| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: imagtga.cpp |
| 3 | // Purpose: wxImage TGA handler |
| 4 | // Author: Seth Jackson |
| 5 | // CVS-ID: $Id$ |
| 6 | // Copyright: (c) 2005 Seth Jackson |
| 7 | // Licence: wxWindows licence |
| 8 | ///////////////////////////////////////////////////////////////////////////// |
| 9 | |
| 10 | // ============================================================================ |
| 11 | // declarations |
| 12 | // ============================================================================ |
| 13 | |
| 14 | // ---------------------------------------------------------------------------- |
| 15 | // headers |
| 16 | // ---------------------------------------------------------------------------- |
| 17 | |
| 18 | // For compilers that support precompilation, includes "wx.h". |
| 19 | #include "wx/wxprec.h" |
| 20 | |
| 21 | #ifdef __BORLANDC__ |
| 22 | #pragma hdrstop |
| 23 | #endif |
| 24 | |
| 25 | #if wxUSE_IMAGE && wxUSE_TGA |
| 26 | |
| 27 | #ifndef WX_PRECOMP |
| 28 | #include "wx/palette.h" |
| 29 | #endif |
| 30 | |
| 31 | #include "wx/imagtga.h" |
| 32 | #include "wx/log.h" |
| 33 | #include "wx/scopeguard.h" |
| 34 | |
| 35 | // ---------------------------------------------------------------------------- |
| 36 | // constants |
| 37 | // ---------------------------------------------------------------------------- |
| 38 | |
| 39 | // TGA error codes. |
| 40 | enum |
| 41 | { |
| 42 | wxTGA_OK, |
| 43 | wxTGA_INVFORMAT, |
| 44 | wxTGA_MEMERR, |
| 45 | wxTGA_IOERR |
| 46 | }; |
| 47 | |
| 48 | // TGA header bytes. |
| 49 | enum |
| 50 | { |
| 51 | HDR_OFFSET = 0, |
| 52 | HDR_COLORTYPE = 1, |
| 53 | HDR_IMAGETYPE = 2, |
| 54 | HDR_PALETTESTART = 3, |
| 55 | HDR_PALETTELENGTH = 5, |
| 56 | HDR_PALETTEBITS = 7, |
| 57 | HDR_XORIGIN = 8, |
| 58 | HDR_YORIGIN = 10, |
| 59 | HDR_WIDTH = 12, |
| 60 | HDR_HEIGHT = 14, |
| 61 | HDR_BPP = 16, |
| 62 | HDR_ORIENTATION = 17, |
| 63 | HDR_SIZE |
| 64 | }; |
| 65 | |
| 66 | // TGA color types. |
| 67 | enum |
| 68 | { |
| 69 | wxTGA_UNMAPPED = 0, |
| 70 | wxTGA_MAPPED = 1 |
| 71 | }; |
| 72 | |
| 73 | // ============================================================================ |
| 74 | // implementation |
| 75 | // ============================================================================ |
| 76 | |
| 77 | IMPLEMENT_DYNAMIC_CLASS(wxTGAHandler, wxImageHandler) |
| 78 | |
| 79 | #if wxUSE_STREAMS |
| 80 | |
| 81 | // ---------------------------------------------------------------------------- |
| 82 | // worker functions |
| 83 | // ---------------------------------------------------------------------------- |
| 84 | |
| 85 | static |
| 86 | void FlipTGA(unsigned char* imageData, int width, int height, short pixelSize) |
| 87 | { |
| 88 | int lineLength = width * pixelSize; |
| 89 | unsigned char *line1 = imageData; |
| 90 | unsigned char *line2 = &imageData[lineLength * (height - 1)]; |
| 91 | |
