Images.cpp

   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 <androidfw/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     // Layout padding, if relevant
  61     bool haveLayoutBounds;
  62     int32_t layoutBoundsLeft;
  63     int32_t layoutBoundsTop;
  64     int32_t layoutBoundsRight;
  65     int32_t layoutBoundsBottom;
  66
  67     png_uint_32 allocHeight;
  68     png_bytepp allocRows;
  69 };
  70
  71 static void read_png(const char* imageName,
  72                      png_structp read_ptr, png_infop read_info,
  73                      image_info* outImageInfo)
  74 {
  75     int color_type;
  76     int bit_depth, interlace_type, compression_type;
  77     int i;
  78
  79     png_read_info(read_ptr, read_info);
  80
  81     png_get_IHDR(read_ptr, read_info, &outImageInfo->width,
  82        &outImageInfo->height, &bit_depth, &color_type,
  83        &interlace_type, &compression_type, NULL);
  84
  85     //printf("Image %s:\n", imageName);
  86     //printf("color_type=%d, bit_depth=%d, interlace_type=%d, compression_type=%d\n",
  87     //       color_type, bit_depth, interlace_type, compression_type);
  88
  89     if (color_type == PNG_COLOR_TYPE_PALETTE)
  90         png_set_palette_to_rgb(read_ptr);
  91
  92     if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
  93         png_set_gray_1_2_4_to_8(read_ptr);
  94
  95     if (png_get_valid(read_ptr, read_info, PNG_INFO_tRNS)) {
  96         //printf("Has PNG_INFO_tRNS!\n");
  97         png_set_tRNS_to_alpha(read_ptr);
  98     }
  99
 100     if (bit_depth == 16)
 101         png_set_strip_16(read_ptr);
 102
 103     if ((color_type&PNG_COLOR_MASK_ALPHA) == 0)
 104         png_set_add_alpha(read_ptr, 0xFF, PNG_FILLER_AFTER);
 105
 106     if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
 107         png_set_gray_to_rgb(read_ptr);
 108
 109     png_read_update_info(read_ptr, read_info);
 110
 111     outImageInfo->rows = (png_bytepp)malloc(
 112         outImageInfo->height * png_sizeof(png_bytep));
 113     outImageInfo->allocHeight = outImageInfo->height;
 114     outImageInfo->allocRows = outImageInfo->rows;
 115
 116     png_set_rows(read_ptr, read_info, outImageInfo->rows);
 117
 118     for (i = 0; i < (int)outImageInfo->height; i++)
 119     {
 120         outImageInfo->rows[i] = (png_bytep)
 121             malloc(png_get_rowbytes(read_ptr, read_info));
 122     }
 123
 124     png_read_image(read_ptr, outImageInfo->rows);
 125
 126     png_read_end(read_ptr, read_info);
 127
 128     NOISY(printf("Image %s: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n",
 129                  imageName,
 130                  (int)outImageInfo->width, (int)outImageInfo->height,
 131                  bit_depth, color_type,
 132                  interlace_type, compression_type));
 133
 134     png_get_IHDR(read_ptr, read_info, &outImageInfo->width,
 135        &outImageInfo->height, &bit_depth, &color_type,
 136        &interlace_type, &compression_type, NULL);
 137 }
 138
 139 #define COLOR_TRANSPARENT 0
 140 #define COLOR_WHITE 0xFFFFFFFF
 141 #define COLOR_TICK  0xFF000000
 142 #define COLOR_LAYOUT_BOUNDS_TICK 0xFF0000FF
 143
 144 enum {
 145     TICK_TYPE_NONE,
 146     TICK_TYPE_TICK,
 147     TICK_TYPE_LAYOUT_BOUNDS,
 148     TICK_TYPE_BOTH
 149 };
 150
 151 static int tick_type(png_bytep p, bool transparent, const char** outError)
 152 {
 153     png_uint_32 color = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
 154
 155     if (transparent) {
 156         if (p[3] == 0) {
 157             return TICK_TYPE_NONE;
 158         }
 159         if (color == COLOR_LAYOUT_BOUNDS_TICK) {
 160             return TICK_TYPE_LAYOUT_BOUNDS;
 161         }
 162         if (color == COLOR_TICK) {
 163             return TICK_TYPE_TICK;
 164         }
 165
 166         // Error cases
 167         if (p[3] != 0xff) {
 168             *outError = "Frame pixels must be either solid or transparent (not intermediate alphas)";
 169             return TICK_TYPE_NONE;
 170         }
 171         if (p[0] != 0 || p[1] != 0 || p[2] != 0) {
 172             *outError = "Ticks in transparent frame must be black or red";
 173         }
 174         return TICK_TYPE_TICK;
 175     }
 176
 177     if (p[3] != 0xFF) {
 178         *outError = "White frame must be a solid color (no alpha)";
 179     }
 180     if (color == COLOR_WHITE) {
 181         return TICK_TYPE_NONE;
 182     }
 183     if (color == COLOR_TICK) {
 184         return TICK_TYPE_TICK;
 185     }
 186     if (color == COLOR_LAYOUT_BOUNDS_TICK) {
 187         return TICK_TYPE_LAYOUT_BOUNDS;
 188     }
 189
 190     if (p[0] != 0 || p[1] != 0 || p[2] != 0) {
 191         *outError = "Ticks in white frame must be black or red";
 192         return TICK_TYPE_NONE;
 193     }
 194     return TICK_TYPE_TICK;
 195 }
 196
 197 enum {
 198     TICK_START,
 199     TICK_INSIDE_1,
 200     TICK_OUTSIDE_1
 201 };
 202
 203 static status_t get_horizontal_ticks(
 204         png_bytep row, int width, bool transparent, bool required,
 205         int32_t* outLeft, int32_t* outRight, const char** outError,
 206         uint8_t* outDivs, bool multipleAllowed)
 207 {
 208     int i;
 209     *outLeft = *outRight = -1;
 210     int state = TICK_START;
 211     bool found = false;
 212
 213     for (i=1; i<width-1; i++) {
 214         if (TICK_TYPE_TICK == tick_type(row+i*4, transparent, outError)) {
 215             if (state == TICK_START ||
 216                 (state == TICK_OUTSIDE_1 && multipleAllowed)) {
 217                 *outLeft = i-1;
 218                 *outRight = width-2;
 219                 found = true;
 220                 if (outDivs != NULL) {
 221                     *outDivs += 2;
 222                 }
 223                 state = TICK_INSIDE_1;
 224             } else if (state == TICK_OUTSIDE_1) {
 225                 *outError = "Can't have more than one marked region along edge";
 226                 *outLeft = i;
 227                 return UNKNOWN_ERROR;
 228             }
 229         } else if (*outError == NULL) {
 230             if (state == TICK_INSIDE_1) {
 231                 // We're done with this div.  Move on to the next.
