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 #include <zlib.h>
16
17 // Change this to true for noisy debug output.
18 static const bool kIsDebug = false;
19
20 static void
png_write_aapt_file(png_structp png_ptr,png_bytep data,png_size_t length)21 png_write_aapt_file(png_structp png_ptr, png_bytep data, png_size_t length)
22 {
23 AaptFile* aaptfile = (AaptFile*) png_get_io_ptr(png_ptr);
24 status_t err = aaptfile->writeData(data, length);
25 if (err != NO_ERROR) {
26 png_error(png_ptr, "Write Error");
27 }
28 }
29
30
31 static void
png_flush_aapt_file(png_structp)32 png_flush_aapt_file(png_structp /* png_ptr */)
33 {
34 }
35
36 // This holds an image as 8bpp RGBA.
37 struct image_info
38 {
image_infoimage_info39 image_info() : rows(NULL), is9Patch(false),
40 xDivs(NULL), yDivs(NULL), colors(NULL), allocRows(NULL) { }
41
~image_infoimage_info42 ~image_info() {
43 if (rows && rows != allocRows) {
44 free(rows);
45 }
46 if (allocRows) {
47 for (int i=0; i<(int)allocHeight; i++) {
48 free(allocRows[i]);
49 }
50 free(allocRows);
51 }
52 free(xDivs);
53 free(yDivs);
54 free(colors);
55 }
56
serialize9patchimage_info57 void* serialize9patch() {
58 void* serialized = Res_png_9patch::serialize(info9Patch, xDivs, yDivs, colors);
59 reinterpret_cast<Res_png_9patch*>(serialized)->deviceToFile();
60 return serialized;
61 }
62
63 png_uint_32 width;
64 png_uint_32 height;
65 png_bytepp rows;
66
67 // 9-patch info.
68 bool is9Patch;
69 Res_png_9patch info9Patch;
70 int32_t* xDivs;
71 int32_t* yDivs;
72 uint32_t* colors;
73
74 // Layout padding, if relevant
75 bool haveLayoutBounds;
76 int32_t layoutBoundsLeft;
77 int32_t layoutBoundsTop;
78 int32_t layoutBoundsRight;
79 int32_t layoutBoundsBottom;
80
81 // Round rect outline description
82 int32_t outlineInsetsLeft;
83 int32_t outlineInsetsTop;
84 int32_t outlineInsetsRight;
85 int32_t outlineInsetsBottom;
86 float outlineRadius;
87 uint8_t outlineAlpha;
88
89 png_uint_32 allocHeight;
90 png_bytepp allocRows;
91 };
92
log_warning(png_structp png_ptr,png_const_charp warning_message)93 static void log_warning(png_structp png_ptr, png_const_charp warning_message)
94 {
95 const char* imageName = (const char*) png_get_error_ptr(png_ptr);
96 fprintf(stderr, "%s: libpng warning: %s\n", imageName, warning_message);
97 }
98
read_png(const char * imageName,png_structp read_ptr,png_infop read_info,image_info * outImageInfo)99 static void read_png(const char* imageName,
100 png_structp read_ptr, png_infop read_info,
101 image_info* outImageInfo)
102 {
103 int color_type;
104 int bit_depth, interlace_type, compression_type;
105 int i;
106
107 png_set_error_fn(read_ptr, const_cast<char*>(imageName),
108 NULL /* use default errorfn */, log_warning);
109 png_read_info(read_ptr, read_info);
110
111 png_get_IHDR(read_ptr, read_info, &outImageInfo->width,
112 &outImageInfo->height, &bit_depth, &color_type,
113 &interlace_type, &compression_type, NULL);
114
115 //printf("Image %s:\n", imageName);
116 //printf("color_type=%d, bit_depth=%d, interlace_type=%d, compression_type=%d\n",
117 // color_type, bit_depth, interlace_type, compression_type);
118
119 if (color_type == PNG_COLOR_TYPE_PALETTE)
120 png_set_palette_to_rgb(read_ptr);
121
122 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
123 png_set_expand_gray_1_2_4_to_8(read_ptr);
124
125 if (png_get_valid(read_ptr, read_info, PNG_INFO_tRNS)) {
126 //printf("Has PNG_INFO_tRNS!\n");
127 png_set_tRNS_to_alpha(read_ptr);
128 }
129
130 if (bit_depth == 16)
131 png_set_strip_16(read_ptr);
132
133 if ((color_type&PNG_COLOR_MASK_ALPHA) == 0)
134 png_set_add_alpha(read_ptr, 0xFF, PNG_FILLER_AFTER);
135
136 if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
137 png_set_gray_to_rgb(read_ptr);
138
139 png_set_interlace_handling(read_ptr);
140
141 png_read_update_info(read_ptr, read_info);
142
143 outImageInfo->rows = (png_bytepp)malloc(
144 outImageInfo->height * sizeof(png_bytep));
145 outImageInfo->allocHeight = outImageInfo->height;
146 outImageInfo->allocRows = outImageInfo->rows;
147
148 png_set_rows(read_ptr, read_info, outImageInfo->rows);
149
150 for (i = 0; i < (int)outImageInfo->height; i++)
151 {
152 outImageInfo->rows[i] = (png_bytep)
153 malloc(png_get_rowbytes(read_ptr, read_info));
154 }
155
156 png_read_image(read_ptr, outImageInfo->rows);
157
158 png_read_end(read_ptr, read_info);
159
160 if (kIsDebug) {
161 printf("Image %s: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n",
162 imageName,
163 (int)outImageInfo->width, (int)outImageInfo->height,
164 bit_depth, color_type,
165 interlace_type, compression_type);
166 }
167
168 png_get_IHDR(read_ptr, read_info, &outImageInfo->width,
169 &outImageInfo->height, &bit_depth, &color_type,
170 &interlace_type, &compression_type, NULL);
171 }
172
173 #define COLOR_TRANSPARENT 0
174 #define COLOR_WHITE 0xFFFFFFFF
175 #define COLOR_TICK 0xFF000000
176 #define COLOR_LAYOUT_BOUNDS_TICK 0xFF0000FF
177
178 enum {
179 TICK_TYPE_NONE,
180 TICK_TYPE_TICK,
181 TICK_TYPE_LAYOUT_BOUNDS,
182 TICK_TYPE_BOTH
183 };
184
tick_type(png_bytep p,bool transparent,const char ** outError)185 static int tick_type(png_bytep p, bool transparent, const char** outError)
186 {
187 png_uint_32 color = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
188
189 if (transparent) {
190 if (p[3] == 0) {
191 return TICK_TYPE_NONE;
192 }
193 if (color == COLOR_LAYOUT_BOUNDS_TICK) {
194 return TICK_TYPE_LAYOUT_BOUNDS;
195 }
196 if (color == COLOR_TICK) {
197 return TICK_TYPE_TICK;
198 }
199
200 // Error cases
201 if (p[3] != 0xff) {
202 *outError = "Frame pixels must be either solid or transparent (not intermediate alphas)";
203 return TICK_TYPE_NONE;
204 }
205 if (p[0] != 0 || p[1] != 0 || p[2] != 0) {
206 *outError = "Ticks in transparent frame must be black or red";
207 }
208 return TICK_TYPE_TICK;
209 }
210
211 if (p[3] != 0xFF) {
212 *outError = "White frame must be a solid color (no alpha)";
213 }
214 if (color == COLOR_WHITE) {
215 return TICK_TYPE_NONE;
216 }
217 if (color == COLOR_TICK) {
218 return TICK_TYPE_TICK;
219 }
220 if (color == COLOR_LAYOUT_BOUNDS_TICK) {
221 return TICK_TYPE_LAYOUT_BOUNDS;
222 }
223
224 if (p[0] != 0 || p[1] != 0 || p[2] != 0) {
225 *outError = "Ticks in white frame must be black or red";
226 return TICK_TYPE_NONE;
227 }
228 return TICK_TYPE_TICK;
229 }
230
231 enum {
232 TICK_START,
233 TICK_INSIDE_1,
234 TICK_OUTSIDE_1
235 };
236
get_horizontal_ticks(png_bytep row,int width,bool transparent,bool required,int32_t * outLeft,int32_t * outRight,const char ** outError,uint8_t * outDivs,bool multipleAllowed)237 static status_t get_horizontal_ticks(
238 png_bytep row, int width, bool transparent, bool required,
239 int32_t* outLeft, int32_t* outRight, const char** outError,
240 uint8_t* outDivs, bool multipleAllowed)
241 {
242 int i;
243 *outLeft = *outRight = -1;
244 int state = TICK_START;
245 bool found = false;
246
247 for (i=1; i<width-1; i++) {
248 if (TICK_TYPE_TICK == tick_type(row+i*4, transparent, outError)) {
249 if (state == TICK_START ||
250 (state == TICK_OUTSIDE_1 && multipleAllowed)) {
251 *outLeft = i-1;
252 *outRight = width-2;
253 found = true;
254 if (outDivs != NULL) {
255 *outDivs += 2;
256 }
257 state = TICK_INSIDE_1;
258 } else if (state == TICK_OUTSIDE_1) {
259 *outError = "Can't have more than one marked region along edge";
260 *outLeft = i;
261 return UNKNOWN_ERROR;
262 }
263 } else if (*outError == NULL) {
264 if (state == TICK_INSIDE_1) {
265 // We're done with this div. Move on to the next.
