Video Color Managament

cc/output/color_lut_cache.h

+// Copyright 2016 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_OUTPUT_COLOR_LUT_CACHE_H_
+#define CC_OUTPUT_COLOR_LUT_CACHE_H_
+
+#include <map>
+
+#include "base/containers/mru_cache.h"
+#include "base/macros.h"
+#include "media/base/video_color_space.h"
+#include "ui/gfx/color_space.h"
+
+namespace gpu {
+namespace gles2 {
+class GLES2Interface;
+}
+}
+
+class ColorLUTCache {
+ public:
+  explicit ColorLUTCache(gpu::gles2::GLES2Interface* gl);
+  ~ColorLUTCache();
+
+  unsigned int GetLUT(const media::VideoColorSpace& from,
+                      const gfx::ColorSpace& to,
+                      int lut_samples);
+
+  // End of frame, assume all LUTs handed out are no longer used.
+  void Swap();
+
+ private:
+  unsigned int MakeLUT(const media::VideoColorSpace& from,
+                       const gfx::ColorSpace& to,
+                       int lut_samples);
+  typedef std::pair<media::VideoColorSpace, std::pair<gfx::ColorSpace, size_t>>
+      CacheKey;
+
+  base::MRUCache<CacheKey, std::pair<unsigned int, size_t>> lut_cache_;
+  uint32_t current_frame_;
+  gpu::gles2::GLES2Interface* gl_;
+  DISALLOW_COPY_AND_ASSIGN(ColorLUTCache);
+};
+
+#endif  // CC_OUTPUT_COLOR_LUT_CACHE_H_