This repository has been archived by the owner on Dec 15, 2017. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 6
/
Images.cpp
1596 lines (1374 loc) · 52.2 KB
/
Images.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//
// Copyright 2006 The Android Open Source Project
//
// Build resource files from raw assets.
//
#define PNG_INTERNAL
#include "Images.h"
#include <androidfw/ResourceTypes.h>
#include <utils/ByteOrder.h>
#include <png.h>
#include <zlib.h>
// Change this to true for noisy debug output.
static const bool kIsDebug = false;
static void
png_write_aopt_file(png_structp png_ptr, png_bytep data, png_size_t length)
{
AoptFile* aoptfile = (AoptFile*) png_get_io_ptr(png_ptr);
status_t err = aoptfile->writeData(data, length);
if (err != NO_ERROR) {
png_error(png_ptr, "Write Error");
}
}
static void
png_flush_aopt_file(png_structp /* png_ptr */)
{
}
// This holds an image as 8bpp RGBA.
struct image_info
{
image_info() : rows(NULL), is9Patch(false),
xDivs(NULL), yDivs(NULL), colors(NULL), allocRows(NULL) { }
~image_info() {
if (rows && rows != allocRows) {
free(rows);
}
if (allocRows) {
for (int i=0; i<(int)allocHeight; i++) {
free(allocRows[i]);
}
free(allocRows);
}
free(xDivs);
free(yDivs);
free(colors);
}
void* serialize9patch() {
void* serialized = Res_png_9patch::serialize(info9Patch, xDivs, yDivs, colors);
reinterpret_cast<Res_png_9patch*>(serialized)->deviceToFile();
return serialized;
}
png_uint_32 width;
png_uint_32 height;
png_bytepp rows;
// 9-patch info.
bool is9Patch;
Res_png_9patch info9Patch;
int32_t* xDivs;
int32_t* yDivs;
uint32_t* colors;
// Layout padding, if relevant
bool haveLayoutBounds;
int32_t layoutBoundsLeft;
int32_t layoutBoundsTop;
int32_t layoutBoundsRight;
int32_t layoutBoundsBottom;
// Round rect outline description
int32_t outlineInsetsLeft;
int32_t outlineInsetsTop;
int32_t outlineInsetsRight;
int32_t outlineInsetsBottom;
float outlineRadius;
uint8_t outlineAlpha;
png_uint_32 allocHeight;
png_bytepp allocRows;
};
static void log_warning(png_structp png_ptr, png_const_charp warning_message)
{
const char* imageName = (const char*) png_get_error_ptr(png_ptr);
fprintf(stderr, "%s: libpng warning: %s\n", imageName, warning_message);
}
static void read_png(const char* imageName,
png_structp read_ptr, png_infop read_info,
image_info* outImageInfo)
{
int color_type;
int bit_depth, interlace_type, compression_type;
int i;
png_set_error_fn(read_ptr, const_cast<char*>(imageName),
NULL /* use default errorfn */, log_warning);
png_read_info(read_ptr, read_info);
png_get_IHDR(read_ptr, read_info, &outImageInfo->width,
&outImageInfo->height, &bit_depth, &color_type,
&interlace_type, &compression_type, NULL);
//printf("Image %s:\n", imageName);
//printf("color_type=%d, bit_depth=%d, interlace_type=%d, compression_type=%d\n",
// color_type, bit_depth, interlace_type, compression_type);
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(read_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand_gray_1_2_4_to_8(read_ptr);
if (png_get_valid(read_ptr, read_info, PNG_INFO_tRNS)) {
//printf("Has PNG_INFO_tRNS!\n");
png_set_tRNS_to_alpha(read_ptr);
}
if (bit_depth == 16)
png_set_strip_16(read_ptr);
if ((color_type&PNG_COLOR_MASK_ALPHA) == 0)
png_set_add_alpha(read_ptr, 0xFF, PNG_FILLER_AFTER);
if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(read_ptr);
png_set_interlace_handling(read_ptr);
png_read_update_info(read_ptr, read_info);
outImageInfo->rows = (png_bytepp)malloc(
outImageInfo->height * sizeof(png_bytep));
outImageInfo->allocHeight = outImageInfo->height;
outImageInfo->allocRows = outImageInfo->rows;
