Images.cpp revision b798689749c64baba81f02e10cf2157c747d6b46
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 18static void 19png_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 28static void 29png_flush_aapt_file(png_structp png_ptr) 30{ 31} 32 33// This holds an image as 8bpp RGBA. 34struct image_info 35{ 36 image_info() : rows(NULL), hasTransparency(true), 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 } 48 49 png_uint_32 width; 50 png_uint_32 height; 51 png_bytepp rows; 52 53 bool hasTransparency; 54 55 // 9-patch info. 56 bool is9Patch; 57 Res_png_9patch info9Patch; 58 59 png_uint_32 allocHeight; 60 png_bytepp allocRows; 61}; 62 63static void read_png(const char* imageName, 64 png_structp read_ptr, png_infop read_info, 65 image_info* outImageInfo) 66{ 67 int color_type; 68 int bit_depth, interlace_type, compression_type; 69 int i; 70 71 png_read_info(read_ptr, read_info); 72 73 png_get_IHDR(read_ptr, read_info, &outImageInfo->width, 74 &outImageInfo->height, &bit_depth, &color_type, 75 &interlace_type, &compression_type, NULL); 76 77 //printf("Image %s:\n", imageName); 78 //printf("color_type=%d, bit_depth=%d, interlace_type=%d, compression_type=%d\n", 79 // color_type, bit_depth, interlace_type, compression_type); 80 81 if (color_type == PNG_COLOR_TYPE_PALETTE) 82 png_set_palette_to_rgb(read_ptr); 83 84 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) 85 png_set_gray_1_2_4_to_8(read_ptr); 86 87 if (png_get_valid(read_ptr, read_info, PNG_INFO_tRNS)) { 88 //printf("Has PNG_INFO_tRNS!\n"); 89 png_set_tRNS_to_alpha(read_ptr); 90 } 91 92 if (bit_depth == 16) 93 png_set_strip_16(read_ptr); 94 95 if ((color_type&PNG_COLOR_MASK_ALPHA) == 0) 96 png_set_add_alpha(read_ptr, 0xFF, PNG_FILLER_AFTER); 97 98 if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 99 png_set_gray_to_rgb(read_ptr); 100 101 png_read_update_info(read_ptr, read_info); 102 103 outImageInfo->rows = (png_bytepp)malloc( 104 outImageInfo->height * png_sizeof(png_bytep)); 105 outImageInfo->allocHeight = outImageInfo->height; 106 outImageInfo->allocRows = outImageInfo->rows; 107 108 png_set_rows(read_ptr, read_info, outImageInfo->rows); 109 110 for (i = 0; i < (int)outImageInfo->height; i++) 111 { 112 outImageInfo->rows[i] = (png_bytep) 113 malloc(png_get_rowbytes(read_ptr, read_info)); 114 } 115 116 png_read_image(read_ptr, outImageInfo->rows); 117 118 png_read_end(read_ptr, read_info); 119 120 NOISY(printf("Image %s: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n", 121 imageName, 122 (int)outImageInfo->width, (int)outImageInfo->height, 123 bit_depth, color_type, 124 interlace_type, compression_type)); 125 126 png_get_IHDR(read_ptr, read_info, &outImageInfo->width, 127 &outImageInfo->height, &bit_depth, &color_type, 128 &interlace_type, &compression_type, NULL); 129} 130 131static bool is_tick(png_bytep p, bool transparent, const char** outError) 132{ 133 if (transparent) { 134 if (p[3] == 0) { 135 return false; 136 } 137 if (p[3] != 0xff) { 138 *outError = "Frame pixels must be either solid or transparent (not intermediate alphas)"; 139 return false; 140 } 141 if (p[0] != 0 || p[1] != 0 || p[2] != 0) { 142 *outError = "Ticks in transparent frame must be black"; 143 } 144 return true; 145 } 146 147 if (p[3] != 0xFF) { 148 *outError = "White frame must be a solid color (no alpha)"; 149 } 150 if (p[0] == 0xFF && p[1] == 0xFF && p[2] == 0xFF) { 151 return false; 152 } 153 if (p[0] != 0 || p[1] != 0 || p[2] != 0) { 154 *outError = "Ticks in white frame must be black"; 155 return false; 156 } 157 return true; 158} 159 160enum { 161 TICK_START, 162 TICK_INSIDE_1, 163 TICK_OUTSIDE_1 164}; 165 166static status_t