mirror of
https://github.com/mozilla/gecko-dev.git
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723 lines
23 KiB
C++
723 lines
23 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Foundation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Bas Schouten <bschouten@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "gfxDWriteFonts.h"
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#include "gfxDWriteShaper.h"
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#include "gfxHarfBuzzShaper.h"
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#include "gfxDWriteFontList.h"
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#include "gfxContext.h"
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#include <dwrite.h>
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#include "gfxDWriteTextAnalysis.h"
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#include "harfbuzz/hb-blob.h"
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// Chosen this as to resemble DWrite's own oblique face style.
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#define OBLIQUE_SKEW_FACTOR 0.3
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// This is also in gfxGDIFont.cpp. Would be nice to put it somewhere common,
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// but we can't declare it in the gfxFont.h or gfxFontUtils.h headers
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// because those are exported, and the cairo headers aren't.
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static inline cairo_antialias_t
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GetCairoAntialiasOption(gfxFont::AntialiasOption anAntialiasOption)
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{
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switch (anAntialiasOption) {
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default:
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case gfxFont::kAntialiasDefault:
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return CAIRO_ANTIALIAS_DEFAULT;
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case gfxFont::kAntialiasNone:
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return CAIRO_ANTIALIAS_NONE;
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case gfxFont::kAntialiasGrayscale:
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return CAIRO_ANTIALIAS_GRAY;
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case gfxFont::kAntialiasSubpixel:
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return CAIRO_ANTIALIAS_SUBPIXEL;
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}
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}
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// Code to determine whether Windows is set to use ClearType font smoothing;
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// based on private functions in cairo-win32-font.c
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#ifndef SPI_GETFONTSMOOTHINGTYPE
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#define SPI_GETFONTSMOOTHINGTYPE 0x200a
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#endif
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#ifndef FE_FONTSMOOTHINGCLEARTYPE
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#define FE_FONTSMOOTHINGCLEARTYPE 2
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#endif
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static bool
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HasClearType()
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{
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OSVERSIONINFO versionInfo;
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versionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
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return (GetVersionEx(&versionInfo) &&
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(versionInfo.dwMajorVersion > 5 ||
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(versionInfo.dwMajorVersion == 5 &&
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versionInfo.dwMinorVersion >= 1))); // XP or newer
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}
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static bool
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UsingClearType()
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{
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BOOL fontSmoothing;
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if (!SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &fontSmoothing, 0) ||
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!fontSmoothing)
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{
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return false;
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}
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if (!HasClearType()) {
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return false;
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}
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UINT type;
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if (SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &type, 0) &&
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type == FE_FONTSMOOTHINGCLEARTYPE)
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{
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return true;
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}
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return false;
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}
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////////////////////////////////////////////////////////////////////////////////
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// gfxDWriteFont
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gfxDWriteFont::gfxDWriteFont(gfxFontEntry *aFontEntry,
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const gfxFontStyle *aFontStyle,
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PRBool aNeedsBold,
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AntialiasOption anAAOption)
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: gfxFont(aFontEntry, aFontStyle, anAAOption)
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, mCairoFontFace(nsnull)
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, mCairoScaledFont(nsnull)
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, mMetrics(nsnull)
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, mNeedsOblique(PR_FALSE)
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, mNeedsBold(aNeedsBold)
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, mUseSubpixelPositions(PR_FALSE)
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, mAllowManualShowGlyphs(PR_TRUE)
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{
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gfxDWriteFontEntry *fe =
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static_cast<gfxDWriteFontEntry*>(aFontEntry);
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nsresult rv;
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DWRITE_FONT_SIMULATIONS sims = DWRITE_FONT_SIMULATIONS_NONE;
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if ((GetStyle()->style & (FONT_STYLE_ITALIC | FONT_STYLE_OBLIQUE)) &&
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!fe->IsItalic()) {
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// For this we always use the font_matrix for uniformity. Not the
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// DWrite simulation.
