7e3acc0e0a
The IJG README file has been renamed to README.ijg, in order to avoid confusion (many people were assuming that that was our project's README file and weren't reading README-turbo.txt) and to lay the groundwork for markdown versions of the libjpeg-turbo README and build instructions.
135 lines
5.2 KiB
C
135 lines
5.2 KiB
C
/*
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* jstdhuff.c
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1991-1998, Thomas G. Lane.
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* libjpeg-turbo Modifications:
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* Copyright (C) 2013, D. R. Commander.
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* For conditions of distribution and use, see the accompanying README.ijg
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* file.
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*
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* This file contains routines to set the default Huffman tables, if they are
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* not already set.
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*/
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/*
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* Huffman table setup routines
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*/
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LOCAL(void)
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add_huff_table (j_common_ptr cinfo,
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JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val)
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/* Define a Huffman table */
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{
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int nsymbols, len;
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if (*htblptr == NULL)
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*htblptr = jpeg_alloc_huff_table(cinfo);
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else
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return;
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/* Copy the number-of-symbols-of-each-code-length counts */
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MEMCOPY((*htblptr)->bits, bits, sizeof((*htblptr)->bits));
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/* Validate the counts. We do this here mainly so we can copy the right
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* number of symbols from the val[] array, without risking marching off
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* the end of memory. jchuff.c will do a more thorough test later.
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*/
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nsymbols = 0;
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for (len = 1; len <= 16; len++)
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nsymbols += bits[len];
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if (nsymbols < 1 || nsymbols > 256)
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ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
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MEMCOPY((*htblptr)->huffval, val, nsymbols * sizeof(UINT8));
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/* Initialize sent_table FALSE so table will be written to JPEG file. */
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(*htblptr)->sent_table = FALSE;
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}
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LOCAL(void)
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std_huff_tables (j_common_ptr cinfo)
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/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
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/* IMPORTANT: these are only valid for 8-bit data precision! */
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{
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JHUFF_TBL **dc_huff_tbl_ptrs, **ac_huff_tbl_ptrs;
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static const UINT8 bits_dc_luminance[17] =
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{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
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static const UINT8 val_dc_luminance[] =
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
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static const UINT8 bits_dc_chrominance[17] =
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{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
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static const UINT8 val_dc_chrominance[] =
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
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static const UINT8 bits_ac_luminance[17] =
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{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
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static const UINT8 val_ac_luminance[] =
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{ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
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0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
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0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
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0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
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0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
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0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
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0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
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0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
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0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
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0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
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0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
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0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
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0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
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0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
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0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
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0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
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0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
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0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa };
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static const UINT8 bits_ac_chrominance[17] =
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{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
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static const UINT8 val_ac_chrominance[] =
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{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
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0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
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0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
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0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
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0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
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0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
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0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
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0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
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0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
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0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
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0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
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0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
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0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
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0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
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0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
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0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
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0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
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0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
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0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa };
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if (cinfo->is_decompressor) {
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dc_huff_tbl_ptrs = ((j_decompress_ptr)cinfo)->dc_huff_tbl_ptrs;
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ac_huff_tbl_ptrs = ((j_decompress_ptr)cinfo)->ac_huff_tbl_ptrs;
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} else {
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dc_huff_tbl_ptrs = ((j_compress_ptr)cinfo)->dc_huff_tbl_ptrs;
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ac_huff_tbl_ptrs = ((j_compress_ptr)cinfo)->ac_huff_tbl_ptrs;
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}
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add_huff_table(cinfo, &dc_huff_tbl_ptrs[0], bits_dc_luminance,
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val_dc_luminance);
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add_huff_table(cinfo, &ac_huff_tbl_ptrs[0], bits_ac_luminance,
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val_ac_luminance);
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add_huff_table(cinfo, &dc_huff_tbl_ptrs[1], bits_dc_chrominance,
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val_dc_chrominance);
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add_huff_table(cinfo, &ac_huff_tbl_ptrs[1], bits_ac_chrominance,
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val_ac_chrominance);
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}
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