gfx/thebes/gfxMacFont.h

   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 */