| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (rtga.c). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | /* Modified version of stb_image's TGA sources. */ |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | #include <stdint.h> |
| 27 | #include <stdarg.h> |
| 28 | #include <stddef.h> /* ptrdiff_t on osx */ |
| 29 | #include <stdlib.h> |
| 30 | #include <string.h> |
| 31 | |
| 32 | #include <retro_inline.h> |
| 33 | |
| 34 | #include <formats/image.h> |
| 35 | #include <formats/rtga.h> |
| 36 | |
| 37 | #define RTGA_COMPUTE_Y(r, g, b) ((uint8_t)((((r) * 77) + ((g) * 150) + (29 * (b))) >> 8)) |
| 38 | |
| 39 | struct rtga |
| 40 | { |
| 41 | uint8_t *buff_data; |
| 42 | uint32_t *output_image; |
| 43 | }; |
| 44 | |
| 45 | typedef struct |
| 46 | { |
| 47 | uint8_t *img_buffer; |
| 48 | uint8_t *img_buffer_end; |
| 49 | uint8_t *img_buffer_original; |
| 50 | int buflen; |
| 51 | int img_n, img_out_n; |
| 52 | uint32_t img_x, img_y; |
| 53 | uint8_t buffer_start[128]; |
| 54 | } rtga_context; |
| 55 | |
| 56 | static INLINE uint8_t rtga_get8(rtga_context *s) |
| 57 | { |
| 58 | if (s->img_buffer < s->img_buffer_end) |
| 59 | return *s->img_buffer++; |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static void rtga_skip(rtga_context *s, int n) |
| 64 | { |
| 65 | if (n < 0) |
| 66 | { |
| 67 | s->img_buffer = s->img_buffer_end; |
| 68 | return; |
| 69 | } |
| 70 | s->img_buffer += n; |
| 71 | } |
| 72 | |
| 73 | static int rtga_get16le(rtga_context *s) |
| 74 | { |
| 75 | return rtga_get8(s) + (rtga_get8(s) << 8); |
| 76 | } |
| 77 | |
| 78 | static unsigned char *rtga_convert_format( |
| 79 | unsigned char *data, |
| 80 | int img_n, |
| 81 | int req_comp, |
| 82 | unsigned int x, |
| 83 | unsigned int y) |
| 84 | { |
| 85 | int i,j; |
| 86 | unsigned char *good = (unsigned char *) malloc(req_comp * x * y); |
| 87 | |
| 88 | if (!good) |
| 89 | { |
| 90 | free(data); |
| 91 | return NULL; |
| 92 | } |
| 93 | |
| 94 | for (j=0; j < (int) y; ++j) |
| 95 | { |
| 96 | unsigned char *src = data + j * x * img_n ; |
| 97 | unsigned char *dest = good + j * x * req_comp; |
| 98 | |
| 99 | switch (((img_n)*8+(req_comp))) |
| 100 | { |
| 101 | case ((1)*8+(2)): |
| 102 | for (i=x-1; i >= 0; --i, src += 1, dest += 2) |
| 103 | { |
| 104 | dest[0]=src[0]; |
| 105 | dest[1]=255; |
| 106 | } |
| 107 | break; |
| 108 | case ((1)*8+(3)): |
| 109 | for (i=x-1; i >= 0; --i, src += 1, dest += 3) |
| 110 | dest[0]=dest[1]=dest[2]=src[0]; |
| 111 | break; |
| 112 | case ((1)*8+(4)): |
| 113 | for (i=x-1; i >= 0; --i, src += 1, dest += 4) |
| 114 | { |
| 115 | dest[0]=dest[1]=dest[2]=src[0]; |
| 116 | dest[3]=255; |
| 117 | } |
| 118 | break; |
| 119 | case ((2)*8+(1)): |
| 120 | for (i=x-1; i >= 0; --i, src += 2, dest += 1) |
| 121 | dest[0]=src[0]; |
| 122 | break; |
| 123 | case ((2)*8+(3)): |
| 124 | for (i=x-1; i >= 0; --i, src += 2, dest += 3) |
| 125 | dest[0]=dest[1]=dest[2]=src[0]; |
| 126 | break; |
| 127 | case ((2)*8+(4)): |
| 128 | for (i=x-1; i >= 0; --i, src += 2, dest += 4) |
| 129 | { |
| 130 | dest[0]=dest[1]=dest[2]=src[0]; |
| 131 | dest[3]=src[1]; |
| 132 | } |
| 133 | break; |
| 134 | case ((3)*8+(4)): |
| 135 | for (i=x-1; i >= 0; --i, src += 3, dest += 4) |
| 136 | { |
| 137 | dest[0]=src[0]; |
| 138 | dest[1]=src[1]; |
| 139 | dest[2]=src[2]; |
| 140 | dest[3]=255; |
| 141 | } |
| 142 | break; |