 232                 *outRight = i-1;
 233                 outRight += 2;
 234                 outLeft += 2;
 235                 state = TICK_OUTSIDE_1;
 236             }
 237         } else {
 238             *outLeft = i;
 239             return UNKNOWN_ERROR;
 240         }
 241     }
 242
 243     if (required && !found) {
 244         *outError = "No marked region found along edge";
 245         *outLeft = -1;
 246         return UNKNOWN_ERROR;
 247     }
 248
 249     return NO_ERROR;
 250 }
 251
 252 static status_t get_vertical_ticks(
 253         png_bytepp rows, int offset, int height, bool transparent, bool required,
 254         int32_t* outTop, int32_t* outBottom, const char** outError,
 255         uint8_t* outDivs, bool multipleAllowed)
 256 {
 257     int i;
 258     *outTop = *outBottom = -1;
 259     int state = TICK_START;
 260     bool found = false;
 261
 262     for (i=1; i<height-1; i++) {
 263         if (TICK_TYPE_TICK == tick_type(rows[i]+offset, transparent, outError)) {
 264             if (state == TICK_START ||
 265                 (state == TICK_OUTSIDE_1 && multipleAllowed)) {
 266                 *outTop = i-1;
 267                 *outBottom = height-2;
 268                 found = true;
 269                 if (outDivs != NULL) {
 270                     *outDivs += 2;
 271                 }
 272                 state = TICK_INSIDE_1;
 273             } else if (state == TICK_OUTSIDE_1) {
 274                 *outError = "Can't have more than one marked region along edge";
 275                 *outTop = i;
 276                 return UNKNOWN_ERROR;
 277             }
 278         } else if (*outError == NULL) {
 279             if (state == TICK_INSIDE_1) {
 280                 // We're done with this div.  Move on to the next.
 281                 *outBottom = i-1;
 282                 outTop += 2;
 283                 outBottom += 2;
 284                 state = TICK_OUTSIDE_1;
 285             }
 286         } else {
 287             *outTop = i;
 288             return UNKNOWN_ERROR;
 289         }
 290     }
 291
 292     if (required && !found) {
 293         *outError = "No marked region found along edge";
 294         *outTop = -1;
 295         return UNKNOWN_ERROR;
 296     }
 297
 298     return NO_ERROR;
 299 }
 300
 301 static status_t get_horizontal_layout_bounds_ticks(
 302         png_bytep row, int width, bool transparent, bool required,
 303         int32_t* outLeft, int32_t* outRight, const char** outError)
 304 {
 305     int i;
 306     *outLeft = *outRight = 0;
 307
 308     // Look for left tick
 309     if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(row + 4, transparent, outError)) {
 310         // Starting with a layout padding tick
 311         i = 1;
 312         while (i < width - 1) {
 313             (*outLeft)++;
 314             i++;
 315             int tick = tick_type(row + i * 4, transparent, outError);
 316             if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
 317                 break;
 318             }
 319         }
 320     }
 321
 322     // Look for right tick
 323     if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(row + (width - 2) * 4, transparent, outError)) {
 324         // Ending with a layout padding tick
 325         i = width - 2;
 326         while (i > 1) {
 327             (*outRight)++;
 328             i--;
 329             int tick = tick_type(row+i*4, transparent, outError);
 330             if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
 331                 break;
 332             }
 333         }
 334     }
 335
 336     return NO_ERROR;
 337 }
 338
 339 static status_t get_vertical_layout_bounds_ticks(
 340         png_bytepp rows, int offset, int height, bool transparent, bool required,
 341         int32_t* outTop, int32_t* outBottom, const char** outError)
 342 {
 343     int i;
 344     *outTop = *outBottom = 0;
 345
 346     // Look for top tick
 347     if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(rows[1] + offset, transparent, outError)) {
 348         // Starting with a layout padding tick
 349         i = 1;
 350         while (i < height - 1) {
 351             (*outTop)++;
 352             i++;
 353             int tick = tick_type(rows[i] + offset, transparent, outError);
 354             if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
 355                 break;
 356             }
 357         }
 358     }
 359
 360     // Look for bottom tick
 361     if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(rows[height - 2] + offset, transparent, outError)) {
 362         // Ending with a layout padding tick
 363         i = height - 2;
 364         while (i > 1) {
 365             (*outBottom)++;
 366             i--;
 367             int tick = tick_type(rows[i] + offset, transparent, outError);
 368             if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
 369                 break;
 370             }
 371         }
 372     }
 373
 374     return NO_ERROR;
 375 }
 376
 377
 378 static uint32_t get_color(
 379     png_bytepp rows, int left, int top, int right, int bottom)
 380 {
 381     png_bytep color = rows[top] + left*4;
 382
 383     if (left > right || top > bottom) {
 384         return Res_png_9patch::TRANSPARENT_COLOR;
 385     }
 386
 387     while (top <= bottom) {
 388         for (int i = left; i <= right; i++) {
 389             png_bytep p = rows[top]+i*4;
 390             if (color[3] == 0) {
 391                 if (p[3] != 0) {
 392                     return Res_png_9patch::NO_COLOR;
 393                 }
 394             } else if (p[0] != color[0] || p[1] != color[1]
 395                        || p[2] != color[2] || p[3] != color[3]) {
 396                 return Res_png_9patch::NO_COLOR;
 397             }
 398         }
 399         top++;
 400     }
 401
 402     if (color[3] == 0) {
 403         return Res_png_9patch::TRANSPARENT_COLOR;
 404     }
 405     return (color[3]<<24) | (color[0]<<16) | (color[1]<<8) | color[2];
 406 }
 407
 408 static void select_patch(
 409     int which, int front, int back, int size, int* start, int* end)
 410 {
 411     switch (which) {
 412     case 0:
 413         *start = 0;
 414         *end = front-1;
 415         break;
 416     case 1:
 417         *start = front;
 418         *end = back-1;
 419         break;
 420     case 2:
 421         *start = back;
 422         *end = size-1;
 423         break;
