2
/* png.c - location for general purpose libpng functions
4
* libpng version 1.2.8 - December 3, 2004
5
* For conditions of distribution and use, see copyright notice in png.h
6
* Copyright (c) 1998-2004 Glenn Randers-Pehrson
7
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
15
/* Generate a compiler error if there is an old png.h in the search path. */
16
typedef version_1_2_8 Your_png_h_is_not_version_1_2_8;
18
/* Version information for C files. This had better match the version
19
* string defined in png.h. */
21
#ifdef PNG_USE_GLOBAL_ARRAYS
22
/* png_libpng_ver was changed to a function in version 1.0.5c */
23
const char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
25
/* png_sig was changed to a function in version 1.0.5c */
26
/* Place to hold the signature string for a PNG file. */
27
const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
29
/* Invoke global declarations for constant strings for known chunk types */
52
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
54
/* start of interlace block */
55
const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
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/* offset to next interlace block */
58
const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
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/* start of interlace block in the y direction */
61
const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
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/* offset to next interlace block in the y direction */
64
const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
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/* width of interlace block (used in assembler routines only) */
67
#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
68
const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
71
/* Height of interlace block. This is not currently used - if you need
72
* it, uncomment it here and in png.h
73
const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
76
/* Mask to determine which pixels are valid in a pass */
77
const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
79
/* Mask to determine which pixels to overwrite while displaying */
80
const int FARDATA png_pass_dsp_mask[]
81
= {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
83
#endif /* PNG_USE_GLOBAL_ARRAYS */
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/* Tells libpng that we have already handled the first "num_bytes" bytes
86
* of the PNG file signature. If the PNG data is embedded into another
87
* stream we can set num_bytes = 8 so that libpng will not attempt to read
88
* or write any of the magic bytes before it starts on the IHDR.
92
png_set_sig_bytes(png_structp png_ptr, int num_bytes)
94
png_debug(1, "in png_set_sig_bytes\n");
96
png_error(png_ptr, "Too many bytes for PNG signature.");
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png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
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/* Checks whether the supplied bytes match the PNG signature. We allow
102
* checking less than the full 8-byte signature so that those apps that
103
* already read the first few bytes of a file to determine the file type
104
* can simply check the remaining bytes for extra assurance. Returns
105
* an integer less than, equal to, or greater than zero if sig is found,
106
* respectively, to be less than, to match, or be greater than the correct
107
* PNG signature (this is the same behaviour as strcmp, memcmp, etc).
110
png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
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png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
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if (num_to_check > 8)
115
else if (num_to_check < 1)
121
if (start + num_to_check > 8)
122
num_to_check = 8 - start;
124
return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
127
/* (Obsolete) function to check signature bytes. It does not allow one
128
* to check a partial signature. This function might be removed in the
129
* future - use png_sig_cmp(). Returns true (nonzero) if the file is a PNG.
132
png_check_sig(png_bytep sig, int num)
134
return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
137
/* Function to allocate memory for zlib and clear it to 0. */
143
png_zalloc(voidpf png_ptr, uInt items, uInt size)
146
png_structp p=png_ptr;
147
png_uint_32 save_flags=p->flags;
148
png_uint_32 num_bytes;
150
if (items > PNG_UINT_32_MAX/size)
152
png_warning (png_ptr, "Potential overflow in png_zalloc()");
155
num_bytes = (png_uint_32)items * size;
157
p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
158
ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
161
#if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO)
163
return ((voidpf)ptr);
165
if (num_bytes > (png_uint_32)0x8000L)
167
png_memset(ptr, 0, (png_size_t)0x8000L);
168
png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
169
(png_size_t)(num_bytes - (png_uint_32)0x8000L));
173
png_memset(ptr, 0, (png_size_t)num_bytes);
176
return ((voidpf)ptr);
179
/* function to free memory for zlib */
185
png_zfree(voidpf png_ptr, voidpf ptr)
187
png_free((png_structp)png_ptr, (png_voidp)ptr);
190
/* Reset the CRC variable to 32 bits of 1's. Care must be taken
191
* in case CRC is > 32 bits to leave the top bits 0.
