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Imported from libpng-1.0.5s.tar

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This commit is contained in:
Glenn Randers-Pehrson
2000-02-18 13:48:52 -06:00
parent 61c32d9e66
commit a77ef625a6
47 changed files with 532 additions and 544 deletions
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35
example.c
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@@ -111,7 +111,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
* the normal method of doing things with libpng). REQUIRED unless you
* set up your own error handlers in the png_create_read_struct() earlier.
*/
if (setjmp(png_ptr->jmpbuf))
if (setjmp(png_jmp_env(png_ptr)))
{
/* Free all of the memory associated with the png_ptr and info_ptr */
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
@@ -405,7 +405,7 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
return ERROR;
}
if (setjmp((*png_ptr)->jmpbuf))
if (setjmp(png_jmp_env((*png_ptr))))
{
png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
return ERROR;
@@ -433,7 +433,7 @@ int
process_data(png_structp *png_ptr, png_infop *info_ptr,
png_bytep buffer, png_uint_32 length)
{
if (setjmp((*png_ptr)->jmpbuf))
if (setjmp(png_jmp_env((*png_ptr))))
{
/* Free the png_ptr and info_ptr memory on error */
png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
@@ -515,6 +515,7 @@ void write_png(char *file_name /* , ... other image information ... */)
FILE *fp;
png_structp png_ptr;
png_infop info_ptr;
png_colorp palette;
/* open the file */
fp = fopen(file_name, "wb");
@@ -592,11 +593,9 @@ void write_png(char *file_name /* , ... other image information ... */)
palette = (png_colorp)png_malloc(png_ptr, 256 * sizeof (png_color));
/* ... set palette colors ... */
png_set_PLTE(png_ptr, info_ptr, palette, 256);
/* You can free the palette here if you like, since libpng has made its
own copy. In versions of libpng earlier than version 1.0.5n, it was
necessary to keep the palette until after png_write_end(), because
libpng was using the caller's copy. */
free(palette);
/* You must not free palette here, because png_set_PLTE only makes a link to
the palette that you malloced. Wait until you are about to destroy
the png structure. */
/* optional significant bit chunk */
/* if we are dealing with a grayscale image then */
@@ -699,10 +698,10 @@ void write_png(char *file_name /* , ... other image information ... */)
* use the first method if you aren't handling interlacing yourself.
*/
png_uint_32 k, height, width;
png_byte image[height][width];
png_byte image[height][width*bytes_per_pixel];
png_bytep row_pointers[height];
for (k = 0; k < height; k++)
row_pointers[k] = image + k*width;
row_pointers[k] = image + k*width*bytes_per_pixel;
/* One of the following output methods is REQUIRED */
#ifdef entire /* write out the entire image data in one call */
@@ -737,11 +736,17 @@ void write_png(char *file_name /* , ... other image information ... */)
png_write_end(png_ptr, info_ptr);
#endif hilevel
/* if you malloced a palette and have not already freed it, free it
here (do *not* free libpng's copy of the palette in info_ptr->palette,
as recommended in versions 1.0.5m and earlier of this example; libpng
now takes care of that automatically). */
free(palette);
/* If you png_malloced a palette, free it here (don't free info_ptr->palette,
as recommended in versions 1.0.5m and earlier of this example; if
libpng mallocs info_ptr->palette, libpng will free it). If you
allocated it with malloc() instead of png_malloc(), use free() instead
of png_free(). */
png_free(png_ptr, palette);
/* Similarly, if you png_malloced any data that you passed in with
png_set_something(), such as a hist or trans array, free it here,
when you can be sure that libpng is through with it. */
png_free(png_ptr, trans);
/* clean up after the write, and free any memory allocated */
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);