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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.
#ifndef LIB_JXL_ENC_COMPARATOR_H_
#define LIB_JXL_ENC_COMPARATOR_H_
#include "lib/jxl/base/data_parallel.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/image.h"
#include "lib/jxl/image_bundle.h"
namespace jxl {
class Comparator {
public:
virtual ~Comparator() = default;
// Sets the reference image, the first to compare
// Image must be in linear sRGB (gamma expanded) in range 0.0f-1.0f as
// the range from standard black point to standard white point, but values
// outside permitted.
virtual Status SetReferenceImage(const ImageBundle& ref) = 0;
// Sets the actual image (with loss), the second to compare
// Image must be in linear sRGB (gamma expanded) in range 0.0f-1.0f as
// the range from standard black point to standard white point, but values
// outside permitted.
// In diffmap it outputs the local score per pixel, while in score it outputs
// a single score. Any one may be set to nullptr to not compute it.
virtual Status CompareWith(const ImageBundle& actual, ImageF* diffmap,
float* score) = 0;
// Quality thresholds for diffmap and score values.
// The good score must represent a value where the images are considered to
// be perceptually indistinguishable (but not identical)
// The bad value must be larger than good to indicate "lower means better"
// and smaller than good to indicate "higher means better"
virtual float GoodQualityScore() const = 0;
virtual float BadQualityScore() const = 0;
};
// Computes the score given images in any RGB color model, optionally with
// alpha channel.
float ComputeScore(const ImageBundle& rgb0, const ImageBundle& rgb1,
Comparator* comparator, const JxlCmsInterface& cms,
ImageF* diffmap = nullptr, ThreadPool* pool = nullptr);
} // namespace jxl
#endif // LIB_JXL_ENC_COMPARATOR_H_
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