1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
2 /* GdkPixbuf library - PNG image loader
4 * Copyright (C) 1999 Mark Crichton
5 * Copyright (C) 1999 The Free Software Foundation
7 * Authors: Mark Crichton <crichton@gimp.org>
8 * Federico Mena-Quintero <federico@gimp.org>
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this library; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 02111-1307, USA.
30 #include "gdk-pixbuf-private.h"
31 #include "gdk-pixbuf-io.h"
36 setup_png_transformations(png_structp png_read_ptr, png_infop png_info_ptr,
38 png_uint_32* width_p, png_uint_32* height_p,
41 png_uint_32 width, height;
42 int bit_depth, color_type, interlace_type, compression_type, filter_type;
45 /* Get the image info */
47 /* Must check bit depth, since png_get_IHDR generates an
50 bit_depth = png_get_bit_depth (png_read_ptr, png_info_ptr);
51 if (bit_depth < 1 || bit_depth > 16) {
52 g_set_error_literal (error,
54 GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
55 _("Bits per channel of PNG image is invalid."));
58 png_get_IHDR (png_read_ptr, png_info_ptr,
66 /* set_expand() basically needs to be called unless
67 we are already in RGB/RGBA mode
69 if (color_type == PNG_COLOR_TYPE_PALETTE &&
72 /* Convert indexed images to RGB */
73 png_set_expand (png_read_ptr);
75 } else if (color_type == PNG_COLOR_TYPE_GRAY &&
78 /* Convert grayscale to RGB */
79 png_set_expand (png_read_ptr);
81 } else if (png_get_valid (png_read_ptr,
82 png_info_ptr, PNG_INFO_tRNS)) {
84 /* If we have transparency header, convert it to alpha
86 png_set_expand(png_read_ptr);
88 } else if (bit_depth < 8) {
90 /* If we have < 8 scale it up to 8 */
91 png_set_expand(png_read_ptr);
94 /* Conceivably, png_set_packing() is a better idea;
95 * God only knows how libpng works
99 /* If we are 16-bit, convert to 8-bit */
100 if (bit_depth == 16) {
101 png_set_strip_16(png_read_ptr);
104 /* If gray scale, convert to RGB */
105 if (color_type == PNG_COLOR_TYPE_GRAY ||
106 color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
107 png_set_gray_to_rgb(png_read_ptr);
110 /* If interlaced, handle that */
111 if (interlace_type != PNG_INTERLACE_NONE) {
112 png_set_interlace_handling(png_read_ptr);
115 /* Update the info the reflect our transformations */
116 png_read_update_info(png_read_ptr, png_info_ptr);
118 png_get_IHDR (png_read_ptr, png_info_ptr,
128 *color_type_p = color_type;
130 /* Check that the new info is what we want */
132 if (width == 0 || height == 0) {
133 g_set_error_literal (error,
135 GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
136 _("Transformed PNG has zero width or height."));
140 if (bit_depth != 8) {
141 g_set_error_literal (error,
143 GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
144 _("Bits per channel of transformed PNG is not 8."));
148 if ( ! (color_type == PNG_COLOR_TYPE_RGB ||
149 color_type == PNG_COLOR_TYPE_RGB_ALPHA) ) {
150 g_set_error_literal (error,
152 GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
153 _("Transformed PNG not RGB or RGBA."));
157 channels = png_get_channels(png_read_ptr, png_info_ptr);
158 if ( ! (channels == 3 || channels == 4) ) {
159 g_set_error_literal (error,
161 GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
162 _("Transformed PNG has unsupported number of channels, must be 3 or 4."));
169 png_simple_error_callback(png_structp png_save_ptr,
170 png_const_charp error_msg)
174 error = png_get_error_ptr(png_save_ptr);
