Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * rdtarga.c |
| 3 | * |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 4 | * Copyright (C) 1991-1996, Thomas G. Lane. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 5 | * This file is part of the Independent JPEG Group's software. |
| 6 | * For conditions of distribution and use, see the accompanying README file. |
| 7 | * |
| 8 | * This file contains routines to read input images in Targa format. |
| 9 | * |
| 10 | * These routines may need modification for non-Unix environments or |
| 11 | * specialized applications. As they stand, they assume input from |
| 12 | * an ordinary stdio stream. They further assume that reading begins |
| 13 | * at the start of the file; start_input may need work if the |
| 14 | * user interface has already read some data (e.g., to determine that |
| 15 | * the file is indeed Targa format). |
| 16 | * |
| 17 | * Based on code contributed by Lee Daniel Crocker. |
| 18 | */ |
| 19 | |
| 20 | #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
| 21 | |
| 22 | #ifdef TARGA_SUPPORTED |
| 23 | |
| 24 | |
| 25 | /* Macros to deal with unsigned chars as efficiently as compiler allows */ |
| 26 | |
| 27 | #ifdef HAVE_UNSIGNED_CHAR |
| 28 | typedef unsigned char U_CHAR; |
| 29 | #define UCH(x) ((int) (x)) |
| 30 | #else /* !HAVE_UNSIGNED_CHAR */ |
DRC | 61976bd | 2014-04-20 19:13:10 +0000 | [diff] [blame^] | 31 | #ifdef __CHAR_UNSIGNED__ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 32 | typedef char U_CHAR; |
| 33 | #define UCH(x) ((int) (x)) |
| 34 | #else |
| 35 | typedef char U_CHAR; |
| 36 | #define UCH(x) ((int) (x) & 0xFF) |
| 37 | #endif |
| 38 | #endif /* HAVE_UNSIGNED_CHAR */ |
| 39 | |
| 40 | |
| 41 | #define ReadOK(file,buffer,len) (JFREAD(file,buffer,len) == ((size_t) (len))) |
| 42 | |
| 43 | |
| 44 | /* Private version of data source object */ |
| 45 | |
| 46 | typedef struct _tga_source_struct * tga_source_ptr; |
| 47 | |
| 48 | typedef struct _tga_source_struct { |
| 49 | struct cjpeg_source_struct pub; /* public fields */ |
| 50 | |
| 51 | j_compress_ptr cinfo; /* back link saves passing separate parm */ |
| 52 | |
| 53 | JSAMPARRAY colormap; /* Targa colormap (converted to my format) */ |
| 54 | |
| 55 | jvirt_sarray_ptr whole_image; /* Needed if funny input row order */ |
| 56 | JDIMENSION current_row; /* Current logical row number to read */ |
| 57 | |
| 58 | /* Pointer to routine to extract next Targa pixel from input file */ |
| 59 | JMETHOD(void, read_pixel, (tga_source_ptr sinfo)); |
| 60 | |
| 61 | /* Result of read_pixel is delivered here: */ |
| 62 | U_CHAR tga_pixel[4]; |
| 63 | |
| 64 | int pixel_size; /* Bytes per Targa pixel (1 to 4) */ |
| 65 | |
| 66 | /* State info for reading RLE-coded pixels; both counts must be init to 0 */ |
| 67 | int block_count; /* # of pixels remaining in RLE block */ |
| 68 | int dup_pixel_count; /* # of times to duplicate previous pixel */ |
| 69 | |
| 70 | /* This saves the correct pixel-row-expansion method for preload_image */ |
| 71 | JMETHOD(JDIMENSION, get_pixel_rows, (j_compress_ptr cinfo, |
| 72 | cjpeg_source_ptr sinfo)); |
| 73 | } tga_source_struct; |
| 74 | |
| 75 | |
| 76 | /* For expanding 5-bit pixel values to 8-bit with best rounding */ |
| 77 | |
| 78 | static const UINT8 c5to8bits[32] = { |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 79 | 0, 8, 16, 25, 33, 41, 49, 58, |
| 80 | 66, 74, 82, 90, 99, 107, 115, 123, |
| 81 | 132, 140, 148, 156, 165, 173, 181, 189, |