png_set_rows(read_ptr, read_info, outImageInfo->rows);
for (i = 0; i < (int)outImageInfo->height; i++)
{
outImageInfo->rows[i] = (png_bytep)
malloc(png_get_rowbytes(read_ptr, read_info));
}
png_read_image(read_ptr, outImageInfo->rows);
png_read_end(read_ptr, read_info);
if (kIsDebug) {
printf("Image %s: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n",
imageName,
(int)outImageInfo->width, (int)outImageInfo->height,
bit_depth, color_type,
interlace_type, compression_type);
}
png_get_IHDR(read_ptr, read_info, &outImageInfo->width,
&outImageInfo->height, &bit_depth, &color_type,
&interlace_type, &compression_type, NULL);
}
#define COLOR_TRANSPARENT 0
#define COLOR_WHITE 0xFFFFFFFF
#define COLOR_TICK 0xFF000000
#define COLOR_LAYOUT_BOUNDS_TICK 0xFF0000FF
enum {
TICK_TYPE_NONE,
TICK_TYPE_TICK,
TICK_TYPE_LAYOUT_BOUNDS,
TICK_TYPE_BOTH
};
static int tick_type(png_bytep p, bool transparent, const char** outError)
{
png_uint_32 color = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
if (transparent) {
if (p[3] == 0) {
return TICK_TYPE_NONE;
}
if (color == COLOR_LAYOUT_BOUNDS_TICK) {
return TICK_TYPE_LAYOUT_BOUNDS;
}
if (color == COLOR_TICK) {
return TICK_TYPE_TICK;
}
// Error cases
if (p[3] != 0xff) {
*outError = "Frame pixels must be either solid or transparent (not intermediate alphas)";
return TICK_TYPE_NONE;
}
if (p[0] != 0 || p[1] != 0 || p[2] != 0) {
*outError = "Ticks in transparent frame must be black or red";
}
return TICK_TYPE_TICK;
}
if (p[3] != 0xFF) {
*outError = "White frame must be a solid color (no alpha)";
}
if (color == COLOR_WHITE) {
return TICK_TYPE_NONE;
}
if (color == COLOR_TICK) {
return TICK_TYPE_TICK;
}
if (color == COLOR_LAYOUT_BOUNDS_TICK) {
return TICK_TYPE_LAYOUT_BOUNDS;
}
if (p[0] != 0 || p[1] != 0 || p[2] != 0) {
*outError = "Ticks in white frame must be black or red";
return TICK_TYPE_NONE;
}
return TICK_TYPE_TICK;
}
enum {
TICK_START,
TICK_INSIDE_1,
TICK_OUTSIDE_1
};
static status_t 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)
{
int i;
*outLeft = *outRight = -1;
int state = TICK_START;
bool found = false;
for (i=1; i<width-1; i++) {
if (TICK_TYPE_TICK == tick_type(row+i*4, transparent, outError)) {
if (state == TICK_START ||
(state == TICK_OUTSIDE_1 && multipleAllowed)) {
*outLeft = i-1;
*outRight = width-2;
found = true;
if (outDivs != NULL) {
*outDivs += 2;
}
state = TICK_INSIDE_1;
} else if (state == TICK_OUTSIDE_1) {
*outError = "Can't have more than one marked region along edge";
*outLeft = i;
return UNKNOWN_ERROR;
}
} else if (*outError == NULL) {
if (state == TICK_INSIDE_1) {
// We're done with this div. Move on to the next.
*outRight = i-1;
outRight += 2;
outLeft += 2;
state = TICK_OUTSIDE_1;
}
} else {
*outLeft = i;
return UNKNOWN_ERROR;
}
}
if (required && !found) {
*outError = "No marked region found along edge";
*outLeft = -1;
return UNKNOWN_ERROR;
}
return NO_ERROR;
}
static status_t 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)
{
int i;
*outTop = *outBottom = -1;
int state = TICK_START;
bool found = false;
for (i=1; i<height-1; i++) {
if (TICK_TYPE_TICK == tick_type(rows[i]+offset, transparent, outError)) {
if (state == TICK_START ||
(state == TICK_OUTSIDE_1 && multipleAllowed)) {
*outTop = i-1;
*outBottom = height-2;
found = true;
if (outDivs != NULL) {
*outDivs += 2;
}
state = TICK_INSIDE_1;
} else if (state == TICK_OUTSIDE_1) {
*outError = "Can't have more than one marked region along edge";
*outTop = i;
return UNKNOWN_ERROR;
}
} else if (*outError == NULL) {
if (state == TICK_INSIDE_1) {
// We're done with this div. Move on to the next.
