[PATCH] desktop-shell: Fix black edges on scaled desktop pattern

Bill Spitzak spitzak at gmail.com
Fri May 9 13:51:06 PDT 2014


Filter sampling outside the source image can leak black into the edges of the
desktop image. This is most easily seen by scaling the default tiled image
with this weston.ini:

	# no background-image and no background-color
	background-type=scale-crop
---
 clients/desktop-shell.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/clients/desktop-shell.c b/clients/desktop-shell.c
index 4880888..e121cc7 100644
--- a/clients/desktop-shell.c
+++ b/clients/desktop-shell.c
@@ -724,6 +724,7 @@ background_draw(struct widget *widget, void *data)
 		case BACKGROUND_SCALE:
 			cairo_matrix_init_scale(&matrix, sx, sy);
 			cairo_pattern_set_matrix(pattern, &matrix);
+			cairo_pattern_set_extend(pattern, CAIRO_EXTEND_PAD);
 			break;
 		case BACKGROUND_SCALE_CROP:
 			s = (sx < sy) ? sx : sy;
@@ -733,6 +734,7 @@ background_draw(struct widget *widget, void *data)
 			cairo_matrix_init_translate(&matrix, tx, ty);
 			cairo_matrix_scale(&matrix, s, s);
 			cairo_pattern_set_matrix(pattern, &matrix);
+			cairo_pattern_set_extend(pattern, CAIRO_EXTEND_PAD);
 			break;
 		case BACKGROUND_TILE:
 			cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
-- 
1.7.9.5



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