 424     }
 425 }
 426
 427 static uint32_t get_color(image_info* image, int hpatch, int vpatch)
 428 {
 429     int left, right, top, bottom;
 430     select_patch(
 431         hpatch, image->info9Patch.xDivs[0], image->info9Patch.xDivs[1],
 432         image->width, &left, &right);
 433     select_patch(
 434         vpatch, image->info9Patch.yDivs[0], image->info9Patch.yDivs[1],
 435         image->height, &top, &bottom);
 436     //printf("Selecting h=%d v=%d: (%d,%d)-(%d,%d)\n",
 437     //       hpatch, vpatch, left, top, right, bottom);
 438     const uint32_t c = get_color(image->rows, left, top, right, bottom);
 439     NOISY(printf("Color in (%d,%d)-(%d,%d): #%08x\n", left, top, right, bottom, c));
 440     return c;
 441 }
 442
 443 static status_t do_9patch(const char* imageName, image_info* image)
 444 {
 445     image->is9Patch = true;
 446
 447     int W = image->width;
 448     int H = image->height;
 449     int i, j;
 450
 451     int maxSizeXDivs = W * sizeof(int32_t);
 452     int maxSizeYDivs = H * sizeof(int32_t);
 453     int32_t* xDivs = (int32_t*) malloc(maxSizeXDivs);
 454     int32_t* yDivs = (int32_t*) malloc(maxSizeYDivs);
 455     uint8_t  numXDivs = 0;
 456     uint8_t  numYDivs = 0;
 457     int8_t numColors;
 458     int numRows;
 459     int numCols;
 460     int top;
 461     int left;
 462     int right;
 463     int bottom;
 464     memset(xDivs, -1, maxSizeXDivs);
 465     memset(yDivs, -1, maxSizeYDivs);
 466     image->info9Patch.paddingLeft = image->info9Patch.paddingRight =
 467         image->info9Patch.paddingTop = image->info9Patch.paddingBottom = -1;
 468
 469     image->layoutBoundsLeft = image->layoutBoundsRight =
 470         image->layoutBoundsTop = image->layoutBoundsBottom = 0;
 471
 472     png_bytep p = image->rows[0];
 473     bool transparent = p[3] == 0;
 474     bool hasColor = false;
 475
 476     const char* errorMsg = NULL;
 477     int errorPixel = -1;
 478     const char* errorEdge = NULL;
 479
 480     int colorIndex = 0;
 481
 482     // Validate size...
 483     if (W < 3 || H < 3) {
 484         errorMsg = "Image must be at least 3x3 (1x1 without frame) pixels";
 485         goto getout;
 486     }
 487
 488     // Validate frame...
 489     if (!transparent &&
 490         (p[0] != 0xFF || p[1] != 0xFF || p[2] != 0xFF || p[3] != 0xFF)) {
 491         errorMsg = "Must have one-pixel frame that is either transparent or white";
 492         goto getout;
 493     }
 494
 495     // Find left and right of sizing areas...
 496     if (get_horizontal_ticks(p, W, transparent, true, &xDivs[0],
 497                              &xDivs[1], &errorMsg, &numXDivs, true) != NO_ERROR) {
 498         errorPixel = xDivs[0];
 499         errorEdge = "top";
 500         goto getout;
 501     }
 502
 503     // Find top and bottom of sizing areas...
 504     if (get_vertical_ticks(image->rows, 0, H, transparent, true, &yDivs[0],
 505                            &yDivs[1], &errorMsg, &numYDivs, true) != NO_ERROR) {
 506         errorPixel = yDivs[0];
 507         errorEdge = "left";
 508         goto getout;
 509     }
 510
 511     // Find left and right of padding area...
 512     if (get_horizontal_ticks(image->rows[H-1], W, transparent, false, &image->info9Patch.paddingLeft,
 513                              &image->info9Patch.paddingRight, &errorMsg, NULL, false) != NO_ERROR) {
 514         errorPixel = image->info9Patch.paddingLeft;
 515         errorEdge = "bottom";
 516         goto getout;
 517     }
 518
 519     // Find top and bottom of padding area...
 520     if (get_vertical_ticks(image->rows, (W-1)*4, H, transparent, false, &image->info9Patch.paddingTop,
 521                            &image->info9Patch.paddingBottom, &errorMsg, NULL, false) != NO_ERROR) {
 522         errorPixel = image->info9Patch.paddingTop;
 523         errorEdge = "right";
 524         goto getout;
 525     }
 526
 527     // Find left and right of layout padding...
 528     get_horizontal_layout_bounds_ticks(image->rows[H-1], W, transparent, false,
 529                                         &image->layoutBoundsLeft,
 530                                         &image->layoutBoundsRight, &errorMsg);
 531
 532     get_vertical_layout_bounds_ticks(image->rows, (W-1)*4, H, transparent, false,
 533                                         &image->layoutBoundsTop,
 534                                         &image->layoutBoundsBottom, &errorMsg);
 535
 536     image->haveLayoutBounds = image->layoutBoundsLeft != 0
 537                                || image->layoutBoundsRight != 0
 538                                || image->layoutBoundsTop != 0
 539                                || image->layoutBoundsBottom != 0;
 540
 541     if (image->haveLayoutBounds) {
 542         NOISY(printf("layoutBounds=%d %d %d %d\n", image->layoutBoundsLeft, image->layoutBoundsTop,
 543                 image->layoutBoundsRight, image->layoutBoundsBottom));
 544     }
 545
 546     // Copy patch data into image
 547     image->info9Patch.numXDivs = numXDivs;
 548     image->info9Patch.numYDivs = numYDivs;
 549     image->info9Patch.xDivs = xDivs;
 550     image->info9Patch.yDivs = yDivs;
 551
 552     // If padding is not yet specified, take values from size.
 553     if (image->info9Patch.paddingLeft < 0) {
 554         image->info9Patch.paddingLeft = xDivs[0];
 555         image->info9Patch.paddingRight = W - 2 - xDivs[1];
 556     } else {
 557         // Adjust value to be correct!
 558         image->info9Patch.paddingRight = W - 2 - image->info9Patch.paddingRight;
 559     }
 560     if (image->info9Patch.paddingTop < 0) {
 561         image->info9Patch.paddingTop = yDivs[0];
 562         image->info9Patch.paddingBottom = H - 2 - yDivs[1];
 563     } else {
 564         // Adjust value to be correct!
 565         image->info9Patch.paddingBottom = H - 2 - image->info9Patch.paddingBottom;
 566     }
 567
 568     NOISY(printf("Size ticks for %s: x0=%d, x1=%d, y0=%d, y1=%d\n", imageName,
 569                  image->info9Patch.xDivs[0], image->info9Patch.xDivs[1],
 570                  image->info9Patch.yDivs[0], image->info9Patch.yDivs[1]));
 571     NOISY(printf("padding ticks for %s: l=%d, r=%d, t=%d, b=%d\n", imageName,
 572                  image->info9Patch.paddingLeft, image->info9Patch.paddingRight,
 573                  image->info9Patch.paddingTop, image->info9Patch.paddingBottom));
 574
 575     // Remove frame from image.