194
png_reset_crc(png_structp png_ptr)
196
png_ptr->crc = crc32(0, Z_NULL, 0);
199
/* Calculate the CRC over a section of data. We can only pass as
200
* much data to this routine as the largest single buffer size. We
201
* also check that this data will actually be used before going to the
202
* trouble of calculating it.
205
png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
209
if (png_ptr->chunk_name[0] & 0x20) /* ancillary */
211
if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
212
(PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
217
if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
222
png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
225
/* Allocate the memory for an info_struct for the application. We don't
226
* really need the png_ptr, but it could potentially be useful in the
227
* future. This should be used in favour of malloc(png_sizeof(png_info))
228
* and png_info_init() so that applications that want to use a shared
229
* libpng don't have to be recompiled if png_info changes size.
232
png_create_info_struct(png_structp png_ptr)
236
png_debug(1, "in png_create_info_struct\n");
237
if(png_ptr == NULL) return (NULL);
238
#ifdef PNG_USER_MEM_SUPPORTED
239
info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
240
png_ptr->malloc_fn, png_ptr->mem_ptr);
242
info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
244
if (info_ptr != NULL)
245
png_info_init_3(&info_ptr, png_sizeof(png_info));
250
/* This function frees the memory associated with a single info struct.
251
* Normally, one would use either png_destroy_read_struct() or
252
* png_destroy_write_struct() to free an info struct, but this may be
253
* useful for some applications.
256
png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
258
png_infop info_ptr = NULL;
260
png_debug(1, "in png_destroy_info_struct\n");
261
if (info_ptr_ptr != NULL)
262
info_ptr = *info_ptr_ptr;
264
if (info_ptr != NULL)
266
png_info_destroy(png_ptr, info_ptr);
268
#ifdef PNG_USER_MEM_SUPPORTED
269
png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
272
png_destroy_struct((png_voidp)info_ptr);
274
*info_ptr_ptr = NULL;
278
/* Initialize the info structure. This is now an internal function (0.89)
279
* and applications using it are urged to use png_create_info_struct()
282
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
285
png_info_init(png_infop info_ptr)
287
/* We only come here via pre-1.0.12-compiled applications */
288
png_info_init_3(&info_ptr, 0);
293
png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
295
png_infop info_ptr = *ptr_ptr;
297
png_debug(1, "in png_info_init_3\n");
299
if(png_sizeof(png_info) > png_info_struct_size)
301
png_destroy_struct(info_ptr);
302
info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
306
/* set everything to 0 */
307
png_memset(info_ptr, 0, png_sizeof (png_info));
310
#ifdef PNG_FREE_ME_SUPPORTED
312
png_data_freer(png_structp png_ptr, png_infop info_ptr,
313
int freer, png_uint_32 mask)
315
png_debug(1, "in png_data_freer\n");
316
if (png_ptr == NULL || info_ptr == NULL)
318
if(freer == PNG_DESTROY_WILL_FREE_DATA)
319
info_ptr->free_me |= mask;
320
else if(freer == PNG_USER_WILL_FREE_DATA)
321
info_ptr->free_me &= ~mask;
324
"Unknown freer parameter in png_data_freer.");
329
png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
332
png_debug(1, "in png_free_data\n");
333
if (png_ptr == NULL || info_ptr == NULL)
336
#if defined(PNG_TEXT_SUPPORTED)
337
/* free text item num or (if num == -1) all text items */
338
#ifdef PNG_FREE_ME_SUPPORTED
339
if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
341
if (mask & PNG_FREE_TEXT)
346
if (info_ptr->text && info_ptr->text[num].key)
348
png_free(png_ptr, info_ptr->text[num].key);
349
info_ptr->text[num].key = NULL;
355
for (i = 0; i < info_ptr->num_text; i++)
356
png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
357
png_free(png_ptr, info_ptr->text);
358
info_ptr->text = NULL;
359
info_ptr->num_text=0;
364
#if defined(PNG_tRNS_SUPPORTED)
365
/* free any tRNS entry */
366
#ifdef PNG_FREE_ME_SUPPORTED
367