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mNeedsOblique = PR_TRUE;
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}
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if (aNeedsBold) {
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sims |= DWRITE_FONT_SIMULATIONS_BOLD;
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}
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rv = fe->CreateFontFace(getter_AddRefs(mFontFace), sims);
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if (NS_FAILED(rv)) {
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mIsValid = PR_FALSE;
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return;
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}
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if ((anAAOption == gfxFont::kAntialiasDefault && UsingClearType()) ||
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anAAOption == gfxFont::kAntialiasSubpixel)
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{
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mUseSubpixelPositions = PR_TRUE;
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// note that this may be reset to FALSE if we determine that a bitmap
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// strike is going to be used
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}
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ComputeMetrics();
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if (FontCanSupportHarfBuzz()) {
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mHarfBuzzShaper = new gfxHarfBuzzShaper(this);
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}
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}
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gfxDWriteFont::~gfxDWriteFont()
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{
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if (mCairoFontFace) {
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cairo_font_face_destroy(mCairoFontFace);
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}
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if (mCairoScaledFont) {
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cairo_scaled_font_destroy(mCairoScaledFont);
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}
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delete mMetrics;
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}
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gfxFont*
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gfxDWriteFont::CopyWithAntialiasOption(AntialiasOption anAAOption)
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{
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return new gfxDWriteFont(static_cast<gfxDWriteFontEntry*>(mFontEntry.get()),
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&mStyle, mNeedsBold, anAAOption);
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}
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void
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gfxDWriteFont::CreatePlatformShaper()
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{
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mPlatformShaper = new gfxDWriteShaper(this);
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}
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const gfxFont::Metrics&
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gfxDWriteFont::GetMetrics()
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{
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return *mMetrics;
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}
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PRBool
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gfxDWriteFont::GetFakeMetricsForArialBlack(DWRITE_FONT_METRICS *aFontMetrics)
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{
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gfxFontStyle style(mStyle);
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style.weight = 700;
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PRBool needsBold;
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gfxFontEntry *fe = mFontEntry->Family()->FindFontForStyle(style, needsBold);
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if (!fe || fe == mFontEntry) {
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return PR_FALSE;
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}
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nsRefPtr<gfxFont> font = fe->FindOrMakeFont(&style, needsBold);
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gfxDWriteFont *dwFont = static_cast<gfxDWriteFont*>(font.get());
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dwFont->mFontFace->GetMetrics(aFontMetrics);
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return PR_TRUE;
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}
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void
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gfxDWriteFont::ComputeMetrics()
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{
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DWRITE_FONT_METRICS fontMetrics;
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if (!(mFontEntry->Weight() == 900 &&
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!mFontEntry->IsUserFont() &&
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mFontEntry->FamilyName().EqualsLiteral("Arial") &&
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GetFakeMetricsForArialBlack(&fontMetrics)))
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{
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mFontFace->GetMetrics(&fontMetrics);
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}
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if (mStyle.sizeAdjust != 0.0) {
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gfxFloat aspect = (gfxFloat)fontMetrics.xHeight /
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fontMetrics.designUnitsPerEm;
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mAdjustedSize = mStyle.GetAdjustedSize(aspect);
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} else {
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mAdjustedSize = mStyle.size;
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}
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gfxDWriteFontEntry *fe =
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static_cast<gfxDWriteFontEntry*>(mFontEntry.get());
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if (fe->IsCJKFont() && HasBitmapStrikeForSize(NS_lround(mAdjustedSize))) {
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mAdjustedSize = NS_lround(mAdjustedSize);
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mUseSubpixelPositions = PR_FALSE;
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// if we have bitmaps, we need to tell Cairo NOT to use subpixel AA,
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// to avoid the manual-subpixel codepath in cairo-d2d-surface.cpp
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// which fails to render bitmap glyphs (see bug 626299).
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// This option will be passed to the cairo_dwrite_scaled_font_t
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// after creation.