get_horizontal_ticks( 167 png_bytep row, int width, bool transparent, bool required, 168 int32_t* outLeft, int32_t* outRight, const char** outError, 169 uint8_t* outDivs, bool multipleAllowed) 170{ 171 int i; 172 *outLeft = *outRight = -1; 173 int state = TICK_START; 174 bool found = false; 175 176 for (i=1; i<width-1; i++) { 177 if (is_tick(row+i*4, transparent, outError)) { 178 if (state == TICK_START || 179 (state == TICK_OUTSIDE_1 && multipleAllowed)) { 180 *outLeft = i-1; 181 *outRight = width-2; 182 found = true; 183 if (outDivs != NULL) { 184 *outDivs += 2; 185 } 186 state = TICK_INSIDE_1; 187 } else if (state == TICK_OUTSIDE_1) { 188 *outError = "Can't have more than one marked region along edge"; 189 *outLeft = i; 190 return UNKNOWN_ERROR; 191 } 192 } else if (*outError == NULL) { 193 if (state == TICK_INSIDE_1) { 194 // We're done with this div. Move on to the next. 195 *outRight = i-1; 196 outRight += 2; 197 outLeft += 2; 198 state = TICK_OUTSIDE_1; 199 } 200 } else { 201 *outLeft = i; 202 return UNKNOWN_ERROR; 203 } 204 } 205 206 if (required && !found) { 207 *outError = "No marked region found along edge"; 208 *outLeft = -1; 209 return UNKNOWN_ERROR; 210 } 211 212 return NO_ERROR; 213} 214 215static status_t get_vertical_ticks( 216 png_bytepp rows, int offset, int height, bool transparent, bool required, 217 int32_t* outTop, int32_t* outBottom, const char** outError, 218 uint8_t* outDivs, bool multipleAllowed) 219{ 220 int i; 221 *outTop = *outBottom = -1; 222 int state = TICK_START; 223 bool found = false; 224 225 for (i=1; i<height-1; i++) { 226 if (is_tick(rows[i]+offset, transparent, outError)) { 227 if (state == TICK_START || 228 (state == TICK_OUTSIDE_1 && multipleAllowed)) { 229 *outTop = i-1; 230 *outBottom = height-2; 231 found = true; 232 if (outDivs != NULL) { 233 *outDivs += 2; 234 } 235 state = TICK_INSIDE_1; 236 } else if (state == TICK_OUTSIDE_1) { 237 *outError = "Can't have more than one marked region along edge"; 238 *outTop = i; 239 return UNKNOWN_ERROR; 240 } 241 } else if (*outError == NULL) { 242 if (state == TICK_INSIDE_1) { 243 // We're done with this div. Move on to the next. 244 *outBottom = i-1; 245 outTop += 2; 246 outBottom += 2; 247 state = TICK_OUTSIDE_1; 248 } 249 } else { 250 *outTop = i; 251 return UNKNOWN_ERROR; 252 } 253 } 254 255 if (required && !found) { 256 *outError = "No marked region found along edge"; 257 *outTop = -1; 258 return UNKNOWN_ERROR; 259 } 260 261 return NO_ERROR; 262} 263 264static uint32_t get_color( 265 png_bytepp rows, int left, int top, int right, int bottom) 266{ 267 png_bytep color = rows[top] + left*4; 268 269 if (left > right || top > bottom) { 270 return Res_png_9patch::TRANSPARENT_COLOR; 271 } 272 273 while (top <= bottom) { 274 for (int i = left; i <= right; i++) { 275 png_bytep p = rows[top]+i*4; 276 if (color[3] == 0) { 277 if (p[3] != 0) { 278 return Res_png_9patch::NO_COLOR; 279 } 280 } else if (p[0] != color[0] || p[1] != color[1] 281 || p[2] != color[2] || p[3] != color[3]) { 282 return Res_png_9patch::NO_COLOR; 283 } 284 } 285 top++; 286 } 287 288 if (color[3] == 0) { 289 return Res_png_9patch::TRANSPARENT_COLOR; 290 } 291 return (color[3]<<24) | (color[0]<<16) | (color[1]<<8) | color[2]; 292} 293 294static void select_patch( 295 int which, int front, int back, int size, int* start, int* end) 296{ 297 switch (which) { 298 case 0: 299 *start = 0; 300 *end = front-1; 301 break; 302 case 1: 303 *start = front; 304 *end = back-1; 305 break; 306 case 2: 307 *start = back; 308 *end = size-1; 309 break; 310 } 311} 312 313static uint32_t get_color(image_info* image, int hpatch, int vpatch) 314{ 315 int left, right, top, bottom; 