| 143 | case ((3)*8+(1)): |
| 144 | for (i=x-1; i >= 0; --i, src += 3, dest += 1) |
| 145 | dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]); |
| 146 | break; |
| 147 | case ((3)*8+(2)): |
| 148 | for (i=x-1; i >= 0; --i, src += 3, dest += 2) |
| 149 | { |
| 150 | dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]); |
| 151 | dest[1] = 255; |
| 152 | } |
| 153 | break; |
| 154 | case ((4)*8+(1)): |
| 155 | for (i=x-1; i >= 0; --i, src += 4, dest += 1) |
| 156 | dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]); |
| 157 | break; |
| 158 | case ((4)*8+(2)): |
| 159 | for (i=x-1; i >= 0; --i, src += 4, dest += 2) |
| 160 | { |
| 161 | dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]); |
| 162 | dest[1] = src[3]; |
| 163 | } |
| 164 | break; |
| 165 | case ((4)*8+(3)): |
| 166 | for (i=x-1; i >= 0; --i, src += 4, dest += 3) |
| 167 | { |
| 168 | dest[0]=src[0]; |
| 169 | dest[1]=src[1]; |
| 170 | dest[2]=src[2]; |
| 171 | } |
| 172 | break; |
| 173 | default: |
| 174 | break; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | free(data); |
| 179 | return good; |
| 180 | } |
| 181 | |
| 182 | static uint8_t *rtga_tga_load(rtga_context *s, |
| 183 | unsigned *x, unsigned *y, int *comp, int req_comp) |
| 184 | { |
| 185 | /* Read in the TGA header stuff */ |
| 186 | int tga_offset = rtga_get8(s); |
| 187 | int tga_indexed = rtga_get8(s); |
| 188 | int tga_image_type = rtga_get8(s); |
| 189 | int tga_is_RLE = 0; |
| 190 | int tga_palette_start = rtga_get16le(s); |
| 191 | int tga_palette_len = rtga_get16le(s); |
| 192 | int tga_palette_bits = rtga_get8(s); |
| 193 | int tga_x_origin = rtga_get16le(s); |
| 194 | int tga_y_origin = rtga_get16le(s); |
| 195 | int tga_width = rtga_get16le(s); |
| 196 | int tga_height = rtga_get16le(s); |
| 197 | int tga_bits_per_pixel = rtga_get8(s); |
| 198 | int tga_comp = tga_bits_per_pixel / 8; |
| 199 | int tga_inverted = rtga_get8(s); |
| 200 | |
| 201 | /* image data */ |
| 202 | unsigned char *tga_data = NULL; |
| 203 | |
| 204 | (void)tga_palette_start; |
| 205 | (void)tga_x_origin; |
| 206 | (void)tga_y_origin; |
| 207 | |
| 208 | /* do a tiny bit of precessing */ |
| 209 | if (tga_image_type >= 8) |
| 210 | { |
| 211 | tga_image_type -= 8; |
| 212 | tga_is_RLE = 1; |
| 213 | } |
| 214 | |
| 215 | /* int tga_alpha_bits = tga_inverted & 15; */ |
| 216 | tga_inverted = 1 - ((tga_inverted >> 5) & 1); |
| 217 | |
| 218 | /* error check */ |
| 219 | if ( |
| 220 | (tga_width < 1) || (tga_height < 1) || |
| 221 | (tga_image_type < 1) || (tga_image_type > 3) || |
| 222 | ( |
| 223 | (tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) && |
| 224 | (tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32) |
| 225 | ) |
| 226 | ) |
| 227 | return NULL; /* we don't report this as a bad TGA because we don't even know if it's TGA */ |
| 228 | |
| 229 | /* If paletted, then we will use the number of bits from the palette */ |
| 230 | if (tga_indexed) |
| 231 | tga_comp = tga_palette_bits / 8; |
| 232 | |
| 233 | /* TGA info */ |
| 234 | *x = tga_width; |
| 235 | *y = tga_height; |
| 236 | if (comp) |
| 237 | *comp = tga_comp; |
| 238 | |
| 239 | tga_data = (unsigned char*)malloc((size_t)tga_width * tga_height * tga_comp); |
| 240 | if (!tga_data) |
| 241 | return NULL; |
| 242 | |
| 243 | /* skip to the data's starting position (offset usually = 0) */ |
| 244 | rtga_skip(s, tga_offset ); |