 576     image->rows = (png_bytepp)malloc((H-2) * png_sizeof(png_bytep));
 577     for (i=0; i<(H-2); i++) {
 578         image->rows[i] = image->allocRows[i+1];
 579         memmove(image->rows[i], image->rows[i]+4, (W-2)*4);
 580     }
 581     image->width -= 2;
 582     W = image->width;
 583     image->height -= 2;
 584     H = image->height;
 585
 586     // Figure out the number of rows and columns in the N-patch
 587     numCols = numXDivs + 1;
 588     if (xDivs[0] == 0) {  // Column 1 is strechable
 589         numCols--;
 590     }
 591     if (xDivs[numXDivs - 1] == W) {
 592         numCols--;
 593     }
 594     numRows = numYDivs + 1;
 595     if (yDivs[0] == 0) {  // Row 1 is strechable
 596         numRows--;
 597     }
 598     if (yDivs[numYDivs - 1] == H) {
 599         numRows--;
 600     }
 601
 602     // Make sure the amount of rows and columns will fit in the number of
 603     // colors we can use in the 9-patch format.
 604     if (numRows * numCols > 0x7F) {
 605         errorMsg = "Too many rows and columns in 9-patch perimeter";
 606         goto getout;
 607     }
 608
 609     numColors = numRows * numCols;
 610     image->info9Patch.numColors = numColors;
 611     image->info9Patch.colors = (uint32_t*)malloc(numColors * sizeof(uint32_t));
 612
 613     // Fill in color information for each patch.
 614
 615     uint32_t c;
 616     top = 0;
 617
 618     // The first row always starts with the top being at y=0 and the bottom
 619     // being either yDivs[1] (if yDivs[0]=0) of yDivs[0].  In the former case
 620     // the first row is stretchable along the Y axis, otherwise it is fixed.
 621     // The last row always ends with the bottom being bitmap.height and the top
 622     // being either yDivs[numYDivs-2] (if yDivs[numYDivs-1]=bitmap.height) or
 623     // yDivs[numYDivs-1]. In the former case the last row is stretchable along
 624     // the Y axis, otherwise it is fixed.
 625     //
 626     // The first and last columns are similarly treated with respect to the X
 627     // axis.
 628     //
 629     // The above is to help explain some of the special casing that goes on the
 630     // code below.
 631
 632     // The initial yDiv and whether the first row is considered stretchable or
 633     // not depends on whether yDiv[0] was zero or not.
 634     for (j = (yDivs[0] == 0 ? 1 : 0);
 635           j <= numYDivs && top < H;
 636           j++) {
 637         if (j == numYDivs) {
 638             bottom = H;
 639         } else {
 640             bottom = yDivs[j];
 641         }
 642         left = 0;
 643         // The initial xDiv and whether the first column is considered
 644         // stretchable or not depends on whether xDiv[0] was zero or not.
 645         for (i = xDivs[0] == 0 ? 1 : 0;
 646               i <= numXDivs && left < W;
 647               i++) {
 648             if (i == numXDivs) {
 649                 right = W;
 650             } else {
 651                 right = xDivs[i];
 652             }
 653             c = get_color(image->rows, left, top, right - 1, bottom - 1);
 654             image->info9Patch.colors[colorIndex++] = c;
 655             NOISY(if (c != Res_png_9patch::NO_COLOR) hasColor = true);
 656             left = right;
 657         }
 658         top = bottom;
 659     }
 660
 661     assert(colorIndex == numColors);
 662
 663     for (i=0; i<numColors; i++) {
 664         if (hasColor) {
 665             if (i == 0) printf("Colors in %s:\n ", imageName);
 666             printf(" #%08x", image->info9Patch.colors[i]);
 667             if (i == numColors - 1) printf("\n");
 668         }
 669     }
 670
 671     image->is9Patch = true;
 672     image->info9Patch.deviceToFile();
 673
 674 getout:
 675     if (errorMsg) {
 676         fprintf(stderr,
 677             "ERROR: 9-patch image %s malformed.\n"
 678             "       %s.\n", imageName, errorMsg);
 679         if (errorEdge != NULL) {
 680             if (errorPixel >= 0) {
 681                 fprintf(stderr,
 682                     "       Found at pixel #%d along %s edge.\n", errorPixel, errorEdge);
 683             } else {
 684                 fprintf(stderr,
 685                     "       Found along %s edge.\n", errorEdge);
 686             }
 687         }
 688         return UNKNOWN_ERROR;
 689     }
 690     return NO_ERROR;
 691 }
 692
 693 static void checkNinePatchSerialization(Res_png_9patch* inPatch,  void * data)
 694 {
 695     if (sizeof(void*) != sizeof(int32_t)) {
 696         // can't deserialize on a non-32 bit system
 697         return;
 698     }
 699     size_t patchSize = inPatch->serializedSize();
 700     void * newData = malloc(patchSize);
 701     memcpy(newData, data, patchSize);
 702     Res_png_9patch* outPatch = inPatch->deserialize(newData);
 703     // deserialization is done in place, so outPatch == newData
 704     assert(outPatch == newData);
 705     assert(outPatch->numXDivs == inPatch->numXDivs);
 706     assert(outPatch->numYDivs == inPatch->numYDivs);
 707     assert(outPatch->paddingLeft == inPatch->paddingLeft);
 708     assert(outPatch->paddingRight == inPatch->paddingRight);
 709     assert(outPatch->paddingTop == inPatch->paddingTop);
 710     assert(outPatch->paddingBottom == inPatch->paddingBottom);
 711     for (int i = 0; i < outPatch->numXDivs; i++) {
 712         assert(outPatch->xDivs[i] == inPatch->xDivs[i]);
 713     }
 714     for (int i = 0; i < outPatch->numYDivs; i++) {
 715         assert(outPatch->yDivs[i] == inPatch->yDivs[i]);
 716     }
 717     for (int i = 0; i < outPatch->numColors; i++) {
 718         assert(outPatch->colors[i] == inPatch->colors[i]);
 719     }
 720     free(newData);
 721 }
 722
 723 static bool patch_equals(Res_png_9patch& patch1, Res_png_9patch& patch2) {
 724     if (!(patch1.numXDivs == patch2.numXDivs &&
 725           patch1.numYDivs == patch2.numYDivs &&
 726           patch1.numColors == patch2.numColors &&
 727           patch1.paddingLeft == patch2.paddingLeft &&
 728           patch1.paddingRight == patch2.paddingRight &&
 729           patch1.paddingTop == patch2.paddingTop &&
 730           patch1.paddingBottom == patch2.paddingBottom)) {
 731             return false;
 732     }
 733     for (int i = 0; i < patch1.numColors; i++) {
 734         if (patch1.colors[i] != patch2.colors[i]) {
 735             return false;
