[Aura] Added Support for rendering software compositor frames as cc::TextureLayers.

cc/resources/texture_mailbox.cc

 // Copyright 2013 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.
 
 #include "cc/resources/texture_mailbox.h"
 
 #include "base/logging.h"
 #include "third_party/khronos/GLES2/gl2.h"
 
 namespace cc {
 
 TextureMailbox::TextureMailbox()
     : target_(GL_TEXTURE_2D),
-      sync_point_(0) {
+      sync_point_(0),
+      shared_memory_(NULL) {
 }
 
 TextureMailbox::TextureMailbox(
     const std::string& mailbox_name,
-    const ReleaseCallback& mailbox_callback)
-    : callback_(mailbox_callback),
+    const ReleaseCallback& callback)
+    : callback_(callback),
       target_(GL_TEXTURE_2D),
-      sync_point_(0) {
-  DCHECK(mailbox_name.empty() == mailbox_callback.is_null());
+      sync_point_(0),
+      shared_memory_(NULL) {
+  DCHECK(mailbox_name.empty() == callback.is_null());
   if (!mailbox_name.empty()) {
     CHECK(mailbox_name.size() == sizeof(name_.name));
     name_.SetName(reinterpret_cast<const int8*>(mailbox_name.data()));
   }
 }
 
 TextureMailbox::TextureMailbox(
     const gpu::Mailbox& mailbox_name,
-    const ReleaseCallback& mailbox_callback)
-    : callback_(mailbox_callback),
+    const ReleaseCallback& callback)
+    : callback_(callback),
       target_(GL_TEXTURE_2D),
-      sync_point_(0) {
-  DCHECK(mailbox_name.IsZero() == mailbox_callback.is_null());
+      sync_point_(0),
+      shared_memory_(NULL) {
+  DCHECK(mailbox_name.IsZero() == callback.is_null());
   name_.SetName(mailbox_name.name);
 }
 
 TextureMailbox::TextureMailbox(
     const gpu::Mailbox& mailbox_name,
-    const ReleaseCallback& mailbox_callback,
+    const ReleaseCallback& callback,
     unsigned sync_point)
-    : callback_(mailbox_callback),
+    : callback_(callback),
       target_(GL_TEXTURE_2D),
-      sync_point_(sync_point) {
-  DCHECK(mailbox_name.IsZero() == mailbox_callback.is_null());
+      sync_point_(sync_point),
+      shared_memory_(NULL) {
+  DCHECK(mailbox_name.IsZero() == callback.is_null());
   name_.SetName(mailbox_name.name);
 }
 
 TextureMailbox::TextureMailbox(
     const gpu::Mailbox& mailbox_name,
-    const ReleaseCallback& mailbox_callback,
+    const ReleaseCallback& callback,
     unsigned texture_target,
     unsigned sync_point)
-    : callback_(mailbox_callback),
+    : callback_(callback),
       target_(texture_target),
-      sync_point_(sync_point) {
-  DCHECK(mailbox_name.IsZero() == mailbox_callback.is_null());
+      sync_point_(sync_point),
+      shared_memory_(NULL) {
+  DCHECK(mailbox_name.IsZero() == callback.is_null());
   name_.SetName(mailbox_name.name);
 }
 
+TextureMailbox::TextureMailbox(
+    base::SharedMemory* shared_memory,
+    gfx::Size size,
+    const ReleaseCallback& callback)
+    : callback_(callback),
+      target_(GL_TEXTURE_2D),
+      sync_point_(0),
+      shared_memory_(shared_memory),
+      shared_memory_size_(size) {
+}
+
 TextureMailbox::~TextureMailbox() {
 }
 
-bool TextureMailbox::Equals(const gpu::Mailbox& other) const {
-  return !memcmp(data(), other.name, sizeof(name_.name));
+bool TextureMailbox::Equals(const TextureMailbox& other) const {
+  if (other.IsTexture())
+    return ContainsMailbox(other.name());
+  else if (other.IsSharedMemory())
+    return ContainsHandle(other.shared_memory_->handle());
+
+  DCHECK(!other.IsValid());
+  return !IsValid();
 }
 
-bool TextureMailbox::Equals(const TextureMailbox& other) const {
-  return Equals(other.name());
+bool TextureMailbox::ContainsMailbox(const gpu::Mailbox& other) const {
+  return IsTexture() && !memcmp(data(), other.name, sizeof(name_.name));
 }
 
-bool TextureMailbox::IsEmpty() const {
-  return name_.IsZero();
+bool TextureMailbox::ContainsHandle(base::SharedMemoryHandle handle) const {
+  return shared_memory_ && shared_memory_->handle() == handle;
 }
 
 void TextureMailbox::RunReleaseCallback(unsigned sync_point,
                                         bool lost_resource) const {
   if (!callback_.is_null())
     callback_.Run(sync_point, lost_resource);
 }
 
 void TextureMailbox::SetName(const gpu::Mailbox& other) {
+  DCHECK(shared_memory_ == NULL);
   name_.SetName(other.name);
 }
 
+TextureMailbox TextureMailbox::CopyWithNewCallback(
+    const ReleaseCallback& callback) const {
+  TextureMailbox result(*this);
+  result.callback_ = callback;
+  return result;
+}
+
+size_t TextureMailbox::shared_memory_size_in_bytes() const {
+  return 4 * shared_memory_size_.GetArea();
+}
+
 }  // namespace cc