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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.
#include "lib/jxl/render_pipeline/stage_cms.h"
#include <memory>
#include "lib/jxl/base/status.h"
#include "lib/jxl/color_encoding_internal.h"
#include "lib/jxl/dec_xyb.h"
#undef HWY_TARGET_INCLUDE
#define HWY_TARGET_INCLUDE "lib/jxl/render_pipeline/stage_cms.cc"
#include <hwy/foreach_target.h>
#include <hwy/highway.h>
#include "lib/jxl/dec_xyb-inl.h"
HWY_BEFORE_NAMESPACE();
namespace jxl {
namespace HWY_NAMESPACE {
class CmsStage : public RenderPipelineStage {
public:
explicit CmsStage(OutputEncodingInfo output_encoding_info)
: RenderPipelineStage(RenderPipelineStage::Settings()),
output_encoding_info_(std::move(output_encoding_info)) {
c_src_ = output_encoding_info_.linear_color_encoding;
}
bool IsNeeded() const {
const size_t channels_src = (c_src_.IsCMYK() ? 4 : c_src_.Channels());
const size_t channels_dst = output_encoding_info_.color_encoding.Channels();
const bool not_mixing_color_and_grey =
(channels_src == channels_dst ||
(channels_src == 4 && channels_dst == 3));
return (output_encoding_info_.cms_set) &&
!c_src_.SameColorEncoding(output_encoding_info_.color_encoding) &&
not_mixing_color_and_grey;
}
Status ProcessRow(const RowInfo& input_rows, const RowInfo& output_rows,
size_t xextra, size_t xsize, size_t xpos, size_t ypos,
size_t thread_id) const final {
JXL_ENSURE(xsize <= xsize_);
// TODO(firsching): handle grey case separately
// interleave
float* JXL_RESTRICT row0 = GetInputRow(input_rows, 0, 0);
float* JXL_RESTRICT row1 = GetInputRow(input_rows, 1, 0);
float* JXL_RESTRICT row2 = GetInputRow(input_rows, 2, 0);
float* mutable_buf_src = color_space_transform->BufSrc(thread_id);
for (size_t x = 0; x < xsize; x++) {
mutable_buf_src[3 * x + 0] = row0[x];
mutable_buf_src[3 * x + 1] = row1[x];
mutable_buf_src[3 * x + 2] = row2[x];
}
const float* buf_src = mutable_buf_src;
float* JXL_RESTRICT buf_dst = color_space_transform->BufDst(thread_id);
JXL_RETURN_IF_ERROR(
color_space_transform->Run(thread_id, buf_src, buf_dst, xsize));
// de-interleave
for (size_t x = 0; x < xsize; x++) {
row0[x] = buf_dst[3 * x + 0];
row1[x] = buf_dst[3 * x + 1];
row2[x] = buf_dst[3 * x + 2];
}
return true;
}
RenderPipelineChannelMode GetChannelMode(size_t c) const final {
return c < 3 ? RenderPipelineChannelMode::kInPlace
: RenderPipelineChannelMode::kIgnored;
}
const char* GetName() const override { return "Cms"; }
private:
OutputEncodingInfo output_encoding_info_;
size_t xsize_;
std::unique_ptr<jxl::ColorSpaceTransform> color_space_transform;
ColorEncoding c_src_;
Status SetInputSizes(
const std::vector<std::pair<size_t, size_t>>& input_sizes) override {
JXL_ENSURE(input_sizes.size() >= 3);
for (size_t c = 1; c < input_sizes.size(); c++) {
JXL_ENSURE(input_sizes[c].first == input_sizes[0].first);
JXL_ENSURE(input_sizes[c].second == input_sizes[0].second);
}
xsize_ = input_sizes[0].first;
return true;
}
Status PrepareForThreads(size_t num_threads) override {
color_space_transform = jxl::make_unique<jxl::ColorSpaceTransform>(
output_encoding_info_.color_management_system);
JXL_RETURN_IF_ERROR(color_space_transform->Init(
c_src_, output_encoding_info_.color_encoding,
output_encoding_info_.desired_intensity_target, xsize_, num_threads));
return true;
}
};
std::unique_ptr<RenderPipelineStage> GetCmsStage(
const OutputEncodingInfo& output_encoding_info) {
auto stage = jxl::make_unique<CmsStage>(output_encoding_info);
if (!stage->IsNeeded()) return nullptr;
return stage;
}
// NOLINTNEXTLINE(google-readability-namespace-comments)
} // namespace HWY_NAMESPACE
} // namespace jxl
HWY_AFTER_NAMESPACE();
#if HWY_ONCE
namespace jxl {
HWY_EXPORT(GetCmsStage);
std::unique_ptr<RenderPipelineStage> GetCmsStage(
const OutputEncodingInfo& output_encoding_info) {
return HWY_DYNAMIC_DISPATCH(GetCmsStage)(output_encoding_info);
}
} // namespace jxl
#endif