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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/encode.h"
#include <locale>
#include "lib/extras/enc/apng.h"
#include "lib/extras/enc/exr.h"
#include "lib/extras/enc/jpg.h"
#include "lib/extras/enc/npy.h"
#include "lib/extras/enc/pgx.h"
#include "lib/extras/enc/pnm.h"
namespace jxl {
namespace extras {
Status Encoder::VerifyBasicInfo(const JxlBasicInfo& info) {
if (info.xsize == 0 || info.ysize == 0) {
return JXL_FAILURE("Empty image");
}
if (info.num_color_channels != 1 && info.num_color_channels != 3) {
return JXL_FAILURE("Invalid number of color channels");
}
if (info.alpha_bits > 0 && info.alpha_bits != info.bits_per_sample) {
return JXL_FAILURE("Alpha bit depth does not match image bit depth");
}
if (info.orientation != JXL_ORIENT_IDENTITY) {
return JXL_FAILURE("Orientation must be identity");
}
return true;
}
Status Encoder::VerifyFormat(const JxlPixelFormat& format) const {
for (auto f : AcceptedFormats()) {
if (f.num_channels != format.num_channels) continue;
if (f.data_type != format.data_type) continue;
if (f.data_type == JXL_TYPE_UINT8 || f.endianness == format.endianness) {
return true;
}
}
return JXL_FAILURE("Format is not in the list of accepted formats.");
}
Status Encoder::VerifyBitDepth(JxlDataType data_type, uint32_t bits_per_sample,
uint32_t exponent_bits) {
if ((data_type == JXL_TYPE_UINT8 &&
(bits_per_sample == 0 || bits_per_sample > 8 || exponent_bits != 0)) ||
(data_type == JXL_TYPE_UINT16 &&
(bits_per_sample <= 8 || bits_per_sample > 16 || exponent_bits != 0)) ||
(data_type == JXL_TYPE_FLOAT16 &&
(bits_per_sample > 16 || exponent_bits > 5))) {
return JXL_FAILURE(
"Incompatible data_type %d and bit depth %u with exponent bits %u",
static_cast<int>(data_type), bits_per_sample, exponent_bits);
}
return true;
}
Status Encoder::VerifyImageSize(const PackedImage& image,
const JxlBasicInfo& info) {
if (image.pixels() == nullptr) {
return JXL_FAILURE("Invalid image.");
}
if (image.stride != image.xsize * image.pixel_stride()) {
return JXL_FAILURE("Invalid image stride.");
}
if (image.pixels_size != image.ysize * image.stride) {
return JXL_FAILURE("Invalid image size.");
}
size_t info_num_channels =
(info.num_color_channels + (info.alpha_bits > 0 ? 1 : 0));
if (image.xsize != info.xsize || image.ysize != info.ysize ||
image.format.num_channels != info_num_channels) {
return JXL_FAILURE("Frame size does not match image size");
}
return true;
}
Status Encoder::VerifyPackedImage(const PackedImage& image,
const JxlBasicInfo& info) const {
JXL_RETURN_IF_ERROR(VerifyImageSize(image, info));
JXL_RETURN_IF_ERROR(VerifyFormat(image.format));
JXL_RETURN_IF_ERROR(VerifyBitDepth(image.format.data_type,
info.bits_per_sample,
info.exponent_bits_per_sample));
return true;
}
template <int metadata>
class MetadataEncoder : public Encoder {
public:
std::vector<JxlPixelFormat> AcceptedFormats() const override {
std::vector<JxlPixelFormat> formats;
// empty, i.e. no need for actual pixel data
return formats;
}
Status Encode(const PackedPixelFile& ppf, EncodedImage* encoded,
ThreadPool* pool) const override {
JXL_RETURN_IF_ERROR(VerifyBasicInfo(ppf.info));
encoded->icc.clear();
encoded->bitstreams.resize(1);
if (metadata == 0) encoded->bitstreams.front() = ppf.metadata.exif;
if (metadata == 1) encoded->bitstreams.front() = ppf.metadata.xmp;
if (metadata == 2) encoded->bitstreams.front() = ppf.metadata.jumbf;
return true;
}
};
std::unique_ptr<Encoder> Encoder::FromExtension(std::string extension) {
std::transform(
extension.begin(), extension.end(), extension.begin(),
[](char c) { return std::tolower(c, std::locale::classic()); });
if (extension == ".png" || extension == ".apng") return GetAPNGEncoder();
if (extension == ".jpg") return GetJPEGEncoder();
if (extension == ".jpeg") return GetJPEGEncoder();
if (extension == ".npy") return GetNumPyEncoder();
if (extension == ".pgx") return GetPGXEncoder();
if (extension == ".pam") return GetPAMEncoder();
if (extension == ".pgm") return GetPGMEncoder();
if (extension == ".ppm") return GetPPMEncoder();
if (extension == ".pnm") return GetPNMEncoder();
if (extension == ".pfm") return GetPFMEncoder();
if (extension == ".exr") return GetEXREncoder();
if (extension == ".exif") return jxl::make_unique<MetadataEncoder<0>>();
if (extension == ".xmp") return jxl::make_unique<MetadataEncoder<1>>();
if (extension == ".xml") return jxl::make_unique<MetadataEncoder<1>>();
if (extension == ".jumbf") return jxl::make_unique<MetadataEncoder<2>>();
if (extension == ".jumb") return jxl::make_unique<MetadataEncoder<2>>();
return nullptr;
}
} // namespace extras
} // namespace jxl
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