diff options
Diffstat (limited to 'third_party/jpeg-xl/lib/jxl/decode_to_jpeg.cc')
| -rw-r--r-- | third_party/jpeg-xl/lib/jxl/decode_to_jpeg.cc | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/decode_to_jpeg.cc b/third_party/jpeg-xl/lib/jxl/decode_to_jpeg.cc new file mode 100644 index 0000000000..aa57b2723f --- /dev/null +++ b/third_party/jpeg-xl/lib/jxl/decode_to_jpeg.cc @@ -0,0 +1,169 @@ +// 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/jxl/decode_to_jpeg.h" + +namespace jxl { + +#if JPEGXL_ENABLE_TRANSCODE_JPEG + +JxlDecoderStatus JxlToJpegDecoder::Process(const uint8_t** next_in, + size_t* avail_in) { + if (!inside_box_) { + JXL_ABORT( + "processing of JPEG reconstruction data outside JPEG reconstruction " + "box"); + } + Span<const uint8_t> to_decode; + if (box_until_eof_) { + // Until EOF means consume all data. + to_decode = Span<const uint8_t>(*next_in, *avail_in); + *next_in += *avail_in; + *avail_in = 0; + } else { + // Defined size means consume min(available, needed). + size_t avail_recon_in = + std::min<size_t>(*avail_in, box_size_ - buffer_.size()); + to_decode = Span<const uint8_t>(*next_in, avail_recon_in); + *next_in += avail_recon_in; + *avail_in -= avail_recon_in; + } + bool old_data_exists = !buffer_.empty(); + if (old_data_exists) { + // Append incoming data to buffer if we already had data in the buffer. + buffer_.insert(buffer_.end(), to_decode.data(), + to_decode.data() + to_decode.size()); + to_decode = Span<const uint8_t>(buffer_.data(), buffer_.size()); + } + if (!box_until_eof_ && to_decode.size() > box_size_) { + JXL_ABORT("JPEG reconstruction data to decode larger than expected"); + } + if (box_until_eof_ || to_decode.size() == box_size_) { + // If undefined size, or the right size, try to decode. + jpeg_data_ = make_unique<jpeg::JPEGData>(); + const auto status = jpeg::DecodeJPEGData(to_decode, jpeg_data_.get()); + if (status.IsFatalError()) return JXL_DEC_ERROR; + if (status) { + // Successful decoding, emit event after updating state to track that we + // are no longer parsing JPEG reconstruction data. + inside_box_ = false; + return JXL_DEC_JPEG_RECONSTRUCTION; + } + if (box_until_eof_) { + // Unsuccessful decoding and undefined size, assume incomplete data. Copy + // the data if we haven't already. + if (!old_data_exists) { + buffer_.insert(buffer_.end(), to_decode.data(), + to_decode.data() + to_decode.size()); + } + } else { + // Unsuccessful decoding of correct amount of data, assume error. + return JXL_DEC_ERROR; + } + } else { + // Not enough data, copy the data if we haven't already. + if (!old_data_exists) { + buffer_.insert(buffer_.end(), to_decode.data(), + to_decode.data() + to_decode.size()); + } + } + return JXL_DEC_NEED_MORE_INPUT; +} + +size_t JxlToJpegDecoder::NumExifMarkers(const jpeg::JPEGData& jpeg_data) { + size_t num = 0; + for (size_t i = 0; i < jpeg_data.app_data.size(); ++i) { + if (jpeg_data.app_marker_type[i] == jxl::jpeg::AppMarkerType::kExif) { + num++; + } + } + return num; +} + +size_t JxlToJpegDecoder::NumXmpMarkers(const jpeg::JPEGData& jpeg_data) { + size_t num = 0; + for (size_t i = 0; i < jpeg_data.app_data.size(); ++i) { + if (jpeg_data.app_marker_type[i] == jxl::jpeg::AppMarkerType::kXMP) { + num++; + } + } + return num; +} + +JxlDecoderStatus JxlToJpegDecoder::ExifBoxContentSize( + const jpeg::JPEGData& jpeg_data, size_t* size) { + for (size_t i = 0; i < jpeg_data.app_data.size(); ++i) { + if (jpeg_data.app_marker_type[i] == jxl::jpeg::AppMarkerType::kExif) { + if (jpeg_data.app_data[i].size() < 3 + sizeof(jpeg::kExifTag)) { + // too small for app marker header + return JXL_DEC_ERROR; + } + // The first 4 bytes are the TIFF header from the box contents, and are + // not included in the JPEG + *size = jpeg_data.app_data[i].size() + 4 - 3 - sizeof(jpeg::kExifTag); + return JXL_DEC_SUCCESS; + } + } + return JXL_DEC_ERROR; +} + +JxlDecoderStatus JxlToJpegDecoder::XmlBoxContentSize( + const jpeg::JPEGData& jpeg_data, size_t* size) { + for (size_t i = 0; i < jpeg_data.app_data.size(); ++i) { + if (jpeg_data.app_marker_type[i] == jxl::jpeg::AppMarkerType::kXMP) { + if (jpeg_data.app_data[i].size() < 3 + sizeof(jpeg::kXMPTag)) { + // too small for app marker header + return JXL_DEC_ERROR; + } + *size = jpeg_data.app_data[i].size() - 3 - sizeof(jpeg::kXMPTag); + return JXL_DEC_SUCCESS; + } + } + return JXL_DEC_ERROR; +} + +JxlDecoderStatus JxlToJpegDecoder::SetExif(const uint8_t* data, size_t size, + jpeg::JPEGData* jpeg_data) { + for (size_t i = 0; i < jpeg_data->app_data.size(); ++i) { + if (jpeg_data->app_marker_type[i] == jxl::jpeg::AppMarkerType::kExif) { + if (jpeg_data->app_data[i].size() != + size + 3 + sizeof(jpeg::kExifTag) - 4) + return JXL_DEC_ERROR; + // The first 9 bytes are used for JPEG marker header. + jpeg_data->app_data[i][0] = 0xE1; + // The second and third byte are already filled in correctly + memcpy(jpeg_data->app_data[i].data() + 3, jpeg::kExifTag, + sizeof(jpeg::kExifTag)); + // The first 4 bytes are the TIFF header from the box contents, and are + // not included in the JPEG + memcpy(jpeg_data->app_data[i].data() + 3 + sizeof(jpeg::kExifTag), + data + 4, size - 4); + return JXL_DEC_SUCCESS; + } + } + return JXL_DEC_ERROR; +} +JxlDecoderStatus JxlToJpegDecoder::SetXmp(const uint8_t* data, size_t size, + jpeg::JPEGData* jpeg_data) { + for (size_t i = 0; i < jpeg_data->app_data.size(); ++i) { + if (jpeg_data->app_marker_type[i] == jxl::jpeg::AppMarkerType::kXMP) { + if (jpeg_data->app_data[i].size() != size + 3 + sizeof(jpeg::kXMPTag)) + return JXL_DEC_ERROR; + // The first 9 bytes are used for JPEG marker header. + jpeg_data->app_data[i][0] = 0xE1; + // The second and third byte are already filled in correctly + memcpy(jpeg_data->app_data[i].data() + 3, jpeg::kXMPTag, + sizeof(jpeg::kXMPTag)); + memcpy(jpeg_data->app_data[i].data() + 3 + sizeof(jpeg::kXMPTag), data, + size); + return JXL_DEC_SUCCESS; + } + } + return JXL_DEC_ERROR; +} + +#endif // JPEGXL_ENABLE_TRANSCODE_JPEG + +} // namespace jxl |