Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * rdbmp.c |
| 3 | * |
DRC | cf763c0 | 2013-01-01 09:51:37 +0000 | [diff] [blame] | 4 | * This file was part of the Independent JPEG Group's software: |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 5 | * Copyright (C) 1994-1996, Thomas G. Lane. |
Guido Vollbeding | f18f81b | 2010-02-28 00:00:00 +0000 | [diff] [blame] | 6 | * Modified 2009-2010 by Guido Vollbeding. |
DRC | a6ef282 | 2013-09-28 03:23:49 +0000 | [diff] [blame] | 7 | * libjpeg-turbo Modifications: |
DRC | 049aef5 | 2011-04-25 22:41:14 +0000 | [diff] [blame] | 8 | * Modified 2011 by Siarhei Siamashka. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 9 | * For conditions of distribution and use, see the accompanying README file. |
| 10 | * |
| 11 | * This file contains routines to read input images in Microsoft "BMP" |
| 12 | * format (MS Windows 3.x, OS/2 1.x, and OS/2 2.x flavors). |
| 13 | * Currently, only 8-bit and 24-bit images are supported, not 1-bit or |
| 14 | * 4-bit (feeding such low-depth images into JPEG would be silly anyway). |
| 15 | * Also, we don't support RLE-compressed files. |
| 16 | * |
| 17 | * These routines may need modification for non-Unix environments or |
| 18 | * specialized applications. As they stand, they assume input from |
| 19 | * an ordinary stdio stream. They further assume that reading begins |
| 20 | * at the start of the file; start_input may need work if the |
| 21 | * user interface has already read some data (e.g., to determine that |
| 22 | * the file is indeed BMP format). |
| 23 | * |
| 24 | * This code contributed by James Arthur Boucher. |
| 25 | */ |
| 26 | |
| 27 | #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
| 28 | |
| 29 | #ifdef BMP_SUPPORTED |
| 30 | |
| 31 | |
| 32 | /* Macros to deal with unsigned chars as efficiently as compiler allows */ |
| 33 | |
| 34 | #ifdef HAVE_UNSIGNED_CHAR |
| 35 | typedef unsigned char U_CHAR; |
| 36 | #define UCH(x) ((int) (x)) |
| 37 | #else /* !HAVE_UNSIGNED_CHAR */ |
DRC | 61976bd | 2014-04-20 19:13:10 +0000 | [diff] [blame] | 38 | #ifdef __CHAR_UNSIGNED__ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 39 | typedef char U_CHAR; |
| 40 | #define UCH(x) ((int) (x)) |
| 41 | #else |
| 42 | typedef char U_CHAR; |
| 43 | #define UCH(x) ((int) (x) & 0xFF) |
| 44 | #endif |
| 45 | #endif /* HAVE_UNSIGNED_CHAR */ |
| 46 | |
| 47 | |
| 48 | #define ReadOK(file,buffer,len) (JFREAD(file,buffer,len) == ((size_t) (len))) |
| 49 | |
| 50 | |
| 51 | /* Private version of data source object */ |
| 52 | |
| 53 | typedef struct _bmp_source_struct * bmp_source_ptr; |
| 54 | |
| 55 | typedef struct _bmp_source_struct { |
| 56 | struct cjpeg_source_struct pub; /* public fields */ |
| 57 | |
| 58 | j_compress_ptr cinfo; /* back link saves passing separate parm */ |
| 59 | |
| 60 | JSAMPARRAY colormap; /* BMP colormap (converted to my format) */ |
| 61 | |
| 62 | jvirt_sarray_ptr whole_image; /* Needed to reverse row order */ |
| 63 | JDIMENSION source_row; /* Current source row number */ |
| 64 | JDIMENSION row_width; /* Physical width of scanlines in file */ |
| 65 | |
| 66 | int bits_per_pixel; /* remembers 8- or 24-bit format */ |
| 67 | } bmp_source_struct; |
| 68 | |
| 69 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 70 | LOCAL(int) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 71 | read_byte (bmp_source_ptr sinfo) |
| 72 | /* Read next byte from BMP file */ |
| 73 | { |
| 74 | register FILE *infile = sinfo->pub.input_file; |
| 75 | register int c; |
| 76 | |
| 77 | if ((c = getc(infile)) == EOF) |
| 78 | ERREXIT(sinfo->cinfo, JERR_INPUT_EOF); |
