SkPicturePlayback.h

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/*
 * Copyright 2014 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef SkPicturePlayback_DEFINED
#define SkPicturePlayback_DEFINED
 
#include "include/core/SkM44.h"
#include "include/core/SkPicture.h"
#include "include/private/base/SkNoncopyable.h"
#include "src/core/SkPictureFlat.h"
 
#include <cstddef>
#include <cstdint>
 
class SkCanvas;
class SkPictureData;
class SkReadBuffer;
 
// The basic picture playback class replays the provided picture into a canvas.
class SkPicturePlayback final : SkNoncopyable {
public:
    SkPicturePlayback(const SkPictureData* data)
        : fPictureData(data)
        , fCurOffset(0) {
    }
 
    void draw(SkCanvas* canvas, SkPicture::AbortCallback*, SkReadBuffer* buffer);
 
    // TODO: remove the curOp calls after cleaning up GrGatherDevice
    // Return the ID of the operation currently being executed when playing
    // back. 0 indicates no call is active.
    size_t curOpID() const { return fCurOffset; }
    void resetOpID() { fCurOffset = 0; }
 
private:
    const SkPictureData* fPictureData;
 
    // The offset of the current operation when within the draw method
    size_t fCurOffset;
 
    void handleOp(SkReadBuffer* reader,
                  DrawType op,
                  uint32_t size,
                  SkCanvas* canvas,
                  const SkM44& initialMatrix);
 
    class AutoResetOpID {
    public:
        AutoResetOpID(SkPicturePlayback* playback) : fPlayback(playback) { }
        ~AutoResetOpID() {
            if (fPlayback) {
                fPlayback->resetOpID();
            }
        }
 
    private:
        SkPicturePlayback* fPlayback;
    };
 
    using INHERITED = SkNoncopyable;
};
 
#endif