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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/enc_butteraugli_comparator.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/enc_image_bundle.h"
namespace jxl {
JxlButteraugliComparator::JxlButteraugliComparator(
const ButteraugliParams& params, const JxlCmsInterface& cms)
: params_(params), cms_(cms) {}
Status JxlButteraugliComparator::SetReferenceImage(const ImageBundle& ref) {
const ImageBundle* ref_linear_srgb;
ImageMetadata metadata = *ref.metadata();
ImageBundle store(&metadata);
if (!TransformIfNeeded(ref, ColorEncoding::LinearSRGB(ref.IsGray()), cms_,
/*pool=*/nullptr, &store, &ref_linear_srgb)) {
return false;
}
JXL_ASSIGN_OR_RETURN(comparator_, ButteraugliComparator::Make(
ref_linear_srgb->color(), params_));
xsize_ = ref.xsize();
ysize_ = ref.ysize();
return true;
}
Status JxlButteraugliComparator::SetLinearReferenceImage(
const Image3F& linear) {
JXL_ASSIGN_OR_RETURN(comparator_,
ButteraugliComparator::Make(linear, params_));
xsize_ = linear.xsize();
ysize_ = linear.ysize();
return true;
}
Status JxlButteraugliComparator::CompareWith(const ImageBundle& actual,
ImageF* diffmap, float* score) {
if (!comparator_) {
return JXL_FAILURE("Must set reference image first");
}
if (xsize_ != actual.xsize() || ysize_ != actual.ysize()) {
return JXL_FAILURE("Images must have same size");
}
const ImageBundle* actual_linear_srgb;
ImageMetadata metadata = *actual.metadata();
ImageBundle store(&metadata);
if (!TransformIfNeeded(actual, ColorEncoding::LinearSRGB(actual.IsGray()),
cms_,
/*pool=*/nullptr, &store, &actual_linear_srgb)) {
return false;
}
JXL_ASSIGN_OR_RETURN(ImageF temp_diffmap, ImageF::Create(xsize_, ysize_));
JXL_RETURN_IF_ERROR(
comparator_->Diffmap(actual_linear_srgb->color(), temp_diffmap));
if (score != nullptr) {
*score = ButteraugliScoreFromDiffmap(temp_diffmap, ¶ms_);
}
if (diffmap != nullptr) {
diffmap->Swap(temp_diffmap);
}
return true;
}
float JxlButteraugliComparator::GoodQualityScore() const {
return ButteraugliFuzzyInverse(1.5);
}
float JxlButteraugliComparator::BadQualityScore() const {
return ButteraugliFuzzyInverse(0.5);
}
} // namespace jxl
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