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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrSWMaskHelper_DEFINED
#define GrSWMaskHelper_DEFINED
#include "SkAutoPixmapStorage.h"
#include "SkDraw.h"
#include "SkMatrix.h"
#include "SkRasterClip.h"
#include "SkRegion.h"
#include "SkTypes.h"
class GrShape;
class GrTextureProxy;
/**
* The GrSWMaskHelper helps generate clip masks using the software rendering
* path. It is intended to be used as:
*
* GrSWMaskHelper helper(context);
* helper.init(...);
*
* draw one or more paths/rects specifying the required boolean ops
*
* toTextureProxy(); // to get it from the internal bitmap to the GPU
*
* The result of this process will be the final mask (on the GPU) in the
* upper left hand corner of the texture.
*/
class GrSWMaskHelper : SkNoncopyable {
public:
GrSWMaskHelper(SkAutoPixmapStorage* pixels = nullptr)
: fPixels(pixels ? pixels : &fPixelsStorage) { }
// set up the internal state in preparation for draws. Since many masks
// may be accumulated in the helper during creation, "resultBounds"
// allows the caller to specify the region of interest - to limit the
// amount of work.
bool init(const SkIRect& resultBounds);
// Draw a single rect into the accumulation bitmap using the specified op
void drawRect(const SkRect& rect, const SkMatrix& matrix, SkRegion::Op op, GrAA, uint8_t alpha);
// Draw a single path into the accumuation bitmap using the specified op
void drawShape(const GrShape&, const SkMatrix& matrix, SkRegion::Op op, GrAA, uint8_t alpha);
sk_sp<GrTextureProxy> toTextureProxy(GrContext*, SkBackingFit fit);
// Reset the internal bitmap
void clear(uint8_t alpha) {
fPixels->erase(SkColorSetARGB(alpha, 0xFF, 0xFF, 0xFF));
}
private:
SkVector fTranslate;
SkAutoPixmapStorage* fPixels;
SkAutoPixmapStorage fPixelsStorage;
SkDraw fDraw;
SkRasterClip fRasterClip;
typedef SkNoncopyable INHERITED;
};
#endif // GrSWMaskHelper_DEFINED
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