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allow non-square bounding boxes in vipsthumbnail

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thanks seth
This commit is contained in:
John Cupitt 2013-10-23 09:37:45 +01:00
parent 29a0c398aa
commit 8d270d49c4
3 changed files with 31 additions and 16 deletions
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1
ChangeLog
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@ -5,6 +5,7 @@
- add "interlace" option to vips_jpegsave()
- remove vips_image_copy_fields() and vips_demand_hint() and add
vips_image_pipeline() to do both jobs
- vipsthumbnail allows non-square bounding boxes, thanks seth
18/10/13 started 7.36.3
- fix compiler warnings in ubuntu 13.10

3
man/vipsthumbnail.1
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@ -40,7 +40,8 @@ Set the output thumbnail size to
.B N
x
.B N
pixels. The image is shrunk so that it just fits within this area, Images
pixels. You can use MxN to specify a rectangular bounding box.
The image is shrunk so that it just fits within this area, images
which are smaller than this are expanded.
.TP

43
tools/vipsthumbnail.c
View File

@ -53,7 +53,9 @@
#include <vips/vips.h>
static int thumbnail_size = 128;
static char *thumbnail_size = "128";
static int thumbnail_width = 128;
static int thumbnail_height = 128;
static char *output_format = "tn_%s.jpg";
static char *interpolator = "bilinear";
static char *export_profile = NULL;
@ -68,8 +70,8 @@ static gboolean nodelete_profile = FALSE;
static GOptionEntry options[] = {
{ "size", 's', 0,
G_OPTION_ARG_INT, &thumbnail_size,
N_( "set thumbnail size to SIZE" ),
G_OPTION_ARG_STRING, &thumbnail_size,
N_( "shrink to SIZE or to WIDTHxHEIGHT" ),
N_( "SIZE" ) },
{ "output", 'o', 0,
G_OPTION_ARG_STRING, &output_format,
@ -115,13 +117,14 @@ static GOptionEntry options[] = {
static int
calculate_shrink( int width, int height, double *residual )
{
/* We shrink to make the largest dimension equal to size.
/* Calculate the horizontal and vertical shrink we'd need to fit the
* image to the bounding box, and pick the biggest.
*/
int dimension = IM_MAX( width, height );
double horizontal = (double) width / thumbnail_width;
double vertical = (double) height / thumbnail_height;
double factor = VIPS_MAX( horizontal, vertical );
double factor = dimension / (double) thumbnail_size;
/* If the shrink factor is <=1.0, we need to zoom rather than shrink.
/* If the shrink factor is <= 1.0, we need to zoom rather than shrink.
* Just set the factor to 1 in this case.
*/
double factor2 = factor < 1.0 ? 1.0 : factor;
@ -130,14 +133,15 @@ calculate_shrink( int width, int height, double *residual )
*/
int shrink = floor( factor2 );
/* Size after int shrink.
*/
int isize = floor( dimension / shrink );
if( residual ) {
/* Width after int shrink.
*/
int iwidth = width / shrink;
/* Therefore residual scale factor is.
*/
if( residual )
*residual = thumbnail_size / (double) isize;
/* Therefore residual scale factor is.
*/
*residual = (width / factor) / iwidth;
}
return( shrink );
}
@ -555,6 +559,15 @@ main( int argc, char **argv )
g_option_context_free( context );
if( sscanf( thumbnail_size, "%d x %d",
&thumbnail_width, &thumbnail_height ) != 2 ) {
if( sscanf( thumbnail_size, "%d", &thumbnail_width ) != 1 )
vips_error_exit( "unable to parse size \"%s\" -- "
"use eg. 128 or 200x300", thumbnail_size );
thumbnail_height = thumbnail_width;
}
for( i = 1; i < argc; i++ ) {
/* Hang resources for this processing off this.
*/