| 82 | 197, 206, 214, 222, 230, 239, 247, 255 |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 83 | }; |
| 84 | |
| 85 | |
| 86 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 87 | LOCAL(int) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 88 | read_byte (tga_source_ptr sinfo) |
| 89 | /* Read next byte from Targa file */ |
| 90 | { |
| 91 | register FILE *infile = sinfo->pub.input_file; |
| 92 | register int c; |
| 93 | |
| 94 | if ((c = getc(infile)) == EOF) |
| 95 | ERREXIT(sinfo->cinfo, JERR_INPUT_EOF); |
| 96 | return c; |
| 97 | } |
| 98 | |
| 99 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 100 | LOCAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 101 | read_colormap (tga_source_ptr sinfo, int cmaplen, int mapentrysize) |
| 102 | /* Read the colormap from a Targa file */ |
| 103 | { |
| 104 | int i; |
| 105 | |
| 106 | /* Presently only handles 24-bit BGR format */ |
| 107 | if (mapentrysize != 24) |
| 108 | ERREXIT(sinfo->cinfo, JERR_TGA_BADCMAP); |
| 109 | |
| 110 | for (i = 0; i < cmaplen; i++) { |
| 111 | sinfo->colormap[2][i] = (JSAMPLE) read_byte(sinfo); |
| 112 | sinfo->colormap[1][i] = (JSAMPLE) read_byte(sinfo); |
| 113 | sinfo->colormap[0][i] = (JSAMPLE) read_byte(sinfo); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | |
| 118 | /* |
| 119 | * read_pixel methods: get a single pixel from Targa file into tga_pixel[] |
| 120 | */ |
| 121 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 122 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 123 | read_non_rle_pixel (tga_source_ptr sinfo) |
| 124 | /* Read one Targa pixel from the input file; no RLE expansion */ |
| 125 | { |
| 126 | register FILE *infile = sinfo->pub.input_file; |
| 127 | register int i; |
| 128 | |
| 129 | for (i = 0; i < sinfo->pixel_size; i++) { |
| 130 | sinfo->tga_pixel[i] = (U_CHAR) getc(infile); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 135 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 136 | read_rle_pixel (tga_source_ptr sinfo) |
| 137 | /* Read one Targa pixel from the input file, expanding RLE data as needed */ |
| 138 | { |
| 139 | register FILE *infile = sinfo->pub.input_file; |
| 140 | register int i; |
| 141 | |
| 142 | /* Duplicate previously read pixel? */ |
| 143 | if (sinfo->dup_pixel_count > 0) { |
| 144 | sinfo->dup_pixel_count--; |
| 145 | return; |
| 146 | } |
| 147 | |
| 148 | /* Time to read RLE block header? */ |
| 149 | if (--sinfo->block_count < 0) { /* decrement pixels remaining in block */ |
| 150 | i = read_byte(sinfo); |
| 151 | if (i & 0x80) { /* Start of duplicate-pixel block? */ |
| 152 | sinfo->dup_pixel_count = i & 0x7F; /* number of dups after this one */ |
| 153 | sinfo->block_count = 0; /* then read new block header */ |
| 154 | } else { |
| 155 | sinfo->block_count = i & 0x7F; /* number of pixels after this one */ |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | /* Read next pixel */ |
| 160 | for (i = 0; i < sinfo->pixel_size; i++) { |
| 161 | sinfo->tga_pixel[i] = (U_CHAR) getc(infile); |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | |
| 166 | /* |
| 167 | * Read one row of pixels. |
| 168 | * |
| 169 | * We provide several different versions depending on input file format. |
| 170 | */ |
| 171 | |
| 172 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 173 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 174 | get_8bit_gray_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 175 | /* This version is for reading 8-bit grayscale pixels */ |
