1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #ifndef GrStencilBuffer_DEFINED 11 #define GrStencilBuffer_DEFINED 12 13 #include "GrClipData.h" 14 #include "GrResource.h" 15 16 class GrRenderTarget; 17 class GrResourceEntry; 18 class GrResourceKey; 19 20 class GrStencilBuffer : public GrResource { 21 public: 22 SK_DECLARE_INST_COUNT(GrStencilBuffer); 23 ~GrStencilBuffer()24 virtual ~GrStencilBuffer() { 25 // TODO: allow SB to be purged and detach itself from rts 26 } 27 width()28 int width() const { return fWidth; } height()29 int height() const { return fHeight; } bits()30 int bits() const { return fBits; } numSamples()31 int numSamples() const { return fSampleCnt; } 32 33 // called to note the last clip drawn to this buffer. setLastClip(int32_t clipStackGenID,const SkIRect & clipSpaceRect,const SkIPoint clipSpaceToStencilOffset)34 void setLastClip(int32_t clipStackGenID, 35 const SkIRect& clipSpaceRect, 36 const SkIPoint clipSpaceToStencilOffset) { 37 fLastClipStackGenID = clipStackGenID; 38 fLastClipStackRect = clipSpaceRect; 39 fLastClipSpaceOffset = clipSpaceToStencilOffset; 40 } 41 42 // called to determine if we have to render the clip into SB. mustRenderClip(int32_t clipStackGenID,const SkIRect & clipSpaceRect,const SkIPoint clipSpaceToStencilOffset)43 bool mustRenderClip(int32_t clipStackGenID, 44 const SkIRect& clipSpaceRect, 45 const SkIPoint clipSpaceToStencilOffset) const { 46 return fLastClipStackGenID != clipStackGenID || 47 fLastClipSpaceOffset != clipSpaceToStencilOffset || 48 !fLastClipStackRect.contains(clipSpaceRect); 49 } 50 51 // Places the sb in the cache. The cache takes a ref of the stencil buffer. 52 void transferToCache(); 53 54 static GrResourceKey ComputeKey(int width, int height, int sampleCnt); 55 56 protected: GrStencilBuffer(GrGpu * gpu,bool isWrapped,int width,int height,int bits,int sampleCnt)57 GrStencilBuffer(GrGpu* gpu, bool isWrapped, int width, int height, int bits, int sampleCnt) 58 : GrResource(gpu, isWrapped) 59 , fWidth(width) 60 , fHeight(height) 61 , fBits(bits) 62 , fSampleCnt(sampleCnt) 63 , fLastClipStackGenID(SkClipStack::kInvalidGenID) { 64 fLastClipStackRect.setEmpty(); 65 } 66 67 private: 68 69 int fWidth; 70 int fHeight; 71 int fBits; 72 int fSampleCnt; 73 74 int32_t fLastClipStackGenID; 75 SkIRect fLastClipStackRect; 76 SkIPoint fLastClipSpaceOffset; 77 78 typedef GrResource INHERITED; 79 }; 80 81 #endif 82