| 79 | return c; |
| 80 | } |
| 81 | |
| 82 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 83 | LOCAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 84 | read_colormap (bmp_source_ptr sinfo, int cmaplen, int mapentrysize) |
| 85 | /* Read the colormap from a BMP file */ |
| 86 | { |
| 87 | int i; |
| 88 | |
| 89 | switch (mapentrysize) { |
| 90 | case 3: |
| 91 | /* BGR format (occurs in OS/2 files) */ |
| 92 | for (i = 0; i < cmaplen; i++) { |
| 93 | sinfo->colormap[2][i] = (JSAMPLE) read_byte(sinfo); |
| 94 | sinfo->colormap[1][i] = (JSAMPLE) read_byte(sinfo); |
| 95 | sinfo->colormap[0][i] = (JSAMPLE) read_byte(sinfo); |
| 96 | } |
| 97 | break; |
| 98 | case 4: |
| 99 | /* BGR0 format (occurs in MS Windows files) */ |
| 100 | for (i = 0; i < cmaplen; i++) { |
| 101 | sinfo->colormap[2][i] = (JSAMPLE) read_byte(sinfo); |
| 102 | sinfo->colormap[1][i] = (JSAMPLE) read_byte(sinfo); |
| 103 | sinfo->colormap[0][i] = (JSAMPLE) read_byte(sinfo); |
| 104 | (void) read_byte(sinfo); |
| 105 | } |
| 106 | break; |
| 107 | default: |
| 108 | ERREXIT(sinfo->cinfo, JERR_BMP_BADCMAP); |
| 109 | break; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | |
| 114 | /* |
| 115 | * Read one row of pixels. |
| 116 | * The image has been read into the whole_image array, but is otherwise |
| 117 | * unprocessed. We must read it out in top-to-bottom row order, and if |
| 118 | * it is an 8-bit image, we must expand colormapped pixels to 24bit format. |
| 119 | */ |
| 120 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 121 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 122 | get_8bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 123 | /* This version is for reading 8-bit colormap indexes */ |
| 124 | { |
| 125 | bmp_source_ptr source = (bmp_source_ptr) sinfo; |
| 126 | register JSAMPARRAY colormap = source->colormap; |
| 127 | JSAMPARRAY image_ptr; |
| 128 | register int t; |
| 129 | register JSAMPROW inptr, outptr; |
| 130 | register JDIMENSION col; |
| 131 | |
| 132 | /* Fetch next row from virtual array */ |
| 133 | source->source_row--; |
| 134 | image_ptr = (*cinfo->mem->access_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 135 | ((j_common_ptr) cinfo, source->whole_image, |
| 136 | source->source_row, (JDIMENSION) 1, FALSE); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 137 | |
| 138 | /* Expand the colormap indexes to real data */ |
| 139 | inptr = image_ptr[0]; |
| 140 | outptr = source->pub.buffer[0]; |
| 141 | for (col = cinfo->image_width; col > 0; col--) { |
| 142 | t = GETJSAMPLE(*inptr++); |
| 143 | *outptr++ = colormap[0][t]; /* can omit GETJSAMPLE() safely */ |
| 144 | *outptr++ = colormap[1][t]; |
| 145 | *outptr++ = colormap[2][t]; |
| 146 | } |
| 147 | |
| 148 | return 1; |
| 149 | } |
| 150 | |
| 151 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 152 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 153 | get_24bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 154 | /* This version is for reading 24-bit pixels */ |
| 155 | { |
| 156 | bmp_source_ptr source = (bmp_source_ptr) sinfo; |
| 157 | JSAMPARRAY image_ptr; |
| 158 | register JSAMPROW inptr, outptr; |
| 159 | register JDIMENSION col; |
| 160 | |
| 161 | /* Fetch next row from virtual array */ |
| 162 | source->source_row--; |
| 163 | image_ptr = (*cinfo->mem->access_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 164 | ((j_common_ptr) cinfo, source->whole_image, |
| 165 | source->source_row, (JDIMENSION) 1, FALSE); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 166 | |
| 167 | /* Transfer data. Note source values are in BGR order |
