gdi32: Implement GetPixel in the null driver using GetImage.

dlls/gdi32/bitblt.c

@@ -472,6 +472,35 @@ done:
     return ret;
 }
 
+COLORREF nulldrv_GetPixel( PHYSDEV dev, INT x, INT y )
+{
+    DC *dc = get_nulldrv_dc( dev );
+    char buffer[FIELD_OFFSET( BITMAPINFO, bmiColors[256] )];
+    BITMAPINFO *info = (BITMAPINFO *)buffer;
+    struct bitblt_coords src;
+    struct gdi_image_bits bits;
+    COLORREF ret;
+
+    src.visrect.left = x;
+    src.visrect.top  = y;
+    LPtoDP( dev->hdc, (POINT *)&src.visrect, 1 );
+    src.visrect.right  = src.visrect.left + 1;
+    src.visrect.bottom = src.visrect.top + 1;
+    src.x = src.visrect.left;
+    src.y = src.visrect.top;
+    src.width = src.height = 1;
+
+    if (!clip_visrect( dc, &src.visrect, &src.visrect )) return CLR_INVALID;
+
+    dev = GET_DC_PHYSDEV( dc, pGetImage );
+    if (dev->funcs->pGetImage( dev, 0, info, &bits, &src )) return CLR_INVALID;
+
+    ret = get_pixel_bitmapinfo( info, bits.ptr, &src );
+    if (bits.free) bits.free( &bits );
+    return ret;
+}
+
+
 /***********************************************************************
  *           PatBlt    (GDI32.@)
  */

dlls/gdi32/dibdrv/bitblt.c

@@ -1372,6 +1372,19 @@ DWORD gradient_bitmapinfo( const BITMAPINFO *info, void *bits, TRIVERTEX *vert_a
     return ret;
 }
 
+COLORREF get_pixel_bitmapinfo( const BITMAPINFO *info, void *bits, struct bitblt_coords *src )
+{
+    dib_info dib;
+    POINT pt;
+    DWORD pixel;
+
+    init_dib_info_from_bitmapinfo( &dib, info, bits, default_color_table );
+    pt.x  = src->x;
+    pt.y  = src->y;
+    pixel = dib.funcs->get_pixel( &dib, &pt );
+    return dib.funcs->pixel_to_colorref( &dib, pixel );
+}
+
 /***********************************************************************
  *           dibdrv_StretchBlt
  */

dlls/gdi32/driver.c

@@ -394,11 +394,6 @@ static UINT nulldrv_GetOutlineTextMetrics( PHYSDEV dev, UINT size, LPOUTLINETEXT
     return 0;
 }
 
-static COLORREF nulldrv_GetPixel( PHYSDEV dev, INT x, INT y )
-{
-    return CLR_INVALID;
-}
-
 static INT nulldrv_GetPixelFormat( PHYSDEV dev )
 {
     return 0;

dlls/gdi32/gdi_private.h

@@ -250,6 +250,7 @@ extern DWORD blend_bitmapinfo( const BITMAPINFO *src_info, void *src_bits, struc
                                BLENDFUNCTION blend ) DECLSPEC_HIDDEN;
 extern DWORD gradient_bitmapinfo( const BITMAPINFO *info, void *bits, TRIVERTEX *vert_array, ULONG nvert,
                                   void *grad_array, ULONG ngrad, ULONG mode, const POINT *dev_pts, HRGN rgn ) DECLSPEC_HIDDEN;
+extern COLORREF get_pixel_bitmapinfo( const BITMAPINFO *info, void *bits, struct bitblt_coords *src ) DECLSPEC_HIDDEN;
 extern BOOL render_aa_text_bitmapinfo( HDC hdc, BITMAPINFO *info, struct gdi_image_bits *bits,
                                        struct bitblt_coords *src, INT x, INT y, UINT flags,
                                        UINT aa_flags, LPCWSTR str, UINT count, const INT *dx ) DECLSPEC_HIDDEN;
@@ -356,6 +357,7 @@ extern BOOL nulldrv_FrameRgn( PHYSDEV dev, HRGN rgn, HBRUSH brush, INT width, IN
 extern LONG nulldrv_GetBitmapBits( HBITMAP bitmap, void *bits, LONG size ) DECLSPEC_HIDDEN;
 extern DWORD nulldrv_GetImage( PHYSDEV dev, HBITMAP hbitmap, BITMAPINFO *info, struct gdi_image_bits *bits, struct bitblt_coords *src ) DECLSPEC_HIDDEN;
 extern COLORREF nulldrv_GetNearestColor( PHYSDEV dev, COLORREF color ) DECLSPEC_HIDDEN;
+extern COLORREF nulldrv_GetPixel( PHYSDEV dev, INT x, INT y ) DECLSPEC_HIDDEN;
 extern BOOL nulldrv_GradientFill( PHYSDEV dev, TRIVERTEX *vert_array, ULONG nvert,
                                   void * grad_array, ULONG ngrad, ULONG mode ) DECLSPEC_HIDDEN;
 extern INT  nulldrv_IntersectClipRect( PHYSDEV dev, INT left, INT top, INT right, INT bottom ) DECLSPEC_HIDDEN;

dlls/gdi32/painting.c

@@ -476,13 +476,9 @@ COLORREF WINAPI GetPixel( HDC hdc, INT x, INT y )
 
     if (dc)
     {
-        update_dc( dc );
-        /* FIXME: should this be in the graphics driver? */
-        if (PtVisible( hdc, x, y ))
-        {
         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pGetPixel );
+        update_dc( dc );
         ret = physdev->funcs->pGetPixel( physdev, x, y );
-        }
         release_dc_ptr( dc );
     }
     return ret;