color: Towards ColorTransform optimizations and code generation

ui/gfx/skia_color_space_util.h

+// Copyright 2017 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 UI_GFX_SKIA_COLOR_SPACE_UTIL_H_
+#define UI_GFX_SKIA_COLOR_SPACE_UTIL_H_
+
+#include "third_party/skia/include/core/SkColorSpace.h"
+#include "ui/gfx/gfx_export.h"
+
+namespace gfx {
+
+float GFX_EXPORT EvalSkTransferFn(const SkColorSpaceTransferFn& fn, float x);
+
+SkColorSpaceTransferFn GFX_EXPORT
+SkTransferFnInverse(const SkColorSpaceTransferFn& fn);
+
+bool GFX_EXPORT
+SkTransferFnIsApproximatelyIdentity(const SkColorSpaceTransferFn& fn);
+
+bool GFX_EXPORT
+SkTransferFnsApproximatelyCancel(const SkColorSpaceTransferFn& a,
+                                 const SkColorSpaceTransferFn& b);
+
+bool GFX_EXPORT SkMatrixIsApproximatelyIdentity(const SkMatrix44& m);
+
+}  // namespace gfx
+
+#endif  // UI_GFX_SKIA_COLOR_SPACE_UTIL_H_