forked from KolibriOS/kolibrios
121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
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/*
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* Small jpeg decoder library (Internal header)
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*
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* Copyright (c) 2006, Luc Saillard <luc@saillard.org>
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* Copyright (c) 2012 Intel Corporation.
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* - Neither the name of the author nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef __TINYJPEG_INTERNAL_H_
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#define __TINYJPEG_INTERNAL_H_
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#include <setjmp.h>
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#define SANITY_CHECK 1
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struct jdec_private;
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#define HUFFMAN_BITS_SIZE 256
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#define HUFFMAN_TABLES 4
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#define COMPONENTS 4
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#define JPEG_MAX_WIDTH 2048
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#define JPEG_MAX_HEIGHT 2048
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enum std_markers {
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DQT = 0xDB, /* Define Quantization Table */
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SOF = 0xC0, /* Start of Frame (size information) */
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DHT = 0xC4, /* Huffman Table */
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SOI = 0xD8, /* Start of Image */
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SOS = 0xDA, /* Start of Scan */
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RST = 0xD0, /* Reset Marker d0 -> .. */
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RST7 = 0xD7, /* Reset Marker .. -> d7 */
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EOI = 0xD9, /* End of Image */
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DRI = 0xDD, /* Define Restart Interval */
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APP0 = 0xE0,
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};
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struct huffman_table
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{
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/*bits and values*/
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unsigned char bits[16];
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unsigned char values[256];
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};
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struct component
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{
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unsigned int Hfactor;
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unsigned int Vfactor;
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unsigned char quant_table_index;
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unsigned int cid;
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};
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typedef void (*decode_MCU_fct) (struct jdec_private *priv);
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typedef void (*convert_colorspace_fct) (struct jdec_private *priv);
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struct jpeg_sos
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{
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unsigned int nr_components;
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struct {
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unsigned int component_id;
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unsigned int dc_selector;
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unsigned int ac_selector;
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}components[4];
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};
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struct jdec_private
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{
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/* Public variables */
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unsigned int width, height; /* Size of the image */
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/* Private variables */
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const unsigned char *stream_begin, *stream_end;
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unsigned int stream_length;
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const unsigned char *stream; /* Pointer to the current stream */
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struct component component_infos[COMPONENTS];
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unsigned int nf_components;
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unsigned char Q_tables[COMPONENTS][64]; /* quantization tables, zigzag*/
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unsigned char Q_tables_valid[COMPONENTS];
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struct huffman_table HTDC[HUFFMAN_TABLES]; /* DC huffman tables */
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unsigned char HTDC_valid[HUFFMAN_TABLES];
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struct huffman_table HTAC[HUFFMAN_TABLES]; /* AC huffman tables */
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unsigned char HTAC_valid[HUFFMAN_TABLES];
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struct jpeg_sos cur_sos; /* current sos values*/
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int default_huffman_table_initialized;
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int restart_interval;
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};
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#endif
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