| 92 | unsigned char temp; |
| 93 | for ( ; line1 < line2; line2 -= (lineLength * 2)) |
| 94 | { |
| 95 | for (int index = 0; index < lineLength; line1++, line2++, index++) |
| 96 | { |
| 97 | temp = *line1; |
| 98 | *line1 = *line2; |
| 99 | *line2 = temp; |
| 100 | } |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | // return wxTGA_OK or wxTGA_IOERR |
| 105 | static |
| 106 | int DecodeRLE(unsigned char* imageData, unsigned long imageSize, |
| 107 | short pixelSize, wxInputStream& stream) |
| 108 | { |
| 109 | unsigned long index = 0; |
| 110 | unsigned char current; |
| 111 | unsigned int length; |
| 112 | unsigned char buf[4]; |
| 113 | |
| 114 | while (index < imageSize) |
| 115 | { |
| 116 | int ch = stream.GetC(); |
| 117 | if ( ch == wxEOF ) |
| 118 | return wxTGA_IOERR; |
| 119 | |
| 120 | current = ch; |
| 121 | |
| 122 | // RLE packet. |
| 123 | if ( current & 0x80 ) |
| 124 | { |
| 125 | // Get the run length of the packet. |
| 126 | current &= 0x7f; |
| 127 | |
| 128 | current++; |
| 129 | |
| 130 | length = current; |
| 131 | |
| 132 | index += current * pixelSize; |
| 133 | |
| 134 | // Repeat the pixel length times. |
| 135 | if ( !stream.Read(buf, pixelSize) ) |
| 136 | return wxTGA_IOERR; |
| 137 | |
| 138 | for (unsigned int i = 0; i < length; i++) |
| 139 | { |
| 140 | memcpy(imageData, buf, pixelSize); |
| 141 | |
| 142 | imageData += pixelSize; |
| 143 | } |
| 144 | } |
| 145 | else // Raw packet. |
| 146 | { |
| 147 | // Get the run length of the packet. |
| 148 | current++; |
| 149 | |
| 150 | length = current * pixelSize; |
| 151 | |
| 152 | index += length; |
| 153 | |
| 154 | // Write the next length pixels directly to the image data. |
| 155 | if ( !stream.Read(imageData, length) ) |
| 156 | return wxTGA_IOERR; |
| 157 | |
| 158 | imageData += length; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | return wxTGA_OK; |
| 163 | } |
| 164 | |
| 165 | static |
| 166 | int ReadTGA(wxImage* image, wxInputStream& stream) |
| 167 | { |
| 168 | // Read in the TGA header |
| 169 | unsigned char hdr[HDR_SIZE]; |
| 170 | stream.Read(hdr, HDR_SIZE); |
| 171 | |
| 172 | short offset = hdr[HDR_OFFSET] + HDR_SIZE; |
| 173 | short colorType = hdr[HDR_COLORTYPE]; |
| 174 | short imageType = hdr[HDR_IMAGETYPE]; |
| 175 | int paletteLength = hdr[HDR_PALETTELENGTH] + 256 * hdr[HDR_PALETTELENGTH + 1]; |
| 176 | int width = (hdr[HDR_WIDTH] + 256 * hdr[HDR_WIDTH + 1]) - |
| 177 | (hdr[HDR_XORIGIN] + 256 * hdr[HDR_XORIGIN + 1]); |
| 178 | int height = (hdr[HDR_HEIGHT] + 256 * hdr[HDR_HEIGHT + 1]) - |
| 179 | (hdr[HDR_YORIGIN] + 256 * hdr[HDR_YORIGIN + 1]); |
| 180 | short bpp = hdr[HDR_BPP]; |
| 181 | short orientation = hdr[HDR_ORIENTATION] & 0x20; |
| 182 | |
| 183 | image->Create(width, height); |
| 184 | |
| 185 | if (!image->Ok()) |
| 186 | { |
| 187 | return wxTGA_MEMERR; |
| 188 | } |
| 189 | |
| 190 | const short pixelSize = bpp / 8; |
| 191 | |
| 192 | const unsigned long imageSize = width * height * pixelSize; |
