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remove stop-at-solid feature 

We used to stop compositing when we reached the first solid image, but
that only works for modes like OVER.

Instead, composite all images, regardless of transparency.

See https://github.com/libvips/libvips/issues/928
This commit is contained in:
John Cupitt 2018-11-27 14:51:56 +00:00
parent 24abbb83ab
commit e6f271df10
1 changed files with 30 additions and 37 deletions
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67
libvips/conversion/composite.cpp
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@ -9,6 +9,8 @@
* - allow one mode ... reused for all joins
* 11/8/18 [medakk]
* - x/y params let you position images
* 27/11/18
* - don't stop on first non-transparent image [felixbuenemann]
*/
/*
@ -105,11 +107,6 @@ typedef struct _VipsCompositeBase {
int *x_offset;
int *y_offset;
/* The number of inputs. This can be less than the number of images in
* @in.
*/
int n;
/* The number of non-alpha bands we are blending.
*/
int bands;
@ -312,7 +309,7 @@ vips_composite_base_max_band( VipsCompositeBase *composite, double *max_band )
break;
case VIPS_INTERPRETATION_B_W:
max_band[0] = 256;
max_band[0] = 255;
break;
default:
@ -793,7 +790,7 @@ vips_combine_pixels( VipsCompositeBase *composite, VipsPel *q, VipsPel **p )
{
VipsBlendMode *mode = (VipsBlendMode *) composite->mode->area.data;
int n_mode = composite->mode->area.n;
int n = composite->n;
int n = composite->in->area.n;
int bands = composite->bands;
T * restrict tq = (T * restrict) q;
T ** restrict tp = (T ** restrict) p;
@ -856,7 +853,7 @@ vips_combine_pixels3( VipsCompositeBase *composite, VipsPel *q, VipsPel **p )
{
VipsBlendMode *mode = (VipsBlendMode *) composite->mode->area.data;
int n_mode = composite->mode->area.n;
int n = composite->n;
int n = composite->in->area.n;
T * restrict tq = (T * restrict) q;
T ** restrict tp = (T ** restrict) p;
@ -924,6 +921,7 @@ vips_composite_base_gen( VipsRegion *output_region,
VipsCompositeBase *composite = (VipsCompositeBase *) b;
VipsRect *r = &output_region->valid;
int ps = VIPS_IMAGE_SIZEOF_PEL( output_region->im );
int n = composite->in->area.n;
if( vips_reorder_prepare_many( output_region->im, seq->ir, r ) )
return( -1 );
@ -933,10 +931,10 @@ vips_composite_base_gen( VipsRegion *output_region,
for( int y = 0; y < r->height; y++ ) {
VipsPel *q;
for( int i = 0; i < composite->n; i++ )
for( int i = 0; i < n; i++ )
seq->p[i] = VIPS_REGION_ADDR( seq->ir[i],
r->left, r->top + y );
seq->p[composite->n] = NULL;
seq->p[n] = NULL;
q = VIPS_REGION_ADDR( output_region, r->left, r->top + y );
for( int x = 0; x < r->width; x++ ) {
@ -1015,7 +1013,7 @@ vips_composite_base_gen( VipsRegion *output_region,
return( -1 );
}
for( int i = 0; i < composite->n; i++ )
for( int i = 0; i < n; i++ )
seq->p[i] += ps;
q += ps;
}
@ -1033,27 +1031,28 @@ vips_composite_base_build( VipsObject *object )
VipsConversion *conversion = VIPS_CONVERSION( object );
VipsCompositeBase *composite = (VipsCompositeBase *) object;
int n;
VipsBlendMode *mode;
VipsImage **in;
VipsImage **decode;
VipsImage **compositing;
VipsImage **format;
VipsImage **size;
VipsBlendMode *mode;
if( VIPS_OBJECT_CLASS( vips_composite_base_parent_class )->
build( object ) )
return( -1 );
composite->n = composite->in->area.n;
n = composite->in->area.n;
if( composite->n <= 0 ) {
if( n <= 0 ) {
vips_error( klass->nickname, "%s", _( "no input images" ) );
return( -1 );
}
if( composite->mode->area.n != composite->n - 1 &&
if( composite->mode->area.n != n - 1 &&
composite->mode->area.n != 1 ) {
