163 lines
5.1 KiB
C
163 lines
5.1 KiB
C
/*
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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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* 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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#ifdef _MSC_VER
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typedef signed __int8 int8_t;
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typedef unsigned __int8 uint8_t;
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typedef signed __int16 int16_t;
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typedef unsigned __int16 uint16_t;
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typedef signed __int32 int32_t;
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typedef unsigned __int32 uint32_t;
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typedef signed __int64 int64_t;
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typedef unsigned __int64 uint64_t;
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#else
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#ifdef NO_STDINT_H
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typedef unsigned char uint8_t;
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typedef signed char int8_t;
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typedef unsigned short uint16_t;
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typedef signed short int16_t;
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typedef unsigned int uint32_t;
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typedef signed int int32_t;
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typedef long long int64_t;
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typedef unsigned long long int64_t;
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#else
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#include <stdint.h>
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#endif
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#endif
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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_HASH_NBITS 9
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#define HUFFMAN_HASH_SIZE (1UL<<HUFFMAN_HASH_NBITS)
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#define HUFFMAN_HASH_MASK (HUFFMAN_HASH_SIZE-1)
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#define HUFFMAN_TABLES 4
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#define COMPONENTS 3
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#define JPEG_MAX_WIDTH 4096
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#define JPEG_MAX_HEIGHT 4096
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struct huffman_table
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{
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/* Fast look up table, using HUFFMAN_HASH_NBITS bits we can have directly the symbol,
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* if the symbol is <0, then we need to look into the tree table */
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short int lookup[HUFFMAN_HASH_SIZE];
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/* code size: give the number of bits of a symbol is encoded */
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unsigned char code_size[HUFFMAN_HASH_SIZE];
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/* some place to store value that is not encoded in the lookup table
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* FIXME: Calculate if 256 value is enough to store all values
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*/
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uint16_t slowtable[16-HUFFMAN_HASH_NBITS][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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float *Q_table; /* Pointer to the quantisation table to use */
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struct huffman_table *AC_table;
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struct huffman_table *DC_table;
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short int previous_DC; /* Previous DC coefficient */
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short int DCT[64]; /* DCT coef */
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#if SANITY_CHECK
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unsigned int cid;
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#endif
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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 jdec_private
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{
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void *(*allocate_mem)(unsigned int amount);
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void (*free_mem)(void *mem);
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/* Public variables */
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uint8_t *components[COMPONENTS];
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unsigned int width, height; /* Size of the image */
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unsigned int flags;
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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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unsigned int reservoir, nbits_in_reservoir;
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struct component component_infos[COMPONENTS];
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float Q_tables[COMPONENTS][64]; /* quantization tables */
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struct huffman_table HTDC[HUFFMAN_TABLES]; /* DC huffman tables */
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struct huffman_table HTAC[HUFFMAN_TABLES]; /* AC huffman tables */
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int default_huffman_table_initialized;
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int restart_interval;
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int restarts_to_go; /* MCUs left in this restart interval */
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int last_rst_marker_seen; /* Rst marker is incremented each time */
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/* Temp space used after the IDCT to store each components */
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uint8_t Y[64*4], Cr[64], Cb[64];
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jmp_buf jump_state;
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/* Internal Pointer use for colorspace conversion, do not modify it !!! */
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uint8_t *plane[COMPONENTS];
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uint8_t decomp_block[16][16*3];
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};
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#if defined(__GNUC__) && (__GNUC__ > 3) && defined(__OPTIMIZE__)
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#define __likely(x) __builtin_expect(!!(x), 1)
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#define __unlikely(x) __builtin_expect(!!(x), 0)
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#else
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#define __likely(x) (x)
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#define __unlikely(x) (x)
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#endif
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#define IDCT tinyjpeg_idct_float
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void tinyjpeg_idct_float (struct component *compptr, uint8_t *output_buf, int stride);
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#endif
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