if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
369
if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
372
png_free(png_ptr, info_ptr->trans);
373
info_ptr->valid &= ~PNG_INFO_tRNS;
374
#ifndef PNG_FREE_ME_SUPPORTED
375
png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
377
info_ptr->trans = NULL;
381
#if defined(PNG_sCAL_SUPPORTED)
382
/* free any sCAL entry */
383
#ifdef PNG_FREE_ME_SUPPORTED
384
if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
386
if (mask & PNG_FREE_SCAL)
389
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
390
png_free(png_ptr, info_ptr->scal_s_width);
391
png_free(png_ptr, info_ptr->scal_s_height);
392
info_ptr->scal_s_width = NULL;
393
info_ptr->scal_s_height = NULL;
395
info_ptr->valid &= ~PNG_INFO_sCAL;
399
#if defined(PNG_pCAL_SUPPORTED)
400
/* free any pCAL entry */
401
#ifdef PNG_FREE_ME_SUPPORTED
402
if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
404
if (mask & PNG_FREE_PCAL)
407
png_free(png_ptr, info_ptr->pcal_purpose);
408
png_free(png_ptr, info_ptr->pcal_units);
409
info_ptr->pcal_purpose = NULL;
410
info_ptr->pcal_units = NULL;
411
if (info_ptr->pcal_params != NULL)
414
for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
416
png_free(png_ptr, info_ptr->pcal_params[i]);
417
info_ptr->pcal_params[i]=NULL;
419
png_free(png_ptr, info_ptr->pcal_params);
420
info_ptr->pcal_params = NULL;
422
info_ptr->valid &= ~PNG_INFO_pCAL;
426
#if defined(PNG_iCCP_SUPPORTED)
427
/* free any iCCP entry */
428
#ifdef PNG_FREE_ME_SUPPORTED
429
if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
431
if (mask & PNG_FREE_ICCP)
434
png_free(png_ptr, info_ptr->iccp_name);
435
png_free(png_ptr, info_ptr->iccp_profile);
436
info_ptr->iccp_name = NULL;
437
info_ptr->iccp_profile = NULL;
438
info_ptr->valid &= ~PNG_INFO_iCCP;
442
#if defined(PNG_sPLT_SUPPORTED)
443
/* free a given sPLT entry, or (if num == -1) all sPLT entries */
444
#ifdef PNG_FREE_ME_SUPPORTED
445
if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
447
if (mask & PNG_FREE_SPLT)
452
if(info_ptr->splt_palettes)
454
png_free(png_ptr, info_ptr->splt_palettes[num].name);
455
png_free(png_ptr, info_ptr->splt_palettes[num].entries);
456
info_ptr->splt_palettes[num].name = NULL;
457
info_ptr->splt_palettes[num].entries = NULL;
462
if(info_ptr->splt_palettes_num)
465
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
466
png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
468
png_free(png_ptr, info_ptr->splt_palettes);
469
info_ptr->splt_palettes = NULL;
470
info_ptr->splt_palettes_num = 0;
472
info_ptr->valid &= ~PNG_INFO_sPLT;
477
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
478
#ifdef PNG_FREE_ME_SUPPORTED
479
if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
481
if (mask & PNG_FREE_UNKN)
486
if(info_ptr->unknown_chunks)
488
png_free(png_ptr, info_ptr->unknown_chunks[num].data);
489
info_ptr->unknown_chunks[num].data = NULL;
496
if(info_ptr->unknown_chunks_num)
498
for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
499
png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
501
png_free(png_ptr, info_ptr->unknown_chunks);
502
info_ptr->unknown_chunks = NULL;
503
info_ptr->unknown_chunks_num = 0;
509
#if defined(PNG_hIST_SUPPORTED)
510
/* free any hIST entry */
511
#ifdef PNG_FREE_ME_SUPPORTED
512
if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
514
if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
517
png_free(png_ptr, info_ptr->hist);
518
info_ptr->hist = NULL;
519
info_ptr->valid &= ~PNG_INFO_hIST;
520
#ifndef PNG_FREE_ME_SUPPORTED
521
png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
526
/* free any PLTE entry that was internally allocated */
527
#ifdef PNG_FREE_ME_SUPPORTED
528
if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
530
if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
533
png_zfree(png_ptr, info_ptr->palette);
534
info_ptr->palette = NULL;
535
info_ptr->valid &= ~PNG_INFO_PLTE;
536
#ifndef PNG_FREE_ME_SUPPORTED
537
png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
539
info_ptr->num_palette = 0;
542
#if defined(PNG_INFO_IMAGE_SUPPORTED)
