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gecko-dev/gfx/thebes/gfxDWriteFonts.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "gfxDWriteFonts.h"
#include <algorithm>
#include "gfxDWriteFontList.h"
#include "gfxContext.h"
#include "gfxTextRun.h"
#include "harfbuzz/hb.h"
#include "mozilla/FontPropertyTypes.h"
using namespace mozilla;
using namespace mozilla::gfx;
// This is also in gfxGDIFont.cpp. Would be nice to put it somewhere common,
// but we can't declare it in the gfxFont.h or gfxFontUtils.h headers
// because those are exported, and the cairo headers aren't.
static inline cairo_antialias_t
GetCairoAntialiasOption(gfxFont::AntialiasOption anAntialiasOption)
{
switch (anAntialiasOption) {
default:
case gfxFont::kAntialiasDefault:
return CAIRO_ANTIALIAS_DEFAULT;
case gfxFont::kAntialiasNone:
return CAIRO_ANTIALIAS_NONE;
case gfxFont::kAntialiasGrayscale:
return CAIRO_ANTIALIAS_GRAY;
case gfxFont::kAntialiasSubpixel:
return CAIRO_ANTIALIAS_SUBPIXEL;
}
}
// Code to determine whether Windows is set to use ClearType font smoothing;
// based on private functions in cairo-win32-font.c
#ifndef SPI_GETFONTSMOOTHINGTYPE
#define SPI_GETFONTSMOOTHINGTYPE 0x200a
#endif
#ifndef FE_FONTSMOOTHINGCLEARTYPE
#define FE_FONTSMOOTHINGCLEARTYPE 2
#endif
bool gfxDWriteFont::sUseClearType = true;
// This function is expensive so we only want to call it when we have to.
static bool
UsingClearType()
{
BOOL fontSmoothing;
if (!SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &fontSmoothing, 0) ||
!fontSmoothing)
{
return false;
}
UINT type;
if (SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &type, 0) &&
type == FE_FONTSMOOTHINGCLEARTYPE)
{
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
// gfxDWriteFont
gfxDWriteFont::gfxDWriteFont(const RefPtr<UnscaledFontDWrite>& aUnscaledFont,
gfxFontEntry *aFontEntry,
const gfxFontStyle *aFontStyle,
bool aNeedsBold,
AntialiasOption anAAOption)
: gfxFont(aUnscaledFont, aFontEntry, aFontStyle, anAAOption)
, mCairoFontFace(nullptr)
, mMetrics(nullptr)
, mSpaceGlyph(0)
, mNeedsBold(aNeedsBold)
, mUseSubpixelPositions(false)
, mAllowManualShowGlyphs(true)
, mAzureScaledFontUsedClearType(false)
{
mFontFace = aUnscaledFont->GetFontFace();
// If the IDWriteFontFace1 interface is available, we can use that for
// faster glyph width retrieval.
mFontFace->QueryInterface(__uuidof(IDWriteFontFace1),
(void**)getter_AddRefs(mFontFace1));
ComputeMetrics(anAAOption);
}
gfxDWriteFont::~gfxDWriteFont()
{
if (mCairoFontFace) {
cairo_font_face_destroy(mCairoFontFace);
}
if (mScaledFont) {
cairo_scaled_font_destroy(mScaledFont);
}
delete mMetrics;
}
void
gfxDWriteFont::UpdateClearTypeUsage()
{
Factory::UpdateSystemTextQuality();
// Check if ClearType status has changed; if so, toggle our flag,
// flush cached stuff that depended on the old setting, and force
// reflow everywhere to ensure we are using correct glyph metrics.