176 /* I don't trust libpng to call the error callback only once,
177 * so check for already-set error
179 if (error && *error == NULL) {
182 GDK_PIXBUF_ERROR_FAILED,
183 _("Fatal error in PNG image file: %s"),
187 longjmp (png_save_ptr->jmpbuf, 1);
191 png_simple_warning_callback(png_structp png_save_ptr,
192 png_const_charp warning_msg)
194 /* Don't print anything; we should not be dumping junk to
195 * stderr, since that may be bad for some apps. If it's
196 * important enough to display, we need to add a GError
197 * **warning return location wherever we have an error return
203 png_text_to_pixbuf_option (png_text text_ptr,
207 gboolean is_ascii = TRUE;
210 /* Avoid loading iconv if the text is plain ASCII */
211 for (i = 0; i < text_ptr.text_length; i++)
212 if (text_ptr.text[i] & 0x80) {
218 *value = g_strdup (text_ptr.text);
220 *value = g_convert (text_ptr.text, -1,
221 "UTF-8", "ISO-8859-1",
226 *key = g_strconcat ("tEXt::", text_ptr.key, NULL);
229 g_warning ("Couldn't convert text chunk value to UTF-8.");
236 png_malloc_callback (png_structp o, png_size_t size)
238 return g_try_malloc (size);
242 png_free_callback (png_structp o, png_voidp x)
247 /* Shared library entry point */
249 gdk_pixbuf__png_image_load (FILE *f, GError **error)
251 GdkPixbuf * volatile pixbuf = NULL;
257 png_bytepp volatile rows = NULL;
262 #ifdef PNG_USER_MEM_SUPPORTED
263 png_ptr = png_create_read_struct_2 (PNG_LIBPNG_VER_STRING,
265 png_simple_error_callback,
266 png_simple_warning_callback,
271 png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING,
273 png_simple_error_callback,
274 png_simple_warning_callback);
279 info_ptr = png_create_info_struct (png_ptr);
281 png_destroy_read_struct (&png_ptr, NULL, NULL);
285 if (setjmp (png_ptr->jmpbuf)) {
289 g_object_unref (pixbuf);
291 png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
295 png_init_io (png_ptr, f);
296 png_read_info (png_ptr, info_ptr);
298 if (!setup_png_transformations(png_ptr, info_ptr, error, &w, &h, &ctype)) {
299 png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
303 pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, ctype & PNG_COLOR_MASK_ALPHA, 8, w, h);
306 if (error && *error == NULL) {
307 g_set_error_literal (error,
309 GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
310 _("Insufficient memory to load PNG file"));
314 png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
318 rows = g_new (png_bytep, h);
320 for (i = 0; i < h; i++)
321 rows[i] = pixbuf->pixels + i * pixbuf->rowstride;
323 png_read_image (png_ptr, rows);
324 png_read_end (png_ptr, info_ptr);
326 if (png_get_text (png_ptr, info_ptr, &text_ptr, &num_texts)) {
327 for (i = 0; i < num_texts; i++) {
328 png_text_to_pixbuf_option (text_ptr[i], &key, &value);
329 gdk_pixbuf_set_option (pixbuf, key, value);
336 png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
341 /* I wish these avoided the setjmp()/longjmp() crap in libpng instead
342 just allow you to change the error reporting. */
343 static void png_error_callback (png_structp png_read_ptr,
344 png_const_charp error_msg);
346 static void png_warning_callback (png_structp png_read_ptr,
347 png_const_charp warning_msg);
349 /* Called at the start of the progressive load */
350 static void png_info_callback (png_structp png_read_ptr,
351 png_infop png_info_ptr);
353 /* Called for each row; note that you will get duplicate row numbers
354 for interlaced PNGs */
355 static void png_row_callback (png_structp png_read_ptr,