| 168 | * (even though Microsoft's own documents say the opposite). |
| 169 | */ |
| 170 | inptr = image_ptr[0]; |
| 171 | outptr = source->pub.buffer[0]; |
| 172 | for (col = cinfo->image_width; col > 0; col--) { |
| 173 | outptr[2] = *inptr++; /* can omit GETJSAMPLE() safely */ |
| 174 | outptr[1] = *inptr++; |
| 175 | outptr[0] = *inptr++; |
| 176 | outptr += 3; |
| 177 | } |
| 178 | |
| 179 | return 1; |
| 180 | } |
| 181 | |
| 182 | |
Guido Vollbeding | f18f81b | 2010-02-28 00:00:00 +0000 | [diff] [blame] | 183 | METHODDEF(JDIMENSION) |
| 184 | get_32bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 185 | /* This version is for reading 32-bit pixels */ |
| 186 | { |
| 187 | bmp_source_ptr source = (bmp_source_ptr) sinfo; |
| 188 | JSAMPARRAY image_ptr; |
| 189 | register JSAMPROW inptr, outptr; |
| 190 | register JDIMENSION col; |
| 191 | |
| 192 | /* Fetch next row from virtual array */ |
| 193 | source->source_row--; |
| 194 | image_ptr = (*cinfo->mem->access_virt_sarray) |
| 195 | ((j_common_ptr) cinfo, source->whole_image, |
| 196 | source->source_row, (JDIMENSION) 1, FALSE); |
| 197 | /* Transfer data. Note source values are in BGR order |
| 198 | * (even though Microsoft's own documents say the opposite). |
| 199 | */ |
| 200 | inptr = image_ptr[0]; |
| 201 | outptr = source->pub.buffer[0]; |
| 202 | for (col = cinfo->image_width; col > 0; col--) { |
| 203 | outptr[2] = *inptr++; /* can omit GETJSAMPLE() safely */ |
| 204 | outptr[1] = *inptr++; |
| 205 | outptr[0] = *inptr++; |
| 206 | inptr++; /* skip the 4th byte (Alpha channel) */ |
| 207 | outptr += 3; |
| 208 | } |
| 209 | |
| 210 | return 1; |
| 211 | } |
| 212 | |
| 213 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 214 | /* |
| 215 | * This method loads the image into whole_image during the first call on |
| 216 | * get_pixel_rows. The get_pixel_rows pointer is then adjusted to call |
Guido Vollbeding | f18f81b | 2010-02-28 00:00:00 +0000 | [diff] [blame] | 217 | * get_8bit_row, get_24bit_row, or get_32bit_row on subsequent calls. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 218 | */ |
| 219 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 220 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 221 | preload_image (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 222 | { |
| 223 | bmp_source_ptr source = (bmp_source_ptr) sinfo; |
| 224 | register FILE *infile = source->pub.input_file; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 225 | register JSAMPROW out_ptr; |
| 226 | JSAMPARRAY image_ptr; |
DRC | 049aef5 | 2011-04-25 22:41:14 +0000 | [diff] [blame] | 227 | JDIMENSION row; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 228 | cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
| 229 | |
| 230 | /* Read the data into a virtual array in input-file row order. */ |
| 231 | for (row = 0; row < cinfo->image_height; row++) { |
| 232 | if (progress != NULL) { |
| 233 | progress->pub.pass_counter = (long) row; |
| 234 | progress->pub.pass_limit = (long) cinfo->image_height; |
| 235 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
| 236 | } |
| 237 | image_ptr = (*cinfo->mem->access_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 238 | ((j_common_ptr) cinfo, source->whole_image, |
| 239 | row, (JDIMENSION) 1, TRUE); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 240 | out_ptr = image_ptr[0]; |
DRC | 049aef5 | 2011-04-25 22:41:14 +0000 | [diff] [blame] | 241 | if (fread(out_ptr, 1, source->row_width, infile) != source->row_width) { |
| 242 | if (feof(infile)) |
| 243 | ERREXIT(cinfo, JERR_INPUT_EOF); |
