Correctly tell cairo about CPU buffer access

We need to tell cairo to flush buffers before starting CPU access and
afterwards mark it dirty. This is unlikely to be needed on mem-buffers,
but we cannot rely on it so do it.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/wlt_render.c b/src/wlt_render.c
index 4702e1c..819b807 100644
--- a/src/wlt_render.c
+++ b/src/wlt_render.c
@@ -289,9 +289,10 @@ void wlt_renderer_draw(const struct wlt_draw_ctx *ctx)
 	 * cairo to blit it into the gtk buffer. This way we get two mem-writes
 	 * but at least it's fast enough to render a whole screen. */
 
+	cairo_surface_flush(rend->surface);
 	tsm_screen_draw(ctx->screen, wlt_renderer_draw_cell, (void*)ctx);
+	cairo_surface_mark_dirty(rend->surface);
 
-	/* TODO: mark surface as dirty so cairo notices that */
 	cairo_set_source_surface(ctx->cr, rend->surface, 0, 0);
 	cairo_paint(ctx->cr);
 }