| 193 | |
| 194 | unsigned char *imageData = (unsigned char* )malloc(imageSize); |
| 195 | |
| 196 | if (!imageData) |
| 197 | { |
| 198 | return wxTGA_MEMERR; |
| 199 | } |
| 200 | |
| 201 | wxON_BLOCK_EXIT1(free, imageData); |
| 202 | |
| 203 | unsigned char *dst = image->GetData(); |
| 204 | |
| 205 | unsigned char* alpha = NULL; |
| 206 | if (bpp == 16 || bpp == 32) |
| 207 | { |
| 208 | image->SetAlpha(); |
| 209 | |
| 210 | alpha = image->GetAlpha(); |
| 211 | } |
| 212 | |
| 213 | // Seek from the offset we got from the TGA header. |
| 214 | stream.SeekI(offset, wxFromStart); |
| 215 | |
| 216 | // Load a palette if we have one. |
| 217 | if (colorType == wxTGA_MAPPED) |
| 218 | { |
| 219 | unsigned char buf[3]; |
| 220 | |
| 221 | unsigned char* r = new unsigned char[paletteLength]; |
| 222 | unsigned char* g = new unsigned char[paletteLength]; |
| 223 | unsigned char* b = new unsigned char[paletteLength]; |
| 224 | |
| 225 | for (int i = 0; i < paletteLength; i++) |
| 226 | { |
| 227 | stream.Read(buf, 3); |
| 228 | |
| 229 | r[i] = buf[2]; |
| 230 | g[i] = buf[1]; |
| 231 | b[i] = buf[0]; |
| 232 | } |
| 233 | |
| 234 | #if wxUSE_PALETTE |
| 235 | // Set the palette of the image. |
| 236 | image->SetPalette(wxPalette(paletteLength, r, g, b)); |
| 237 | #endif // wxUSE_PALETTE |
| 238 | |
| 239 | delete[] r; |
| 240 | delete[] g; |
| 241 | delete[] b; |
| 242 | } |
| 243 | |
| 244 | // Handle the various TGA formats we support. |
| 245 | |
| 246 | switch (imageType) |
| 247 | { |
| 248 | #if wxUSE_PALETTE |
| 249 | // Raw indexed. |
| 250 | |
| 251 | case 1: |
| 252 | { |
| 253 | const wxPalette& palette = image->GetPalette(); |
| 254 | unsigned char r; |
| 255 | unsigned char g; |
| 256 | unsigned char b; |
| 257 | |
| 258 | // No compression read the data directly to imageData. |
| 259 | |
| 260 | stream.Read(imageData, imageSize); |
| 261 | |
| 262 | // If orientation == 0, then the image is stored upside down. |
| 263 | // We need to store it right side up. |
| 264 | |
| 265 | if (orientation == 0) |
| 266 | { |
| 267 | FlipTGA(imageData, width, height, pixelSize); |
| 268 | } |
| 269 | |
| 270 | // Handle the different pixel depths. |
| 271 | |
| 272 | switch (bpp) |
| 273 | { |
| 274 | // 8 bpp. |
| 275 | |
| 276 | case 8: |
| 277 | { |
| 278 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 279 | { |
| 280 | palette.GetRGB(imageData[index], &r, &g, &b); |
| 281 | |
| 282 | *(dst++) = r; |
| 283 | *(dst++) = g; |
| 284 | *(dst++) = b; |
| 285 | } |
| 286 | } |
| 287 | break; |
| 288 | |
| 289 | // 16 bpp. |
| 290 | |
| 291 | case 16: |
| 292 | { |
| 293 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 294 | { |
| 295 | palette.GetRGB(imageData[index], &r, &g, &b); |
| 296 | |
| 297 | *(dst++) = r; |
| 298 | *(dst++) = g; |
| 299 | *(dst++) = b; |
| 300 | *(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255; |
| 301 | } |
| 302 | } |
