hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jpegint.h |
| 3 | * |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 4 | * This file was part of the Independent JPEG Group's software: |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 5 | * Copyright (C) 1991-1997, Thomas G. Lane. |
hbono@chromium.org | 9862697 | 2011-08-03 03:13:08 +0000 | [diff] [blame] | 6 | * Modified 1997-2009 by Guido Vollbeding. |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 7 | * libjpeg-turbo Modifications: |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 8 | * Copyright (C) 2015-2016, 2019, D. R. Commander. |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 9 | * Copyright (C) 2015, Google, Inc. |
| 10 | * For conditions of distribution and use, see the accompanying README.ijg |
| 11 | * file. |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 12 | * |
| 13 | * This file provides common declarations for the various JPEG modules. |
| 14 | * These declarations are considered internal to the JPEG library; most |
| 15 | * applications using the library shouldn't need to include this file. |
| 16 | */ |
| 17 | |
| 18 | |
| 19 | /* Declarations for both compression & decompression */ |
| 20 | |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 21 | typedef enum { /* Operating modes for buffer controllers */ |
| 22 | JBUF_PASS_THRU, /* Plain stripwise operation */ |
| 23 | /* Remaining modes require a full-image buffer to have been created */ |
| 24 | JBUF_SAVE_SOURCE, /* Run source subobject only, save output */ |
| 25 | JBUF_CRANK_DEST, /* Run dest subobject only, using saved data */ |
| 26 | JBUF_SAVE_AND_PASS /* Run both subobjects, save output */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 27 | } J_BUF_MODE; |
| 28 | |
| 29 | /* Values of global_state field (jdapi.c has some dependencies on ordering!) */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 30 | #define CSTATE_START 100 /* after create_compress */ |
| 31 | #define CSTATE_SCANNING 101 /* start_compress done, write_scanlines OK */ |
| 32 | #define CSTATE_RAW_OK 102 /* start_compress done, write_raw_data OK */ |
| 33 | #define CSTATE_WRCOEFS 103 /* jpeg_write_coefficients done */ |
| 34 | #define DSTATE_START 200 /* after create_decompress */ |
| 35 | #define DSTATE_INHEADER 201 /* reading header markers, no SOS yet */ |
| 36 | #define DSTATE_READY 202 /* found SOS, ready for start_decompress */ |
| 37 | #define DSTATE_PRELOAD 203 /* reading multiscan file in start_decompress*/ |
| 38 | #define DSTATE_PRESCAN 204 /* performing dummy pass for 2-pass quant */ |
| 39 | #define DSTATE_SCANNING 205 /* start_decompress done, read_scanlines OK */ |
| 40 | #define DSTATE_RAW_OK 206 /* start_decompress done, read_raw_data OK */ |
| 41 | #define DSTATE_BUFIMAGE 207 /* expecting jpeg_start_output */ |
| 42 | #define DSTATE_BUFPOST 208 /* looking for SOS/EOI in jpeg_finish_output */ |
| 43 | #define DSTATE_RDCOEFS 209 /* reading file in jpeg_read_coefficients */ |
| 44 | #define DSTATE_STOPPING 210 /* looking for EOI in jpeg_finish_decompress */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 45 | |
| 46 | |
| 47 | /* JLONG must hold at least signed 32-bit values. */ |
| 48 | typedef long JLONG; |
| 49 | |
| 50 | |
| 51 | /* |
| 52 | * Left shift macro that handles a negative operand without causing any |
| 53 | * sanitizer warnings |
| 54 | */ |
| 55 | |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 56 | #define LEFT_SHIFT(a, b) ((JLONG)((unsigned long)(a) << (b))) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 57 | |
| 58 | |
| 59 | /* Declarations for compression modules */ |
| 60 | |
| 61 | /* Master control module */ |
| 62 | struct jpeg_comp_master { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 63 | void (*prepare_for_pass) (j_compress_ptr cinfo); |
| 64 | void (*pass_startup) (j_compress_ptr cinfo); |
| 65 | void (*finish_pass) (j_compress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 66 | |
| 67 | /* State variables made visible to other modules */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 68 | boolean call_pass_startup; /* True if pass_startup must be called */ |
| 69 | boolean is_last_pass; /* True during last pass */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 70 | }; |
| 71 | |
| 72 | /* Main buffer control (downsampled-data buffer) */ |
| 73 | struct jpeg_c_main_controller { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 74 | void (*start_pass) (j_compress_ptr cinfo, J_BUF_MODE pass_mode); |