 736         }
 737     }
 738     for (int i = 0; i < patch1.numXDivs; i++) {
 739         if (patch1.xDivs[i] != patch2.xDivs[i]) {
 740             return false;
 741         }
 742     }
 743     for (int i = 0; i < patch1.numYDivs; i++) {
 744         if (patch1.yDivs[i] != patch2.yDivs[i]) {
 745             return false;
 746         }
 747     }
 748     return true;
 749 }
 750
 751 static void dump_image(int w, int h, png_bytepp rows, int color_type)
 752 {
 753     int i, j, rr, gg, bb, aa;
 754
 755     int bpp;
 756     if (color_type == PNG_COLOR_TYPE_PALETTE || color_type == PNG_COLOR_TYPE_GRAY) {
 757         bpp = 1;
 758     } else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
 759         bpp = 2;
 760     } else if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
 761         // We use a padding byte even when there is no alpha
 762         bpp = 4;
 763     } else {
 764         printf("Unknown color type %d.\n", color_type);
 765     }
 766
 767     for (j = 0; j < h; j++) {
 768         png_bytep row = rows[j];
 769         for (i = 0; i < w; i++) {
 770             rr = row[0];
 771             gg = row[1];
 772             bb = row[2];
 773             aa = row[3];
 774             row += bpp;
 775
 776             if (i == 0) {
 777                 printf("Row %d:", j);
 778             }
 779             switch (bpp) {
 780             case 1:
 781                 printf(" (%d)", rr);
 782                 break;
 783             case 2:
 784                 printf(" (%d %d", rr, gg);
 785                 break;
 786             case 3:
 787                 printf(" (%d %d %d)", rr, gg, bb);
 788                 break;
 789             case 4:
 790                 printf(" (%d %d %d %d)", rr, gg, bb, aa);
 791                 break;
 792             }
 793             if (i == (w - 1)) {
 794                 NOISY(printf("\n"));
 795             }
 796         }
 797     }
 798 }
 799
 800 #define MAX(a,b) ((a)>(b)?(a):(b))
 801 #define ABS(a)   ((a)<0?-(a):(a))
 802
 803 static void analyze_image(const char *imageName, image_info &imageInfo, int grayscaleTolerance,
 804                           png_colorp rgbPalette, png_bytep alphaPalette,
 805                           int *paletteEntries, bool *hasTransparency, int *colorType,
 806                           png_bytepp outRows)
 807 {
 808     int w = imageInfo.width;
 809     int h = imageInfo.height;
 810     int i, j, rr, gg, bb, aa, idx;
 811     uint32_t colors[256], col;
 812     int num_colors = 0;
 813     int maxGrayDeviation = 0;
 814
 815     bool isOpaque = true;
 816     bool isPalette = true;
 817     bool isGrayscale = true;
 818
 819     // Scan the entire image and determine if:
 820     // 1. Every pixel has R == G == B (grayscale)
 821     // 2. Every pixel has A == 255 (opaque)
 822     // 3. There are no more than 256 distinct RGBA colors
 823
 824     // NOISY(printf("Initial image data:\n"));
 825     // dump_image(w, h, imageInfo.rows, PNG_COLOR_TYPE_RGB_ALPHA);
 826
 827     for (j = 0; j < h; j++) {
 828         png_bytep row = imageInfo.rows[j];
 829         png_bytep out = outRows[j];
 830         for (i = 0; i < w; i++) {
 831             rr = *row++;
 832             gg = *row++;
 833             bb = *row++;
 834             aa = *row++;
 835
 836             int odev = maxGrayDeviation;
 837             maxGrayDeviation = MAX(ABS(rr - gg), maxGrayDeviation);
 838             maxGrayDeviation = MAX(ABS(gg - bb), maxGrayDeviation);
 839             maxGrayDeviation = MAX(ABS(bb - rr), maxGrayDeviation);
 840             if (maxGrayDeviation > odev) {
 841                 NOISY(printf("New max dev. = %d at pixel (%d, %d) = (%d %d %d %d)\n",
 842                              maxGrayDeviation, i, j, rr, gg, bb, aa));
 843             }
 844
 845             // Check if image is really grayscale
 846             if (isGrayscale) {
 847                 if (rr != gg || rr != bb) {
 848                      NOISY(printf("Found a non-gray pixel at %d, %d = (%d %d %d %d)\n",
 849                                   i, j, rr, gg, bb, aa));
 850                     isGrayscale = false;
 851                 }
 852             }
 853
 854             // Check if image is really opaque
 855             if (isOpaque) {
 856                 if (aa != 0xff) {
 857                     NOISY(printf("Found a non-opaque pixel at %d, %d = (%d %d %d %d)\n",
 858                                  i, j, rr, gg, bb, aa));
 859                     isOpaque = false;
 860                 }
 861             }
 862
 863             // Check if image is really <= 256 colors
 864             if (isPalette) {
 865                 col = (uint32_t) ((rr << 24) | (gg << 16) | (bb << 8) | aa);
 866                 bool match = false;
 867                 for (idx = 0; idx < num_colors; idx++) {
 868                     if (colors[idx] == col) {
 869                         match = true;
 870                         break;
 871                     }
 872                 }
 873
 874                 // Write the palette index for the pixel to outRows optimistically
 875                 // We might overwrite it later if we decide to encode as gray or
 876                 // gray + alpha
 877                 *out++ = idx;
 878                 if (!match) {
 879                     if (num_colors == 256) {
 880                         NOISY(printf("Found 257th color at %d, %d\n", i, j));
 881                         isPalette = false;
 882                     } else {
 883                         colors[num_colors++] = col;
 884                     }
 885                 }
 886             }
 887         }
 888     }
 889
 890     *paletteEntries = 0;
 891     *hasTransparency = !isOpaque;
 892     int bpp = isOpaque ? 3 : 4;
 893     int paletteSize = w * h + bpp * num_colors;
 894
 895     NOISY(printf("isGrayscale = %s\n", isGrayscale ? "true" : "false"));
 896     NOISY(printf("isOpaque = %s\n", isOpaque ? "true" : "false"));
 897     NOISY(printf("isPalette = %s\n", isPalette ? "true" : "false"));
 898     NOISY(printf("Size w/ palette = %d, gray+alpha = %d, rgb(a) = %d\n",
 899                  paletteSize, 2 * w * h, bpp * w * h));
 900     NOISY(printf("Max gray deviation = %d, tolerance = %d\n", maxGrayDeviation, grayscaleTolerance));
 901
 902     // Choose the best color type for the image.
