1 // 2 // Copyright 2006 The Android Open Source Project 3 // 4 // Build resource files from raw assets. 5 // 6 7 #define PNG_INTERNAL 8 9 #include "Images.h" 10 11 #include <utils/ResourceTypes.h> 12 #include <utils/ByteOrder.h> 13 14 #include <png.h> 15 16 #define NOISY(x) //x 17 18 static void 19 png_write_aapt_file(png_structp png_ptr, png_bytep data, png_size_t length) 20 { 21 status_t err = ((AaptFile*)png_ptr->io_ptr)->writeData(data, length); 22 if (err != NO_ERROR) { 23 png_error(png_ptr, "Write Error"); 24 } 25 } 26 27 28 static void 29 png_flush_aapt_file(png_structp png_ptr) 30 { 31 } 32 33 // This holds an image as 8bpp RGBA. 34 struct image_info 35 { 36 image_info() : rows(NULL), is9Patch(false), allocRows(NULL) { } 37 ~image_info() { 38 if (rows && rows != allocRows) { 39 free(rows); 40 } 41 if (allocRows) { 42 for (int i=0; i<(int)allocHeight; i++) { 43 free(allocRows[i]); 44 } 45 free(allocRows); 46 } 47 free(info9Patch.xDivs); 48 free(info9Patch.yDivs); 49 free(info9Patch.colors); 50 } 51 52 png_uint_32 width; 53 png_uint_32 height; 54 png_bytepp rows; 55 56 // 9-patch info. 57 bool is9Patch; 58 Res_png_9patch info9Patch; 59 60 png_uint_32 allocHeight; 61 png_bytepp allocRows; 62 }; 63 64 static void read_png(const char* imageName, 65 png_structp read_ptr, png_infop read_info, 66 image_info* outImageInfo) 67 { 68 int color_type; 69 int bit_depth, interlace_type, compression_type; 70 int i; 71 72 png_read_info(read_ptr, read_info); 73 74 png_get_IHDR(read_ptr, read_info, &outImageInfo->width, 75 &outImageInfo->height, &bit_depth, &color_type, 76 &interlace_type, &compression_type, NULL); 77 78 //printf("Image %s:\n", imageName); 79 //printf("color_type=%d, bit_depth=%d, interlace_type=%d, compression_type=%d\n", 80 // color_type, bit_depth, interlace_type, compression_type); 81 82 if (color_type == PNG_COLOR_TYPE_PALETTE) 83 png_set_palette_to_rgb(read_ptr); 84 85 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) 86 png_set_gray_1_2_4_to_8(read_ptr); 87 88 if (png_get_valid(read_ptr, read_info, PNG_INFO_tRNS)) { 89 //printf("Has PNG_INFO_tRNS!\n"); 90 png_set_tRNS_to_alpha(read_ptr); 91 } 92 93 if (bit_depth == 16) 94 png_set_strip_16(read_ptr); 95 96 if ((color_type&PNG_COLOR_MASK_ALPHA) == 0) 97 png_set_add_alpha(read_ptr, 0xFF, PNG_FILLER_AFTER); 98 99 if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 100 png_set_gray_to_rgb(read_ptr); 101 102 png_read_update_info(read_ptr, read_info); 103 104 outImageInfo->rows = (png_bytepp)malloc( 105 outImageInfo->height * png_sizeof(png_bytep)); 106 outImageInfo->allocHeight = outImageInfo->height; 107 outImageInfo->allocRows = outImageInfo->rows; 108 109 png_set_rows(read_ptr, read_info, outImageInfo->rows); 110 111 for (i = 0; i < (int)outImageInfo->height; i++) 112 { 113 outImageInfo->rows[i] = (png_bytep) 114 malloc(png_get_rowbytes(read_ptr, read_info)); 115 } 116 117 png_read_image(read_ptr, outImageInfo->rows); 118 119 png_read_end(read_ptr, read_info); 120 121 NOISY(printf("Image %s: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n", 122 imageName, 123 (int)outImageInfo->width, (int)outImageInfo->height, 124 bit_depth, color_type, 125 interlace_type, compression_type)); 126 127 png_get_IHDR(read_ptr, read_info, &outImageInfo->width, 128 &outImageInfo->height, &bit_depth, &color_type, 129 &interlace_type, &compression_type, NULL); 130 } 131 132 static bool is_tick(png_bytep p, bool transparent, const char** outError) 133 { 134 if (transparent) { 135 if (p[3] == 0) { 136 return false; 137 } 138 if (p[3] != 0xff) { 139 *outError = "Frame pixels must be either solid or transparent (not intermediate alphas)"; 140 return false; 141 } 142 if (p[0] != 0 || p[1] != 0 || p[2] != 0) { 143 *outError = "Ticks in transparent frame must be black"; 144 } 145 return true; 146 } 147 148 if (p[3] != 0xFF) { 149 *outError = "White frame must be a solid color (no alpha)"; 150 } 151 if (p[0] == 0xFF && p[1] == 0xFF && p[2] == 0xFF) { 152 return false; 153 } 154 if (p[0] != 0 || p[1] != 0 || p[2] != 0) { 155 *outError = "Ticks in white frame must be black"; 156 return