Changeset 60198 in vbox for trunk/src/VBox/Additions/linux/drm

Timestamp:

Mar 26, 2016 2:43:03 PM (9 years ago)

Author:

vboxsync

Message:

bugref:8087: Additions/x11: support non-root X server: when running on older versions of VirtualBox certain things are not shown right unless we programme the graphics mode on the first screen via the VBE registers too. While this is not always possible due to limitations of the register model, at least do it when it is.

File:

• trunk/src/VBox/Additions/linux/drm/vbox_mode.c (modified) (1 diff)

trunk/src/VBox/Additions/linux/drm/vbox_mode.c

@@ -87 +87 @@
     pitch = crtc->enabled ? CRTC_FB(crtc)->pitches[0] : width * bpp / 8;
 #endif
-    /* if (vbox_crtc->crtc_id == 0 && crtc->enabled)
+    /* This is the old way of setting graphics modes.  It assumed one screen
+     * and a frame-buffer at the start of video RAM.  On older versions of
+     * VirtualBox, certain parts of the code still assume that the first
+     * screen is programmed this way, so try to fake it. */
+    if (   vbox_crtc->crtc_id == 0
+        && crtc->enabled
+        && vbox_crtc->fb_offset / pitch < 0xffff - crtc->y
+        && vbox_crtc->fb_offset % (bpp / 8) == 0)
         VBoxVideoSetModeRegisters(width, height, pitch * 8 / bpp,
-                                  CRTC_FB(crtc)->bits_per_pixel, 0,
-                                  crtc->x, crtc->y); */
+                          CRTC_FB(crtc)->bits_per_pixel, 0,
+                          vbox_crtc->fb_offset % pitch / bpp * 8 + crtc->x,
+                          vbox_crtc->fb_offset / pitch + crtc->y);
     flags = VBVA_SCREEN_F_ACTIVE;
     flags |= (crtc->enabled && !vbox_crtc->blanked ? 0 : VBVA_SCREEN_F_BLANK);