winex11: Don't use ColorShifts for non-TrueColor bitmaps.

dlls/winex11.drv/bitmap.c

@@ -102,6 +102,7 @@ HBITMAP CDECL X11DRV_SelectBitmap( X11DRV_PDEVICE *physDev, HBITMAP hbitmap )
 
     physDev->bitmap = physBitmap;
     physDev->drawable = physBitmap->pixmap;
+    physDev->color_shifts = physBitmap->trueColor ? &physBitmap->pixmap_color_shifts : NULL;
     SetRect( &physDev->drawable_rect, 0, 0, bitmap.bmWidth, bitmap.bmHeight );
     physDev->dc_rect = physDev->drawable_rect;
 
@@ -119,11 +120,6 @@ HBITMAP CDECL X11DRV_SelectBitmap( X11DRV_PDEVICE *physDev, HBITMAP hbitmap )
         wine_tsx11_unlock();
     }
 
-    if(physDev->depth == 1)
-        physDev->color_shifts = NULL;
-    else
-        physDev->color_shifts = &physBitmap->pixmap_color_shifts;
-
     return hbitmap;
 }
 
@@ -167,11 +163,13 @@ BOOL CDECL X11DRV_CreateBitmap( X11DRV_PDEVICE *physDev, HBITMAP hbitmap, LPVOID
     if(bitmap.bmBitsPixel == 1)
     {
         physBitmap->pixmap_depth = 1;
+        physBitmap->trueColor = FALSE;
     }
     else
     {
         physBitmap->pixmap_depth = screen_depth;
         physBitmap->pixmap_color_shifts = X11DRV_PALETTE_default_shifts;
+        physBitmap->trueColor = (visual->class == TrueColor || visual->class == DirectColor);
     }
     physBitmap->pixmap = XCreatePixmap(gdi_display, root_window,
                                        bitmap.bmWidth, bitmap.bmHeight, physBitmap->pixmap_depth);

dlls/winex11.drv/dib.c

@@ -4749,11 +4749,13 @@ HBITMAP CDECL X11DRV_CreateDIBSection( X11DRV_PDEVICE *physDev, HBITMAP hbitmap,
     if(dib.dsBm.bmBitsPixel == 1)
     {
         physBitmap->pixmap_depth = 1;
+        physBitmap->trueColor = FALSE;
     }
     else
     {
         physBitmap->pixmap_depth = screen_depth;
         physBitmap->pixmap_color_shifts = X11DRV_PALETTE_default_shifts;
+        physBitmap->trueColor = (visual->class == TrueColor || visual->class == DirectColor);
     }
 #ifdef HAVE_LIBXXSHM
     physBitmap->shminfo.shmid = -1;

dlls/winex11.drv/x11drv.h

@@ -124,6 +124,7 @@ typedef struct
     XImage      *image;             /* cached XImage */
     int         *colorMap;          /* color map info */
     int          nColorMap;
+    BOOL         trueColor;
     CRITICAL_SECTION lock;          /* GDI access lock */
     enum x11drv_shm_mode shm_mode;
 #ifdef HAVE_LIBXXSHM