enc_xyb.h - mozsearch

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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_ENC_XYB_H_

#define LIB_JXL_ENC_XYB_H_

// Converts to XYB color space.

#include <jxl/cms_interface.h>

#include <cstddef>

#include "lib/jxl/base/compiler_specific.h"

#include "lib/jxl/base/data_parallel.h"

#include "lib/jxl/base/status.h"

#include "lib/jxl/color_encoding_internal.h"

#include "lib/jxl/image.h"

#include "lib/jxl/image_bundle.h"

namespace jxl {

// Converts any color space to XYB in-place. If `linear` is not null, fills it

// with a linear sRGB copy of `image`.

Status ToXYB(const ColorEncoding& c_current, float intensity_target,

             const ImageF* black, ThreadPool* pool, Image3F* JXL_RESTRICT image,

             const JxlCmsInterface& cms, Image3F* JXL_RESTRICT linear);

Status ToXYB(const ImageBundle& in, ThreadPool* pool, Image3F* JXL_RESTRICT xyb,

             const JxlCmsInterface& cms,

             Image3F* JXL_RESTRICT linear = nullptr);

void LinearRGBRowToXYB(float* JXL_RESTRICT row0, float* JXL_RESTRICT row1,

                       float* JXL_RESTRICT row2,

                       const float* JXL_RESTRICT premul_absorb, size_t xsize);

void ComputePremulAbsorb(float intensity_target, float* premul_absorb);

// Transforms each color component of the given XYB image into the [0.0, 1.0]

// interval with an affine transform.

void ScaleXYB(Image3F* opsin);

void ScaleXYBRow(float* row0, float* row1, float* row2, size_t xsize);

// Bt.601 to match JPEG/JFIF. Outputs _signed_ YCbCr values suitable for DCT,

// see F.1.1.3 of T.81 (because our data type is float, there is no need to add

// a bias to make the values unsigned).

Status RgbToYcbcr(const ImageF& r_plane, const ImageF& g_plane,

                  const ImageF& b_plane, ImageF* y_plane, ImageF* cb_plane,

                  ImageF* cr_plane, ThreadPool* pool);

}  // namespace jxl

#endif  // LIB_JXL_ENC_XYB_H_