if (sUseClearType != UsingClearType()) {
sUseClearType = !sUseClearType;
gfxPlatform::FlushFontAndWordCaches();
gfxPlatform::ForceGlobalReflow();
}
}
UniquePtr<gfxFont>
gfxDWriteFont::CopyWithAntialiasOption(AntialiasOption anAAOption)
{
auto entry = static_cast<gfxDWriteFontEntry*>(mFontEntry.get());
RefPtr<UnscaledFontDWrite> unscaledFont = static_cast<UnscaledFontDWrite*>(mUnscaledFont.get());
return MakeUnique<gfxDWriteFont>(unscaledFont, entry, &mStyle, mNeedsBold, anAAOption);
}
const gfxFont::Metrics&
gfxDWriteFont::GetHorizontalMetrics()
{
return *mMetrics;
}
bool
gfxDWriteFont::GetFakeMetricsForArialBlack(DWRITE_FONT_METRICS *aFontMetrics)
{
gfxFontStyle style(mStyle);
style.weight = FontWeight(700);
bool needsBold;
gfxFontEntry* fe =
gfxPlatformFontList::PlatformFontList()->
FindFontForFamily(NS_LITERAL_STRING("Arial"), &style, needsBold);
if (!fe || fe == mFontEntry) {
return false;
}
RefPtr<gfxFont> font = fe->FindOrMakeFont(&style, needsBold);
gfxDWriteFont *dwFont = static_cast<gfxDWriteFont*>(font.get());
dwFont->mFontFace->GetMetrics(aFontMetrics);
return true;
}
void
gfxDWriteFont::ComputeMetrics(AntialiasOption anAAOption)
{
DWRITE_FONT_METRICS fontMetrics;
if (!(mFontEntry->Weight() == FontWeight(900) &&
!mFontEntry->IsUserFont() &&
mFontEntry->Name().EqualsLiteral("Arial Black") &&
GetFakeMetricsForArialBlack(&fontMetrics)))
{
mFontFace->GetMetrics(&fontMetrics);
}
if (mStyle.sizeAdjust >= 0.0) {
gfxFloat aspect = (gfxFloat)fontMetrics.xHeight /
fontMetrics.designUnitsPerEm;
mAdjustedSize = mStyle.GetAdjustedSize(aspect);
} else {
mAdjustedSize = mStyle.size;
}
// Note that GetMeasuringMode depends on mAdjustedSize
if ((anAAOption == gfxFont::kAntialiasDefault &&
sUseClearType &&
GetMeasuringMode() == DWRITE_MEASURING_MODE_NATURAL) ||
anAAOption == gfxFont::kAntialiasSubpixel)
{
mUseSubpixelPositions = true;
// note that this may be reset to FALSE if we determine that a bitmap
// strike is going to be used
}
gfxDWriteFontEntry *fe =
static_cast<gfxDWriteFontEntry*>(mFontEntry.get());
if (fe->IsCJKFont() && HasBitmapStrikeForSize(NS_lround(mAdjustedSize))) {
mAdjustedSize = NS_lround(mAdjustedSize);
mUseSubpixelPositions = false;
// if we have bitmaps, we need to tell Cairo NOT to use subpixel AA,
// to avoid the manual-subpixel codepath in cairo-d2d-surface.cpp
// which fails to render bitmap glyphs (see bug 626299).
// This option will be passed to the cairo_dwrite_scaled_font_t
// after creation.
