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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/codec.h"
#include <jxl/decode.h>
#include <jxl/types.h>
#include "lib/extras/packed_image.h"
#include "lib/jxl/base/padded_bytes.h"
#include "lib/jxl/base/status.h"
#if JPEGXL_ENABLE_APNG
#include "lib/extras/enc/apng.h"
#endif
#if JPEGXL_ENABLE_JPEG
#include "lib/extras/enc/jpg.h"
#endif
#if JPEGXL_ENABLE_EXR
#include "lib/extras/enc/exr.h"
#endif
#include "lib/extras/dec/decode.h"
#include "lib/extras/enc/pgx.h"
#include "lib/extras/enc/pnm.h"
#include "lib/extras/packed_image_convert.h"
#include "lib/jxl/base/file_io.h"
#include "lib/jxl/image_bundle.h"
namespace jxl {
namespace {
// Any valid encoding is larger (ensures codecs can read the first few bytes)
constexpr size_t kMinBytes = 9;
} // namespace
Status SetFromBytes(const Span<const uint8_t> bytes,
const extras::ColorHints& color_hints, CodecInOut* io,
ThreadPool* pool, const SizeConstraints* constraints,
extras::Codec* orig_codec) {
if (bytes.size() < kMinBytes) return JXL_FAILURE("Too few bytes");
extras::PackedPixelFile ppf;
if (extras::DecodeBytes(bytes, color_hints, &ppf, constraints, orig_codec)) {
return ConvertPackedPixelFileToCodecInOut(ppf, pool, io);
}
return JXL_FAILURE("Codecs failed to decode");
}
Status SetFromFile(const std::string& pathname,
const extras::ColorHints& color_hints, CodecInOut* io,
ThreadPool* pool, const SizeConstraints* constraints,
extras::Codec* orig_codec) {
std::vector<uint8_t> encoded;
JXL_RETURN_IF_ERROR(ReadFile(pathname, &encoded));
JXL_RETURN_IF_ERROR(SetFromBytes(Span<const uint8_t>(encoded), color_hints,
io, pool, constraints, orig_codec));
return true;
}
Status Encode(const CodecInOut& io, const extras::Codec codec,
const ColorEncoding& c_desired, size_t bits_per_sample,
std::vector<uint8_t>* bytes, ThreadPool* pool) {
JXL_CHECK(!io.Main().c_current().ICC().empty());
JXL_CHECK(!c_desired.ICC().empty());
io.CheckMetadata();
if (io.Main().IsJPEG()) {
JXL_WARNING("Writing JPEG data as pixels");
}
JxlPixelFormat format = {
0, // num_channels is ignored by the converter
bits_per_sample <= 8 ? JXL_TYPE_UINT8 : JXL_TYPE_UINT16, JXL_BIG_ENDIAN,
0};
const bool floating_point = bits_per_sample > 16;
std::unique_ptr<extras::Encoder> encoder;
std::ostringstream os;
switch (codec) {
case extras::Codec::kPNG:
#if JPEGXL_ENABLE_APNG
encoder = extras::GetAPNGEncoder();
break;
#else
return JXL_FAILURE("JPEG XL was built without (A)PNG support");
#endif
case extras::Codec::kJPG:
#if JPEGXL_ENABLE_JPEG
format.data_type = JXL_TYPE_UINT8;
encoder = extras::GetJPEGEncoder();
os << io.jpeg_quality;
encoder->SetOption("q", os.str());
break;
#else
return JXL_FAILURE("JPEG XL was built without JPEG support");
#endif
case extras::Codec::kPNM:
if (io.Main().HasAlpha()) {
encoder = extras::GetPAMEncoder();
} else if (io.Main().IsGray()) {
encoder = extras::GetPGMEncoder();
} else if (!floating_point) {
encoder = extras::GetPPMEncoder();
} else {
format.data_type = JXL_TYPE_FLOAT;
format.endianness = JXL_LITTLE_ENDIAN;
encoder = extras::GetPFMEncoder();
}
break;
case extras::Codec::kPGX:
encoder = extras::GetPGXEncoder();
break;
case extras::Codec::kGIF:
return JXL_FAILURE("Encoding to GIF is not implemented");
case extras::Codec::kEXR:
#if JPEGXL_ENABLE_EXR
format.data_type = JXL_TYPE_FLOAT;
encoder = extras::GetEXREncoder();
break;
#else
return JXL_FAILURE("JPEG XL was built without OpenEXR support");
#endif
case extras::Codec::kUnknown:
return JXL_FAILURE("Cannot encode using Codec::kUnknown");
}
if (!encoder) {
return JXL_FAILURE("Invalid codec.");
}
extras::PackedPixelFile ppf;
JXL_RETURN_IF_ERROR(
ConvertCodecInOutToPackedPixelFile(io, format, c_desired, pool, &ppf));
ppf.info.bits_per_sample = bits_per_sample;
if (format.data_type == JXL_TYPE_FLOAT) {
ppf.info.bits_per_sample = 32;
ppf.info.exponent_bits_per_sample = 8;
}
extras::EncodedImage encoded_image;
JXL_RETURN_IF_ERROR(encoder->Encode(ppf, &encoded_image, pool));
JXL_ASSERT(encoded_image.bitstreams.size() == 1);
*bytes = encoded_image.bitstreams[0];
return true;
}
Status EncodeToFile(const CodecInOut& io, const ColorEncoding& c_desired,
size_t bits_per_sample, const std::string& pathname,
ThreadPool* pool) {
const std::string extension = Extension(pathname);
const extras::Codec codec =
extras::CodecFromExtension(extension, &bits_per_sample);
// Warn about incorrect usage of PGM/PGX/PPM - only the latter supports
// color, but CodecFromExtension lumps them all together.
if (codec == extras::Codec::kPNM && extension != ".pfm") {
if (io.Main().HasAlpha() && extension != ".pam") {
JXL_WARNING(
"For images with alpha, the filename should end with .pam.\n");
} else if (!io.Main().IsGray() && extension == ".pgm") {
JXL_WARNING("For color images, the filename should end with .ppm.\n");
} else if (io.Main().IsGray() && extension == ".ppm") {
JXL_WARNING(
"For grayscale images, the filename should not end with .ppm.\n");
}
if (bits_per_sample > 16) {
JXL_WARNING("PPM only supports up to 16 bits per sample");
bits_per_sample = 16;
}
} else if (codec == extras::Codec::kPGX && !io.Main().IsGray()) {
JXL_WARNING("Storing color image to PGX - use .ppm extension instead.\n");
}
if (bits_per_sample > 16 && codec == extras::Codec::kPNG) {
JXL_WARNING("PNG only supports up to 16 bits per sample");
bits_per_sample = 16;
}
std::vector<uint8_t> encoded;
return Encode(io, codec, c_desired, bits_per_sample, &encoded, pool) &&
WriteFile(encoded, pathname);
}
Status EncodeToFile(const CodecInOut& io, const std::string& pathname,
ThreadPool* pool) {
// TODO(lode): need to take the floating_point_sample field into account
return EncodeToFile(io, io.metadata.m.color_encoding,
io.metadata.m.bit_depth.bits_per_sample, pathname, pool);
}
} // namespace jxl
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