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| Rev | Author | Line No. | Line |
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| 5362 | serge | 1 | /* |
| 2 | * Small jpeg decoder library (Internal header) |
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| 3 | * |
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| 4 | * Copyright (c) 2006, Luc Saillard |
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| 5 | * Copyright (c) 2012 Intel Corporation. |
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| 6 | * All rights reserved. |
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| 7 | * Redistribution and use in source and binary forms, with or without |
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| 8 | * modification, are permitted provided that the following conditions are met: |
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| 9 | * |
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| 10 | * - Redistributions of source code must retain the above copyright notice, |
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| 11 | * this list of conditions and the following disclaimer. |
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| 12 | * |
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| 13 | * - Redistributions in binary form must reproduce the above copyright notice, |
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| 14 | * this list of conditions and the following disclaimer in the documentation |
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| 15 | * and/or other materials provided with the distribution. |
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| 16 | * |
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| 17 | * - Neither the name of the author nor the names of its contributors may be |
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| 18 | * used to endorse or promote products derived from this software without |
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| 19 | * specific prior written permission. |
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| 20 | * |
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 22 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 25 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 30 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 31 | * POSSIBILITY OF SUCH DAMAGE. |
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| 32 | * |
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| 33 | */ |
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| 34 | |||
| 35 | |||
| 36 | #ifndef __TINYJPEG_INTERNAL_H_ |
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| 37 | #define __TINYJPEG_INTERNAL_H_ |
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| 38 | |||
| 39 | #include |
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| 40 | |||
| 41 | #define SANITY_CHECK 1 |
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| 42 | |||
| 43 | struct jdec_private; |
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| 44 | |||
| 45 | #define HUFFMAN_BITS_SIZE 256 |
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| 46 | |||
| 47 | #define HUFFMAN_TABLES 4 |
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| 48 | #define COMPONENTS 4 |
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| 49 | #define JPEG_MAX_WIDTH 2048 |
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| 50 | #define JPEG_MAX_HEIGHT 2048 |
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| 51 | |||
| 52 | enum std_markers { |
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| 53 | DQT = 0xDB, /* Define Quantization Table */ |
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| 54 | SOF = 0xC0, /* Start of Frame (size information) */ |
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| 55 | DHT = 0xC4, /* Huffman Table */ |
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| 56 | SOI = 0xD8, /* Start of Image */ |
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| 57 | SOS = 0xDA, /* Start of Scan */ |
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| 58 | RST = 0xD0, /* Reset Marker d0 -> .. */ |
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| 59 | RST7 = 0xD7, /* Reset Marker .. -> d7 */ |
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| 60 | EOI = 0xD9, /* End of Image */ |
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| 61 | DRI = 0xDD, /* Define Restart Interval */ |
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| 62 | APP0 = 0xE0, |
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| 63 | }; |
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| 64 | |||
| 65 | |||
| 66 | struct huffman_table |
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| 67 | { |
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| 68 | /*bits and values*/ |
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| 69 | unsigned char bits[16]; |
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| 70 | unsigned char values[256]; |
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| 71 | }; |
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| 72 | |||
| 73 | struct component |
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| 74 | { |
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| 75 | unsigned int Hfactor; |
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| 76 | unsigned int Vfactor; |
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| 77 | unsigned char quant_table_index; |
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| 78 | unsigned int cid; |
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| 79 | }; |
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| 80 | |||
| 81 | |||
| 82 | typedef void (*decode_MCU_fct) (struct jdec_private *priv); |
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| 83 | typedef void (*convert_colorspace_fct) (struct jdec_private *priv); |
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| 84 | |||
| 85 | struct jpeg_sos |
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| 86 | { |
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| 87 | unsigned int nr_components; |
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| 88 | struct { |
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| 89 | unsigned int component_id; |
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| 90 | unsigned int dc_selector; |
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| 91 | unsigned int ac_selector; |
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| 92 | }components[4]; |
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| 93 | }; |
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| 94 | |||
| 95 | struct jdec_private |
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| 96 | { |
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| 97 | /* Public variables */ |
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| 98 | unsigned int width, height; /* Size of the image */ |
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| 99 | |||
| 100 | /* Private variables */ |
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| 101 | const unsigned char *stream_begin, *stream_end; |
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| 102 | unsigned int stream_length; |
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| 103 | |||
| 104 | const unsigned char *stream; /* Pointer to the current stream */ |
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| 105 | |||
| 106 | struct component component_infos[COMPONENTS]; |
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| 107 | unsigned int nf_components; |
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| 108 | unsigned char Q_tables[COMPONENTS][64]; /* quantization tables, zigzag*/ |
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| 109 | unsigned char Q_tables_valid[COMPONENTS]; |
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| 110 | struct huffman_table HTDC[HUFFMAN_TABLES]; /* DC huffman tables */ |
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| 111 | unsigned char HTDC_valid[HUFFMAN_TABLES]; |
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| 112 | struct huffman_table HTAC[HUFFMAN_TABLES]; /* AC huffman tables */ |
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| 113 | unsigned char HTAC_valid[HUFFMAN_TABLES]; |
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| 114 | struct jpeg_sos cur_sos; /* current sos values*/ |
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| 115 | int default_huffman_table_initialized; |
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| 116 | int restart_interval; |
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| 117 | }; |
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| 118 | |||
| 119 | #endif |
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| 120 |