1 files changed, 39 insertions, 0 deletions
diff --git a/chromium/cc/resources/resource.cc b/chromium/cc/resources/resource.cc
new file mode 100644
index 00000000000..192eaebddc6
--- /dev/null
+++ b/chromium/cc/resources/resource.cc
@@ -0,0 +1,39 @@
+// Copyright 2012 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/resource.h"
+#include "third_party/khronos/GLES2/gl2ext.h"
+
+namespace cc {
+
+size_t Resource::bytes() const {
+  if (size_.IsEmpty())
+    return 0;
+
+  return MemorySizeBytes(size_, format_);
+}
+
+size_t Resource::BytesPerPixel(GLenum format) {
+  size_t components_per_pixel = 0;
+  size_t bytes_per_component = 1;
+  switch (format) {
+    case GL_RGBA:
+    case GL_BGRA_EXT:
+      components_per_pixel = 4;
+      break;
+    case GL_LUMINANCE:
+      components_per_pixel = 1;
+      break;
+    default:
+      NOTREACHED();
+  }
+  return components_per_pixel * bytes_per_component;
+}
+
+size_t Resource::MemorySizeBytes(gfx::Size size, GLenum format) {
+  return BytesPerPixel(format) * size.width() * size.height();
+}
+
+
+}  // namespace cc