cc/resources/platform_color.h

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_RESOURCES_PLATFORM_COLOR_H_
   6 #define CC_RESOURCES_PLATFORM_COLOR_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/logging.h"
  10 #include "cc/resources/resource_format.h"
  11 #include "third_party/khronos/GLES2/gl2.h"
  12 #include "third_party/khronos/GLES2/gl2ext.h"
  13 #include "third_party/skia/include/core/SkTypes.h"
  14
  15 namespace cc {
  16
  17 class PlatformColor {
  18  public:
  19   enum SourceDataFormat {
  20     SOURCE_FORMAT_RGBA8,
  21     SOURCE_FORMAT_BGRA8
  22   };
  23
  24   static SourceDataFormat Format() {
  25     return SK_B32_SHIFT ? SOURCE_FORMAT_RGBA8 : SOURCE_FORMAT_BGRA8;
  26   }
  27
  28   // Returns the most efficient texture format for this platform.
  29   static ResourceFormat BestTextureFormat(bool supports_bgra8888) {
  30     switch (Format()) {
  31       case SOURCE_FORMAT_BGRA8:
  32         return (supports_bgra8888) ? BGRA_8888 : RGBA_8888;
  33       case SOURCE_FORMAT_RGBA8:
  34         return RGBA_8888;
  35     }
  36     NOTREACHED();
  37     return RGBA_8888;
  38   }
  39
  40   // Return true if the given texture format has the same component order
  41   // as the color on this platform.
  42   static bool SameComponentOrder(ResourceFormat format) {
  43     switch (Format()) {
  44       case SOURCE_FORMAT_RGBA8:
  45         return format == RGBA_8888 || format == RGBA_4444;
  46       case SOURCE_FORMAT_BGRA8:
  47         return format == BGRA_8888 || format == RGBA_4444;
  48     }
  49     NOTREACHED();
  50     return false;
  51   }
  52
  53  private:
  54   DISALLOW_IMPLICIT_CONSTRUCTORS(PlatformColor);
  55 };
  56
  57 }  // namespace cc
  58
  59 #endif  // CC_RESOURCES_PLATFORM_COLOR_H_