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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SKIA_EXT_LAZY_PIXEL_REF_H_
#define SKIA_EXT_LAZY_PIXEL_REF_H_
#include "third_party/skia/include/core/SkPixelRef.h"
#include "third_party/skia/include/core/SkRect.h"
namespace skia {
// This class extends SkPixelRef to facilitate lazy image decoding on the impl
// thread.
class SK_API LazyPixelRef : public SkPixelRef {
public:
explicit LazyPixelRef(const SkImageInfo& info);
virtual ~LazyPixelRef();
struct PrepareParams {
// Clipping rect for this pixel ref.
SkIRect clip_rect;
};
// Request the ImageDecodingStore to prepare image decoding for the
// given clipping rect. Returns true is succeeded, or false otherwise.
virtual bool PrepareToDecode(const PrepareParams& params) = 0;
// Returns true if this pixel ref is already in the ImageDecodingStore's
// cache, false otherwise. Much cheaper than PrepareToDecode().
virtual bool MaybeDecoded() = 0;
// Start decoding the image.
virtual void Decode() = 0;
};
} // namespace skia
#endif // SKIA_EXT_LAZY_PIXEL_REF_H_
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