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gecko-dev/gfx/thebes/gfxDWriteFonts.cpp
Lee Salzman 2b03a82ba0 Bug 1584268 - only instantiate Cairo fonts when drawing to Cairo target. r=jfkthame 
This removes a lot of old cruft in thebes to instantiate Cairo scaled fonts.
Instead, we only instantiate the Cairo scaled font inside Moz2D when we actually
need it for DrawTargetCairo. This thus gets rid of the duplicated code we had
inside both Moz2D and thebes to deal with Cairo scaled fonts.

Differential Revision: https://phabricator.services.mozilla.com/D47297

--HG--
extra : moz-landing-system : lando
2019-10-01 21:56:30 +00:00

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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 "mozilla/gfx/gfxVars.h"
#include "harfbuzz/hb.h"
#include "mozilla/FontPropertyTypes.h"
using namespace mozilla;
using namespace mozilla::gfx;
// 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
// Cleartype can be dynamically enabled/disabled, so we have to allow for
// dynamically updating it.
static BYTE GetSystemTextQuality() {
BOOL font_smoothing;
UINT smoothing_type;
if (!SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &font_smoothing, 0)) {
return DEFAULT_QUALITY;
}
if (font_smoothing) {
if (!SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &smoothing_type,
0)) {
return DEFAULT_QUALITY;
}
if (smoothing_type == FE_FONTSMOOTHINGCLEARTYPE) {
return CLEARTYPE_QUALITY;
}
return ANTIALIASED_QUALITY;
}
return DEFAULT_QUALITY;
}
#ifndef SPI_GETFONTSMOOTHINGCONTRAST
# define SPI_GETFONTSMOOTHINGCONTRAST 0x200c
#endif
// "Retrieves a contrast value that is used in ClearType smoothing. Valid
// contrast values are from 1000 to 2200. The default value is 1400."
static FLOAT GetSystemGDIGamma() {
static FLOAT sGDIGamma = 0.0f;
if (!sGDIGamma) {
UINT value = 0;
if (!SystemParametersInfo(SPI_GETFONTSMOOTHINGCONTRAST, 0, &value, 0) ||
value < 1000 || value > 2200) {
value = 1400;
}
sGDIGamma = value / 1000.0f;
}
return sGDIGamma;
}
////////////////////////////////////////////////////////////////////////////////
// gfxDWriteFont
gfxDWriteFont::gfxDWriteFont(const RefPtr<UnscaledFontDWrite>& aUnscaledFont,
gfxFontEntry* aFontEntry,
const gfxFontStyle* aFontStyle,
RefPtr<IDWriteFontFace> aFontFace,
AntialiasOption anAAOption)
: gfxFont(aUnscaledFont, aFontEntry, aFontStyle, anAAOption),
mFontFace(aFontFace ? aFontFace : aUnscaledFont->GetFontFace()),
mMetrics(nullptr),
mSpaceGlyph(0),
mUseSubpixelPositions(false),
mAllowManualShowGlyphs(true),
mAzureScaledFontUsedClearType(false) {
// 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() { delete mMetrics; }
static void ForceFontUpdate() {
// update device context font cache
// Dirty but easiest way:
// Changing nsIPrefBranch entry which triggers callbacks
// and flows into calling mDeviceContext->FlushFontCache()
// to update the font cache in all the instance of Browsers
static const char kPrefName[] = "font.internaluseonly.changed";
bool fontInternalChange = Preferences::GetBool(kPrefName, false);
Preferences::SetBool(kPrefName, !fontInternalChange);
}
void gfxDWriteFont::UpdateSystemTextQuality() {
BYTE newQuality = GetSystemTextQuality();
if (gfxVars::SystemTextQuality() != newQuality) {
gfxVars::SetSystemTextQuality(newQuality);
}
}
void gfxDWriteFont::SystemTextQualityChanged() {
// If ClearType status has changed, update our value,
// flush cached stuff that depended on the old setting, and force
// reflow everywhere to ensure we are using correct glyph metrics.
ForceFontUpdate();
Factory::SetSystemTextQuality(gfxVars::SystemTextQuality());
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, mFontFace,
anAAOption);
}
const gfxFont::Metrics& gfxDWriteFont::GetHorizontalMetrics() {
return *mMetrics;
}
bool gfxDWriteFont::GetFakeMetricsForArialBlack(
DWRITE_FONT_METRICS* aFontMetrics) {
gfxFontStyle style(mStyle);
style.weight = FontWeight(700);
gfxFontEntry* fe = gfxPlatformFontList::PlatformFontList()->FindFontForFamily(
NS_LITERAL_CSTRING("Arial"), &style);
if (!fe || fe == mFontEntry) {
return false;
}
RefPtr<gfxFont> font = fe->FindOrMakeFont(&style);