| 244 | else |
| 245 | ERREXIT(cinfo, JERR_FILE_READ); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 246 | } |
| 247 | } |
| 248 | if (progress != NULL) |
| 249 | progress->completed_extra_passes++; |
| 250 | |
| 251 | /* Set up to read from the virtual array in top-to-bottom order */ |
| 252 | switch (source->bits_per_pixel) { |
| 253 | case 8: |
| 254 | source->pub.get_pixel_rows = get_8bit_row; |
| 255 | break; |
| 256 | case 24: |
| 257 | source->pub.get_pixel_rows = get_24bit_row; |
| 258 | break; |
Guido Vollbeding | f18f81b | 2010-02-28 00:00:00 +0000 | [diff] [blame] | 259 | case 32: |
| 260 | source->pub.get_pixel_rows = get_32bit_row; |
| 261 | break; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 262 | default: |
| 263 | ERREXIT(cinfo, JERR_BMP_BADDEPTH); |
| 264 | } |
| 265 | source->source_row = cinfo->image_height; |
| 266 | |
| 267 | /* And read the first row */ |
| 268 | return (*source->pub.get_pixel_rows) (cinfo, sinfo); |
| 269 | } |
| 270 | |
| 271 | |
| 272 | /* |
| 273 | * Read the file header; return image size and component count. |
| 274 | */ |
| 275 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 276 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 277 | start_input_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 278 | { |
| 279 | bmp_source_ptr source = (bmp_source_ptr) sinfo; |
| 280 | U_CHAR bmpfileheader[14]; |
| 281 | U_CHAR bmpinfoheader[64]; |
| 282 | #define GET_2B(array,offset) ((unsigned int) UCH(array[offset]) + \ |
| 283 | (((unsigned int) UCH(array[offset+1])) << 8)) |
| 284 | #define GET_4B(array,offset) ((INT32) UCH(array[offset]) + \ |
| 285 | (((INT32) UCH(array[offset+1])) << 8) + \ |
| 286 | (((INT32) UCH(array[offset+2])) << 16) + \ |
| 287 | (((INT32) UCH(array[offset+3])) << 24)) |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 288 | INT32 bfOffBits; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 289 | INT32 headerSize; |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 290 | INT32 biWidth; |
| 291 | INT32 biHeight; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 292 | unsigned int biPlanes; |
| 293 | INT32 biCompression; |
| 294 | INT32 biXPelsPerMeter,biYPelsPerMeter; |
| 295 | INT32 biClrUsed = 0; |
| 296 | int mapentrysize = 0; /* 0 indicates no colormap */ |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 297 | INT32 bPad; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 298 | JDIMENSION row_width; |
| 299 | |
| 300 | /* Read and verify the bitmap file header */ |
| 301 | if (! ReadOK(source->pub.input_file, bmpfileheader, 14)) |
| 302 | ERREXIT(cinfo, JERR_INPUT_EOF); |
| 303 | if (GET_2B(bmpfileheader,0) != 0x4D42) /* 'BM' */ |
| 304 | ERREXIT(cinfo, JERR_BMP_NOT); |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 305 | bfOffBits = (INT32) GET_4B(bmpfileheader,10); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 306 | /* We ignore the remaining fileheader fields */ |
| 307 | |
| 308 | /* The infoheader might be 12 bytes (OS/2 1.x), 40 bytes (Windows), |
| 309 | * or 64 bytes (OS/2 2.x). Check the first 4 bytes to find out which. |
| 310 | */ |
| 311 | if (! ReadOK(source->pub.input_file, bmpinfoheader, 4)) |
| 312 | ERREXIT(cinfo, JERR_INPUT_EOF); |
| 313 | headerSize = (INT32) GET_4B(bmpinfoheader,0); |
| 314 | if (headerSize < 12 || headerSize > 64) |
| 315 | ERREXIT(cinfo, JERR_BMP_BADHEADER); |
| 316 | if (! ReadOK(source->pub.input_file, bmpinfoheader+4, headerSize-4)) |
| 317 | ERREXIT(cinfo, JERR_INPUT_EOF); |
| 318 | |
| 319 | switch ((int) headerSize) { |
| 320 | case 12: |
