[PATCH v2 09/12] win32u: Fix an off-by-one error generating the round rect corners.

[Elizabeth Figura]

From: Elizabeth Figura

get_arc_points() uses the GM_ADVANCED convention, where a MxN rect is one with
M = (right - left + 1), N = (top - bottom + 1).
---
 dlls/win32u/dibdrv/graphics.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dlls/win32u/dibdrv/graphics.c b/dlls/win32u/dibdrv/graphics.c
index fb92f137b9b..36fe965c4b6 100644
--- a/dlls/win32u/dibdrv/graphics.c
+++ b/dlls/win32u/dibdrv/graphics.c
@@ -1623,11 +1623,11 @@ BOOL dibdrv_RoundRect( PHYSDEV dev, INT left, INT top, INT right, INT bottom,
     SetRect( &rect, left, top, right, bottom );
     order_rect( &rect );

-    SetRect( &arc_rect, rect.left, rect.top, rect.left + ellipse_width, rect.top + ellipse_height );
+    SetRect( &arc_rect, rect.left, rect.top, rect.left + ellipse_width - 1, rect.top + ellipse_height - 1 );
     count = get_arc_points( dc, AD_CLOCKWISE, &arc_rect, arc_rect.left, (arc_rect.top + arc_rect.bottom) / 2,
                             (arc_rect.left + arc_rect.right) / 2, arc_rect.top, top_points );

-    SetRect( &arc_rect, rect.right - ellipse_width, rect.top, rect.right, rect.top + ellipse_height );
+    SetRect( &arc_rect, rect.right - ellipse_width + 1, rect.top, rect.right, rect.top + ellipse_height - 1 );
     count += get_arc_points( dc, AD_CLOCKWISE, &arc_rect, (arc_rect.left + arc_rect.right + 1) / 2, arc_rect.top,
                              arc_rect.right, (arc_rect.top + arc_rect.bottom) / 2, top_points + count );