| 245 | |
| 246 | if (!tga_indexed && !tga_is_RLE) |
| 247 | { |
| 248 | int i; |
| 249 | for (i=0; i < tga_height; ++i) |
| 250 | { |
| 251 | int _y = tga_inverted ? (tga_height -i - 1) : i; |
| 252 | uint8_t *tga_row = tga_data + _y * tga_width * tga_comp; |
| 253 | int n = tga_width * tga_comp; |
| 254 | |
| 255 | if (s->img_buffer + n <= s->img_buffer_end) |
| 256 | { |
| 257 | memcpy(tga_row, s->img_buffer, n); |
| 258 | s->img_buffer += n; |
| 259 | } |
| 260 | } |
| 261 | } |
| 262 | else |
| 263 | { |
| 264 | int i, j; |
| 265 | int RLE_repeating = 0; |
| 266 | int RLE_count = 0; |
| 267 | int read_next_pixel = 1; |
| 268 | /* Needs to be at least 33 bytes to silence a GCC warning, |
| 269 | * only 4 are actually used */ |
| 270 | unsigned char raw_data[33] = {0}; |
| 271 | unsigned char *tga_palette = NULL; |
| 272 | |
| 273 | /* Do I need to load a palette? */ |
| 274 | if (tga_indexed) |
| 275 | { |
| 276 | int n; |
| 277 | /* Any data to skip? (offset usually = 0) */ |
| 278 | rtga_skip(s, tga_palette_start ); |
| 279 | /* Load the palette */ |
| 280 | tga_palette = (unsigned char*)malloc(tga_palette_len * tga_palette_bits / 8); |
| 281 | |
| 282 | if (!tga_palette) |
| 283 | { |
| 284 | free(tga_data); |
| 285 | return NULL; |
| 286 | } |
| 287 | |
| 288 | n = tga_palette_len * tga_palette_bits / 8; |
| 289 | |
| 290 | if (s->img_buffer+n <= s->img_buffer_end) |
| 291 | { |
| 292 | memcpy(tga_palette, s->img_buffer, n); |
| 293 | s->img_buffer += n; |
| 294 | } |
| 295 | else |
| 296 | { |
| 297 | free(tga_data); |
| 298 | free(tga_palette); |
| 299 | return NULL; |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | /* load the data */ |
| 304 | for (i=0; i < tga_width * tga_height; ++i) |
| 305 | { |
| 306 | /* if I'm in RLE mode, do I need to get a RLE rtga_png chunk? */ |
| 307 | if (tga_is_RLE) |
| 308 | { |
| 309 | if (RLE_count == 0) |
| 310 | { |
| 311 | /* yep, get the next byte as a RLE command */ |
| 312 | int RLE_cmd = rtga_get8(s); |
| 313 | RLE_count = 1 + (RLE_cmd & 127); |
| 314 | RLE_repeating = RLE_cmd >> 7; |
| 315 | read_next_pixel = 1; |
| 316 | } |
| 317 | else if (!RLE_repeating) |
| 318 | read_next_pixel = 1; |
| 319 | } |
| 320 | else |
| 321 | read_next_pixel = 1; |
| 322 | |
| 323 | /* OK, if I need to read a pixel, do it now */ |
| 324 | if (read_next_pixel) |
| 325 | { |
| 326 | /* load however much data we did have */ |
| 327 | if (tga_indexed) |
| 328 | { |
| 329 | /* read in 1 byte, then perform the lookup */ |
| 330 | int pal_idx = rtga_get8(s); |
| 331 | if (pal_idx >= tga_palette_len) /* invalid index */ |
| 332 | pal_idx = 0; |
| 333 | pal_idx *= tga_bits_per_pixel / 8; |
| 334 | for (j = 0; j*8 < tga_bits_per_pixel; ++j) |
| 335 | raw_data[j] = tga_palette[pal_idx+j]; |
| 336 | } |
| 337 | else |
| 338 | { |
| 339 | /* read in the data raw */ |
| 340 | for (j = 0; j*8 < tga_bits_per_pixel; ++j) |
| 341 | raw_data[j] = rtga_get8(s); |
| 342 | } |
| 343 | |
| 344 | /* clear the reading flag for the next pixel */ |
| 345 | read_next_pixel = 0; |
| 346 | } /* end of reading a pixel */ |
| 347 | |
| 348 | /* copy data */ |
| 349 | for (j = 0; j < tga_comp; ++j) |
| 350 | tga_data[i*tga_comp+j] = raw_data[j]; |
| 351 | |
| 352 | /* in case we're in RLE mode, keep counting down */ |
| 353 | --RLE_count; |
| 354 | } |
| 355 | |
| 356 | /* do I need to invert the image? */ |
