Split SkFontHost_win_dw.

src/ports/SkScalerContext_win_dw.h

+/*
+ * 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 "SkScalar.h"
+#include "SkScalerContext.h"
+#include "SkTypeface_win_dw.h"
+#include "SkTypes.h"
+
+#include <dwrite.h>
+
+struct SkGlyph;
+class SkDescriptor;
+
+class SkScalerContext_DW : public SkScalerContext {
+public:
+    SkScalerContext_DW(DWriteFontTypeface*, const SkDescriptor* desc);
+    virtual ~SkScalerContext_DW();
+
+protected:
+    virtual unsigned generateGlyphCount() SK_OVERRIDE;
+    virtual uint16_t generateCharToGlyph(SkUnichar uni) SK_OVERRIDE;
+    virtual void generateAdvance(SkGlyph* glyph) SK_OVERRIDE;
+    virtual void generateMetrics(SkGlyph* glyph) SK_OVERRIDE;
+    virtual void generateImage(const SkGlyph& glyph) SK_OVERRIDE;
+    virtual void generatePath(const SkGlyph& glyph, SkPath* path) SK_OVERRIDE;
+    virtual void generateFontMetrics(SkPaint::FontMetrics* mX,
+                                     SkPaint::FontMetrics* mY) SK_OVERRIDE;
+
+private:
+    const void* drawDWMask(const SkGlyph& glyph);
+
+    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 non-rotational part of total matrix without the text height scale.
+     *  This is used to find the magnitude of gdi compatible advances.
+     */
+    DWRITE_MATRIX fGsA;
+    /** The inverse of the rotational part of the total matrix.
+     *  This is used to find the direction of gdi compatible advances.
+     */
+    SkMatrix fG_inv;
+    /** The text size to render with. */
+    SkScalar fTextSizeRender;
+    /** The text size to measure with. */
+    SkScalar fTextSizeMeasure;
+    SkAutoTUnref<DWriteFontTypeface> fTypeface;
+    int fGlyphCount;
+    DWRITE_RENDERING_MODE fRenderingMode;
+    DWRITE_TEXTURE_TYPE fTextureType;
+    DWRITE_MEASURING_MODE fMeasuringMode;
+};
+
+#endif