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mAllowManualShowGlyphs = PR_FALSE;
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}
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mMetrics = new gfxFont::Metrics;
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::memset(mMetrics, 0, sizeof(*mMetrics));
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mMetrics->xHeight =
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((gfxFloat)fontMetrics.xHeight /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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mMetrics->maxAscent =
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ceil(((gfxFloat)fontMetrics.ascent /
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fontMetrics.designUnitsPerEm) * mAdjustedSize);
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mMetrics->maxDescent =
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ceil(((gfxFloat)fontMetrics.descent /
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fontMetrics.designUnitsPerEm) * mAdjustedSize);
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mMetrics->maxHeight = mMetrics->maxAscent + mMetrics->maxDescent;
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mMetrics->emHeight = mAdjustedSize;
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mMetrics->emAscent = mMetrics->emHeight *
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mMetrics->maxAscent / mMetrics->maxHeight;
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mMetrics->emDescent = mMetrics->emHeight - mMetrics->emAscent;
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mMetrics->maxAdvance = mAdjustedSize;
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// try to get the true maxAdvance value from 'hhea'
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PRUint8 *tableData;
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PRUint32 len;
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void *tableContext = NULL;
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BOOL exists;
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HRESULT hr =
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mFontFace->TryGetFontTable(DWRITE_MAKE_OPENTYPE_TAG('h', 'h', 'e', 'a'),
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(const void**)&tableData,
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&len,
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&tableContext,
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&exists);
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if (SUCCEEDED(hr)) {
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if (exists && len >= sizeof(mozilla::HheaTable)) {
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const mozilla::HheaTable* hhea =
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reinterpret_cast<const mozilla::HheaTable*>(tableData);
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mMetrics->maxAdvance = ((gfxFloat)PRUint16(hhea->advanceWidthMax) /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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}
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mFontFace->ReleaseFontTable(tableContext);
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}
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mMetrics->internalLeading = NS_MAX(mMetrics->maxHeight - mMetrics->emHeight, 0.0);
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mMetrics->externalLeading =
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ceil(((gfxFloat)fontMetrics.lineGap /
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fontMetrics.designUnitsPerEm) * mAdjustedSize);
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UINT16 glyph = (PRUint16)GetSpaceGlyph();
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DWRITE_GLYPH_METRICS metrics;
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mFontFace->GetDesignGlyphMetrics(&glyph, 1, &metrics);
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mMetrics->spaceWidth =
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((gfxFloat)metrics.advanceWidth /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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// try to get aveCharWidth from the OS/2 table, fall back to measuring 'x'
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// if the table is not available
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mMetrics->aveCharWidth = 0;
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hr = mFontFace->TryGetFontTable(DWRITE_MAKE_OPENTYPE_TAG('O', 'S', '/', '2'),
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(const void**)&tableData,
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&len,
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&tableContext,
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&exists);
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if (SUCCEEDED(hr)) {
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if (exists && len >= 4) {
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// Not checking against sizeof(mozilla::OS2Table) here because older
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// versions of the table have different sizes; we only need the first
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// two 16-bit fields here.
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const mozilla::OS2Table* os2 =
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reinterpret_cast<const mozilla::OS2Table*>(tableData);
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mMetrics->aveCharWidth = ((gfxFloat)PRInt16(os2->xAvgCharWidth) /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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}
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mFontFace->ReleaseFontTable(tableContext);
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}
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UINT32 ucs;
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if (mMetrics->aveCharWidth < 1) {
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ucs = L'x';
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if (SUCCEEDED(mFontFace->GetGlyphIndicesA(&ucs, 1, &glyph)) &&
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SUCCEEDED(mFontFace->GetDesignGlyphMetrics(&glyph, 1, &metrics))) {
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mMetrics->aveCharWidth =
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((gfxFloat)metrics.advanceWidth /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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} else {
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// Let's just assume the X is square.