| 357 | if (tga_inverted) |
| 358 | { |
| 359 | if (tga_data) |
| 360 | { |
| 361 | for (j = 0; j*2 < tga_height; ++j) |
| 362 | { |
| 363 | int index1 = j * tga_width * tga_comp; |
| 364 | int index2 = (tga_height - 1 - j) * tga_width * tga_comp; |
| 365 | |
| 366 | for (i = tga_width * tga_comp; i > 0; --i) |
| 367 | { |
| 368 | unsigned char temp = tga_data[index1]; |
| 369 | tga_data[index1] = tga_data[index2]; |
| 370 | tga_data[index2] = temp; |
| 371 | ++index1; |
| 372 | ++index2; |
| 373 | } |
| 374 | } |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | /* Clear my palette, if I had one */ |
| 379 | if (tga_palette) |
| 380 | free(tga_palette); |
| 381 | } |
| 382 | |
| 383 | /* swap RGB */ |
| 384 | if (tga_comp >= 3) |
| 385 | { |
| 386 | int i; |
| 387 | unsigned char* tga_pixel = tga_data; |
| 388 | |
| 389 | for (i = 0; i < tga_width * tga_height; ++i) |
| 390 | { |
| 391 | unsigned char temp = tga_pixel[0]; |
| 392 | tga_pixel[0] = tga_pixel[2]; |
| 393 | tga_pixel[2] = temp; |
| 394 | tga_pixel += tga_comp; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | /* convert to target component count */ |
| 399 | if ( (req_comp) |
| 400 | && (req_comp >= 1 && req_comp <= 4) |
| 401 | && (req_comp != tga_comp)) |
| 402 | { |
| 403 | tga_data = rtga_convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height); |
| 404 | } |
| 405 | |
| 406 | return tga_data; |
| 407 | } |
| 408 | |
| 409 | static uint8_t *rtga_load_from_memory(uint8_t const *buffer, int len, |
| 410 | unsigned *x, unsigned *y, int *comp, int req_comp) |
| 411 | { |
| 412 | rtga_context s; |
| 413 | |
| 414 | s.img_buffer = (uint8_t *)buffer; |
| 415 | s.img_buffer_original = (uint8_t *) buffer; |
| 416 | s.img_buffer_end = (uint8_t *) buffer+len; |
| 417 | |
| 418 | return rtga_tga_load(&s,x,y,comp,req_comp); |
| 419 | } |
| 420 | |
| 421 | int rtga_process_image(rtga_t *rtga, void **buf_data, |
| 422 | size_t size, unsigned *width, unsigned *height) |
| 423 | { |
| 424 | int comp; |
| 425 | unsigned size_tex = 0; |
| 426 | |
| 427 | if (!rtga) |
| 428 | return IMAGE_PROCESS_ERROR; |
| 429 | |
| 430 | rtga->output_image = (uint32_t*)rtga_load_from_memory(rtga->buff_data, |
| 431 | (int)size, width, height, &comp, 4); |
| 432 | *buf_data = rtga->output_image; |
| 433 | size_tex = (*width) * (*height); |
| 434 | |
| 435 | /* Convert RGBA to ARGB */ |
| 436 | while (size_tex--) |
| 437 | { |
| 438 | unsigned int texel = rtga->output_image[size_tex]; |
| 439 | unsigned int A = texel & 0xFF000000; |
| 440 | unsigned int B = texel & 0x00FF0000; |
| 441 | unsigned int G = texel & 0x0000FF00; |
| 442 | unsigned int R = texel & 0x000000FF; |
| 443 | ((unsigned int*)rtga->output_image)[size_tex] = A | (R << 16) | G | (B >> 16); |
| 444 | }; |
| 445 | |
| 446 | return IMAGE_PROCESS_END; |
| 447 | } |
| 448 | |
| 449 | bool rtga_set_buf_ptr(rtga_t *rtga, void *data) |
| 450 | { |
| 451 | if (!rtga) |
| 452 | return false; |
| 453 | |
| 454 | rtga->buff_data = (uint8_t*)data; |
| 455 | |
| 456 | return true; |
| 457 | } |
| 458 | |
| 459 | void rtga_free(rtga_t *rtga) |
| 460 | { |
| 461 | if (!rtga) |
| 462 | return; |
| 463 | |
| 464 | free(rtga); |
| 465 | } |
| 466 | |
| 467 | rtga_t *rtga_alloc(void) |
| 468 | { |
| 469 | rtga_t *rtga = (rtga_t*)calloc(1, sizeof(*rtga)); |
| 470 | if (!rtga) |
| 471 | return NULL; |
| 472 | return rtga; |
| 473 | } |