Images.cpp revision ec4a50428d5f26a22df3edaf7e5b08f41d5cb54b 
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
18static void
19png_write_aapt_file(png_structp png_ptr, png_bytep data, png_size_t length)
20{
21    status_t err = ((AaptFile*)png_ptr->io_ptr)->writeData(data, length);
22    if (err != NO_ERROR) {
23        png_error(png_ptr, "Write Error");
24    }
25}
26
27
28static void
29png_flush_aapt_file(png_structp png_ptr)
30{
31}
32
33// This holds an image as 8bpp RGBA.
34struct image_info
35{
36    image_info() : rows(NULL), 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
71static 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
144enum {
145    TICK_TYPE_NONE,
146    TICK_TYPE_TICK,
147    TICK_TYPE_LAYOUT_BOUNDS,
148    TICK_TYPE_BOTH
149};
150
151static 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
197enum {
198    TICK_START,
199    TICK_INSIDE_1,
200    TICK_OUTSIDE_1
201};
202
203static 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
252static 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
301static 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
339static 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
378static 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
408static 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
427static 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
443static 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
674getout:
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
693static 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
723static 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
751static 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
803static 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
973static 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
1123status_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
1225bail:
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
1243status_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
1370status_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}
1383