winex11: Abstract the depth->bpp conversion and use it in X11DRV_DIB_CreateDIBFromPixmap.

dlls/winex11.drv/dib.c

@@ -4856,7 +4856,7 @@ HGLOBAL X11DRV_DIB_CreateDIBFromPixmap(Pixmap pixmap, HDC hdc)
      * Create an HBITMAP with the same dimensions and BPP as the pixmap,
      * and make it a container for the pixmap passed.
      */
-    hBmp = CreateBitmap( width, height, 1, depth, NULL );
+    if (!(hBmp = CreateBitmap( width, height, 1, depth_to_bpp(depth), NULL ))) return 0;
 
     /* force bitmap to be owned by a screen DC */
     hdcMem = CreateCompatibleDC( hdc );

dlls/winex11.drv/x11drv.h

@@ -463,6 +463,8 @@ extern BOOL X11DRV_IsSolidColor(COLORREF color);
 extern COLORREF X11DRV_PALETTE_ToLogical(int pixel);
 extern int X11DRV_PALETTE_ToPhysical(X11DRV_PDEVICE *physDev, COLORREF color);
 
+extern unsigned int depth_to_bpp( unsigned int depth );
+
 /* GDI escapes */
 
 #define X11DRV_ESCAPE 6789

dlls/winex11.drv/x11drv_main.c

@@ -277,6 +277,37 @@ void wine_tsx11_unlock(void)
 }
 
 
+/***********************************************************************
+ *		depth_to_bpp
+ *
+ * Convert X11-reported depth to the BPP value that Windows apps expect to see.
+ */
+unsigned int depth_to_bpp( unsigned int depth )
+{
+    switch (depth)
+    {
+    case 1:
+    case 8:
+        return depth;
+    case 15:
+    case 16:
+        return 16;
+    case 24:
+        /* This is not necessarily right. X11 always has 24 bits per pixel, but it can run
+         * with 24 bit framebuffers and 32 bit framebuffers. It doesn't make any difference
+         * for windowing, but gl applications can get visuals with alpha channels. So we
+         * should check the framebuffer and/or opengl formats available to find out what the
+         * framebuffer actually does
+         */
+    case 32:
+        return 32;
+    default:
+        FIXME( "Unexpected X11 depth %d bpp, what to report to app?\n", depth );
+        return depth;
+    }
+}
+
+
 /***********************************************************************
  *		get_config_key
  *
@@ -491,35 +522,7 @@ static BOOL process_attach(void)
         screen_depth = desktop_vi->depth;
         XFree(desktop_vi);
     }
-
+    screen_bpp = depth_to_bpp( screen_depth );
-    switch(screen_depth) {
-        case 8:
-            screen_bpp = 8;
-            break;
-
-        case 15:
-            /* In GetDeviceCaps MSDN description explicitly states that
-             * in 15 bpp mode 16 is returned.
-             */
-            /* fall through */
-        case 16:
-            screen_bpp = 16;
-            break;
-
-        case 24:
-            /* This is not necessarily right. X11 always has 24 bits per pixel, but it can run
-             * with 24 bit framebuffers and 32 bit framebuffers. It doesn't make any difference
-             * for windowing, but gl applications can get visuals with alpha channels. So we
-             * should check the framebuffer and/or opengl formats available to find out what the
-             * framebuffer actually does
-             */
-            screen_bpp = 32;
-            break;
-
-        default:
-            FIXME("Unexpected X11 depth %d bpp, what to report to app?\n", screen_depth);
-            screen_bpp = screen_depth;
-    }
 
     XInternAtoms( display, (char **)atom_names, NB_XATOMS - FIRST_XATOM, False, X11DRV_Atoms );