false; 157 } 158 return true; 159 } 160 161 enum { 162 TICK_START, 163 TICK_INSIDE_1, 164 TICK_OUTSIDE_1 165 }; 166 167 static status_t get_horizontal_ticks( 168 png_bytep row, int width, bool transparent, bool required, 169 int32_t* outLeft, int32_t* outRight, const char** outError, 170 uint8_t* outDivs, bool multipleAllowed) 171 { 172 int i; 173 *outLeft = *outRight = -1; 174 int state = TICK_START; 175 bool found = false; 176 177 for (i=1; i<width-1; i++) { 178 if (is_tick(row+i*4, transparent, outError)) { 179 if (state == TICK_START || 180 (state == TICK_OUTSIDE_1 && multipleAllowed)) { 181 *outLeft = i-1; 182 *outRight = width-2; 183 found = true; 184 if (outDivs != NULL) { 185 *outDivs += 2; 186 } 187 state = TICK_INSIDE_1; 188 } else if (state == TICK_OUTSIDE_1) { 189 *outError = "Can't have more than one marked region along edge"; 190 *outLeft = i; 191 return UNKNOWN_ERROR; 192 } 193 } else if (*outError == NULL) { 194 if (state == TICK_INSIDE_1) { 195 // We're done with this div. Move on to the next. 196 *outRight = i-1; 197 outRight += 2; 198 outLeft += 2; 199 state = TICK_OUTSIDE_1; 200 } 201 } else { 202 *outLeft = i; 203 return UNKNOWN_ERROR; 204 } 205 } 206 207 if (required && !found) { 208 *outError = "No marked region found along edge"; 209 *outLeft = -1; 210 return UNKNOWN_ERROR; 211 } 212 213 return NO_ERROR; 214 } 215 216 static status_t get_vertical_ticks( 217 png_bytepp rows, int offset, int height, bool transparent, bool required, 218 int32_t* outTop, int32_t* outBottom, const char** outError, 219 uint8_t* outDivs, bool multipleAllowed) 220 { 221 int i; 222 *outTop = *outBottom = -1; 223 int state = TICK_START; 224 bool found = false; 225 226 for (i=1; i<height-1; i++) { 227 if (is_tick(rows[i]+offset, transparent, outError)) { 228 if (state == TICK_START || 229 (state == TICK_OUTSIDE_1 && multipleAllowed)) { 230 *outTop = i-1; 231 *outBottom = height-2; 232 found = true; 233 if (outDivs != NULL) { 234 *outDivs += 2; 235 } 236 state = TICK_INSIDE_1; 237 } else if (state == TICK_OUTSIDE_1) { 238 *outError = "Can't have more than one marked region along edge"; 239 *outTop = i; 240 return UNKNOWN_ERROR; 241 } 242 } else if (*outError == NULL) { 243 if (state == TICK_INSIDE_1) { 244 // We're done with this div. Move on to the next. 245 *outBottom = i-1; 246 outTop += 2; 247 outBottom += 2; 248 state = TICK_OUTSIDE_1; 249 } 250 } else { 251 *outTop = i; 252 return UNKNOWN_ERROR; 253 } 254 } 255 256 if (required && !found) { 257 *outError = "No marked region found along edge"; 258 *outTop = -1; 259 return UNKNOWN_ERROR; 260 } 261 262 return NO_ERROR; 263 } 264 265 static uint32_t get_color( 266 png_bytepp rows, int left, int top, int right, int bottom) 267 { 268 png_bytep color = rows[top] + left*4; 269 270 if (left > right || top > bottom) { 271 return Res_png_9patch::TRANSPARENT_COLOR; 272 } 273 274 while (top <= bottom) { 275 for (int i = left; i <= right; i++) { 276 png_bytep p = rows[top]+i*4; 277 if (color[3] == 0) { 278 if (p[3] != 0) { 279 return Res_png_9patch::NO_COLOR; 280 } 281 } else if (p[0] != color[0] || p[1] != color[1] 282 || p[2] != color[2] || p[3] != color[3]) { 283 return Res_png_9patch::NO_COLOR; 284 } 285 } 286 top++; 287 } 288 289 if (color[3] == 0) { 290 return Res_png_9patch::TRANSPARENT_COLOR; 291 } 292 return (color[3]<<24) | (color[0]<<16) | (color[1]<<8) | color[2]; 293 } 294 295 static void select_patch( 296 int which, int front, int back, int size, int* start, int* end) 297 { 298 switch (which) { 299 case 0: 300 *start = 0; 301 *end = front-1; 302 break; 303 case 1: 304 *start = front; 305 *end = back-1; 306 break; 307 case 2: 308 *start = back; 309 *end = size-1; 310 break; 311 } 312 } 313 314 static uint32_t get_color(image_info* image, int hpatch, int vpatch) 315 { 316 int left, right, top, bottom; 317 select_patch( 318 hpatch, image->info9Patch.xDivs[0], image->info9Patch.xDivs[1], 319 image->width, &left, &right); 320 select_patch( 321 vpatch, image->info9Patch.yDivs[0], image->info9Patch.yDivs[1], 322 image->height, &top, &bottom); 323 //printf("Selecting h=%d v=%d: (%d,%d)-(%d,%d)\n", 324 // hpatch, vpatch, left, top, right, bottom); 325 const uint32_t c = get_color(image->rows, left, top, right, bottom); 326 NOISY(printf("Color in (%d,%d)-(%d,%d): #%08x\n", left, top, right, bottom, c)); 327 return c; 328 } 329 330 static status_t do_9patch(const char* imageName, image_info* image) 331 { 332 image->is9Patch = true; 333 334 int W = image->width; 335 int H = image->height; 336 int i, j; 337 338 int maxSizeXDivs = W * sizeof(int32_t); 339 int maxSizeYDivs = H * sizeof(int32_t); 340 int32_t* xDivs = (int32_t*) malloc(maxSizeXDivs); 341 int32_t* yDivs = (int32_t*) malloc(maxSizeYDivs); 342 uint8_t numXDivs = 0; 343 uint8_t numYDivs = 0; 344 int8_t numColors; 345 int numRows; 346 int numCols; 347 int top; 348 int left; 349 int right; 350 int bottom; 351 memset(xDivs, -1, maxSizeXDivs); 352 memset(yDivs, -1, maxSizeYDivs); 353 image->info9Patch.paddingLeft = image->info9Patch.paddingRight = 354 image->info9Patch.paddingTop = image->info9Patch.paddingBottom = -1; 355 356 png_bytep p = image->rows[0]; 357 bool transparent = p[3] == 0; 358 bool hasColor = false; 359 360 const char* errorMsg = NULL; 361 int errorPixel = -1; 362 const char* errorEdge = NULL; 363 364 int colorIndex = 0; 365 366 // Validate size... 367 if (W < 3 || H < 3) { 368 errorMsg = "Image must be at least 3x3 (1x1 without frame) pixels"; 369 goto getout; 370 } 371 372 // Validate frame... 373 if (!transparent && 374 (p[0] != 0xFF || p[1] != 0xFF || p[2] != 0xFF || p[3] != 0xFF)) { 375 errorMsg = "Must have one-pixel frame that is either transparent or white"; 376 goto getout; 377 } 378 379 // Find left and right of sizing areas... 380 if (get_horizontal_ticks(p, W, transparent, true, &xDivs[0], 381 &xDivs[1], &errorMsg, &numXDivs, true) != NO_ERROR) { 382 errorPixel = xDivs[0]; 383 errorEdge = "top"; 384 goto getout; 385 } 386 387 // Find top and bottom of sizing areas... 388 if (get_vertical_ticks(image->rows, 0, H, transparent, true, &yDivs[0], 389 &yDivs[1], &errorMsg, &numYDivs, true) != NO_ERROR) { 390 errorPixel = yDivs[0]; 391 errorEdge = "left"; 392 goto getout; 393 } 394 395 // Find left and right of padding area... 396 if (get_horizontal_ticks(image->rows[H-1], W, transparent, false, &image->info9Patch.paddingLeft, 397 &image->info9Patch.paddingRight, &errorMsg, NULL, false) != NO_ERROR) { 398 errorPixel = image->info9Patch.paddingLeft; 399 errorEdge = "bottom"; 400 goto getout; 401 } 402 403 // Find top and bottom of padding area... 404 if (get_vertical_ticks(image->rows, (W-1)*4, H, transparent, false, &image->info9Patch.paddingTop, 405 &image->info9Patch.paddingBottom, &errorMsg, NULL, false) != NO_ERROR) { 406 errorPixel = image->info9Patch.paddingTop; 407 errorEdge = "right"; 408 goto getout; 409 } 410 411 // Copy patch data into image 412 image->info9Patch.numXDivs = numXDivs; 413 image->info9Patch.numYDivs = numYDivs; 414 image->info9Patch.xDivs = xDivs; 415 image->info9Patch.yDivs = yDivs; 416 417 // If padding is not yet specified, take values from size. 418 if (image->info9Patch.paddingLeft < 0) { 419 image->info9Patch.paddingLeft = xDivs[0]; 420 image->info9Patch.paddingRight = W - 2 - xDivs[1]; 421 } else { 422 // Adjust value to be correct! 423 image->info9Patch.paddingRight = W - 2 - image->info9Patch.paddingRight; 424 } 425 if (image->info9Patch.paddingTop < 0) { 426 image->info9Patch.paddingTop = yDivs[0]; 427 image->info9Patch.paddingBottom = H - 2 - yDivs[1]; 428 } else { 429 // Adjust value to be correct! 430 image->info9Patch.paddingBottom = H - 2 - image->info9Patch.paddingBottom; 431 } 432 433 NOISY(printf("Size ticks for %s: x0=%d, x1=%d, y0=%d, y1=%d\n", imageName, 434 image->info9Patch.xDivs[0], image->info9Patch.xDivs[1], 435 image->info9Patch.yDivs[0], image->info9Patch.yDivs[1])); 436 NOISY(printf("padding ticks for %s: l=%d, r=%d, t=%d, b=%d\n", imageName, 437 image->info9Patch.paddingLeft, image->info9Patch.paddingRight, 438 image->info9Patch.paddingTop, image->info9Patch.paddingBottom)); 439 440 // Remove frame from image. 