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/*
* Copyright 2023 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkGainmapShader_DEFINED
#define SkGainmapShader_DEFINED
#include "include/core/SkRefCnt.h"
class SkColorSpace;
class SkShader;
class SkImage;
struct SkGainmapInfo;
struct SkRect;
struct SkSamplingOptions;
/**
* A gainmap shader will apply a gainmap to an base image using the math described alongside the
* definition of SkGainmapInfo.
*/
class SK_API SkGainmapShader {
public:
/**
* Make a gainmap shader.
*
* When sampling the base image baseImage, the rectangle baseRect will be sampled to map to
* the rectangle dstRect. Sampling will be done according to baseSamplingOptions.
*
* When sampling the gainmap image gainmapImage, the rectangle gainmapRect will be sampled to
* map to the rectangle dstRect. Sampling will be done according to gainmapSamplingOptions.
*
* The gainmap will be applied according to the HDR to SDR ratio specified in dstHdrRatio.
*
* This shader must know the color space of the canvas that it will be rendered to. This color
* space must be specified in dstColorSpace.
* TODO(ccameron): Remove the need for dstColorSpace.
*/
static sk_sp<SkShader> Make(const sk_sp<const SkImage>& baseImage,
const SkRect& baseRect,
const SkSamplingOptions& baseSamplingOptions,
const sk_sp<const SkImage>& gainmapImage,
const SkRect& gainmapRect,
const SkSamplingOptions& gainmapSamplingOptions,
const SkGainmapInfo& gainmapInfo,
const SkRect& dstRect,
float dstHdrRatio,
sk_sp<SkColorSpace> dstColorSpace);
};
#endif
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