mAllowManualShowGlyphs = false;
}
mMetrics = new gfxFont::Metrics;
::memset(mMetrics, 0, sizeof(*mMetrics));
mFUnitsConvFactor = float(mAdjustedSize / fontMetrics.designUnitsPerEm);
mMetrics->xHeight = fontMetrics.xHeight * mFUnitsConvFactor;
mMetrics->capHeight = fontMetrics.capHeight * mFUnitsConvFactor;
mMetrics->maxAscent = ceil(fontMetrics.ascent * mFUnitsConvFactor);
mMetrics->maxDescent = ceil(fontMetrics.descent * mFUnitsConvFactor);
mMetrics->maxHeight = mMetrics->maxAscent + mMetrics->maxDescent;
mMetrics->emHeight = mAdjustedSize;
mMetrics->emAscent = mMetrics->emHeight *
mMetrics->maxAscent / mMetrics->maxHeight;
mMetrics->emDescent = mMetrics->emHeight - mMetrics->emAscent;
mMetrics->maxAdvance = mAdjustedSize;
// try to get the true maxAdvance value from 'hhea'
gfxFontEntry::AutoTable hheaTable(GetFontEntry(),
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)) {
mMetrics->maxAdvance =
uint16_t(hhea->advanceWidthMax) * mFUnitsConvFactor;
}
}
mMetrics->internalLeading = std::max(mMetrics->maxHeight - mMetrics->emHeight, 0.0);
mMetrics->externalLeading = ceil(fontMetrics.lineGap * mFUnitsConvFactor);
UINT32 ucs = L' ';
UINT16 glyph;
HRESULT hr = mFontFace->GetGlyphIndicesW(&ucs, 1, &glyph);
if (FAILED(hr)) {
mMetrics->spaceWidth = 0;
} else {
mSpaceGlyph = glyph;
mMetrics->spaceWidth = MeasureGlyphWidth(glyph);
}
// try to get aveCharWidth from the OS/2 table, fall back to measuring 'x'
// if the table is not available or if using hinted/pixel-snapped widths
if (mUseSubpixelPositions) {
mMetrics->aveCharWidth = 0;
gfxFontEntry::AutoTable os2Table(GetFontEntry(),
TRUETYPE_TAG('O','S','/','2'));
if (os2Table) {
uint32_t len;
const OS2Table* os2 =
reinterpret_cast<const OS2Table*>(hb_blob_get_data(os2Table, &len));
if (len >= 4) {
// Not checking against sizeof(mozilla::OS2Table) here because older
// versions of the table have different sizes; we only need the first
// two 16-bit fields here.
mMetrics->aveCharWidth =
int16_t(os2->xAvgCharWidth) * mFUnitsConvFactor;
}
}
}
if (mMetrics->aveCharWidth < 1) {
ucs = L'x';
if (SUCCEEDED(mFontFace->GetGlyphIndicesW(&ucs, 1, &glyph))) {
mMetrics->aveCharWidth = MeasureGlyphWidth(glyph);
}
if (mMetrics->aveCharWidth < 1) {
// Let's just assume the X is square.
mMetrics->aveCharWidth = fontMetrics.xHeight * mFUnitsConvFactor;
}
}
ucs = L'0';
if (SUCCEEDED(mFontFace->GetGlyphIndicesW(&ucs, 1, &glyph))) {
mMetrics->zeroOrAveCharWidth = MeasureGlyphWidth(glyph);
}
if (mMetrics->zeroOrAveCharWidth < 1) {
mMetrics->zeroOrAveCharWidth = mMetrics->aveCharWidth;
}
mMetrics->underlineOffset =
fontMetrics.underlinePosition * mFUnitsConvFactor;
mMetrics->underlineSize =
fontMetrics.underlineThickness * mFUnitsConvFactor;
mMetrics->strikeoutOffset =
fontMetrics.strikethroughPosition * mFUnitsConvFactor;
mMetrics->strikeoutSize =
fontMetrics.strikethroughThickness * mFUnitsConvFactor;
SanitizeMetrics(mMetrics, GetFontEntry()->mIsBadUnderlineFont);
#if 0
printf("Font: %p (%s) size: %f\n", this,
NS_ConvertUTF16toUTF8(GetName()).get(), mStyle.size);
printf(" emHeight: %f emAscent: %f emDescent: %f\n", mMetrics->emHeight, mMetrics->emAscent, mMetrics->emDescent);
