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