| 176 | { |
| 177 | tga_source_ptr source = (tga_source_ptr) sinfo; |
| 178 | register JSAMPROW ptr; |
| 179 | register JDIMENSION col; |
DRC | 61976bd | 2014-04-20 19:13:10 +0000 | [diff] [blame^] | 180 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 181 | ptr = source->pub.buffer[0]; |
| 182 | for (col = cinfo->image_width; col > 0; col--) { |
| 183 | (*source->read_pixel) (source); /* Load next pixel into tga_pixel */ |
| 184 | *ptr++ = (JSAMPLE) UCH(source->tga_pixel[0]); |
| 185 | } |
| 186 | return 1; |
| 187 | } |
| 188 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 189 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 190 | get_8bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 191 | /* This version is for reading 8-bit colormap indexes */ |
| 192 | { |
| 193 | tga_source_ptr source = (tga_source_ptr) sinfo; |
| 194 | register int t; |
| 195 | register JSAMPROW ptr; |
| 196 | register JDIMENSION col; |
| 197 | register JSAMPARRAY colormap = source->colormap; |
| 198 | |
| 199 | ptr = source->pub.buffer[0]; |
| 200 | for (col = cinfo->image_width; col > 0; col--) { |
| 201 | (*source->read_pixel) (source); /* Load next pixel into tga_pixel */ |
| 202 | t = UCH(source->tga_pixel[0]); |
| 203 | *ptr++ = colormap[0][t]; |
| 204 | *ptr++ = colormap[1][t]; |
| 205 | *ptr++ = colormap[2][t]; |
| 206 | } |
| 207 | return 1; |
| 208 | } |
| 209 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 210 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 211 | get_16bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 212 | /* This version is for reading 16-bit pixels */ |
| 213 | { |
| 214 | tga_source_ptr source = (tga_source_ptr) sinfo; |
| 215 | register int t; |
| 216 | register JSAMPROW ptr; |
| 217 | register JDIMENSION col; |
DRC | 61976bd | 2014-04-20 19:13:10 +0000 | [diff] [blame^] | 218 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 219 | ptr = source->pub.buffer[0]; |
| 220 | for (col = cinfo->image_width; col > 0; col--) { |
| 221 | (*source->read_pixel) (source); /* Load next pixel into tga_pixel */ |
| 222 | t = UCH(source->tga_pixel[0]); |
| 223 | t += UCH(source->tga_pixel[1]) << 8; |
| 224 | /* We expand 5 bit data to 8 bit sample width. |
| 225 | * The format of the 16-bit (LSB first) input word is |
| 226 | * xRRRRRGGGGGBBBBB |
| 227 | */ |
| 228 | ptr[2] = (JSAMPLE) c5to8bits[t & 0x1F]; |
| 229 | t >>= 5; |
| 230 | ptr[1] = (JSAMPLE) c5to8bits[t & 0x1F]; |
| 231 | t >>= 5; |
| 232 | ptr[0] = (JSAMPLE) c5to8bits[t & 0x1F]; |
| 233 | ptr += 3; |
| 234 | } |
| 235 | return 1; |
| 236 | } |
| 237 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 238 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 239 | get_24bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 240 | /* This version is for reading 24-bit pixels */ |
| 241 | { |
| 242 | tga_source_ptr source = (tga_source_ptr) sinfo; |
| 243 | register JSAMPROW ptr; |
| 244 | register JDIMENSION col; |
DRC | 61976bd | 2014-04-20 19:13:10 +0000 | [diff] [blame^] | 245 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 246 | ptr = source->pub.buffer[0]; |
| 247 | for (col = cinfo->image_width; col > 0; col--) { |
| 248 | (*source->read_pixel) (source); /* Load next pixel into tga_pixel */ |
| 249 | *ptr++ = (JSAMPLE) UCH(source->tga_pixel[2]); /* change BGR to RGB order */ |
| 250 | *ptr++ = (JSAMPLE) UCH(source->tga_pixel[1]); |
| 251 | *ptr++ = (JSAMPLE) UCH(source->tga_pixel[0]); |