*outBottom = i-1;
outTop += 2;
outBottom += 2;
state = TICK_OUTSIDE_1;
}
} else {
*outTop = i;
return UNKNOWN_ERROR;
}
}
if (required && !found) {
*outError = "No marked region found along edge";
*outTop = -1;
return UNKNOWN_ERROR;
}
return NO_ERROR;
}
static status_t get_horizontal_layout_bounds_ticks(
png_bytep row, int width, bool transparent, bool /* required */,
int32_t* outLeft, int32_t* outRight, const char** outError)
{
int i;
*outLeft = *outRight = 0;
// Look for left tick
if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(row + 4, transparent, outError)) {
// Starting with a layout padding tick
i = 1;
while (i < width - 1) {
(*outLeft)++;
i++;
int tick = tick_type(row + i * 4, transparent, outError);
if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
break;
}
}
}
// Look for right tick
if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(row + (width - 2) * 4, transparent, outError)) {
// Ending with a layout padding tick
i = width - 2;
while (i > 1) {
(*outRight)++;
i--;
int tick = tick_type(row+i*4, transparent, outError);
if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
break;
}
}
}
return NO_ERROR;
}
static status_t get_vertical_layout_bounds_ticks(
png_bytepp rows, int offset, int height, bool transparent, bool /* required */,
int32_t* outTop, int32_t* outBottom, const char** outError)
{
int i;
*outTop = *outBottom = 0;
// Look for top tick
if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(rows[1] + offset, transparent, outError)) {
// Starting with a layout padding tick
i = 1;
while (i < height - 1) {
(*outTop)++;
i++;
int tick = tick_type(rows[i] + offset, transparent, outError);
if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
break;
}
}
}
// Look for bottom tick
if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(rows[height - 2] + offset, transparent, outError)) {
// Ending with a layout padding tick
i = height - 2;
while (i > 1) {
(*outBottom)++;
i--;
int tick = tick_type(rows[i] + offset, transparent, outError);
if (tick != TICK_TYPE_LAYOUT_BOUNDS) {
break;
}
}
}
return NO_ERROR;
}
static void find_max_opacity(png_byte** rows,
int startX, int startY, int endX, int endY, int dX, int dY,
int* out_inset)
{
uint8_t max_opacity = 0;
int inset = 0;
*out_inset = 0;
for (int x = startX, y = startY; x != endX && y != endY; x += dX, y += dY, inset++) {
png_byte* color = rows[y] + x * 4;
uint8_t opacity = color[3];
if (opacity > max_opacity) {
max_opacity = opacity;
*out_inset = inset;
}
if (opacity == 0xff) return;
}
}
static uint8_t max_alpha_over_row(png_byte* row, int startX, int endX)
{
uint8_t max_alpha = 0;
for (int x = startX; x < endX; x++) {
uint8_t alpha = (row + x * 4)[3];
if (alpha > max_alpha) max_alpha = alpha;
}
return max_alpha;
}
static uint8_t max_alpha_over_col(png_byte** rows, int offsetX, int startY, int endY)
{
uint8_t max_alpha = 0;
for (int y = startY; y < endY; y++) {
uint8_t alpha = (rows[y] + offsetX * 4)[3];
if (alpha > max_alpha) max_alpha = alpha;
}
return max_alpha;
}
static void get_outline(image_info* image)
{
int midX = image->width / 2;
int midY = image->height / 2;
int endX = image->width - 2;
int endY = image->height - 2;
// find left and right extent of nine patch content on center row
if (image->width > 4) {
find_max_opacity(image->rows, 1, midY, midX, -1, 1, 0, &image->outlineInsetsLeft);
find_max_opacity(image->rows, endX, midY, midX, -1, -1, 0, &image->outlineInsetsRight);
} else {
image->outlineInsetsLeft = 0;
image->outlineInsetsRight = 0;
}
// find top and bottom extent of nine patch content on center column
if (image->height > 4) {
find_max_opacity(image->rows, midX, 1, -1, midY, 0, 1, &image->outlineInsetsTop);
