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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "platform/graphics/OffscreenCanvasPlaceholder.h" |
| 6 |
| 7 #include "platform/CrossThreadFunctional.h" |
| 8 #include "platform/WebTaskRunner.h" |
| 9 #include "platform/graphics/Image.h" |
| 10 #include "platform/graphics/OffscreenCanvasFrameDispatcher.h" |
| 11 #include "wtf/HashMap.h" |
| 12 |
| 13 namespace { |
| 14 |
| 15 typedef HashMap<int, blink::OffscreenCanvasPlaceholder*> PlaceholderIdMap; |
| 16 |
| 17 PlaceholderIdMap& placeholderRegistry() { |
| 18 DCHECK(isMainThread()); |
| 19 DEFINE_STATIC_LOCAL(PlaceholderIdMap, s_placeholderRegistry, ()); |
| 20 return s_placeholderRegistry; |
| 21 } |
| 22 |
| 23 void releaseFrameToDispatcher( |
| 24 WeakPtr<blink::OffscreenCanvasFrameDispatcher> dispatcher, |
| 25 RefPtr<blink::Image> oldImage, |
| 26 unsigned resourceId) { |
| 27 oldImage = nullptr; // Needed to unref'ed on the right thread |
| 28 if (dispatcher) { |
| 29 dispatcher->reclaimResource(resourceId); |
| 30 } |
| 31 } |
| 32 |
| 33 } // unnamed namespace |
| 34 |
| 35 namespace blink { |
| 36 |
| 37 OffscreenCanvasPlaceholder::~OffscreenCanvasPlaceholder() { |
| 38 unregisterPlaceholder(); |
| 39 } |
| 40 |
| 41 OffscreenCanvasPlaceholder* OffscreenCanvasPlaceholder::getPlaceholderById( |
| 42 unsigned placeholderId) { |
| 43 PlaceholderIdMap::iterator it = placeholderRegistry().find(placeholderId); |
| 44 if (it == placeholderRegistry().end()) |
| 45 return nullptr; |
| 46 return it->value; |
| 47 } |
| 48 |
| 49 void OffscreenCanvasPlaceholder::registerPlaceholder(unsigned placeholderId) { |
| 50 DCHECK(!placeholderRegistry().contains(placeholderId)); |
| 51 DCHECK(!isPlaceholderRegistered()); |
| 52 placeholderRegistry().add(placeholderId, this); |
| 53 m_placeholderId = placeholderId; |
| 54 } |
| 55 |
| 56 void OffscreenCanvasPlaceholder::unregisterPlaceholder() { |
| 57 if (!isPlaceholderRegistered()) |
| 58 return; |
| 59 DCHECK(placeholderRegistry().find(m_placeholderId)->value == this); |
| 60 placeholderRegistry().remove(m_placeholderId); |
| 61 m_placeholderId = kNoPlaceholderId; |
| 62 } |
| 63 |
| 64 void OffscreenCanvasPlaceholder::setPlaceholderFrame( |
| 65 RefPtr<Image> newFrame, |
| 66 WeakPtr<OffscreenCanvasFrameDispatcher> dispatcher, |
| 67 std::unique_ptr<WebTaskRunner> taskRunner, |
| 68 unsigned resourceId) { |
| 69 DCHECK(isPlaceholderRegistered()); |
| 70 releasePlaceholderFrame(); |
| 71 m_placeholderFrame = std::move(newFrame); |
| 72 m_frameDispatcher = std::move(dispatcher); |
| 73 m_frameDispatcherTaskRunner = std::move(taskRunner); |
| 74 m_placeholderFrameResourceId = resourceId; |
| 75 } |
| 76 |
| 77 void OffscreenCanvasPlaceholder::releasePlaceholderFrame() { |
| 78 DCHECK(isPlaceholderRegistered()); |
| 79 if (m_placeholderFrame) { |
| 80 m_placeholderFrame->transfer(); |
| 81 m_frameDispatcherTaskRunner->postTask( |
| 82 BLINK_FROM_HERE, |
| 83 crossThreadBind(releaseFrameToDispatcher, std::move(m_frameDispatcher), |
| 84 std::move(m_placeholderFrame), |
| 85 m_placeholderFrameResourceId)); |
| 86 } |
| 87 } |
| 88 |
| 89 } // blink |
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