2
/* png.c - location for general purpose libpng functions
4
* libpng version 1.2.7 - September 12, 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)
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* (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. */
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typedef version_1_2_7 Your_png_h_is_not_version_1_2_7;
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 */
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const char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
25
/* png_sig was changed to a function in version 1.0.5c */
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/* Place to hold the signature string for a PNG file. */
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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 */
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/* start of interlace block */
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const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
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/* offset to next interlace block */
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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 */
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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 */
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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) */
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#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
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const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
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/* Height of interlace block. This is not currently used - if you need
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* it, uncomment it here and in png.h
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const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
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/* Mask to determine which pixels are valid in a pass */
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const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
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/* Mask to determine which pixels to overwrite while displaying */
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const int FARDATA png_pass_dsp_mask[]
81
= {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
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/* Tells libpng that we have already handled the first "num_bytes" bytes
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* of the PNG file signature. If the PNG data is embedded into another
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* 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)
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png_debug(1, "in png_set_sig_bytes\n");
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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
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* 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
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* an integer less than, equal to, or greater than zero if sig is found,
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* respectively, to be less than, to match, or be greater than the correct
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* PNG signature (this is the same behaviour as strcmp, memcmp, etc).
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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)
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else if (num_to_check < 1)
121
if (start + num_to_check > 8)
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num_to_check = 8 - start;
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return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
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/* (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.
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png_check_sig(png_bytep sig, int num)
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return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
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/* Function to allocate memory for zlib and clear it to 0. */
143
png_zalloc(voidpf png_ptr, uInt items, uInt size)
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png_structp p=(png_struct*)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;
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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,
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(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()
284
png_info_init(png_infop info_ptr)
286
/* We only come here via pre-1.0.12-compiled applications */
287
png_info_init_3(&info_ptr, 0);
291
png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
293
png_infop info_ptr = *ptr_ptr;