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().Min() == FontWeight(900) &&
mFontEntry->Weight().Max() == 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 && UsingClearType() &&
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 = round(fontMetrics.ascent * mFUnitsConvFactor);
mMetrics->maxDescent = round(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;
if (SUCCEEDED(mFontFace->GetGlyphIndices(&ucs, 1, &glyph)) && glyph != 0) {
mSpaceGlyph = glyph;
mMetrics->spaceWidth = MeasureGlyphWidth(glyph);
} else {
mMetrics->spaceWidth = 0;
}
// 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->GetGlyphIndices(&ucs, 1, &glyph)) && glyph != 0) {
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->GetGlyphIndices(&ucs, 1, &glyph)) && glyph != 0) {
mMetrics->zeroWidth = MeasureGlyphWidth(glyph);
} else {
mMetrics->zeroWidth = -1.0; // indicates not found
}
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 zeroWidth: %f\n",
mMetrics->spaceWidth, mMetrics->aveCharWidth, mMetrics->zeroWidth);
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::IsValid() const { return mFontFace != nullptr; }
IDWriteFontFace* gfxDWriteFont::GetFontFace() { return mFontFace.get(); }
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(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() const {
return static_cast<gfxDWriteFontEntry*>(mFontEntry.get())
->GetForceGDIClassic() &&
cairo_dwrite_get_cleartype_rendering_mode() < 0 &&
GetAdjustedSize() <= gfxDWriteFontList::PlatformFontList()
->GetForceGDIClassicMaxFontSize();
}
DWRITE_MEASURING_MODE
gfxDWriteFont::GetMeasuringMode() const {
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 0.0;
}
bool gfxDWriteFont::GetGlyphBounds(uint16_t aGID, gfxRect* aBounds,
bool aTight) {
DWRITE_GLYPH_METRICS m;
HRESULT hr = mFontFace->GetDesignGlyphMetrics(&aGID, 1, &m, FALSE);
if (FAILED(hr)) {
return false;
}
gfxRect bounds(m.leftSideBearing, m.topSideBearing - m.verticalOriginY,
m.advanceWidth - m.leftSideBearing - m.rightSideBearing,
m.advanceHeight - m.topSideBearing - m.bottomSideBearing);
bounds.Scale(mFUnitsConvFactor);
// GetDesignGlyphMetrics returns 'ideal' glyph metrics, we need to pad to
// account for antialiasing.
if (!aTight && !aBounds->IsEmpty()) {
bounds.Inflate(1.0, 0.0);
}
*aBounds = bounds;
return true;
}
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 != UsingClearType()) {
mAzureScaledFont = nullptr;
}
if (!mAzureScaledFont) {
gfxDWriteFontEntry* fe = static_cast<gfxDWriteFontEntry*>(mFontEntry.get());
bool forceGDI = GetForceGDIClassic();
IDWriteRenderingParams* params =
gfxWindowsPlatform::GetPlatform()->GetRenderingParams(
UsingClearType()
? (forceGDI ? gfxWindowsPlatform::TEXT_RENDERING_GDI_CLASSIC
: gfxWindowsPlatform::TEXT_RENDERING_NORMAL)
: gfxWindowsPlatform::TEXT_RENDERING_NO_CLEARTYPE);
DWRITE_RENDERING_MODE renderingMode = params->GetRenderingMode();
FLOAT gamma = params->GetGamma();
FLOAT contrast = params->GetEnhancedContrast();
if (forceGDI || renderingMode == DWRITE_RENDERING_MODE_GDI_CLASSIC) {
renderingMode = DWRITE_RENDERING_MODE_GDI_CLASSIC;
gamma = GetSystemGDIGamma();
contrast = 0.0f;
}
bool useEmbeddedBitmap =
(renderingMode == DWRITE_RENDERING_MODE_DEFAULT ||
renderingMode == DWRITE_RENDERING_MODE_GDI_CLASSIC) &&
fe->IsCJKFont() && HasBitmapStrikeForSize(NS_lround(mAdjustedSize));
const gfxFontStyle* fontStyle = GetStyle();
mAzureScaledFont = Factory::CreateScaledFontForDWriteFont(
mFontFace, fontStyle, GetUnscaledFont(), GetAdjustedSize(),
useEmbeddedBitmap, (int)renderingMode, params, gamma, contrast);
if (!mAzureScaledFont) {
return nullptr;
}
InitializeScaledFont();
mAzureScaledFontUsedClearType = UsingClearType();
}
RefPtr<ScaledFont> scaledFont(mAzureScaledFont);
return scaledFont.forget();
}
bool gfxDWriteFont::ShouldRoundXOffset(cairo_t* aCairo) const {
// show_glyphs is implemented on the font and so is used for all Cairo
// surface types; however, it may pixel-snap depending on the dwrite
// rendering mode
return GetForceGDIClassic() ||
gfxWindowsPlatform::GetPlatform()->DWriteMeasuringMode() !=
DWRITE_MEASURING_MODE_NATURAL;
}
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