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mMetrics->aveCharWidth =
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((gfxFloat)fontMetrics.xHeight /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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}
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}
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ucs = L'0';
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if (SUCCEEDED(mFontFace->GetGlyphIndicesA(&ucs, 1, &glyph)) &&
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SUCCEEDED(mFontFace->GetDesignGlyphMetrics(&glyph, 1, &metrics))) {
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mMetrics->zeroOrAveCharWidth =
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((gfxFloat)metrics.advanceWidth /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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} else {
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mMetrics->zeroOrAveCharWidth = mMetrics->aveCharWidth;
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}
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mMetrics->underlineOffset =
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((gfxFloat)fontMetrics.underlinePosition /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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mMetrics->underlineSize =
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((gfxFloat)fontMetrics.underlineThickness /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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mMetrics->strikeoutOffset =
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((gfxFloat)fontMetrics.strikethroughPosition /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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mMetrics->strikeoutSize =
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((gfxFloat)fontMetrics.strikethroughThickness /
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fontMetrics.designUnitsPerEm) * mAdjustedSize;
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mMetrics->superscriptOffset = 0;
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mMetrics->subscriptOffset = 0;
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mFUnitsConvFactor = float(mAdjustedSize / fontMetrics.designUnitsPerEm);
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SanitizeMetrics(mMetrics, GetFontEntry()->mIsBadUnderlineFont);
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#if 0
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printf("Font: %p (%s) size: %f\n", this,
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NS_ConvertUTF16toUTF8(GetName()).get(), mStyle.size);
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printf(" emHeight: %f emAscent: %f emDescent: %f\n", mMetrics->emHeight, mMetrics->emAscent, mMetrics->emDescent);
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printf(" maxAscent: %f maxDescent: %f maxAdvance: %f\n", mMetrics->maxAscent, mMetrics->maxDescent, mMetrics->maxAdvance);
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printf(" internalLeading: %f externalLeading: %f\n", mMetrics->internalLeading, mMetrics->externalLeading);
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printf(" spaceWidth: %f aveCharWidth: %f zeroOrAve: %f xHeight: %f\n",
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mMetrics->spaceWidth, mMetrics->aveCharWidth, mMetrics->zeroOrAveCharWidth, mMetrics->xHeight);
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printf(" uOff: %f uSize: %f stOff: %f stSize: %f supOff: %f subOff: %f\n",
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mMetrics->underlineOffset, mMetrics->underlineSize, mMetrics->strikeoutOffset, mMetrics->strikeoutSize,
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mMetrics->superscriptOffset, mMetrics->subscriptOffset);
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#endif
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}
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using namespace mozilla; // for AutoSwap_* types
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struct EBLCHeader {
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AutoSwap_PRUint32 version;
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AutoSwap_PRUint32 numSizes;
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};
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struct SbitLineMetrics {
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PRInt8 ascender;
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PRInt8 descender;
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PRUint8 widthMax;
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PRInt8 caretSlopeNumerator;
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PRInt8 caretSlopeDenominator;
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PRInt8 caretOffset;
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PRInt8 minOriginSB;
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PRInt8 minAdvanceSB;
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PRInt8 maxBeforeBL;
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PRInt8 minAfterBL;
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PRInt8 pad1;
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PRInt8 pad2;
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};
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struct BitmapSizeTable {
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AutoSwap_PRUint32 indexSubTableArrayOffset;
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AutoSwap_PRUint32 indexTablesSize;
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AutoSwap_PRUint32 numberOfIndexSubTables;
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AutoSwap_PRUint32 colorRef;
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SbitLineMetrics hori;
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SbitLineMetrics vert;
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AutoSwap_PRUint16 startGlyphIndex;
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AutoSwap_PRUint16 endGlyphIndex;
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PRUint8 ppemX;
