2 /* png.c - location for general purpose libpng functions
4 * libpng version 1.2.0 - September 1, 2001
5 * Copyright (c) 1998-2001 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (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_0 Your_png_h_is_not_version_1_2_0;
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] = "1.2.0";
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};
57 /* offset to next interlace block */
58 const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
60 /* start of interlace block in the y direction */
61 const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
63 /* offset to next interlace block in the y direction */
64 const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
66 /* 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};
85 /* 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.");
98 png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
101 /* 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)
112 png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
113 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. */
139 png_zalloc(voidpf png_ptr, uInt items, uInt size)
141 png_uint_32 num_bytes = (png_uint_32)items * size;
142 png_voidp ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
144 #ifndef PNG_NO_ZALLOC_ZERO
145 if (num_bytes > (png_uint_32)0x8000L)
147 png_memset(ptr, 0, (png_size_t)0x8000L);
148 png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
149 (png_size_t)(num_bytes - (png_uint_32)0x8000L));
153 png_memset(ptr, 0, (png_size_t)num_bytes);
156 return ((voidpf)ptr);
159 /* function to free memory for zlib */
161 png_zfree(voidpf png_ptr, voidpf ptr)
163 png_free((png_structp)png_ptr, (png_voidp)ptr);
166 /* Reset the CRC variable to 32 bits of 1's. Care must be taken
167 * in case CRC is > 32 bits to leave the top bits 0.
170 png_reset_crc(png_structp png_ptr)
172 png_ptr->crc = crc32(0, Z_NULL, 0);
175 /* Calculate the CRC over a section of data. We can only pass as
176 * much data to this routine as the largest single buffer size. We
177 * also check that this data will actually be used before going to the
178 * trouble of calculating it.
181 png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
185 if (png_ptr->chunk_name[0] & 0x20) /* ancillary */
187 if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
188 (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
193 if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
198 png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
201 /* Allocate the memory for an info_struct for the application. We don't
202 * really need the png_ptr, but it could potentially be useful in the
203 * future. This should be used in favour of malloc(sizeof(png_info))
204 * and png_info_init() so that applications that want to use a shared
205 * libpng don't have to be recompiled if png_info changes size.
208 png_create_info_struct(png_structp png_ptr)
212 png_debug(1, "in png_create_info_struct\n");
213 if(png_ptr == NULL) return (NULL);
214 #ifdef PNG_USER_MEM_SUPPORTED
215 if ((info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
216 png_ptr->malloc_fn, png_ptr->mem_ptr)) != NULL)
218 if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL)
221 png_info_init_3(&info_ptr, sizeof(png_info));
227 /* This function frees the memory associated with a single info struct.
228 * Normally, one would use either png_destroy_read_struct() or
229 * png_destroy_write_struct() to free an info struct, but this may be
230 * useful for some applications.
233 png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
235 png_infop info_ptr = NULL;
237 png_debug(1, "in png_destroy_info_struct\n");
238 if (info_ptr_ptr != NULL)
239 info_ptr = *info_ptr_ptr;
241 if (info_ptr != NULL)
243 png_info_destroy(png_ptr, info_ptr);
245 #ifdef PNG_USER_MEM_SUPPORTED
246 png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
249 png_destroy_struct((png_voidp)info_ptr);
