gfxCoreTextShaper.h

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef GFX_CORETEXTSHAPER_H

#define GFX_CORETEXTSHAPER_H

#include "gfxFont.h"

#include <CoreText/CoreText.h>

class gfxMacFont;

class gfxCoreTextShaper : public gfxFontShaper {

 public:

  explicit gfxCoreTextShaper(gfxMacFont* aFont);

  virtual ~gfxCoreTextShaper();

  bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText,

                 uint32_t aOffset, uint32_t aLength, Script aScript,

                 nsAtom* aLanguage, bool aVertical, RoundingFlags aRounding,

                 gfxShapedText* aShapedText) override;

  // clean up static objects that may have been cached

  static void Shutdown();

  // Flags used to track what AAT features should be enabled on the Core Text

  // font instance. (Internal; only public so that we can use the

  // MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS macro below.)

  enum FeatureFlags : uint8_t {

    kDefaultFeatures = 0x00,

    // bit flags for non-default feature settings we might need

    // to use, which will require separate font instances

    kDisableLigatures = 0x01,

    kAddSmallCaps = 0x02,

    kIndicFeatures = 0x04,

    // number of font instances, indexed by OR-ing the flags above

    kMaxFontInstances = 8

};

 protected:

  CTFontRef mCTFont[kMaxFontInstances];

  // attributes for shaping text with LTR or RTL directionality

  CFDictionaryRef mAttributesDictLTR;

  CFDictionaryRef mAttributesDictRTL;

  nsresult SetGlyphsFromRun(gfxShapedText* aShapedText, uint32_t aOffset,

                            uint32_t aLength, CTRunRef aCTRun);

  CTFontRef CreateCTFontWithFeatures(CGFloat aSize,

                                     CTFontDescriptorRef aDescriptor);

  CFDictionaryRef CreateAttrDict(bool aRightToLeft);

  CFDictionaryRef CreateAttrDictWithoutDirection();

  static CTFontDescriptorRef CreateFontFeaturesDescriptor(

      const std::pair<SInt16, SInt16>* aFeatures, size_t aCount);

  static CTFontDescriptorRef GetFeaturesDescriptor(FeatureFlags aFeatureFlags);

  // cached font descriptors, created the first time they're needed

  static CTFontDescriptorRef sFeaturesDescriptor[kMaxFontInstances];

};

MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(gfxCoreTextShaper::FeatureFlags)

#endif /* GFX_CORETEXTSHAPER_H */