printf(" maxAscent: %f maxDescent: %f maxAdvance: %f\n", mMetrics->maxAscent, mMetrics->maxDescent, mMetrics->maxAdvance);
printf(" internalLeading: %f externalLeading: %f\n", mMetrics->internalLeading, mMetrics->externalLeading);
printf(" spaceWidth: %f aveCharWidth: %f zeroOrAve: %f\n",
mMetrics->spaceWidth, mMetrics->aveCharWidth, mMetrics->zeroOrAveCharWidth);
printf(" xHeight: %f capHeight: %f\n", mMetrics->xHeight, mMetrics->capHeight);
printf(" uOff: %f uSize: %f stOff: %f stSize: %f\n",
mMetrics->underlineOffset, mMetrics->underlineSize, mMetrics->strikeoutOffset, mMetrics->strikeoutSize);
#endif
}
using namespace mozilla; // for AutoSwap_* types
struct EBLCHeader {
AutoSwap_PRUint32 version;
AutoSwap_PRUint32 numSizes;
};
struct SbitLineMetrics {
int8_t ascender;
int8_t descender;
uint8_t widthMax;
int8_t caretSlopeNumerator;
int8_t caretSlopeDenominator;
int8_t caretOffset;
int8_t minOriginSB;
int8_t minAdvanceSB;
int8_t maxBeforeBL;
int8_t minAfterBL;
int8_t pad1;
int8_t pad2;
};
struct BitmapSizeTable {
AutoSwap_PRUint32 indexSubTableArrayOffset;
AutoSwap_PRUint32 indexTablesSize;
AutoSwap_PRUint32 numberOfIndexSubTables;
AutoSwap_PRUint32 colorRef;
SbitLineMetrics hori;
SbitLineMetrics vert;
AutoSwap_PRUint16 startGlyphIndex;
AutoSwap_PRUint16 endGlyphIndex;
uint8_t ppemX;
uint8_t ppemY;
uint8_t bitDepth;
uint8_t flags;
};
typedef EBLCHeader EBSCHeader;
struct BitmapScaleTable {
SbitLineMetrics hori;
SbitLineMetrics vert;
uint8_t ppemX;
uint8_t ppemY;
uint8_t substitutePpemX;
uint8_t substitutePpemY;
};
bool
gfxDWriteFont::HasBitmapStrikeForSize(uint32_t aSize)
{
uint8_t *tableData;
uint32_t len;
void *tableContext;
BOOL exists;
HRESULT hr =
mFontFace->TryGetFontTable(DWRITE_MAKE_OPENTYPE_TAG('E', 'B', 'L', 'C'),
(const void**)&tableData, &len,
&tableContext, &exists);
if (FAILED(hr)) {
return false;
}
bool hasStrike = false;
// 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
// not present
while (exists) {
if (len < sizeof(EBLCHeader)) {
break;
}
const EBLCHeader *hdr = reinterpret_cast<const EBLCHeader*>(tableData);
if (hdr->version != 0x00020000) {
break;
}
uint32_t numSizes = hdr->numSizes;
if (numSizes > 0xffff) { // sanity-check, prevent overflow below
break;
}
if (len < sizeof(EBLCHeader) + numSizes * sizeof(BitmapSizeTable)) {
break;
}
const BitmapSizeTable *sizeTable =
reinterpret_cast<const BitmapSizeTable*>(hdr + 1);
for (uint32_t i = 0; i < numSizes; ++i, ++sizeTable) {
if (sizeTable->ppemX == aSize && sizeTable->ppemY == aSize) {
// we ignore a strike that contains fewer than 4 glyphs,
// as that probably indicates a font such as Courier New
// that provides bitmaps ONLY for the "shading" characters
// U+2591..2593
hasStrike = (uint16_t(sizeTable->endGlyphIndex) >=
uint16_t(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 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 false;
}
while (exists) {
if (len < sizeof(EBSCHeader)) {
break;
}
const EBSCHeader *hdr = reinterpret_cast<const EBSCHeader*>(tableData);
if (hdr->version != 0x00020000) {
break;
}
uint32_t 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 (uint32_t i = 0; i < numSizes; ++i, ++scaleTable) {
