2 * Copyright (C) 2012 Google Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 #ifndef ImageFrameGenerator_h
27 #define ImageFrameGenerator_h
32 #include "platform/PlatformExport.h"
33 #include "platform/graphics/ThreadSafeDataTransport.h"
34 #include "wtf/PassOwnPtr.h"
35 #include "wtf/PassRefPtr.h"
36 #include "wtf/RefCounted.h"
37 #include "wtf/RefPtr.h"
38 #include "wtf/ThreadingPrimitives.h"
39 #include "wtf/ThreadSafeRefCounted.h"
40 #include "wtf/Vector.h"
45 class ScaledImageFragment;
48 class PLATFORM_EXPORT ImageDecoderFactory {
49 WTF_MAKE_NONCOPYABLE(ImageDecoderFactory);
51 ImageDecoderFactory() {}
52 virtual ~ImageDecoderFactory() { }
53 virtual PassOwnPtr<ImageDecoder> create() = 0;
56 class PLATFORM_EXPORT ImageFrameGenerator : public ThreadSafeRefCounted<ImageFrameGenerator> {
57 WTF_MAKE_NONCOPYABLE(ImageFrameGenerator);
59 static PassRefPtr<ImageFrameGenerator> create(const SkISize& fullSize, PassRefPtr<SharedBuffer> data, bool allDataReceived, bool isMultiFrame = false)
61 return adoptRef(new ImageFrameGenerator(fullSize, data, allDataReceived, isMultiFrame));
64 ImageFrameGenerator(const SkISize& fullSize, PassRefPtr<SharedBuffer>, bool allDataReceived, bool isMultiFrame);
65 ~ImageFrameGenerator();
67 const ScaledImageFragment* decodeAndScale(const SkISize& scaledSize, size_t index = 0);
69 // Decodes and scales the specified frame indicated by |index|. Dimensions
70 // and output format are specified in |info|. Decoded pixels are written
71 // into |pixels| with a stride of |rowBytes|.
73 // Returns true if decoding was successful.
74 bool decodeAndScale(const SkImageInfo&, size_t index, void* pixels, size_t rowBytes);
76 void setData(PassRefPtr<SharedBuffer>, bool allDataReceived);
78 // Creates a new SharedBuffer containing the data received so far.
79 void copyData(RefPtr<SharedBuffer>*, bool* allDataReceived);
81 SkISize getFullSize() const { return m_fullSize; }
83 bool isMultiFrame() const { return m_isMultiFrame; }
85 // FIXME: Return alpha state for each frame.
86 bool hasAlpha(size_t);
89 class ExternalMemoryAllocator;
90 friend class ImageFrameGeneratorTest;
91 friend class DeferredImageDecoderTest;
92 // For testing. |factory| will overwrite the default ImageDecoder creation logic if |factory->create()| returns non-zero.
93 void setImageDecoderFactory(PassOwnPtr<ImageDecoderFactory> factory) { m_imageDecoderFactory = factory; }
95 SkBitmap::Allocator* allocator() const { return m_discardableAllocator.get(); }
96 void setAllocator(PassOwnPtr<SkBitmap::Allocator> allocator) { m_discardableAllocator = allocator; }
98 // These methods are called while m_decodeMutex is locked.
99 const ScaledImageFragment* tryToLockCompleteCache(const SkISize& scaledSize, size_t index);
100 const ScaledImageFragment* tryToResumeDecode(const SkISize& scaledSize, size_t index);
102 // Use the given decoder to decode. If a decoder is not given then try to create one.
103 PassOwnPtr<ScaledImageFragment> decode(size_t index, ImageDecoder**);
105 // Return the next generation ID of a new image object. This is used
106 // to identify images of the same frame from different stages of
107 // progressive decode.
108 size_t nextGenerationId() { return m_decodeCount++; }
111 ThreadSafeDataTransport m_data;
113 bool m_decodeFailedAndEmpty;
114 Vector<bool> m_hasAlpha;
115 size_t m_decodeCount;
116 OwnPtr<SkBitmap::Allocator> m_discardableAllocator;
117 OwnPtr<ExternalMemoryAllocator> m_externalAllocator;
119 OwnPtr<ImageDecoderFactory> m_imageDecoderFactory;
121 // Prevents multiple decode operations on the same data.
124 // Protect concurrent access to m_hasAlpha.
128 } // namespace WebCore