266 *outRight = i-1;
267 outRight += 2;
268 outLeft += 2;
269 state = TICK_OUTSIDE_1;
270 }
271 } else {
272 *outLeft = i;
273 return UNKNOWN_ERROR;
274 }
275 }
276
277 if (required && !found) {
278 *outError = "No marked region found along edge";
279 *outLeft = -1;
280 return UNKNOWN_ERROR;
281 }
282
283 return NO_ERROR;
284 }
285
get_vertical_ticks(png_bytepp rows,int offset,int height,bool transparent,bool required,int32_t * outTop,int32_t * outBottom,const char ** outError,uint8_t * outDivs,bool multipleAllowed)286 static status_t get_vertical_ticks(
287 png_bytepp rows, int offset, int height, bool transparent, bool required,
288 int32_t* outTop, int32_t* outBottom, const char** outError,
289 uint8_t* outDivs, bool multipleAllowed)
290 {
291 int i;
292 *outTop = *outBottom = -1;
293 int state = TICK_START;
294 bool found = false;
295
296 for (i=1; i<height-1; i++) {
297 if (TICK_TYPE_TICK == tick_type(rows[i]+offset, transparent, outError)) {
298 if (state == TICK_START ||
299 (state == TICK_OUTSIDE_1 && multipleAllowed)) {
300 *outTop = i-1;
301 *outBottom = height-2;
302 found = true;
303 if (outDivs != NULL) {
304 *outDivs += 2;
305 }
306 state = TICK_INSIDE_1;
307 } else if (state == TICK_OUTSIDE_1) {
308 *outError = "Can't have more than one marked region along edge";
309 *outTop = i;
310 return UNKNOWN_ERROR;
311 }
312 } else if (*outError == NULL) {
313 if (state == TICK_INSIDE_1) {
314 // We're done with this div. Move on to the next.
315 *outBottom = i-1;
316 outTop += 2;
317 outBottom += 2;
318 state = TICK_OUTSIDE_1;
319 }
320 } else {
321 *outTop = i;
322 return UNKNOWN_ERROR;
323 }
324 }
325
326 if (required && !found) {
327 *outError = "No marked region found along edge";
328 *outTop = -1;
329 return UNKNOWN_ERROR;
330 }
331
332 return NO_ERROR;
333 }
334
get_horizontal_layout_bounds_ticks(png_bytep row,int width,bool transparent,bool,int32_t * outLeft,int32_t * outRight,const char ** outError)335 static status_t get_horizontal_layout_bounds_ticks(
336 png_bytep row, int width, bool transparent, bool /* required */,
337 int32_t* outLeft, int32_t* outRight, const char** outError)
338 {
339 int i;
340 *outLeft = *outRight = 0;
341
342 // Look for left tick
343 if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(row + 4, transparent, outError)) {
344 // Starting with a layout padding tick
345 i = 1;
346 while (i < width - 1) {
347 (*outLeft)++;
348 i++;
349 int tick = tick_type(row + i * 4, transparent, outError);
350 if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
351 break;
352 }
353 }
354 }
355
356 // Look for right tick
357 if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(row + (width - 2) * 4, transparent, outError)) {
358 // Ending with a layout padding tick
359 i = width - 2;
360 while (i > 1) {
361 (*outRight)++;
362 i--;
363 int tick = tick_type(row+i*4, transparent, outError);
364 if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
365 break;
366 }
367 }
368 }
369
370 return NO_ERROR;
371 }
372
get_vertical_layout_bounds_ticks(png_bytepp rows,int offset,int height,bool transparent,bool,int32_t * outTop,int32_t * outBottom,const char ** outError)373 static status_t get_vertical_layout_bounds_ticks(
374 png_bytepp rows, int offset, int height, bool transparent, bool /* required */,
375 int32_t* outTop, int32_t* outBottom, const char** outError)
376 {
377 int i;
378 *outTop = *outBottom = 0;
379
380 // Look for top tick
381 if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(rows[1] + offset, transparent, outError)) {
382 // Starting with a layout padding tick
383 i = 1;
384 while (i < height - 1) {
385 (*outTop)++;
386 i++;
387 int tick = tick_type(rows[i] + offset, transparent, outError);
388 if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
389 break;
390 }
391 }
392 }
393
394 // Look for bottom tick
395 if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(rows[height - 2] + offset, transparent, outError)) {
396 // Ending with a layout padding tick
397 i = height - 2;
398 while (i > 1) {
399 (*outBottom)++;
400 i--;
401 int tick = tick_type(rows[i] + offset, transparent, outError);
402 if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
403 break;
404 }
405 }
406 }
407
408 return NO_ERROR;
409 }
410
find_max_opacity(png_byte ** rows,int startX,int startY,int endX,int endY,int dX,int dY,int * out_inset)411 static void find_max_opacity(png_byte** rows,
412 int startX, int startY, int endX, int endY, int dX, int dY,
413 int* out_inset)
414 {
415 uint8_t max_opacity = 0;
416 int inset = 0;
417 *out_inset = 0;
418 for (int x = startX, y = startY; x != endX && y != endY; x += dX, y += dY, inset++) {
419 png_byte* color = rows[y] + x * 4;
420 uint8_t opacity = color[3];
421 if (opacity > max_opacity) {
422 max_opacity = opacity;
423 *out_inset = inset;
424 }
425 if (opacity == 0xff) return;
426 }
427 }
428
max_alpha_over_row(png_byte * row,int startX,int endX)429 static uint8_t max_alpha_over_row(png_byte* row, int startX, int endX)
430 {
431 uint8_t max_alpha = 0;
432 for (int x = startX; x < endX; x++) {
433 uint8_t alpha = (row + x * 4)[3];
434 if (alpha > max_alpha) max_alpha = alpha;
435 }
436 return max_alpha;
437 }
438
max_alpha_over_col(png_byte ** rows,int offsetX,int startY,int endY)439 static uint8_t max_alpha_over_col(png_byte** rows, int offsetX, int startY, int endY)
440 {
441 uint8_t max_alpha = 0;
