michael@0: 
michael@0: /*
michael@0:  * Copyright 2011 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #ifndef GrStencilBuffer_DEFINED
michael@0: #define GrStencilBuffer_DEFINED
michael@0: 
michael@0: #include "GrClipData.h"
michael@0: #include "GrResource.h"
michael@0: 
michael@0: class GrRenderTarget;
michael@0: class GrResourceEntry;
michael@0: class GrResourceKey;
michael@0: 
michael@0: class GrStencilBuffer : public GrResource {
michael@0: public:
michael@0:     SK_DECLARE_INST_COUNT(GrStencilBuffer);
michael@0: 
michael@0:     virtual ~GrStencilBuffer() {
michael@0:         // TODO: allow SB to be purged and detach itself from rts
michael@0:     }
michael@0: 
michael@0:     int width() const { return fWidth; }
michael@0:     int height() const { return fHeight; }
michael@0:     int bits() const { return fBits; }
michael@0:     int numSamples() const { return fSampleCnt; }
michael@0: 
michael@0:     // called to note the last clip drawn to this buffer.
michael@0:     void setLastClip(int32_t clipStackGenID,
michael@0:                      const SkIRect& clipSpaceRect,
michael@0:                      const SkIPoint clipSpaceToStencilOffset) {
michael@0:         fLastClipStackGenID = clipStackGenID;
michael@0:         fLastClipStackRect = clipSpaceRect;
michael@0:         fLastClipSpaceOffset = clipSpaceToStencilOffset;
michael@0:     }
michael@0: 
michael@0:     // called to determine if we have to render the clip into SB.
michael@0:     bool mustRenderClip(int32_t clipStackGenID,
michael@0:                         const SkIRect& clipSpaceRect,
michael@0:                         const SkIPoint clipSpaceToStencilOffset) const {
michael@0:         return fLastClipStackGenID != clipStackGenID ||
michael@0:                fLastClipSpaceOffset != clipSpaceToStencilOffset ||
michael@0:                !fLastClipStackRect.contains(clipSpaceRect);
michael@0:     }
michael@0: 
michael@0:     // Places the sb in the cache. The cache takes a ref of the stencil buffer.
michael@0:     void transferToCache();
michael@0: 
michael@0:     static GrResourceKey ComputeKey(int width, int height, int sampleCnt);
michael@0: 
michael@0: protected:
michael@0:     GrStencilBuffer(GrGpu* gpu, bool isWrapped, int width, int height, int bits, int sampleCnt)
michael@0:         : GrResource(gpu, isWrapped)
michael@0:         , fWidth(width)
michael@0:         , fHeight(height)
michael@0:         , fBits(bits)
michael@0:         , fSampleCnt(sampleCnt)
michael@0:         , fLastClipStackGenID(SkClipStack::kInvalidGenID) {
michael@0:         fLastClipStackRect.setEmpty();
michael@0:     }
michael@0: 
michael@0: private:
michael@0: 
michael@0:     int fWidth;
michael@0:     int fHeight;
michael@0:     int fBits;
michael@0:     int fSampleCnt;
michael@0: 
michael@0:     int32_t     fLastClipStackGenID;
michael@0:     SkIRect     fLastClipStackRect;
michael@0:     SkIPoint    fLastClipSpaceOffset;
michael@0: 
michael@0:     typedef GrResource INHERITED;
michael@0: };
michael@0: 
michael@0: #endif