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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * 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 <ApplicationServices/ApplicationServices.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,
                   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 */