1 /*
2 * Copyright (C) 2012 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "platform/graphics/LazyDecodingPixelRef.h"
28
29 #include "SkData.h"
30 #include "platform/TraceEvent.h"
31 #include "platform/graphics/ImageDecodingStore.h"
32 #include "platform/graphics/ImageFrameGenerator.h"
33
34 namespace WebCore {
35
LazyDecodingPixelRef(const SkImageInfo & info,PassRefPtr<ImageFrameGenerator> frameGenerator,size_t index)36 LazyDecodingPixelRef::LazyDecodingPixelRef(const SkImageInfo& info, PassRefPtr<ImageFrameGenerator> frameGenerator, size_t index)
37 : LazyPixelRef(info)
38 , m_frameGenerator(frameGenerator)
39 , m_frameIndex(index)
40 , m_lockedImageResource(0)
41 , m_objectTracker(this)
42 {
43 }
44
~LazyDecodingPixelRef()45 LazyDecodingPixelRef::~LazyDecodingPixelRef()
46 {
47 }
48
onRefEncodedData()49 SkData* LazyDecodingPixelRef::onRefEncodedData()
50 {
51 // If the image has been clipped or scaled, do not return the original encoded data, since
52 // on playback it will not be known how the clipping/scaling was done.
53 RefPtr<SharedBuffer> buffer = nullptr;
54 bool allDataReceived = false;
55 m_frameGenerator->copyData(&buffer, &allDataReceived);
56 if (buffer && allDataReceived) {
57 SkData* skdata = SkData::NewWithCopy((void*)buffer->data(), buffer->size());
58 return skdata;
59 }
60 return 0;
61 }
62
onNewLockPixels(LockRec * rec)63 bool LazyDecodingPixelRef::onNewLockPixels(LockRec* rec)
64 {
65 TRACE_EVENT_ASYNC_BEGIN0("webkit", "LazyDecodingPixelRef::onNewLockPixels", this);
66
67 ASSERT(!m_lockedImageResource);
68
69 SkISize size = m_frameGenerator->getFullSize();
70 if (!ImageDecodingStore::instance()->lockCache(m_frameGenerator.get(), size, m_frameIndex, &m_lockedImageResource))
71 m_lockedImageResource = 0;
72
73 // Use ImageFrameGenerator to generate the image. It will lock the cache
74 // entry for us.
75 if (!m_lockedImageResource) {
76 PlatformInstrumentation::willDecodeLazyPixelRef(getGenerationID());
77 m_lockedImageResource = m_frameGenerator->decodeAndScale(size, m_frameIndex);
78 PlatformInstrumentation::didDecodeLazyPixelRef();
79 }
80 if (!m_lockedImageResource)
81 return false;
82
83 ASSERT(!m_lockedImageResource->bitmap().isNull());
84 ASSERT(m_lockedImageResource->scaledSize() == size);
85 rec->fPixels = m_lockedImageResource->bitmap().getAddr(0, 0);
86 rec->fColorTable = 0;
87 rec->fRowBytes = m_lockedImageResource->bitmap().rowBytes();
88 return true;
89 }
90
onUnlockPixels()91 void LazyDecodingPixelRef::onUnlockPixels()
92 {
93 if (m_lockedImageResource) {
94 ImageDecodingStore::instance()->unlockCache(m_frameGenerator.get(), m_lockedImageResource);
95 m_lockedImageResource = 0;
96 }
97
98 TRACE_EVENT_ASYNC_END0("webkit", "LazyDecodingPixelRef::lockPixels", this);
99 }
100
onLockPixelsAreWritable() const101 bool LazyDecodingPixelRef::onLockPixelsAreWritable() const
102 {
103 return false;
104 }
105
MaybeDecoded()106 bool LazyDecodingPixelRef::MaybeDecoded()
107 {
108 return ImageDecodingStore::instance()->isCached(m_frameGenerator.get(), m_frameGenerator->getFullSize(), m_frameIndex);
109 }
110
PrepareToDecode(const LazyPixelRef::PrepareParams & params)111 bool LazyDecodingPixelRef::PrepareToDecode(const LazyPixelRef::PrepareParams& params)
112 {
113 ASSERT(false);
114 return false;
115 }
116
Decode()117 void LazyDecodingPixelRef::Decode()
118 {
119 lockPixels();
120 unlockPixels();
121 }
122
123
124 } // namespace blink
125