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PRUint8 ppemY;
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PRUint8 bitDepth;
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PRUint8 flags;
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};
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typedef EBLCHeader EBSCHeader;
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struct BitmapScaleTable {
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SbitLineMetrics hori;
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SbitLineMetrics vert;
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PRUint8 ppemX;
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PRUint8 ppemY;
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PRUint8 substitutePpemX;
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PRUint8 substitutePpemY;
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};
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PRBool
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gfxDWriteFont::HasBitmapStrikeForSize(PRUint32 aSize)
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{
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PRUint8 *tableData;
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PRUint32 len;
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void *tableContext;
|
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BOOL exists;
|
|
HRESULT hr =
|
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mFontFace->TryGetFontTable(DWRITE_MAKE_OPENTYPE_TAG('E', 'B', 'L', 'C'),
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(const void**)&tableData, &len,
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&tableContext, &exists);
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if (FAILED(hr)) {
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return PR_FALSE;
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}
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|
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PRBool hasStrike = PR_FALSE;
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// not really a loop, but this lets us use 'break' to skip out of the block
|
|
// as soon as we know the answer, and skips it altogether if the table is
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// not present
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|
while (exists) {
|
|
if (len < sizeof(EBLCHeader)) {
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break;
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}
|
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const EBLCHeader *hdr = reinterpret_cast<const EBLCHeader*>(tableData);
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|
if (hdr->version != 0x00020000) {
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break;
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}
|
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PRUint32 numSizes = hdr->numSizes;
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if (numSizes > 0xffff) { // sanity-check, prevent overflow below
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break;
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}
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if (len < sizeof(EBLCHeader) + numSizes * sizeof(BitmapSizeTable)) {
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break;
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}
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const BitmapSizeTable *sizeTable =
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reinterpret_cast<const BitmapSizeTable*>(hdr + 1);
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|
for (PRUint32 i = 0; i < numSizes; ++i, ++sizeTable) {
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|
if (sizeTable->ppemX == aSize && sizeTable->ppemY == aSize) {
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|
// we ignore a strike that contains fewer than 4 glyphs,
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|
// as that probably indicates a font such as Courier New
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|
// that provides bitmaps ONLY for the "shading" characters
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|
// U+2591..2593
|
|
hasStrike = (PRUint16(sizeTable->endGlyphIndex) >=
|
|
PRUint16(sizeTable->startGlyphIndex) + 3);
|
|
break;
|
|
}
|
|
}
|
|
// if we reach here, we didn't find a strike; unconditionally break
|
|
// out of the while-loop block
|
|
break;
|
|
}
|
|
mFontFace->ReleaseFontTable(tableContext);
|
|
|
|
if (hasStrike) {
|
|
return PR_TRUE;
|
|
}
|
|
|
|
// if we didn't find a real strike, check if the font calls for scaling
|
|
// another bitmap to this size
|
|
hr = mFontFace->TryGetFontTable(DWRITE_MAKE_OPENTYPE_TAG('E', 'B', 'S', 'C'),
|
|
(const void**)&tableData, &len,
|
|
&tableContext, &exists);
|
|
if (FAILED(hr)) {
|
|
return PR_FALSE;
|
|
}
|
|
|
|
while (exists) {
|
|
if (len < sizeof(EBSCHeader)) {
|
|
break;
|
|
}
|
|
const EBSCHeader *hdr = reinterpret_cast<const EBSCHeader*>(tableData);
|
|
if (hdr->version != 0x00020000) {
|
|
break;
|
|
}
|
|
PRUint32 numSizes = hdr->numSizes;
|
|
if (numSizes > 0xffff) {
|
|
break;
|
|
}
|
|
if (len < sizeof(EBSCHeader) + numSizes * sizeof(BitmapScaleTable)) {
|
|
break;
|
|
}
|
|
const BitmapScaleTable *scaleTable =
|
|
reinterpret_cast<const BitmapScaleTable*>(hdr + 1);
|
|
for (PRUint32 i = 0; i < numSizes; ++i, ++scaleTable) {
|
|
if (scaleTable->ppemX == aSize && scaleTable->ppemY == aSize) {
|
|
hasStrike = PR_TRUE;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
mFontFace->ReleaseFontTable(tableContext);
|
|
|
|
return hasStrike;
|
|
}
|
|
|
|
PRUint32
|
|
gfxDWriteFont::GetSpaceGlyph()
|
|
{
|
|
UINT32 ucs = L' ';
|
|
UINT16 glyph;
|
|
HRESULT hr;
|
|
hr = mFontFace->GetGlyphIndicesA(&ucs, 1, &glyph);
|
|
if (FAILED(hr)) {
|
|
return 0;
|
|
}
|
|
return glyph;
|
|
}
|
|
|
|
PRBool
|
|
gfxDWriteFont::SetupCairoFont(gfxContext *aContext)
|
|
{
|
|
cairo_scaled_font_t *scaledFont = CairoScaledFont();
|
|
if (cairo_scaled_font_status(scaledFont) != CAIRO_STATUS_SUCCESS) {
|
|
// Don't cairo_set_scaled_font as that would propagate the error to
|
|
// the cairo_t, precluding any further drawing.
