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