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diff --git a/Source/WebCore/html/canvas/CanvasPath.cpp b/Source/WebCore/html/canvas/CanvasPath.cpp
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+/*
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
+ * Copyright (C) 2007 Alp Toker <alp@atoker.com>
+ * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
+ * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
+ * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
+ * Copyright (C) 2012 Intel Corporation. All rights reserved.
+ * Copyright (C) 2012, 2013 Adobe Systems Incorporated. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "CanvasPath.h"
+
+#include "AffineTransform.h"
+#include "ExceptionCode.h"
+#include "FloatRect.h"
+#include <wtf/MathExtras.h>
+
+namespace WebCore {
+
+void CanvasPath::closePath()
+{
+ if (m_path.isEmpty())
+ return;
+
+ FloatRect boundRect = m_path.fastBoundingRect();
+ if (boundRect.width() || boundRect.height())
+ m_path.closeSubpath();
+}
+
+void CanvasPath::moveTo(float x, float y)
+{
+ if (!std::isfinite(x) || !std::isfinite(y))
+ return;
+ if (!hasInvertibleTransform())
+ return;
+ m_path.moveTo(FloatPoint(x, y));
+}
+
+void CanvasPath::lineTo(FloatPoint point)
+{
+ lineTo(point.x(), point.y());
+}
+
+void CanvasPath::lineTo(float x, float y)
+{
+ if (!std::isfinite(x) || !std::isfinite(y))
+ return;
+ if (!hasInvertibleTransform())
+ return;
+
+ FloatPoint p1 = FloatPoint(x, y);
+ if (!m_path.hasCurrentPoint())
+ m_path.moveTo(p1);
+ else if (p1 != m_path.currentPoint())
+ m_path.addLineTo(p1);
+}
+
+void CanvasPath::quadraticCurveTo(float cpx, float cpy, float x, float y)
+{
+ if (!std::isfinite(cpx) || !std::isfinite(cpy) || !std::isfinite(x) || !std::isfinite(y))
+ return;
+ if (!hasInvertibleTransform())
+ return;
+ if (!m_path.hasCurrentPoint())
+ m_path.moveTo(FloatPoint(cpx, cpy));
+
+ FloatPoint p1 = FloatPoint(x, y);
+ FloatPoint cp = FloatPoint(cpx, cpy);
+ if (p1 != m_path.currentPoint() || p1 != cp)
+ m_path.addQuadCurveTo(cp, p1);
+}
+
+void CanvasPath::bezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y)
+{
+ if (!std::isfinite(cp1x) || !std::isfinite(cp1y) || !std::isfinite(cp2x) || !std::isfinite(cp2y) || !std::isfinite(x) || !std::isfinite(y))
+ return;
+ if (!hasInvertibleTransform())
+ return;
+ if (!m_path.hasCurrentPoint())
+ m_path.moveTo(FloatPoint(cp1x, cp1y));
+
+ FloatPoint p1 = FloatPoint(x, y);
+ FloatPoint cp1 = FloatPoint(cp1x, cp1y);
+ FloatPoint cp2 = FloatPoint(cp2x, cp2y);
+ if (p1 != m_path.currentPoint() || p1 != cp1 || p1 != cp2)
+ m_path.addBezierCurveTo(cp1, cp2, p1);
+}
+
+ExceptionOr<void> CanvasPath::arcTo(float x1, float y1, float x2, float y2, float r)
+{
+ if (!std::isfinite(x1) || !std::isfinite(y1) || !std::isfinite(x2) || !std::isfinite(y2) || !std::isfinite(r))
+ return { };
+
+ if (r < 0)
+ return Exception { INDEX_SIZE_ERR };
+
+ if (!hasInvertibleTransform())
+ return { };
+
+ FloatPoint p1 = FloatPoint(x1, y1);
+ FloatPoint p2 = FloatPoint(x2, y2);
+
+ if (!m_path.hasCurrentPoint())
+ m_path.moveTo(p1);