295
png_debug(1, "in png_info_init_3\n");
297
if(png_sizeof(png_info) > png_info_struct_size)
299
png_destroy_struct(info_ptr);
300
info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
304
/* set everything to 0 */
305
png_memset(info_ptr, 0, png_sizeof (png_info));
308
#ifdef PNG_FREE_ME_SUPPORTED
310
png_data_freer(png_structp png_ptr, png_infop info_ptr,
311
int freer, png_uint_32 mask)
313
png_debug(1, "in png_data_freer\n");
314
if (png_ptr == NULL || info_ptr == NULL)
316
if(freer == PNG_DESTROY_WILL_FREE_DATA)
317
info_ptr->free_me |= mask;
318
else if(freer == PNG_USER_WILL_FREE_DATA)
319
info_ptr->free_me &= ~mask;
322
"Unknown freer parameter in png_data_freer.");
327
png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
330
png_debug(1, "in png_free_data\n");
331
if (png_ptr == NULL || info_ptr == NULL)
334
#if defined(PNG_TEXT_SUPPORTED)
335
/* free text item num or (if num == -1) all text items */
336
#ifdef PNG_FREE_ME_SUPPORTED
337
if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
339
if (mask & PNG_FREE_TEXT)
344
if (info_ptr->text && info_ptr->text[num].key)
346
png_free(png_ptr, info_ptr->text[num].key);
347
info_ptr->text[num].key = NULL;
353
for (i = 0; i < info_ptr->num_text; i++)
354
png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
355
png_free(png_ptr, info_ptr->text);
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info_ptr->text = NULL;
357
info_ptr->num_text=0;
362
#if defined(PNG_tRNS_SUPPORTED)
363
/* free any tRNS entry */
364
#ifdef PNG_FREE_ME_SUPPORTED
365
if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
367
if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
370
png_free(png_ptr, info_ptr->trans);
371
info_ptr->valid &= ~PNG_INFO_tRNS;
372
#ifndef PNG_FREE_ME_SUPPORTED
373
png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
375
info_ptr->trans = NULL;
379
#if defined(PNG_sCAL_SUPPORTED)
380
/* free any sCAL entry */
381
#ifdef PNG_FREE_ME_SUPPORTED
382
if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
384
if (mask & PNG_FREE_SCAL)
387
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
388
png_free(png_ptr, info_ptr->scal_s_width);
389
png_free(png_ptr, info_ptr->scal_s_height);
390
info_ptr->scal_s_width = NULL;
391
info_ptr->scal_s_height = NULL;
393
info_ptr->valid &= ~PNG_INFO_sCAL;
397
#if defined(PNG_pCAL_SUPPORTED)
398
/* free any pCAL entry */
399
#ifdef PNG_FREE_ME_SUPPORTED
400
if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
402
if (mask & PNG_FREE_PCAL)
405
png_free(png_ptr, info_ptr->pcal_purpose);
406
png_free(png_ptr, info_ptr->pcal_units);
407
info_ptr->pcal_purpose = NULL;
408
info_ptr->pcal_units = NULL;
409
if (info_ptr->pcal_params != NULL)
412
for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
414
png_free(png_ptr, info_ptr->pcal_params[i]);
415
info_ptr->pcal_params[i]=NULL;
417
png_free(png_ptr, info_ptr->pcal_params);
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info_ptr->pcal_params = NULL;
420
info_ptr->valid &= ~PNG_INFO_pCAL;
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#if defined(PNG_iCCP_SUPPORTED)
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/* free any iCCP entry */
426
#ifdef PNG_FREE_ME_SUPPORTED
427
if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
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if (mask & PNG_FREE_ICCP)
432
png_free(png_ptr, info_ptr->iccp_name);
433
png_free(png_ptr, info_ptr->iccp_profile);
434
info_ptr->iccp_name = NULL;
435
info_ptr->iccp_profile = NULL;
436
info_ptr->valid &= ~PNG_INFO_iCCP;
440
#if defined(PNG_sPLT_SUPPORTED)
441
/* free a given sPLT entry, or (if num == -1) all sPLT entries */
442
#ifdef PNG_FREE_ME_SUPPORTED
443
if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
445
if (mask & PNG_FREE_SPLT)
450
if(info_ptr->splt_palettes)
452
png_free(png_ptr, info_ptr->splt_palettes[num].name);
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png_free(png_ptr, info_ptr->splt_palettes[num].entries);
454
info_ptr->splt_palettes[num].name = NULL;
455
info_ptr->splt_palettes[num].entries = NULL;
460
if(info_ptr->splt_palettes_num)
463
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
464
png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
466
png_free(png_ptr, info_ptr->splt_palettes);
467
info_ptr->splt_palettes = NULL;
468
info_ptr->splt_palettes_num = 0;
470
info_ptr->valid &= ~PNG_INFO_sPLT;
475
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
476
#ifdef PNG_FREE_ME_SUPPORTED
477
if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
479
if (mask & PNG_FREE_UNKN)
484
if(info_ptr->unknown_chunks)
486
png_free(png_ptr, info_ptr->unknown_chunks[num].data);
487
info_ptr->unknown_chunks[num].data = NULL;
494
if(info_ptr->unknown_chunks_num)
496
for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
497
png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
499
png_free(png_ptr, info_ptr->unknown_chunks);
500
info_ptr->unknown_chunks = NULL;
501
info_ptr->unknown_chunks_num = 0;
507
