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Imported from libpng-1.0.2a.tar

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This commit is contained in:
Glenn Randers-Pehrson
1998-12-29 11:47:59 -06:00
parent 345bc27e70
commit 5c6aeb25c1
45 changed files with 1160 additions and 735 deletions
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18
example.c
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@@ -220,11 +220,14 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
if (png_get_sRGB(png_ptr, info_ptr, &intent))
png_set_sRGB(png_ptr, intent, 0);
else
else
{
double image_gamma;
if (png_get_gAMA(png_ptr, info_ptr, &image_gamma))
png_set_gamma(png_ptr, screen_gamma, image_gamma);
else
png_set_gamma(png_ptr, screen_gamma, 0.50);
png_set_gamma(png_ptr, screen_gamma, 0.45455);
}
/* Dither RGB files down to 8 bit palette or reduce palettes
* to the number of colors available on your screen.
@@ -324,13 +327,13 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
{
#ifdef sparkle /* Read the image using the "sparkle" effect. */
png_read_rows(png_ptr, &row_pointers[y], NULL, number_of_rows);
png_read_rows(png_ptr, NULL, row_pointers[y], number_of_rows);
#else no_sparkle /* Read the image using the "rectangle" effect */
png_read_rows(png_ptr, NULL, &row_pointers[y], number_of_rows);
#endif no_sparkle /* use only one of these two methods */
}
/* if you want to display the image after every pass, do
so here */
#endif no_single /* use only one of these two methods */
@@ -384,8 +387,11 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
return ERROR;
}
/* this one's new. You will need to provide all three
/* This one's new. You will need to provide all three
* function callbacks, even if you aren't using them all.
* If you aren't using all functions, you can specify NULL
* parameters. Even when all three functions are NULL,
* you need to call png_set_progressive_read_fn().
* These functions shouldn't be dependent on global or
* static variables if you are decoding several images
* simultaneously. You should store stream specific data
@@ -565,7 +571,7 @@ void write_png(char *file_name /* , ... other image information ... */)
sig_bit.alpha = true_alpha_bit_depth;
png_set_sBIT(png_ptr, info_ptr, sig_bit);
/* Optional gamma chunk is strongly suggested if you have any guess
* as to the correct gamma of the image.
*/