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add a seq to thumbnail_image 

otherwise we can get horrible cache thrashing as the shrink will run
without any locality
This commit is contained in:
John Cupitt 2022-04-14 10:37:17 +01:00
parent eba9ec0dd7
commit 55723a980f
1 changed files with 12 additions and 2 deletions
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14
libvips/resample/thumbnail.c
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@ -33,6 +33,8 @@
* 27/2/21
* - simplify rules re. processing space, colour management and linear
* mode
* 14/4/22
* - add a seq to thumbnail_image to stop cache thrashing
*/
/*
@ -1706,10 +1708,18 @@ static VipsImage *
vips_thumbnail_image_open( VipsThumbnail *thumbnail, double factor )
{
VipsThumbnailImage *image = (VipsThumbnailImage *) thumbnail;
VipsImage **t = (VipsImage **)
vips_object_local_array( VIPS_OBJECT( thumbnail ), 1 );
g_object_ref( image->in );
/* We want thumbnail to run in sequential mode on this image, or we
* may get horrible cache thrashing.
*/
if( vips_sequential( image->in, &t[0], "tile-height", 16, NULL ) )
return( NULL );
return( image->in );
g_object_ref( t[0] );
return( t[0] );
}
static void