sergiotarxz/libvips
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

apply --centre to upsize as well as down

Browse Source 
we were just using the --centre flag in resize to influence downsize
behaviour -- use it to set upsize as well

see https://github.com/jcupitt/libvips/issues/705
This commit is contained in:
John Cupitt 2017-11-25 12:09:01 +00:00
parent bb81113312
commit cb128eb258
1 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
libvips/resample/resize.c
View File

@ -26,6 +26,8 @@
* - moved the cache to shrinkv
* 15/10/17
* - make LINEAR and CUBIC adaptive
* 25/11/17
* - apply --centre to upsize as well, thanks tback
*/
/*
@ -235,6 +237,12 @@ vips_resize_build( VipsObject *object )
if( hscale > 1.0 ||
vscale > 1.0 ) {
const char *nickname = vips_resize_interpolate( resize->kernel );
/* Input displacement. For centre sampling, shift by 0.5 down
* and right.
*/
double id = resize->centre ? 0.5 : 0.0;
VipsInterpolate *interpolate;
if( !(interpolate = vips_interpolate_new( nickname )) )
@ -257,6 +265,8 @@ vips_resize_build( VipsObject *object )
if( vips_affine( in, &t[4],
hscale, 0.0, 0.0, vscale,
"interpolate", interpolate,
"idx", id,
"idy", id,
NULL ) )
return( -1 );
in = t[4];
@ -265,6 +275,8 @@ vips_resize_build( VipsObject *object )
g_info( "residual scale %g", hscale );
if( vips_affine( in, &t[4], hscale, 0.0, 0.0, 1.0,
"interpolate", interpolate,
"idx", id,
"idy", id,
NULL ) )
return( -1 );
in = t[4];
@ -273,6 +285,8 @@ vips_resize_build( VipsObject *object )
g_info( "residual scale %g", vscale );
if( vips_affine( in, &t[4], 1.0, 0.0, 0.0, vscale,
"interpolate", interpolate,
"idx", id,
"idy", id,
NULL ) )
return( -1 );
in = t[4];