Use cairo_push_group() for all double buffering, drop window_copy_*()

clients/dnd.c

@@ -171,21 +171,20 @@ dnd_draw(struct dnd *dnd)
 {
 	struct rectangle allocation;
 	cairo_t *cr;
-	cairo_surface_t *wsurface, *surface;
+	cairo_surface_t *surface;
 	int i;
 
 	window_draw(dnd->window);
 
-	window_get_child_allocation(dnd->window, &allocation);
+	surface = window_get_surface(dnd->window);
-
-	wsurface = window_get_surface(dnd->window);
-	surface = cairo_surface_create_similar(wsurface,
-					       CAIRO_CONTENT_COLOR_ALPHA,
-					       allocation.width,
-					       allocation.height);
-	cairo_surface_destroy(wsurface);
-
 	cr = cairo_create(surface);
+	window_get_child_allocation(dnd->window, &allocation);
+	cairo_rectangle(cr, allocation.x, allocation.y,
+			allocation.width, allocation.height);
+	cairo_clip(cr);
+	cairo_push_group(cr);
+
+	cairo_translate(cr, allocation.x, allocation.y);
 	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 	cairo_set_source_rgba(cr, 0, 0, 0, 0.8);
 	cairo_paint(cr);
@@ -199,9 +198,9 @@ dnd_draw(struct dnd *dnd)
 		cairo_paint(cr);
 	}
 
+	cairo_pop_group_to_source(cr);
+	cairo_paint(cr);
 	cairo_destroy(cr);
-
-	window_copy_surface(dnd->window, &allocation, surface);
 	cairo_surface_destroy(surface);
 	window_flush(dnd->window);
 }

clients/image.c

@@ -140,7 +140,7 @@ image_draw(struct image *image)
 	struct rectangle allocation;
 	GdkPixbuf *pb;
 	cairo_t *cr;
-	cairo_surface_t *wsurface, *surface;
+	cairo_surface_t *surface;
 
 	window_draw(image->window);
 
@@ -153,14 +153,15 @@ image_draw(struct image *image)
 	if (pb == NULL)
 		return;
 
-	wsurface = window_get_surface(image->window);
+	surface = window_get_surface(image->window);
-	surface = cairo_surface_create_similar(wsurface,
-					       CAIRO_CONTENT_COLOR_ALPHA,
-					       allocation.width,
-					       allocation.height);
-
-	cairo_surface_destroy(wsurface);
 	cr = cairo_create(surface);
+	window_get_child_allocation(image->window, &allocation);
+	cairo_rectangle(cr, allocation.x, allocation.y,
+			allocation.width, allocation.height);
+	cairo_clip(cr);
+	cairo_push_group(cr);
+	cairo_translate(cr, allocation.x, allocation.y);
+
 	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 	cairo_set_source_rgba(cr, 0, 0, 0, 1);
 	cairo_paint(cr);
@@ -169,11 +170,13 @@ image_draw(struct image *image)
 			  allocation.width, allocation.height);
 	cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 	cairo_paint(cr);
-	cairo_destroy(cr);
 
 	g_object_unref(pb);
 
-	window_copy_surface(image->window, &allocation, surface);
+	cairo_pop_group_to_source(cr);
+	cairo_paint(cr);
+	cairo_destroy(cr);
+
 	window_flush(image->window);
 	cairo_surface_destroy(surface);
 }

clients/window.c

@@ -1102,30 +1102,6 @@ window_set_child_size(struct window *window, int32_t width, int32_t height)
 	}
 }
 
-void
-window_copy_image(struct window *window,
-		  struct rectangle *rectangle, EGLImageKHR image)
-{
-	/* set image as read buffer, copy pixels or something... */
-}
-
-void
-window_copy_surface(struct window *window,
-		    struct rectangle *rectangle,
-		    cairo_surface_t *surface)
-{
-	cairo_t *cr;
-
-	cr = cairo_create (window->cairo_surface);
-
-	cairo_set_source_surface (cr,
-				  surface,
-				  rectangle->x, rectangle->y);
-
-	cairo_paint (cr);
-	cairo_destroy (cr);
-}
-
 static gboolean
 idle_redraw(void *data)
 {

clients/window.h

@@ -141,10 +141,6 @@ window_get_child_allocation(struct window *window,
 void
 window_set_child_size(struct window *window, int32_t width, int32_t height);
 void
-window_copy_image(struct window *window,
-		  struct rectangle *rectangle,
-		  void *image);
-void
 window_schedule_redraw(struct window *window);
 
 void
@@ -154,11 +150,6 @@ window_damage(struct window *window, int32_t x, int32_t y,
 cairo_surface_t *
 window_get_surface(struct window *window);
 
-void
-window_copy_surface(struct window *window,
-		    struct rectangle *rectangle,
-		    cairo_surface_t *surface);
-
 void
 window_flush(struct window *window);