| 75 | void (*process_data) (j_compress_ptr cinfo, JSAMPARRAY input_buf, |
| 76 | JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 77 | }; |
| 78 | |
| 79 | /* Compression preprocessing (downsampling input buffer control) */ |
| 80 | struct jpeg_c_prep_controller { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 81 | void (*start_pass) (j_compress_ptr cinfo, J_BUF_MODE pass_mode); |
| 82 | void (*pre_process_data) (j_compress_ptr cinfo, JSAMPARRAY input_buf, |
| 83 | JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail, |
| 84 | JSAMPIMAGE output_buf, |
| 85 | JDIMENSION *out_row_group_ctr, |
| 86 | JDIMENSION out_row_groups_avail); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 87 | }; |
| 88 | |
| 89 | /* Coefficient buffer control */ |
| 90 | struct jpeg_c_coef_controller { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 91 | void (*start_pass) (j_compress_ptr cinfo, J_BUF_MODE pass_mode); |
| 92 | boolean (*compress_data) (j_compress_ptr cinfo, JSAMPIMAGE input_buf); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 93 | }; |
| 94 | |
| 95 | /* Colorspace conversion */ |
| 96 | struct jpeg_color_converter { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 97 | void (*start_pass) (j_compress_ptr cinfo); |
| 98 | void (*color_convert) (j_compress_ptr cinfo, JSAMPARRAY input_buf, |
| 99 | JSAMPIMAGE output_buf, JDIMENSION output_row, |
| 100 | int num_rows); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 101 | }; |
| 102 | |
| 103 | /* Downsampling */ |
| 104 | struct jpeg_downsampler { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 105 | void (*start_pass) (j_compress_ptr cinfo); |
| 106 | void (*downsample) (j_compress_ptr cinfo, JSAMPIMAGE input_buf, |
| 107 | JDIMENSION in_row_index, JSAMPIMAGE output_buf, |
| 108 | JDIMENSION out_row_group_index); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 109 | |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 110 | boolean need_context_rows; /* TRUE if need rows above & below */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 111 | }; |
| 112 | |
| 113 | /* Forward DCT (also controls coefficient quantization) */ |
| 114 | struct jpeg_forward_dct { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 115 | void (*start_pass) (j_compress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 116 | /* perhaps this should be an array??? */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 117 | void (*forward_DCT) (j_compress_ptr cinfo, jpeg_component_info *compptr, |
| 118 | JSAMPARRAY sample_data, JBLOCKROW coef_blocks, |
| 119 | JDIMENSION start_row, JDIMENSION start_col, |
| 120 | JDIMENSION num_blocks); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 121 | }; |
| 122 | |
| 123 | /* Entropy encoding */ |
| 124 | struct jpeg_entropy_encoder { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 125 | void (*start_pass) (j_compress_ptr cinfo, boolean gather_statistics); |
| 126 | boolean (*encode_mcu) (j_compress_ptr cinfo, JBLOCKROW *MCU_data); |
| 127 | void (*finish_pass) (j_compress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 128 | }; |
| 129 | |
| 130 | /* Marker writing */ |
| 131 | struct jpeg_marker_writer { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 132 | void (*write_file_header) (j_compress_ptr cinfo); |
| 133 | void (*write_frame_header) (j_compress_ptr cinfo); |
| 134 | void (*write_scan_header) (j_compress_ptr cinfo); |
| 135 | void (*write_file_trailer) (j_compress_ptr cinfo); |
| 136 | void (*write_tables_only) (j_compress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 137 | /* These routines are exported to allow insertion of extra markers */ |
| 138 | /* Probably only COM and APPn markers should be written this way */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 139 | void (*write_marker_header) (j_compress_ptr cinfo, int marker, |
| 140 | unsigned int datalen); |
| 141 | void (*write_marker_byte) (j_compress_ptr cinfo, int val); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 142 | }; |
| 143 | |
| 144 | |
| 145 | /* Declarations for decompression modules */ |
| 146 | |
| 147 | /* Master control module */ |
| 148 | struct jpeg_decomp_master { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 149 | void (*prepare_for_output_pass) (j_decompress_ptr cinfo); |
| 150 | void (*finish_output_pass) (j_decompress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 151 | |
| 152 | /* State variables made visible to other modules */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 153 | boolean is_dummy_pass; /* True during 1st pass for 2-pass quant */ |
