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      1 /*
      2  * Copyright 2015 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 SkBigPicture_DEFINED
      9 #define SkBigPicture_DEFINED
     10 
     11 #include "SkNoncopyable.h"
     12 #include "SkOnce.h"
     13 #include "SkPicture.h"
     14 #include "SkRect.h"
     15 #include "SkTemplates.h"
     16 
     17 class SkBBoxHierarchy;
     18 class SkMatrix;
     19 class SkRecord;
     20 
     21 // An implementation of SkPicture supporting an arbitrary number of drawing commands.
     22 class SkBigPicture final : public SkPicture {
     23 public:
     24     // An array of refcounted const SkPicture pointers.
     25     class SnapshotArray : ::SkNoncopyable {
     26     public:
     27         SnapshotArray(const SkPicture* pics[], int count) : fPics(pics), fCount(count) {}
     28         ~SnapshotArray() { for (int i = 0; i < fCount; i++) { fPics[i]->unref(); } }
     29 
     30         const SkPicture* const* begin() const { return fPics; }
     31         int count() const { return fCount; }
     32     private:
     33         SkAutoTMalloc<const SkPicture*> fPics;
     34         int fCount;
     35     };
     36 
     37     SkBigPicture(const SkRect& cull,
     38                  SkRecord*,            // We take ownership of the caller's ref.
     39                  SnapshotArray*,       // We take exclusive ownership.
     40                  SkBBoxHierarchy*,     // We take ownership of the caller's ref.
     41                  size_t approxBytesUsedBySubPictures);
     42 
     43 
     44 // SkPicture overrides
     45     void playback(SkCanvas*, AbortCallback*) const override;
     46     SkRect cullRect() const override;
     47     int approximateOpCount() const override;
     48     size_t approximateBytesUsed() const override;
     49     const SkBigPicture* asSkBigPicture() const override { return this; }
     50 
     51 // Used by GrLayerHoister
     52     void partialPlayback(SkCanvas*,
     53                          int start,
     54                          int stop,
     55                          const SkMatrix& initialCTM) const;
     56 // Used by GrRecordReplaceDraw
     57     const SkBBoxHierarchy* bbh() const { return fBBH.get(); }
     58     const SkRecord*     record() const { return fRecord.get(); }
     59 
     60 private:
     61     int drawableCount() const;
     62     SkPicture const* const* drawablePicts() const;
     63 
     64     const SkRect                         fCullRect;
     65     const size_t                         fApproxBytesUsedBySubPictures;
     66     sk_sp<const SkRecord>                fRecord;
     67     std::unique_ptr<const SnapshotArray> fDrawablePicts;
     68     sk_sp<const SkBBoxHierarchy>         fBBH;
     69 };
     70 
     71 #endif//SkBigPicture_DEFINED
     72