442 for (int y = startY; y < endY; y++) {
443 uint8_t alpha = (rows[y] + offsetX * 4)[3];
444 if (alpha > max_alpha) max_alpha = alpha;
445 }
446 return max_alpha;
447 }
448
get_outline(image_info * image)449 static void get_outline(image_info* image)
450 {
451 int midX = image->width / 2;
452 int midY = image->height / 2;
453 int endX = image->width - 2;
454 int endY = image->height - 2;
455
456 // find left and right extent of nine patch content on center row
457 if (image->width > 4) {
458 find_max_opacity(image->rows, 1, midY, midX, -1, 1, 0, &image->outlineInsetsLeft);
459 find_max_opacity(image->rows, endX, midY, midX, -1, -1, 0, &image->outlineInsetsRight);
460 } else {
461 image->outlineInsetsLeft = 0;
462 image->outlineInsetsRight = 0;
463 }
464
465 // find top and bottom extent of nine patch content on center column
466 if (image->height > 4) {
467 find_max_opacity(image->rows, midX, 1, -1, midY, 0, 1, &image->outlineInsetsTop);
468 find_max_opacity(image->rows, midX, endY, -1, midY, 0, -1, &image->outlineInsetsBottom);
469 } else {
470 image->outlineInsetsTop = 0;
471 image->outlineInsetsBottom = 0;
472 }
473
474 int innerStartX = 1 + image->outlineInsetsLeft;
475 int innerStartY = 1 + image->outlineInsetsTop;
476 int innerEndX = endX - image->outlineInsetsRight;
477 int innerEndY = endY - image->outlineInsetsBottom;
478 int innerMidX = (innerEndX + innerStartX) / 2;
479 int innerMidY = (innerEndY + innerStartY) / 2;
480
481 // assuming the image is a round rect, compute the radius by marching
482 // diagonally from the top left corner towards the center
483 image->outlineAlpha = std::max(
484 max_alpha_over_row(image->rows[innerMidY], innerStartX, innerEndX),
485 max_alpha_over_col(image->rows, innerMidX, innerStartY, innerStartY));
486
487 int diagonalInset = 0;
488 find_max_opacity(image->rows, innerStartX, innerStartY, innerMidX, innerMidY, 1, 1,
489 &diagonalInset);
490
491 /* Determine source radius based upon inset:
492 * sqrt(r^2 + r^2) = sqrt(i^2 + i^2) + r
493 * sqrt(2) * r = sqrt(2) * i + r
494 * (sqrt(2) - 1) * r = sqrt(2) * i
495 * r = sqrt(2) / (sqrt(2) - 1) * i
496 */
497 image->outlineRadius = 3.4142f * diagonalInset;
498
499 if (kIsDebug) {
500 printf("outline insets %d %d %d %d, rad %f, alpha %x\n",
501 image->outlineInsetsLeft,
502 image->outlineInsetsTop,
503 image->outlineInsetsRight,
504 image->outlineInsetsBottom,
505 image->outlineRadius,
506 image->outlineAlpha);
507 }
508 }
509
510
get_color(png_bytepp rows,int left,int top,int right,int bottom)511 static uint32_t get_color(
512 png_bytepp rows, int left, int top, int right, int bottom)
513 {
514 png_bytep color = rows[top] + left*4;
515
516 if (left > right || top > bottom) {
517 return Res_png_9patch::TRANSPARENT_COLOR;
518 }
519
520 while (top <= bottom) {
521 for (int i = left; i <= right; i++) {
522 png_bytep p = rows[top]+i*4;
523 if (color[3] == 0) {
524 if (p[3] != 0) {
525 return Res_png_9patch::NO_COLOR;
526 }
527 } else if (p[0] != color[0] || p[1] != color[1]
528 || p[2] != color[2] || p[3] != color[3]) {
529 return Res_png_9patch::NO_COLOR;
530 }
531 }
532 top++;
533 }
534
535 if (color[3] == 0) {
536 return Res_png_9patch::TRANSPARENT_COLOR;
537 }
538 return (color[3]<<24) | (color[0]<<16) | (color[1]<<8) | color[2];
539 }
540
do_9patch(const char * imageName,image_info * image)541 static status_t do_9patch(const char* imageName, image_info* image)
542 {
543 image->is9Patch = true;
544
545 int W = image->width;
546 int H = image->height;
547 int i, j;
548
549 int maxSizeXDivs = W * sizeof(int32_t);
550 int maxSizeYDivs = H * sizeof(int32_t);
551 int32_t* xDivs = image->xDivs = (int32_t*) malloc(maxSizeXDivs);
552 int32_t* yDivs = image->yDivs = (int32_t*) malloc(maxSizeYDivs);
553 uint8_t numXDivs = 0;
554 uint8_t numYDivs = 0;
555
556 int8_t numColors;
557 int numRows;
558 int numCols;
559 int top;
560 int left;
561 int right;
562 int bottom;
563 memset(xDivs, -1, maxSizeXDivs);
564 memset(yDivs, -1, maxSizeYDivs);
565 image->info9Patch.paddingLeft = image->info9Patch.paddingRight =
566 image->info9Patch.paddingTop = image->info9Patch.paddingBottom = -1;
567
568 image->layoutBoundsLeft = image->layoutBoundsRight =
569 image->layoutBoundsTop = image->layoutBoundsBottom = 0;
570
571 png_bytep p = image->rows[0];
572 bool transparent = p[3] == 0;
573 bool hasColor = false;
574
575 const char* errorMsg = NULL;
576 int errorPixel = -1;
577 const char* errorEdge = NULL;
578
579 int colorIndex = 0;
580
581 // Validate size...
582 if (W < 3 || H < 3) {
583 errorMsg = "Image must be at least 3x3 (1x1 without frame) pixels";
584 goto getout;
585 }
586
587 // Validate frame...
588 if (!transparent &&
589 (p[0] != 0xFF || p[1] != 0xFF || p[2] != 0xFF || p[3] != 0xFF)) {
590 errorMsg = "Must have one-pixel frame that is either transparent or white";
591 goto getout;
592 }
593
594 // Find left and right of sizing areas...
595 if (get_horizontal_ticks(p, W, transparent, true, &xDivs[0],
596 &xDivs[1], &errorMsg, &numXDivs, true) != NO_ERROR) {
597 errorPixel = xDivs[0];
598 errorEdge = "top";
599 goto getout;
600 }
601
602 // Find top and bottom of sizing areas...
603 if (get_vertical_ticks(image->rows, 0, H, transparent, true, &yDivs[0],
604 &yDivs[1], &errorMsg, &numYDivs, true) != NO_ERROR) {
605 errorPixel = yDivs[0];
606 errorEdge = "left";
607 goto getout;
608 }
609
610 // Copy patch size data into image...