if (scaleTable->ppemX == aSize && scaleTable->ppemY == aSize) {
hasStrike = true;
break;
}
}
break;
}
mFontFace->ReleaseFontTable(tableContext);
return hasStrike;
}
uint32_t
gfxDWriteFont::GetSpaceGlyph()
{
return mSpaceGlyph;
}
bool
gfxDWriteFont::SetupCairoFont(DrawTarget* aDrawTarget)
{
cairo_scaled_font_t *scaledFont = InitCairoScaledFont();
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 false;
}
cairo_set_scaled_font(gfxFont::RefCairo(aDrawTarget), scaledFont);
return true;
}
bool
gfxDWriteFont::IsValid() const
{
return mFontFace != nullptr;
}
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::InitCairoScaledFont()
{
if (!mScaledFont) {
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 (mAntialiasOption != kAntialiasDefault) {
cairo_font_options_set_antialias(fontOptions,
GetCairoAntialiasOption(mAntialiasOption));
}
mScaledFont = cairo_scaled_font_create(CairoFontFace(),
&sizeMatrix,
&identityMatrix,
fontOptions);
cairo_font_options_destroy(fontOptions);
cairo_dwrite_scaled_font_allow_manual_show_glyphs(mScaledFont,
mAllowManualShowGlyphs);
cairo_dwrite_scaled_font_set_force_GDI_classic(mScaledFont,
GetForceGDIClassic());
}
NS_ASSERTION(mAdjustedSize == 0.0 ||
cairo_scaled_font_status(mScaledFont)
== CAIRO_STATUS_SUCCESS,
"Failed to make scaled font");
return mScaledFont;
}
gfxFont::RunMetrics
gfxDWriteFont::Measure(const gfxTextRun* aTextRun,
uint32_t aStart, uint32_t aEnd,
BoundingBoxType aBoundingBoxType,
DrawTarget* aRefDrawTarget,
Spacing* aSpacing,
gfx::ShapedTextFlags aOrientation)
{
gfxFont::RunMetrics metrics =
gfxFont::Measure(aTextRun, aStart, aEnd, aBoundingBoxType,
aRefDrawTarget, aSpacing, aOrientation);
// if aBoundingBoxType is LOOSE_INK_EXTENTS
// and the underlying cairo font may be antialiased,
// we can't trust Windows to have considered all the pixels
// so we need to add "padding" to the bounds.
// (see bugs 475968, 439831, compare also bug 445087)
if (aBoundingBoxType == LOOSE_INK_EXTENTS &&
mAntialiasOption != kAntialiasNone &&
GetMeasuringMode() == DWRITE_MEASURING_MODE_GDI_CLASSIC &&
metrics.mBoundingBox.Width() > 0) {
metrics.mBoundingBox.MoveByX(-aTextRun->GetAppUnitsPerDevUnit());
metrics.mBoundingBox.SetWidth(metrics.mBoundingBox.Width() + aTextRun->GetAppUnitsPerDevUnit() * 3);
}
return metrics;
}
bool
gfxDWriteFont::ProvidesGlyphWidths() const
{
return !mUseSubpixelPositions ||
(mFontFace->GetSimulations() & DWRITE_FONT_SIMULATIONS_BOLD) ||
(((gfxDWriteFontEntry*)(GetFontEntry()))->HasVariations() &&
!mStyle.variationSettings.IsEmpty());
}
int32_t
gfxDWriteFont::GetGlyphWidth(DrawTarget& aDrawTarget, uint16_t aGID)
{
if (!mGlyphWidths) {
mGlyphWidths = MakeUnique<nsDataHashtable<nsUint32HashKey,int32_t>>(128);
}
int32_t width = -1;
if (mGlyphWidths->Get(aGID, &width)) {
return width;
}
width = NS_lround(MeasureGlyphWidth(aGID) * 65536.0);
mGlyphWidths->Put(aGID, width);
return width;
}
bool
gfxDWriteFont::GetForceGDIClassic()
{
return static_cast<gfxDWriteFontEntry*>(mFontEntry.get())->GetForceGDIClassic() &&
cairo_dwrite_get_cleartype_rendering_mode() < 0 &&
GetAdjustedSize() <=
