| // 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 "third_party/skia/include/core/SkICC.h" |
| #include "ui/gfx/color_space_export.h" |
| |
| namespace gfx { |
| |
| float COLOR_SPACE_EXPORT SkTransferFnEval(const SkColorSpaceTransferFn& fn, |
| float x); |
| |
| SkColorSpaceTransferFn COLOR_SPACE_EXPORT |
| SkTransferFnInverse(const SkColorSpaceTransferFn& fn); |
| |
| bool COLOR_SPACE_EXPORT |
| SkTransferFnsApproximatelyCancel(const SkColorSpaceTransferFn& a, |
| const SkColorSpaceTransferFn& b); |
| |
| bool COLOR_SPACE_EXPORT |
| SkTransferFnIsApproximatelyIdentity(const SkColorSpaceTransferFn& fn); |
| |
| // Approximates the |n| points in |x| and |t| by the transfer function |fn|. |
| // Returns true if the approximation converged. |
| bool COLOR_SPACE_EXPORT SkApproximateTransferFn(const float* x, |
| const float* t, |
| size_t n, |
| SkColorSpaceTransferFn* fn); |
| |
| // Approximates |sk_icc| by the transfer function |fn|. Returns in |max_error| |
| // the maximum pointwise of all color channels' transfer functions with |fn|. |
| // Returns false if no approximation was possible, or no approximation |
| // converged. |
| bool COLOR_SPACE_EXPORT SkApproximateTransferFn(sk_sp<SkICC> sk_icc, |
| float* max_error, |
| SkColorSpaceTransferFn* fn); |
| |
| bool COLOR_SPACE_EXPORT SkMatrixIsApproximatelyIdentity(const SkMatrix44& m); |
| |
| } // namespace gfx |
| |
| #endif // UI_GFX_SKIA_COLOR_SPACE_UTIL_H_ |