611 image->info9Patch.numXDivs = numXDivs;
612 image->info9Patch.numYDivs = numYDivs;
613
614 // Find left and right of padding area...
615 if (get_horizontal_ticks(image->rows[H-1], W, transparent, false, &image->info9Patch.paddingLeft,
616 &image->info9Patch.paddingRight, &errorMsg, NULL, false) != NO_ERROR) {
617 errorPixel = image->info9Patch.paddingLeft;
618 errorEdge = "bottom";
619 goto getout;
620 }
621
622 // Find top and bottom of padding area...
623 if (get_vertical_ticks(image->rows, (W-1)*4, H, transparent, false, &image->info9Patch.paddingTop,
624 &image->info9Patch.paddingBottom, &errorMsg, NULL, false) != NO_ERROR) {
625 errorPixel = image->info9Patch.paddingTop;
626 errorEdge = "right";
627 goto getout;
628 }
629
630 // Find left and right of layout padding...
631 get_horizontal_layout_bounds_ticks(image->rows[H-1], W, transparent, false,
632 &image->layoutBoundsLeft,
633 &image->layoutBoundsRight, &errorMsg);
634
635 get_vertical_layout_bounds_ticks(image->rows, (W-1)*4, H, transparent, false,
636 &image->layoutBoundsTop,
637 &image->layoutBoundsBottom, &errorMsg);
638
639 image->haveLayoutBounds = image->layoutBoundsLeft != 0
640 || image->layoutBoundsRight != 0
641 || image->layoutBoundsTop != 0
642 || image->layoutBoundsBottom != 0;
643
644 if (image->haveLayoutBounds) {
645 if (kIsDebug) {
646 printf("layoutBounds=%d %d %d %d\n", image->layoutBoundsLeft, image->layoutBoundsTop,
647 image->layoutBoundsRight, image->layoutBoundsBottom);
648 }
649 }
650
651 // use opacity of pixels to estimate the round rect outline
652 get_outline(image);
653
654 // If padding is not yet specified, take values from size.
655 if (image->info9Patch.paddingLeft < 0) {
656 image->info9Patch.paddingLeft = xDivs[0];
657 image->info9Patch.paddingRight = W - 2 - xDivs[1];
658 } else {
659 // Adjust value to be correct!
660 image->info9Patch.paddingRight = W - 2 - image->info9Patch.paddingRight;
661 }
662 if (image->info9Patch.paddingTop < 0) {
663 image->info9Patch.paddingTop = yDivs[0];
664 image->info9Patch.paddingBottom = H - 2 - yDivs[1];
665 } else {
666 // Adjust value to be correct!
667 image->info9Patch.paddingBottom = H - 2 - image->info9Patch.paddingBottom;
668 }
669
670 if (kIsDebug) {
671 printf("Size ticks for %s: x0=%d, x1=%d, y0=%d, y1=%d\n", imageName,
672 xDivs[0], xDivs[1],
673 yDivs[0], yDivs[1]);
674 printf("padding ticks for %s: l=%d, r=%d, t=%d, b=%d\n", imageName,
675 image->info9Patch.paddingLeft, image->info9Patch.paddingRight,
676 image->info9Patch.paddingTop, image->info9Patch.paddingBottom);
677 }
678
679 // Remove frame from image.
680 image->rows = (png_bytepp)malloc((H-2) * sizeof(png_bytep));
681 for (i=0; i<(H-2); i++) {
682 image->rows[i] = image->allocRows[i+1];
683 memmove(image->rows[i], image->rows[i]+4, (W-2)*4);
684 }
685 image->width -= 2;
686 W = image->width;
687 image->height -= 2;
688 H = image->height;
689
690 // Figure out the number of rows and columns in the N-patch
691 numCols = numXDivs + 1;
692 if (xDivs[0] == 0) { // Column 1 is strechable
693 numCols--;
694 }
695 if (xDivs[numXDivs - 1] == W) {
696 numCols--;
697 }
698 numRows = numYDivs + 1;
699 if (yDivs[0] == 0) { // Row 1 is strechable
700 numRows--;
701 }
702 if (yDivs[numYDivs - 1] == H) {
703 numRows--;
704 }
705
706 // Make sure the amount of rows and columns will fit in the number of
707 // colors we can use in the 9-patch format.
708 if (numRows * numCols > 0x7F) {
709 errorMsg = "Too many rows and columns in 9-patch perimeter";
710 goto getout;
711 }
712
713 numColors = numRows * numCols;
714 image->info9Patch.numColors = numColors;
715 image->colors = (uint32_t*)malloc(numColors * sizeof(uint32_t));
716
717 // Fill in color information for each patch.
718
719 uint32_t c;
720 top = 0;
721
722 // The first row always starts with the top being at y=0 and the bottom
723 // being either yDivs[1] (if yDivs[0]=0) of yDivs[0]. In the former case
724 // the first row is stretchable along the Y axis, otherwise it is fixed.
725 // The last row always ends with the bottom being bitmap.height and the top
726 // being either yDivs[numYDivs-2] (if yDivs[numYDivs-1]=bitmap.height) or
727 // yDivs[numYDivs-1]. In the former case the last row is stretchable along
728 // the Y axis, otherwise it is fixed.
729 //
730 // The first and last columns are similarly treated with respect to the X
731 // axis.
732 //
733 // The above is to help explain some of the special casing that goes on the
734 // code below.
735
736 // The initial yDiv and whether the first row is considered stretchable or
737 // not depends on whether yDiv[0] was zero or not.
738 for (j = (yDivs[0] == 0 ? 1 : 0);
739 j <= numYDivs && top < H;
740 j++) {
741 if (j == numYDivs) {
742 bottom = H;
743 } else {
744 bottom = yDivs[j];
745 }
746 left = 0;
747 // The initial xDiv and whether the first column is considered
748 // stretchable or not depends on whether xDiv[0] was zero or not.