|
|
return PR_FALSE;
|
|
}
|
|
cairo_set_scaled_font(aContext->GetCairo(), scaledFont);
|
|
return PR_TRUE;
|
|
}
|
|
|
|
PRBool
|
|
gfxDWriteFont::IsValid()
|
|
{
|
|
return mFontFace != NULL;
|
|
}
|
|
|
|
IDWriteFontFace*
|
|
gfxDWriteFont::GetFontFace()
|
|
{
|
|
return mFontFace.get();
|
|
}
|
|
|
|
cairo_font_face_t *
|
|
gfxDWriteFont::CairoFontFace()
|
|
{
|
|
if (!mCairoFontFace) {
|
|
#ifdef CAIRO_HAS_DWRITE_FONT
|
|
mCairoFontFace =
|
|
cairo_dwrite_font_face_create_for_dwrite_fontface(
|
|
((gfxDWriteFontEntry*)mFontEntry.get())->mFont, mFontFace);
|
|
#endif
|
|
}
|
|
return mCairoFontFace;
|
|
}
|
|
|
|
|
|
cairo_scaled_font_t *
|
|
gfxDWriteFont::CairoScaledFont()
|
|
{
|
|
if (!mCairoScaledFont) {
|
|
cairo_matrix_t sizeMatrix;
|
|
cairo_matrix_t identityMatrix;
|
|
|
|
cairo_matrix_init_scale(&sizeMatrix, mAdjustedSize, mAdjustedSize);
|
|
cairo_matrix_init_identity(&identityMatrix);
|
|
|
|
cairo_font_options_t *fontOptions = cairo_font_options_create();
|
|
if (mNeedsOblique) {
|
|
double skewfactor = OBLIQUE_SKEW_FACTOR;
|
|
|
|
cairo_matrix_t style;
|
|
cairo_matrix_init(&style,
|
|
1, //xx
|
|
0, //yx
|
|
-1 * skewfactor, //xy
|
|
1, //yy
|
|
0, //x0
|
|
0); //y0
|
|
cairo_matrix_multiply(&sizeMatrix, &sizeMatrix, &style);
|
|
}
|
|
|
|
if (mAntialiasOption != kAntialiasDefault) {
|
|
cairo_font_options_set_antialias(fontOptions,
|
|
GetCairoAntialiasOption(mAntialiasOption));
|
|
}
|
|
|
|
mCairoScaledFont = cairo_scaled_font_create(CairoFontFace(),
|
|
&sizeMatrix,
|
|
&identityMatrix,
|
|
fontOptions);
|
|
cairo_font_options_destroy(fontOptions);
|
|
|
|
cairo_dwrite_scaled_font_allow_manual_show_glyphs(mCairoScaledFont,
|
|
mAllowManualShowGlyphs);
|
|
}
|
|
|
|
NS_ASSERTION(mAdjustedSize == 0.0 ||
|
|
cairo_scaled_font_status(mCairoScaledFont)
|
|
== CAIRO_STATUS_SUCCESS,
|
|
"Failed to make scaled font");
|
|
|
|
return mCairoScaledFont;
|
|
}
|
|
|
|
// Access to font tables packaged in hb_blob_t form
|
|
|
|
// object attached to the Harfbuzz blob, used to release
|
|
// the table when the blob is destroyed
|
|
class FontTableRec {
|
|
public:
|
|
FontTableRec(IDWriteFontFace *aFontFace, void *aContext)
|
|
: mFontFace(aFontFace), mContext(aContext)