| 154 | |
| 155 | /* Partial decompression variables */ |
| 156 | JDIMENSION first_iMCU_col; |
| 157 | JDIMENSION last_iMCU_col; |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 158 | JDIMENSION first_MCU_col[MAX_COMPONENTS]; |
| 159 | JDIMENSION last_MCU_col[MAX_COMPONENTS]; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 160 | boolean jinit_upsampler_no_alloc; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 161 | |
| 162 | /* Last iMCU row that was successfully decoded */ |
| 163 | JDIMENSION last_good_iMCU_row; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 164 | }; |
| 165 | |
| 166 | /* Input control module */ |
| 167 | struct jpeg_input_controller { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 168 | int (*consume_input) (j_decompress_ptr cinfo); |
| 169 | void (*reset_input_controller) (j_decompress_ptr cinfo); |
| 170 | void (*start_input_pass) (j_decompress_ptr cinfo); |
| 171 | void (*finish_input_pass) (j_decompress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 172 | |
| 173 | /* State variables made visible to other modules */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 174 | boolean has_multiple_scans; /* True if file has multiple scans */ |
| 175 | boolean eoi_reached; /* True when EOI has been consumed */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 176 | }; |
| 177 | |
| 178 | /* Main buffer control (downsampled-data buffer) */ |
| 179 | struct jpeg_d_main_controller { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 180 | void (*start_pass) (j_decompress_ptr cinfo, J_BUF_MODE pass_mode); |
| 181 | void (*process_data) (j_decompress_ptr cinfo, JSAMPARRAY output_buf, |
| 182 | JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 183 | }; |
| 184 | |
| 185 | /* Coefficient buffer control */ |
| 186 | struct jpeg_d_coef_controller { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 187 | void (*start_input_pass) (j_decompress_ptr cinfo); |
| 188 | int (*consume_data) (j_decompress_ptr cinfo); |
| 189 | void (*start_output_pass) (j_decompress_ptr cinfo); |
| 190 | int (*decompress_data) (j_decompress_ptr cinfo, JSAMPIMAGE output_buf); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 191 | /* Pointer to array of coefficient virtual arrays, or NULL if none */ |
| 192 | jvirt_barray_ptr *coef_arrays; |
| 193 | }; |
| 194 | |
| 195 | /* Decompression postprocessing (color quantization buffer control) */ |
| 196 | struct jpeg_d_post_controller { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 197 | void (*start_pass) (j_decompress_ptr cinfo, J_BUF_MODE pass_mode); |
| 198 | void (*post_process_data) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf, |
| 199 | JDIMENSION *in_row_group_ctr, |
| 200 | JDIMENSION in_row_groups_avail, |
| 201 | JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, |
| 202 | JDIMENSION out_rows_avail); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 203 | }; |
| 204 | |
| 205 | /* Marker reading & parsing */ |
| 206 | struct jpeg_marker_reader { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 207 | void (*reset_marker_reader) (j_decompress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 208 | /* Read markers until SOS or EOI. |
| 209 | * Returns same codes as are defined for jpeg_consume_input: |
| 210 | * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI. |
| 211 | */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 212 | int (*read_markers) (j_decompress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 213 | /* Read a restart marker --- exported for use by entropy decoder only */ |
| 214 | jpeg_marker_parser_method read_restart_marker; |
| 215 | |
| 216 | /* State of marker reader --- nominally internal, but applications |
| 217 | * supplying COM or APPn handlers might like to know the state. |
| 218 | */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 219 | boolean saw_SOI; /* found SOI? */ |
| 220 | boolean saw_SOF; /* found SOF? */ |
| 221 | int next_restart_num; /* next restart number expected (0-7) */ |
| 222 | unsigned int discarded_bytes; /* # of bytes skipped looking for a marker */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 223 | }; |
| 224 | |
| 225 | /* Entropy decoding */ |
| 226 | struct jpeg_entropy_decoder { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 227 | void (*start_pass) (j_decompress_ptr cinfo); |
| 228 | boolean (*decode_mcu) (j_decompress_ptr cinfo, JBLOCKROW *MCU_data); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 229 | |
