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 : public gfxFont {
  18  public:
  19   gfxMacFont(const RefPtr<mozilla::gfx::UnscaledFontMac>& aUnscaledFont, MacOSFontEntry* aFontEntry,
  20              const gfxFontStyle* aFontStyle);
  21
  22   virtual ~gfxMacFont();
  23
  24   CGFontRef GetCGFontRef() const { return mCGFont; }
  25
  26   /* override Measure to add padding for antialiasing */
  27   RunMetrics Measure(const gfxTextRun* aTextRun, uint32_t aStart, uint32_t aEnd,
  28                      BoundingBoxType aBoundingBoxType, DrawTarget* aDrawTargetForTightBoundingBox,
  29                      Spacing* aSpacing, 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 || mFontEntry->HasFontTable(TRUETYPE_TAG('s', 'b', 'i', 'x'));
  36   }
  37
  38   int32_t GetGlyphWidth(uint16_t aGID) override;
  39
  40   bool GetGlyphBounds(uint16_t aGID, gfxRect* aBounds, bool aTight) override;
  41
  42   already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont(
  43       mozilla::gfx::DrawTarget* aTarget) override;
  44
  45   bool ShouldRoundXOffset(cairo_t* aCairo) const override;
  46
  47   void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  48                               FontCacheSizes* aSizes) const override;
  49   void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
  50                               FontCacheSizes* aSizes) const override;
  51
  52   FontType GetType() const override { return FONT_TYPE_MAC; }
  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   const Metrics& GetHorizontalMetrics() override { return mMetrics; }
  63
  64   // override to prefer CoreText shaping with fonts that depend on AAT
  65   bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText, uint32_t aOffset, uint32_t aLength,
  66                  Script aScript, nsAtom* aLanguage, bool aVertical, RoundingFlags aRounding,
  67                  gfxShapedText* aShapedText) override;
  68
  69   void InitMetrics();
  70   void InitMetricsFromPlatform();
  71
  72   // Get width and glyph ID for a character; uses aConvFactor
  73   // to convert font units as returned by CG to actual dimensions
  74   gfxFloat GetCharWidth(CFDataRef aCmap, char16_t aUniChar, uint32_t* aGlyphID,
  75                         gfxFloat aConvFactor);
  76
  77   // a strong reference to the CoreGraphics font
  78   CGFontRef mCGFont;
  79
  80   // a Core Text font reference, created only if we're using CT to measure
  81   // glyph widths; otherwise null.
  82   CTFontRef mCTFont;
  83
  84   mozilla::UniquePtr<gfxFontShaper> mCoreTextShaper;
  85
  86   Metrics mMetrics;
  87   nscolor mFontSmoothingBackgroundColor;
  88
  89   bool mVariationFont;  // true if font has OpenType variations
  90 };
  91
  92 #endif /* GFX_MACFONT_H */