316 select_patch( 317 hpatch, image->info9Patch.xDivs[0], image->info9Patch.xDivs[1], 318 image->width, &left, &right); 319 select_patch( 320 vpatch, image->info9Patch.yDivs[0], image->info9Patch.yDivs[1], 321 image->height, &top, &bottom); 322 //printf("Selecting h=%d v=%d: (%d,%d)-(%d,%d)\n", 323 // hpatch, vpatch, left, top, right, bottom); 324 const uint32_t c = get_color(image->rows, left, top, right, bottom); 325 NOISY(printf("Color in (%d,%d)-(%d,%d): #%08x\n", left, top, right, bottom, c)); 326 return c; 327} 328 329static void examine_image(image_info* image) 330{ 331 bool hasTrans = false; 332 for (int i=0; i<(int)image->height && !hasTrans; i++) { 333 png_bytep p = image->rows[i]; 334 for (int j=0; j<(int)image->width; j++) { 335 if (p[(j*4)+3] != 0xFF) { 336 hasTrans = true; 337 break; 338 } 339 } 340 } 341 342 image->hasTransparency = hasTrans; 343} 344 345static status_t do_9patch(const char* imageName, image_info* image) 346{ 347 image->is9Patch = true; 348 349 int W = image->width; 350 int H = image->height; 351 int i, j; 352 353 int maxSizeXDivs = (W / 2 + 1) * sizeof(int32_t); 354 int maxSizeYDivs = (H / 2 + 1) * sizeof(int32_t); 355 int32_t* xDivs = (int32_t*) malloc(maxSizeXDivs); 356 int32_t* yDivs = (int32_t*) malloc(maxSizeYDivs); 357 uint8_t numXDivs = 0; 358 uint8_t numYDivs = 0; 359 int8_t numColors; 360 int numRows; 361 int numCols; 362 int top; 363 int left; 364 int right; 365 int bottom; 366 memset(xDivs, -1, maxSizeXDivs); 367 memset(yDivs, -1, maxSizeYDivs); 368 image->info9Patch.paddingLeft = image->info9Patch.paddingRight = 369 image->info9Patch.paddingTop = image->info9Patch.paddingBottom = -1; 370 371 png_bytep p = image->rows[0]; 372 bool transparent = p[3] == 0; 373 bool hasColor = false; 374 375 const char* errorMsg = NULL; 376 int errorPixel = -1; 377 const char* errorEdge = ""; 378 379 int colorIndex = 0; 380 381 // Validate size... 382 if (W < 3 || H < 3) { 383 errorMsg = "Image must be at least 3x3 (1x1 without frame) pixels"; 384 goto getout; 385 } 386 387 // Validate frame... 388 if (!transparent && 389 (p[0] != 0xFF || p[1] != 0xFF || p[2] != 0xFF || p[3] != 0xFF)) { 390 errorMsg = "Must have one-pixel frame that is either transparent or white"; 391 goto getout; 392 } 393 394 // Find left and right of sizing areas... 395 if (get_horizontal_ticks(p, W, transparent, true, &xDivs[0], 396 &xDivs[1], &errorMsg, &numXDivs, true) != NO_ERROR) { 397 errorPixel = xDivs[0]; 398 errorEdge = "top"; 399 goto getout; 400 } 401 402 // Find top and bottom of sizing areas... 403 if (get_vertical_ticks(image->rows, 0, H, transparent, true, &yDivs[0], 404 &yDivs[1], &errorMsg, &numYDivs, true) != NO_ERROR) { 405 errorPixel = yDivs[0]; 406 errorEdge = "left"; 407 goto getout; 408 } 409 410 // Find left and right of padding area... 411 if (get_horizontal_ticks(image->rows[H-1], W, transparent, false, &image->info9Patch.paddingLeft, 412 &image->info9Patch.paddingRight, &errorMsg, NULL, false) != NO_ERROR) { 413 errorPixel = image->info9Patch.paddingLeft; 414 errorEdge = "bottom"; 415 goto getout; 416 } 417 418 // Find top and bottom of padding area... 419 if (get_vertical_ticks(image->rows, (W-1)*4, H, transparent, false, &image->info9Patch.paddingTop, 420 &image->info9Patch.paddingBottom, &errorMsg, NULL, false) != NO_ERROR) { 421 errorPixel = image->info9Patch.paddingTop; 422 errorEdge = "right"; 423 goto getout; 424 } 425 426 // Copy patch data into image 427 image->info9Patch.numXDivs = numXDivs; 428 image->info9Patch.numYDivs = numYDivs; 429 image->info9Patch.xDivs = xDivs; 430 image->info9Patch.yDivs = yDivs; 431 432 // If padding is not yet specified, take values from size. 433 if (image->info9Patch.paddingLeft < 0) { 434 image->info9Patch.paddingLeft = xDivs[0]; 435 image->info9Patch.paddingRight = W - 2 - xDivs[1]; 436 } else { 437 // Adjust value to be correct! 