749 for (i = xDivs[0] == 0 ? 1 : 0;
750 i <= numXDivs && left < W;
751 i++) {
752 if (i == numXDivs) {
753 right = W;
754 } else {
755 right = xDivs[i];
756 }
757 c = get_color(image->rows, left, top, right - 1, bottom - 1);
758 image->colors[colorIndex++] = c;
759 if (kIsDebug) {
760 if (c != Res_png_9patch::NO_COLOR)
761 hasColor = true;
762 }
763 left = right;
764 }
765 top = bottom;
766 }
767
768 assert(colorIndex == numColors);
769
770 for (i=0; i<numColors; i++) {
771 if (hasColor) {
772 if (i == 0) printf("Colors in %s:\n ", imageName);
773 printf(" #%08x", image->colors[i]);
774 if (i == numColors - 1) printf("\n");
775 }
776 }
777 getout:
778 if (errorMsg) {
779 fprintf(stderr,
780 "ERROR: 9-patch image %s malformed.\n"
781 " %s.\n", imageName, errorMsg);
782 if (errorEdge != NULL) {
783 if (errorPixel >= 0) {
784 fprintf(stderr,
785 " Found at pixel #%d along %s edge.\n", errorPixel, errorEdge);
786 } else {
787 fprintf(stderr,
788 " Found along %s edge.\n", errorEdge);
789 }
790 }
791 return UNKNOWN_ERROR;
792 }
793 return NO_ERROR;
794 }
795
checkNinePatchSerialization(Res_png_9patch * inPatch,void * data)796 static void checkNinePatchSerialization(Res_png_9patch* inPatch, void* data)
797 {
798 size_t patchSize = inPatch->serializedSize();
799 void* newData = malloc(patchSize);
800 memcpy(newData, data, patchSize);
801 Res_png_9patch* outPatch = inPatch->deserialize(newData);
802 // deserialization is done in place, so outPatch == newData
803 assert(outPatch == newData);
804 assert(outPatch->numXDivs == inPatch->numXDivs);
805 assert(outPatch->numYDivs == inPatch->numYDivs);
806 assert(outPatch->paddingLeft == inPatch->paddingLeft);
807 assert(outPatch->paddingRight == inPatch->paddingRight);
808 assert(outPatch->paddingTop == inPatch->paddingTop);
809 assert(outPatch->paddingBottom == inPatch->paddingBottom);
810 for (int i = 0; i < outPatch->numXDivs; i++) {
811 assert(outPatch->xDivs[i] == inPatch->xDivs[i]);
812 }
813 for (int i = 0; i < outPatch->numYDivs; i++) {
814 assert(outPatch->yDivs[i] == inPatch->yDivs[i]);
815 }
816 for (int i = 0; i < outPatch->numColors; i++) {
817 assert(outPatch->colors[i] == inPatch->colors[i]);
818 }
819 free(newData);
820 }
821
dump_image(int w,int h,png_bytepp rows,int color_type)822 static void dump_image(int w, int h, png_bytepp rows, int color_type)
823 {
824 int i, j, rr, gg, bb, aa;
825
826 int bpp;
827 if (color_type == PNG_COLOR_TYPE_PALETTE || color_type == PNG_COLOR_TYPE_GRAY) {
828 bpp = 1;
829 } else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
830 bpp = 2;
831 } else if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
832 // We use a padding byte even when there is no alpha
833 bpp = 4;
834 } else {
835 printf("Unknown color type %d.\n", color_type);
836 }
837
838 for (j = 0; j < h; j++) {
839 png_bytep row = rows[j];
840 for (i = 0; i < w; i++) {
841 rr = row[0];
842 gg = row[1];
843 bb = row[2];
844 aa = row[3];
845 row += bpp;
846
847 if (i == 0) {
848 printf("Row %d:", j);
849 }
850 switch (bpp) {
851 case 1:
852 printf(" (%d)", rr);
853 break;
854 case 2:
855 printf(" (%d %d", rr, gg);
856 break;
857 case 3:
858 printf(" (%d %d %d)", rr, gg, bb);
859 break;
860 case 4:
861 printf(" (%d %d %d %d)", rr, gg, bb, aa);
862 break;
863 }
864 if (i == (w - 1)) {
865 printf("\n");
866 }
867 }
868 }
869 }
870
871 #define MAX(a,b) ((a)>(b)?(a):(b))
872 #define ABS(a) ((a)<0?-(a):(a))
873
analyze_image(const char * imageName,image_info & imageInfo,int grayscaleTolerance,png_colorp rgbPalette,png_bytep alphaPalette,int * paletteEntries,bool * hasTransparency,int * colorType,png_bytepp outRows)874 static void analyze_image(const char *imageName, image_info &imageInfo, int grayscaleTolerance,
875 png_colorp rgbPalette, png_bytep alphaPalette,
876 int *paletteEntries, bool *hasTransparency, int *colorType,
877 png_bytepp outRows)
878 {
879 int w = imageInfo.width;
880 int h = imageInfo.height;
881 int i, j, rr, gg, bb, aa, idx;
882 uint32_t colors[256], col;
883 int num_colors = 0;
884 int maxGrayDeviation = 0;
885
886 bool isOpaque = true;
887 bool isPalette = true;
888 bool isGrayscale = true;
889
890 // Scan the entire image and determine if:
891 // 1. Every pixel has R == G == B (grayscale)
892 // 2. Every pixel has A == 255 (opaque)
893 // 3. There are no more than 256 distinct RGBA colors
894
895 if (kIsDebug) {
896 printf("Initial image data:\n");
897 dump_image(w, h, imageInfo.rows, PNG_COLOR_TYPE_RGB_ALPHA);
898 }
899
900 for (j = 0; j < h; j++) {
901 png_bytep row = imageInfo.rows[j];
902 png_bytep out = outRows[j];
903 for (i = 0; i < w; i++) {
904 rr = *row++;
905 gg = *row++;
906 bb = *row++;
907 aa = *row++;
908
909 int odev = maxGrayDeviation;
910 maxGrayDeviation = MAX(ABS(rr - gg), maxGrayDeviation);
911 maxGrayDeviation = MAX(ABS(gg - bb), maxGrayDeviation);
912 maxGrayDeviation = MAX(ABS(bb - rr), maxGrayDeviation);
913 if (maxGrayDeviation > odev) {
914 if (kIsDebug) {
915 printf("New max dev. = %d at pixel (%d, %d) = (%d %d %d %d)\n",
916 maxGrayDeviation, i, j, rr, gg, bb, aa);
917 }
918 }
919
920 // Check if image is really grayscale
921 if (isGrayscale) {
922 if (rr != gg || rr != bb) {
923 if (kIsDebug) {
924 printf("Found a non-gray pixel at %d, %d = (%d %d %d %d)\n",
925 i, j, rr, gg, bb, aa);
926 }
927 isGrayscale = false;
928 }
929 }
930
931 // Check if image is really opaque
932 if (isOpaque) {
933 if (aa != 0xff) {
934 if (kIsDebug) {
935 printf("Found a non-opaque pixel at %d, %d = (%d %d %d %d)\n",
936 i, j, rr, gg, bb, aa);
937 }
938 isOpaque = false;
939 }
940 }
941
942 // Check if image is really <= 256 colors
943 if (isPalette) {
944 col = (uint32_t) ((rr << 24) | (gg << 16) | (bb << 8) | aa);
945 bool match = false;
946 for (idx = 0; idx < num_colors; idx++) {
947 if (colors[idx] == col) {
948 match = true;
949 break;
950 }
951 }
952
953 // Write the palette index for the pixel to outRows optimistically
954 // We might overwrite it later if we decide to encode as gray or
955 // gray + alpha
956 *out++ = idx;
957 if (!match) {
958 if (num_colors == 256) {
959 if (kIsDebug) {
960 printf("Found 257th color at %d, %d\n", i, j);
961 }
962 isPalette = false;
963 } else {
964 colors[num_colors++] = col;
965 }
966 }
967 }
968 }
969 }
970
971 *paletteEntries = 0;
972 *hasTransparency = !isOpaque;
973 int bpp = isOpaque ? 3 : 4;
974 int paletteSize = w * h + bpp * num_colors;
975
976 if (kIsDebug) {
977 printf("isGrayscale = %s\n", isGrayscale ? "true" : "false");
978 printf("isOpaque = %s\n", isOpaque ? "true" : "false");
979 printf("isPalette = %s\n", isPalette ? "true" : "false");
980 printf("Size w/ palette = %d, gray+alpha = %d, rgb(a) = %d\n",
981 paletteSize, 2 * w * h, bpp * w * h);
982 printf("Max gray deviation = %d, tolerance = %d\n", maxGrayDeviation, grayscaleTolerance);
983 }
984
985 // Choose the best color type for the image.