441 image->rows = (png_bytepp)malloc((H-2) * png_sizeof(png_bytep)); 442 for (i=0; i<(H-2); i++) { 443 image->rows[i] = image->allocRows[i+1]; 444 memmove(image->rows[i], image->rows[i]+4, (W-2)*4); 445 } 446 image->width -= 2; 447 W = image->width; 448 image->height -= 2; 449 H = image->height; 450 451 // Figure out the number of rows and columns in the N-patch 452 numCols = numXDivs + 1; 453 if (xDivs[0] == 0) { // Column 1 is strechable 454 numCols--; 455 } 456 if (xDivs[numXDivs - 1] == W) { 457 numCols--; 458 } 459 numRows = numYDivs + 1; 460 if (yDivs[0] == 0) { // Row 1 is strechable 461 numRows--; 462 } 463 if (yDivs[numYDivs - 1] == H) { 464 numRows--; 465 } 466 467 // Make sure the amount of rows and columns will fit in the number of 468 // colors we can use in the 9-patch format. 469 if (numRows * numCols > 0x7F) { 470 errorMsg = "Too many rows and columns in 9-patch perimeter"; 471 goto getout; 472 } 473 474 numColors = numRows * numCols; 475 image->info9Patch.numColors = numColors; 476 image->info9Patch.colors = (uint32_t*)malloc(numColors * sizeof(uint32_t)); 477 478 // Fill in color information for each patch. 479 480 uint32_t c; 481 top = 0; 482 483 // The first row always starts with the top being at y=0 and the bottom 484 // being either yDivs[1] (if yDivs[0]=0) of yDivs[0]. In the former case 485 // the first row is stretchable along the Y axis, otherwise it is fixed. 486 // The last row always ends with the bottom being bitmap.height and the top 487 // being either yDivs[numYDivs-2] (if yDivs[numYDivs-1]=bitmap.height) or 488 // yDivs[numYDivs-1]. In the former case the last row is stretchable along 489 // the Y axis, otherwise it is fixed. 490 // 491 // The first and last columns are similarly treated with respect to the X 492 // axis. 493 // 494 // The above is to help explain some of the special casing that goes on the 495 // code below. 496 497 // The initial yDiv and whether the first row is considered stretchable or 498 // not depends on whether yDiv[0] was zero or not. 499 for (j = (yDivs[0] == 0 ? 1 : 0); 500 j <= numYDivs && top < H; 501 j++) { 502 if (j == numYDivs) { 503 bottom = H; 504 } else { 505 bottom = yDivs[j]; 506 } 507 left = 0; 508 // The initial xDiv and whether the first column is considered 509 // stretchable or not depends on whether xDiv[0] was zero or not. 510 for (i = xDivs[0] == 0 ? 1 : 0; 511 i <= numXDivs && left < W; 512 i++) { 513 if (i == numXDivs) { 514 right = W; 515 } else { 516 right = xDivs[i]; 517 } 518 c = get_color(image->rows, left, top, right - 1, bottom - 1); 519 image->info9Patch.colors[colorIndex++] = c; 520 NOISY(if (c != Res_png_9patch::NO_COLOR) hasColor = true); 521 left = right; 522 } 523 top = bottom; 524 } 525 526 assert(colorIndex == numColors); 527 528 for (i=0; i<numColors; i++) { 529 if (hasColor) { 530 if (i == 0) printf("Colors in %s:\n ", imageName); 531 printf(" #%08x", image->info9Patch.colors[i]); 532 if (i == numColors - 1) printf("\n"); 533 } 534 } 535 536 image->is9Patch = true; 537 image->info9Patch.deviceToFile(); 538 539 getout: 540 if (errorMsg) { 541 fprintf(stderr, 542 "ERROR: 9-patch image %s malformed.\n" 543 " %s.\n", imageName, errorMsg); 544 if (errorEdge != NULL) { 545 if (errorPixel >= 0) { 546 fprintf(stderr, 547 " Found at pixel #%d along %s edge.\n", errorPixel, errorEdge); 548 } else { 549 fprintf(stderr, 550 " Found along %s edge.\n", errorEdge); 551 } 552 } 553 return UNKNOWN_ERROR; 554 } 555 return NO_ERROR; 556 } 557 558 static void checkNinePatchSerialization(Res_png_9patch* inPatch, void * data) 559 { 560 if (sizeof(void*) != sizeof(int32_t)) { 561 // can't deserialize on a non-32 bit system 562 return; 563 } 564 size_t patchSize = inPatch->serializedSize(); 565 void * newData = malloc(patchSize); 566 memcpy(newData, data, patchSize); 567 Res_png_9patch* outPatch = inPatch->deserialize(newData); 568 // deserialization is done in place, so outPatch == newData 569 assert(outPatch == newData); 570 assert(outPatch->numXDivs == inPatch->numXDivs); 571 assert(outPatch->numYDivs == inPatch->numYDivs); 572 assert(outPatch->paddingLeft == inPatch->paddingLeft); 573 assert(outPatch->paddingRight == inPatch->paddingRight); 574 assert(outPatch->paddingTop == inPatch->paddingTop); 575 assert(outPatch->paddingBottom == inPatch->paddingBottom); 576 for (int i = 0; i < outPatch->numXDivs; i++) { 577 assert(outPatch->xDivs[i] == inPatch->xDivs[i]); 578 } 579 for (int i = 0; i < outPatch->numYDivs; i++) { 580 assert(outPatch->yDivs[i] == inPatch->yDivs[i]); 581 } 582 for (int i = 0; i < outPatch->numColors; i++) { 583 assert(outPatch->colors[i] == inPatch->colors[i]); 584 } 585 free(newData); 586 } 587 588 static bool patch_equals(Res_png_9patch& patch1, Res_png_9patch& patch2) { 589 if (!