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/*
* 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 GrPathRendering_DEFINED
#define GrPathRendering_DEFINED
#include "SkPath.h"
class SkStrokeRec;
class GrPath;
class GrPathRange;
class GrGpu;
/**
* Abstract class wrapping HW path rendering API.
*
* The subclasses of this class use the possible HW API to render paths (as opposed to path
* rendering implemented in Skia on top of a "3d" HW API).
* The subclasses hold the global state needed to render paths, including shadow of the global HW
* API state. Similar to GrGpu.
*
* It is expected that the lifetimes of GrGpuXX and GrXXPathRendering are the same. The call context
* interface (eg. * the concrete instance of GrGpu subclass) should be provided to the instance
* during construction.
*/
class GrPathRendering {
public:
virtual ~GrPathRendering() { }
enum PathTransformType {
kNone_PathTransformType, //!< []
kTranslateX_PathTransformType, //!< [kMTransX]
kTranslateY_PathTransformType, //!< [kMTransY]
kTranslate_PathTransformType, //!< [kMTransX, kMTransY]
kAffine_PathTransformType, //!< [kMScaleX, kMSkewX, kMTransX, kMSkewY, kMScaleY, kMTransY]
kLast_PathTransformType = kAffine_PathTransformType
};
static inline int PathTransformSize(PathTransformType type) {
switch (type) {
case kNone_PathTransformType:
return 0;
case kTranslateX_PathTransformType:
case kTranslateY_PathTransformType:
return 1;
case kTranslate_PathTransformType:
return 2;
case kAffine_PathTransformType:
return 6;
default:
SkFAIL("Unknown path transform type");
return 0;
}
}
virtual GrPath* createPath(const SkPath&, const SkStrokeRec&) = 0;
virtual GrPathRange* createPathRange(size_t size, const SkStrokeRec&) = 0;
virtual void stencilPath(const GrPath*, SkPath::FillType) = 0;
virtual void drawPath(const GrPath*, SkPath::FillType) = 0;
virtual void drawPaths(const GrPathRange*, const uint32_t indices[], int count,
const float transforms[], PathTransformType, SkPath::FillType) = 0;
protected:
GrPathRendering() { }
private:
GrPathRendering& operator=(const GrPathRendering&);
};
#endif
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