543
/* free any image bits attached to the info structure */
544
#ifdef PNG_FREE_ME_SUPPORTED
545
if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
547
if (mask & PNG_FREE_ROWS)
550
if(info_ptr->row_pointers)
553
for (row = 0; row < (int)info_ptr->height; row++)
555
png_free(png_ptr, info_ptr->row_pointers[row]);
556
info_ptr->row_pointers[row]=NULL;
558
png_free(png_ptr, info_ptr->row_pointers);
559
info_ptr->row_pointers=NULL;
561
info_ptr->valid &= ~PNG_INFO_IDAT;
565
#ifdef PNG_FREE_ME_SUPPORTED
567
info_ptr->free_me &= ~mask;
569
info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
573
/* This is an internal routine to free any memory that the info struct is
574
* pointing to before re-using it or freeing the struct itself. Recall
575
* that png_free() checks for NULL pointers for us.
578
png_info_destroy(png_structp png_ptr, png_infop info_ptr)
580
png_debug(1, "in png_info_destroy\n");
582
png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
584
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
585
if (png_ptr->num_chunk_list)
587
png_free(png_ptr, png_ptr->chunk_list);
588
png_ptr->chunk_list=NULL;
589
png_ptr->num_chunk_list=0;
593
png_info_init_3(&info_ptr, png_sizeof(png_info));
596
/* This function returns a pointer to the io_ptr associated with the user
597
* functions. The application should free any memory associated with this
598
* pointer before png_write_destroy() or png_read_destroy() are called.
601
png_get_io_ptr(png_structp png_ptr)
603
return (png_ptr->io_ptr);
606
#if !defined(PNG_NO_STDIO)
607
/* Initialize the default input/output functions for the PNG file. If you
608
* use your own read or write routines, you can call either png_set_read_fn()
609
* or png_set_write_fn() instead of png_init_io(). If you have defined
610
* PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
611
* necessarily available.
614
png_init_io(png_structp png_ptr, png_FILE_p fp)
616
png_debug(1, "in png_init_io\n");
617
png_ptr->io_ptr = (png_voidp)fp;
621
#if defined(PNG_TIME_RFC1123_SUPPORTED)
622
/* Convert the supplied time into an RFC 1123 string suitable for use in
623
* a "Creation Time" or other text-based time string.
626
png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
628
static PNG_CONST char short_months[12][4] =
629
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
630
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
632
if (png_ptr->time_buffer == NULL)
634
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
638
#if defined(_WIN32_WCE)
640
wchar_t time_buf[29];
641
wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
642
ptime->day % 32, short_months[(ptime->month - 1) % 12],
643
ptime->year, ptime->hour % 24, ptime->minute % 60,
645
WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
649
#ifdef USE_FAR_KEYWORD
651
char near_time_buf[29];
652
sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
653
ptime->day % 32, short_months[(ptime->month - 1) % 12],
654
ptime->year, ptime->hour % 24, ptime->minute % 60,
656
png_memcpy(png_ptr->time_buffer, near_time_buf,
657
29*png_sizeof(char));
660
sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
661
ptime->day % 32, short_months[(ptime->month - 1) % 12],
662
ptime->year, ptime->hour % 24, ptime->minute % 60,
665
#endif /* _WIN32_WCE */
666
return ((png_charp)png_ptr->time_buffer);
668
#endif /* PNG_TIME_RFC1123_SUPPORTED */
671
/* Signature string for a PNG file. */
675
return ((png_bytep)"\211\120\116\107\015\012\032\012");
680
png_get_copyright(png_structp png_ptr)
682
if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
683
return ((png_charp) "\n libpng version 1.2.8 - December 3, 2004\n\
684
Copyright (c) 1998-2004 Glenn Randers-Pehrson\n\
685
Copyright (c) 1996-1997 Andreas Dilger\n\
686
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
687
return ((png_charp) "");
690
/* The following return the library version as a short string in the
691
* format 1.0.0 through 99.99.99zz. To get the version of *.h files
692
* used with your application, print out PNG_LIBPNG_VER_STRING, which
693
* is defined in png.h.
