| 0,0 → 1,120 |
|---|
| /* |
| * 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 |
| |