| 303 | break; |
| 304 | |
| 305 | default: |
| 306 | return wxTGA_INVFORMAT; |
| 307 | } |
| 308 | } |
| 309 | break; |
| 310 | #endif // wxUSE_PALETTE |
| 311 | |
| 312 | // Raw RGB. |
| 313 | |
| 314 | case 2: |
| 315 | { |
| 316 | // No compression read the data directly to imageData. |
| 317 | |
| 318 | stream.Read(imageData, imageSize); |
| 319 | |
| 320 | // If orientation == 0, then the image is stored upside down. |
| 321 | // We need to store it right side up. |
| 322 | |
| 323 | if (orientation == 0) |
| 324 | { |
| 325 | FlipTGA(imageData, width, height, pixelSize); |
| 326 | } |
| 327 | |
| 328 | // Handle the different pixel depths. |
| 329 | |
| 330 | switch (bpp) |
| 331 | { |
| 332 | //16 bpp. |
| 333 | |
| 334 | case 16: |
| 335 | { |
| 336 | unsigned char temp; |
| 337 | |
| 338 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 339 | { |
| 340 | temp = (imageData[index + 1] & 0x7c) << 1; |
| 341 | temp |= temp >> 5; |
| 342 | *(dst++) = temp; |
| 343 | |
| 344 | temp = ((imageData[index + 1] & 0x03) << 6) | ((imageData[index] & 0xe0) >> 2); |
| 345 | temp |= temp >> 5; |
| 346 | *(dst++) = temp; |
| 347 | |
| 348 | temp = (imageData[index] & 0x1f) << 3; |
| 349 | temp |= temp >> 5; |
| 350 | *(dst++) = temp; |
| 351 | |
| 352 | *(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255; |
| 353 | } |
| 354 | } |
| 355 | break; |
| 356 | |
| 357 | // 24 bpp. |
| 358 | |
| 359 | case 24: |
| 360 | { |
| 361 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 362 | { |
| 363 | *(dst++) = imageData[index + 2]; |
| 364 | *(dst++) = imageData[index + 1]; |
| 365 | *(dst++) = imageData[index]; |
| 366 | } |
| 367 | } |
| 368 | break; |
| 369 | |
| 370 | // 32 bpp. |
| 371 | |
| 372 | case 32: |
| 373 | { |
| 374 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 375 | { |
| 376 | *(dst++) = imageData[index + 2]; |
| 377 | *(dst++) = imageData[index + 1]; |
| 378 | *(dst++) = imageData[index]; |
| 379 | *(alpha++) = imageData[index + 3]; |
| 380 | } |
| 381 | } |
| 382 | break; |
| 383 | |
| 384 | default: |
| 385 | return wxTGA_INVFORMAT; |
| 386 | } |
| 387 | } |
| 388 | break; |
| 389 | |
| 390 | // Raw grayscale. |
| 391 | |
| 392 | case 3: |
| 393 | { |
| 394 | // No compression read the data directly to imageData. |
| 395 | |
| 396 | stream.Read(imageData, imageSize); |
| 397 | |
| 398 | // If orientation == 0, then the image is stored upside down. |
| 399 | // We need to store it right side up. |
| 400 | |
| 401 | if (orientation == 0) |
| 402 | { |
| 403 | FlipTGA(imageData, width, height, pixelSize); |
| 404 | } |
| 405 | |
| 406 | // Handle the different pixel depths. |
| 407 | |
| 408 | switch (bpp) |
| 409 | { |
| 410 | // 8 bpp. |
| 411 | |
| 412 | case 8: |
| 413 | { |
| 414 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 415 | { |
| 416 | *(dst++) = imageData[index]; |
| 417 | *(dst++) = imageData[index]; |
| 418 | *(dst++) = imageData[index]; |
| 419 | } |
