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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_from_linear.h"
#include "lib/jxl/base/status.h"
#undef HWY_TARGET_INCLUDE
#define HWY_TARGET_INCLUDE "lib/jxl/render_pipeline/stage_from_linear.cc"
#include <hwy/foreach_target.h>
#include <hwy/highway.h>
#include "lib/jxl/base/sanitizers.h"
#include "lib/jxl/cms/tone_mapping-inl.h"
#include "lib/jxl/cms/transfer_functions-inl.h"
#include "lib/jxl/common.h" // JXL_HIGH_PRECISION
HWY_BEFORE_NAMESPACE();
namespace jxl {
namespace HWY_NAMESPACE {
namespace {
// These templates are not found via ADL.
using hwy::HWY_NAMESPACE::IfThenZeroElse;
template <typename Op>
struct PerChannelOp {
explicit PerChannelOp(Op op) : op(op) {}
template <typename D, typename T>
void Transform(D d, T* r, T* g, T* b) const {
*r = op.Transform(d, *r);
*g = op.Transform(d, *g);
*b = op.Transform(d, *b);
}
Op op;
};
template <typename Op>
PerChannelOp<Op> MakePerChannelOp(Op&& op) {
return PerChannelOp<Op>(std::forward<Op>(op));
}
struct OpLinear {
template <typename D, typename T>
T Transform(D d, const T& linear) const {
return linear;
}
};
struct OpRgb {
template <typename D, typename T>
T Transform(D d, const T& linear) const {
#if JXL_HIGH_PRECISION
return TF_SRGB().EncodedFromDisplay(d, linear);
#else
return FastLinearToSRGB(d, linear);
#endif
}
};
struct OpPq {
explicit OpPq(const float intensity_target) : tf_pq_(intensity_target) {}
template <typename D, typename T>
T Transform(D d, const T& linear) const {
return tf_pq_.EncodedFromDisplay(d, linear);
}
TF_PQ tf_pq_;
};
struct OpHlg {
explicit OpHlg(const Vector3& luminances, const float intensity_target)
: hlg_ootf_(HlgOOTF::ToSceneLight(/*display_luminance=*/intensity_target,
luminances)) {}
template <typename D, typename T>
void Transform(D d, T* r, T* g, T* b) const {
hlg_ootf_.Apply(r, g, b);
*r = TF_HLG().EncodedFromDisplay(d, *r);
*g = TF_HLG().EncodedFromDisplay(d, *g);
*b = TF_HLG().EncodedFromDisplay(d, *b);
}
HlgOOTF hlg_ootf_;
};
struct Op709 {
template <typename D, typename T>
T Transform(D d, const T& linear) const {
return TF_709().EncodedFromDisplay(d, linear);
}
};
struct OpGamma {
const float inverse_gamma;
template <typename D, typename T>
T Transform(D d, const T& linear) const {
return IfThenZeroElse(Le(linear, Set(d, 1e-5f)),
FastPowf(d, linear, Set(d, inverse_gamma)));
}
};
template <typename Op>
class FromLinearStage : public RenderPipelineStage {
public:
explicit FromLinearStage(Op op)
: RenderPipelineStage(RenderPipelineStage::Settings()),
op_(std::move(op)) {}
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 {
const HWY_FULL(float) d;
const size_t xsize_v = RoundUpTo(xsize, Lanes(d));
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);
// All calculations are lane-wise, still some might require
// value-dependent behaviour (e.g. NearestInt). Temporary unpoison last
// vector tail.
msan::UnpoisonMemory(row0 + xsize, sizeof(float) * (xsize_v - xsize));
msan::UnpoisonMemory(row1 + xsize, sizeof(float) * (xsize_v - xsize));
msan::UnpoisonMemory(row2 + xsize, sizeof(float) * (xsize_v - xsize));
for (ssize_t x = -xextra; x < static_cast<ssize_t>(xsize + xextra);
x += Lanes(d)) {
auto r = LoadU(d, row0 + x);
auto g = LoadU(d, row1 + x);
auto b = LoadU(d, row2 + x);
op_.Transform(d, &r, &g, &b);
StoreU(r, d, row0 + x);
StoreU(g, d, row1 + x);
StoreU(b, d, row2 + x);
}
msan::PoisonMemory(row0 + xsize, sizeof(float) * (xsize_v - xsize));
msan::PoisonMemory(row1 + xsize, sizeof(float) * (xsize_v - xsize));
msan::PoisonMemory(row2 + xsize, sizeof(float) * (xsize_v - xsize));
return true;
}
RenderPipelineChannelMode GetChannelMode(size_t c) const final {
return c < 3 ? RenderPipelineChannelMode::kInPlace
: RenderPipelineChannelMode::kIgnored;
}
const char* GetName() const override { return "FromLinear"; }
private:
Op op_;
};
template <typename Op>
std::unique_ptr<FromLinearStage<Op>> MakeFromLinearStage(Op&& op) {
return jxl::make_unique<FromLinearStage<Op>>(std::forward<Op>(op));
}
std::unique_ptr<RenderPipelineStage> GetFromLinearStage(
const OutputEncodingInfo& output_encoding_info) {
const auto& tf = output_encoding_info.color_encoding.Tf();
if (tf.IsLinear()) {
return MakeFromLinearStage(MakePerChannelOp(OpLinear()));
} else if (tf.IsSRGB()) {
return MakeFromLinearStage(MakePerChannelOp(OpRgb()));
} else if (tf.IsPQ()) {
return MakeFromLinearStage(
MakePerChannelOp(OpPq(output_encoding_info.orig_intensity_target)));
} else if (tf.IsHLG()) {
return MakeFromLinearStage(
OpHlg(output_encoding_info.luminances,
output_encoding_info.desired_intensity_target));
} else if (tf.Is709()) {
return MakeFromLinearStage(MakePerChannelOp(Op709()));
} else if (tf.have_gamma || tf.IsDCI()) {
return MakeFromLinearStage(
MakePerChannelOp(OpGamma{output_encoding_info.inverse_gamma}));
} else {
// This is a programming error.
JXL_DEBUG_ABORT("Invalid target encoding");
return nullptr;
}
}
} // namespace
// NOLINTNEXTLINE(google-readability-namespace-comments)
} // namespace HWY_NAMESPACE
} // namespace jxl
HWY_AFTER_NAMESPACE();
#if HWY_ONCE
namespace jxl {
HWY_EXPORT(GetFromLinearStage);
std::unique_ptr<RenderPipelineStage> GetFromLinearStage(
const OutputEncodingInfo& output_encoding_info) {
return HWY_DYNAMIC_DISPATCH(GetFromLinearStage)(output_encoding_info);
}
} // namespace jxl
#endif