1 /* 2 * Copyright 2014 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkLayerInfo_DEFINED 9 #define SkLayerInfo_DEFINED 10 11 #include "SkPicture.h" 12 #include "SkTArray.h" 13 14 // This class stores information about the saveLayer/restore pairs found 15 // within an SkPicture. It is used by Ganesh to perform layer hoisting. 16 class SkLayerInfo : public SkPicture::AccelData { 17 public: 18 // Information about a given saveLayer/restore block in an SkPicture 19 class BlockInfo { 20 public: BlockInfo()21 BlockInfo() : fPicture(NULL), fPaint(NULL), fKey(NULL), fKeySize(0) {} ~BlockInfo()22 ~BlockInfo() { SkSafeUnref(fPicture); SkDELETE(fPaint); SkDELETE_ARRAY(fKey); } 23 24 // The picture owning the layer. If the owning picture is the top-most 25 // one (i.e., the picture for which this SkLayerInfo was created) then 26 // this pointer is NULL. If it is a nested picture then the pointer 27 // is non-NULL and owns a ref on the picture. 28 const SkPicture* fPicture; 29 // The device space bounds of this layer. 30 SkRect fBounds; 31 // If not-empty, the optional bounds parameter passed in to the saveLayer 32 // call. 33 SkRect fSrcBounds; 34 // The pre-matrix begins as the identity and accumulates the transforms 35 // of the containing SkPictures (if any). This matrix state has to be 36 // part of the initial matrix during replay so that it will be 37 // preserved across setMatrix calls. 38 SkMatrix fPreMat; 39 // The matrix state (in the leaf picture) in which this layer's draws 40 // must occur. It will/can be overridden by setMatrix calls in the 41 // layer itself. It does not include the translation needed to map the 42 // layer's top-left point to the origin (which must be part of the 43 // initial matrix). 44 SkMatrix fLocalMat; 45 // The paint to use on restore. Can be NULL since it is optional. 46 const SkPaint* fPaint; 47 // The index of this saveLayer in the picture. 48 size_t fSaveLayerOpID; 49 // The index of the matching restore in the picture. 50 size_t fRestoreOpID; 51 // True if this saveLayer has at least one other saveLayer nested within it. 52 // False otherwise. 53 bool fHasNestedLayers; 54 // True if this saveLayer is nested within another. False otherwise. 55 bool fIsNested; 56 // The variable length key for this saveLayer block. It stores the 57 // thread of drawPicture and saveLayer operation indices that lead to this 58 // saveLayer (including its own op index). The BlockInfo owns this memory. 59 unsigned* fKey; 60 int fKeySize; // # of ints 61 }; 62 SkLayerInfo(Key key)63 SkLayerInfo(Key key) : INHERITED(key) { } 64 addBlock()65 BlockInfo& addBlock() { return fBlocks.push_back(); } 66 numBlocks()67 int numBlocks() const { return fBlocks.count(); } 68 block(int index)69 const BlockInfo& block(int index) const { 70 SkASSERT(index < fBlocks.count()); 71 72 return fBlocks[index]; 73 } 74 75 // We may, in the future, need to pass in the GPUDevice in order to 76 // incorporate the clip and matrix state into the key 77 static SkPicture::AccelData::Key ComputeKey(); 78 79 private: 80 SkTArray<BlockInfo, true> fBlocks; 81 82 typedef SkPicture::AccelData INHERITED; 83 }; 84 85 #endif // SkLayerInfo_DEFINED 86