mewin/libpng
1
0
Fork 0
mirror of https://git.code.sf.net/p/libpng/code.git synced 2025-07-10 18:04:09 +02:00
Code Issues Projects Releases Wiki Activity

pngminus: Expect all image transformations to be available in libpng

Browse Source 
The pngminus programs use several PNG image transformations:
`png_set_expand`, `png_set_expand_1_2_4_to_8`, etc. (in png2pnm.c);
`png_set_packing`, `png_set_invert_mono`, etc. (in pnm2png.c).
The availability of all of these transformations in libpng is now
required at compile time.

On the topic of transformations, apply an unrelated fix to the use
of `png_set_gamma`.
This commit is contained in:
Cosmin Truta
2024-01-09 00:33:39 +02:00
parent bdbbcaa457
commit 6beae586d6
2 changed files with 7 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
contrib/pngminus/png2pnm.c
View File

@@ -224,7 +224,7 @@ BOOL png2pnm_internal (png_struct *png_ptr, png_info *info_ptr,
/* set up (if applicable) the expansion of grayscale images to bit-depth 8 */
png_set_expand_gray_1_2_4_to_8 (png_ptr);
#ifdef NJET /* FIXME */
#ifdef NJET
/* downgrade 16-bit images to 8-bit */
if (bit_depth == 16)
png_set_strip_16 (png_ptr);
@@ -232,9 +232,12 @@ BOOL png2pnm_internal (png_struct *png_ptr, png_info *info_ptr,
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb (png_ptr);
/* only if file has a file gamma, we do a correction */
if (png_get_gAMA (png_ptr, info_ptr, &file_gamma))
png_set_gamma (png_ptr, (double) 2.2, file_gamma);
/* if the PNG image has a gAMA chunk then gamma-correct the output image */
{
double file_gamma;
if (png_get_gAMA (png_ptr, info_ptr, &file_gamma))
png_set_gamma (png_ptr, (double) 2.2, file_gamma);
}
#endif
/* read the image file, with all of the above image transforms applied */