From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- third_party/jpeg-xl/lib/jxl/headers.h | 97 +++++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) create mode 100644 third_party/jpeg-xl/lib/jxl/headers.h (limited to 'third_party/jpeg-xl/lib/jxl/headers.h') diff --git a/third_party/jpeg-xl/lib/jxl/headers.h b/third_party/jpeg-xl/lib/jxl/headers.h new file mode 100644 index 0000000000..3cce84dabc --- /dev/null +++ b/third_party/jpeg-xl/lib/jxl/headers.h @@ -0,0 +1,97 @@ +// 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_HEADERS_H_ +#define LIB_JXL_HEADERS_H_ + +// Codestream headers. + +#include +#include + +#include "lib/jxl/base/compiler_specific.h" +#include "lib/jxl/base/status.h" +#include "lib/jxl/dec_bit_reader.h" +#include "lib/jxl/field_encodings.h" + +namespace jxl { + +// Reserved by ISO/IEC 10918-1. LF causes files opened in text mode to be +// rejected because the marker changes to 0x0D instead. The 0xFF prefix also +// ensures there were no 7-bit transmission limitations. +static constexpr uint8_t kCodestreamMarker = 0x0A; + +// Compact representation of image dimensions (best case: 9 bits) so decoders +// can preallocate early. +class SizeHeader : public Fields { + public: + SizeHeader(); + JXL_FIELDS_NAME(SizeHeader) + + Status VisitFields(Visitor* JXL_RESTRICT visitor) override; + + Status Set(size_t xsize, size_t ysize); + + size_t xsize() const; + size_t ysize() const { + return small_ ? ((ysize_div8_minus_1_ + 1) * 8) : ysize_; + } + + private: + bool small_; // xsize and ysize <= 256 and divisible by 8. + + uint32_t ysize_div8_minus_1_; + uint32_t ysize_; + + uint32_t ratio_; + uint32_t xsize_div8_minus_1_; + uint32_t xsize_; +}; + +// (Similar to SizeHeader but different encoding because previews are smaller) +class PreviewHeader : public Fields { + public: + PreviewHeader(); + JXL_FIELDS_NAME(PreviewHeader) + + Status VisitFields(Visitor* JXL_RESTRICT visitor) override; + + Status Set(size_t xsize, size_t ysize); + + size_t xsize() const; + size_t ysize() const { return div8_ ? (ysize_div8_ * 8) : ysize_; } + + private: + bool div8_; // xsize and ysize divisible by 8. + + uint32_t ysize_div8_; + uint32_t ysize_; + + uint32_t ratio_; + uint32_t xsize_div8_; + uint32_t xsize_; +}; + +struct AnimationHeader : public Fields { + AnimationHeader(); + JXL_FIELDS_NAME(AnimationHeader) + + Status VisitFields(Visitor* JXL_RESTRICT visitor) override; + + // Ticks per second (expressed as rational number to support NTSC) + uint32_t tps_numerator; + uint32_t tps_denominator; + + uint32_t num_loops; // 0 means to repeat infinitely. + + bool have_timecodes; +}; + +Status ReadSizeHeader(BitReader* JXL_RESTRICT reader, + SizeHeader* JXL_RESTRICT size); + +} // namespace jxl + +#endif // LIB_JXL_HEADERS_H_ -- cgit v1.2.3