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better gif-loop handling (again)

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setting loops to 0 was broken
This commit is contained in:
John Cupitt 2019-04-29 17:12:20 +01:00
parent 522ddc1430
commit ea9e477ad3
1 changed files with 9 additions and 3 deletions
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12
libvips/foreign/magicksave.c
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@ -143,12 +143,18 @@ vips_foreign_save_magick_next_image( VipsForeignSaveMagick *magick )
!vips_image_get_int( im, "gif-delay", &number ) )
image->delay = (size_t) number;
/* ImageMagick uses 0 to mean unset, so we must always add 1. See
* coders/gif.c.
/* ImageMagick uses iterations like this (at least in gif save):
* 0 - set 0 loops (infinite)
* 1 - don't write the netscape extension block
* 2 - loop once
* 3 - loop twice etc.
*
* We have the simple gif meaning, so we must add one unless it's
* zero.
*/
if( vips_image_get_typeof( im, "gif-loop" ) &&
!vips_image_get_int( im, "gif-loop", &number ) )
image->iterations = (size_t) (number + 1);
image->iterations = (size_t) (number ? number + 1 : 0);
if( vips_image_get_typeof( im, "gif-comment" ) &&
!vips_image_get_string( im, "gif-comment", &str ) )