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openslide tile cache was too small

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we were reloading tiles when fetching areas that crossed tile boundaries
This commit is contained in:
John Cupitt 2019-03-14 12:05:15 +00:00
parent a663a1bb1c
commit 40733d4482
1 changed files with 4 additions and 3 deletions
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7
libvips/foreign/openslide2vips.c
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@ -535,14 +535,15 @@ vips__openslide_read( const char *filename, VipsImage *out,
NULL, vips__openslide_generate, NULL, rslide, NULL ) )
return( -1 );
/* Copy to out, adding a cache. Enough tiles for a complete row, plus
* 50%.
/* Copy to out, adding a cache. Enough tiles for two complete rows,
* plus 50%. We need at least two rows, or we'll constantly reload
* tiles if they cross a tile boundary.
*/
if( vips_tilecache( raw, &t,
"tile_width", rslide->tile_width,
"tile_height", rslide->tile_height,
"max_tiles",
(int) (1.5 * (1 + raw->Xsize / rslide->tile_width)),
(int) (2.5 * (1 + raw->Xsize / rslide->tile_width)),
"threaded", TRUE,
NULL ) )
return( -1 );