438 image->info9Patch.paddingRight = W - 2 - image->info9Patch.paddingRight; 439 } 440 if (image->info9Patch.paddingTop < 0) { 441 image->info9Patch.paddingTop = yDivs[0]; 442 image->info9Patch.paddingBottom = H - 2 - yDivs[1]; 443 } else { 444 // Adjust value to be correct! 445 image->info9Patch.paddingBottom = H - 2 - image->info9Patch.paddingBottom; 446 } 447 448 NOISY(printf("Size ticks for %s: x0=%d, x1=%d, y0=%d, y1=%d\n", imageName, 449 image->info9Patch.xDivs[0], image->info9Patch.xDivs[1], 450 image->info9Patch.yDivs[0], image->info9Patch.yDivs[1])); 451 NOISY(printf("padding ticks for %s: l=%d, r=%d, t=%d, b=%d\n", imageName, 452 image->info9Patch.paddingLeft, image->info9Patch.paddingRight, 453 image->info9Patch.paddingTop, image->info9Patch.paddingBottom)); 454 455 // Remove frame from image. 456 image->rows = (png_bytepp)malloc((H-2) * png_sizeof(png_bytep)); 457 for (i=0; i<(H-2); i++) { 458 image->rows[i] = image->allocRows[i+1]; 459 memmove(image->rows[i], image->rows[i]+4, (W-2)*4); 460 } 461 image->width -= 2; 462 W = image->width; 463 image->height -= 2; 464 H = image->height; 465 466 // Figure out the number of rows and columns in the N-patch 467 numCols = numXDivs + 1; 468 if (xDivs[0] == 0) { // Column 1 is strechable 469 numCols--; 470 } 471 if (xDivs[numXDivs - 1] == W) { 472 numCols--; 473 } 474 numRows = numYDivs + 1; 475 if (yDivs[0] == 0) { // Row 1 is strechable 476 numRows--; 477 } 478 if (yDivs[numYDivs - 1] == H) { 479 numRows--; 480 } 481 numColors = numRows * numCols; 482 image->info9Patch.numColors = numColors; 483 image->info9Patch.colors = (uint32_t*)malloc(numColors * sizeof(uint32_t)); 484 485 // Fill in color information for each patch. 486 487 uint32_t c; 488 top = 0; 489 490 // The first row always starts with the top being at y=0 and the bottom 491 // being either yDivs[1] (if yDivs[0]=0) of yDivs[0]. In the former case 492 // the first row is stretchable along the Y axis, otherwise it is fixed. 493 // The last row always ends with the bottom being bitmap.height and the top 494 // being either yDivs[numYDivs-2] (if yDivs[numYDivs-1]=bitmap.height) or 495 // yDivs[numYDivs-1]. In the former case the last row is stretchable along 496 // the Y axis, otherwise it is fixed. 497 // 498 // The first and last columns are similarly treated with respect to the X 499 // axis. 500 // 501 // The above is to help explain some of the special casing that goes on the 502 // code below. 503 504 // The initial yDiv and whether the first row is considered stretchable or 505 // not depends on whether yDiv[0] was zero or not. 506 for (j = (yDivs[0] == 0 ? 1 : 0); 507 j <= numYDivs && top < H; 508 j++) { 509 if (j == numYDivs) { 510 bottom = H; 511 } else { 512 bottom = yDivs[j]; 513 } 514 left = 0; 515 // The initial xDiv and whether the first column is considered 516 // stretchable or not depends on whether xDiv[0] was zero or not. 517 for (i = xDivs[0] == 0 ? 1 : 0; 518 i <= numXDivs && left < W; 519 i++) { 520 if (i == numXDivs) { 521 right = W; 522 } else { 523 right = xDivs[i]; 524 } 525 c = get_color(image->rows, left, top, right - 1, bottom - 1); 526 image->info9Patch.colors[colorIndex++] = c; 527 NOISY(if (c != Res_png_9patch::NO_COLOR) hasColor = true); 528 left = right; 529 } 530 top = bottom; 531 } 532 533 assert(colorIndex == numColors); 534 535 for (i=0; i<numColors; i++) { 536 if (hasColor) { 537 if (i == 0) printf("Colors in %s:\n ", imageName); 538 printf(" #%08x", image->info9Patch.colors[i]); 539 if (i == numColors - 1) printf("\n"); 540 } 541 } 542 543 image->is9Patch = true; 544 image->info9Patch.deviceToFile(); 545 546getout: 547 if (errorMsg) { 548 fprintf(stderr, 549 "ERROR: 9-patch image %s malformed.