gfx/thebes/gfxCoreTextShaper.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_CORETEXTSHAPER_H
   7 #define GFX_CORETEXTSHAPER_H
   8
   9 #include "gfxFont.h"
  10
  11 #include <CoreText/CoreText.h>
  12
  13 class gfxMacFont;
  14
  15 class gfxCoreTextShaper : public gfxFontShaper {
  16  public:
  17   explicit gfxCoreTextShaper(gfxMacFont* aFont);
  18
  19   virtual ~gfxCoreTextShaper();
  20
  21   bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText,
  22                  uint32_t aOffset, uint32_t aLength, Script aScript,
  23                  nsAtom* aLanguage, bool aVertical, RoundingFlags aRounding,
  24                  gfxShapedText* aShapedText) override;
  25
  26   // clean up static objects that may have been cached
  27   static void Shutdown();
  28
  29   // Flags used to track what AAT features should be enabled on the Core Text
  30   // font instance. (Internal; only public so that we can use the
  31   // MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS macro below.)
  32   enum FeatureFlags : uint8_t {
  33     kDefaultFeatures = 0x00,
  34     // bit flags for non-default feature settings we might need
  35     // to use, which will require separate font instances
  36     kDisableLigatures = 0x01,
  37     kAddSmallCaps = 0x02,
  38     kIndicFeatures = 0x04,
  39
  40     // number of font instances, indexed by OR-ing the flags above
  41     kMaxFontInstances = 8
  42   };
  43
  44  protected:
  45   CTFontRef mCTFont[kMaxFontInstances];
  46
  47   // attributes for shaping text with LTR or RTL directionality
  48   CFDictionaryRef mAttributesDictLTR;
  49   CFDictionaryRef mAttributesDictRTL;
  50
  51   nsresult SetGlyphsFromRun(gfxShapedText* aShapedText, uint32_t aOffset,
  52                             uint32_t aLength, CTRunRef aCTRun);
  53
  54   CTFontRef CreateCTFontWithFeatures(CGFloat aSize,
  55                                      CTFontDescriptorRef aDescriptor);
  56
  57   CFDictionaryRef CreateAttrDict(bool aRightToLeft);
  58   CFDictionaryRef CreateAttrDictWithoutDirection();
  59
  60   static CTFontDescriptorRef CreateFontFeaturesDescriptor(
  61       const std::pair<SInt16, SInt16>* aFeatures, size_t aCount);
  62
  63   static CTFontDescriptorRef GetFeaturesDescriptor(FeatureFlags aFeatureFlags);
  64
  65   // cached font descriptors, created the first time they're needed
  66   static CTFontDescriptorRef sFeaturesDescriptor[kMaxFontInstances];
  67 };
  68
  69 MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(gfxCoreTextShaper::FeatureFlags)
  70
  71 #endif /* GFX_CORETEXTSHAPER_H */