Source code

Revision control

Copy as Markdown

Other Tools

/* -*- 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 */
#include "mozilla/Atomics.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/UniquePtr.h"
#include <dwrite_1.h>
#include "gfxFont.h"
#include "gfxUserFontSet.h"
#include "nsTHashMap.h"
#include "nsHashKeys.h"
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/gfx/UnscaledFontDWrite.h"
* \brief Class representing a font face for a font entry.
class gfxDWriteFont final : public gfxFont {
gfxDWriteFont(const RefPtr<mozilla::gfx::UnscaledFontDWrite>& aUnscaledFont,
gfxFontEntry* aFontEntry, const gfxFontStyle* aFontStyle,
RefPtr<IDWriteFontFace> aFontFace = nullptr,
AntialiasOption = kAntialiasDefault);
static bool InitDWriteSupport();
// These Update functions update gfxVars with font settings, they must only be
// called in the parent process.
static void UpdateSystemTextVars();
static void UpdateClearTypeVars();
static void SystemTextQualityChanged();
gfxFont* CopyWithAntialiasOption(AntialiasOption anAAOption) const override;
bool AllowSubpixelAA() const override { return mAllowManualShowGlyphs; }
bool IsValid() const;
IDWriteFontFace* GetFontFace();
/* override Measure to add padding for antialiasing */
RunMetrics Measure(const gfxTextRun* aTextRun, uint32_t aStart, uint32_t aEnd,
BoundingBoxType aBoundingBoxType,
DrawTarget* aDrawTargetForTightBoundingBox,
Spacing* aSpacing,
mozilla::gfx::ShapedTextFlags aOrientation) override;
bool ProvidesGlyphWidths() const override;
int32_t GetGlyphWidth(uint16_t aGID) override;
bool GetGlyphBounds(uint16_t aGID, gfxRect* aBounds, bool aTight) override;
void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const override;
void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const override;
FontType GetType() const override { return FONT_TYPE_DWRITE; }
already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont(
const TextRunDrawParams& aRunParams) override;
bool ShouldRoundXOffset(cairo_t* aCairo) const override;
~gfxDWriteFont() override;
const Metrics& GetHorizontalMetrics() const override { return mMetrics; }
bool GetFakeMetricsForArialBlack(DWRITE_FONT_METRICS* aFontMetrics);
void ComputeMetrics(AntialiasOption anAAOption);
bool HasBitmapStrikeForSize(uint32_t aSize);
gfxFloat MeasureGlyphWidth(uint16_t aGlyph);
DWRITE_MEASURING_MODE GetMeasuringMode() const;
static mozilla::Atomic<bool> sForceGDIClassicEnabled;
bool GetForceGDIClassic() const;
RefPtr<IDWriteFontFace> mFontFace;
RefPtr<IDWriteFontFace1> mFontFace1; // may be unavailable on older DWrite
Metrics mMetrics;
// cache of glyph widths in 16.16 fixed-point pixels
mozilla::UniquePtr<nsTHashMap<nsUint32HashKey, int32_t>> mGlyphWidths;
bool mUseSubpixelPositions;
bool mAllowManualShowGlyphs;
// Used to record the sUseClearType setting at the time mAzureScaledFont
// was set up, so we can tell if it's stale and needs to be re-created.
mozilla::Atomic<bool> mAzureScaledFontUsedClearType;
// Cache the GDI version of the ScaledFont so that font keys and other
// meta-data can remain stable even if there is thrashing between GDI and
// non-GDI usage.
mozilla::Atomic<mozilla::gfx::ScaledFont*> mAzureScaledFontGDI;
bool UsingClearType() {
return mozilla::gfx::gfxVars::SystemTextQuality() == CLEARTYPE_QUALITY;