| 321 | /* Decode OS/2 1.x header (Microsoft calls this a BITMAPCOREHEADER) */ |
| 322 | biWidth = (INT32) GET_2B(bmpinfoheader,4); |
| 323 | biHeight = (INT32) GET_2B(bmpinfoheader,6); |
| 324 | biPlanes = GET_2B(bmpinfoheader,8); |
| 325 | source->bits_per_pixel = (int) GET_2B(bmpinfoheader,10); |
| 326 | |
| 327 | switch (source->bits_per_pixel) { |
| 328 | case 8: /* colormapped image */ |
| 329 | mapentrysize = 3; /* OS/2 uses RGBTRIPLE colormap */ |
| 330 | TRACEMS2(cinfo, 1, JTRC_BMP_OS2_MAPPED, (int) biWidth, (int) biHeight); |
| 331 | break; |
| 332 | case 24: /* RGB image */ |
| 333 | TRACEMS2(cinfo, 1, JTRC_BMP_OS2, (int) biWidth, (int) biHeight); |
| 334 | break; |
| 335 | default: |
| 336 | ERREXIT(cinfo, JERR_BMP_BADDEPTH); |
| 337 | break; |
| 338 | } |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 339 | break; |
| 340 | case 40: |
| 341 | case 64: |
| 342 | /* Decode Windows 3.x header (Microsoft calls this a BITMAPINFOHEADER) */ |
| 343 | /* or OS/2 2.x header, which has additional fields that we ignore */ |
| 344 | biWidth = GET_4B(bmpinfoheader,4); |
| 345 | biHeight = GET_4B(bmpinfoheader,8); |
| 346 | biPlanes = GET_2B(bmpinfoheader,12); |
| 347 | source->bits_per_pixel = (int) GET_2B(bmpinfoheader,14); |
| 348 | biCompression = GET_4B(bmpinfoheader,16); |
| 349 | biXPelsPerMeter = GET_4B(bmpinfoheader,24); |
| 350 | biYPelsPerMeter = GET_4B(bmpinfoheader,28); |
| 351 | biClrUsed = GET_4B(bmpinfoheader,32); |
| 352 | /* biSizeImage, biClrImportant fields are ignored */ |
| 353 | |
| 354 | switch (source->bits_per_pixel) { |
| 355 | case 8: /* colormapped image */ |
| 356 | mapentrysize = 4; /* Windows uses RGBQUAD colormap */ |
| 357 | TRACEMS2(cinfo, 1, JTRC_BMP_MAPPED, (int) biWidth, (int) biHeight); |
| 358 | break; |
| 359 | case 24: /* RGB image */ |
| 360 | TRACEMS2(cinfo, 1, JTRC_BMP, (int) biWidth, (int) biHeight); |
| 361 | break; |
Guido Vollbeding | f18f81b | 2010-02-28 00:00:00 +0000 | [diff] [blame] | 362 | case 32: /* RGB image + Alpha channel */ |
| 363 | TRACEMS2(cinfo, 1, JTRC_BMP, (int) biWidth, (int) biHeight); |
| 364 | break; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 365 | default: |
| 366 | ERREXIT(cinfo, JERR_BMP_BADDEPTH); |
| 367 | break; |
| 368 | } |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 369 | if (biCompression != 0) |
| 370 | ERREXIT(cinfo, JERR_BMP_COMPRESSED); |
| 371 | |
| 372 | if (biXPelsPerMeter > 0 && biYPelsPerMeter > 0) { |
| 373 | /* Set JFIF density parameters from the BMP data */ |
| 374 | cinfo->X_density = (UINT16) (biXPelsPerMeter/100); /* 100 cm per meter */ |
| 375 | cinfo->Y_density = (UINT16) (biYPelsPerMeter/100); |
| 376 | cinfo->density_unit = 2; /* dots/cm */ |
| 377 | } |
| 378 | break; |
| 379 | default: |
| 380 | ERREXIT(cinfo, JERR_BMP_BADHEADER); |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 381 | return; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 382 | } |
| 383 | |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 384 | if (biWidth <= 0 || biHeight <= 0) |
| 385 | ERREXIT(cinfo, JERR_BMP_EMPTY); |
| 386 | if (biPlanes != 1) |
| 387 | ERREXIT(cinfo, JERR_BMP_BADPLANES); |
| 388 | |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 389 | /* Compute distance to bitmap data --- will adjust for colormap below */ |
| 390 | bPad = bfOffBits - (headerSize + 14); |
| 391 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 392 | /* Read the colormap, if any */ |
| 393 | if (mapentrysize > 0) { |
| 394 | if (biClrUsed <= 0) |
| 395 | biClrUsed = 256; /* assume it's 256 */ |
| 396 | else if (biClrUsed > 256) |
| 397 | ERREXIT(cinfo, JERR_BMP_BADCMAP); |