251 *info_ptr_ptr = (png_infop)NULL;
255 /* Initialize the info structure. This is now an internal function (0.89)
256 * and applications using it are urged to use png_create_info_struct()
261 png_info_init(png_infop info_ptr)
263 /* We only come here via pre-1.0.12-compiled applications */
264 png_info_init_3(&info_ptr, 0);
268 png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
270 png_infop info_ptr = *ptr_ptr;
272 png_debug(1, "in png_info_init_3\n");
274 if(sizeof(png_info) > png_info_struct_size)
276 png_destroy_struct(info_ptr);
277 info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
281 /* set everything to 0 */
282 png_memset(info_ptr, 0, sizeof (png_info));
285 #ifdef PNG_FREE_ME_SUPPORTED
287 png_data_freer(png_structp png_ptr, png_infop info_ptr,
288 int freer, png_uint_32 mask)
290 png_debug(1, "in png_data_freer\n");
291 if (png_ptr == NULL || info_ptr == NULL)
293 if(freer == PNG_DESTROY_WILL_FREE_DATA)
294 info_ptr->free_me |= mask;
295 else if(freer == PNG_USER_WILL_FREE_DATA)
296 info_ptr->free_me &= ~mask;
299 "Unknown freer parameter in png_data_freer.");
304 png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
307 png_debug(1, "in png_free_data\n");
308 if (png_ptr == NULL || info_ptr == NULL)
311 #if defined(PNG_TEXT_SUPPORTED)
312 /* free text item num or (if num == -1) all text items */
313 #ifdef PNG_FREE_ME_SUPPORTED
314 if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
316 if (mask & PNG_FREE_TEXT)
321 if (info_ptr->text && info_ptr->text[num].key)
323 png_free(png_ptr, info_ptr->text[num].key);
324 info_ptr->text[num].key = NULL;
330 for (i = 0; i < info_ptr->num_text; i++)
331 png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
332 png_free(png_ptr, info_ptr->text);
333 info_ptr->text = NULL;
334 info_ptr->num_text=0;
339 #if defined(PNG_tRNS_SUPPORTED)
340 /* free any tRNS entry */
341 #ifdef PNG_FREE_ME_SUPPORTED
342 if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
344 if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
347 png_free(png_ptr, info_ptr->trans);
348 info_ptr->valid &= ~PNG_INFO_tRNS;
349 info_ptr->trans = NULL;
353 #if defined(PNG_sCAL_SUPPORTED)
354 /* free any sCAL entry */
355 #ifdef PNG_FREE_ME_SUPPORTED
356 if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
358 if (mask & PNG_FREE_SCAL)
361 #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
362 png_free(png_ptr, info_ptr->scal_s_width);
363 png_free(png_ptr, info_ptr->scal_s_height);
364 info_ptr->scal_s_width = NULL;
365 info_ptr->scal_s_height = NULL;
367 info_ptr->valid &= ~PNG_INFO_sCAL;
371 #if defined(PNG_pCAL_SUPPORTED)
372 /* free any pCAL entry */
373 #ifdef PNG_FREE_ME_SUPPORTED
374 if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
376 if (mask & PNG_FREE_PCAL)
379 png_free(png_ptr, info_ptr->pcal_purpose);
380 png_free(png_ptr, info_ptr->pcal_units);
381 info_ptr->pcal_purpose = NULL;
382 info_ptr->pcal_units = NULL;
383 if (info_ptr->pcal_params != NULL)
386 for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
388 png_free(png_ptr, info_ptr->pcal_params[i]);
389 info_ptr->pcal_params[i]=NULL;
391 png_free(png_ptr, info_ptr->pcal_params);
392 info_ptr->pcal_params = NULL;
394 info_ptr->valid &= ~PNG_INFO_pCAL;
398 #if defined(PNG_iCCP_SUPPORTED)
399 /* free any iCCP entry */
400 #ifdef PNG_FREE_ME_SUPPORTED
401 if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
403 if (mask & PNG_FREE_ICCP)
406 png_free(png_ptr, info_ptr->iccp_name);
407 png_free(png_ptr, info_ptr->iccp_profile);
408 info_ptr->iccp_name = NULL;
409 info_ptr->iccp_profile = NULL;
410 info_ptr->valid &= ~PNG_INFO_iCCP;
414 #if defined(PNG_sPLT_SUPPORTED)
415 /* free a given sPLT entry, or (if num == -1) all sPLT entries */
416 #ifdef PNG_FREE_ME_SUPPORTED
417 if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
419 if (mask & PNG_FREE_SPLT)
424 if(info_ptr->splt_palettes)
426 png_free(png_ptr, info_ptr->splt_palettes[num].name);