#if defined(PNG_hIST_SUPPORTED)
508
/* free any hIST entry */
509
#ifdef PNG_FREE_ME_SUPPORTED
510
if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
512
if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
515
png_free(png_ptr, info_ptr->hist);
516
info_ptr->hist = NULL;
517
info_ptr->valid &= ~PNG_INFO_hIST;
518
#ifndef PNG_FREE_ME_SUPPORTED
519
png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
524
/* free any PLTE entry that was internally allocated */
525
#ifdef PNG_FREE_ME_SUPPORTED
526
if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
528
if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
531
png_zfree(png_ptr, info_ptr->palette);
532
info_ptr->palette = NULL;
533
info_ptr->valid &= ~PNG_INFO_PLTE;
534
#ifndef PNG_FREE_ME_SUPPORTED
535
png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
537
info_ptr->num_palette = 0;
540
#if defined(PNG_INFO_IMAGE_SUPPORTED)
541
/* free any image bits attached to the info structure */
542
#ifdef PNG_FREE_ME_SUPPORTED
543
if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
545
if (mask & PNG_FREE_ROWS)
548
if(info_ptr->row_pointers)
551
for (row = 0; row < (int)info_ptr->height; row++)
553
png_free(png_ptr, info_ptr->row_pointers[row]);
554
info_ptr->row_pointers[row]=NULL;
556
png_free(png_ptr, info_ptr->row_pointers);
557
info_ptr->row_pointers=NULL;
559
info_ptr->valid &= ~PNG_INFO_IDAT;
563
#ifdef PNG_FREE_ME_SUPPORTED
565
info_ptr->free_me &= ~mask;
567
info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
571
/* This is an internal routine to free any memory that the info struct is
572
* pointing to before re-using it or freeing the struct itself. Recall
573
* that png_free() checks for NULL pointers for us.
576
png_info_destroy(png_structp png_ptr, png_infop info_ptr)
578
png_debug(1, "in png_info_destroy\n");
580
png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
582
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
583
if (png_ptr->num_chunk_list)
585
png_free(png_ptr, png_ptr->chunk_list);
586
png_ptr->chunk_list=NULL;
587
png_ptr->num_chunk_list=0;
591
png_info_init_3(&info_ptr, png_sizeof(png_info));
594
/* This function returns a pointer to the io_ptr associated with the user
595
* functions. The application should free any memory associated with this
596
* pointer before png_write_destroy() or png_read_destroy() are called.
599
png_get_io_ptr(png_structp png_ptr)
601
return (png_ptr->io_ptr);
604
#if !defined(PNG_NO_STDIO)
605
/* Initialize the default input/output functions for the PNG file. If you
606
* use your own read or write routines, you can call either png_set_read_fn()
607
* or png_set_write_fn() instead of png_init_io(). If you have defined
608
* PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
609
* necessarily available.
612
png_init_io(png_structp png_ptr, png_FILE_p fp)
614
png_debug(1, "in png_init_io\n");
615
png_ptr->io_ptr = (png_voidp)fp;
619
#if defined(PNG_TIME_RFC1123_SUPPORTED)
620
/* Convert the supplied time into an RFC 1123 string suitable for use in
621
* a "Creation Time" or other text-based time string.
624
png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
626
static PNG_CONST char short_months[12][4] =
627
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
628
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
630
if (png_ptr->time_buffer == NULL)
632
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
636
#if defined(_WIN32_WCE)
638
wchar_t time_buf[29];
639
wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
640
ptime->day % 32, short_months[(ptime->month - 1) % 12],
641
ptime->year, ptime->hour % 24, ptime->minute % 60,
643
WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
647
#ifdef USE_FAR_KEYWORD
649
char near_time_buf[29];
650
sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
651
ptime->day % 32, short_months[(ptime->month - 1) % 12],
652
ptime->year, ptime->hour % 24, ptime->minute % 60,
654
png_memcpy(png_ptr->time_buffer, near_time_buf,
655
29*png_sizeof(char));
658
sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
659
ptime->day % 32, short_months[(ptime->month - 1) % 12],
660
ptime->year, ptime->hour % 24, ptime->minute % 60,
663
#endif /* _WIN32_WCE */
664
return ((png_charp)png_ptr->time_buffer);
666
#endif /* PNG_TIME_RFC1123_SUPPORTED */
669
/* Signature string for a PNG file. */
673
return ((png_bytep)"\211\120\116\107\015\012\032\012");
678
png_get_copyright(png_structp png_ptr)
680
if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
681
return ((png_charp) "\n libpng version 1.2.7 - September 12, 2004\n\
682
Copyright (c) 1998-2004 Glenn Randers-Pehrson\n\
683
Copyright (c) 1996-1997 Andreas Dilger\n\
684
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
685
return ((png_charp) "");
688
/* The following return the library version as a short string in the
689
* format 1.0.0 through 99.99.99zz. To get the version of *.h files
690
* used with your application, print out PNG_LIBPNG_VER_STRING, which
691
* is defined in png.h.
