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 <ApplicationServices/ApplicationServices.h>
  12
  13 #include "mozilla/gfx/UnscaledFontMac.h"
  14
  15 class MacOSFontEntry;
  16
  17 class gfxMacFont final : public gfxFont {
  18  public:
  19   gfxMacFont(const RefPtr<mozilla::gfx::UnscaledFontMac>& aUnscaledFont, MacOSFontEntry* aFontEntry,
  20              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, DrawTarget* aDrawTargetForTightBoundingBox,
  27                      Spacing* aSpacing, mozilla::gfx::ShapedTextFlags aOrientation) override;
  28
  29   // We need to provide hinted (non-linear) glyph widths if using a font
  30   // with embedded color bitmaps (Apple Color Emoji), as Core Text renders
  31   // the glyphs with non-linear scaling at small pixel sizes.
  32   bool ProvidesGlyphWidths() const override {
  33     return mVariationFont || mFontEntry->HasFontTable(TRUETYPE_TAG('s', 'b', 'i', 'x'));
  34   }
  35
  36   int32_t GetGlyphWidth(uint16_t aGID) override;
  37
  38   bool GetGlyphBounds(uint16_t aGID, gfxRect* aBounds, bool aTight) override;
  39
  40   already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont(
  41       const TextRunDrawParams& aRunParams) override;
  42
  43   bool ShouldRoundXOffset(cairo_t* aCairo) const override;
  44
  45   void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  46                               FontCacheSizes* aSizes) const override;
  47   void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  48                               FontCacheSizes* aSizes) const override;
  49
  50   FontType GetType() const override { return FONT_TYPE_MAC; }
  51
  52   bool UseNativeColrFontSupport() const override;
  53
  54   // Helper to create a CTFont from a CGFont, with optional font descriptor
  55   // (for features), and copying any variations that were set on the CGFont.
  56   // This is public so that gfxCoreTextShaper can also use it.
  57   static CTFontRef CreateCTFontFromCGFontWithVariations(CGFontRef aCGFont, CGFloat aSize,
  58                                                         bool aInstalledFont,
  59                                                         CTFontDescriptorRef aFontDesc = nullptr);
  60
  61  protected:
  62   ~gfxMacFont() override;
  63
  64   const Metrics& GetHorizontalMetrics() const override { return mMetrics; }
  65
  66   // override to prefer CoreText shaping with fonts that depend on AAT
  67   bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText, uint32_t aOffset, uint32_t aLength,
  68                  Script aScript, nsAtom* aLanguage, bool aVertical, RoundingFlags aRounding,
  69                  gfxShapedText* aShapedText) override;
  70
  71   void InitMetrics();
  72   void InitMetricsFromPlatform();
  73
  74   // Get width and glyph ID for a character; uses aConvFactor
  75   // to convert font units as returned by CG to actual dimensions
  76   gfxFloat GetCharWidth(CFDataRef aCmap, char16_t aUniChar, uint32_t* aGlyphID,
  77                         gfxFloat aConvFactor);
  78
  79   // a strong reference to the CoreGraphics font
  80   CGFontRef mCGFont;
  81
  82   // a Core Text font reference, created only if we're using CT to measure
  83   // glyph widths; otherwise null.
  84   CTFontRef mCTFont;
  85
  86   mozilla::UniquePtr<gfxFontShaper> mCoreTextShaper;
  87
  88   Metrics mMetrics;
  89   nscolor mFontSmoothingBackgroundColor;
  90
  91   bool mVariationFont;  // true if font has OpenType variations
  92 };
  93
  94 #endif /* GFX_MACFONT_H */