986 // 1. Opaque gray - use COLOR_TYPE_GRAY at 1 byte/pixel
987 // 2. Gray + alpha - use COLOR_TYPE_PALETTE if the number of distinct combinations
988 // is sufficiently small, otherwise use COLOR_TYPE_GRAY_ALPHA
989 // 3. RGB(A) - use COLOR_TYPE_PALETTE if the number of distinct colors is sufficiently
990 // small, otherwise use COLOR_TYPE_RGB{_ALPHA}
991 if (isGrayscale) {
992 if (isOpaque) {
993 *colorType = PNG_COLOR_TYPE_GRAY; // 1 byte/pixel
994 } else {
995 // Use a simple heuristic to determine whether using a palette will
996 // save space versus using gray + alpha for each pixel.
997 // This doesn't take into account chunk overhead, filtering, LZ
998 // compression, etc.
999 if (isPalette && (paletteSize < 2 * w * h)) {
1000 *colorType = PNG_COLOR_TYPE_PALETTE; // 1 byte/pixel + 4 bytes/color
1001 } else {
1002 *colorType = PNG_COLOR_TYPE_GRAY_ALPHA; // 2 bytes per pixel
1003 }
1004 }
1005 } else if (isPalette && (paletteSize < bpp * w * h)) {
1006 *colorType = PNG_COLOR_TYPE_PALETTE;
1007 } else {
1008 if (maxGrayDeviation <= grayscaleTolerance) {
1009 printf("%s: forcing image to gray (max deviation = %d)\n", imageName, maxGrayDeviation);
1010 *colorType = isOpaque ? PNG_COLOR_TYPE_GRAY : PNG_COLOR_TYPE_GRAY_ALPHA;
1011 } else {
1012 *colorType = isOpaque ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA;
1013 }
1014 }
1015
1016 // Perform postprocessing of the image or palette data based on the final
1017 // color type chosen
1018
1019 if (*colorType == PNG_COLOR_TYPE_PALETTE) {
1020 // Create separate RGB and Alpha palettes and set the number of colors
1021 *paletteEntries = num_colors;
1022
1023 // Create the RGB and alpha palettes
1024 for (int idx = 0; idx < num_colors; idx++) {
1025 col = colors[idx];
1026 rgbPalette[idx].red = (png_byte) ((col >> 24) & 0xff);
1027 rgbPalette[idx].green = (png_byte) ((col >> 16) & 0xff);
1028 rgbPalette[idx].blue = (png_byte) ((col >> 8) & 0xff);
1029 alphaPalette[idx] = (png_byte) (col & 0xff);
1030 }
1031 } else if (*colorType == PNG_COLOR_TYPE_GRAY || *colorType == PNG_COLOR_TYPE_GRAY_ALPHA) {
1032 // If the image is gray or gray + alpha, compact the pixels into outRows
1033 for (j = 0; j < h; j++) {
1034 png_bytep row = imageInfo.rows[j];
1035 png_bytep out = outRows[j];
1036 for (i = 0; i < w; i++) {
1037 rr = *row++;
1038 gg = *row++;
1039 bb = *row++;
1040 aa = *row++;
1041
1042 if (isGrayscale) {
1043 *out++ = rr;
1044 } else {
1045 *out++ = (png_byte) (rr * 0.2126f + gg * 0.7152f + bb * 0.0722f);
1046 }
1047 if (!isOpaque) {
1048 *out++ = aa;
1049 }
1050 }
1051 }
1052 }
1053 }
1054
1055
write_png(const char * imageName,png_structp write_ptr,png_infop write_info,image_info & imageInfo,int grayscaleTolerance)1056 static void write_png(const char* imageName,
1057 png_structp write_ptr, png_infop write_info,
1058 image_info& imageInfo, int grayscaleTolerance)
1059 {
1060 png_uint_32 width, height;
1061 int color_type;
1062 int bit_depth, interlace_type, compression_type;
1063 int i;
1064
1065 png_unknown_chunk unknowns[3];
1066 unknowns[0].data = NULL;
1067 unknowns[1].data = NULL;
1068 unknowns[2].data = NULL;
1069
1070 png_bytepp outRows = (png_bytepp) malloc((int) imageInfo.height * sizeof(png_bytep));
1071 if (outRows == (png_bytepp) 0) {
1072 printf("Can't allocate output buffer!\n");
1073 exit(1);
1074 }
1075 for (i = 0; i < (int) imageInfo.height; i++) {
1076 outRows[i] = (png_bytep) malloc(2 * (int) imageInfo.width);
1077 if (outRows[i] == (png_bytep) 0) {
1078 printf("Can't allocate output buffer!\n");
1079 exit(1);
1080 }
1081 }
1082
1083 png_set_compression_level(write_ptr, Z_BEST_COMPRESSION);
1084
1085 if (kIsDebug) {
1086 printf("Writing image %s: w = %d, h = %d\n", imageName,
1087 (int) imageInfo.width, (int) imageInfo.height);
1088 }
1089
1090 png_color rgbPalette[256];
1091 png_byte alphaPalette[256];
1092 bool hasTransparency;
1093 int paletteEntries;
1094
1095 analyze_image(imageName, imageInfo, grayscaleTolerance, rgbPalette, alphaPalette,
1096 &paletteEntries, &hasTransparency, &color_type, outRows);
1097
1098 // If the image is a 9-patch, we need to preserve it as a ARGB file to make
1099 // sure the pixels will not be pre-dithered/clamped until we decide they are
1100 if (imageInfo.is9Patch && (color_type == PNG_COLOR_TYPE_RGB ||
1101 color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_PALETTE)) {
1102 color_type = PNG_COLOR_TYPE_RGB_ALPHA;
1103 }
1104
1105 if (kIsDebug) {
1106 switch (color_type) {
1107 case PNG_COLOR_TYPE_PALETTE:
1108 printf("Image %s has %d colors%s, using PNG_COLOR_TYPE_PALETTE\n",
1109 imageName, paletteEntries,
1110 hasTransparency ? " (with alpha)" : "");
1111 break;
1112 case PNG_COLOR_TYPE_GRAY:
1113 printf("Image %s is opaque gray, using PNG_COLOR_TYPE_GRAY\n", imageName);
1114 break;
1115 case PNG_COLOR_TYPE_GRAY_ALPHA:
1116 printf("Image %s is gray + alpha, using PNG_COLOR_TYPE_GRAY_ALPHA\n", imageName);
1117 break;
1118 case PNG_COLOR_TYPE_RGB:
1119 printf("Image %s is opaque RGB, using PNG_COLOR_TYPE_RGB\n", imageName);
1120 break;
1121 case PNG_COLOR_TYPE_RGB_ALPHA:
1122 printf("Image %s is RGB + alpha, using PNG_COLOR_TYPE_RGB_ALPHA\n", imageName);
1123 break;
1124 }
1125 }
1126
1127 png_set_IHDR(write_ptr, write_info, imageInfo.width, imageInfo.height,
1128 8, color_type, PNG_INTERLACE_NONE,
1129 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1130
1131 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1132 png_set_PLTE(write_ptr, write_info, rgbPalette, paletteEntries);