692
* Note: now there is no difference between png_get_libpng_ver() and
693
* png_get_header_ver(). Due to the version_nn_nn_nn typedef guard,
694
* it is guaranteed that png.c uses the correct version of png.h.
697
png_get_libpng_ver(png_structp png_ptr)
699
/* Version of *.c files used when building libpng */
700
if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
701
return ((png_charp) PNG_LIBPNG_VER_STRING);
702
return ((png_charp) "");
706
png_get_header_ver(png_structp png_ptr)
708
/* Version of *.h files used when building libpng */
709
if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
710
return ((png_charp) PNG_LIBPNG_VER_STRING);
711
return ((png_charp) "");
715
png_get_header_version(png_structp png_ptr)
717
/* Returns longer string containing both version and date */
718
if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
719
return ((png_charp) PNG_HEADER_VERSION_STRING);
720
return ((png_charp) "");
723
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
725
png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
727
/* check chunk_name and return "keep" value if it's on the list, else 0 */
730
if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
732
p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
733
for (i = png_ptr->num_chunk_list; i; i--, p-=5)
734
if (!png_memcmp(chunk_name, p, 4))
735
return ((int)*(p+4));
740
/* This function, added to libpng-1.0.6g, is untested. */
742
png_reset_zstream(png_structp png_ptr)
744
return (inflateReset(&png_ptr->zstream));
747
/* This function was added to libpng-1.0.7 */
749
png_access_version_number(void)
751
/* Version of *.c files used when building libpng */
752
return((png_uint_32) PNG_LIBPNG_VER);
756
#if !defined(PNG_1_0_X)
757
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
758
/* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */
759
/* this INTERNAL function was added to libpng 1.2.0 */
761
png_init_mmx_flags (png_structp png_ptr)
763
png_ptr->mmx_rowbytes_threshold = 0;
764
png_ptr->mmx_bitdepth_threshold = 0;
766
# if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD))
768
png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;
770
if (png_mmx_support() > 0) {
771
png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
772
# ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
773
| PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
775
# ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
776
| PNG_ASM_FLAG_MMX_READ_INTERLACE
778
# ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
781
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB
782
| PNG_ASM_FLAG_MMX_READ_FILTER_UP
783
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG
784
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
786
png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
787
png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
790
png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
792
| PNG_MMX_WRITE_FLAGS );
795
# else /* !((PNGVCRD || PNGGCCRD) && PNG_ASSEMBLER_CODE_SUPPORTED)) */
797
/* clear all MMX flags; no support is compiled in */
798
png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );
800
# endif /* ?(PNGVCRD || PNGGCCRD) */
803
#endif /* !(PNG_ASSEMBLER_CODE_SUPPORTED) */
805
/* this function was added to libpng 1.2.0 */
806
#if !defined(PNG_USE_PNGGCCRD) && \
807
!(defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD))
809
png_mmx_support(void)
814
#endif /* PNG_1_0_X */
817
/* Added at libpng version 1.2.6 */
818
PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
820
png_convert_size(size_t size)
822
if (size > (png_size_t)-1)
823
PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
824
return ((png_size_t)size);
826
#endif /* PNG_SIZE_T */