 903     // 1. Opaque gray - use COLOR_TYPE_GRAY at 1 byte/pixel
 904     // 2. Gray + alpha - use COLOR_TYPE_PALETTE if the number of distinct combinations
 905     //     is sufficiently small, otherwise use COLOR_TYPE_GRAY_ALPHA
 906     // 3. RGB(A) - use COLOR_TYPE_PALETTE if the number of distinct colors is sufficiently
 907     //     small, otherwise use COLOR_TYPE_RGB{_ALPHA}
 908     if (isGrayscale) {
 909         if (isOpaque) {
 910             *colorType = PNG_COLOR_TYPE_GRAY; // 1 byte/pixel
 911         } else {
 912             // Use a simple heuristic to determine whether using a palette will
 913             // save space versus using gray + alpha for each pixel.
 914             // This doesn't take into account chunk overhead, filtering, LZ
 915             // compression, etc.
 916             if (isPalette && (paletteSize < 2 * w * h)) {
 917                 *colorType = PNG_COLOR_TYPE_PALETTE; // 1 byte/pixel + 4 bytes/color
 918             } else {
 919                 *colorType = PNG_COLOR_TYPE_GRAY_ALPHA; // 2 bytes per pixel
 920             }
 921         }
 922     } else if (isPalette && (paletteSize < bpp * w * h)) {
 923         *colorType = PNG_COLOR_TYPE_PALETTE;
 924     } else {
 925         if (maxGrayDeviation <= grayscaleTolerance) {
 926             printf("%s: forcing image to gray (max deviation = %d)\n", imageName, maxGrayDeviation);
 927             *colorType = isOpaque ? PNG_COLOR_TYPE_GRAY : PNG_COLOR_TYPE_GRAY_ALPHA;
 928         } else {
 929             *colorType = isOpaque ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA;
 930         }
 931     }
 932
 933     // Perform postprocessing of the image or palette data based on the final
 934     // color type chosen
 935
 936     if (*colorType == PNG_COLOR_TYPE_PALETTE) {
 937         // Create separate RGB and Alpha palettes and set the number of colors
 938         *paletteEntries = num_colors;
 939
 940         // Create the RGB and alpha palettes
 941         for (int idx = 0; idx < num_colors; idx++) {
 942             col = colors[idx];
 943             rgbPalette[idx].red   = (png_byte) ((col >> 24) & 0xff);
 944             rgbPalette[idx].green = (png_byte) ((col >> 16) & 0xff);
 945             rgbPalette[idx].blue  = (png_byte) ((col >>  8) & 0xff);
 946             alphaPalette[idx]     = (png_byte)  (col        & 0xff);
 947         }
 948     } else if (*colorType == PNG_COLOR_TYPE_GRAY || *colorType == PNG_COLOR_TYPE_GRAY_ALPHA) {
 949         // If the image is gray or gray + alpha, compact the pixels into outRows
 950         for (j = 0; j < h; j++) {
 951             png_bytep row = imageInfo.rows[j];
 952             png_bytep out = outRows[j];
 953             for (i = 0; i < w; i++) {
 954                 rr = *row++;
 955                 gg = *row++;
 956                 bb = *row++;
 957                 aa = *row++;
 958
 959                 if (isGrayscale) {
 960                     *out++ = rr;
 961                 } else {
 962                     *out++ = (png_byte) (rr * 0.2126f + gg * 0.7152f + bb * 0.0722f);
 963                 }
 964                 if (!isOpaque) {
 965                     *out++ = aa;
 966                 }
 967            }
 968         }
 969     }
 970 }
 971
 972
 973 static void write_png(const char* imageName,
 974                       png_structp write_ptr, png_infop write_info,
 975                       image_info& imageInfo, int grayscaleTolerance)
 976 {
 977     bool optimize = true;
 978     png_uint_32 width, height;
 979     int color_type;
 980     int bit_depth, interlace_type, compression_type;
 981     int i;
 982
 983     png_unknown_chunk unknowns[2];
 984     unknowns[0].data = NULL;
 985     unknowns[1].data = NULL;
 986
 987     png_bytepp outRows = (png_bytepp) malloc((int) imageInfo.height * png_sizeof(png_bytep));
 988     if (outRows == (png_bytepp) 0) {
 989         printf("Can't allocate output buffer!\n");
 990         exit(1);
 991     }
 992     for (i = 0; i < (int) imageInfo.height; i++) {
 993         outRows[i] = (png_bytep) malloc(2 * (int) imageInfo.width);
 994         if (outRows[i] == (png_bytep) 0) {
 995             printf("Can't allocate output buffer!\n");
 996             exit(1);
 997         }
 998     }
 999
1000     png_set_compression_level(write_ptr, Z_BEST_COMPRESSION);
1001
1002     NOISY(printf("Writing image %s: w = %d, h = %d\n", imageName,
1003           (int) imageInfo.width, (int) imageInfo.height));
1004
1005     png_color rgbPalette[256];
1006     png_byte alphaPalette[256];
1007     bool hasTransparency;
1008     int paletteEntries;
1009
1010     analyze_image(imageName, imageInfo, grayscaleTolerance, rgbPalette, alphaPalette,
1011                   &paletteEntries, &hasTransparency, &color_type, outRows);
1012
1013     // If the image is a 9-patch, we need to preserve it as a ARGB file to make
1014     // sure the pixels will not be pre-dithered/clamped until we decide they are
1015     if (imageInfo.is9Patch && (color_type == PNG_COLOR_TYPE_RGB ||
1016             color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_PALETTE)) {
1017         color_type = PNG_COLOR_TYPE_RGB_ALPHA;
1018     }
1019
1020     switch (color_type) {
1021     case PNG_COLOR_TYPE_PALETTE:
1022         NOISY(printf("Image %s has %d colors%s, using PNG_COLOR_TYPE_PALETTE\n",
1023                      imageName, paletteEntries,
1024                      hasTransparency ? " (with alpha)" : ""));
1025         break;
1026     case PNG_COLOR_TYPE_GRAY:
1027         NOISY(printf("Image %s is opaque gray, using PNG_COLOR_TYPE_GRAY\n", imageName));
1028         break;
1029     case PNG_COLOR_TYPE_GRAY_ALPHA:
1030         NOISY(printf("Image %s is gray + alpha, using PNG_COLOR_TYPE_GRAY_ALPHA\n", imageName));
1031         break;
1032     case PNG_COLOR_TYPE_RGB:
1033         NOISY(printf("Image %s is opaque RGB, using PNG_COLOR_TYPE_RGB\n", imageName));
1034         break;
1035     case PNG_COLOR_TYPE_RGB_ALPHA:
1036         NOISY(printf("Image %s is RGB + alpha, using PNG_COLOR_TYPE_RGB_ALPHA\n", imageName));
1037         break;
1038     }
1039
1040     png_set_IHDR(write_ptr, write_info, imageInfo.width, imageInfo.height,
