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fix regression in thumbnail of pyr tiff 

The new subifd pyramid thumbnail code broke the old page-based pyramid
detector.

Thanks tand826

See https://github.com/libvips/libvips/issues/1784
This commit is contained in:
John Cupitt 2020-08-17 10:10:23 +01:00
parent b981911f67
commit cdcf63f8e5
2 changed files with 16 additions and 9 deletions
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1
ChangeLog
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@ -1,6 +1,7 @@
9/8/20 started 8.10.1
- fix markdown -> xml conversion in doc generation
- remove typedef redefinitions to please old gccs
- fix regression in tiff pyramid thumbnailing [tand826]
24/1/20 started 8.10.0
- more conformat IIIF output from dzsave [regisrob]

24
libvips/resample/thumbnail.c
View File

@ -135,10 +135,14 @@ typedef struct _VipsThumbnail {
int heif_thumbnail_width;
int heif_thumbnail_height;
/* For TIFF sources, open subifds rather than pages to get pyr layers.
/* For TIFF sources, open subifds to get pyr layers.
*/
gboolean subifd_pyramid;
/* For TIFF sources, open pages to get pyr layers.
*/
gboolean page_pyramid;
} VipsThumbnail;
typedef struct _VipsThumbnailClass {
@ -261,13 +265,10 @@ vips_thumbnail_get_tiff_pyramid_page( VipsThumbnail *thumbnail )
/* Single-page docs can't be pyramids.
*/
if( thumbnail->n_loaded_pages < 2 )
if( thumbnail->n_pages < 2 )
return;
/* Use n_loaded_pages not n_pages since we support thumbnailing a page
* or range of pages from a many-page tiff.
*/
for( i = 0; i < thumbnail->n_loaded_pages; i++ ) {
for( i = 0; i < thumbnail->n_pages; i++ ) {
VipsImage *page;
int level_width;
int level_height;
@ -301,9 +302,9 @@ vips_thumbnail_get_tiff_pyramid_page( VipsThumbnail *thumbnail )
#ifdef DEBUG
printf( "vips_thumbnail_get_tiff_pyramid_page: "
"%d layer pyramid detected\n",
thumbnail->n_loaded_pages );
thumbnail->n_pages );
#endif /*DEBUG*/
thumbnail->level_count = thumbnail->n_loaded_pages;
thumbnail->level_count = thumbnail->n_pages;
}
/* Detect a TIFF pyramid made of subifds following a roughly /2 shrink.
@ -549,7 +550,12 @@ vips_thumbnail_open( VipsThumbnail *thumbnail )
if( thumbnail->level_count == 0 ) {
thumbnail->subifd_pyramid = FALSE;
thumbnail->page_pyramid = TRUE;
vips_thumbnail_get_tiff_pyramid_page( thumbnail );
if( thumbnail->level_count == 0 )
thumbnail->page_pyramid = FALSE;
}
}
@ -1060,7 +1066,7 @@ vips_thumbnail_file_open( VipsThumbnail *thumbnail, double factor )
"access", VIPS_ACCESS_SEQUENTIAL,
"subifd", (int) factor,
NULL ) );
else if( thumbnail->level_count > 0 )
else if( thumbnail->page_pyramid )
return( vips_image_new_from_file( file->filename,
"access", VIPS_ACCESS_SEQUENTIAL,
"page", (int) factor,