_offset + 0.5);
|
|
advance = floor(hb2appUnits * i_advance + 0.5);
|
|
}
|
|
// Check if it's a simple one-to-one mapping
|
|
if (glyphsInClump == 1 &&
|
|
gfxTextRun::CompressedGlyph::IsSimpleGlyphID(ginfo[glyphStart].codepoint) &&
|
|
gfxTextRun::CompressedGlyph::IsSimpleAdvance(advance) &&
|
|
charGlyphs[baseCharIndex].IsClusterStart() &&
|
|
iOffset == 0 && b_offset == 0 &&
|
|
b_advance == 0 && bPos == 0)
|
|
{
|
|
charGlyphs[baseCharIndex].SetSimpleGlyph(advance,
|
|
ginfo[glyphStart].codepoint);
|
|
} else {
|
|
// Collect all glyphs in a list to be assigned to the first char;
|
|
// there must be at least one in the clump, and we already measured
|
|
// its advance, hence the placement of the loop-exit test and the
|
|
// measurement of the next glyph.
|
|
// For vertical orientation, we add a "base offset" to compensate
|
|
// for the positioning within the cluster being based on horizontal
|
|
// glyph origin/offset.
|
|
hb_position_t baseIOffset, baseBOffset;
|
|
if (aVertical) {
|
|
baseIOffset = 2 * (i_offset - i_advance);
|
|
baseBOffset = GetGlyphHAdvance(ginfo[glyphStart].codepoint);
|
|
}
|
|
while (1) {
|
|
gfxTextRun::DetailedGlyph* details =
|
|
detailedGlyphs.AppendElement();
|
|
details->mGlyphID = ginfo[glyphStart].codepoint;
|
|
|
|
details->mXOffset = iOffset;
|
|
details->mAdvance = advance;
|
|
|
|
details->mYOffset = bPos -
|
|
(roundB ? appUnitsPerDevUnit * FixedToIntRound(b_offset)
|
|
: floor(hb2appUnits * b_offset + 0.5));
|
|
|
|
if (b_advance != 0) {
|
|
bPos -=
|
|
roundB ? appUnitsPerDevUnit * FixedToIntRound(b_advance)
|
|
: floor(hb2appUnits * b_advance + 0.5);
|
|
}
|
|
if (++glyphStart >= glyphEnd) {
|
|
break;
|
|
}
|
|
|
|
if (aVertical) {
|
|
i_offset = baseIOffset - posInfo[glyphStart].y_offset;
|
|
i_advance = posInfo[glyphStart].y_advance;
|
|
b_offset = baseBOffset - posInfo[glyphStart].x_offset;
|
|
b_advance = posInfo[glyphStart].x_advance;
|
|
} else {
|
|
i_offset = posInfo[glyphStart].x_offset;
|
|
i_advance = posInfo[glyphStart].x_advance;
|
|
b_offset = posInfo[glyphStart].y_offset;
|
|
b_advance = posInfo[glyphStart].y_advance;
|
|
}
|
|
|
|
if (roundI) {
|
|
iOffset = appUnitsPerDevUnit *
|
|
FixedToIntRound(i_offset + residual);
|
|
// Desired distance to the next reference point. The
|
|
// residual is considered here, and includes the residual
|
|
// from the base glyph offset and subsequent advances, so
|
|
// that the distance from the base glyph is optimized
|
|
// rather than the distance from combining marks.
|
|
i_advance += residual;
|
|
int intAdvance = FixedToIntRound(i_advance);
|
|
residual = i_advance - FloatToFixed(intAdvance);
|
|
advance = appUnitsPerDevUnit * intAdvance;
|
|
} else {
|
|
iOffset = floor(hb2appUnits * i_offset + 0.5);
|
|
advance = floor(hb2appUnits * i_advance + 0.5);
|
|
}
|
|
}
|
|
|
|
gfxShapedText::CompressedGlyph g;
|
|
g.SetComplex(charGlyphs[baseCharIndex].IsClusterStart(),
|
|
true, detailedGlyphs.Length());
|
|
aShapedText->SetGlyphs(aOffset + baseCharIndex,
|
|
g, detailedGlyphs.Elements());
|
|
|
|
detailedGlyphs.Clear();
|
|
}
|
|
|
|
// the rest of the chars in the group are ligature continuations,
|
|
// no associated glyphs
|
|
while (++baseCharIndex != endCharIndex &&
|
|
baseCharIndex < int32_t(wordLength)) {
|
|
gfxShapedText::CompressedGlyph &g = charGlyphs[baseCharIndex];
|
|
NS_ASSERTION(!g.IsSimpleGlyph(), "overwriting a simple glyph");
|
|
g.SetComplex(g.IsClusterStart(), false, 0);
|
|
}
|
|
|
|
glyphStart = glyphEnd;
|
|
charStart = charEnd;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|