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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 GrClipMaskManager_DEFINED
#define GrClipMaskManager_DEFINED
#include "GrRect.h"
class GrGpu;
class GrClip;
class GrPathRenderer;
class GrPathRendererChain;
class SkPath;
/**
* Scissoring needs special handling during stencil clip mask creation
* since the creation process re-entrantly invokes setupClipAndFlushState.
* During this process the call stack is used to keep
* track of (and apply to the GPU) the current scissor settings.
*/
struct ScissoringSettings {
bool fEnableScissoring;
GrIRect fScissorRect;
void setupScissoring(GrGpu* gpu);
};
/**
* The clip mask creator handles the generation of the clip mask. If anti
* aliasing is requested it will (in the future) generate a single channel
* (8bit) mask. If no anti aliasing is requested it will generate a 1-bit
* mask in the stencil buffer. In the non anti-aliasing case, if the clip
* mask can be represented as a rectangle then scissoring is used. In all
* cases scissoring is used to bound the range of the clip mask.
*/
class GrClipMaskManager {
public:
GrClipMaskManager()
: fClipMaskInStencil(false)
, fPathRendererChain(NULL) {
}
bool createClipMask(GrGpu* gpu,
const GrClip& clip,
ScissoringSettings* scissorSettings);
void freeResources();
bool isClipInStencil() const { return fClipMaskInStencil; }
void resetMask() {
fClipMaskInStencil = false;
}
protected:
private:
bool fClipMaskInStencil; // is the clip mask in the stencil buffer?
// must be instantiated after GrGpu object has been given its owning
// GrContext ptr. (GrGpu is constructed first then handed off to GrContext).
GrPathRendererChain* fPathRendererChain;
bool createStencilClipMask(GrGpu* gpu,
const GrClip& clip,
const GrRect& bounds,
ScissoringSettings* scissorSettings);
// determines the path renderer used to draw a clip path element.
GrPathRenderer* getClipPathRenderer(GrGpu* gpu,
const SkPath& path,
GrPathFill fill);
};
#endif // GrClipMaskManager_DEFINED
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