gfxMacFont.h (3298B)
1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- 2 * This Source Code Form is subject to the terms of the Mozilla Public 3 * License, v. 2.0. If a copy of the MPL was not distributed with this 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 5 6 #ifndef GFX_MACFONT_H 7 #define GFX_MACFONT_H 8 9 #include "mozilla/MemoryReporting.h" 10 #include "gfxFont.h" 11 #include <CoreText/CoreText.h> 12 13 #include "mozilla/gfx/UnscaledFontMac.h" 14 15 class CTFontEntry; 16 17 class gfxMacFont final : public gfxFont { 18 public: 19 gfxMacFont(const RefPtr<mozilla::gfx::UnscaledFontMac>& aUnscaledFont, 20 CTFontEntry* aFontEntry, const gfxFontStyle* aFontStyle); 21 22 CGFontRef GetCGFontRef() const { return mCGFont; } 23 24 /* override Measure to add padding for antialiasing */ 25 RunMetrics Measure(const gfxTextRun* aTextRun, uint32_t aStart, uint32_t aEnd, 26 BoundingBoxType aBoundingBoxType, 27 DrawTarget* aDrawTargetForTightBoundingBox, 28 Spacing* aSpacing, 29 mozilla::gfx::ShapedTextFlags aOrientation) override; 30 31 // We need to provide hinted (non-linear) glyph widths if using a font 32 // with embedded color bitmaps (Apple Color Emoji), as Core Text renders 33 // the glyphs with non-linear scaling at small pixel sizes. 34 bool ProvidesGlyphWidths() const override { 35 return mVariationFont || 36 mFontEntry->HasFontTable(TRUETYPE_TAG('s', 'b', 'i', 'x')); 37 } 38 39 int32_t GetGlyphWidth(uint16_t aGID) override; 40 41 bool GetGlyphBounds(uint16_t aGID, gfxRect* aBounds, bool aTight) override; 42 43 already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont( 44 const TextRunDrawParams& aRunParams) override; 45 46 bool ShouldRoundXOffset(cairo_t* aCairo) const override; 47 48 void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf, 49 FontCacheSizes* aSizes) const override; 50 void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf, 51 FontCacheSizes* aSizes) const override; 52 53 FontType GetType() const override { return FONT_TYPE_MAC; } 54 55 bool UseNativeColrFontSupport() const override; 56 57 protected: 58 ~gfxMacFont() override; 59 60 const Metrics& GetHorizontalMetrics() const override { return mMetrics; } 61 62 // override to prefer CoreText shaping with fonts that depend on AAT 63 bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText, 64 uint32_t aOffset, uint32_t aLength, Script aScript, 65 nsAtom* aLanguage, bool aVertical, RoundingFlags aRounding, 66 gfxShapedText* aShapedText) override; 67 68 void InitMetrics(); 69 void InitMetricsFromPlatform(); 70 71 // Get width and glyph ID for a character; uses aConvFactor 72 // to convert font units as returned by CG to actual dimensions 73 gfxFloat GetCharWidth(CFDataRef aCmap, char16_t aUniChar, uint32_t* aGlyphID, 74 gfxFloat aConvFactor); 75 76 // a strong reference to the CoreGraphics font 77 CGFontRef mCGFont; 78 79 // a Core Text font reference, created only if we're using CT to measure 80 // glyph widths; otherwise null. 81 CTFontRef mCTFont; 82 83 mozilla::UniquePtr<gfxFontShaper> mCoreTextShaper; 84 85 Metrics mMetrics; 86 87 bool mVariationFont; // true if font has OpenType variations 88 }; 89 90 #endif /* GFX_MACFONT_H */