Refactor AcceleratedStaticBitmapImage

third_party/WebKit/Source/platform/graphics/TextureHolder.h

+// Copyright 2016 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 TextureHolder_h
+#define TextureHolder_h
+
+#include "gpu/command_buffer/common/mailbox.h"
+#include "gpu/command_buffer/common/sync_token.h"
+#include "platform/PlatformExport.h"
+#include "platform/WebTaskRunner.h"
+#include "platform/geometry/IntSize.h"
+#include "platform/graphics/Image.h"
+#include "third_party/skia/include/core/SkImage.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
+
+namespace blink {
+
+class PLATFORM_EXPORT TextureHolder {
+ public:
+  virtual ~TextureHolder() {}
+
+  // Methods overrided by all sub-classes
+  virtual bool isSkiaTextureHolder() = 0;
+  virtual bool isMailboxTextureHolder() = 0;
+  virtual unsigned sharedContextId() = 0;
+  virtual IntSize size() const = 0;
+  virtual bool currentFrameKnownToBeOpaque(Image::MetadataMode) = 0;
+
+  // Methods overrided by MailboxTextureHolder
+  virtual gpu::Mailbox mailbox() {
+    NOTREACHED();
+    return gpu::Mailbox();
+  }
+  virtual gpu::SyncToken syncToken() {
+    NOTREACHED();
+    return gpu::SyncToken();
+  }
+  virtual void updateSyncToken(gpu::SyncToken) { NOTREACHED(); }
+
+  // Methods overrided by SkiaTextureHolder
+  virtual sk_sp<SkImage> skImage() {
+    NOTREACHED();
+    return nullptr;
+  }
+  virtual void setSharedContextId(unsigned) { NOTREACHED(); }
+  virtual void setImageThread(WebThread*) { NOTREACHED(); }
+  virtual void setImageThreadTaskRunner(std::unique_ptr<WebTaskRunner>) {
+    NOTREACHED();
+  }
+
+  // Methods that have exactly the same impelmentation for all sub-classes
+  bool wasTransferred() { return m_wasTransferred; }
+  WebTaskRunner* textureThreadTaskRunner() {
+    return m_textureThreadTaskRunner.get();
+  }
+  void setWasTransferred(bool flag) { m_wasTransferred = flag; }
+  void setTextureThreadTaskRunner(std::unique_ptr<WebTaskRunner> taskRunner) {
+    m_textureThreadTaskRunner = std::move(taskRunner);
+  }
+
+ private:
+  // Wether the AcceleratedStaticBitmapImage that holds the |m_texture| was
+  // transferred to another thread or not. Set to false when the
+  // AcceleratedStaticBitmapImage remain on the same thread as it was craeted.
+  bool m_wasTransferred = false;
+  // Keep a clone of the WebTaskRunner. This is to handle the case where the
+  // AcceleratedStaticBitmapImage was created on one thread and transferred to
+  // another thread, and the original thread gone out of scope, and that we need
+  // to clear the resouces associated with that AcceleratedStaticBitmapImage on
+  // the original thread.
+  std::unique_ptr<WebTaskRunner> m_textureThreadTaskRunner;
+};
+
+}  // namespace blink
+
+#endif  // TextureHolder_h