\n" 550 " %s.\n", imageName, errorMsg); 551 if (errorPixel >= 0) { 552 fprintf(stderr, 553 " Found at pixel #%d along %s edge.\n", errorPixel, errorEdge); 554 } else { 555 fprintf(stderr, 556 " Found along %s edge.\n", errorEdge); 557 } 558 return UNKNOWN_ERROR; 559 } 560 return NO_ERROR; 561} 562 563static void checkNinePatchSerialization(Res_png_9patch* inPatch, void * data) 564{ 565 if (sizeof(void*) != sizeof(int32_t)) { 566 // can't deserialize on a non-32 bit system 567 return; 568 } 569 size_t patchSize = inPatch->serializedSize(); 570 void * newData = malloc(patchSize); 571 memcpy(newData, data, patchSize); 572 Res_png_9patch* outPatch = inPatch->deserialize(newData); 573 // deserialization is done in place, so outPatch == newData 574 assert(outPatch == newData); 575 assert(outPatch->numXDivs == inPatch->numXDivs); 576 assert(outPatch->numYDivs == inPatch->numYDivs); 577 assert(outPatch->paddingLeft == inPatch->paddingLeft); 578 assert(outPatch->paddingRight == inPatch->paddingRight); 579 assert(outPatch->paddingTop == inPatch->paddingTop); 580 assert(outPatch->paddingBottom == inPatch->paddingBottom); 581 for (int i = 0; i < outPatch->numXDivs; i++) { 582 assert(outPatch->xDivs[i] == inPatch->xDivs[i]); 583 } 584 for (int i = 0; i < outPatch->numYDivs; i++) { 585 assert(outPatch->yDivs[i] == inPatch->yDivs[i]); 586 } 587 for (int i = 0; i < outPatch->numColors; i++) { 588 assert(outPatch->colors[i] == inPatch->colors[i]); 589 } 590 free(newData); 591} 592 593static bool patch_equals(Res_png_9patch& patch1, Res_png_9patch& patch2) { 594 if (!(patch1.numXDivs == patch2.numXDivs && 595 patch1.numYDivs == patch2.numYDivs && 596 patch1.numColors == patch2.numColors && 597 patch1.paddingLeft == patch2.paddingLeft && 598 patch1.paddingRight == patch2.paddingRight && 599 patch1.paddingTop == patch2.paddingTop && 600 patch1.paddingBottom == patch2.paddingBottom)) { 601 return false; 602 } 603 for (int i = 0; i < patch1.numColors; i++) { 604 if (patch1.colors[i] != patch2.colors[i]) { 605 return false; 606 } 607 } 608 for (int i = 0; i < patch1.numXDivs; i++) { 609 if (patch1.xDivs[i] != patch2.xDivs[i]) { 610 return false; 611 } 612 } 613 for (int i = 0; i < patch1.numYDivs; i++) { 614 if (patch1.yDivs[i] != patch2.yDivs[i]) { 615 return false; 616 } 617 } 618 return true; 619} 620 621 622static void analyze_image(image_info &imageInfo, png_colorp rgbPalette, png_bytep alphaPalette, 623 int *paletteEntries, bool *hasTransparency, int *colorType, 624 png_bytepp outRows) 625{ 626 int w = imageInfo.width; 627 int h = imageInfo.height; 628 bool trans = imageInfo.hasTransparency; 629 int i, j, rr, gg, bb, aa, idx; 630 uint32_t colors[256], col; 631 int num_colors = 0; 632 633 bool isOpaque = true; 634 bool isPalette = true; 635 bool isGrayscale = true; 636 637 // Scan the entire image and determine if: 638 // 1. Every pixel has R == G == B (grayscale) 639 // 2. Every pixel has A == 255 (opaque) 640 // 3. There are no more than 256 distinct RGBA colors 641 for (j = 0; j < h; j++) { 642 png_bytep row = imageInfo.rows[j]; 643 png_bytep out = outRows[j]; 644 for (i = 0; i < w; i++) { 645 rr = *row++; 646 gg = *row++; 647 bb = *row++; 648 aa = *row++; 649 if (!trans) { 650 // Ignore the actually byte and assume alpha == 255 651 aa = 0xff; 652 } 653 654 // Check if image is really grayscale 655 if (isGrayscale) { 656 if (rr != gg || rr != bb) { 657 isGrayscale = false; 658 } 