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      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 "SkScalar.h"
     12 #include "SkScalerContext.h"
     13 #include "SkTypeface_win_dw.h"
     14 #include "SkTypes.h"
     15 
     16 #include <dwrite.h>
     17 #include <dwrite_2.h>
     18 
     19 class SkGlyph;
     20 class SkDescriptor;
     21 
     22 class SkScalerContext_DW : public SkScalerContext {
     23 public:
     24     SkScalerContext_DW(sk_sp<DWriteFontTypeface>,
     25                        const SkScalerContextEffects&,
     26                        const SkDescriptor*);
     27     ~SkScalerContext_DW() override;
     28 
     29 protected:
     30     unsigned generateGlyphCount() override;
     31     uint16_t generateCharToGlyph(SkUnichar uni) override;
     32     void generateAdvance(SkGlyph* glyph) override;
     33     void generateMetrics(SkGlyph* glyph) override;
     34     void generateImage(const SkGlyph& glyph) override;
     35     void generatePath(SkGlyphID glyph, SkPath* path) override;
     36     void generateFontMetrics(SkPaint::FontMetrics*) override;
     37 
     38 private:
     39     const void* drawDWMask(const SkGlyph& glyph,
     40                            DWRITE_RENDERING_MODE renderingMode,
     41                            DWRITE_TEXTURE_TYPE textureType);
     42 
     43     HRESULT getBoundingBox(SkGlyph* glyph,
     44                            DWRITE_RENDERING_MODE renderingMode,
     45                            DWRITE_TEXTURE_TYPE textureType,
     46                            RECT* bbox);
     47 
     48     bool isColorGlyph(const SkGlyph& glyph);
     49 
     50     DWriteFontTypeface* getDWriteTypeface() {
     51         return static_cast<DWriteFontTypeface*>(this->getTypeface());
     52     }
     53 
     54     bool getColorGlyphRun(const SkGlyph& glyph, IDWriteColorGlyphRunEnumerator** colorGlyph);
     55 
     56     void generateColorGlyphImage(const SkGlyph& glyph);
     57 
     58     SkTDArray<uint8_t> fBits;
     59     /** The total matrix without the text height scale. */
     60     SkMatrix fSkXform;
     61     /** The total matrix without the text height scale. */
     62     DWRITE_MATRIX fXform;
     63     /** The text size to render with. */
     64     SkScalar fTextSizeRender;
     65     /** The text size to measure with. */
     66     SkScalar fTextSizeMeasure;
     67     int fGlyphCount;
     68     DWRITE_RENDERING_MODE fRenderingMode;
     69     DWRITE_TEXTURE_TYPE fTextureType;
     70     DWRITE_MEASURING_MODE fMeasuringMode;
     71     DWRITE_TEXT_ANTIALIAS_MODE fAntiAliasMode;
     72     DWRITE_GRID_FIT_MODE fGridFitMode;
     73     bool fIsColorFont;
     74 };
     75 
     76 #endif
     77