gfxDWriteFontList::PlatformFontList()->GetForceGDIClassicMaxFontSize();
}
DWRITE_MEASURING_MODE
gfxDWriteFont::GetMeasuringMode()
{
return GetForceGDIClassic()
? DWRITE_MEASURING_MODE_GDI_CLASSIC
: gfxWindowsPlatform::GetPlatform()->DWriteMeasuringMode();
}
gfxFloat
gfxDWriteFont::MeasureGlyphWidth(uint16_t aGlyph)
{
HRESULT hr;
if (mFontFace1) {
int32_t advance;
if (mUseSubpixelPositions) {
hr = mFontFace1->GetDesignGlyphAdvances(1, &aGlyph, &advance, FALSE);
if (SUCCEEDED(hr)) {
return advance * mFUnitsConvFactor;
}
} else {
hr = mFontFace1->GetGdiCompatibleGlyphAdvances(
FLOAT(mAdjustedSize), 1.0f, nullptr,
GetMeasuringMode() == DWRITE_MEASURING_MODE_GDI_NATURAL,
FALSE, 1, &aGlyph, &advance);
if (SUCCEEDED(hr)) {
return NS_lround(advance * mFUnitsConvFactor);
}
}
} else {
DWRITE_GLYPH_METRICS metrics;
if (mUseSubpixelPositions) {
hr = mFontFace->GetDesignGlyphMetrics(&aGlyph, 1, &metrics, FALSE);
if (SUCCEEDED(hr)) {
return metrics.advanceWidth * mFUnitsConvFactor;
}
} else {
hr = mFontFace->GetGdiCompatibleGlyphMetrics(
FLOAT(mAdjustedSize), 1.0f, nullptr,
GetMeasuringMode() == DWRITE_MEASURING_MODE_GDI_NATURAL,
&aGlyph, 1, &metrics, FALSE);
if (SUCCEEDED(hr)) {
return NS_lround(metrics.advanceWidth * mFUnitsConvFactor);
}
}
}
return 0;
}
void
gfxDWriteFont::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const
{
gfxFont::AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
aSizes->mFontInstances += aMallocSizeOf(mMetrics);
if (mGlyphWidths) {
aSizes->mFontInstances +=
mGlyphWidths->ShallowSizeOfIncludingThis(aMallocSizeOf);
}
}
void
gfxDWriteFont::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const
{
aSizes->mFontInstances += aMallocSizeOf(this);
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
}
already_AddRefed<ScaledFont>
gfxDWriteFont::GetScaledFont(mozilla::gfx::DrawTarget *aTarget)
{
if (mAzureScaledFontUsedClearType != sUseClearType) {
mAzureScaledFont = nullptr;
}
if (!mAzureScaledFont) {
gfxDWriteFontEntry *fe =
static_cast<gfxDWriteFontEntry*>(mFontEntry.get());
bool useEmbeddedBitmap =
fe->IsCJKFont() &&
HasBitmapStrikeForSize(NS_lround(mAdjustedSize));
bool forceGDI = GetForceGDIClassic();
IDWriteRenderingParams* params = gfxWindowsPlatform::GetPlatform()->GetRenderingParams(
sUseClearType ?
(forceGDI ?
gfxWindowsPlatform::TEXT_RENDERING_GDI_CLASSIC :
gfxWindowsPlatform::TEXT_RENDERING_NORMAL) :
gfxWindowsPlatform::TEXT_RENDERING_NO_CLEARTYPE);
const gfxFontStyle* fontStyle = GetStyle();
mAzureScaledFont =
Factory::CreateScaledFontForDWriteFont(mFontFace, fontStyle,
GetUnscaledFont(),
GetAdjustedSize(),
useEmbeddedBitmap,
forceGDI,
params,
params->GetGamma(),
params->GetEnhancedContrast());
if (!mAzureScaledFont) {
return nullptr;
}
mAzureScaledFontUsedClearType = sUseClearType;
}
if (aTarget->GetBackendType() == BackendType::CAIRO) {
if (!mAzureScaledFont->GetCairoScaledFont()) {
cairo_scaled_font_t* cairoScaledFont = InitCairoScaledFont();
if (!cairoScaledFont) {
return nullptr;
}
mAzureScaledFont->SetCairoScaledFont(cairoScaledFont);
}
}
RefPtr<ScaledFont> scaledFont(mAzureScaledFont);
return scaledFont.forget();
}
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