659 } 660 661 // Check if image is really opaque 662 if (isOpaque) { 663 if (aa != 0xff) { 664 isOpaque = false; 665 } 666 } 667 668 // Check if image is really <= 256 colors 669 if (isPalette) { 670 col = (uint32_t) ((rr << 24) | (gg << 16) | (bb << 8) | aa); 671 bool match = false; 672 for (idx = 0; idx < num_colors; idx++) { 673 if (colors[idx] == col) { 674 match = true; 675 break; 676 } 677 } 678 679 // Write the palette index for the pixel to outRows optimistically 680 // We might overwrite it later if we decide to encode as gray or 681 // gray + alpha 682 *out++ = idx; 683 if (!match) { 684 if (num_colors == 256) { 685 isPalette = false; 686 } else { 687 colors[num_colors++] = col; 688 } 689 } 690 } 691 } 692 } 693 694 *paletteEntries = 0; 695 *hasTransparency = !isOpaque; 696 int bpp = isOpaque ? 3 : 4; 697 int paletteSize = w * h + bpp * num_colors; 698 699 // Choose the best color type for the image. 700 // 1. Opaque gray - use COLOR_TYPE_GRAY at 1 byte/pixel 701 // 2. Gray + alpha - use COLOR_TYPE_PALETTE if the number of distinct combinations 702 // is sufficiently small, otherwise use COLOR_TYPE_GRAY_ALPHA 703 // 3. RGB(A) - use COLOR_TYPE_PALETTE if the number of distinct colors is sufficiently 704 // small, otherwise use COLOR_TYPE_RGB{_ALPHA} 705 if (isGrayscale) { 706 if (isOpaque) { 707 *colorType = PNG_COLOR_TYPE_GRAY; // 1 byte/pixel 708 } else { 709 // Use a simple heuristic to determine whether using a palette will 710 // save space versus using gray + alpha for each pixel. 711 // This doesn't take into account chunk overhead, filtering, LZ 712 // compression, etc. 713 if (isPalette && (paletteSize < 2 * w * h)) { 714 *colorType = PNG_COLOR_TYPE_PALETTE; // 1 byte/pixel + 4 bytes/color 715 } else { 716 *colorType = PNG_COLOR_TYPE_GRAY_ALPHA; // 2 bytes per pixel 717 } 718 } 719 } else if (isPalette && (paletteSize < bpp * w * h)) { 720 *colorType = PNG_COLOR_TYPE_PALETTE; 721 } else { 722 *colorType = isOpaque ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA; 723 } 724 725 // Perform postprocessing of the image or palette data based on the final 726 // color type chosen 727 728 if (*colorType == PNG_COLOR_TYPE_PALETTE) { 729 // Create separate RGB and Alpha palettes and set the number of colors 730 *paletteEntries = num_colors; 731 732 // Create the RGB and alpha palettes 733 for (int idx = 0; idx < num_colors; idx++) { 734 col = colors[idx]; 735 rgbPalette[idx].red = (png_byte) ((col >> 24) & 0xff); 736 rgbPalette[idx].green = (png_byte) ((col >> 16) & 0xff); 737 rgbPalette[idx].blue = (png_byte) ((col >> 8) & 0xff); 738 alphaPalette[idx] = (png_byte) (col & 0xff); 739 } 740 } else if (*colorType == PNG_COLOR_TYPE_GRAY || *colorType == PNG_COLOR_TYPE_GRAY_ALPHA) { 741 // If the image is gray or gray + alpha, compact the pixels into outRows 742 for (j = 0; j < h; j++) { 743 png_bytep row = imageInfo.rows[j]; 744 png_bytep out = outRows[j]; 745 for (i = 0; i < w; i++) { 746 rr = *row++; 747 gg = *row++; 748 bb = *row++; 749 aa = *row++; 750 751 *out++ = rr; 752 if (!isOpaque) { 753 *out++ = aa; 754 } 755 } 756 } 757 } 758} 759 760 761static void write_png(const char* imageName, 762 png_structp write_ptr, png_infop write_info, 763 image_info& imageInfo) 764{ 765 bool optimize = true; 766 png_uint_32 width, height; 767 int color_type; 768 int bit_depth, interlace_type, compression_type; 769 int i; 770 771 png_unknown_chunk unknowns[1]; 772 773 png_bytepp outRows = (png_bytepp) malloc((int) imageInfo.height * png_sizeof(png_bytep)); 774 if (outRows == (png_bytepp) 0) { 775 printf("Can't allocate output buffer!