stage_tone_mapping.h

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// Copyright (c) the JPEG XL Project 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 LIB_JXL_RENDER_PIPELINE_STAGE_TONE_MAPPING_H_

#define LIB_JXL_RENDER_PIPELINE_STAGE_TONE_MAPPING_H_

#include <math.h>

#include <stdint.h>

#include <algorithm>

#include <utility>

#include <vector>

#include "lib/jxl/dec_xyb.h"

#include "lib/jxl/render_pipeline/render_pipeline_stage.h"

namespace jxl {

// Tone maps the image if appropriate. It must be in linear space and

// `output_encoding_info.luminances` must contain the luminance for the

// primaries of that space. It must also be encoded such that (1, 1, 1)

// represents `output_encoding_info.orig_intensity_target` nits, unless

// `output_encoding_info.color_encoding.tf.IsPQ()`, in which case (1, 1, 1) must

// represent 10000 nits. This corresponds to what XYBStage outputs. After this

// stage, (1, 1, 1) will represent

// `output_encoding_info.desired_intensity_target` nits, except in the PQ

// special case in which it remains 10000.

//

// If no tone mapping is necessary, this will return nullptr.

std::unique_ptr<RenderPipelineStage> GetToneMappingStage(

    const OutputEncodingInfo& output_encoding_info);

}  // namespace jxl

#endif  // LIB_JXL_RENDER_PIPELINE_STAGE_TONE_MAPPING_H_