1041                  8, color_type, PNG_INTERLACE_NONE,
1042                  PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1043
1044     if (color_type == PNG_COLOR_TYPE_PALETTE) {
1045         png_set_PLTE(write_ptr, write_info, rgbPalette, paletteEntries);
1046         if (hasTransparency) {
1047             png_set_tRNS(write_ptr, write_info, alphaPalette, paletteEntries, (png_color_16p) 0);
1048         }
1049        png_set_filter(write_ptr, 0, PNG_NO_FILTERS);
1050     } else {
1051        png_set_filter(write_ptr, 0, PNG_ALL_FILTERS);
1052     }
1053
1054     if (imageInfo.is9Patch) {
1055         int chunk_count = 1 + (imageInfo.haveLayoutBounds ? 1 : 0);
1056         int p_index = imageInfo.haveLayoutBounds ? 1 : 0;
1057         int b_index = 0;
1058         png_byte *chunk_names = imageInfo.haveLayoutBounds
1059                 ? (png_byte*)"npLb\0npTc\0"
1060                 : (png_byte*)"npTc";
1061         NOISY(printf("Adding 9-patch info...\n"));
1062         strcpy((char*)unknowns[p_index].name, "npTc");
1063         unknowns[p_index].data = (png_byte*)imageInfo.info9Patch.serialize();
1064         unknowns[p_index].size = imageInfo.info9Patch.serializedSize();
1065         // TODO: remove the check below when everything works
1066         checkNinePatchSerialization(&imageInfo.info9Patch, unknowns[p_index].data);
1067
1068         if (imageInfo.haveLayoutBounds) {
1069             int chunk_size = sizeof(png_uint_32) * 4;
1070             strcpy((char*)unknowns[b_index].name, "npLb");
1071             unknowns[b_index].data = (png_byte*) calloc(chunk_size, 1);
1072             memcpy(unknowns[b_index].data, &imageInfo.layoutBoundsLeft, chunk_size);
1073             unknowns[b_index].size = chunk_size;
1074         }
1075
1076         png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS,
1077                                     chunk_names, chunk_count);
1078         png_set_unknown_chunks(write_ptr, write_info, unknowns, chunk_count);
1079         // XXX I can't get this to work without forcibly changing
1080         // the location to what I want...  which apparently is supposed
1081         // to be a private API, but everything else I have tried results
1082         // in the location being set to what I -last- wrote so I never
1083         // get written. :p
1084         png_set_unknown_chunk_location(write_ptr, write_info, 0, PNG_HAVE_PLTE);
1085         if (imageInfo.haveLayoutBounds) {
1086             png_set_unknown_chunk_location(write_ptr, write_info, 1, PNG_HAVE_PLTE);
1087         }
1088     }
1089
1090
1091     png_write_info(write_ptr, write_info);
1092
1093     png_bytepp rows;
1094     if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
1095         png_set_filler(write_ptr, 0, PNG_FILLER_AFTER);
1096         rows = imageInfo.rows;
1097     } else {
1098         rows = outRows;
1099     }
1100     png_write_image(write_ptr, rows);
1101
1102 //     NOISY(printf("Final image data:\n"));
1103 //     dump_image(imageInfo.width, imageInfo.height, rows, color_type);
1104
1105     png_write_end(write_ptr, write_info);
1106
1107     for (i = 0; i < (int) imageInfo.height; i++) {
1108         free(outRows[i]);
1109     }
1110     free(outRows);
1111     free(unknowns[0].data);
1112     free(unknowns[1].data);
1113
1114     png_get_IHDR(write_ptr, write_info, &width, &height,
1115        &bit_depth, &color_type, &interlace_type,
1116        &compression_type, NULL);
1117
1118     NOISY(printf("Image written: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n",
1119                  (int)width, (int)height, bit_depth, color_type, interlace_type,
1120                  compression_type));
1121 }
1122
1123 status_t preProcessImage(const Bundle* bundle, const sp<AaptAssets>& assets,
1124                          const sp<AaptFile>& file, String8* outNewLeafName)
1125 {
1126     String8 ext(file->getPath().getPathExtension());
1127
1128     // We currently only process PNG images.
1129     if (strcmp(ext.string(), ".png") != 0) {
1130         return NO_ERROR;
1131     }
1132
1133     // Example of renaming a file:
1134     //*outNewLeafName = file->getPath().getBasePath().getFileName();
1135     //outNewLeafName->append(".nupng");
1136
1137     String8 printableName(file->getPrintableSource());
1138
1139     if (bundle->getVerbose()) {
1140         printf("Processing image: %s\n", printableName.string());
1141     }
1142
1143     png_structp read_ptr = NULL;
1144     png_infop read_info = NULL;
1145     FILE* fp;
1146
1147     image_info imageInfo;
1148
1149     png_structp write_ptr = NULL;
1150     png_infop write_info = NULL;
1151
1152     status_t error = UNKNOWN_ERROR;
1153
1154     const size_t nameLen = file->getPath().length();
1155
1156     fp = fopen(file->getSourceFile().string(), "rb");
1157     if (fp == NULL) {
1158         fprintf(stderr, "%s: ERROR: Unable to open PNG file\n", printableName.string());
1159         goto bail;
1160     }
1161
1162     read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, (png_error_ptr)NULL,
1163                                         (png_error_ptr)NULL);
1164     if (!read_ptr) {
1165         goto bail;
1166     }
1167
1168     read_info = png_create_info_struct(read_ptr);
1169     if (!read_info) {
1170         goto bail;
1171     }
1172
1173     if (setjmp(png_jmpbuf(read_ptr))) {
1174         goto bail;
1175     }
1176
1177     png_init_io(read_ptr, fp);
1178
1179     read_png(printableName.string(), read_ptr, read_info, &imageInfo);
1180
1181     if (nameLen > 6) {
1182         const char* name = file->getPath().string();
1183         if (name[nameLen-5] == '9' && name[nameLen-6] == '.') {
1184             if (do_9patch(printableName.string(), &imageInfo) != NO_ERROR) {
1185                 goto bail;
1186             }
1187         }
1188     }
1189
1190     write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, (png_error_ptr)NULL,
1191                                         (png_error_ptr)NULL);
1192     if (!write_ptr)
1193     {
1194         goto bail;
1195     }
1196
1197     write_info = png_create_info_struct(write_ptr);
1198     if (!write_info)
1199     {
1200         goto bail;
1201     }
1202
