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better mask sizing for gaussmat

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We were calculating the mask size incorrectly for small masks.

Thanks johntrunc

see https://github.com/libvips/libvips/issues/1793
This commit is contained in:
John Cupitt 2020-08-31 13:37:08 +01:00
parent 99423649b9
commit 285ab2e6cc
2 changed files with 2 additions and 1 deletions
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1
ChangeLog
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@ -5,6 +5,7 @@
- stop 0-length buffer being passed to imagemagick [lovell] - stop 0-length buffer being passed to imagemagick [lovell]
- convert no-profile CMYK to RGB on save [augustocdias] - convert no-profile CMYK to RGB on save [augustocdias]
- ensure SVG loader skips input with chars outside x09-x7F range [lovell] - ensure SVG loader skips input with chars outside x09-x7F range [lovell]
- better mask sizing in gaussmat [johntrunc]
24/1/20 started 8.10.0 24/1/20 started 8.10.0
- more conformat IIIF output from dzsave [regisrob] - more conformat IIIF output from dzsave [regisrob]

2
libvips/create/gaussmat.c
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@ -129,7 +129,7 @@ vips_gaussmat_build( VipsObject *object )
vips_error( class->nickname, "%s", _( "mask too large" ) ); vips_error( class->nickname, "%s", _( "mask too large" ) );
return( -1 ); return( -1 );
} }
width = 2 * x - 1; width = 2 * VIPS_MAX( x - 1, 0 ) + 1;
height = gaussmat->separable ? 1 : width; height = gaussmat->separable ? 1 : width;
vips_image_init_fields( create->out, vips_image_init_fields( create->out,