(patch1.numXDivs == patch2.numXDivs && 590 patch1.numYDivs == patch2.numYDivs && 591 patch1.numColors == patch2.numColors && 592 patch1.paddingLeft == patch2.paddingLeft && 593 patch1.paddingRight == patch2.paddingRight && 594 patch1.paddingTop == patch2.paddingTop && 595 patch1.paddingBottom == patch2.paddingBottom)) { 596 return false; 597 } 598 for (int i = 0; i < patch1.numColors; i++) { 599 if (patch1.colors[i] != patch2.colors[i]) { 600 return false; 601 } 602 } 603 for (int i = 0; i < patch1.numXDivs; i++) { 604 if (patch1.xDivs[i] != patch2.xDivs[i]) { 605 return false; 606 } 607 } 608 for (int i = 0; i < patch1.numYDivs; i++) { 609 if (patch1.yDivs[i] != patch2.yDivs[i]) { 610 return false; 611 } 612 } 613 return true; 614 } 615 616 static void dump_image(int w, int h, png_bytepp rows, int color_type) 617 { 618 int i, j, rr, gg, bb, aa; 619 620 int bpp; 621 if (color_type == PNG_COLOR_TYPE_PALETTE || color_type == PNG_COLOR_TYPE_GRAY) { 622 bpp = 1; 623 } else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { 624 bpp = 2; 625 } else if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) { 626 // We use a padding byte even when there is no alpha 627 bpp = 4; 628 } else { 629 printf("Unknown color type %d.\n", color_type); 630 } 631 632 for (j = 0; j < h; j++) { 633 png_bytep row = rows[j]; 634 for (i = 0; i < w; i++) { 635 rr = row[0]; 636 gg = row[1]; 637 bb = row[2]; 638 aa = row[3]; 639 row += bpp; 640 641 if (i == 0) { 642 printf("Row %d:", j); 643 } 644 switch (bpp) { 645 case 1: 646 printf(" (%d)", rr); 647 break; 648 case 2: 649 printf(" (%d %d", rr, gg); 650 break; 651 case 3: 652 printf(" (%d %d %d)", rr, gg, bb); 653 break; 654 case 4: 655 printf(" (%d %d %d %d)", rr, gg, bb, aa); 656 break; 657 } 658 if (i == (w - 1)) { 659 NOISY(printf("\n")); 660 } 661 } 662 } 663 } 664 665 #define MAX(a,b) ((a)>(b)?(a):(b)) 666 #define ABS(a) ((a)<0?-(a):(a)) 667 668 static void analyze_image(const char *imageName, image_info &imageInfo, int grayscaleTolerance, 669 png_colorp rgbPalette, png_bytep alphaPalette, 670 int *paletteEntries, bool *hasTransparency, int *colorType, 671 png_bytepp outRows) 672 { 673 int w = imageInfo.width; 674 int h = imageInfo.height; 675 int i, j, rr, gg, bb, aa, idx; 676 uint32_t colors[256], col; 677 int num_colors = 0; 678 int maxGrayDeviation = 0; 679 680 bool isOpaque = true; 681 bool isPalette = true; 682 bool isGrayscale = true; 683 684 // Scan the entire image and determine if: 685 // 1. Every pixel has R == G == B (grayscale) 686 // 2. Every pixel has A == 255 (opaque) 687 // 3. There are no more than 256 distinct RGBA colors 688 689 // NOISY(printf("Initial image data:\n")); 690 // dump_image(w, h, imageInfo.rows, PNG_COLOR_TYPE_RGB_ALPHA); 691 692 for (j = 0; j < h; j++) { 693 png_bytep row = imageInfo.rows[j]; 694 png_bytep out = outRows[j]; 695 for (i = 0; i < w; i++) { 696 rr = *row++; 697 gg = *row++; 698 bb = *row++; 699 aa = *row++; 700 701 int odev = maxGrayDeviation; 702 maxGrayDeviation = MAX(ABS(rr - gg), maxGrayDeviation); 703 maxGrayDeviation = MAX(ABS(gg - bb), maxGrayDeviation); 704 maxGrayDeviation = MAX(ABS(bb - rr), maxGrayDeviation); 705 if (maxGrayDeviation > odev) { 706 NOISY(printf("New max dev. = %d at pixel (%d, %d) = (%d %d %d %d)\n", 707 maxGrayDeviation, i, j, rr, gg, bb, aa)); 708 } 709 710 // Check if image is really grayscale 711 if (isGrayscale) { 712 if (rr != gg || rr != bb) { 713 NOISY(printf("Found a non-gray pixel at %d, %d = (%d %d %d %d)\n", 714 i, j, rr, gg, bb, aa)); 