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better thumbnail behaviour for subifd pyramids

This commit is contained in:
John Cupitt 2020-06-02 14:23:14 +01:00
parent cff84f4606
commit d74fe71764
2 changed files with 23 additions and 16 deletions
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6
libvips/foreign/tiff2vips.c
View File

@ -2624,7 +2624,8 @@ static int
rtiff_header_read_all( Rtiff *rtiff )
{
#ifdef DEBUG
printf( "tiff2vips: reading header for page %d ...\n", rtiff->page );
printf( "rtiff_header_read_all: "
"reading header for page %d ...\n", rtiff->page );
#endif /*DEBUG*/
if( rtiff_set_page( rtiff, rtiff->page ) ||
@ -2646,7 +2647,8 @@ rtiff_header_read_all( Rtiff *rtiff )
RtiffHeader header;
#ifdef DEBUG
printf( "tiff2vips: verifying header for page %d ...\n",
printf( "rtiff_header_read_all: "
"verifying header for page %d ...\n",
rtiff->page + i );
#endif /*DEBUG*/

33
libvips/resample/thumbnail.c
View File

@ -247,7 +247,7 @@ vips_thumbnail_read_header( VipsThumbnail *thumbnail, VipsImage *image )
*
* This may not be a pyr tiff, so no error if we can't find the layers.
*/
static gboolean
static void
vips_thumbnail_get_tiff_pyramid_page( VipsThumbnail *thumbnail )
{
VipsThumbnailClass *class = VIPS_THUMBNAIL_GET_CLASS( thumbnail );
@ -257,6 +257,10 @@ 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.
*/
thumbnail->subifd_pyramid = FALSE;
for( i = 0; i < thumbnail->n_pages; i++ ) {
VipsImage *page;
int level_width;
@ -265,7 +269,7 @@ vips_thumbnail_get_tiff_pyramid_page( VipsThumbnail *thumbnail )
int expected_level_height;
if( !(page = class->open( thumbnail, i )) )
return( FALSE );
return;
level_width = page->Xsize;
level_height = page->Ysize;
VIPS_UNREF( page );
@ -277,10 +281,10 @@ vips_thumbnail_get_tiff_pyramid_page( VipsThumbnail *thumbnail )
*/
if( abs( level_width - expected_level_width ) > 5 ||
level_width < 2 )
return( FALSE );
return;
if( abs( level_height - expected_level_height ) > 5 ||
level_height < 2 )
return( FALSE );
return;
thumbnail->level_width[i] = level_width;
thumbnail->level_height[i] = level_height;
@ -294,15 +298,13 @@ vips_thumbnail_get_tiff_pyramid_page( VipsThumbnail *thumbnail )
thumbnail->n_pages );
#endif /*DEBUG*/
thumbnail->level_count = thumbnail->n_pages;
return( thumbnail->n_pages > 1 );
}
/* Detect a TIFF pyramid made of subifds following a roughly /2 shrink.
*
* This may not be a pyr tiff, so no error if we can't find the layers.
*/
static gboolean
static void
vips_thumbnail_get_tiff_pyramid_subifd( VipsThumbnail *thumbnail )
{
VipsThumbnailClass *class = VIPS_THUMBNAIL_GET_CLASS( thumbnail );
@ -324,7 +326,7 @@ vips_thumbnail_get_tiff_pyramid_subifd( VipsThumbnail *thumbnail )
int expected_level_height;
if( !(page = class->open( thumbnail, i )) )
return( FALSE );
return;
level_width = page->Xsize;
level_height = page->Ysize;
VIPS_UNREF( page );
@ -338,10 +340,10 @@ vips_thumbnail_get_tiff_pyramid_subifd( VipsThumbnail *thumbnail )
*/
if( abs( level_width - expected_level_width ) > 5 ||
level_width < 2 )
return( FALSE );
return;
if( abs( level_height - expected_level_height ) > 5 ||
level_height < 2 )
return( FALSE );
return;
thumbnail->level_width[i] = level_width;
thumbnail->level_height[i] = level_height;
@ -355,8 +357,6 @@ vips_thumbnail_get_tiff_pyramid_subifd( VipsThumbnail *thumbnail )
thumbnail->n_pages );
#endif /*DEBUG*/
thumbnail->level_count = thumbnail->n_pages;
return( TRUE );
}
static int
@ -540,8 +540,13 @@ vips_thumbnail_open( VipsThumbnail *thumbnail )
* pyramids.
*/
if( vips_isprefix( "VipsForeignLoadTiff", thumbnail->loader ) ) {
if( !vips_thumbnail_get_tiff_pyramid_page( thumbnail ) )
vips_thumbnail_get_tiff_pyramid_subifd( thumbnail );
/* Test for a subifd pyr first, since we can do that from just
* one page.
*/
vips_thumbnail_get_tiff_pyramid_subifd( thumbnail );
if( thumbnail->level_count == 0 )
vips_thumbnail_get_tiff_pyramid_page( thumbnail );
}
/* For heif, we need to fetch the thumbnail size, in case we can use