sergiotarxz/libvips
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start work on toilet-roll thumbnails again

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This commit is contained in:
John Cupitt 2019-03-02 22:13:55 +00:00
parent 15ee957ea9
commit 29d33b2753
2 changed files with 3 additions and 4 deletions
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1
libvips/iofuncs/header.c
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@ -783,7 +783,6 @@ vips_image_get_offset( const VipsImage *image )
* @image: image to get from * @image: image to get from
* *
* Multi-page images can have a page height. Fetch it, and sanity check it. * Multi-page images can have a page height. Fetch it, and sanity check it.
* convolution.
* *
* Returns: the page height. * Returns: the page height.
*/ */

6
libvips/resample/thumbnail.c
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@ -188,10 +188,10 @@ vips_thumbnail_read_header( VipsThumbnail *thumbnail, VipsImage *image )
thumbnail->input_height = image->Ysize; thumbnail->input_height = image->Ysize;
thumbnail->angle = vips_autorot_get_angle( image ); thumbnail->angle = vips_autorot_get_angle( image );
if( vips_image_get_typeof( image, "n-pages" ) ) { if( vips_image_get_typeof( image, VIPS_META_N_PAGES ) ) {
int n_pages; int n_pages;
if( !vips_image_get_int( image, "n-pages", &n_pages ) ) if( !vips_image_get_int( image, VIPS_META_N_PAGES, &n_pages ) )
thumbnail->n_pages = thumbnail->n_pages =
VIPS_CLIP( 1, n_pages, MAX_LEVELS ); VIPS_CLIP( 1, n_pages, MAX_LEVELS );
} }
@ -355,7 +355,7 @@ vips_thumbnail_calculate_shrink( VipsThumbnail *thumbnail,
} }
/* In toilet-roll mode, we must adjust vshrink so that we exactly hit /* In toilet-roll mode, we must adjust vshrink so that we exactly hit
* page_height, or we'll have pixels straddling pixel boundaries. * page_height or we'll have pixels straddling pixel boundaries.
*/ */
if( thumbnail->n_pages > 1 ) { if( thumbnail->n_pages > 1 ) {
int target_page_height = VIPS_RINT( input_height / *vshrink ); int target_page_height = VIPS_RINT( input_height / *vshrink );