vips_error( klass->nickname, _( "must be 1 or %d blend modes" ),
composite->n - 1 );
n - 1 );
return( -1 );
}
mode = (VipsBlendMode *) composite->mode->area.data;
@ -1069,16 +1068,15 @@ vips_composite_base_build( VipsObject *object )
in = (VipsImage **) composite->in->area.data;
decode = (VipsImage **) vips_object_local_array( object, composite->n );
for( int i = 0; i < composite->n; i++ )
decode = (VipsImage **) vips_object_local_array( object, n );
for( int i = 0; i < n; i++ )
if( vips_image_decode( in[i], &decode[i] ) )
return( -1 );
in = decode;
/* Are any of the images missing an alpha? The first missing alpha is
* given a solid 255 and becomes the background image, shortening n.
/* Add a solid alpha to any images missing one.
*/
for( int i = composite->n - 1; i >= 0; i-- )
for( int i = n - 1; i >= 0; i-- )
if( !vips_image_hasalpha( in[i] ) ) {
VipsImage *x;
@ -1086,11 +1084,6 @@ vips_composite_base_build( VipsObject *object )
return( -1 );
g_object_unref( in[i] );
in[i] = x;
composite->n -= i;
in += i;
break;
}
/* Transform to compositing space. It defaults to sRGB or B_W, usually
@ -1101,14 +1094,14 @@ vips_composite_base_build( VipsObject *object )
gboolean any_16;
all_grey = TRUE;
for( int i = 0; i < composite->n; i++ )
for( int i = 0; i < n; i++ )
if( in[i]->Bands > 2 ) {
all_grey = FALSE;
break;
}
any_16 = FALSE;
for( int i = 0; i < composite->n; i++ )
for( int i = 0; i < n; i++ )
if( in[i]->Type == VIPS_INTERPRETATION_GREY16 ||
in[i]->Type == VIPS_INTERPRETATION_RGB16 ) {
any_16 = TRUE;
@ -1125,8 +1118,8 @@ vips_composite_base_build( VipsObject *object )
}
compositing = (VipsImage **)
vips_object_local_array( object, composite->n );
for( int i = 0; i < composite->n; i++ )
vips_object_local_array( object, n );
for( int i = 0; i < n; i++ )
if( vips_colourspace( in[i], &compositing[i],
composite->compositing_space, (void *) NULL ) )
return( -1 );
@ -1135,7 +1128,7 @@ vips_composite_base_build( VipsObject *object )
/* Check that they all now match in bands. This can fail for some
* input combinations.
*/
for( int i = 1; i < composite->n; i++ )
for( int i = 1; i < n; i++ )
if( in[i]->Bands != in[0]->Bands ) {
vips_error( klass->nickname,
"%s", _( "images do not have same "
@ -1170,8 +1163,8 @@ vips_composite_base_build( VipsObject *object )
/* Transform the input images to match format. We may have
* mixed float and double, for example.
*/
format = (VipsImage **) vips_object_local_array( object, composite->n );
if( vips__formatalike_vec( in, format, composite->n ) )
format = (VipsImage **) vips_object_local_array( object, n );
if( vips__formatalike_vec( in, format, n ) )
return( -1 );
in = format;
@ -1182,14 +1175,14 @@ vips_composite_base_build( VipsObject *object )
int width = vips_image_get_width( in[0] );
int height = vips_image_get_height( in[0] );
VipsImage **position = (VipsImage **)
vips_object_local_array( object, composite->n );
vips_object_local_array( object, n );
/* The zero image does not move.
*/
g_object_ref( in[0] );
position[0] = in[0];
for( int i = 1; i < composite->n; i++ )
for( int i = 1; i < n; i++ )
if( vips_embed( in[i], &position[i],
composite->x_offset[i - 1],
composite->y_offset[i - 1],
@ -1202,8 +1195,8 @@ vips_composite_base_build( VipsObject *object )
/* Transform the input images to match in size. They can be mismatched
* if there was no supplied x/y.
*/
size = (VipsImage **) vips_object_local_array( object, composite->n );
if( vips__sizealike_vec( in, size, composite->n ) )
size = (VipsImage **) vips_object_local_array( object, n );
if( vips__sizealike_vec( in, size, n ) )
return( -1 );
in = size;