| 230 | /* This is here to share code between baseline and progressive decoders; */ |
| 231 | /* other modules probably should not use it */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 232 | boolean insufficient_data; /* set TRUE after emitting warning */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 233 | }; |
| 234 | |
| 235 | /* Inverse DCT (also performs dequantization) */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 236 | typedef void (*inverse_DCT_method_ptr) (j_decompress_ptr cinfo, |
| 237 | jpeg_component_info *compptr, |
| 238 | JCOEFPTR coef_block, |
| 239 | JSAMPARRAY output_buf, |
| 240 | JDIMENSION output_col); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 241 | |
| 242 | struct jpeg_inverse_dct { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 243 | void (*start_pass) (j_decompress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 244 | /* It is useful to allow each component to have a separate IDCT method. */ |
| 245 | inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS]; |
| 246 | }; |
| 247 | |
| 248 | /* Upsampling (note that upsampler must also call color converter) */ |
| 249 | struct jpeg_upsampler { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 250 | void (*start_pass) (j_decompress_ptr cinfo); |
| 251 | void (*upsample) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf, |
| 252 | JDIMENSION *in_row_group_ctr, |
| 253 | JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf, |
| 254 | JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 255 | |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 256 | boolean need_context_rows; /* TRUE if need rows above & below */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 257 | }; |
| 258 | |
| 259 | /* Colorspace conversion */ |
| 260 | struct jpeg_color_deconverter { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 261 | void (*start_pass) (j_decompress_ptr cinfo); |
| 262 | void (*color_convert) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf, |
| 263 | JDIMENSION input_row, JSAMPARRAY output_buf, |
| 264 | int num_rows); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 265 | }; |
| 266 | |
| 267 | /* Color quantization or color precision reduction */ |
| 268 | struct jpeg_color_quantizer { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 269 | void (*start_pass) (j_decompress_ptr cinfo, boolean is_pre_scan); |
| 270 | void (*color_quantize) (j_decompress_ptr cinfo, JSAMPARRAY input_buf, |
| 271 | JSAMPARRAY output_buf, int num_rows); |
| 272 | void (*finish_pass) (j_decompress_ptr cinfo); |
| 273 | void (*new_color_map) (j_decompress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 274 | }; |
| 275 | |
| 276 | |
| 277 | /* Miscellaneous useful macros */ |
| 278 | |
| 279 | #undef MAX |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 280 | #define MAX(a, b) ((a) > (b) ? (a) : (b)) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 281 | #undef MIN |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 282 | #define MIN(a, b) ((a) < (b) ? (a) : (b)) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 283 | |
| 284 | |
| 285 | /* We assume that right shift corresponds to signed division by 2 with |
| 286 | * rounding towards minus infinity. This is correct for typical "arithmetic |
| 287 | * shift" instructions that shift in copies of the sign bit. But some |
| 288 | * C compilers implement >> with an unsigned shift. For these machines you |
| 289 | * must define RIGHT_SHIFT_IS_UNSIGNED. |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 290 | * RIGHT_SHIFT provides a proper signed right shift of a JLONG quantity. |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 291 | * It is only applied with constant shift counts. SHIFT_TEMPS must be |
| 292 | * included in the variables of any routine using RIGHT_SHIFT. |
| 293 | */ |
| 294 | |
| 295 | #ifdef RIGHT_SHIFT_IS_UNSIGNED |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 296 | #define SHIFT_TEMPS JLONG shift_temp; |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 297 | #define RIGHT_SHIFT(x, shft) \ |
| 298 | ((shift_temp = (x)) < 0 ? \ |
| 299 | (shift_temp >> (shft)) | ((~((JLONG)0)) << (32 - (shft))) : \ |
| 300 | (shift_temp >> (shft))) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 301 | #else |
| 302 | #define SHIFT_TEMPS |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 303 | #define RIGHT_SHIFT(x, shft) ((x) >> (shft)) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 304 | #endif |
