modesetting: Clear new screen pixmap storage on RandR resize

Fixes random garbage being visible intermittently.

Reviewed-by: Adam Jackson <ajax@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.c b/hw/xfree86/drivers/modesetting/drmmode_display.c
index 5f9e78662..8a9dc2d80 100644
--- a/hw/xfree86/drivers/modesetting/drmmode_display.c
+++ b/hw/xfree86/drivers/modesetting/drmmode_display.c
@@ -1799,6 +1799,19 @@ drmmode_set_scanout_pixmap(xf86CrtcPtr crtc, PixmapPtr ppix)
                                              &drmmode_crtc->prime_pixmap);
 }
 
+static void
+drmmode_clear_pixmap(PixmapPtr pixmap)
+{
+    ScreenPtr screen = pixmap->drawable.pScreen;
+    GCPtr gc;
+
+    gc = GetScratchGC(pixmap->drawable.depth, screen);
+    if (gc) {
+        miClearDrawable(&pixmap->drawable, gc);
+        FreeScratchGC(gc);
+    }
+}
+
 static void *
 drmmode_shadow_allocate(xf86CrtcPtr crtc, int width, int height)
 {
@@ -3190,6 +3203,8 @@ drmmode_xf86crtc_resize(ScrnInfoPtr scrn, int width, int height)
     if (!drmmode_glamor_handle_new_screen_pixmap(drmmode))
         goto fail;
 
+    drmmode_clear_pixmap(ppix);
+
     for (i = 0; i < xf86_config->num_crtc; i++) {
         xf86CrtcPtr crtc = xf86_config->crtc[i];