| 420 | } |
| 421 | break; |
| 422 | |
| 423 | // 16 bpp. |
| 424 | |
| 425 | case 16: |
| 426 | { |
| 427 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 428 | { |
| 429 | *(dst++) = imageData[index]; |
| 430 | *(dst++) = imageData[index]; |
| 431 | *(dst++) = imageData[index]; |
| 432 | *(alpha++) = imageData[index + 1]; |
| 433 | } |
| 434 | } |
| 435 | break; |
| 436 | |
| 437 | default: |
| 438 | return wxTGA_INVFORMAT; |
| 439 | } |
| 440 | } |
| 441 | break; |
| 442 | |
| 443 | #if wxUSE_PALETTE |
| 444 | // RLE indexed. |
| 445 | |
| 446 | case 9: |
| 447 | { |
| 448 | const wxPalette& palette = image->GetPalette(); |
| 449 | unsigned char r; |
| 450 | unsigned char g; |
| 451 | unsigned char b; |
| 452 | |
| 453 | // Decode the RLE data. |
| 454 | |
| 455 | int rc = DecodeRLE(imageData, imageSize, pixelSize, stream); |
| 456 | if ( rc != wxTGA_OK ) |
| 457 | return rc; |
| 458 | |
| 459 | // If orientation == 0, then the image is stored upside down. |
| 460 | // We need to store it right side up. |
| 461 | |
| 462 | if (orientation == 0) |
| 463 | { |
| 464 | FlipTGA(imageData, width, height, pixelSize); |
| 465 | } |
| 466 | |
| 467 | // Handle the different pixel depths. |
| 468 | |
| 469 | switch (bpp) |
| 470 | { |
| 471 | // 8 bpp. |
| 472 | |
| 473 | case 8: |
| 474 | { |
| 475 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 476 | { |
| 477 | palette.GetRGB(imageData[index], &r, &g, &b); |
| 478 | |
| 479 | *(dst++) = r; |
| 480 | *(dst++) = g; |
| 481 | *(dst++) = b; |
| 482 | } |
| 483 | } |
| 484 | break; |
| 485 | |
| 486 | // 16 bpp. |
| 487 | |
| 488 | case 16: |
| 489 | { |
| 490 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 491 | { |
| 492 | palette.GetRGB(imageData[index], &r, &g, &b); |
| 493 | |
| 494 | *(dst++) = r; |
| 495 | *(dst++) = g; |
| 496 | *(dst++) = b; |
| 497 | *(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255; |
| 498 | } |
| 499 | } |
| 500 | break; |
| 501 | |
| 502 | default: |
| 503 | return wxTGA_INVFORMAT; |
| 504 | } |
| 505 | } |
| 506 | break; |
| 507 | #endif // wxUSE_PALETTE |
| 508 | |
| 509 | // RLE RGB. |
| 510 | |
| 511 | case 10: |
| 512 | { |
| 513 | // Decode the RLE data. |
| 514 | |
| 515 | int rc = DecodeRLE(imageData, imageSize, pixelSize, stream); |
| 516 | if ( rc != wxTGA_OK ) |
| 517 | return rc; |
| 518 | |
| 519 | // If orientation == 0, then the image is stored upside down. |
| 520 | // We need to store it right side up. |
| 521 | |
| 522 | if (orientation == 0) |
| 523 | { |
| 524 | FlipTGA(imageData, width, height, pixelSize); |
| 525 | } |
| 526 | |
| 527 | // Handle the different pixel depths. |
| 528 | |
| 529 | switch (bpp) |
| 530 | { |
| 531 | //16 bpp. |
| 532 | |
| 533 | case 16: |
| 534 | { |
| 535 | unsigned char temp; |
| 536 | |
| 537 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 538 | { |
| 539 | temp = (imageData[index + 1] & 0x7c) << 1; |
| 540 | temp |= temp >> 5; |
