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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /third_party/jpeg-xl/lib/jxl/jpeg/dec_jpeg_output_chunk.h | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/jpeg-xl/lib/jxl/jpeg/dec_jpeg_output_chunk.h')
-rw-r--r-- | third_party/jpeg-xl/lib/jxl/jpeg/dec_jpeg_output_chunk.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/jpeg/dec_jpeg_output_chunk.h b/third_party/jpeg-xl/lib/jxl/jpeg/dec_jpeg_output_chunk.h new file mode 100644 index 0000000000..e003c04952 --- /dev/null +++ b/third_party/jpeg-xl/lib/jxl/jpeg/dec_jpeg_output_chunk.h @@ -0,0 +1,72 @@ +// 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. + +#ifndef LIB_JXL_JPEG_DEC_JPEG_OUTPUT_CHUNK_H_ +#define LIB_JXL_JPEG_DEC_JPEG_OUTPUT_CHUNK_H_ + +#include <stddef.h> +#include <stdint.h> + +#include <initializer_list> +#include <memory> +#include <vector> + +namespace jxl { +namespace jpeg { + +/** + * A chunk of output data. + * + * Data producer creates OutputChunks and adds them to the end output queue. + * Once control flow leaves the producer code, it is considered that chunk of + * data is final and can not be changed; to underline this fact |next| is a + * const-pointer. + * + * Data consumer removes OutputChunks from the beginning of the output queue. + * It is possible to consume OutputChunks partially, by updating |next| and + * |len|. + * + * There are 2 types of output chunks: + * - owning: actual data is stored in |buffer| field; producer fills data after + * the instance it created; it is legal to reduce |len| to show that not all + * the capacity of |buffer| is used + * - non-owning: represents the data stored (owned) somewhere else + */ +struct OutputChunk { + // Non-owning + template <typename Bytes> + explicit OutputChunk(Bytes& bytes) : len(bytes.size()) { + // Deal both with const qualifier and data type. + const void* src = bytes.data(); + next = reinterpret_cast<const uint8_t*>(src); + } + + // Non-owning + OutputChunk(const uint8_t* data, size_t size) : next(data), len(size) {} + + // Owning + explicit OutputChunk(size_t size = 0) { + buffer.reset(new std::vector<uint8_t>(size)); + next = buffer->data(); + len = size; + } + + // Owning + OutputChunk(std::initializer_list<uint8_t> bytes) { + buffer.reset(new std::vector<uint8_t>(bytes)); + next = buffer->data(); + len = bytes.size(); + } + + const uint8_t* next; + size_t len; + // TODO(veluca): consider removing the unique_ptr. + std::unique_ptr<std::vector<uint8_t>> buffer; +}; + +} // namespace jpeg +} // namespace jxl + +#endif // LIB_JXL_JPEG_DEC_JPEG_OUTPUT_CHUNK_H_ |