1133 if (hasTransparency) {
1134 png_set_tRNS(write_ptr, write_info, alphaPalette, paletteEntries, (png_color_16p) 0);
1135 }
1136 png_set_filter(write_ptr, 0, PNG_NO_FILTERS);
1137 } else {
1138 png_set_filter(write_ptr, 0, PNG_ALL_FILTERS);
1139 }
1140
1141 if (imageInfo.is9Patch) {
1142 int chunk_count = 2 + (imageInfo.haveLayoutBounds ? 1 : 0);
1143 int p_index = imageInfo.haveLayoutBounds ? 2 : 1;
1144 int b_index = 1;
1145 int o_index = 0;
1146
1147 // Chunks ordered thusly because older platforms depend on the base 9 patch data being last
1148 png_byte *chunk_names = imageInfo.haveLayoutBounds
1149 ? (png_byte*)"npOl\0npLb\0npTc\0"
1150 : (png_byte*)"npOl\0npTc";
1151
1152 // base 9 patch data
1153 if (kIsDebug) {
1154 printf("Adding 9-patch info...\n");
1155 }
1156 strcpy((char*)unknowns[p_index].name, "npTc");
1157 unknowns[p_index].data = (png_byte*)imageInfo.serialize9patch();
1158 unknowns[p_index].size = imageInfo.info9Patch.serializedSize();
1159 // TODO: remove the check below when everything works
1160 checkNinePatchSerialization(&imageInfo.info9Patch, unknowns[p_index].data);
1161
1162 // automatically generated 9 patch outline data
1163 int chunk_size = sizeof(png_uint_32) * 6;
1164 strcpy((char*)unknowns[o_index].name, "npOl");
1165 unknowns[o_index].data = (png_byte*) calloc(chunk_size, 1);
1166 png_byte outputData[chunk_size];
1167 memcpy(&outputData, &imageInfo.outlineInsetsLeft, 4 * sizeof(png_uint_32));
1168 ((float*) outputData)[4] = imageInfo.outlineRadius;
1169 ((png_uint_32*) outputData)[5] = imageInfo.outlineAlpha;
1170 memcpy(unknowns[o_index].data, &outputData, chunk_size);
1171 unknowns[o_index].size = chunk_size;
1172
1173 // optional optical inset / layout bounds data
1174 if (imageInfo.haveLayoutBounds) {
1175 int chunk_size = sizeof(png_uint_32) * 4;
1176 strcpy((char*)unknowns[b_index].name, "npLb");
1177 unknowns[b_index].data = (png_byte*) calloc(chunk_size, 1);
1178 memcpy(unknowns[b_index].data, &imageInfo.layoutBoundsLeft, chunk_size);
1179 unknowns[b_index].size = chunk_size;
1180 }
1181
1182 for (int i = 0; i < chunk_count; i++) {
1183 unknowns[i].location = PNG_HAVE_PLTE;
1184 }
1185 png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS,
1186 chunk_names, chunk_count);
1187 png_set_unknown_chunks(write_ptr, write_info, unknowns, chunk_count);
1188 #if PNG_LIBPNG_VER < 10600
1189 /* Deal with unknown chunk location bug in 1.5.x and earlier */
1190 png_set_unknown_chunk_location(write_ptr, write_info, 0, PNG_HAVE_PLTE);
1191 if (imageInfo.haveLayoutBounds) {
1192 png_set_unknown_chunk_location(write_ptr, write_info, 1, PNG_HAVE_PLTE);
1193 }
1194 #endif
1195 }
1196
1197
1198 png_write_info(write_ptr, write_info);
1199
1200 png_bytepp rows;
1201 if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
1202 if (color_type == PNG_COLOR_TYPE_RGB) {
1203 png_set_filler(write_ptr, 0, PNG_FILLER_AFTER);
1204 }
1205 rows = imageInfo.rows;
1206 } else {
1207 rows = outRows;
1208 }
1209 png_write_image(write_ptr, rows);
1210
1211 if (kIsDebug) {
1212 printf("Final image data:\n");
1213 dump_image(imageInfo.width, imageInfo.height, rows, color_type);
1214 }
1215
1216 png_write_end(write_ptr, write_info);
1217
1218 for (i = 0; i < (int) imageInfo.height; i++) {
1219 free(outRows[i]);
1220 }
1221 free(outRows);
1222 free(unknowns[0].data);
1223 free(unknowns[1].data);
1224 free(unknowns[2].data);
1225
1226 png_get_IHDR(write_ptr, write_info, &width, &height,
1227 &bit_depth, &color_type, &interlace_type,
1228 &compression_type, NULL);
1229
1230 if (kIsDebug) {
1231 printf("Image written: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n",
1232 (int)width, (int)height, bit_depth, color_type, interlace_type,
1233 compression_type);
1234 }
1235 }
1236
read_png_protected(png_structp read_ptr,String8 & printableName,png_infop read_info,const sp<AaptFile> & file,FILE * fp,image_info * imageInfo)1237 static bool read_png_protected(png_structp read_ptr, String8& printableName, png_infop read_info,
1238 const sp<AaptFile>& file, FILE* fp, image_info* imageInfo) {
1239 if (setjmp(png_jmpbuf(read_ptr))) {
1240 return false;
1241 }
1242
1243 png_init_io(read_ptr, fp);
1244
1245 read_png(printableName.string(), read_ptr, read_info, imageInfo);
1246
1247 const size_t nameLen = file->getPath().length();
1248 if (nameLen > 6) {
1249 const char* name = file->getPath().string();
1250 if (name[nameLen-5] == '9' && name[nameLen-6] == '.') {
1251 if (do_9patch(printableName.string(), imageInfo) != NO_ERROR) {
1252 return false;
1253 }
1254 }
1255 }
1256
1257 return true;
1258 }
1259
write_png_protected(png_structp write_ptr,String8 & printableName,png_infop write_info,image_info * imageInfo,const Bundle * bundle)1260 static bool write_png_protected(png_structp write_ptr, String8& printableName, png_infop write_info,
1261 image_info* imageInfo, const Bundle* bundle) {
1262 if (setjmp(png_jmpbuf(write_ptr))) {
1263 return false;
1264 }
1265
1266 write_png(printableName.string(), write_ptr, write_info, *imageInfo,
1267 bundle->getGrayscaleTolerance());
1268
1269 return true;
1270 }
1271
preProcessImage(const Bundle * bundle,const sp<AaptAssets> &,const sp<AaptFile> & file,String8 *)1272 status_t preProcessImage(const Bundle* bundle, const sp<AaptAssets>& /* assets */,
1273 const sp<AaptFile>& file, String8* /* outNewLeafName */)
1274 {
1275 String8 ext(file->getPath().getPathExtension());
1276
1277 // We currently only process PNG images.
