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fix thumbnail of multi-page TIFF (again) 

The addition of subifd handling broke multipage tiff thumbnailing.

See https://github.com/libvips/pyvips/issues/192
This commit is contained in:
John Cupitt 2020-06-15 13:13:21 +01:00
parent 1ff9800958
commit 023f4ca41b
1 changed files with 28 additions and 14 deletions
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42
libvips/resample/thumbnail.c
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@ -259,11 +259,15 @@ vips_thumbnail_get_tiff_pyramid_page( VipsThumbnail *thumbnail )
printf( "vips_thumbnail_get_tiff_pyramid_page:\n" );
#endif /*DEBUG*/
/* Tell open() that we want to open pages rather than subifds.
/* Single-page docs can't be pyramids.
*/
thumbnail->subifd_pyramid = FALSE;
if( thumbnail->n_loaded_pages < 2 )
return;
for( i = 0; i < thumbnail->n_pages; i++ ) {
/* 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++ ) {
VipsImage *page;
int level_width;
int level_height;
@ -297,9 +301,9 @@ vips_thumbnail_get_tiff_pyramid_page( VipsThumbnail *thumbnail )
#ifdef DEBUG
printf( "vips_thumbnail_get_tiff_pyramid_page: "
"%d layer pyramid detected\n",
thumbnail->n_pages );
thumbnail->n_loaded_pages );
#endif /*DEBUG*/
thumbnail->level_count = thumbnail->n_pages;
thumbnail->level_count = thumbnail->n_loaded_pages;
}
/* Detect a TIFF pyramid made of subifds following a roughly /2 shrink.
@ -316,10 +320,6 @@ vips_thumbnail_get_tiff_pyramid_subifd( VipsThumbnail *thumbnail )
printf( "vips_thumbnail_get_tiff_pyramid_subifd:\n" );
#endif /*DEBUG*/
/* Tell open() that we want to open subifds rather than pages.
*/
thumbnail->subifd_pyramid = TRUE;
for( i = 0; i < thumbnail->n_subifds; i++ ) {
VipsImage *page;
int level_width;
@ -544,10 +544,13 @@ vips_thumbnail_open( VipsThumbnail *thumbnail )
/* Test for a subifd pyr first, since we can do that from just
* one page.
*/
thumbnail->subifd_pyramid = TRUE;
vips_thumbnail_get_tiff_pyramid_subifd( thumbnail );
if( thumbnail->level_count == 0 )
if( thumbnail->level_count == 0 ) {
thumbnail->subifd_pyramid = FALSE;
vips_thumbnail_get_tiff_pyramid_page( thumbnail );
}
}
/* For heif, we need to fetch the thumbnail size, in case we can use
@ -567,9 +570,12 @@ vips_thumbnail_open( VipsThumbnail *thumbnail )
thumbnail->input_width, thumbnail->input_height );
else if( vips_isprefix( "VipsForeignLoadTiff", thumbnail->loader ) ||
vips_isprefix( "VipsForeignLoadOpenslide",
thumbnail->loader ) )
factor = vips_thumbnail_find_pyrlevel( thumbnail,
thumbnail->input_width, thumbnail->input_height );
thumbnail->loader ) ) {
if( thumbnail->level_count > 0 )
factor = vips_thumbnail_find_pyrlevel( thumbnail,
thumbnail->input_width,
thumbnail->input_height );
}
else if( vips_isprefix( "VipsForeignLoadPdf", thumbnail->loader ) ||
vips_isprefix( "VipsForeignLoadWebp", thumbnail->loader ) ||
vips_isprefix( "VipsForeignLoadSvg", thumbnail->loader ) )
@ -1043,16 +1049,24 @@ vips_thumbnail_file_open( VipsThumbnail *thumbnail, double factor )
NULL ) );
}
else if( vips_isprefix( "VipsForeignLoadTiff", thumbnail->loader ) ) {
/* We support three modes: subifd pyramids, page-based
* pyramids, and simple multi-page TIFFs (no pyramid).
*/
if( thumbnail->subifd_pyramid )
return( vips_image_new_from_file( file->filename,
"access", VIPS_ACCESS_SEQUENTIAL,
"subifd", (int) factor,
NULL ) );
else
else if( thumbnail->level_count > 0 )
return( vips_image_new_from_file( file->filename,
"access", VIPS_ACCESS_SEQUENTIAL,
"page", (int) factor,
NULL ) );
else
return( vips_image_new_from_file( file->filename,
"access", VIPS_ACCESS_SEQUENTIAL,
NULL ) );
}
else if( vips_isprefix( "VipsForeignLoadHeif", thumbnail->loader ) ) {
return( vips_image_new_from_file( file->filename,