| // 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_ |