| 541 | *(dst++) = temp; |
| 542 | |
| 543 | temp = ((imageData[index + 1] & 0x03) << 6) | ((imageData[index] & 0xe0) >> 2); |
| 544 | temp |= temp >> 5; |
| 545 | *(dst++) = temp; |
| 546 | |
| 547 | temp = (imageData[index] & 0x1f) << 3; |
| 548 | temp |= temp >> 5; |
| 549 | *(dst++) = temp; |
| 550 | |
| 551 | *(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255; |
| 552 | } |
| 553 | } |
| 554 | break; |
| 555 | |
| 556 | // 24 bpp. |
| 557 | |
| 558 | case 24: |
| 559 | { |
| 560 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 561 | { |
| 562 | *(dst++) = imageData[index + 2]; |
| 563 | *(dst++) = imageData[index + 1]; |
| 564 | *(dst++) = imageData[index]; |
| 565 | } |
| 566 | } |
| 567 | break; |
| 568 | |
| 569 | // 32 bpp. |
| 570 | |
| 571 | case 32: |
| 572 | { |
| 573 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 574 | { |
| 575 | *(dst++) = imageData[index + 2]; |
| 576 | *(dst++) = imageData[index + 1]; |
| 577 | *(dst++) = imageData[index]; |
| 578 | *(alpha++) = imageData[index + 3]; |
| 579 | } |
| 580 | } |
| 581 | break; |
| 582 | |
| 583 | default: |
| 584 | return wxTGA_INVFORMAT; |
| 585 | } |
| 586 | } |
| 587 | break; |
| 588 | |
| 589 | // RLE grayscale. |
| 590 | |
| 591 | case 11: |
| 592 | { |
| 593 | // Decode the RLE data. |
| 594 | |
| 595 | int rc = DecodeRLE(imageData, imageSize, pixelSize, stream); |
| 596 | if ( rc != wxTGA_OK ) |
| 597 | return rc; |
| 598 | |
| 599 | // If orientation == 0, then the image is stored upside down. |
| 600 | // We need to store it right side up. |
| 601 | |
| 602 | if (orientation == 0) |
| 603 | { |
| 604 | FlipTGA(imageData, width, height, pixelSize); |
| 605 | } |
| 606 | |
| 607 | // Handle the different pixel depths. |
| 608 | |
| 609 | switch (bpp) |
| 610 | { |
| 611 | // 8 bpp. |
| 612 | |
| 613 | case 8: |
| 614 | { |
| 615 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 616 | { |
| 617 | *(dst++) = imageData[index]; |
| 618 | *(dst++) = imageData[index]; |
| 619 | *(dst++) = imageData[index]; |
| 620 | } |
| 621 | } |
| 622 | break; |
| 623 | |
| 624 | // 16 bpp. |
| 625 | |
| 626 | case 16: |
| 627 | { |
| 628 | for (unsigned long index = 0; index < imageSize; index += pixelSize) |
| 629 | { |
| 630 | *(dst++) = imageData[index]; |
| 631 | *(dst++) = imageData[index]; |
| 632 | *(dst++) = imageData[index]; |
| 633 | *(alpha++) = imageData[index + 1]; |
| 634 | } |
| 635 | } |
| 636 | break; |
| 637 | |
| 638 | default: |
| 639 | return wxTGA_INVFORMAT; |
| 640 | } |
| 641 | } |
| 642 | break; |
| 643 | |
| 644 | default: |
| 645 | return wxTGA_INVFORMAT; |
| 646 | } |
| 647 | |
| 648 | return wxTGA_OK; |
| 649 | } |
| 650 | |
| 651 | static |
| 652 | int SaveTGA(wxImage* WXUNUSED(image), wxOutputStream& WXUNUSED(stream)) |
| 653 | { |
| 654 | wxLogError(wxT("Saving in TGA format is not implemented.")); |
| 655 | |
| 656 | return wxTGA_OK; |
| 657 | } |
| 658 | |
