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