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add pyr tiff shrink-on-load for thumbnail

This commit is contained in:
John Cupitt 2018-11-16 18:00:25 +00:00
parent 26d0e312c6
commit 6b9d89b103
2 changed files with 90 additions and 5 deletions
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1
ChangeLog
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@ -6,6 +6,7 @@
- implement thumbnail shrink-on-load for openslide images [jcupitt]
- revise vips_cast() to improve behaviour with uint images [erdmann]
- add bandand()/or()/eor() to cplusplus binding [clcaalu]
- implement shrink-on-load for tiff pyramids [jcupitt]
23/9/18 started 8.7.1
- update function list in docs [janko-m]

94
libvips/resample/thumbnail.c
View File

@ -14,6 +14,8 @@
* 31/10/18
* - deprecate auto_rotate, add no_rotate
* - implement shrink-on-load for openslide images
* 16/11/18
* - implement shrink-on-load for tiff pyramid
*/
/*
@ -107,6 +109,10 @@ typedef struct _VipsThumbnail {
int level_width[MAX_LEVELS];
int level_height[MAX_LEVELS];
/* Try to get n-pages too, for pyr tiff load.
*/
int n_pages;
} VipsThumbnail;
typedef struct _VipsThumbnailClass {
@ -174,6 +180,14 @@ vips_thumbnail_read_header( VipsThumbnail *thumbnail, VipsImage *image )
thumbnail->input_height = image->Ysize;
thumbnail->angle = vips_autorot_get_angle( image );
if( vips_image_get_typeof( image, "n-pages" ) ) {
int n_pages;
if( !vips_image_get_int( image, "n-pages", &n_pages ) )
thumbnail->n_pages =
VIPS_CLIP( 1, n_pages, MAX_LEVELS );
}
/* For openslide, read out the level structure too.
*/
if( vips_isprefix( "VipsForeignLoadOpenslide", thumbnail->loader ) ) {
@ -199,6 +213,55 @@ 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 void
vips_thumbnail_get_tiff_pyramid( VipsThumbnail *thumbnail )
{
VipsThumbnailClass *class = VIPS_THUMBNAIL_GET_CLASS( thumbnail );
int i;
for( i = 0; i < thumbnail->n_pages; i++ ) {
VipsImage *page;
int level_width;
int level_height;
int expected_level_width;
int expected_level_height;
if( !(page = class->open( thumbnail, i )) )
return;
level_width = page->Xsize;
level_height = page->Ysize;
VIPS_UNREF( page );
/* Try to sanity-check the size of the pages. Do they look
* like a pyramid?
*/
expected_level_width = thumbnail->input_width / (1 << i);
expected_level_height = thumbnail->input_height / (1 << i);
/* Won't be exact due to rounding etc.
*/
if( abs( level_width - expected_level_width ) > 5 ||
level_width < 2 )
return;
if( abs( level_height - expected_level_height ) > 5 ||
level_height < 2 )
return;
thumbnail->level_width[i] = level_width;
thumbnail->level_height[i] = level_height;
}
/* Now set level_count. This signals that we've found a pyramid.
*/
#ifdef DEBUG
printf( "vips_thumbnail_get_tiff_pyramid: %d layer pyramid detected\n",
thumbnail->n_pages );
#endif /*DEBUG*/
thumbnail->level_count = thumbnail->n_pages;
}
/* Calculate the shrink factor, taking into account auto-rotate, the fit mode,
* and so on.
*
@ -313,7 +376,7 @@ vips_thumbnail_find_jpegshrink( VipsThumbnail *thumbnail,
/* Find the best openslide level.
*/
static int
vips_thumbnail_find_openslidelevel( VipsThumbnail *thumbnail,
vips_thumbnail_find_pyrlevel( VipsThumbnail *thumbnail,
int width, int height )
{
int level;
@ -349,6 +412,12 @@ vips_thumbnail_open( VipsThumbnail *thumbnail )
g_info( "input size is %d x %d",
thumbnail->input_width, thumbnail->input_height );
/* For tiff, we need to make a separate get_info() for each page to
* get all the pyramid levels.
*/
if( vips_isprefix( "VipsForeignLoadTiff", thumbnail->loader ) )
vips_thumbnail_get_tiff_pyramid( thumbnail );
factor = 1.0;
if( vips_isprefix( "VipsForeignLoadJpeg", thumbnail->loader ) ) {
@ -357,12 +426,12 @@ vips_thumbnail_open( VipsThumbnail *thumbnail )
g_info( "loading jpeg with factor %g pre-shrink", factor );
}
else if( vips_isprefix( "VipsForeignLoadOpenslide",
thumbnail->loader ) ) {
factor = vips_thumbnail_find_openslidelevel( thumbnail,
else if( vips_isprefix( "VipsForeignLoadTiff", thumbnail->loader ) ||
vips_isprefix( "VipsForeignLoadOpenslide", thumbnail->loader ) ) {
factor = vips_thumbnail_find_pyrlevel( thumbnail,
thumbnail->input_width, thumbnail->input_height );
g_info( "loading openslide level %g", factor );
g_info( "loading pyr level %g", factor );
}
else if( vips_isprefix( "VipsForeignLoadPdf", thumbnail->loader ) ||
vips_isprefix( "VipsForeignLoadSvg", thumbnail->loader ) ) {
@ -385,6 +454,8 @@ vips_thumbnail_open( VipsThumbnail *thumbnail )
if( !(im = class->open( thumbnail, factor )) )
return( NULL );
g_info( "pre-shrunk size is %d x %d", im->Xsize, im->Ysize );
return( im );
}
@ -787,6 +858,12 @@ vips_thumbnail_file_open( VipsThumbnail *thumbnail, double factor )
"scale", factor,
NULL ) );
}
else if( vips_isprefix( "VipsForeignLoadTiff", thumbnail->loader ) ) {
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,
@ -968,6 +1045,13 @@ vips_thumbnail_buffer_open( VipsThumbnail *thumbnail, double factor )
"scale", factor,
NULL ) );
}
else if( vips_isprefix( "VipsForeignLoadTiff", thumbnail->loader ) ) {
return( vips_image_new_from_buffer(
buffer->buf->data, buffer->buf->length, "",
"access", VIPS_ACCESS_SEQUENTIAL,
"page", (int) factor,
NULL ) );
}
else {
return( vips_image_new_from_buffer(
buffer->buf->data, buffer->buf->length, "",