68 lines
1.7 KiB
C++
68 lines
1.7 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_DEC_PNM_H_
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#define LIB_EXTRAS_DEC_PNM_H_
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// Decodes PBM/PGM/PPM/PFM pixels in memory.
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#include <stddef.h>
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#include <stdint.h>
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// TODO(janwas): workaround for incorrect Win64 codegen (cause unknown)
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#include <hwy/highway.h>
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#include <mutex>
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#include "lib/extras/dec/color_hints.h"
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#include "lib/extras/mmap.h"
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#include "lib/extras/packed_image.h"
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#include "lib/jxl/base/data_parallel.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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namespace jxl {
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struct SizeConstraints;
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namespace extras {
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// Decodes `bytes` into `ppf`. color_hints may specify "color_space", which
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// defaults to sRGB.
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Status DecodeImagePNM(Span<const uint8_t> bytes, const ColorHints& color_hints,
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PackedPixelFile* ppf,
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const SizeConstraints* constraints = nullptr);
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void TestCodecPNM();
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struct HeaderPNM {
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size_t xsize;
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size_t ysize;
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bool is_gray; // PGM
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bool has_alpha; // PAM
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size_t bits_per_sample;
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bool floating_point;
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bool big_endian;
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std::vector<JxlExtraChannelType> ec_types; // PAM
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};
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class ChunkedPNMDecoder {
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public:
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static StatusOr<ChunkedPNMDecoder> Init(const char* file_path);
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// Initializes `ppf` with a pointer to this `ChunkedPNMDecoder`.
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jxl::Status InitializePPF(const ColorHints& color_hints,
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PackedPixelFile* ppf);
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private:
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HeaderPNM header_ = {};
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size_t data_start_ = 0;
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MemoryMappedFile pnm_;
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friend struct PNMChunkedInputFrame;
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};
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} // namespace extras
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} // namespace jxl
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#endif // LIB_EXTRAS_DEC_PNM_H_
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