1278 if (strcmp(ext.string(), ".png") != 0) {
1279 return NO_ERROR;
1280 }
1281
1282 // Example of renaming a file:
1283 //*outNewLeafName = file->getPath().getBasePath().getFileName();
1284 //outNewLeafName->append(".nupng");
1285
1286 String8 printableName(file->getPrintableSource());
1287
1288 if (bundle->getVerbose()) {
1289 printf("Processing image: %s\n", printableName.string());
1290 }
1291
1292 png_structp read_ptr = NULL;
1293 png_infop read_info = NULL;
1294 FILE* fp;
1295
1296 image_info imageInfo;
1297
1298 png_structp write_ptr = NULL;
1299 png_infop write_info = NULL;
1300
1301 status_t error = UNKNOWN_ERROR;
1302
1303 fp = fopen(file->getSourceFile().string(), "rb");
1304 if (fp == NULL) {
1305 fprintf(stderr, "%s: ERROR: Unable to open PNG file\n", printableName.string());
1306 goto bail;
1307 }
1308
1309 read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, (png_error_ptr)NULL,
1310 (png_error_ptr)NULL);
1311 if (!read_ptr) {
1312 goto bail;
1313 }
1314
1315 read_info = png_create_info_struct(read_ptr);
1316 if (!read_info) {
1317 goto bail;
1318 }
1319
1320 if (!read_png_protected(read_ptr, printableName, read_info, file, fp, &imageInfo)) {
1321 goto bail;
1322 }
1323
1324 write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, (png_error_ptr)NULL,
1325 (png_error_ptr)NULL);
1326 if (!write_ptr)
1327 {
1328 goto bail;
1329 }
1330
1331 write_info = png_create_info_struct(write_ptr);
1332 if (!write_info)
1333 {
1334 goto bail;
1335 }
1336
1337 png_set_write_fn(write_ptr, (void*)file.get(),
1338 png_write_aapt_file, png_flush_aapt_file);
1339
1340 if (!write_png_protected(write_ptr, printableName, write_info, &imageInfo, bundle)) {
1341 goto bail;
1342 }
1343
1344 error = NO_ERROR;
1345
1346 if (bundle->getVerbose()) {
1347 fseek(fp, 0, SEEK_END);
1348 size_t oldSize = (size_t)ftell(fp);
1349 size_t newSize = file->getSize();
1350 float factor = ((float)newSize)/oldSize;
1351 int percent = (int)(factor*100);
1352 printf(" (processed image %s: %d%% size of source)\n", printableName.string(), percent);
1353 }
1354
1355 bail:
1356 if (read_ptr) {
1357 png_destroy_read_struct(&read_ptr, &read_info, (png_infopp)NULL);
1358 }
1359 if (fp) {
1360 fclose(fp);
1361 }
1362 if (write_ptr) {
1363 png_destroy_write_struct(&write_ptr, &write_info);
1364 }
1365
1366 if (error != NO_ERROR) {
1367 fprintf(stderr, "ERROR: Failure processing PNG image %s\n",
1368 file->getPrintableSource().string());
1369 }
1370 return error;
1371 }
1372
preProcessImageToCache(const Bundle * bundle,const String8 & source,const String8 & dest)1373 status_t preProcessImageToCache(const Bundle* bundle, const String8& source, const String8& dest)
1374 {
1375 png_structp read_ptr = NULL;
1376 png_infop read_info = NULL;
1377
1378 FILE* fp;
1379
1380 image_info imageInfo;
1381
1382 png_structp write_ptr = NULL;
1383 png_infop write_info = NULL;
1384
1385 status_t error = UNKNOWN_ERROR;
1386
1387 if (bundle->getVerbose()) {
1388 printf("Processing image to cache: %s => %s\n", source.string(), dest.string());
1389 }
1390
1391 // Get a file handler to read from
1392 fp = fopen(source.string(),"rb");
1393 if (fp == NULL) {
1394 fprintf(stderr, "%s ERROR: Unable to open PNG file\n", source.string());
1395 return error;
1396 }
1397
1398 // Call libpng to get a struct to read image data into
1399 read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
1400 if (!read_ptr) {
1401 fclose(fp);
1402 png_destroy_read_struct(&read_ptr, &read_info,NULL);
1403 return error;
1404 }
1405
1406 // Call libpng to get a struct to read image info into
1407 read_info = png_create_info_struct(read_ptr);
1408 if (!read_info) {
1409 fclose(fp);
1410 png_destroy_read_struct(&read_ptr, &read_info,NULL);
1411 return error;
1412 }
1413
1414 // Set a jump point for libpng to long jump back to on error
1415 if (setjmp(png_jmpbuf(read_ptr))) {
1416 fclose(fp);
1417 png_destroy_read_struct(&read_ptr, &read_info,NULL);
1418 return error;
1419 }
1420
1421 // Set up libpng to read from our file.
1422 png_init_io(read_ptr,fp);
1423
1424 // Actually read data from the file
1425 read_png(source.string(), read_ptr, read_info, &imageInfo);
1426
1427 // We're done reading so we can clean up
1428 // Find old file size before releasing handle
1429 fseek(fp, 0, SEEK_END);
1430 size_t oldSize = (size_t)ftell(fp);
1431 fclose(fp);
1432 png_destroy_read_struct(&read_ptr, &read_info,NULL);
1433
1434 // Check to see if we're dealing with a 9-patch
1435 // If we are, process appropriately
1436 if (source.getBasePath().getPathExtension() == ".9") {
1437 if (do_9patch(source.string(), &imageInfo) != NO_ERROR) {
1438 return error;
1439 }
1440 }
1441
1442 // Call libpng to create a structure to hold the processed image data
1443 // that can be written to disk
1444 write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
1445 if (!write_ptr) {
1446 png_destroy_write_struct(&write_ptr, &write_info);
1447 return error;
1448 }
1449
1450 // Call libpng to create a structure to hold processed image info that can
1451 // be written to disk
1452 write_info = png_create_info_struct(write_ptr);
1453 if (!write_info) {
1454 png_destroy_write_struct(&write_ptr, &write_info);
1455 return error;
1456 }
1457
1458 // Open up our destination file for writing
1459 fp = fopen(dest.string(), "wb");
1460 if (!fp) {
1461 fprintf(stderr, "%s ERROR: Unable to open PNG file\n", dest.string());
1462 png_destroy_write_struct(&write_ptr, &write_info);
1463 return error;
1464 }
1465
1466 // Set up libpng to write to our file
1467 png_init_io(write_ptr, fp);
1468
1469 // Set up a jump for libpng to long jump back on on errors
1470 if (setjmp(png_jmpbuf(write_ptr))) {
1471 fclose(fp);
1472 png_destroy_write_struct(&write_ptr, &write_info);
1473 return error;
1474 }
1475
1476 // Actually write out to the new png
1477 write_png(dest.string(), write_ptr, write_info, imageInfo,
1478 bundle->getGrayscaleTolerance());
1479
1480 if (bundle->getVerbose()) {
1481 // Find the size of our new file
1482 FILE* reader = fopen(dest.string(), "rb");
1483 fseek(reader, 0, SEEK_END);
1484 size_t newSize = (size_t)ftell(reader);
1485 fclose(reader);
1486
1487 float factor = ((float)newSize)/oldSize;
1488 int percent = (int)(factor*100);
1489 printf(" (processed image to cache entry %s: %d%% size of source)\n",
1490 dest.string(), percent);
1491 }
1492
1493 //Clean up
1494 fclose(fp);
1495 png_destroy_write_struct(&write_ptr, &write_info);
1496
1497 return NO_ERROR;
1498 }
1499
postProcessImage(const Bundle * bundle,const sp<AaptAssets> & assets,ResourceTable * table,const sp<AaptFile> & file)1500 status_t postProcessImage(const Bundle* bundle, const sp<AaptAssets>& assets,
1501 ResourceTable* table, const sp<AaptFile>& file)
1502 {
1503 String8 ext(file->getPath().getPathExtension());
1504
1505 // At this point, now that we have all the resource data, all we need to
1506 // do is compile XML files.
1507 if (strcmp(ext.string(), ".xml") == 0) {
1508 String16 resourceName(parseResourceName(file->getSourceFile().getPathLeaf()));
1509 return compileXmlFile(bundle, assets, resourceName, file, table);
1510 }
1511
1512 return NO_ERROR;
1513 }
1514