360 /* Called after reading the entire image */
361 static void png_end_callback (png_structp png_read_ptr,
362 png_infop png_info_ptr);
364 typedef struct _LoadContext LoadContext;
366 struct _LoadContext {
367 png_structp png_read_ptr;
368 png_infop png_info_ptr;
370 GdkPixbufModuleSizeFunc size_func;
371 GdkPixbufModulePreparedFunc prepare_func;
372 GdkPixbufModuleUpdatedFunc update_func;
373 gpointer notify_user_data;
377 /* row number of first row seen, or -1 if none yet seen */
379 gint first_row_seen_in_chunk;
381 /* pass number for the first row seen */
383 gint first_pass_seen_in_chunk;
385 /* row number of last row seen */
386 gint last_row_seen_in_chunk;
388 gint last_pass_seen_in_chunk;
390 /* highest row number seen */
391 gint max_row_seen_in_chunk;
393 guint fatal_error_occurred : 1;
399 gdk_pixbuf__png_image_begin_load (GdkPixbufModuleSizeFunc size_func,
400 GdkPixbufModulePreparedFunc prepare_func,
401 GdkPixbufModuleUpdatedFunc update_func,
407 lc = g_new0(LoadContext, 1);
409 lc->fatal_error_occurred = FALSE;
411 lc->size_func = size_func;
412 lc->prepare_func = prepare_func;
413 lc->update_func = update_func;
414 lc->notify_user_data = user_data;
416 lc->first_row_seen_in_chunk = -1;
417 lc->last_row_seen_in_chunk = -1;
418 lc->first_pass_seen_in_chunk = -1;
419 lc->last_pass_seen_in_chunk = -1;
420 lc->max_row_seen_in_chunk = -1;
423 /* Create the main PNG context struct */
425 #ifdef PNG_USER_MEM_SUPPORTED
426 lc->png_read_ptr = png_create_read_struct_2 (PNG_LIBPNG_VER_STRING,
427 lc, /* error/warning callback data */
429 png_warning_callback,
434 lc->png_read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
435 lc, /* error/warning callback data */
437 png_warning_callback);
439 if (lc->png_read_ptr == NULL) {
441 /* error callback should have set the error */
445 if (setjmp (lc->png_read_ptr->jmpbuf)) {
446 if (lc->png_info_ptr)
447 png_destroy_read_struct(&lc->png_read_ptr, NULL, NULL);
449 /* error callback should have set the error */
453 /* Create the auxiliary context struct */
455 lc->png_info_ptr = png_create_info_struct(lc->png_read_ptr);
457 if (lc->png_info_ptr == NULL) {
458 png_destroy_read_struct(&lc->png_read_ptr, NULL, NULL);
460 /* error callback should have set the error */
464 png_set_progressive_read_fn(lc->png_read_ptr,
465 lc, /* callback data */
471 /* We don't want to keep modifying error after returning here,
472 * it may no longer be valid.
480 gdk_pixbuf__png_image_stop_load (gpointer context, GError **error)
482 LoadContext* lc = context;
484 g_return_val_if_fail(lc != NULL, TRUE);
486 /* FIXME this thing needs to report errors if
487 * we have unused image data
491 g_object_unref (lc->pixbuf);
493 png_destroy_read_struct(&lc->png_read_ptr, &lc->png_info_ptr, NULL);
500 gdk_pixbuf__png_image_load_increment(gpointer context,
501 const guchar *buf, guint size,
504 LoadContext* lc = context;
506 g_return_val_if_fail(lc != NULL, FALSE);
509 lc->first_row_seen_in_chunk = -1;
510 lc->last_row_seen_in_chunk = -1;
511 lc->first_pass_seen_in_chunk = -1;
512 lc->last_pass_seen_in_chunk = -1;
513 lc->max_row_seen_in_chunk = -1;
516 /* Invokes our callbacks as needed */
517 if (setjmp (lc->png_read_ptr->jmpbuf)) {
521 png_process_data(lc->png_read_ptr, lc->png_info_ptr,
522 (guchar*) buf, size);
525 if (lc->fatal_error_occurred) {
529 if (lc->first_row_seen_in_chunk >= 0 && lc->update_func) {
530 /* We saw at least one row */
