1 files changed, 49 insertions, 0 deletions
diff --git a/cc/resource.cc b/cc/resource.cc
new file mode 100644
index 0000000..0995793
--- /dev/null
+++ b/cc/resource.cc
@@ -0,0 +1,49 @@
+// 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 "config.h"
+
+#include "cc/resource.h"
+#include "third_party/khronos/GLES2/gl2ext.h"
+
+namespace cc {
+
+void Resource::setDimensions(const gfx::Size& size, GLenum format)
+{
+    m_size = size;
+    m_format = format;
+}
+
+size_t Resource::bytes() const
+{
+    if (m_size.IsEmpty())
+        return 0u;
+
+    return memorySizeBytes(m_size, m_format);
+}
+
+size_t Resource::bytesPerPixel(GLenum format)
+{
+    unsigned int componentsPerPixel = 0;
+    unsigned int bytesPerComponent = 1;
+    switch (format) {
+    case GL_RGBA:
+    case GL_BGRA_EXT:
+        componentsPerPixel = 4;
+        break;
+    case GL_LUMINANCE:
+        componentsPerPixel = 1;
+        break;
+    default:
+        NOTREACHED();
+    }
+    return componentsPerPixel * bytesPerComponent;
+}
+
+size_t Resource::memorySizeBytes(const gfx::Size& size, GLenum format)
+{
+    return bytesPerPixel(format) * size.width() * size.height();
+}
+
+}  // namespace cc