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Clarified usage of sig_bit as struct vs sig_bit_p as pointer in example.c

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sig_bit was not declared in write_png() and was used differently from
sig_bit in read_png(), as reported by Vincent Torri.  This update changes
sig_bit to sig_bit_p in read_png() and declares sig_bit in write_png().
This commit is contained in:
Glenn Randers-Pehrson
2009-05-13 05:18:48 -05:00
parent 549a5101e7
commit e38b432846
3 changed files with 15 additions and 8 deletions
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11
example.c
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@@ -2,7 +2,7 @@
#if 0 /* in case someone actually tries to compile this */
/* example.c - an example of using libpng
* Last changed in libpng 1.2.36 [May 7, 2009]
* Last changed in libpng 1.2.37 [May 13, 2009]
* This file has been placed in the public domain by the authors.
* Maintained 1998-2009 Glenn Randers-Pehrson
* Maintained 1996, 1997 Andreas Dilger)
@@ -306,10 +306,10 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
*/
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
{
png_color_8p sig_bit;
png_color_8p sig_bit_p;
png_get_sBIT(png_ptr, info_ptr, &sig_bit);
png_set_shift(png_ptr, sig_bit);
png_get_sBIT(png_ptr, info_ptr, &sig_bit_p);
png_set_shift(png_ptr, sig_bit_p);
}
/* flip the RGB pixels to BGR (or RGBA to BGRA) */
@@ -647,6 +647,7 @@ void write_png(char *file_name /* , ... other image information ... */)
the png structure. */
/* optional significant bit chunk */
png_color_8 sig_bit;
/* if we are dealing with a grayscale image then */
sig_bit.gray = true_bit_depth;
/* otherwise, if we are dealing with a color image then */
@@ -655,7 +656,7 @@ void write_png(char *file_name /* , ... other image information ... */)
sig_bit.blue = true_blue_bit_depth;
/* if the image has an alpha channel then */
sig_bit.alpha = true_alpha_bit_depth;
png_set_sBIT(png_ptr, info_ptr, sig_bit);
png_set_sBIT(png_ptr, info_ptr, &sig_bit);
/* Optional gamma chunk is strongly suggested if you have any guess