зеркало из https://github.com/mozilla/gecko-dev.git
48 строки
1.4 KiB
C++
48 строки
1.4 KiB
C++
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#ifndef LIB_EXTRAS_CODEC_JPG_H_
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#define LIB_EXTRAS_CODEC_JPG_H_
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// Encodes JPG pixels and metadata in memory.
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#include <stdint.h>
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#include "lib/extras/codec.h"
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#include "lib/jxl/base/data_parallel.h"
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#include "lib/jxl/base/padded_bytes.h"
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#include "lib/jxl/base/span.h"
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#include "lib/jxl/base/status.h"
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#include "lib/jxl/codec_in_out.h"
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namespace jxl {
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enum class JpegEncoder {
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kLibJpeg,
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kSJpeg,
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};
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static inline bool IsJPG(const Span<const uint8_t> bytes) {
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if (bytes.size() < 2) return false;
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if (bytes[0] != 0xFF || bytes[1] != 0xD8) return false;
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return true;
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}
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// Decodes `bytes` into `io`. io->dec_hints are ignored.
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// `elapsed_deinterleave`, if non-null, will be set to the time (in seconds)
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// that it took to deinterleave the raw JSAMPLEs to planar floats.
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Status DecodeImageJPG(Span<const uint8_t> bytes, ThreadPool* pool,
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CodecInOut* io, double* elapsed_deinterleave = nullptr);
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// Encodes into `bytes`.
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Status EncodeImageJPG(const CodecInOut* io, JpegEncoder encoder, size_t quality,
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YCbCrChromaSubsampling chroma_subsampling,
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ThreadPool* pool, PaddedBytes* bytes,
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DecodeTarget target = DecodeTarget::kPixels);
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} // namespace jxl
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#endif // LIB_EXTRAS_CODEC_JPG_H_
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