SkScalerContext_win_dw.h

Enable keyboard shortcuts

/*

 * Copyright 2014 Google Inc.

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

*/

#ifndef SkScalarContext_win_dw_DEFINED

#define SkScalarContext_win_dw_DEFINED

#include "include/core/SkScalar.h"

#include "include/core/SkTypes.h"

#include "include/private/base/SkTDArray.h"

#include "src/core/SkScalerContext.h"

#include "src/ports/SkTypeface_win_dw.h"

#include <dwrite.h>

#include <dwrite_2.h>

class SkGlyph;

class SkDescriptor;

class SkScalerContext_DW : public SkScalerContext {

public:

    SkScalerContext_DW(sk_sp<DWriteFontTypeface>,

                       const SkScalerContextEffects&,

                       const SkDescriptor*);

    ~SkScalerContext_DW() override;

protected:

    bool generateAdvance(SkGlyph* glyph) override;

    void generateMetrics(SkGlyph* glyph, SkArenaAlloc*) override;

    void generateImage(const SkGlyph& glyph) override;

    bool generatePath(const SkGlyph&, SkPath*) override;

    sk_sp<SkDrawable> generateDrawable(const SkGlyph&) override;

    void generateFontMetrics(SkFontMetrics*) override;

private:

    struct ScalerContextBits {

        using value_type = decltype(SkGlyph::fScalerContextBits);

        static const constexpr value_type ForceBW = 1 << 0;

        static const constexpr value_type DW   = 0 << 1;

        static const constexpr value_type PNG  = 1 << 1;

        static const constexpr value_type SVG  = 2 << 1;

        static const constexpr value_type COLR = 3 << 1;

        static const constexpr value_type PATH = 4 << 1;

        static const constexpr value_type FormatMask = 0x7 << 1;

};

    static void BilevelToBW(const uint8_t* SK_RESTRICT src, const SkGlyph& glyph);

    template<bool APPLY_PREBLEND>

    static void GrayscaleToA8(const uint8_t* SK_RESTRICT src,

                              const SkGlyph& glyph,

                              const uint8_t* table8);

    template<bool APPLY_PREBLEND>

    static void RGBToA8(const uint8_t* SK_RESTRICT src,

                        const SkGlyph& glyph,

                        const uint8_t* table8);

    template<bool APPLY_PREBLEND, bool RGB>

    static void RGBToLcd16(const uint8_t* SK_RESTRICT src, const SkGlyph& glyph,

                           const uint8_t* tableR, const uint8_t* tableG, const uint8_t* tableB,

                           int clearTypeLevel);

    const void* drawDWMask(const SkGlyph& glyph,

                           DWRITE_RENDERING_MODE renderingMode,

                           DWRITE_TEXTURE_TYPE textureType);

    HRESULT getBoundingBox(SkGlyph* glyph,

                           DWRITE_RENDERING_MODE renderingMode,

                           DWRITE_TEXTURE_TYPE textureType,

                           RECT* bbox);

    DWriteFontTypeface* getDWriteTypeface() {

        return static_cast<DWriteFontTypeface*>(this->getTypeface());

    bool isColorGlyph(const SkGlyph&);

    bool getColorGlyphRun(const SkGlyph&, IDWriteColorGlyphRunEnumerator**);

    bool generateColorMetrics(SkGlyph*);

    bool generateColorGlyphImage(const SkGlyph&);

    bool drawColorGlyphImage(const SkGlyph&, SkCanvas&);

    bool isSVGGlyph(const SkGlyph&);

    bool generateSVGMetrics(SkGlyph*);

    bool generateSVGGlyphImage(const SkGlyph&);

    bool drawSVGGlyphImage(const SkGlyph&, SkCanvas&);

    bool isPngGlyph(const SkGlyph&);

    bool generatePngMetrics(SkGlyph*);

    bool generatePngGlyphImage(const SkGlyph&);

    bool drawPngGlyphImage(const SkGlyph&, SkCanvas&);

    static void SetGlyphBounds(SkGlyph* glyph, const SkRect& bounds);

    SkTDArray<uint8_t> fBits;

    /** The total matrix without the text height scale. */

    SkMatrix fSkXform;

    /** The total matrix without the text height scale. */

    DWRITE_MATRIX fXform;

    /** The text size to render with. */

    SkScalar fTextSizeRender;

    /** The text size to measure with. */

    SkScalar fTextSizeMeasure;

    int fGlyphCount;

    DWRITE_RENDERING_MODE fRenderingMode;

    DWRITE_TEXTURE_TYPE fTextureType;

    DWRITE_MEASURING_MODE fMeasuringMode;

    DWRITE_TEXT_ANTIALIAS_MODE fAntiAliasMode;

    DWRITE_GRID_FIT_MODE fGridFitMode;

    int fClearTypeLevel;

};

#endif