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use vips_embed to position images

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This commit is contained in:
Karthik Karanth 2018-04-09 12:57:21 +05:30
parent e406015fe8
commit d06f420763
1 changed files with 23 additions and 10 deletions
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33
libvips/conversion/composite.cpp
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@ -933,21 +933,13 @@ vips_composite_base_gen( VipsRegion *output_region,
VIPS_GATE_START( "vips_composite_base_gen: work" );
// printf("r: %d %d\n", r->width, r->height);
// printf("seq0: %d %d\n", seq->ir[0]->valid.width, seq->ir[0]->valid.height);
// printf("seq1: %d %d\n", seq->ir[1]->valid.width, seq->ir[1]->valid.height);
// printf("seq2: %d %d\n", seq->ir[2]->valid.width, seq->ir[2]->valid.height);
for( int y = 0; y < r->height; y++ ) {
VipsPel *q;
int *x_offsets = (int *) composite->x->area.data;
int *y_offsets = (int *) composite->y->area.data;
for( int i = 0; i < composite->n; i++ ) {
for( int i = 0; i < composite->n; i++ )
seq->p[i] = VIPS_REGION_ADDR( seq->ir[i],
r->left, r->top + y );
}
seq->p[composite->n] = NULL;
q = VIPS_REGION_ADDR( output_region, r->left, r->top + y );
@ -1097,6 +1089,27 @@ vips_composite_base_build( VipsObject *object )
in = (VipsImage **) composite->in->area.data;
if( vips_object_argument_isset( object, "x" ) && vips_object_argument_isset( object, "y" ) ) {
int width, height;
//TODO: How to ensure that these two lines do not fail?
width = vips_image_get_width( in[0] );
height = vips_image_get_height( in[0] );
int *x_offsets = (int *) composite->x->area.data;
int *y_offsets = (int *) composite->y->area.data;
for( int i = 1; i < composite->n; i++ ) {
VipsImage *e;
if( vips_embed( in[i], &e, x_offsets[i - 1], y_offsets[i - 1], width, height, NULL ) )
return( -1 );
g_object_unref( in[i] );
in[i] = e;
}
}
decode = (VipsImage **) vips_object_local_array( object, composite->n );
for( int i = 0; i < composite->n; i++ )
if( vips_image_decode( in[i], &decode[i] ) )