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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 <jxl/butteraugli.h>
#include <jxl/parallel_runner.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <atomic>
#include "lib/jxl/base/data_parallel.h"
#include "lib/jxl/base/profiler.h"
#include "lib/jxl/butteraugli/butteraugli.h"
#include "lib/jxl/common.h"
#include "lib/jxl/enc_butteraugli_comparator.h"
#include "lib/jxl/enc_butteraugli_pnorm.h"
#include "lib/jxl/enc_color_management.h"
#include "lib/jxl/enc_external_image.h"
#include "lib/jxl/image_bundle.h"
#include "lib/jxl/memory_manager_internal.h"
namespace {
void SetMetadataFromPixelFormat(const JxlPixelFormat* pixel_format,
jxl::ImageMetadata* metadata) {
uint32_t potential_alpha_bits = 0;
switch (pixel_format->data_type) {
case JXL_TYPE_FLOAT:
metadata->SetFloat32Samples();
potential_alpha_bits = 16;
break;
case JXL_TYPE_FLOAT16:
metadata->SetFloat16Samples();
potential_alpha_bits = 16;
break;
case JXL_TYPE_UINT16:
metadata->SetUintSamples(16);
potential_alpha_bits = 16;
break;
case JXL_TYPE_UINT8:
metadata->SetUintSamples(8);
potential_alpha_bits = 8;
break;
default:
JXL_ABORT("Unhandled JxlDataType");
}
if (pixel_format->num_channels == 2 || pixel_format->num_channels == 4) {
metadata->SetAlphaBits(potential_alpha_bits);
}
}
} // namespace
struct JxlButteraugliResultStruct {
JxlMemoryManager memory_manager;
jxl::ImageF distmap;
jxl::ButteraugliParams params;
};
struct JxlButteraugliApiStruct {
// Multiplier for penalizing new HF artifacts more than blurring away
// features. 1.0=neutral.
float hf_asymmetry = 1.0f;
// Multiplier for the psychovisual difference in the X channel.
float xmul = 1.0f;
// Number of nits that correspond to 1.0f input values.
float intensity_target = jxl::kDefaultIntensityTarget;
JxlCmsInterface cms;
JxlMemoryManager memory_manager;
std::unique_ptr<jxl::ThreadPool> thread_pool{nullptr};
};
JxlButteraugliApi* JxlButteraugliApiCreate(
const JxlMemoryManager* memory_manager) {
JxlMemoryManager local_memory_manager;
if (!jxl::MemoryManagerInit(&local_memory_manager, memory_manager))
return nullptr;
void* alloc =
jxl::MemoryManagerAlloc(&local_memory_manager, sizeof(JxlButteraugliApi));
if (!alloc) return nullptr;
// Placement new constructor on allocated memory
JxlButteraugliApi* ret = new (alloc) JxlButteraugliApi();
ret->cms = jxl::GetJxlCms();
ret->memory_manager = local_memory_manager;
return ret;
}
void JxlButteraugliApiSetParallelRunner(JxlButteraugliApi* api,
JxlParallelRunner parallel_runner,
void* parallel_runner_opaque) {
api->thread_pool = jxl::make_unique<jxl::ThreadPool>(parallel_runner,
parallel_runner_opaque);
}
void JxlButteraugliApiSetHFAsymmetry(JxlButteraugliApi* api, float v) {
api->hf_asymmetry = v;
}
void JxlButteraugliApiSetIntensityTarget(JxlButteraugliApi* api, float v) {
api->intensity_target = v;
}
void JxlButteraugliApiDestroy(JxlButteraugliApi* api) {
if (api) {
JxlMemoryManager local_memory_manager = api->memory_manager;
// Call destructor directly since custom free function is used.
api->~JxlButteraugliApi();
jxl::MemoryManagerFree(&local_memory_manager, api);
}
}
JxlButteraugliResult* JxlButteraugliCompute(
const JxlButteraugliApi* api, uint32_t xsize, uint32_t ysize,
const JxlPixelFormat* pixel_format_orig, const void* buffer_orig,
size_t size_orig, const JxlPixelFormat* pixel_format_dist,
const void* buffer_dist, size_t size_dist) {
jxl::ImageMetadata orig_metadata;
SetMetadataFromPixelFormat(pixel_format_orig, &orig_metadata);
jxl::ImageBundle orig_ib(&orig_metadata);
jxl::ColorEncoding c_current;
if (pixel_format_orig->data_type == JXL_TYPE_FLOAT) {
c_current =
jxl::ColorEncoding::LinearSRGB(pixel_format_orig->num_channels < 3);
} else {
c_current = jxl::ColorEncoding::SRGB(pixel_format_orig->num_channels < 3);
}
if (!jxl::BufferToImageBundle(*pixel_format_orig, xsize, ysize, buffer_orig,
size_orig, api->thread_pool.get(), c_current,
&orig_ib)) {
return nullptr;
}
jxl::ImageMetadata dist_metadata;
SetMetadataFromPixelFormat(pixel_format_dist, &dist_metadata);
jxl::ImageBundle dist_ib(&dist_metadata);
if (pixel_format_dist->data_type == JXL_TYPE_FLOAT) {
c_current =
jxl::ColorEncoding::LinearSRGB(pixel_format_dist->num_channels < 3);
} else {
c_current = jxl::ColorEncoding::SRGB(pixel_format_dist->num_channels < 3);
}
if (!jxl::BufferToImageBundle(*pixel_format_dist, xsize, ysize, buffer_dist,
size_dist, api->thread_pool.get(), c_current,
&dist_ib)) {
return nullptr;
}
void* alloc = jxl::MemoryManagerAlloc(&api->memory_manager,
sizeof(JxlButteraugliResult));
if (!alloc) return nullptr;
// Placement new constructor on allocated memory
JxlButteraugliResult* result = new (alloc) JxlButteraugliResult();
result->memory_manager = api->memory_manager;
result->params.hf_asymmetry = api->hf_asymmetry;
result->params.xmul = api->xmul;
result->params.intensity_target = api->intensity_target;
jxl::ButteraugliDistance(orig_ib, dist_ib, result->params, api->cms,
&result->distmap, api->thread_pool.get());
return result;
}
float JxlButteraugliResultGetDistance(const JxlButteraugliResult* result,
float pnorm) {
return static_cast<float>(
jxl::ComputeDistanceP(result->distmap, result->params, pnorm));
}
void JxlButteraugliResultGetDistmap(const JxlButteraugliResult* result,
const float** buffer,
uint32_t* row_stride) {
*buffer = result->distmap.Row(0);
*row_stride = result->distmap.PixelsPerRow();
}
float JxlButteraugliResultGetMaxDistance(const JxlButteraugliResult* result) {
float max_distance = 0.0;
for (uint32_t y = 0; y < result->distmap.ysize(); y++) {
for (uint32_t x = 0; x < result->distmap.xsize(); x++) {
if (result->distmap.ConstRow(y)[x] > max_distance) {
max_distance = result->distmap.ConstRow(y)[x];
}
}
}
return max_distance;
}
void JxlButteraugliResultDestroy(JxlButteraugliResult* result) {
if (result) {
JxlMemoryManager local_memory_manager = result->memory_manager;
// Call destructor directly since custom free function is used.
result->~JxlButteraugliResult();
jxl::MemoryManagerFree(&local_memory_manager, result);
}
}
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