| 252 | } |
| 253 | return 1; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * Targa also defines a 32-bit pixel format with order B,G,R,A. |
| 258 | * We presently ignore the attribute byte, so the code for reading |
| 259 | * these pixels is identical to the 24-bit routine above. |
| 260 | * This works because the actual pixel length is only known to read_pixel. |
| 261 | */ |
| 262 | |
| 263 | #define get_32bit_row get_24bit_row |
| 264 | |
| 265 | |
| 266 | /* |
| 267 | * This method is for re-reading the input data in standard top-down |
| 268 | * row order. The entire image has already been read into whole_image |
| 269 | * with proper conversion of pixel format, but it's in a funny row order. |
| 270 | */ |
| 271 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 272 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 273 | get_memory_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 274 | { |
| 275 | tga_source_ptr source = (tga_source_ptr) sinfo; |
| 276 | JDIMENSION source_row; |
| 277 | |
| 278 | /* Compute row of source that maps to current_row of normal order */ |
| 279 | /* For now, assume image is bottom-up and not interlaced. */ |
| 280 | /* NEEDS WORK to support interlaced images! */ |
| 281 | source_row = cinfo->image_height - source->current_row - 1; |
| 282 | |
| 283 | /* Fetch that row from virtual array */ |
| 284 | source->pub.buffer = (*cinfo->mem->access_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 285 | ((j_common_ptr) cinfo, source->whole_image, |
| 286 | source_row, (JDIMENSION) 1, FALSE); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 287 | |
| 288 | source->current_row++; |
| 289 | return 1; |
| 290 | } |
| 291 | |
| 292 | |
| 293 | /* |
| 294 | * This method loads the image into whole_image during the first call on |
| 295 | * get_pixel_rows. The get_pixel_rows pointer is then adjusted to call |
| 296 | * get_memory_row on subsequent calls. |
| 297 | */ |
| 298 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 299 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 300 | preload_image (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 301 | { |
| 302 | tga_source_ptr source = (tga_source_ptr) sinfo; |
| 303 | JDIMENSION row; |
| 304 | cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
| 305 | |
| 306 | /* Read the data into a virtual array in input-file row order. */ |
| 307 | for (row = 0; row < cinfo->image_height; row++) { |
| 308 | if (progress != NULL) { |
| 309 | progress->pub.pass_counter = (long) row; |
| 310 | progress->pub.pass_limit = (long) cinfo->image_height; |
| 311 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
| 312 | } |
| 313 | source->pub.buffer = (*cinfo->mem->access_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 314 | ((j_common_ptr) cinfo, source->whole_image, row, (JDIMENSION) 1, TRUE); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 315 | (*source->get_pixel_rows) (cinfo, sinfo); |
| 316 | } |
| 317 | if (progress != NULL) |
| 318 | progress->completed_extra_passes++; |
| 319 | |
| 320 | /* Set up to read from the virtual array in unscrambled order */ |
| 321 | source->pub.get_pixel_rows = get_memory_row; |
| 322 | source->current_row = 0; |
| 323 | /* And read the first row */ |
| 324 | return get_memory_row(cinfo, sinfo); |
| 325 | } |
| 326 | |
| 327 | |
| 328 | /* |
| 329 | * Read the file header; return image size and component count. |
| 330 | */ |