531 gint pass_diff = lc->last_pass_seen_in_chunk - lc->first_pass_seen_in_chunk;
533 g_assert(pass_diff >= 0);
535 if (pass_diff == 0) {
536 /* start and end row were in the same pass */
537 (lc->update_func)(lc->pixbuf, 0,
538 lc->first_row_seen_in_chunk,
540 (lc->last_row_seen_in_chunk -
541 lc->first_row_seen_in_chunk) + 1,
542 lc->notify_user_data);
543 } else if (pass_diff == 1) {
544 /* We have from the first row seen to
545 the end of the image (max row
546 seen), then from the top of the
547 image to the last row seen */
548 /* first row to end */
549 (lc->update_func)(lc->pixbuf, 0,
550 lc->first_row_seen_in_chunk,
552 (lc->max_row_seen_in_chunk -
553 lc->first_row_seen_in_chunk) + 1,
554 lc->notify_user_data);
555 /* top to last row */
556 (lc->update_func)(lc->pixbuf,
559 lc->last_row_seen_in_chunk + 1,
560 lc->notify_user_data);
562 /* We made at least one entire pass, so update the
564 (lc->update_func)(lc->pixbuf,
567 lc->max_row_seen_in_chunk + 1,
568 lc->notify_user_data);
578 /* Called at the start of the progressive load, once we have image info */
580 png_info_callback (png_structp png_read_ptr,
581 png_infop png_info_ptr)
584 png_uint_32 width, height;
585 png_textp png_text_ptr;
588 gboolean have_alpha = FALSE;
590 lc = png_get_progressive_ptr(png_read_ptr);
592 if (lc->fatal_error_occurred)
595 if (!setup_png_transformations(lc->png_read_ptr,
598 &width, &height, &color_type)) {
599 lc->fatal_error_occurred = TRUE;
603 /* If we have alpha, set a flag */
604 if (color_type & PNG_COLOR_MASK_ALPHA)
610 (* lc->size_func) (&w, &h, lc->notify_user_data);
612 if (w == 0 || h == 0) {
613 lc->fatal_error_occurred = TRUE;
614 if (lc->error && *lc->error == NULL) {
615 g_set_error_literal (lc->error,
617 GDK_PIXBUF_ERROR_FAILED,
618 _("Transformed PNG has zero width or height."));
624 lc->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, have_alpha, 8, width, height);
626 if (lc->pixbuf == NULL) {
627 /* Failed to allocate memory */
628 lc->fatal_error_occurred = TRUE;
629 if (lc->error && *lc->error == NULL) {
630 g_set_error (lc->error,
632 GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
633 _("Insufficient memory to store a %ld by %ld image; try exiting some applications to reduce memory usage"),
639 /* Extract text chunks and attach them as pixbuf options */
641 if (png_get_text (png_read_ptr, png_info_ptr, &png_text_ptr, &num_texts)) {
642 for (i = 0; i < num_texts; i++) {
645 if (png_text_to_pixbuf_option (png_text_ptr[i],
647 gdk_pixbuf_set_option (lc->pixbuf, key, value);
654 /* Notify the client that we are ready to go */
656 if (lc->prepare_func)
657 (* lc->prepare_func) (lc->pixbuf, NULL, lc->notify_user_data);
662 /* Called for each row; note that you will get duplicate row numbers
663 for interlaced PNGs */
665 png_row_callback (png_structp png_read_ptr,
671 guchar* old_row = NULL;
673 lc = png_get_progressive_ptr(png_read_ptr);
675 if (lc->fatal_error_occurred)
678 if (row_num >= lc->pixbuf->height) {
679 lc->fatal_error_occurred = TRUE;
680 if (lc->error && *lc->error == NULL) {
681 g_set_error_literal (lc->error,
683 GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
684 _("Fatal error reading PNG image file"));
689 if (lc->first_row_seen_in_chunk < 0) {
690 lc->first_row_seen_in_chunk = row_num;
691 lc->first_pass_seen_in_chunk = pass_num;
694 lc->max_row_seen_in_chunk = MAX(lc->max_row_seen_in_chunk, ((gint)row_num));
695 lc->last_row_seen_in_chunk = row_num;