694
* Note: now there is no difference between png_get_libpng_ver() and
695
* png_get_header_ver(). Due to the version_nn_nn_nn typedef guard,
696
* it is guaranteed that png.c uses the correct version of png.h.
699
png_get_libpng_ver(png_structp png_ptr)
701
/* Version of *.c files used when building libpng */
702
if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
703
return ((png_charp) PNG_LIBPNG_VER_STRING);
704
return ((png_charp) "");
708
png_get_header_ver(png_structp png_ptr)
710
/* Version of *.h files used when building libpng */
711
if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
712
return ((png_charp) PNG_LIBPNG_VER_STRING);
713
return ((png_charp) "");
717
png_get_header_version(png_structp png_ptr)
719
/* Returns longer string containing both version and date */
720
if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
721
return ((png_charp) PNG_HEADER_VERSION_STRING);
722
return ((png_charp) "");
725
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
727
png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
729
/* check chunk_name and return "keep" value if it's on the list, else 0 */
732
if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
734
p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
735
for (i = png_ptr->num_chunk_list; i; i--, p-=5)
736
if (!png_memcmp(chunk_name, p, 4))
737
return ((int)*(p+4));
742
/* This function, added to libpng-1.0.6g, is untested. */
744
png_reset_zstream(png_structp png_ptr)
746
return (inflateReset(&png_ptr->zstream));
749
/* This function was added to libpng-1.0.7 */
751
png_access_version_number(void)
753
/* Version of *.c files used when building libpng */
754
return((png_uint_32) PNG_LIBPNG_VER);
758
#if !defined(PNG_1_0_X)
759
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
760
/* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */
761
/* this INTERNAL function was added to libpng 1.2.0 */
763
png_init_mmx_flags (png_structp png_ptr)
765
png_ptr->mmx_rowbytes_threshold = 0;
766
png_ptr->mmx_bitdepth_threshold = 0;
768
# if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD))
770
png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;
772
if (png_mmx_support() > 0) {
773
png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
774
# ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
775
| PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
777
# ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
778
| PNG_ASM_FLAG_MMX_READ_INTERLACE
780
# ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
783
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB
784
| PNG_ASM_FLAG_MMX_READ_FILTER_UP
785
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG
786
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
788
png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
789
png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
792
png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
794
| PNG_MMX_WRITE_FLAGS );
797
# else /* !((PNGVCRD || PNGGCCRD) && PNG_ASSEMBLER_CODE_SUPPORTED)) */
799
/* clear all MMX flags; no support is compiled in */
800
png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );
802
# endif /* ?(PNGVCRD || PNGGCCRD) */
805
#endif /* !(PNG_ASSEMBLER_CODE_SUPPORTED) */
807
/* this function was added to libpng 1.2.0 */
808
#if !defined(PNG_USE_PNGGCCRD) && \
809
!(defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD))
811
png_mmx_support(void)
816
#endif /* PNG_1_0_X */
819
/* Added at libpng version 1.2.6 */
820
PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
822
png_convert_size(size_t size)
824
if (size > (png_size_t)-1)
825
PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
826
return ((png_size_t)size);
828
#endif /* PNG_SIZE_T */