| 331 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 332 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 333 | start_input_tga (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 334 | { |
| 335 | tga_source_ptr source = (tga_source_ptr) sinfo; |
| 336 | U_CHAR targaheader[18]; |
| 337 | int idlen, cmaptype, subtype, flags, interlace_type, components; |
| 338 | unsigned int width, height, maplen; |
| 339 | boolean is_bottom_up; |
| 340 | |
| 341 | #define GET_2B(offset) ((unsigned int) UCH(targaheader[offset]) + \ |
| 342 | (((unsigned int) UCH(targaheader[offset+1])) << 8)) |
| 343 | |
| 344 | if (! ReadOK(source->pub.input_file, targaheader, 18)) |
| 345 | ERREXIT(cinfo, JERR_INPUT_EOF); |
| 346 | |
| 347 | /* Pretend "15-bit" pixels are 16-bit --- we ignore attribute bit anyway */ |
| 348 | if (targaheader[16] == 15) |
| 349 | targaheader[16] = 16; |
| 350 | |
| 351 | idlen = UCH(targaheader[0]); |
| 352 | cmaptype = UCH(targaheader[1]); |
| 353 | subtype = UCH(targaheader[2]); |
| 354 | maplen = GET_2B(5); |
| 355 | width = GET_2B(12); |
| 356 | height = GET_2B(14); |
| 357 | source->pixel_size = UCH(targaheader[16]) >> 3; |
| 358 | flags = UCH(targaheader[17]); /* Image Descriptor byte */ |
| 359 | |
| 360 | is_bottom_up = ((flags & 0x20) == 0); /* bit 5 set => top-down */ |
| 361 | interlace_type = flags >> 6; /* bits 6/7 are interlace code */ |
| 362 | |
| 363 | if (cmaptype > 1 || /* cmaptype must be 0 or 1 */ |
| 364 | source->pixel_size < 1 || source->pixel_size > 4 || |
| 365 | (UCH(targaheader[16]) & 7) != 0 || /* bits/pixel must be multiple of 8 */ |
| 366 | interlace_type != 0) /* currently don't allow interlaced image */ |
| 367 | ERREXIT(cinfo, JERR_TGA_BADPARMS); |
DRC | 61976bd | 2014-04-20 19:13:10 +0000 | [diff] [blame^] | 368 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 369 | if (subtype > 8) { |
| 370 | /* It's an RLE-coded file */ |
| 371 | source->read_pixel = read_rle_pixel; |
| 372 | source->block_count = source->dup_pixel_count = 0; |
| 373 | subtype -= 8; |
| 374 | } else { |
| 375 | /* Non-RLE file */ |
| 376 | source->read_pixel = read_non_rle_pixel; |
| 377 | } |
| 378 | |
| 379 | /* Now should have subtype 1, 2, or 3 */ |
| 380 | components = 3; /* until proven different */ |
| 381 | cinfo->in_color_space = JCS_RGB; |
| 382 | |
| 383 | switch (subtype) { |
| 384 | case 1: /* Colormapped image */ |
| 385 | if (source->pixel_size == 1 && cmaptype == 1) |
| 386 | source->get_pixel_rows = get_8bit_row; |
| 387 | else |
| 388 | ERREXIT(cinfo, JERR_TGA_BADPARMS); |
| 389 | TRACEMS2(cinfo, 1, JTRC_TGA_MAPPED, width, height); |
| 390 | break; |
| 391 | case 2: /* RGB image */ |
| 392 | switch (source->pixel_size) { |
| 393 | case 2: |
| 394 | source->get_pixel_rows = get_16bit_row; |
| 395 | break; |
| 396 | case 3: |
| 397 | source->get_pixel_rows = get_24bit_row; |
| 398 | break; |
| 399 | case 4: |
| 400 | source->get_pixel_rows = get_32bit_row; |
| 401 | break; |
| 402 | default: |
| 403 | ERREXIT(cinfo, JERR_TGA_BADPARMS); |
| 404 | break; |
| 405 | } |
| 406 | TRACEMS2(cinfo, 1, JTRC_TGA, width, height); |
| 407 | break; |
| 408 | case 3: /* Grayscale image */ |
| 409 | components = 1; |
| 410 | cinfo->in_color_space = JCS_GRAYSCALE; |
| 411 | if (source->pixel_size == 1) |
| 412 | source->get_pixel_rows = get_8bit_gray_row; |
| 413 | else |
| 414 | ERREXIT(cinfo, JERR_TGA_BADPARMS); |
| 415 | TRACEMS2(cinfo, 1, JTRC_TGA_GRAY, width, height); |
| 416 | break; |
| 417 | default: |
