/* * Small jpeg decoder library (Internal header) * * Copyright (c) 2006, Luc Saillard <luc@saillard.org> * 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_ #ifdef _MSC_VER typedef signed __int8 int8_t; typedef unsigned __int8 uint8_t; typedef signed __int16 int16_t; typedef unsigned __int16 uint16_t; typedef signed __int32 int32_t; typedef unsigned __int32 uint32_t; typedef signed __int64 int64_t; typedef unsigned __int64 uint64_t; #else #ifdef NO_STDINT_H typedef unsigned char uint8_t; typedef signed char int8_t; typedef unsigned short uint16_t; typedef signed short int16_t; typedef unsigned int uint32_t; typedef signed int int32_t; typedef long long int64_t; typedef unsigned long long int64_t; #else #include <stdint.h> #endif #endif #include <setjmp.h> #define SANITY_CHECK 1 struct jdec_private; #define HUFFMAN_BITS_SIZE 256 #define HUFFMAN_HASH_NBITS 9 #define HUFFMAN_HASH_SIZE (1UL<<HUFFMAN_HASH_NBITS) #define HUFFMAN_HASH_MASK (HUFFMAN_HASH_SIZE-1) #define HUFFMAN_TABLES 4 #define COMPONENTS 3 #define JPEG_MAX_WIDTH 4096 #define JPEG_MAX_HEIGHT 4096 struct huffman_table { /* Fast look up table, using HUFFMAN_HASH_NBITS bits we can have directly the symbol, * if the symbol is <0, then we need to look into the tree table */ short int lookup[HUFFMAN_HASH_SIZE]; /* code size: give the number of bits of a symbol is encoded */ unsigned char code_size[HUFFMAN_HASH_SIZE]; /* some place to store value that is not encoded in the lookup table * FIXME: Calculate if 256 value is enough to store all values */ uint16_t slowtable[16-HUFFMAN_HASH_NBITS][256]; }; struct component { unsigned int Hfactor; unsigned int Vfactor; float *Q_table; /* Pointer to the quantisation table to use */ struct huffman_table *AC_table; struct huffman_table *DC_table; short int previous_DC; /* Previous DC coefficient */ short int DCT[64]; /* DCT coef */ #if SANITY_CHECK unsigned int cid; #endif }; typedef void (*decode_MCU_fct) (struct jdec_private *priv); typedef void (*convert_colorspace_fct) (struct jdec_private *priv); struct jdec_private { void *(*allocate_mem)(unsigned int amount); void (*free_mem)(void *mem); /* Public variables */ uint8_t *components[COMPONENTS]; unsigned int width, height; /* Size of the image */ unsigned int flags; /* Private variables */ const unsigned char *stream_begin, *stream_end; unsigned int stream_length; const unsigned char *stream; /* Pointer to the current stream */ unsigned int reservoir, nbits_in_reservoir; struct component component_infos[COMPONENTS]; float Q_tables[COMPONENTS][64]; /* quantization tables */ struct huffman_table HTDC[HUFFMAN_TABLES]; /* DC huffman tables */ struct huffman_table HTAC[HUFFMAN_TABLES]; /* AC huffman tables */ int default_huffman_table_initialized; int restart_interval; int restarts_to_go; /* MCUs left in this restart interval */ int last_rst_marker_seen; /* Rst marker is incremented each time */ /* Temp space used after the IDCT to store each components */ uint8_t Y[64*4], Cr[64], Cb[64]; jmp_buf jump_state; /* Internal Pointer use for colorspace conversion, do not modify it !!! */ uint8_t *plane[COMPONENTS]; uint8_t decomp_block[16][16*3]; }; #if defined(__GNUC__) && (__GNUC__ > 3) && defined(__OPTIMIZE__) #define __likely(x) __builtin_expect(!!(x), 1) #define __unlikely(x) __builtin_expect(!!(x), 0) #else #define __likely(x) (x) #define __unlikely(x) (x) #endif #define IDCT tinyjpeg_idct_float void tinyjpeg_idct_float (struct component *compptr, uint8_t *output_buf, int stride); #endif