427 png_free(png_ptr, info_ptr->splt_palettes[num].entries);
428 info_ptr->splt_palettes[num].name = NULL;
429 info_ptr->splt_palettes[num].entries = NULL;
434 if(info_ptr->splt_palettes_num)
437 for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
438 png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
440 png_free(png_ptr, info_ptr->splt_palettes);
441 info_ptr->splt_palettes = NULL;
442 info_ptr->splt_palettes_num = 0;
444 info_ptr->valid &= ~PNG_INFO_sPLT;
449 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
450 #ifdef PNG_FREE_ME_SUPPORTED
451 if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
453 if (mask & PNG_FREE_UNKN)
458 if(info_ptr->unknown_chunks)
460 png_free(png_ptr, info_ptr->unknown_chunks[num].data);
461 info_ptr->unknown_chunks[num].data = NULL;
468 if(info_ptr->unknown_chunks_num)
470 for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
471 png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
473 png_free(png_ptr, info_ptr->unknown_chunks);
474 info_ptr->unknown_chunks = NULL;
475 info_ptr->unknown_chunks_num = 0;
481 #if defined(PNG_hIST_SUPPORTED)
482 /* free any hIST entry */
483 #ifdef PNG_FREE_ME_SUPPORTED
484 if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
486 if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
489 png_free(png_ptr, info_ptr->hist);
490 info_ptr->hist = NULL;
491 info_ptr->valid &= ~PNG_INFO_hIST;
495 /* free any PLTE entry that was internally allocated */
496 #ifdef PNG_FREE_ME_SUPPORTED
497 if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
499 if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
502 png_zfree(png_ptr, info_ptr->palette);
503 info_ptr->palette = NULL;
504 info_ptr->valid &= ~PNG_INFO_PLTE;
505 info_ptr->num_palette = 0;
508 #if defined(PNG_INFO_IMAGE_SUPPORTED)
509 /* free any image bits attached to the info structure */
510 #ifdef PNG_FREE_ME_SUPPORTED
511 if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
513 if (mask & PNG_FREE_ROWS)
516 if(info_ptr->row_pointers)
519 for (row = 0; row < (int)info_ptr->height; row++)
521 png_free(png_ptr, info_ptr->row_pointers[row]);
522 info_ptr->row_pointers[row]=NULL;
524 png_free(png_ptr, info_ptr->row_pointers);
525 info_ptr->row_pointers=NULL;
527 info_ptr->valid &= ~PNG_INFO_IDAT;
531 #ifdef PNG_FREE_ME_SUPPORTED
533 info_ptr->free_me &= ~mask;
535 info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
539 /* This is an internal routine to free any memory that the info struct is
540 * pointing to before re-using it or freeing the struct itself. Recall
541 * that png_free() checks for NULL pointers for us.
544 png_info_destroy(png_structp png_ptr, png_infop info_ptr)
546 png_debug(1, "in png_info_destroy\n");
548 png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
550 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
551 if (png_ptr->num_chunk_list)
553 png_free(png_ptr, png_ptr->chunk_list);
554 png_ptr->chunk_list=(png_bytep)NULL;
555 png_ptr->num_chunk_list=0;
559 png_info_init_3(&info_ptr, sizeof(png_info));
562 /* This function returns a pointer to the io_ptr associated with the user
563 * functions. The application should free any memory associated with this
564 * pointer before png_write_destroy() or png_read_destroy() are called.
567 png_get_io_ptr(png_structp png_ptr)
569 return (png_ptr->io_ptr);
572 #if !defined(PNG_NO_STDIO)
573 /* Initialize the default input/output functions for the PNG file. If you
574 * use your own read or write routines, you can call either png_set_read_fn()
575 * or png_set_write_fn() instead of png_init_io(). If you have defined
576 * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
577 * necessarily available.
580 png_init_io(png_structp png_ptr, png_FILE_p fp)
582 png_debug(1, "in png_init_io\n");
583 png_ptr->io_ptr = (png_voidp)fp;
587 #if defined(PNG_TIME_RFC1123_SUPPORTED)
588 /* Convert the supplied time into an RFC 1123 string suitable for use in
589 * a "Creation Time" or other text-based time string.