| 418 | ERREXIT(cinfo, JERR_TGA_BADPARMS); |
| 419 | break; |
| 420 | } |
| 421 | |
| 422 | if (is_bottom_up) { |
| 423 | /* Create a virtual array to buffer the upside-down image. */ |
| 424 | source->whole_image = (*cinfo->mem->request_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 425 | ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 426 | (JDIMENSION) width * components, (JDIMENSION) height, (JDIMENSION) 1); |
| 427 | if (cinfo->progress != NULL) { |
| 428 | cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
| 429 | progress->total_extra_passes++; /* count file input as separate pass */ |
| 430 | } |
| 431 | /* source->pub.buffer will point to the virtual array. */ |
| 432 | source->pub.buffer_height = 1; /* in case anyone looks at it */ |
| 433 | source->pub.get_pixel_rows = preload_image; |
| 434 | } else { |
| 435 | /* Don't need a virtual array, but do need a one-row input buffer. */ |
| 436 | source->whole_image = NULL; |
| 437 | source->pub.buffer = (*cinfo->mem->alloc_sarray) |
| 438 | ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 439 | (JDIMENSION) width * components, (JDIMENSION) 1); |
| 440 | source->pub.buffer_height = 1; |
| 441 | source->pub.get_pixel_rows = source->get_pixel_rows; |
| 442 | } |
DRC | 61976bd | 2014-04-20 19:13:10 +0000 | [diff] [blame^] | 443 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 444 | while (idlen--) /* Throw away ID field */ |
| 445 | (void) read_byte(source); |
| 446 | |
| 447 | if (maplen > 0) { |
| 448 | if (maplen > 256 || GET_2B(3) != 0) |
| 449 | ERREXIT(cinfo, JERR_TGA_BADCMAP); |
| 450 | /* Allocate space to store the colormap */ |
| 451 | source->colormap = (*cinfo->mem->alloc_sarray) |
| 452 | ((j_common_ptr) cinfo, JPOOL_IMAGE, (JDIMENSION) maplen, (JDIMENSION) 3); |
| 453 | /* and read it from the file */ |
| 454 | read_colormap(source, (int) maplen, UCH(targaheader[7])); |
| 455 | } else { |
| 456 | if (cmaptype) /* but you promised a cmap! */ |
| 457 | ERREXIT(cinfo, JERR_TGA_BADPARMS); |
| 458 | source->colormap = NULL; |
| 459 | } |
| 460 | |
| 461 | cinfo->input_components = components; |
| 462 | cinfo->data_precision = 8; |
| 463 | cinfo->image_width = width; |
| 464 | cinfo->image_height = height; |
| 465 | } |
| 466 | |
| 467 | |
| 468 | /* |
| 469 | * Finish up at the end of the file. |
| 470 | */ |
| 471 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 472 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 473 | finish_input_tga (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 474 | { |
| 475 | /* no work */ |
| 476 | } |
| 477 | |
| 478 | |
| 479 | /* |
| 480 | * The module selection routine for Targa format input. |
| 481 | */ |
| 482 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 483 | GLOBAL(cjpeg_source_ptr) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 484 | jinit_read_targa (j_compress_ptr cinfo) |
| 485 | { |
| 486 | tga_source_ptr source; |
| 487 | |
| 488 | /* Create module interface object */ |
| 489 | source = (tga_source_ptr) |
| 490 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 491 | SIZEOF(tga_source_struct)); |
| 492 | source->cinfo = cinfo; /* make back link for subroutines */ |
| 493 | /* Fill in method ptrs, except get_pixel_rows which start_input sets */ |
| 494 | source->pub.start_input = start_input_tga; |
| 495 | source->pub.finish_input = finish_input_tga; |
| 496 | |
| 497 | return (cjpeg_source_ptr) source; |
| 498 | } |
| 499 | |
| 500 | #endif /* TARGA_SUPPORTED */ |