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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_spot.h"
namespace jxl {
class SpotColorStage : public RenderPipelineStage {
public:
explicit SpotColorStage(size_t spot_c, const float* spot_color)
: RenderPipelineStage(RenderPipelineStage::Settings()),
spot_c_(spot_c),
spot_color_(spot_color) {
JXL_ASSERT(spot_c_ >= 3);
}
void 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 {
// TODO(veluca): add SIMD.
PROFILER_ZONE("RenderSpotColors");
float scale = spot_color_[3];
for (size_t c = 0; c < 3; c++) {
float* JXL_RESTRICT p = GetInputRow(input_rows, c, 0);
const float* JXL_RESTRICT s = GetInputRow(input_rows, spot_c_, 0);
for (ssize_t x = -xextra; x < ssize_t(xsize + xextra); x++) {
float mix = scale * s[x];
p[x] = mix * spot_color_[c] + (1.0f - mix) * p[x];
}
}
}
RenderPipelineChannelMode GetChannelMode(size_t c) const final {
return c < 3 ? RenderPipelineChannelMode::kInPlace
: c == spot_c_ ? RenderPipelineChannelMode::kInput
: RenderPipelineChannelMode::kIgnored;
}
const char* GetName() const override { return "Spot"; }
private:
size_t spot_c_;
const float* spot_color_;
};
std::unique_ptr<RenderPipelineStage> GetSpotColorStage(
size_t spot_c, const float* spot_color) {
return jxl::make_unique<SpotColorStage>(spot_c, spot_color);
}
} // namespace jxl
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