1/*
2 * Copyright 2014 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef SkScalarContext_win_dw_DEFINED
9#define SkScalarContext_win_dw_DEFINED
10
11#include "include/core/SkScalar.h"
12#include "include/core/SkTypes.h"
13#include "src/core/SkScalerContext.h"
14#include "src/ports/SkTypeface_win_dw.h"
15
16#include <dwrite.h>
17#include <dwrite_2.h>
18
19class SkGlyph;
20class SkDescriptor;
21
22class SkScalerContext_DW : public SkScalerContext {
23public:
24    SkScalerContext_DW(sk_sp<DWriteFontTypeface>,
25                       const SkScalerContextEffects&,
26                       const SkDescriptor*);
27    ~SkScalerContext_DW() override;
28
29protected:
30    bool generateAdvance(SkGlyph* glyph) override;
31    void generateMetrics(SkGlyph* glyph) override;
32    void generateImage(const SkGlyph& glyph) override;
33    bool generatePath(SkGlyphID glyph, SkPath* path) override;
34    void generateFontMetrics(SkFontMetrics*) override;
35
36private:
37    static void BilevelToBW(const uint8_t* SK_RESTRICT src, const SkGlyph& glyph);
38
39    template<bool APPLY_PREBLEND>
40    static void GrayscaleToA8(const uint8_t* SK_RESTRICT src,
41                              const SkGlyph& glyph,
42                              const uint8_t* table8);
43
44    template<bool APPLY_PREBLEND>
45    static void RGBToA8(const uint8_t* SK_RESTRICT src,
46                        const SkGlyph& glyph,
47                        const uint8_t* table8);
48
49    template<bool APPLY_PREBLEND, bool RGB>
50    static void RGBToLcd16(const uint8_t* SK_RESTRICT src, const SkGlyph& glyph,
51                           const uint8_t* tableR, const uint8_t* tableG, const uint8_t* tableB);
52
53    const void* drawDWMask(const SkGlyph& glyph,
54                           DWRITE_RENDERING_MODE renderingMode,
55                           DWRITE_TEXTURE_TYPE textureType);
56
57    HRESULT getBoundingBox(SkGlyph* glyph,
58                           DWRITE_RENDERING_MODE renderingMode,
59                           DWRITE_TEXTURE_TYPE textureType,
60                           RECT* bbox);
61
62    bool isColorGlyph(const SkGlyph& glyph);
63
64    bool isPngGlyph(const SkGlyph& glyph);
65
66    DWriteFontTypeface* getDWriteTypeface() {
67        return static_cast<DWriteFontTypeface*>(this->getTypeface());
68    }
69
70    bool getColorGlyphRun(const SkGlyph& glyph, IDWriteColorGlyphRunEnumerator** colorGlyph);
71
72    void generateColorMetrics(SkGlyph* glyph);
73
74    void generateColorGlyphImage(const SkGlyph& glyph);
75
76    void generatePngMetrics(SkGlyph* glyph);
77
78    void generatePngGlyphImage(const SkGlyph& glyph);
79
80
81    SkTDArray<uint8_t> fBits;
82    /** The total matrix without the text height scale. */
83    SkMatrix fSkXform;
84    /** The total matrix without the text height scale. */
85    DWRITE_MATRIX fXform;
86    /** The text size to render with. */
87    SkScalar fTextSizeRender;
88    /** The text size to measure with. */
89    SkScalar fTextSizeMeasure;
90    int fGlyphCount;
91    DWRITE_RENDERING_MODE fRenderingMode;
92    DWRITE_TEXTURE_TYPE fTextureType;
93    DWRITE_MEASURING_MODE fMeasuringMode;
94    DWRITE_TEXT_ANTIALIAS_MODE fAntiAliasMode;
95    DWRITE_GRID_FIT_MODE fGridFitMode;
96    bool fIsColorFont;
97};
98
99#endif
100