\n"); 776 exit(1); 777 } 778 for (i = 0; i < (int) imageInfo.height; i++) { 779 outRows[i] = (png_bytep) malloc(2 * (int) imageInfo.width); 780 if (outRows[i] == (png_bytep) 0) { 781 printf("Can't allocate output buffer!\n"); 782 exit(1); 783 } 784 } 785 786 png_set_compression_level(write_ptr, Z_BEST_COMPRESSION); 787 788 NOISY(printf("Writing image %s: w = %d, h = %d, trans = %s\n", imageName, 789 (int) imageInfo.width, (int) imageInfo.height, 790 imageInfo.hasTransparency ? "true" : "false")); 791 792 png_color rgbPalette[256]; 793 png_byte alphaPalette[256]; 794 bool hasTransparency; 795 int paletteEntries; 796 797 if (optimize) { 798 analyze_image(imageInfo, rgbPalette, alphaPalette, &paletteEntries, &hasTransparency, 799 &color_type, outRows); 800 switch (color_type) { 801 case PNG_COLOR_TYPE_PALETTE: 802 NOISY(printf("Image %s has %d colors%s, using PNG_COLOR_TYPE_PALETTE\n", 803 imageName, paletteEntries, 804 hasTransparency ? " (with alpha)" : "")); 805 break; 806 case PNG_COLOR_TYPE_GRAY: 807 NOISY(printf("Image %s is opaque gray, using PNG_COLOR_TYPE_GRAY\n", imageName)); 808 break; 809 case PNG_COLOR_TYPE_GRAY_ALPHA: 810 NOISY(printf("Image %s is gray + alpha, using PNG_COLOR_TYPE_GRAY_ALPHA\n", imageName)); 811 break; 812 case PNG_COLOR_TYPE_RGB: 813 NOISY(printf("Image %s is opaque RGB, using PNG_COLOR_TYPE_RGB\n", imageName)); 814 break; 815 case PNG_COLOR_TYPE_RGB_ALPHA: 816 NOISY(printf("Image %s is RGB + alpha, using PNG_COLOR_TYPE_RGB_ALPHA\n", imageName)); 817 break; 818 } 819 } else { 820 // Force RGB or RGB_ALPHA color type, copy transparency from input 821 paletteEntries = 0; 822 hasTransparency = imageInfo.hasTransparency; 823 color_type = hasTransparency ? PNG_COLOR_TYPE_RGB_ALPHA : PNG_COLOR_TYPE_RGB; 824 } 825 826 png_set_IHDR(write_ptr, write_info, imageInfo.width, imageInfo.height, 827 8, color_type, PNG_INTERLACE_NONE, 828 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); 829 830 if (color_type == PNG_COLOR_TYPE_PALETTE) { 831 png_set_PLTE(write_ptr, write_info, rgbPalette, paletteEntries); 832 if (hasTransparency) { 833 png_set_tRNS(write_ptr, write_info, alphaPalette, paletteEntries, (png_color_16p) 0); 834 } 835 png_set_filter(write_ptr, 0, PNG_NO_FILTERS); 836 } else { 837 png_set_filter(write_ptr, 0, PNG_ALL_FILTERS); 838 } 839 840 if (imageInfo.is9Patch) { 841 NOISY(printf("Adding 9-patch info...\n")); 842 strcpy((char*)unknowns[0].name, "npTc"); 843 unknowns[0].data = (png_byte*)imageInfo.info9Patch.serialize(); 844 unknowns[0].size = imageInfo.info9Patch.serializedSize(); 845 // TODO: remove the check below when everything works 846 checkNinePatchSerialization(&imageInfo.info9Patch, unknowns[0].data); 847 png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS, 848 (png_byte*)"npTc", 1); 849 png_set_unknown_chunks(write_ptr, write_info, unknowns, 1); 850 // XXX I can't get this to work without forcibly changing 851 // the location to what I want... which apparently is supposed 852 // to be a private API, but everything else I have tried results 853 // in the location being set to what I -last- wrote so I never 854 // get written. :p 855 png_set_unknown_chunk_location(write_ptr, write_info, 0, PNG_HAVE_PLTE); 856 } 857 858 png_write_info(write_ptr, write_info); 859 860 if (!imageInfo.hasTransparency) { 861 png_set_filler(write_ptr, 0, PNG_FILLER_AFTER); 862 } 863 864 if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) { 865 png_write_image(write_ptr, imageInfo.rows); 866 } else { 867 png_write_image(write_ptr, outRows); 868 } 869 870 png_write_end(write_ptr, write_info); 871 872 for (i = 0; i < (int) imageInfo.height; i++) { 873 free(outRows[i]); 874 } 875 free(outRows); 876 877 png_get_IHDR(write_ptr, write_info, &width, &height, 878 &bit_depth, &color_type, &interlace_type, 879 &compression_type, NULL); 880 881 NOISY(printf("Image written: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n", 882 (int)width, (int)height, bit_depth, color_type, interlace_type, 883 compression_type)); 884} 885 886status_t preProcessImage(Bundle* bundle, const sp<AaptAssets>& assets, 887 const sp<AaptFile>& file, String8* outNewLeafName) 888{ 889 String8 ext(file->getPath().getPathExtension()); 890 891 // We currently only process PNG images. 