592 png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
594 static PNG_CONST char short_months[12][4] =
595 {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
596 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
598 if (png_ptr->time_buffer == NULL)
600 png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
604 #if defined(_WIN32_WCE)
606 wchar_t time_buf[29];
607 wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
608 ptime->day % 32, short_months[(ptime->month - 1) % 12],
609 ptime->year, ptime->hour % 24, ptime->minute % 60,
611 WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
615 #ifdef USE_FAR_KEYWORD
617 char near_time_buf[29];
618 sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
619 ptime->day % 32, short_months[(ptime->month - 1) % 12],
620 ptime->year, ptime->hour % 24, ptime->minute % 60,
622 png_memcpy(png_ptr->time_buffer, near_time_buf,
626 sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
627 ptime->day % 32, short_months[(ptime->month - 1) % 12],
628 ptime->year, ptime->hour % 24, ptime->minute % 60,
631 #endif /* _WIN32_WCE */
632 return ((png_charp)png_ptr->time_buffer);
634 #endif /* PNG_TIME_RFC1123_SUPPORTED */
637 /* Signature string for a PNG file. */
641 return ((png_bytep)"\211\120\116\107\015\012\032\012");
646 png_get_copyright(png_structp png_ptr)
648 if (png_ptr != NULL || png_ptr == NULL) /* silence compiler warning */
649 return ((png_charp) "\n libpng version 1.2.0 - September 1, 2001\n\
650 Copyright (c) 1998-2001 Glenn Randers-Pehrson\n\
651 Copyright (c) 1996, 1997 Andreas Dilger\n\
652 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n");
653 return ((png_charp) "");
656 /* The following return the library version as a short string in the
657 * format 1.0.0 through 99.99.99zz. To get the version of *.h files used
658 * with your application, print out PNG_LIBPNG_VER_STRING, which is defined
663 png_get_libpng_ver(png_structp png_ptr)
665 /* Version of *.c files used when building libpng */
666 if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
667 return((png_charp) "1.2.0");
668 return((png_charp) "1.2.0");
672 png_get_header_ver(png_structp png_ptr)
674 /* Version of *.h files used when building libpng */
675 if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
676 return((png_charp) PNG_LIBPNG_VER_STRING);
677 return((png_charp) PNG_LIBPNG_VER_STRING);
681 png_get_header_version(png_structp png_ptr)
683 /* Returns longer string containing both version and date */
684 if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
685 return((png_charp) PNG_HEADER_VERSION_STRING);
686 return((png_charp) PNG_HEADER_VERSION_STRING);
689 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
691 png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
693 /* check chunk_name and return "keep" value if it's on the list, else 0 */
696 if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
698 p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
699 for (i = png_ptr->num_chunk_list; i; i--, p-=5)
700 if (!png_memcmp(chunk_name, p, 4))
701 return ((int)*(p+4));
706 /* This function, added to libpng-1.0.6g, is untested. */
708 png_reset_zstream(png_structp png_ptr)
710 return (inflateReset(&png_ptr->zstream));
713 /* This function was added to libpng-1.0.7 */
715 png_access_version_number(void)
717 /* Version of *.c files used when building libpng */
718 return((png_uint_32) 10200L);
722 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
723 /* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */
724 /* this INTERNAL function was added to libpng 1.2.0 */
726 png_init_mmx_flags (png_structp png_ptr)
728 png_ptr->mmx_rowbytes_threshold = 0;
729 png_ptr->mmx_bitdepth_threshold = 0;
731 # if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD))
733 png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;
735 if (png_mmx_support()) {
736 png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
737 # ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
738 | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
740 # ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
741 | PNG_ASM_FLAG_MMX_READ_INTERLACE
743 # ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
746 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB
747 | PNG_ASM_FLAG_MMX_READ_FILTER_UP
748 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG
749 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
751 png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
752 png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
755 png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
757 | PNG_MMX_WRITE_FLAGS );
760 # else /* !((PNGVCRD || PNGGCCRD) && PNG_ASSEMBLER_CODE_SUPPORTED)) */
762 /* clear all MMX flags; no support is compiled in */
763 png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );
765 # endif /* ?(PNGVCRD || PNGGCCRD) */
768 #endif /* !(PNG_ASSEMBLER_CODE_SUPPORTED) */
770 /* this function was added to libpng 1.2.0 */
771 #if !defined(PNG_USE_PNGGCCRD) && \
772 !(defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD))
774 png_mmx_support(void)