696 lc->last_pass_seen_in_chunk = pass_num;
698 old_row = lc->pixbuf->pixels + (row_num * lc->pixbuf->rowstride);
700 png_progressive_combine_row(lc->png_read_ptr, old_row, new_row);
703 /* Called after reading the entire image */
705 png_end_callback (png_structp png_read_ptr,
706 png_infop png_info_ptr)
710 lc = png_get_progressive_ptr(png_read_ptr);
712 if (lc->fatal_error_occurred)
717 png_error_callback(png_structp png_read_ptr,
718 png_const_charp error_msg)
722 lc = png_get_error_ptr(png_read_ptr);
724 lc->fatal_error_occurred = TRUE;
726 /* I don't trust libpng to call the error callback only once,
727 * so check for already-set error
729 if (lc->error && *lc->error == NULL) {
730 g_set_error (lc->error,
732 GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
733 _("Fatal error reading PNG image file: %s"),
737 longjmp (png_read_ptr->jmpbuf, 1);
741 png_warning_callback (png_structp png_read_ptr,
742 png_const_charp warning_msg)
746 lc = png_get_error_ptr(png_read_ptr);
748 /* Don't print anything; we should not be dumping junk to
749 * stderr, since that may be bad for some apps. If it's
750 * important enough to display, we need to add a GError
751 * **warning return location wherever we have an error return
760 GdkPixbufSaveFunc save_func;
763 } SaveToFunctionIoPtr;
766 png_save_to_callback_write_func (png_structp png_ptr,
770 SaveToFunctionIoPtr *ioptr = png_get_io_ptr (png_ptr);
772 if (!ioptr->save_func ((gchar *)data, length, ioptr->error, ioptr->user_data)) {
773 /* If save_func has already set an error, which it
774 should have done, this won't overwrite it. */
775 png_error (png_ptr, "write function failed");
780 png_save_to_callback_flush_func (png_structp png_ptr)
785 static gboolean real_save_png (GdkPixbuf *pixbuf,
789 gboolean to_callback,
791 GdkPixbufSaveFunc save_func,
796 png_textp text_ptr = NULL;
807 int compression = -1;
808 gboolean success = TRUE;
809 SaveToFunctionIoPtr to_callback_ioptr;
814 gchar **kiter = keys;
815 gchar **viter = values;
818 if (strncmp (*kiter, "tEXt::", 6) == 0) {
819 gchar *key = *kiter + 6;
820 int len = strlen (key);
821 if (len <= 1 || len > 79) {
822 g_set_error_literal (error,
824 GDK_PIXBUF_ERROR_BAD_OPTION,
825 _("Keys for PNG text chunks must have at least 1 and at most 79 characters."));
828 for (i = 0; i < len; i++) {
829 if ((guchar) key[i] > 127) {
830 g_set_error_literal (error,
832 GDK_PIXBUF_ERROR_BAD_OPTION,
833 _("Keys for PNG text chunks must be ASCII characters."));
838 } else if (strcmp (*kiter, "compression") == 0) {
840 compression = strtol (*viter, &endptr, 10);
842 if (endptr == *viter) {
845 GDK_PIXBUF_ERROR_BAD_OPTION,
846 _("PNG compression level must be a value between 0 and 9; value '%s' could not be parsed."),
850 if (compression < 0 || compression > 9) {
851 /* This is a user-visible error;
852 * lets people skip the range-checking
857 GDK_PIXBUF_ERROR_BAD_OPTION,
858 _("PNG compression level must be a value between 0 and 9; value '%d' is not allowed."),
863 g_warning ("Unrecognized parameter (%s) passed to PNG saver.", *kiter);
872 text_ptr = g_new0 (png_text, num_keys);
873 for (i = 0; i < num_keys; i++) {
874 text_ptr[i].compression = PNG_TEXT_COMPRESSION_NONE;
875 text_ptr[i].key = keys[i] + 6;
876 text_ptr[i].text = g_convert (values[i], -1,
877 "ISO-8859-1", "UTF-8",
878 NULL, &text_ptr[i].text_length,
881 #ifdef PNG_iTXt_SUPPORTED
882 if (!text_ptr[i].text) {
883 text_ptr[i].compression = PNG_ITXT_COMPRESSION_NONE;