|
|
{ }
|
|
|
|
~FontTableRec() {
|
|
mFontFace->ReleaseFontTable(mContext);
|
|
}
|
|
|
|
private:
|
|
IDWriteFontFace *mFontFace;
|
|
void *mContext;
|
|
};
|
|
|
|
/*static*/ void
|
|
gfxDWriteFont::DestroyBlobFunc(void* aUserData)
|
|
{
|
|
FontTableRec *ftr = static_cast<FontTableRec*>(aUserData);
|
|
delete ftr;
|
|
}
|
|
|
|
hb_blob_t *
|
|
gfxDWriteFont::GetFontTable(PRUint32 aTag)
|
|
{
|
|
const void *data;
|
|
UINT32 size;
|
|
void *context;
|
|
BOOL exists;
|
|
HRESULT hr = mFontFace->TryGetFontTable(NS_SWAP32(aTag),
|
|
&data, &size, &context, &exists);
|
|
if (SUCCEEDED(hr) && exists) {
|
|
FontTableRec *ftr = new FontTableRec(mFontFace, context);
|
|
return hb_blob_create(static_cast<const char*>(data), size,
|
|
HB_MEMORY_MODE_READONLY,
|
|
DestroyBlobFunc, ftr);
|
|
}
|
|
|
|
if (mFontEntry->IsUserFont() && !mFontEntry->IsLocalUserFont()) {
|
|
// for downloaded fonts, there may be layout tables cached in the entry
|
|
// even though they're absent from the sanitized platform font
|
|
hb_blob_t *blob;
|
|
if (mFontEntry->GetExistingFontTable(aTag, &blob)) {
|
|
return blob;
|
|
}
|
|
}
|
|
|
|
return nsnull;
|
|
}
|
|
|
|
PRBool
|
|
gfxDWriteFont::ProvidesGlyphWidths()
|
|
{
|
|
return !mUseSubpixelPositions ||
|
|
(mFontFace->GetSimulations() & DWRITE_FONT_SIMULATIONS_BOLD);
|
|
}
|
|
|
|
PRInt32
|
|
gfxDWriteFont::GetGlyphWidth(gfxContext *aCtx, PRUint16 aGID)
|
|
{
|
|
if (!mGlyphWidths.IsInitialized()) {
|
|
mGlyphWidths.Init(200);
|
|
}
|
|
|
|
PRInt32 width = -1;
|
|
if (mGlyphWidths.Get(aGID, &width)) {
|
|
return width;
|
|
}
|
|
|
|
DWRITE_GLYPH_METRICS glyphMetrics;
|
|
HRESULT hr;
|
|
if (mUseSubpixelPositions) {
|
|
hr = mFontFace->GetDesignGlyphMetrics(
|
|
&aGID, 1, &glyphMetrics, FALSE);
|
|
if (SUCCEEDED(hr)) {
|
|
width =
|
|
NS_lround(glyphMetrics.advanceWidth * mFUnitsConvFactor *
|
|
65536.0);
|
|
}
|
|
} else {
|
|
hr = mFontFace->GetGdiCompatibleGlyphMetrics(
|
|
FLOAT(mAdjustedSize), 1.0f, nsnull, FALSE,
|
|
&aGID, 1, &glyphMetrics, FALSE);
|
|
if (SUCCEEDED(hr)) {
|
|
width =
|
|
NS_lround(glyphMetrics.advanceWidth * mFUnitsConvFactor) << 16;
|
|
}
|
|
}
|
|
|
|
mGlyphWidths.Put(aGID, width);
|
|
return width;
|
|
}
|