715 isGrayscale = false; 716 } 717 } 718 719 // Check if image is really opaque 720 if (isOpaque) { 721 if (aa != 0xff) { 722 NOISY(printf("Found a non-opaque pixel at %d, %d = (%d %d %d %d)\n", 723 i, j, rr, gg, bb, aa)); 724 isOpaque = false; 725 } 726 } 727 728 // Check if image is really <= 256 colors 729 if (isPalette) { 730 col = (uint32_t) ((rr << 24) | (gg << 16) | (bb << 8) | aa); 731 bool match = false; 732 for (idx = 0; idx < num_colors; idx++) { 733 if (colors[idx] == col) { 734 match = true; 735 break; 736 } 737 } 738 739 // Write the palette index for the pixel to outRows optimistically 740 // We might overwrite it later if we decide to encode as gray or 741 // gray + alpha 742 *out++ = idx; 743 if (!match) { 744 if (num_colors == 256) { 745 NOISY(printf("Found 257th color at %d, %d\n", i, j)); 746 isPalette = false; 747 } else { 748 colors[num_colors++] = col; 749 } 750 } 751 } 752 } 753 } 754 755 *paletteEntries = 0; 756 *hasTransparency = !isOpaque; 757 int bpp = isOpaque ? 3 : 4; 758 int paletteSize = w * h + bpp * num_colors; 759 760 NOISY(printf("isGrayscale = %s\n", isGrayscale ? "true" : "false")); 761 NOISY(printf("isOpaque = %s\n", isOpaque ? "true" : "false")); 762 NOISY(printf("isPalette = %s\n", isPalette ? "true" : "false")); 763 NOISY(printf("Size w/ palette = %d, gray+alpha = %d, rgb(a) = %d\n", 764 paletteSize, 2 * w * h, bpp * w * h)); 765 NOISY(printf("Max gray deviation = %d, tolerance = %d\n", maxGrayDeviation, grayscaleTolerance)); 766 767 // Choose the best color type for the image. 768 // 1. Opaque gray - use COLOR_TYPE_GRAY at 1 byte/pixel 769 // 2. Gray + alpha - use COLOR_TYPE_PALETTE if the number of distinct combinations 770 // is sufficiently small, otherwise use COLOR_TYPE_GRAY_ALPHA 771 // 3. RGB(A) - use COLOR_TYPE_PALETTE if the number of distinct colors is sufficiently 772 // small, otherwise use COLOR_TYPE_RGB{_ALPHA} 773 if (isGrayscale) { 774 if (isOpaque) { 775 *colorType = PNG_COLOR_TYPE_GRAY; // 1 byte/pixel 776 } else { 777 // Use a simple heuristic to determine whether using a palette will 778 // save space versus using gray + alpha for each pixel. 779 // This doesn't take into account chunk overhead, filtering, LZ 780 // compression, etc. 781 if (isPalette && (paletteSize < 2 * w * h)) { 782 *colorType = PNG_COLOR_TYPE_PALETTE; // 1 byte/pixel + 4 bytes/color 783 } else { 784 *colorType = PNG_COLOR_TYPE_GRAY_ALPHA; // 2 bytes per pixel 785 } 786 } 787 } else if (isPalette && (paletteSize < bpp * w * h)) { 788 *colorType = PNG_COLOR_TYPE_PALETTE; 789 } else { 790 if (maxGrayDeviation <= grayscaleTolerance) { 791 printf("%s: forcing image to gray (max deviation = %d)\n", imageName, maxGrayDeviation); 792 *colorType = isOpaque ? PNG_COLOR_TYPE_GRAY : PNG_COLOR_TYPE_GRAY_ALPHA; 793 } else { 794 *colorType = isOpaque ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA; 795 } 796 } 797 798 // Perform postprocessing of the image or palette data based on the final 799 // color type chosen 800 801 if (*colorType == PNG_COLOR_TYPE_PALETTE) { 802 // Create separate RGB and Alpha palettes and set the number of colors 803 *paletteEntries = num_colors; 804 805 // Create the RGB and alpha palettes 806 for (int idx = 0; idx < num_colors; idx++) { 807 col = colors[idx]; 808 rgbPalette[idx].red = (png_byte) ((col >> 24) & 0xff); 809 rgbPalette[idx].green = (png_byte) ((col >> 16) & 0xff); 810 rgbPalette[idx].blue = (png_byte) ((col >> 8) & 0xff); 811 alphaPalette[idx] = (png_byte) (col & 0xff); 812 } 813 } else if (*colorType == PNG_COLOR_TYPE_GRAY || *colorType == PNG_COLOR_TYPE_GRAY_ALPHA) { 814 // If the image is gray or gray + alpha, compact the pixels into outRows 815 for (j = 0; j < h; j++) { 816 png_bytep row = imageInfo.rows[j]; 817 png_bytep out = outRows[j]; 818 for (i = 0; i < w; i++) { 819 rr = *row++; 820 gg = *row++; 821 bb = *row++; 822 aa = *row++; 823 824 if (isGrayscale) { 825 *out++ = rr; 826 } else { 827 *out++ = (png_byte) (rr * 0.2126f + gg * 0.7152f + bb * 0.0722f); 828 } 829 if (!isOpaque) { 830 *out++ = aa; 831 } 832 } 833 } 834 } 835 } 836 837 838 static void write_png(const char* imageName, 839 png_structp write_ptr, png_infop write_info, 840 image_info& imageInfo, int grayscaleTolerance) 841 { 842 bool optimize = true; 843 png_uint_32 width, height; 844 int color_type; 845 int bit_depth, interlace_type, compression_type; 846 int i; 847 848 png_unknown_chunk unknowns[1]; 849 unknowns[0].data = NULL; 850 851 png_bytepp outRows = (png_bytepp) malloc((int) imageInfo.height * png_sizeof(png_bytep)); 852 if (outRows == (png_bytepp) 0) { 853 printf("Can't allocate output buffer!