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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/extras/enc/jpg.h"
#include <jpeglib.h>
#include <setjmp.h>
#include <stdint.h>
#include <algorithm>
#include <iterator>
#include <numeric>
#include <utility>
#include <vector>
#include "lib/jxl/base/compiler_specific.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/color_encoding_internal.h"
#include "lib/jxl/common.h"
#include "lib/jxl/dec_external_image.h"
#include "lib/jxl/enc_color_management.h"
#include "lib/jxl/enc_image_bundle.h"
#include "lib/jxl/exif.h"
#include "lib/jxl/image.h"
#include "lib/jxl/image_bundle.h"
#include "lib/jxl/sanitizers.h"
#if JPEGXL_ENABLE_SJPEG
#include "sjpeg.h"
#endif
namespace jxl {
namespace extras {
namespace {
constexpr unsigned char kICCSignature[12] = {
0x49, 0x43, 0x43, 0x5F, 0x50, 0x52, 0x4F, 0x46, 0x49, 0x4C, 0x45, 0x00};
constexpr int kICCMarker = JPEG_APP0 + 2;
constexpr size_t kMaxBytesInMarker = 65533;
constexpr unsigned char kExifSignature[6] = {0x45, 0x78, 0x69,
0x66, 0x00, 0x00};
constexpr int kExifMarker = JPEG_APP0 + 1;
void WriteICCProfile(jpeg_compress_struct* const cinfo,
const PaddedBytes& icc) {
constexpr size_t kMaxIccBytesInMarker =
kMaxBytesInMarker - sizeof kICCSignature - 2;
const int num_markers =
static_cast<int>(DivCeil(icc.size(), kMaxIccBytesInMarker));
size_t begin = 0;
for (int current_marker = 0; current_marker < num_markers; ++current_marker) {
const size_t length = std::min(kMaxIccBytesInMarker, icc.size() - begin);
jpeg_write_m_header(
cinfo, kICCMarker,
static_cast<unsigned int>(length + sizeof kICCSignature + 2));
for (const unsigned char c : kICCSignature) {
jpeg_write_m_byte(cinfo, c);
}
jpeg_write_m_byte(cinfo, current_marker + 1);
jpeg_write_m_byte(cinfo, num_markers);
for (size_t i = 0; i < length; ++i) {
jpeg_write_m_byte(cinfo, icc[begin]);
++begin;
}
}
}
void WriteExif(jpeg_compress_struct* const cinfo,
const std::vector<uint8_t>& exif) {
jpeg_write_m_header(
cinfo, kExifMarker,
static_cast<unsigned int>(exif.size() + sizeof kExifSignature));
for (const unsigned char c : kExifSignature) {
jpeg_write_m_byte(cinfo, c);
}
for (size_t i = 0; i < exif.size(); ++i) {
jpeg_write_m_byte(cinfo, exif[i]);
}
}
Status SetChromaSubsampling(const YCbCrChromaSubsampling& chroma_subsampling,
jpeg_compress_struct* const cinfo) {
for (size_t i = 0; i < 3; i++) {
cinfo->comp_info[i].h_samp_factor =
1 << (chroma_subsampling.MaxHShift() -
chroma_subsampling.HShift(i < 2 ? i ^ 1 : i));
cinfo->comp_info[i].v_samp_factor =
1 << (chroma_subsampling.MaxVShift() -
chroma_subsampling.VShift(i < 2 ? i ^ 1 : i));
}
return true;
}
} // namespace
Status EncodeWithLibJpeg(const ImageBundle* ib, const CodecInOut* io,
size_t quality,
const YCbCrChromaSubsampling& chroma_subsampling,
PaddedBytes* bytes) {
jpeg_compress_struct cinfo;
// cinfo is initialized by libjpeg, which we are not instrumenting with
// msan.
