diff options
Diffstat (limited to 'third_party/jpeg-xl/lib/extras/enc/encode.cc')
| -rw-r--r-- | third_party/jpeg-xl/lib/extras/enc/encode.cc | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/extras/enc/encode.cc b/third_party/jpeg-xl/lib/extras/enc/encode.cc new file mode 100644 index 0000000000..9ffba9d0dd --- /dev/null +++ b/third_party/jpeg-xl/lib/extras/enc/encode.cc @@ -0,0 +1,170 @@ +// 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> + +#if JPEGXL_ENABLE_APNG +#include "lib/extras/enc/apng.h" +#endif +#if JPEGXL_ENABLE_EXR +#include "lib/extras/enc/exr.h" +#endif +#if JPEGXL_ENABLE_JPEG +#include "lib/extras/enc/jpg.h" +#endif +#include "lib/extras/enc/npy.h" +#include "lib/extras/enc/pgx.h" +#include "lib/extras/enc/pnm.h" +#include "lib/jxl/base/printf_macros.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)) || + (data_type == JXL_TYPE_FLOAT && + (bits_per_sample != 32 || exponent_bits != 8))) { + return JXL_FAILURE( + "Incompatible data_type %d and bit depth %u with exponent bits %u", + (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; +} + +Status SelectFormat(const std::vector<JxlPixelFormat>& accepted_formats, + const JxlBasicInfo& basic_info, JxlPixelFormat* format) { + const size_t original_bit_depth = basic_info.bits_per_sample; + size_t current_bit_depth = 0; + size_t num_alpha_channels = (basic_info.alpha_bits != 0 ? 1 : 0); + size_t num_channels = basic_info.num_color_channels + num_alpha_channels; + for (;;) { + for (const JxlPixelFormat& candidate : accepted_formats) { + if (candidate.num_channels != num_channels) continue; + const size_t candidate_bit_depth = + PackedImage::BitsPerChannel(candidate.data_type); + if ( + // Candidate bit depth is less than what we have and still enough + (original_bit_depth <= candidate_bit_depth && + candidate_bit_depth < current_bit_depth) || + // Or larger than the too-small bit depth we currently have + (current_bit_depth < candidate_bit_depth && + current_bit_depth < original_bit_depth)) { + *format = candidate; + current_bit_depth = candidate_bit_depth; + } + } + if (current_bit_depth == 0) { + if (num_channels > basic_info.num_color_channels) { + // Try dropping the alpha channel. + --num_channels; + continue; + } + return JXL_FAILURE("no appropriate format found"); + } + break; + } + if (current_bit_depth < original_bit_depth) { + JXL_WARNING("encoding %" PRIuS "-bit original to %" PRIuS " bits", + original_bit_depth, current_bit_depth); + } + 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 JPEGXL_ENABLE_APNG + if (extension == ".png" || extension == ".apng") return GetAPNGEncoder(); +#endif + +#if JPEGXL_ENABLE_JPEG + if (extension == ".jpg") return GetJPEGEncoder(); + if (extension == ".jpeg") return GetJPEGEncoder(); +#endif + + 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 == ".pfm") return GetPFMEncoder(); + +#if JPEGXL_ENABLE_EXR + if (extension == ".exr") return GetEXREncoder(); +#endif + + return nullptr; +} + +} // namespace extras +} // namespace jxl |