| 659 | // ---------------------------------------------------------------------------- |
| 660 | // wxTGAHandler |
| 661 | // ---------------------------------------------------------------------------- |
| 662 | |
| 663 | bool wxTGAHandler::LoadFile(wxImage* image, |
| 664 | wxInputStream& stream, |
| 665 | bool verbose, |
| 666 | int WXUNUSED(index)) |
| 667 | { |
| 668 | if ( !CanRead(stream) ) |
| 669 | { |
| 670 | if ( verbose ) |
| 671 | wxLogError(wxT("TGA: this is not a TGA file.")); |
| 672 | |
| 673 | return false; |
| 674 | } |
| 675 | |
| 676 | image->Destroy(); |
| 677 | |
| 678 | int error = ReadTGA(image, stream); |
| 679 | if ( error != wxTGA_OK ) |
| 680 | { |
| 681 | if ( verbose ) |
| 682 | { |
| 683 | switch ( error ) |
| 684 | { |
| 685 | case wxTGA_INVFORMAT: |
| 686 | wxLogError(wxT("TGA: image format unsupported.")); |
| 687 | break; |
| 688 | |
| 689 | case wxTGA_MEMERR: |
| 690 | wxLogError(wxT("TGA: couldn't allocate memory.")); |
| 691 | break; |
| 692 | |
| 693 | case wxTGA_IOERR: |
| 694 | wxLogError(wxT("TGA: couldn't read image data.")); |
| 695 | break; |
| 696 | |
| 697 | default: |
| 698 | wxLogError(wxT("TGA: unknown error!")); |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | image->Destroy(); |
| 703 | |
| 704 | return false; |
| 705 | } |
| 706 | |
| 707 | return true; |
| 708 | } |
| 709 | |
| 710 | bool wxTGAHandler::SaveFile(wxImage* image, wxOutputStream& stream, bool verbose) |
| 711 | { |
| 712 | int error = SaveTGA(image, stream); |
| 713 | |
| 714 | if ( error != wxTGA_OK ) |
| 715 | { |
| 716 | if ( verbose ) |
| 717 | { |
| 718 | switch ( error ) |
| 719 | { |
| 720 | case wxTGA_INVFORMAT: |
| 721 | wxLogError(wxT("TGA: invalid image.")); |
| 722 | break; |
| 723 | |
| 724 | case wxTGA_MEMERR: |
| 725 | wxLogError(wxT("TGA: couldn't allocate memory.")); |
| 726 | break; |
| 727 | |
| 728 | default: |
| 729 | wxLogError(wxT("TGA: unknown error!")); |
| 730 | } |
| 731 | } |
| 732 | |
| 733 | return false; |
| 734 | } |
| 735 | |
| 736 | return true; |
| 737 | } |
| 738 | |
| 739 | bool wxTGAHandler::DoCanRead(wxInputStream& stream) |
| 740 | { |
| 741 | // read the fixed-size TGA headers |
| 742 | unsigned char hdr[HDR_SIZE]; |
| 743 | stream.Read(hdr, HDR_SIZE); |
| 744 | |
| 745 | // Check wether we can read the file or not. |
| 746 | |
| 747 | short colorType = hdr[HDR_COLORTYPE]; |
| 748 | if ( colorType != wxTGA_UNMAPPED && colorType != wxTGA_MAPPED ) |
| 749 | { |
| 750 | return false; |
| 751 | } |
| 752 | |
| 753 | short imageType = hdr[HDR_IMAGETYPE]; |
| 754 | if ( imageType == 0 || imageType == 32 || imageType == 33 ) |
| 755 | { |
| 756 | return false; |
| 757 | } |
| 758 | |
| 759 | short bpp = hdr[HDR_BPP]; |
| 760 | if ( bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32 ) |
| 761 | { |
| 762 | return false; |
| 763 | } |
| 764 | |
| 765 | return true; |
| 766 | } |
| 767 | |
| 768 | #endif // wxUSE_STREAMS |
| 769 | |
| 770 | #endif // wxUSE_IMAGE && wxUSE_TGA |