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112 lines
2.6 KiB
C++
112 lines
2.6 KiB
C++
/*
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* Copyright (c) 2023, Lucas Chollet <lucas.chollet@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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// These names are defined in B.1.1.3 - Marker assignments
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#define JPEG_APPN0 0XFFE0
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#define JPEG_APPN1 0XFFE1
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#define JPEG_APPN2 0XFFE2
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#define JPEG_APPN3 0XFFE3
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#define JPEG_APPN4 0XFFE4
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#define JPEG_APPN5 0XFFE5
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#define JPEG_APPN6 0XFFE6
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#define JPEG_APPN7 0XFFE7
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#define JPEG_APPN8 0XFFE8
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#define JPEG_APPN9 0XFFE9
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#define JPEG_APPN10 0XFFEA
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#define JPEG_APPN11 0XFFEB
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#define JPEG_APPN12 0XFFEC
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#define JPEG_APPN13 0XFFED
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#define JPEG_APPN14 0xFFEE
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#define JPEG_APPN15 0xFFEF
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#define JPEG_RESERVED1 0xFFF1
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#define JPEG_RESERVED2 0xFFF2
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#define JPEG_RESERVED3 0xFFF3
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#define JPEG_RESERVED4 0xFFF4
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#define JPEG_RESERVED5 0xFFF5
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#define JPEG_RESERVED6 0xFFF6
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#define JPEG_RESERVED7 0xFFF7
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#define JPEG_RESERVED8 0xFFF8
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#define JPEG_RESERVED9 0xFFF9
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#define JPEG_RESERVEDA 0xFFFA
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#define JPEG_RESERVEDB 0xFFFB
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#define JPEG_RESERVEDC 0xFFFC
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#define JPEG_RESERVEDD 0xFFFD
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#define JPEG_RST0 0xFFD0
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#define JPEG_RST1 0xFFD1
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#define JPEG_RST2 0xFFD2
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#define JPEG_RST3 0xFFD3
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#define JPEG_RST4 0xFFD4
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#define JPEG_RST5 0xFFD5
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#define JPEG_RST6 0xFFD6
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#define JPEG_RST7 0xFFD7
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#define JPEG_ZRL 0xF0
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#define JPEG_DHP 0xFFDE
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#define JPEG_EXP 0xFFDF
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#define JPEG_DAC 0XFFCC
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#define JPEG_DHT 0XFFC4
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#define JPEG_DQT 0XFFDB
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#define JPEG_EOI 0xFFD9
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#define JPEG_DRI 0XFFDD
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#define JPEG_SOF0 0XFFC0
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#define JPEG_SOF1 0XFFC1
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#define JPEG_SOF2 0xFFC2
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#define JPEG_SOF15 0xFFCF
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#define JPEG_SOI 0XFFD8
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#define JPEG_SOS 0XFFDA
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#define JPEG_COM 0xFFFE
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namespace Gfx {
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using Marker = u16;
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constexpr static u8 zigzag_map[64] {
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0, 1, 8, 16, 9, 2, 3, 10,
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17, 24, 32, 25, 18, 11, 4, 5,
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12, 19, 26, 33, 40, 48, 41, 34,
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27, 20, 13, 6, 7, 14, 21, 28,
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35, 42, 49, 56, 57, 50, 43, 36,
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29, 22, 15, 23, 30, 37, 44, 51,
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58, 59, 52, 45, 38, 31, 39, 46,
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53, 60, 61, 54, 47, 55, 62, 63
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};
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/**
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* MCU means group of data units that are coded together. A data unit is an 8x8
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* block of component data. In interleaved scans, number of non-interleaved data
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* units of a component C is Ch * Cv, where Ch and Cv represent the horizontal &
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* vertical subsampling factors of the component, respectively. A MacroBlock is
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* an 8x8 block of RGB values before encoding, and 8x8 block of YCbCr values when
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* we're done decoding the huffman stream.
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*/
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struct Macroblock {
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union {
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i16 y[64] = { 0 };
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i16 r[64];
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};
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union {
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i16 cb[64] = { 0 };
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i16 g[64];
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};
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union {
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i16 cr[64] = { 0 };
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i16 b[64];
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};
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i16 k[64] = { 0 };
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};
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}
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