| 398 | /* Allocate space to store the colormap */ |
| 399 | source->colormap = (*cinfo->mem->alloc_sarray) |
| 400 | ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 401 | (JDIMENSION) biClrUsed, (JDIMENSION) 3); |
| 402 | /* and read it from the file */ |
| 403 | read_colormap(source, (int) biClrUsed, mapentrysize); |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 404 | /* account for size of colormap */ |
| 405 | bPad -= biClrUsed * mapentrysize; |
| 406 | } |
| 407 | |
| 408 | /* Skip any remaining pad bytes */ |
| 409 | if (bPad < 0) /* incorrect bfOffBits value? */ |
| 410 | ERREXIT(cinfo, JERR_BMP_BADHEADER); |
| 411 | while (--bPad >= 0) { |
| 412 | (void) read_byte(source); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | /* Compute row width in file, including padding to 4-byte boundary */ |
| 416 | if (source->bits_per_pixel == 24) |
| 417 | row_width = (JDIMENSION) (biWidth * 3); |
Guido Vollbeding | f18f81b | 2010-02-28 00:00:00 +0000 | [diff] [blame] | 418 | else if (source->bits_per_pixel == 32) |
| 419 | row_width = (JDIMENSION) (biWidth * 4); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 420 | else |
| 421 | row_width = (JDIMENSION) biWidth; |
| 422 | while ((row_width & 3) != 0) row_width++; |
| 423 | source->row_width = row_width; |
| 424 | |
| 425 | /* Allocate space for inversion array, prepare for preload pass */ |
| 426 | source->whole_image = (*cinfo->mem->request_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 427 | ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 428 | row_width, (JDIMENSION) biHeight, (JDIMENSION) 1); |
| 429 | source->pub.get_pixel_rows = preload_image; |
| 430 | if (cinfo->progress != NULL) { |
| 431 | cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
| 432 | progress->total_extra_passes++; /* count file input as separate pass */ |
| 433 | } |
| 434 | |
| 435 | /* Allocate one-row buffer for returned data */ |
| 436 | source->pub.buffer = (*cinfo->mem->alloc_sarray) |
| 437 | ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 438 | (JDIMENSION) (biWidth * 3), (JDIMENSION) 1); |
| 439 | source->pub.buffer_height = 1; |
| 440 | |
| 441 | cinfo->in_color_space = JCS_RGB; |
| 442 | cinfo->input_components = 3; |
| 443 | cinfo->data_precision = 8; |
| 444 | cinfo->image_width = (JDIMENSION) biWidth; |
| 445 | cinfo->image_height = (JDIMENSION) biHeight; |
| 446 | } |
| 447 | |
| 448 | |
| 449 | /* |
| 450 | * Finish up at the end of the file. |
| 451 | */ |
| 452 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 453 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 454 | finish_input_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 455 | { |
| 456 | /* no work */ |
| 457 | } |
| 458 | |
| 459 | |
| 460 | /* |
| 461 | * The module selection routine for BMP format input. |
| 462 | */ |
| 463 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 464 | GLOBAL(cjpeg_source_ptr) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 465 | jinit_read_bmp (j_compress_ptr cinfo) |
| 466 | { |
| 467 | bmp_source_ptr source; |
| 468 | |
| 469 | /* Create module interface object */ |
| 470 | source = (bmp_source_ptr) |
| 471 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 472 | SIZEOF(bmp_source_struct)); |
| 473 | source->cinfo = cinfo; /* make back link for subroutines */ |
| 474 | /* Fill in method ptrs, except get_pixel_rows which start_input sets */ |
| 475 | source->pub.start_input = start_input_bmp; |
| 476 | source->pub.finish_input = finish_input_bmp; |
| 477 | |
| 478 | return (cjpeg_source_ptr) source; |
| 479 | } |
| 480 | |
| 481 | #endif /* BMP_SUPPORTED */ |