\n"); 854 exit(1); 855 } 856 for (i = 0; i < (int) imageInfo.height; i++) { 857 outRows[i] = (png_bytep) malloc(2 * (int) imageInfo.width); 858 if (outRows[i] == (png_bytep) 0) { 859 printf("Can't allocate output buffer!\n"); 860 exit(1); 861 } 862 } 863 864 png_set_compression_level(write_ptr, Z_BEST_COMPRESSION); 865 866 NOISY(printf("Writing image %s: w = %d, h = %d\n", imageName, 867 (int) imageInfo.width, (int) imageInfo.height)); 868 869 png_color rgbPalette[256]; 870 png_byte alphaPalette[256]; 871 bool hasTransparency; 872 int paletteEntries; 873 874 analyze_image(imageName, imageInfo, grayscaleTolerance, rgbPalette, alphaPalette, 875 &paletteEntries, &hasTransparency, &color_type, outRows); 876 877 // If the image is a 9-patch, we need to preserve it as a ARGB file to make 878 // sure the pixels will not be pre-dithered/clamped until we decide they are 879 if (imageInfo.is9Patch && (color_type == PNG_COLOR_TYPE_RGB || 880 color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_PALETTE)) { 881 color_type = PNG_COLOR_TYPE_RGB_ALPHA; 882 } 883 884 switch (color_type) { 885 case PNG_COLOR_TYPE_PALETTE: 886 NOISY(printf("Image %s has %d colors%s, using PNG_COLOR_TYPE_PALETTE\n", 887 imageName, paletteEntries, 888 hasTransparency ? " (with alpha)" : "")); 889 break; 890 case PNG_COLOR_TYPE_GRAY: 891 NOISY(printf("Image %s is opaque gray, using PNG_COLOR_TYPE_GRAY\n", imageName)); 892 break; 893 case PNG_COLOR_TYPE_GRAY_ALPHA: 894 NOISY(printf("Image %s is gray + alpha, using PNG_COLOR_TYPE_GRAY_ALPHA\n", imageName)); 895 break; 896 case PNG_COLOR_TYPE_RGB: 897 NOISY(printf("Image %s is opaque RGB, using PNG_COLOR_TYPE_RGB\n", imageName)); 898 break; 899 case PNG_COLOR_TYPE_RGB_ALPHA: 900 NOISY(printf("Image %s is RGB + alpha, using PNG_COLOR_TYPE_RGB_ALPHA\n", imageName)); 901 break; 902 } 903 904 png_set_IHDR(write_ptr, write_info, imageInfo.width, imageInfo.height, 905 8, color_type, PNG_INTERLACE_NONE, 906 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); 907 908 if (color_type == PNG_COLOR_TYPE_PALETTE) { 909 png_set_PLTE(write_ptr, write_info, rgbPalette, paletteEntries); 910 if (hasTransparency) { 911 png_set_tRNS(write_ptr, write_info, alphaPalette, paletteEntries, (png_color_16p) 0); 912 } 913 png_set_filter(write_ptr, 0, PNG_NO_FILTERS); 914 } else { 915 png_set_filter(write_ptr, 0, PNG_ALL_FILTERS); 916 } 917 918 if (imageInfo.is9Patch) { 919 NOISY(printf("Adding 9-patch info...\n")); 920 strcpy((char*)unknowns[0].name, "npTc"); 921 unknowns[0].data = (png_byte*)imageInfo.info9Patch.serialize(); 922 unknowns[0].size = imageInfo.info9Patch.serializedSize(); 923 // TODO: remove the check below when everything works 924 checkNinePatchSerialization(&imageInfo.info9Patch, unknowns[0].data); 925 png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS, 926 (png_byte*)"npTc", 1); 927 png_set_unknown_chunks(write_ptr, write_info, unknowns, 1); 928 // XXX I can't get this to work without forcibly changing 929 // the location to what I want... which apparently is supposed 930 // to be a private API, but everything else I have tried results 931 // in the location being set to what I -last- wrote so I never 932 // get written. :p 933 png_set_unknown_chunk_location(write_ptr, write_info, 0, PNG_HAVE_PLTE); 934 } 935 936 png_write_info(write_ptr, write_info); 937 938 png_bytepp rows; 939 if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) { 940 png_set_filler(write_ptr, 0, PNG_FILLER_AFTER); 941 rows = imageInfo.rows; 942 } else { 943 rows = outRows; 944 } 945 png_write_image(write_ptr, rows); 946 