1203     png_set_write_fn(write_ptr, (void*)file.get(),
1204                      png_write_aapt_file, png_flush_aapt_file);
1205
1206     if (setjmp(png_jmpbuf(write_ptr)))
1207     {
1208         goto bail;
1209     }
1210
1211     write_png(printableName.string(), write_ptr, write_info, imageInfo,
1212               bundle->getGrayscaleTolerance());
1213
1214     error = NO_ERROR;
1215
1216     if (bundle->getVerbose()) {
1217         fseek(fp, 0, SEEK_END);
1218         size_t oldSize = (size_t)ftell(fp);
1219         size_t newSize = file->getSize();
1220         float factor = ((float)newSize)/oldSize;
1221         int percent = (int)(factor*100);
1222         printf("    (processed image %s: %d%% size of source)\n", printableName.string(), percent);
1223     }
1224
1225 bail:
1226     if (read_ptr) {
1227         png_destroy_read_struct(&read_ptr, &read_info, (png_infopp)NULL);
1228     }
1229     if (fp) {
1230         fclose(fp);
1231     }
1232     if (write_ptr) {
1233         png_destroy_write_struct(&write_ptr, &write_info);
1234     }
1235
1236     if (error != NO_ERROR) {
1237         fprintf(stderr, "ERROR: Failure processing PNG image %s\n",
1238                 file->getPrintableSource().string());
1239     }
1240     return error;
1241 }
1242
1243 status_t preProcessImageToCache(const Bundle* bundle, const String8& source, const String8& dest)
1244 {
1245     png_structp read_ptr = NULL;
1246     png_infop read_info = NULL;
1247
1248     FILE* fp;
1249
1250     image_info imageInfo;
1251
1252     png_structp write_ptr = NULL;
1253     png_infop write_info = NULL;
1254
1255     status_t error = UNKNOWN_ERROR;
1256
1257     if (bundle->getVerbose()) {
1258         printf("Processing image to cache: %s => %s\n", source.string(), dest.string());
1259     }
1260
1261     // Get a file handler to read from
1262     fp = fopen(source.string(),"rb");
1263     if (fp == NULL) {
1264         fprintf(stderr, "%s ERROR: Unable to open PNG file\n", source.string());
1265         return error;
1266     }
1267
1268     // Call libpng to get a struct to read image data into
1269     read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
1270     if (!read_ptr) {
1271         fclose(fp);
1272         png_destroy_read_struct(&read_ptr, &read_info,NULL);
1273         return error;
1274     }
1275
1276     // Call libpng to get a struct to read image info into
1277     read_info = png_create_info_struct(read_ptr);
1278     if (!read_info) {
1279         fclose(fp);
1280         png_destroy_read_struct(&read_ptr, &read_info,NULL);
1281         return error;
1282     }
1283
1284     // Set a jump point for libpng to long jump back to on error
1285     if (setjmp(png_jmpbuf(read_ptr))) {
1286         fclose(fp);
1287         png_destroy_read_struct(&read_ptr, &read_info,NULL);
1288         return error;
1289     }
1290
1291     // Set up libpng to read from our file.
1292     png_init_io(read_ptr,fp);
1293
1294     // Actually read data from the file
1295     read_png(source.string(), read_ptr, read_info, &imageInfo);
1296
1297     // We're done reading so we can clean up
1298     // Find old file size before releasing handle
1299     fseek(fp, 0, SEEK_END);
1300     size_t oldSize = (size_t)ftell(fp);
1301     fclose(fp);
1302     png_destroy_read_struct(&read_ptr, &read_info,NULL);
1303
1304     // Check to see if we're dealing with a 9-patch
1305     // If we are, process appropriately
1306     if (source.getBasePath().getPathExtension() == ".9")  {
1307         if (do_9patch(source.string(), &imageInfo) != NO_ERROR) {
1308             return error;
1309         }
1310     }
1311
1312     // Call libpng to create a structure to hold the processed image data
1313     // that can be written to disk
1314     write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
1315     if (!write_ptr) {
1316         png_destroy_write_struct(&write_ptr, &write_info);
1317         return error;
1318     }
1319
1320     // Call libpng to create a structure to hold processed image info that can
1321     // be written to disk
1322     write_info = png_create_info_struct(write_ptr);
1323     if (!write_info) {
1324         png_destroy_write_struct(&write_ptr, &write_info);
1325         return error;
1326     }
1327
1328     // Open up our destination file for writing
1329     fp = fopen(dest.string(), "wb");
1330     if (!fp) {
1331         fprintf(stderr, "%s ERROR: Unable to open PNG file\n", dest.string());
1332         png_destroy_write_struct(&write_ptr, &write_info);
1333         return error;
1334     }
1335
1336     // Set up libpng to write to our file
1337     png_init_io(write_ptr, fp);
1338
1339     // Set up a jump for libpng to long jump back on on errors
1340     if (setjmp(png_jmpbuf(write_ptr))) {
1341         fclose(fp);
1342         png_destroy_write_struct(&write_ptr, &write_info);
1343         return error;
1344     }
1345
1346     // Actually write out to the new png
1347     write_png(dest.string(), write_ptr, write_info, imageInfo,
1348               bundle->getGrayscaleTolerance());
1349
1350     if (bundle->getVerbose()) {
1351         // Find the size of our new file
1352         FILE* reader = fopen(dest.string(), "rb");
1353         fseek(reader, 0, SEEK_END);
1354         size_t newSize = (size_t)ftell(reader);
1355         fclose(reader);
1356
1357         float factor = ((float)newSize)/oldSize;
1358         int percent = (int)(factor*100);
1359         printf("  (processed image to cache entry %s: %d%% size of source)\n",
1360                dest.string(), percent);
1361     }
1362
1363     //Clean up
1364     fclose(fp);
1365     png_destroy_write_struct(&write_ptr, &write_info);
1366
1367     return NO_ERROR;
1368 }
1369
1370 status_t postProcessImage(const sp<AaptAssets>& assets,
1371                           ResourceTable* table, const sp<AaptFile>& file)
1372 {
1373     String8 ext(file->getPath().getPathExtension());
1374
1375     // At this point, now that we have all the resource data, all we need to
1376     // do is compile XML files.
1377     if (strcmp(ext.string(), ".xml") == 0) {
1378         return compileXmlFile(assets, file, table);
1379     }
1380
1381     return NO_ERROR;
1382 }