swap abs() for fabs() in composite

The non-vector fallback path had abs(double). Thanks brcarp. See #1572
libvips · Mar 11, 2020 · 73c1331 · 73c1331
1 parent 03399b4
commit 73c1331
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/libvips/conversion/composite.cpp b/libvips/conversion/composite.cpp
@@ -621,7 +621,7 @@ vips_composite_base_blend( VipsCompositeBase *composite,
 
 		case VIPS_BLEND_MODE_DIFFERENCE:
 			for( int b = 0; b < bands; b++ ) 
-				f[b] = abs( B[b] - A[b] );
+				f[b] = fabs( B[b] - A[b] );
 			break;
 
 		case VIPS_BLEND_MODE_EXCLUSION: