54 lines
2 KiB
C++
54 lines
2 KiB
C++
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#ifndef LIB_JXL_ENC_XYB_H_
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#define LIB_JXL_ENC_XYB_H_
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// Converts to XYB color space.
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#include <jxl/cms_interface.h>
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#include <cstddef>
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#include "lib/jxl/base/compiler_specific.h"
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#include "lib/jxl/base/data_parallel.h"
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#include "lib/jxl/base/status.h"
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#include "lib/jxl/color_encoding_internal.h"
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#include "lib/jxl/image.h"
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#include "lib/jxl/image_bundle.h"
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namespace jxl {
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// Converts any color space to XYB in-place. If `linear` is not null, fills it
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// with a linear sRGB copy of `image`.
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Status ToXYB(const ColorEncoding& c_current, float intensity_target,
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const ImageF* black, ThreadPool* pool, Image3F* JXL_RESTRICT image,
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const JxlCmsInterface& cms, Image3F* JXL_RESTRICT linear);
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Status ToXYB(const ImageBundle& in, ThreadPool* pool, Image3F* JXL_RESTRICT xyb,
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const JxlCmsInterface& cms,
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Image3F* JXL_RESTRICT linear = nullptr);
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void LinearRGBRowToXYB(float* JXL_RESTRICT row0, float* JXL_RESTRICT row1,
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float* JXL_RESTRICT row2,
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const float* JXL_RESTRICT premul_absorb, size_t xsize);
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void ComputePremulAbsorb(float intensity_target, float* premul_absorb);
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// Transforms each color component of the given XYB image into the [0.0, 1.0]
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// interval with an affine transform.
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void ScaleXYB(Image3F* opsin);
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void ScaleXYBRow(float* row0, float* row1, float* row2, size_t xsize);
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// Bt.601 to match JPEG/JFIF. Outputs _signed_ YCbCr values suitable for DCT,
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// see F.1.1.3 of T.81 (because our data type is float, there is no need to add
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// a bias to make the values unsigned).
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Status RgbToYcbcr(const ImageF& r_plane, const ImageF& g_plane,
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const ImageF& b_plane, ImageF* y_plane, ImageF* cb_plane,
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ImageF* cr_plane, ThreadPool* pool);
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} // namespace jxl
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#endif // LIB_JXL_ENC_XYB_H_
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