947 // NOISY(printf("Final image data:\n")); 948 // dump_image(imageInfo.width, imageInfo.height, rows, color_type); 949 950 png_write_end(write_ptr, write_info); 951 952 for (i = 0; i < (int) imageInfo.height; i++) { 953 free(outRows[i]); 954 } 955 free(outRows); 956 free(unknowns[0].data); 957 958 png_get_IHDR(write_ptr, write_info, &width, &height, 959 &bit_depth, &color_type, &interlace_type, 960 &compression_type, NULL); 961 962 NOISY(printf("Image written: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n", 963 (int)width, (int)height, bit_depth, color_type, interlace_type, 964 compression_type)); 965 } 966 967 status_t preProcessImage(Bundle* bundle, const sp<AaptAssets>& assets, 968 const sp<AaptFile>& file, String8* outNewLeafName) 969 { 970 String8 ext(file->getPath().getPathExtension()); 971 972 // We currently only process PNG images. 973 if (strcmp(ext.string(), ".png") != 0) { 974 return NO_ERROR; 975 } 976 977 // Example of renaming a file: 978 //*outNewLeafName = file->getPath().getBasePath().getFileName(); 979 //outNewLeafName->append(".nupng"); 980 981 String8 printableName(file->getPrintableSource()); 982 983 png_structp read_ptr = NULL; 984 png_infop read_info = NULL; 985 FILE* fp; 986 987 image_info imageInfo; 988 989 png_structp write_ptr = NULL; 990 png_infop write_info = NULL; 991 992 status_t error = UNKNOWN_ERROR; 993 994 const size_t nameLen = file->getPath().length(); 995 996 fp = fopen(file->getSourceFile().string(), "rb"); 997 if (fp == NULL) { 998 fprintf(stderr, "%s: ERROR: Unable to open PNG file\n", printableName.string()); 999 goto bail; 1000 } 1001 1002 read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, (png_error_ptr)NULL, 1003 (png_error_ptr)NULL); 1004 if (!read_ptr) { 1005 goto bail; 1006 } 1007 1008 read_info = png_create_info_struct(read_ptr); 1009 if (!read_info) { 1010 goto bail; 1011 } 1012 1013 if (setjmp(png_jmpbuf(read_ptr))) { 1014 goto bail; 1015 } 1016 1017 png_init_io(read_ptr, fp); 1018 1019 read_png(printableName.string(), read_ptr, read_info, &imageInfo); 1020 1021 if (nameLen > 6) { 1022 const char* name = file->getPath().string(); 1023 if (name[nameLen-5] == '9' && name[nameLen-6] == '.') { 1024 if (do_9patch(printableName.string(), &imageInfo) != NO_ERROR) { 1025 goto bail; 1026 } 1027 } 1028 } 1029 1030 write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, (png_error_ptr)NULL, 1031 (png_error_ptr)NULL); 1032 if (!write_ptr) 1033 { 1034 goto bail; 1035 } 1036 1037 write_info = png_create_info_struct(write_ptr); 1038 if (!write_info) 1039 { 1040 goto bail; 1041 } 1042 1043 png_set_write_fn(write_ptr, (void*)file.get(), 1044 png_write_aapt_file, png_flush_aapt_file); 1045 1046 if (setjmp(png_jmpbuf(write_ptr))) 1047 { 1048 goto bail; 1049 } 1050 1051 write_png(printableName.string(), write_ptr, write_info, imageInfo, 1052 bundle->getGrayscaleTolerance()); 1053 1054 error = NO_ERROR; 1055 1056 if (bundle->getVerbose()) { 1057 fseek(fp, 0, SEEK_END); 1058 size_t oldSize = (size_t)ftell(fp); 1059 size_t newSize = file->getSize(); 1060 float factor = ((float)newSize)/oldSize; 1061 int percent = (int)(factor*100); 1062 printf(" (processed image %s: %d%% size of source)\n", printableName.string(), percent); 1063 } 1064 1065 bail: 1066 if (read_ptr) { 1067 png_destroy_read_struct(&read_ptr, &read_info, (png_infopp)NULL); 1068 } 1069 if (fp) { 1070 fclose(fp); 1071 } 1072 if (write_ptr) { 1073 png_destroy_write_struct(&write_ptr, &write_info); 1074 } 1075 1076 if (error != NO_ERROR) { 1077 fprintf(stderr, "ERROR: Failure processing PNG image %s\n", 1078 file->getPrintableSource().string()); 1079 } 1080 return error; 1081 } 1082 1083 1084 1085 status_t postProcessImage(const sp<AaptAssets>& assets, 1086 ResourceTable* table, const sp<AaptFile>& file) 1087 { 1088 String8 ext(file->getPath().getPathExtension()); 1089 1090 // At this point, now that we have all the resource data, all we need to 1091 // do is compile XML files. 1092 if (strcmp(ext.string(), ".xml") == 0) { 1093 return compileXmlFile(assets, file, table); 1094 } 1095 1096 return NO_ERROR; 1097 } 1098