find_max_opacity(image->rows, midX, endY, -1, midY, 0, -1, &image->outlineInsetsBottom);
} else {
image->outlineInsetsTop = 0;
image->outlineInsetsBottom = 0;
}
int innerStartX = 1 + image->outlineInsetsLeft;
int innerStartY = 1 + image->outlineInsetsTop;
int innerEndX = endX - image->outlineInsetsRight;
int innerEndY = endY - image->outlineInsetsBottom;
int innerMidX = (innerEndX + innerStartX) / 2;
int innerMidY = (innerEndY + innerStartY) / 2;
// assuming the image is a round rect, compute the radius by marching
// diagonally from the top left corner towards the center
image->outlineAlpha = std::max(
max_alpha_over_row(image->rows[innerMidY], innerStartX, innerEndX),
max_alpha_over_col(image->rows, innerMidX, innerStartY, innerStartY));
int diagonalInset = 0;
find_max_opacity(image->rows, innerStartX, innerStartY, innerMidX, innerMidY, 1, 1,
&diagonalInset);
/* Determine source radius based upon inset:
* sqrt(r^2 + r^2) = sqrt(i^2 + i^2) + r
* sqrt(2) * r = sqrt(2) * i + r
* (sqrt(2) - 1) * r = sqrt(2) * i
* r = sqrt(2) / (sqrt(2) - 1) * i
*/
image->outlineRadius = 3.4142f * diagonalInset;
if (kIsDebug) {
printf("outline insets %d %d %d %d, rad %f, alpha %x\n",
image->outlineInsetsLeft,
image->outlineInsetsTop,
image->outlineInsetsRight,
image->outlineInsetsBottom,
image->outlineRadius,
image->outlineAlpha);
}
}
static uint32_t get_color(
png_bytepp rows, int left, int top, int right, int bottom)
{
png_bytep color = rows[top] + left*4;
if (left > right || top > bottom) {
return Res_png_9patch::TRANSPARENT_COLOR;
}
while (top <= bottom) {
for (int i = left; i <= right; i++) {
png_bytep p = rows[top]+i*4;
if (color[3] == 0) {
if (p[3] != 0) {
return Res_png_9patch::NO_COLOR;
}
} else if (p[0] != color[0] || p[1] != color[1]
|| p[2] != color[2] || p[3] != color[3]) {
return Res_png_9patch::NO_COLOR;
}
}
top++;
}
if (color[3] == 0) {
return Res_png_9patch::TRANSPARENT_COLOR;
}
return (color[3]<<24) | (color[0]<<16) | (color[1]<<8) | color[2];
}
static status_t do_9patch(const char* imageName, image_info* image)
{
image->is9Patch = true;
int W = image->width;
int H = image->height;
int i, j;
int maxSizeXDivs = W * sizeof(int32_t);
int maxSizeYDivs = H * sizeof(int32_t);
int32_t* xDivs = image->xDivs = (int32_t*) malloc(maxSizeXDivs);
int32_t* yDivs = image->yDivs = (int32_t*) malloc(maxSizeYDivs);
uint8_t numXDivs = 0;
uint8_t numYDivs = 0;
int8_t numColors;
int numRows;
int numCols;
int top;
int left;
int right;
int bottom;
memset(xDivs, -1, maxSizeXDivs);
memset(yDivs, -1, maxSizeYDivs);
image->info9Patch.paddingLeft = image->info9Patch.paddingRight =
image->info9Patch.paddingTop = image->info9Patch.paddingBottom = -1;
image->layoutBoundsLeft = image->layoutBoundsRight =
image->layoutBoundsTop = image->layoutBoundsBottom = 0;
png_bytep p = image->rows[0];
bool transparent = p[3] == 0;
bool hasColor = false;
const char* errorMsg = NULL;
int errorPixel = -1;
const char* errorEdge = NULL;
int colorIndex = 0;
// Validate size...
if (W < 3 || H < 3) {
errorMsg = "Image must be at least 3x3 (1x1 without frame) pixels";
goto getout;
}
// Validate frame...
if (!transparent &&
(p[0] != 0xFF || p[1] != 0xFF || p[2] != 0xFF || p[3] != 0xFF)) {
errorMsg = "Must have one-pixel frame that is either transparent or white";
goto getout;
}
// Find left and right of sizing areas...
if (get_horizontal_ticks(p, W, transparent, true, &xDivs[0],
&xDivs[1], &errorMsg, &numXDivs, true) != NO_ERROR) {
errorPixel = xDivs[0];
errorEdge = "top";
goto getout;
}
// Find top and bottom of sizing areas...
if (get_vertical_ticks(image->rows, 0, H, transparent, true, &yDivs[0],
&yDivs[1], &errorMsg, &numYDivs, true) != NO_ERROR) {
errorPixel = yDivs[0];
errorEdge = "left";
goto getout;
}
// Copy patch size data into image...
