src/third_party/skia/src/core/SkPicturePlayback.h

   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 SkPicturePlayback_DEFINED
   9 #define SkPicturePlayback_DEFINED
  10
  11 #include "SkPictureFlat.h"  // for DrawType
  12
  13 class SkBitmap;
  14 class SkCanvas;
  15 class SkDrawPictureCallback;
  16 class SkPaint;
  17 class SkPictureData;
  18
  19 // The basic picture playback class replays the provided picture into a canvas.
  20 class SkPicturePlayback : SkNoncopyable {
  21 public:
  22     SkPicturePlayback(const SkPicture* picture)
  23         : fPictureData(picture->fData.get())
  24         , fCurOffset(0) {
  25     }
  26     virtual ~SkPicturePlayback() { }
  27
  28     virtual void draw(SkCanvas* canvas, SkDrawPictureCallback*);
  29
  30     // TODO: remove the curOp calls after cleaning up GrGatherDevice
  31     // Return the ID of the operation currently being executed when playing
  32     // back. 0 indicates no call is active.
  33     size_t curOpID() const { return fCurOffset; }
  34     void resetOpID() { fCurOffset = 0; }
  35
  36 protected:
  37     const SkPictureData* fPictureData;
  38
  39     // The offset of the current operation when within the draw method
  40     size_t fCurOffset;
  41
  42     void handleOp(SkReader32* reader,
  43                   DrawType op,
  44                   uint32_t size,
  45                   SkCanvas* canvas,
  46                   const SkMatrix& initialMatrix);
  47
  48     static DrawType ReadOpAndSize(SkReader32* reader, uint32_t* size);
  49
  50     class AutoResetOpID {
  51     public:
  52         AutoResetOpID(SkPicturePlayback* playback) : fPlayback(playback) { }
  53         ~AutoResetOpID() {
  54             if (fPlayback) {
  55                 fPlayback->resetOpID();
  56             }
  57         }
  58
  59     private:
  60         SkPicturePlayback* fPlayback;
  61     };
  62
  63 private:
  64     typedef SkNoncopyable INHERITED;
  65 };
  66
  67 #endif