gdi32: Merge rectangles horizontally when possible in CreatePolyPolygonRgn.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50539Signed-off-by: Alexandre Julliard <julliard@winehq.org>

gdi32: Merge rectangles horizontally when possible in CreatePolyPolygonRgn.
b67f39cc · Alexandre Julliard · 70d12630 · b67f39cc
Commit b67f39cc authored Jan 22, 2021 by Alexandre Julliard
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Showing with 6 additions and 3 deletions

region.c dlls/gdi32/region.c +6 -3

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--- a/dlls/gdi32/region.c
+++ b/dlls/gdi32/region.c
@@ -2613,12 +2613,15 @@ static void scan_convert( WINEREGION *obj, EdgeTable *ET, INT mode, const RECT *
                    {
                        obj->rects[obj->numRects].left = active->bres.minor_axis;
                        obj->rects[obj->numRects].top = y;
+                        obj->rects[obj->numRects].bottom = y + 1;
                    }
                    else if (obj->rects[obj->numRects].left != active->bres.minor_axis)
                    {
-                        obj->rects[obj->numRects].right = active->bres.minor_axis;
-                        obj->rects[obj->numRects].bottom = y + 1;
-                        obj->numRects++;
+                        /* create new rect only if we can't merge with the previous one */
+                        if (!obj->numRects || obj->rects[obj->numRects-1].top != y ||
+                            obj->rects[obj->numRects-1].right < obj->rects[obj->numRects].left)
+                            obj->numRects++;
+                        obj->rects[obj->numRects-1].right = active->bres.minor_axis;
                    }
                    first = !first;
                }