image->info9Patch.numXDivs = numXDivs;
image->info9Patch.numYDivs = numYDivs;
// Find left and right of padding area...
if (get_horizontal_ticks(image->rows[H-1], W, transparent, false, &image->info9Patch.paddingLeft,
&image->info9Patch.paddingRight, &errorMsg, NULL, false) != NO_ERROR) {
errorPixel = image->info9Patch.paddingLeft;
errorEdge = "bottom";
goto getout;
}
// Find top and bottom of padding area...
if (get_vertical_ticks(image->rows, (W-1)*4, H, transparent, false, &image->info9Patch.paddingTop,
&image->info9Patch.paddingBottom, &errorMsg, NULL, false) != NO_ERROR) {
errorPixel = image->info9Patch.paddingTop;
errorEdge = "right";
goto getout;
}
// Find left and right of layout padding...
get_horizontal_layout_bounds_ticks(image->rows[H-1], W, transparent, false,
&image->layoutBoundsLeft,
&image->layoutBoundsRight, &errorMsg);
get_vertical_layout_bounds_ticks(image->rows, (W-1)*4, H, transparent, false,
&image->layoutBoundsTop,
&image->layoutBoundsBottom, &errorMsg);
image->haveLayoutBounds = image->layoutBoundsLeft != 0
|| image->layoutBoundsRight != 0
|| image->layoutBoundsTop != 0
|| image->layoutBoundsBottom != 0;
if (image->haveLayoutBounds) {
if (kIsDebug) {
printf("layoutBounds=%d %d %d %d\n", image->layoutBoundsLeft, image->layoutBoundsTop,
image->layoutBoundsRight, image->layoutBoundsBottom);
}
}
// use opacity of pixels to estimate the round rect outline
get_outline(image);
// If padding is not yet specified, take values from size.
if (image->info9Patch.paddingLeft < 0) {
image->info9Patch.paddingLeft = xDivs[0];
image->info9Patch.paddingRight = W - 2 - xDivs[1];
} else {
// Adjust value to be correct!
image->info9Patch.paddingRight = W - 2 - image->info9Patch.paddingRight;
}
if (image->info9Patch.paddingTop < 0) {
image->info9Patch.paddingTop = yDivs[0];
image->info9Patch.paddingBottom = H - 2 - yDivs[1];
} else {
// Adjust value to be correct!
image->info9Patch.paddingBottom = H - 2 - image->info9Patch.paddingBottom;
}
if (kIsDebug) {
printf("Size ticks for %s: x0=%d, x1=%d, y0=%d, y1=%d\n", imageName,
xDivs[0], xDivs[1],
yDivs[0], yDivs[1]);
printf("padding ticks for %s: l=%d, r=%d, t=%d, b=%d\n", imageName,
image->info9Patch.paddingLeft, image->info9Patch.paddingRight,
image->info9Patch.paddingTop, image->info9Patch.paddingBottom);
}
// Remove frame from image.
image->rows = (png_bytepp)malloc((H-2) * sizeof(png_bytep));
for (i=0; i<(H-2); i++) {
image->rows[i] = image->allocRows[i+1];
memmove(image->rows[i], image->rows[i]+4, (W-2)*4);
}
image->width -= 2;
W = image->width;
image->height -= 2;
H = image->height;
// Figure out the number of rows and columns in the N-patch
numCols = numXDivs + 1;
if (xDivs[0] == 0) { // Column 1 is strechable
numCols--;
}
if (xDivs[numXDivs - 1] == W) {
numCols--;
}
numRows = numYDivs + 1;
if (yDivs[0] == 0) { // Row 1 is strechable
numRows--;
}
if (yDivs[numYDivs - 1] == H) {
numRows--;
}
// Make sure the amount of rows and columns will fit in the number of
// colors we can use in the 9-patch format.
if (numRows * numCols > 0x7F) {
errorMsg = "Too many rows and columns in 9-patch perimeter";
goto getout;
}
numColors = numRows * numCols;
image->info9Patch.numColors = numColors;
image->colors = (uint32_t*)malloc(numColors * sizeof(uint32_t));
// Fill in color information for each patch.
uint32_t c;
top = 0;
// The first row always starts with the top being at y=0 and the bottom
// being either yDivs[1] (if yDivs[0]=0) of yDivs[0]. In the former case
// the first row is stretchable along the Y axis, otherwise it is fixed.
