Tile Compression

cc/resources/resource_format.h

 // 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.
 
 #ifndef CC_RESOURCES_RESOURCE_FORMAT_H_
 #define CC_RESOURCES_RESOURCE_FORMAT_H_
 
 #include "base/logging.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace cc {
 
 // Keep in sync with arrays below.
 enum ResourceFormat {
   RGBA_8888,
   RGBA_4444,
   BGRA_8888,
   ALPHA_8,
   LUMINANCE_8,
   RGB_565,
+  ATC,
+  ATC_IA,
+  DXT1,
+  DXT5,
   ETC1,
   RED_8,
   RESOURCE_FORMAT_MAX = RED_8,
 };
 
 SkColorType ResourceFormatToSkColorType(ResourceFormat format);
 
+bool IsFormatCompressed(ResourceFormat format);
+
+enum ResourceFormatUsage {
+  FORMAT_USAGE_NATIVE,       // Fastest format. Also supported for GPU
+                             // rasterization.
+  FORMAT_USAGE_TRANSLUCENT,  // Memory efficient format that also supports alpha
+                             // channel.
+  FORMAT_USAGE_OPAQUE,       // Memory efficient format that only support color
+                             // channels.
+
+  NUM_RESOURCE_FORMAT_USAGE
+};
+
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_FORMAT_H_