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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/dec/decode.h"
#include <locale>
#if JPEGXL_ENABLE_APNG
#include "lib/extras/dec/apng.h"
#endif
#if JPEGXL_ENABLE_EXR
#include "lib/extras/dec/exr.h"
#endif
#if JPEGXL_ENABLE_GIF
#include "lib/extras/dec/gif.h"
#endif
#if JPEGXL_ENABLE_JPEG
#include "lib/extras/dec/jpg.h"
#endif
#include "lib/extras/dec/pgx.h"
#include "lib/extras/dec/pnm.h"
namespace jxl {
namespace extras {
namespace {
// Any valid encoding is larger (ensures codecs can read the first few bytes)
constexpr size_t kMinBytes = 9;
} // namespace
std::vector<Codec> AvailableCodecs() {
std::vector<Codec> out;
#if JPEGXL_ENABLE_APNG
out.push_back(Codec::kPNG);
#endif
#if JPEGXL_ENABLE_EXR
out.push_back(Codec::kEXR);
#endif
#if JPEGXL_ENABLE_GIF
out.push_back(Codec::kGIF);
#endif
#if JPEGXL_ENABLE_JPEG
out.push_back(Codec::kJPG);
#endif
out.push_back(Codec::kPGX);
out.push_back(Codec::kPNM);
return out;
}
Codec CodecFromExtension(std::string extension,
size_t* JXL_RESTRICT bits_per_sample) {
std::transform(
extension.begin(), extension.end(), extension.begin(),
[](char c) { return std::tolower(c, std::locale::classic()); });
if (extension == ".png") return Codec::kPNG;
if (extension == ".jpg") return Codec::kJPG;
if (extension == ".jpeg") return Codec::kJPG;
if (extension == ".pgx") return Codec::kPGX;
if (extension == ".pam") return Codec::kPNM;
if (extension == ".pnm") return Codec::kPNM;
if (extension == ".pgm") return Codec::kPNM;
if (extension == ".ppm") return Codec::kPNM;
if (extension == ".pfm") {
if (bits_per_sample != nullptr) *bits_per_sample = 32;
return Codec::kPNM;
}
if (extension == ".gif") return Codec::kGIF;
if (extension == ".exr") return Codec::kEXR;
return Codec::kUnknown;
}
Status DecodeBytes(const Span<const uint8_t> bytes,
const ColorHints& color_hints, extras::PackedPixelFile* ppf,
const SizeConstraints* constraints, Codec* orig_codec) {
if (bytes.size() < kMinBytes) return JXL_FAILURE("Too few bytes");
*ppf = extras::PackedPixelFile();
// Default values when not set by decoders.
ppf->info.uses_original_profile = true;
ppf->info.orientation = JXL_ORIENT_IDENTITY;
const auto choose_codec = [&]() -> Codec {
#if JPEGXL_ENABLE_APNG
if (DecodeImageAPNG(bytes, color_hints, ppf, constraints)) {
return Codec::kPNG;
}
#endif
if (DecodeImagePGX(bytes, color_hints, ppf, constraints)) {
return Codec::kPGX;
}
if (DecodeImagePNM(bytes, color_hints, ppf, constraints)) {
return Codec::kPNM;
}
#if JPEGXL_ENABLE_GIF
if (DecodeImageGIF(bytes, color_hints, ppf, constraints)) {
return Codec::kGIF;
}
#endif
#if JPEGXL_ENABLE_JPEG
if (DecodeImageJPG(bytes, color_hints, ppf, constraints)) {
return Codec::kJPG;
}
#endif
#if JPEGXL_ENABLE_EXR
if (DecodeImageEXR(bytes, color_hints, ppf, constraints)) {
return Codec::kEXR;
}
#endif
return Codec::kUnknown;
};
Codec codec = choose_codec();
if (codec == Codec::kUnknown) {
return JXL_FAILURE("Codecs failed to decode");
}
if (orig_codec) *orig_codec = codec;
return true;
}
} // namespace extras
} // namespace jxl
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