1 files changed, 87 insertions, 0 deletions
diff --git a/include/graphics/SkScalerContext.h b/include/graphics/SkScalerContext.h
new file mode 100644
index 0000000000..db12c73b7d
--- /dev/null
+++ b/include/graphics/SkScalerContext.h
@@ -0,0 +1,87 @@
+#ifndef SkScalerContext_DEFINED
+#define SkScalerContext_DEFINED
+
+#include "SkMatrix.h"
+#include "SkPath.h"
+#include "SkPoint.h"
+
+class SkDescriptor;
+class SkMaskFilter;
+class SkPaint;
+class SkPathEffect;
+class SkRasterizer;
+
+#define SK_UnknownAuxScalerContextID    0
+#define SK_MaxAuxScalerContextID        16
+
+struct SkGlyph {
+	void*       fImage;
+	SkPath*     fPath;
+	SkFixed     fAdvanceX, fAdvanceY;
+
+	uint16_t	fGlyphID;
+	uint16_t	fWidth, fHeight, fRowBytes;
+	int16_t		fTop, fLeft;
+
+	uint16_t	fCharCode;	// might go away with line layout. really wants 20bits
+	uint8_t		fMaskFormat;
+	SkBool8     fUseAuxContext; // just need 1-bit for this field
+
+	size_t computeImageSize() const;
+};
+
+class SkScalerContext {
+public:
+	struct Rec {
+		SkScalar	fTextSize, fPreScaleX, fPreSkewX;
+		SkScalar	fPost2x2[2][2];
+		SkScalar	fFrameWidth, fMiterLimit;
+		SkBool8		fUseHints;
+		SkBool8		fFrameAndFill;
+		SkBool8		fDoAA;
+		uint8_t		fStrokeJoin;
+
+		void	getMatrixFrom2x2(SkMatrix*) const;
+		void	getLocalMatrix(SkMatrix*) const;
+		void	getSingleMatrix(SkMatrix*) const;
+	};
+
+	SkScalerContext(const SkDescriptor* desc);
+	virtual	~SkScalerContext();
+
+	void	getMetrics(SkGlyph*);
+	void	getImage(const SkGlyph&);
+	void	getPath(const SkGlyph&, SkPath*);
+	void	getLineHeight(SkPoint* above, SkPoint* below);
+
+	static inline void MakeRec(const SkPaint&, const SkMatrix*, Rec* rec);
+	static SkScalerContext* Create(const SkDescriptor*);
+
+protected:
+	Rec	fRec;
+
+	virtual void generateMetrics(SkGlyph*) = 0;
+	virtual void generateImage(const SkGlyph&) = 0;
+	virtual void generatePath(const SkGlyph&, SkPath*) = 0;
+	virtual void generateLineHeight(SkPoint* above, SkPoint* below) = 0;
+
+private:
+	SkPathEffect*	fPathEffect;
+	SkMaskFilter*	fMaskFilter;
+    SkRasterizer*   fRasterizer;
+	SkScalar		fDevFrameWidth;
+
+    void internalGetPath(const SkGlyph& glyph, SkPath* fillPath, SkPath* devPath, SkMatrix* fillToDevMatrix);
+
+    // we index into this with scalerContextID-1
+    SkScalerContext* fAuxContext[SK_MaxAuxScalerContextID];
+};
+
+#define kRec_SkDescriptorTag			SkSetFourByteTag('s', 'r', 'e', 'c')
+#define kTypeface_SkDescriptorTag		SkSetFourByteTag('t', 'p', 'f', 'c')
+#define kPathEffect_SkDescriptorTag		SkSetFourByteTag('p', 't', 'h', 'e')
+#define kMaskFilter_SkDescriptorTag		SkSetFourByteTag('m', 's', 'k', 'f')
+#define kRasterizer_SkDescriptorTag		SkSetFourByteTag('r', 'a', 's', 't')
+
+#endif
+