// The last row always ends with the bottom being bitmap.height and the top
// being either yDivs[numYDivs-2] (if yDivs[numYDivs-1]=bitmap.height) or
// yDivs[numYDivs-1]. In the former case the last row is stretchable along
// the Y axis, otherwise it is fixed.
//
// The first and last columns are similarly treated with respect to the X
// axis.
//
// The above is to help explain some of the special casing that goes on the
// code below.
// The initial yDiv and whether the first row is considered stretchable or
// not depends on whether yDiv[0] was zero or not.
for (j = (yDivs[0] == 0 ? 1 : 0);
j <= numYDivs && top < H;
j++) {
if (j == numYDivs) {
bottom = H;
} else {
bottom = yDivs[j];
}
left = 0;
// The initial xDiv and whether the first column is considered
// stretchable or not depends on whether xDiv[0] was zero or not.
for (i = xDivs[0] == 0 ? 1 : 0;
i <= numXDivs && left < W;
i++) {
if (i == numXDivs) {
right = W;
} else {
right = xDivs[i];
}
c = get_color(image->rows, left, top, right - 1, bottom - 1);
image->colors[colorIndex++] = c;
if (kIsDebug) {
if (c != Res_png_9patch::NO_COLOR)
hasColor = true;
}
left = right;
}
top = bottom;
}
assert(colorIndex == numColors);
for (i=0; i<numColors; i++) {
if (hasColor) {
if (i == 0) printf("Colors in %s:\n ", imageName);
printf(" #%08x", image->colors[i]);
if (i == numColors - 1) printf("\n");
}
}
getout:
if (errorMsg) {
fprintf(stderr,
"ERROR: 9-patch image %s malformed.\n"
" %s.\n", imageName, errorMsg);
if (errorEdge != NULL) {
if (errorPixel >= 0) {
fprintf(stderr,
" Found at pixel #%d along %s edge.\n", errorPixel, errorEdge);
} else {
fprintf(stderr,
" Found along %s edge.\n", errorEdge);
}
}
return UNKNOWN_ERROR;
}
return NO_ERROR;
}
static void checkNinePatchSerialization(Res_png_9patch* inPatch, void* data)
{
size_t patchSize = inPatch->serializedSize();
void* newData = malloc(patchSize);
memcpy(newData, data, patchSize);
Res_png_9patch* outPatch = inPatch->deserialize(newData);
// deserialization is done in place, so outPatch == newData
assert(outPatch == newData);
assert(outPatch->numXDivs == inPatch->numXDivs);
assert(outPatch->numYDivs == inPatch->numYDivs);
assert(outPatch->paddingLeft == inPatch->paddingLeft);
assert(outPatch->paddingRight == inPatch->paddingRight);
assert(outPatch->paddingTop == inPatch->paddingTop);
assert(outPatch->paddingBottom == inPatch->paddingBottom);
for (int i = 0; i < outPatch->numXDivs; i++) {
assert(outPatch->getXDivs()[i] == inPatch->getXDivs()[i]);
}
for (int i = 0; i < outPatch->numYDivs; i++) {
assert(outPatch->getYDivs()[i] == inPatch->getYDivs()[i]);
}
for (int i = 0; i < outPatch->numColors; i++) {
assert(outPatch->getColors()[i] == inPatch->getColors()[i]);
}
free(newData);
}
static void dump_image(int w, int h, png_bytepp rows, int color_type)
{
int i, j, rr, gg, bb, aa;
int bpp;
if (color_type == PNG_COLOR_TYPE_PALETTE || color_type == PNG_COLOR_TYPE_GRAY) {
bpp = 1;
} else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
bpp = 2;
} else if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
// We use a padding byte even when there is no alpha
bpp = 4;
} else {
printf("Unknown color type %d.\n", color_type);
}
for (j = 0; j < h; j++) {
png_bytep row = rows[j];
for (i = 0; i < w; i++) {
rr = row[0];
gg = row[1];
bb = row[2];
aa = row[3];
row += bpp;
if (i == 0) {
printf("Row %d:", j);
}
switch (bpp) {
case 1:
printf(" (%d)", rr);
break;
case 2:
printf(" (%d %d", rr, gg);
break;
case 3:
printf(" (%d %d %d)", rr, gg, bb);
break;
case 4:
printf(" (%d %d %d %d)", rr, gg, bb, aa);
break;
}
if (i == (w - 1)) {
printf("\n");
}
}
}
}
#define MAX(a,b) ((a)>(b)?(a):(b))
#define ABS(a) ((a)<0?-(a):(a))
static void analyze_image(const char *imageName, image_info &imageInfo, int grayscaleTolerance,
png_colorp rgbPalette, png_bytep alphaPalette,
int *paletteEntries, int *alphaPaletteEntries, bool *hasTransparency,
int *colorType, png_bytepp outRows)
{
int w = imageInfo.width;
int h = imageInfo.height;
int i, j, rr, gg, bb, aa, idx;;
uint32_t opaqueColors[256], alphaColors[256];
uint32_t col;
int numOpaqueColors = 0, numAlphaColors = 0;
int maxGrayDeviation = 0;
bool isOpaque = true;
bool isPalette = true;
bool isGrayscale = true;
// Scan the entire image and determine if:
// 1. Every pixel has R == G == B (grayscale)
// 2. Every pixel has A == 255 (opaque)
// 3. There are no more than 256 distinct RGBA colors
// We will track opaque colors separately from colors with
// alpha. This allows us to reencode the color table more
// efficiently (color tables entries without a corresponding
// alpha value are assumed to be opaque).