msan::UnpoisonMemory(&cinfo, sizeof(cinfo));
jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
unsigned char* buffer = nullptr;
unsigned long size = 0;
jpeg_mem_dest(&cinfo, &buffer, &size);
cinfo.image_width = ib->oriented_xsize();
cinfo.image_height = ib->oriented_ysize();
if (ib->IsGray()) {
cinfo.input_components = 1;
cinfo.in_color_space = JCS_GRAYSCALE;
} else {
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
}
jpeg_set_defaults(&cinfo);
cinfo.optimize_coding = TRUE;
if (cinfo.input_components == 3) {
JXL_RETURN_IF_ERROR(SetChromaSubsampling(chroma_subsampling, &cinfo));
}
jpeg_set_quality(&cinfo, quality, TRUE);
jpeg_start_compress(&cinfo, TRUE);
if (!ib->IsSRGB()) {
WriteICCProfile(&cinfo, ib->c_current().ICC());
}
if (!io->blobs.exif.empty()) {
std::vector<uint8_t> exif = io->blobs.exif;
ResetExifOrientation(exif);
WriteExif(&cinfo, exif);
}
if (cinfo.input_components > 3 || cinfo.input_components < 0)
return JXL_FAILURE("invalid numbers of components");
size_t stride =
ib->oriented_xsize() * cinfo.input_components * sizeof(JSAMPLE);
PaddedBytes raw_bytes(stride * ib->oriented_ysize());
JXL_RETURN_IF_ERROR(ConvertToExternal(
*ib, BITS_IN_JSAMPLE, /*float_out=*/false, cinfo.input_components,
JXL_BIG_ENDIAN, stride, nullptr, raw_bytes.data(), raw_bytes.size(),
/*out_callback=*/{}, ib->metadata()->GetOrientation()));
for (size_t y = 0; y < ib->oriented_ysize(); ++y) {
JSAMPROW row[] = {raw_bytes.data() + y * stride};
jpeg_write_scanlines(&cinfo, row, 1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
bytes->resize(size);
// Compressed image data is initialized by libjpeg, which we are not
// instrumenting with msan.
msan::UnpoisonMemory(buffer, size);
std::copy_n(buffer, size, bytes->data());
std::free(buffer);
return true;
}
Status EncodeWithSJpeg(const ImageBundle* ib, const CodecInOut* io,
size_t quality,
const YCbCrChromaSubsampling& chroma_subsampling,
PaddedBytes* bytes) {
#if !JPEGXL_ENABLE_SJPEG
return JXL_FAILURE("JPEG XL was built without sjpeg support");
#else
sjpeg::EncoderParam param(quality);
if (!ib->IsSRGB()) {
param.iccp.assign(ib->metadata()->color_encoding.ICC().begin(),
ib->metadata()->color_encoding.ICC().end());
}
std::vector<uint8_t> exif = io->blobs.exif;
if (!exif.empty()) {
ResetExifOrientation(exif);
param.exif.assign(exif.begin(), exif.end());
}
if (chroma_subsampling.Is444()) {
param.yuv_mode = SJPEG_YUV_444;
} else if (chroma_subsampling.Is420()) {
param.yuv_mode = SJPEG_YUV_SHARP;
} else {
return JXL_FAILURE("sjpeg does not support this chroma subsampling mode");
}
size_t stride = ib->oriented_xsize() * 3;
PaddedBytes rgb(ib->xsize() * ib->ysize() * 3);
JXL_RETURN_IF_ERROR(
ConvertToExternal(*ib, 8, /*float_out=*/false, 3, JXL_BIG_ENDIAN, stride,
nullptr, rgb.data(), rgb.size(),
/*out_callback=*/{}, ib->metadata()->GetOrientation()));
std::string output;
JXL_RETURN_IF_ERROR(sjpeg::Encode(rgb.data(), ib->oriented_xsize(),
ib->oriented_ysize(), stride, param,
&output));
bytes->assign(
reinterpret_cast<const uint8_t*>(output.data()),
reinterpret_cast<const uint8_t*>(output.data() + output.size()));
return true;
#endif
}
Status EncodeImageJPG(const CodecInOut* io, JpegEncoder encoder, size_t quality,
YCbCrChromaSubsampling chroma_subsampling,
ThreadPool* pool, PaddedBytes* bytes) {
if (io->Main().HasAlpha()) {
return JXL_FAILURE("alpha is not supported");
}
if (quality > 100) {
return JXL_FAILURE("please specify a 0-100 JPEG quality");
}
const ImageBundle* ib;
ImageMetadata metadata = io->metadata.m;
ImageBundle ib_store(&metadata);
JXL_RETURN_IF_ERROR(TransformIfNeeded(io->Main(),
io->metadata.m.color_encoding,
GetJxlCms(), pool, &ib_store, &ib));
switch (encoder) {
case JpegEncoder::kLibJpeg:
JXL_RETURN_IF_ERROR(
EncodeWithLibJpeg(ib, io, quality, chroma_subsampling, bytes));
break;
case JpegEncoder::kSJpeg:
JXL_RETURN_IF_ERROR(
EncodeWithSJpeg(ib, io, quality, chroma_subsampling, bytes));
break;
default:
return JXL_FAILURE("tried to use an unknown JPEG encoder");
}
return true;
}
} // namespace extras
} // namespace jxl
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