From: Giang Nguyen <nen24t@gmail.com> In d2d_arc_to_bezier(), when computing the affine transform that maps the canonical unit-arc parameter space to the actual arc, the translation contribution from the arc center is meant to be the linear matrix-vector product M * center, i.e.: (_31, _32) += (M11*cx + M12*cy, M21*cx + M22*cy) The first line of the update used center.x in both terms, which yields M11*cx + M12*cx instead of M11*cx + M12*cy. Effect is invisible when M12 == 0 (i.e. arc->rotationAngle == 0), which is the common case for unrotated arcs in UI rendering. Becomes visible for arcs with a non-zero rotationAngle, where the arc center ends up displaced along the rotation axis. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=59718 Signed-off-by: Giang Nguyen <nen24t@gmail.com> --- dlls/d2d1/geometry.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/dlls/d2d1/geometry.c b/dlls/d2d1/geometry.c index 51d587673dd..a793e298c2f 100644 --- a/dlls/d2d1/geometry.c +++ b/dlls/d2d1/geometry.c @@ -1312,7 +1312,7 @@ static int d2d_arc_to_bezier(const D2D_POINT_2F *start_point, const D2D1_ARC_SEG m._32 = 0.5f * (arc->point.y + start_point->y); if (!zero_center) { - m._31 += (m._11 * center.x + m._12 * center.x); + m._31 += (m._11 * center.x + m._12 * center.y); m._32 += (m._21 * center.x + m._22 * center.y); } -- GitLab https://gitlab.winehq.org/wine/wine/-/merge_requests/10813