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 GrPictureUtils_DEFINED
9#define GrPictureUtils_DEFINED
10
11#include "SkPicture.h"
12#include "SkTDArray.h"
13
14// This class encapsulates the GPU-backend-specific acceleration data
15// for a single SkPicture
16class GPUAccelData : public SkPicture::AccelData {
17public:
18    // Information about a given saveLayer in an SkPicture
19    struct SaveLayerInfo {
20        // True if the SaveLayerInfo is valid. False if either 'fOffset' is
21        // invalid (due to a non-invertible CTM) or 'fPaint' is NULL (due
22        // to a non-copyable paint).
23        bool fValid;
24        // The size of the saveLayer
25        SkISize fSize;
26        // The CTM in which this layer's draws must occur. It already incorporates
27        // the translation needed to map the layer's top-left point to the origin.
28        SkMatrix fCTM;
29        // The offset that needs to be passed to drawBitmap to correctly
30        // position the pre-rendered layer. It is in device space.
31        SkIPoint fOffset;
32        // The paint to use on restore. NULL if the paint was not copyable (and
33        // thus that this layer should not be pulled forward).
34        const SkPaint* fPaint;
35        // The ID of this saveLayer in the picture. 0 is an invalid ID.
36        size_t  fSaveLayerOpID;
37        // The ID of the matching restore in the picture. 0 is an invalid ID.
38        size_t  fRestoreOpID;
39        // True if this saveLayer has at least one other saveLayer nested within it.
40        // False otherwise.
41        bool    fHasNestedLayers;
42        // True if this saveLayer is nested within another. False otherwise.
43        bool    fIsNested;
44    };
45
46    GPUAccelData(Key key) : INHERITED(key) { }
47
48    virtual ~GPUAccelData() {
49        for (int i = 0; i < fSaveLayerInfo.count(); ++i) {
50            SkDELETE(fSaveLayerInfo[i].fPaint);
51        }
52    }
53
54    void addSaveLayerInfo(const SaveLayerInfo& info) {
55        SkASSERT(info.fSaveLayerOpID < info.fRestoreOpID);
56        *fSaveLayerInfo.push() = info;
57    }
58
59    int numSaveLayers() const { return fSaveLayerInfo.count(); }
60
61    const SaveLayerInfo& saveLayerInfo(int index) const {
62        SkASSERT(index < fSaveLayerInfo.count());
63
64        return fSaveLayerInfo[index];
65    }
66
67    // We may, in the future, need to pass in the GPUDevice in order to
68    // incorporate the clip and matrix state into the key
69    static SkPicture::AccelData::Key ComputeAccelDataKey();
70
71private:
72    SkTDArray<SaveLayerInfo> fSaveLayerInfo;
73
74    typedef SkPicture::AccelData INHERITED;
75};
76
77void GatherGPUInfo(const SkPicture* pict, GPUAccelData* accelData);
78
79#endif // GrPictureUtils_DEFINED
80