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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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* 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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|
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/* |
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* Ported to the D programming language by |
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* Tomas Lindquist Olsen <tomas@famolsen.dk> |
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*/ |
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|
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module tinyjpeg.internal; |
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//#include <setjmp.h> |
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version(Tango) |
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import tango.stdc.stdint; |
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else |
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import std.stdint; |
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// this enables a lot of error checking, set to 0 to disable |
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enum { SANITY_CHECK = 1 } |
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|
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enum |
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{ |
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HUFFMAN_BITS_SIZE = 256, |
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HUFFMAN_HASH_NBITS = 9, |
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HUFFMAN_HASH_SIZE = (1U<<HUFFMAN_HASH_NBITS), |
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HUFFMAN_HASH_MASK = (HUFFMAN_HASH_SIZE-1), |
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HUFFMAN_TABLES = 4, |
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COMPONENTS = 3, |
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JPEG_MAX_WIDTH = 2048, |
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JPEG_MAX_HEIGHT = 2048 |
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} |
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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 lookup[HUFFMAN_HASH_SIZE]; |
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/* code size: give the number of bits of a symbol is encoded */ |
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ubyte 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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uint Hfactor; |
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uint Vfactor; |
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float *Q_table; /* Pointer to the quantisation table to use */ |
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huffman_table *AC_table; |
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huffman_table *DC_table; |
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short previous_DC; /* Previous DC coefficient */ |
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short DCT[64]; /* DCT coef */ |
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static if (SANITY_CHECK) |
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{ |
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uint cid; |
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} |
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}; |
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typedef void (*decode_MCU_fct) (jdec_private *priv); |
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typedef void (*convert_colorspace_fct) (jdec_private *priv); |
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struct jdec_private |
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{ |
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/* Public variables */ |
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uint8_t *components[COMPONENTS]; |
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uint width, height; /* Size of the image */ |
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uint flags; |
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/* Private variables */ |
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const ubyte* stream_begin, stream_end; |
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uint stream_length; |
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const ubyte *stream; /* Pointer to the current stream */ |
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uint reservoir, nbits_in_reservoir; |
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component component_infos[COMPONENTS]; |
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float Q_tables[COMPONENTS][64]; /* quantization tables */ |
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huffman_table HTDC[HUFFMAN_TABLES]; /* DC huffman tables */ |
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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]; |
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uint8_t[64] Cr, Cb; |
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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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// error string |
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char[] error_string; |
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}; |
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