884 text_ptr[i].text = g_strdup (values[i]);
885 text_ptr[i].text_length = 0;
886 text_ptr[i].itxt_length = strlen (text_ptr[i].text);
887 text_ptr[i].lang = NULL;
888 text_ptr[i].lang_key = NULL;
892 if (!text_ptr[i].text) {
895 GDK_PIXBUF_ERROR_BAD_OPTION,
896 _("Value for PNG text chunk %s cannot be converted to ISO-8859-1 encoding."), keys[i] + 6);
898 for (i = 0; i < num_keys; i++)
899 g_free (text_ptr[i].text);
906 bpc = gdk_pixbuf_get_bits_per_sample (pixbuf);
907 w = gdk_pixbuf_get_width (pixbuf);
908 h = gdk_pixbuf_get_height (pixbuf);
909 rowstride = gdk_pixbuf_get_rowstride (pixbuf);
910 has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
911 pixels = gdk_pixbuf_get_pixels (pixbuf);
913 png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
915 png_simple_error_callback,
916 png_simple_warning_callback);
917 if (png_ptr == NULL) {
922 info_ptr = png_create_info_struct (png_ptr);
923 if (info_ptr == NULL) {
927 if (setjmp (png_ptr->jmpbuf)) {
933 png_set_text (png_ptr, info_ptr, text_ptr, num_keys);
937 to_callback_ioptr.save_func = save_func;
938 to_callback_ioptr.user_data = user_data;
939 to_callback_ioptr.error = error;
940 png_set_write_fn (png_ptr, &to_callback_ioptr,
941 png_save_to_callback_write_func,
942 png_save_to_callback_flush_func);
944 png_init_io (png_ptr, f);
947 if (compression >= 0)
948 png_set_compression_level (png_ptr, compression);
951 png_set_IHDR (png_ptr, info_ptr, w, h, bpc,
952 PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
953 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
955 png_set_IHDR (png_ptr, info_ptr, w, h, bpc,
956 PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
957 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
963 png_set_sBIT (png_ptr, info_ptr, &sig_bit);
964 png_write_info (png_ptr, info_ptr);
965 png_set_shift (png_ptr, &sig_bit);
966 png_set_packing (png_ptr);
969 for (y = 0; y < h; y++) {
970 row_ptr = (png_bytep)ptr;
971 png_write_rows (png_ptr, &row_ptr, 1);
975 png_write_end (png_ptr, info_ptr);
978 png_destroy_write_struct (&png_ptr, &info_ptr);
981 for (i = 0; i < num_keys; i++)
982 g_free (text_ptr[i].text);
990 gdk_pixbuf__png_image_save (FILE *f,
996 return real_save_png (pixbuf, keys, values, error,
997 FALSE, f, NULL, NULL);
1001 gdk_pixbuf__png_image_save_to_callback (GdkPixbufSaveFunc save_func,
1008 return real_save_png (pixbuf, keys, values, error,
1009 TRUE, NULL, save_func, user_data);
1013 #define MODULE_ENTRY(function) G_MODULE_EXPORT void function
1015 #define MODULE_ENTRY(function) void _gdk_pixbuf__png_ ## function
1018 MODULE_ENTRY (fill_vtable) (GdkPixbufModule *module)
1020 module->load = gdk_pixbuf__png_image_load;
1021 module->begin_load = gdk_pixbuf__png_image_begin_load;
1022 module->stop_load = gdk_pixbuf__png_image_stop_load;
1023 module->load_increment = gdk_pixbuf__png_image_load_increment;
1024 module->save = gdk_pixbuf__png_image_save;
1025 module->save_to_callback = gdk_pixbuf__png_image_save_to_callback;
1028 MODULE_ENTRY (fill_info) (GdkPixbufFormat *info)
1030 static GdkPixbufModulePattern signature[] = {
1031 { "\x89PNG\r\n\x1a\x0a", NULL, 100 },
1034 static gchar * mime_types[] = {
1038 static gchar * extensions[] = {
1044 info->signature = signature;
1045 info->description = N_("The PNG image format");
1046 info->mime_types = mime_types;
1047 info->extensions = extensions;
1048 info->flags = GDK_PIXBUF_FORMAT_WRITABLE | GDK_PIXBUF_FORMAT_THREADSAFE;
1049 info->license = "LGPL";