gecko-dev/gfx/thebes/gfxDWriteFonts.h

112 lines
3.3 KiB
C++

/* -*- 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/. */
#ifndef GFX_WINDOWSDWRITEFONTS_H
#define GFX_WINDOWSDWRITEFONTS_H
#include <dwrite.h>
#include "gfxFont.h"
#include "gfxUserFontSet.h"
#include "cairo-win32.h"
#include "nsDataHashtable.h"
#include "nsHashKeys.h"
/**
* \brief Class representing a font face for a font entry.
*/
class gfxDWriteFont : public gfxFont
{
public:
gfxDWriteFont(gfxFontEntry *aFontEntry,
const gfxFontStyle *aFontStyle,
bool aNeedsBold = false,
AntialiasOption = kAntialiasDefault);
~gfxDWriteFont();
virtual gfxFont* CopyWithAntialiasOption(AntialiasOption anAAOption);
virtual const gfxFont::Metrics& GetMetrics();
virtual uint32_t GetSpaceGlyph();
virtual bool SetupCairoFont(gfxContext *aContext);
virtual bool AllowSubpixelAA() { return mAllowManualShowGlyphs; }
virtual bool IsValid();
gfxFloat GetAdjustedSize() {
return mAdjustedSize;
}
IDWriteFontFace *GetFontFace();
/* override Measure to add padding for antialiasing */
virtual RunMetrics Measure(gfxTextRun *aTextRun,
uint32_t aStart, uint32_t aEnd,
BoundingBoxType aBoundingBoxType,
gfxContext *aContextForTightBoundingBox,
Spacing *aSpacing);
// override gfxFont table access function to bypass gfxFontEntry cache,
// use DWrite API to get direct access to system font data
virtual hb_blob_t *GetFontTable(uint32_t aTag);
virtual bool ProvidesGlyphWidths();
virtual int32_t GetGlyphWidth(gfxContext *aCtx, uint16_t aGID);
virtual mozilla::TemporaryRef<mozilla::gfx::GlyphRenderingOptions> GetGlyphRenderingOptions();
virtual void SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf,
FontCacheSizes* aSizes) const;
virtual void SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf,
FontCacheSizes* aSizes) const;
virtual FontType GetType() const { return FONT_TYPE_DWRITE; }
virtual mozilla::TemporaryRef<mozilla::gfx::ScaledFont> GetScaledFont(mozilla::gfx::DrawTarget *aTarget);
virtual cairo_scaled_font_t *GetCairoScaledFont();
protected:
friend class gfxDWriteShaper;
virtual void CreatePlatformShaper();
bool GetFakeMetricsForArialBlack(DWRITE_FONT_METRICS *aFontMetrics);
void ComputeMetrics(AntialiasOption anAAOption);
bool HasBitmapStrikeForSize(uint32_t aSize);
cairo_font_face_t *CairoFontFace();
gfxFloat MeasureGlyphWidth(uint16_t aGlyph);
static void DestroyBlobFunc(void* userArg);
DWRITE_MEASURING_MODE GetMeasuringMode();
bool GetForceGDIClassic();
nsRefPtr<IDWriteFontFace> mFontFace;
cairo_font_face_t *mCairoFontFace;
gfxFont::Metrics *mMetrics;
// cache of glyph widths in 16.16 fixed-point pixels
nsDataHashtable<nsUint32HashKey,int32_t> mGlyphWidths;
bool mNeedsOblique;
bool mNeedsBold;
bool mUseSubpixelPositions;
bool mAllowManualShowGlyphs;
bool mAzureScaledFontIsCairo;
};
#endif