chromium/third_party/skia/include/effects/SkHighContrastFilter.h

/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/

#ifndef SkHighContrastFilter_DEFINED
#define SkHighContrastFilter_DEFINED

#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkTypes.h"

class SkColorFilter;

/**
 *  Configuration struct for SkHighContrastFilter.
 *
 *  Provides transformations to improve contrast for users with low vision.
 */
struct SkHighContrastConfig { … };

/**
 *  Color filter that provides transformations to improve contrast
 *  for users with low vision.
 *
 *  Applies the following transformations in this order. Each of these
 *  can be configured using SkHighContrastConfig.
 *
 *    - Conversion to grayscale
 *    - Color inversion (either in RGB or HSL space)
 *    - Increasing the resulting contrast.
 *
 * Calling SkHighContrastFilter::Make will return nullptr if the config is
 * not valid, e.g. if you try to call it with a contrast outside the range of
 * -1.0 to 1.0.
 */

struct SK_API SkHighContrastFilter { … };

#endif