892 if (strcmp(ext.string(), ".png") != 0) { 893 return NO_ERROR; 894 } 895 896 // Example of renaming a file: 897 //*outNewLeafName = file->getPath().getBasePath().getFileName(); 898 //outNewLeafName->append(".nupng"); 899 900 String8 printableName(file->getPrintableSource()); 901 902 png_structp read_ptr = NULL; 903 png_infop read_info = NULL; 904 FILE* fp; 905 906 image_info imageInfo; 907 908 png_structp write_ptr = NULL; 909 png_infop write_info = NULL; 910 911 status_t error = UNKNOWN_ERROR; 912 913 const size_t nameLen = file->getPath().length(); 914 915 fp = fopen(file->getSourceFile().string(), "rb"); 916 if (fp == NULL) { 917 fprintf(stderr, "%s: ERROR: Unable to open PNG file\n", printableName.string()); 918 goto bail; 919 } 920 921 read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, (png_error_ptr)NULL, 922 (png_error_ptr)NULL); 923 if (!read_ptr) { 924 goto bail; 925 } 926 927 read_info = png_create_info_struct(read_ptr); 928 if (!read_info) { 929 goto bail; 930 } 931 932 if (setjmp(png_jmpbuf(read_ptr))) { 933 goto bail; 934 } 935 936 png_init_io(read_ptr, fp); 937 938 read_png(printableName.string(), read_ptr, read_info, &imageInfo); 939 940 examine_image(&imageInfo); 941 942 if (nameLen > 6) { 943 const char* name = file->getPath().string(); 944 if (name[nameLen-5] == '9' && name[nameLen-6] == '.') { 945 if (do_9patch(printableName.string(), &imageInfo) != NO_ERROR) { 946 goto bail; 947 } 948 } 949 } 950 951 write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, (png_error_ptr)NULL, 952 (png_error_ptr)NULL); 953 if (!write_ptr) 954 { 955 goto bail; 956 } 957 958 write_info = png_create_info_struct(write_ptr); 959 if (!write_info) 960 { 961 goto bail; 962 } 963 964 png_set_write_fn(write_ptr, (void*)file.get(), 965 png_write_aapt_file, png_flush_aapt_file); 966 967 if (setjmp(png_jmpbuf(write_ptr))) 968 { 969 goto bail; 970 } 971 972 write_png(printableName.string(), write_ptr, write_info, imageInfo); 973 974 error = NO_ERROR; 975 976 if (bundle->getVerbose()) { 977 fseek(fp, 0, SEEK_END); 978 size_t oldSize = (size_t)ftell(fp); 979 size_t newSize = file->getSize(); 980 float factor = ((float)newSize)/oldSize; 981 int percent = (int)(factor*100); 982 printf(" (processed image %s: %d%% size of source)\n", printableName.string(), percent); 983 } 984 985bail: 986 if (read_ptr) { 987 png_destroy_read_struct(&read_ptr, &read_info, (png_infopp)NULL); 988 } 989 if (fp) { 990 fclose(fp); 991 } 992 if (write_ptr) { 993 png_destroy_write_struct(&write_ptr, &write_info); 994 } 995 996 if (error != NO_ERROR) { 997 fprintf(stderr, "ERROR: Failure processing PNG image %s\n", 998 file->getPrintableSource().string()); 999 } 1000 return error; 1001} 1002 1003 1004 1005status_t postProcessImage(const sp<AaptAssets>& assets, 1006 ResourceTable* table, const sp<AaptFile>& file) 1007{ 1008 String8 ext(file->getPath().getPathExtension()); 1009 1010 // At this point, now that we have all the resource data, all we need to 1011 // do is compile XML files. 1012 if (strcmp(ext.string(), ".xml") == 0) { 1013 return compileXmlFile(assets, file, table); 1014 } 1015 1016 return NO_ERROR; 1017} 1018