| 305 | |
| 306 | |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 307 | /* Compression module initialization routines */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 308 | EXTERN(void) jinit_compress_master(j_compress_ptr cinfo); |
| 309 | EXTERN(void) jinit_c_master_control(j_compress_ptr cinfo, |
| 310 | boolean transcode_only); |
| 311 | EXTERN(void) jinit_c_main_controller(j_compress_ptr cinfo, |
| 312 | boolean need_full_buffer); |
| 313 | EXTERN(void) jinit_c_prep_controller(j_compress_ptr cinfo, |
| 314 | boolean need_full_buffer); |
| 315 | EXTERN(void) jinit_c_coef_controller(j_compress_ptr cinfo, |
| 316 | boolean need_full_buffer); |
| 317 | EXTERN(void) jinit_color_converter(j_compress_ptr cinfo); |
| 318 | EXTERN(void) jinit_downsampler(j_compress_ptr cinfo); |
| 319 | EXTERN(void) jinit_forward_dct(j_compress_ptr cinfo); |
| 320 | EXTERN(void) jinit_huff_encoder(j_compress_ptr cinfo); |
| 321 | EXTERN(void) jinit_phuff_encoder(j_compress_ptr cinfo); |
| 322 | EXTERN(void) jinit_arith_encoder(j_compress_ptr cinfo); |
| 323 | EXTERN(void) jinit_marker_writer(j_compress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 324 | /* Decompression module initialization routines */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 325 | EXTERN(void) jinit_master_decompress(j_decompress_ptr cinfo); |
| 326 | EXTERN(void) jinit_d_main_controller(j_decompress_ptr cinfo, |
| 327 | boolean need_full_buffer); |
| 328 | EXTERN(void) jinit_d_coef_controller(j_decompress_ptr cinfo, |
| 329 | boolean need_full_buffer); |
| 330 | EXTERN(void) jinit_d_post_controller(j_decompress_ptr cinfo, |
| 331 | boolean need_full_buffer); |
| 332 | EXTERN(void) jinit_input_controller(j_decompress_ptr cinfo); |
| 333 | EXTERN(void) jinit_marker_reader(j_decompress_ptr cinfo); |
| 334 | EXTERN(void) jinit_huff_decoder(j_decompress_ptr cinfo); |
| 335 | EXTERN(void) jinit_phuff_decoder(j_decompress_ptr cinfo); |
| 336 | EXTERN(void) jinit_arith_decoder(j_decompress_ptr cinfo); |
| 337 | EXTERN(void) jinit_inverse_dct(j_decompress_ptr cinfo); |
| 338 | EXTERN(void) jinit_upsampler(j_decompress_ptr cinfo); |
| 339 | EXTERN(void) jinit_color_deconverter(j_decompress_ptr cinfo); |
| 340 | EXTERN(void) jinit_1pass_quantizer(j_decompress_ptr cinfo); |
| 341 | EXTERN(void) jinit_2pass_quantizer(j_decompress_ptr cinfo); |
| 342 | EXTERN(void) jinit_merged_upsampler(j_decompress_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 343 | /* Memory manager initialization */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 344 | EXTERN(void) jinit_memory_mgr(j_common_ptr cinfo); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 345 | |
| 346 | /* Utility routines in jutils.c */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 347 | EXTERN(long) jdiv_round_up(long a, long b); |
| 348 | EXTERN(long) jround_up(long a, long b); |
| 349 | EXTERN(void) jcopy_sample_rows(JSAMPARRAY input_array, int source_row, |
| 350 | JSAMPARRAY output_array, int dest_row, |
| 351 | int num_rows, JDIMENSION num_cols); |
| 352 | EXTERN(void) jcopy_block_row(JBLOCKROW input_row, JBLOCKROW output_row, |
| 353 | JDIMENSION num_blocks); |
| 354 | EXTERN(void) jzero_far(void *target, size_t bytestozero); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 355 | /* Constant tables in jutils.c */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 356 | #if 0 /* This table is not actually needed in v6a */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 357 | extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */ |
| 358 | #endif |
| 359 | extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */ |
| 360 | |
hbono@chromium.org | 9862697 | 2011-08-03 03:13:08 +0000 | [diff] [blame] | 361 | /* Arithmetic coding probability estimation tables in jaricom.c */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 362 | extern const JLONG jpeg_aritab[]; |
hbono@chromium.org | 9862697 | 2011-08-03 03:13:08 +0000 | [diff] [blame] | 363 | |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 364 | /* Suppress undefined-structure complaints if necessary. */ |
| 365 | |
| 366 | #ifdef INCOMPLETE_TYPES_BROKEN |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 367 | #ifndef AM_MEMORY_MANAGER /* only jmemmgr.c defines these */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 368 | struct jvirt_sarray_control { long dummy; }; |
| 369 | struct jvirt_barray_control { long dummy; }; |
| 370 | #endif |
| 371 | #endif /* INCOMPLETE_TYPES_BROKEN */ |