if (kIsDebug) {
printf("Initial image data:\n");
dump_image(w, h, imageInfo.rows, PNG_COLOR_TYPE_RGB_ALPHA);
}
for (j = 0; j < h; j++) {
png_bytep row = imageInfo.rows[j];
png_bytep out = outRows[j];
for (i = 0; i < w; i++) {
// Make sure any zero alpha pixels are fully zeroed. On average,
// each of our PNG assets seem to have about four distinct pixels
// with zero alpha.
// There are several advantages to setting these to zero:
// (1) Images are more likely able to be encodable with a palette.
// (2) Image palettes will be smaller.
// (3) Premultiplied and unpremultiplied PNG decodes can skip
// writing zeros to memory, often saving significant numbers
// of memory pages.
aa = *(row + 3);
if (aa == 0) {
rr = 0;
gg = 0;
bb = 0;
// Also set red, green, and blue to zero in "row". If we later
// decide to encode the PNG as RGB or RGBA, we will use the
// values stored there.
*(row) = 0;
*(row + 1) = 0;
*(row + 2) = 0;
} else {
rr = *(row);
gg = *(row + 1);
bb = *(row + 2);
}
row += 4;
int odev = maxGrayDeviation;
maxGrayDeviation = MAX(ABS(rr - gg), maxGrayDeviation);
maxGrayDeviation = MAX(ABS(gg - bb), maxGrayDeviation);
maxGrayDeviation = MAX(ABS(bb - rr), maxGrayDeviation);
if (maxGrayDeviation > odev) {
if (kIsDebug) {
printf("New max dev. = %d at pixel (%d, %d) = (%d %d %d %d)\n",
maxGrayDeviation, i, j, rr, gg, bb, aa);
}
}
// Check if image is really grayscale
if (isGrayscale) {
if (rr != gg || rr != bb) {
if (kIsDebug) {
printf("Found a non-gray pixel at %d, %d = (%d %d %d %d)\n",
i, j, rr, gg, bb, aa);
}
isGrayscale = false;
}
}
// Check if image is really opaque
if (isOpaque) {
if (aa != 0xff) {
if (kIsDebug) {
printf("Found a non-opaque pixel at %d, %d = (%d %d %d %d)\n",
i, j, rr, gg, bb, aa);
}
isOpaque = false;
}
}
// Check if image is really <= 256 colors
if (isPalette) {
col = (uint32_t) ((rr << 24) | (gg << 16) | (bb << 8) | aa);
bool match = false;
if (aa == 0xff) {
for (idx = 0; idx < numOpaqueColors; idx++) {
if (opaqueColors[idx] == col) {
match = true;
break;
}
}
if (!match) {
if (numOpaqueColors < 256) {
opaqueColors[numOpaqueColors] = col;
}
numOpaqueColors++;
}
// Write the palette index for the pixel to outRows optimistically.
// We might overwrite it later if we decide to encode as gray or
// gray + alpha. We may also need to overwrite it when we combine
// into a single palette.
*out++ = idx;
} else {
for (idx = 0; idx < numAlphaColors; idx++) {
if (alphaColors[idx] == col) {
match = true;
break;