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diff --git a/gfx/thebes/gfxQuad.h b/gfx/thebes/gfxQuad.h
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GFX_QUAD_H
+#define GFX_QUAD_H
+
+#include "gfxTypes.h"
+#include "gfxRect.h"
+#include "gfxLineSegment.h"
+#include <algorithm>
+
+struct gfxQuad {
+ gfxQuad(const gfxPoint& aOne, const gfxPoint& aTwo, const gfxPoint& aThree,
+ const gfxPoint& aFour) {
+ mPoints[0] = aOne;
+ mPoints[1] = aTwo;
+ mPoints[2] = aThree;
+ mPoints[3] = aFour;
+ }
+
+ bool Contains(const gfxPoint& aPoint) {
+ return (gfxLineSegment(mPoints[0], mPoints[1])
+ .PointsOnSameSide(aPoint, mPoints[2]) &&
+ gfxLineSegment(mPoints[1], mPoints[2])
+ .PointsOnSameSide(aPoint, mPoints[3]) &&
+ gfxLineSegment(mPoints[2], mPoints[3])
+ .PointsOnSameSide(aPoint, mPoints[0]) &&
+ gfxLineSegment(mPoints[3], mPoints[0])
+ .PointsOnSameSide(aPoint, mPoints[1]));
+ }
+
+ gfxRect GetBounds() {
+ gfxFloat min_x, max_x;
+ gfxFloat min_y, max_y;
+
+ min_x = max_x = mPoints[0].x;
+ min_y = max_y = mPoints[0].y;
+
+ for (int i = 1; i < 4; i++) {
+ min_x = std::min(mPoints[i].x.value, min_x);
+ max_x = std::max(mPoints[i].x.value, max_x);
+ min_y = std::min(mPoints[i].y.value, min_y);
+ max_y = std::max(mPoints[i].y.value, max_y);
+ }
+ return gfxRect(min_x, min_y, max_x - min_x, max_y - min_y);
+ }
+
+ gfxPoint mPoints[4];
+};
+
+#endif /* GFX_QUAD_H */