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allow gaussblur sigma 0 

meaning no blur (obviosuly)
This commit is contained in:
John Cupitt 2020-09-21 09:45:08 +01:00
parent 10bada0161
commit 54144a8bc5
2 changed files with 27 additions and 13 deletions
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1
ChangeLog
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@ -6,6 +6,7 @@
- bump minimum libheif version to 1.3 [lovell]
- dzsave in iiif mode could set info.json dimensions off by one [Linden6]
- pdfload allows dpi and scale to both be set [le0daniel]
- allow gaussblur sigma zero, meaning no blur
9/8/20 started 8.10.1
- fix markdown -> xml conversion in doc generation

39
libvips/convolution/gaussblur.c
View File

@ -4,6 +4,9 @@
* - from vips_sharpen()
* 19/11/14
* - change parameters to be more imagemagick-like
* 21/9/20
* - allow sigma zero, meaning no blur
* - sigma < 0.2 is just copy
*/
/*
@ -73,23 +76,33 @@ vips_gaussblur_build( VipsObject *object )
if( VIPS_OBJECT_CLASS( vips_gaussblur_parent_class )->build( object ) )
return( -1 );
if( vips_gaussmat( &t[0], gaussblur->sigma, gaussblur->min_ampl,
"separable", TRUE,
"precision", gaussblur->precision,
NULL ) )
return( -1 );
/* vips_gaussmat() will make a 1x1 pixel mask for anything smaller than
* this.
*/
if( sigma < 0.2 ) {
if( vips_copy( gaussblur->in, &t[1], NULL ) )
return( -1 );
}
else {
if( vips_gaussmat( &t[0],
gaussblur->sigma, gaussblur->min_ampl,
"separable", TRUE,
"precision", gaussblur->precision,
NULL ) )
return( -1 );
#ifdef DEBUG
printf( "gaussblur: blurring with:\n" );
vips_matrixprint( t[0], NULL );
printf( "gaussblur: blurring with:\n" );
vips_matrixprint( t[0], NULL );
#endif /*DEBUG*/
g_info( "gaussblur mask width %d", t[0]->Xsize );
g_info( "gaussblur mask width %d", t[0]->Xsize );
if( vips_convsep( gaussblur->in, &t[1], t[0],
"precision", gaussblur->precision,
NULL ) )
return( -1 );
if( vips_convsep( gaussblur->in, &t[1], t[0],
"precision", gaussblur->precision,
NULL ) )
return( -1 );
}
g_object_set( object, "out", vips_image_new(), NULL );
@ -132,7 +145,7 @@ vips_gaussblur_class_init( VipsGaussblurClass *class )
_( "Sigma of Gaussian" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsGaussblur, sigma ),
0.01, 1000, 1.5 );
0.0, 1000, 1.5 );
VIPS_ARG_DOUBLE( class, "min_ampl", 3,
_( "Minimum amplitude" ),