mewin/libpng
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Imported from libpng-1.0.0.tar

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This commit is contained in:
Glenn Randers-Pehrson
1998-03-08 18:52:15 -06:00
parent 397100eb8a
commit 0f7202f074
32 changed files with 113 additions and 73 deletions
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10
example.c
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@@ -15,7 +15,7 @@
#include "png.h"
/* Check to see if a file is a PNG file using png_check_sig(). Returns
/* Check to see if a file is a PNG file using png_sig_cmp(). Returns
* non-zero if the image is a PNG, and 0 if it isn't a PNG.
*
* If this call is successful, and you are going to keep the file open,
@@ -29,7 +29,7 @@
*
* Many applications already read the first 2 or 4 bytes from the start
* of the image to determine the file type, so it would be easiest just
* to pass the bytes to png_check_sig() or even skip that if you know
* to pass the bytes to png_sig_cmp() or even skip that if you know
* you have a PNG file, and call png_set_sig_bytes().
*/
#define PNG_BYTES_TO_CHECK 4
@@ -46,7 +46,7 @@ int check_if_png(char *file_name, FILE **fp)
return 0;
/* Compare the first PNG_BYTES_TO_CHECK bytes of the signature. */
return(png_check_sig(buf, PNG_BYTES_TO_CHECK));
return(png_sig_cmp(buf, (png_size_t)0, PNG_BYTES_TO_CHECK));
}
/* Read a PNG file. You may want to return an error code if the read
@@ -92,7 +92,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
}
/* Allocate/initialize the memory for image information. REQUIRED. */
info_ptr = png_create_info_struct();
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
{
fclose(fp);
@@ -127,7 +127,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
#endif no_streams /* Use only one I/O method! */
/* If we have already read some of the signature */
png_set_sig_bytes_read(png_ptr, sig_read);
png_set_sig_bytes(png_ptr, sig_read);
/* The call to png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk). REQUIRED