+ else if (p1 == m_path.currentPoint() || p1 == p2 || !r)
+ lineTo(x1, y1);
+ else
+ m_path.addArcTo(p1, p2, r);
+
+ return { };
+}
+
+static void normalizeAngles(float& startAngle, float& endAngle, bool anticlockwise)
+{
+ float newStartAngle = startAngle;
+ if (newStartAngle < 0)
+ newStartAngle = (2 * piFloat) + fmodf(newStartAngle, -(2 * piFloat));
+ else
+ newStartAngle = fmodf(newStartAngle, 2 * piFloat);
+
+ float delta = newStartAngle - startAngle;
+ startAngle = newStartAngle;
+ endAngle = endAngle + delta;
+ ASSERT(newStartAngle >= 0 && newStartAngle < 2 * piFloat);
+
+ if (anticlockwise && startAngle - endAngle >= 2 * piFloat)
+ endAngle = startAngle - 2 * piFloat;
+ else if (!anticlockwise && endAngle - startAngle >= 2 * piFloat)
+ endAngle = startAngle + 2 * piFloat;
+}
+
+ExceptionOr<void> CanvasPath::arc(float x, float y, float radius, float startAngle, float endAngle, bool anticlockwise)
+{
+ if (!std::isfinite(x) || !std::isfinite(y) || !std::isfinite(radius) || !std::isfinite(startAngle) || !std::isfinite(endAngle))
+ return { };
+
+ if (radius < 0)
+ return Exception { INDEX_SIZE_ERR };
+
+ if (!hasInvertibleTransform())
+ return { };
+
+ normalizeAngles(startAngle, endAngle, anticlockwise);
+
+ if (!radius || startAngle == endAngle) {
+ // The arc is empty but we still need to draw the connecting line.
+ lineTo(x + radius * cosf(startAngle), y + radius * sinf(startAngle));
+ return { };
+ }
+
+ m_path.addArc(FloatPoint(x, y), radius, startAngle, endAngle, anticlockwise);
+ return { };
+}
+
+ExceptionOr<void> CanvasPath::ellipse(float x, float y, float radiusX, float radiusY, float rotation, float startAngle, float endAngle, bool anticlockwise)
+{
+ if (!std::isfinite(x) || !std::isfinite(y) || !std::isfinite(radiusX) || !std::isfinite(radiusY) || !std::isfinite(rotation) || !std::isfinite(startAngle) || !std::isfinite(endAngle))
+ return { };
+
+ if (radiusX < 0 || radiusY < 0)
+ return Exception { INDEX_SIZE_ERR };
+
+ if (!hasInvertibleTransform())
+ return { };
+
+ normalizeAngles(startAngle, endAngle, anticlockwise);
+
+ if ((!radiusX && !radiusY) || startAngle == endAngle) {
+ AffineTransform transform;
+ transform.translate(x, y).rotate(rad2deg(rotation));
+
+ lineTo(transform.mapPoint(FloatPoint(radiusX * cosf(startAngle), radiusY * sinf(startAngle))));
+ return { };
+ }
+
+ if (!radiusX || !radiusY) {
+ AffineTransform transform;
+ transform.translate(x, y).rotate(rad2deg(rotation));
+
+ lineTo(transform.mapPoint(FloatPoint(radiusX * cosf(startAngle), radiusY * sinf(startAngle))));
+
+ if (!anticlockwise) {
+ for (float angle = startAngle - fmodf(startAngle, piOverTwoFloat) + piOverTwoFloat; angle < endAngle; angle += piOverTwoFloat)
+ lineTo(transform.mapPoint(FloatPoint(radiusX * cosf(angle), radiusY * sinf(angle))));
+ } else {
+ for (float angle = startAngle - fmodf(startAngle, piOverTwoFloat); angle > endAngle; angle -= piOverTwoFloat)
+ lineTo(transform.mapPoint(FloatPoint(radiusX * cosf(angle), radiusY * sinf(angle))));
+ }
+
+ lineTo(transform.mapPoint(FloatPoint(radiusX * cosf(endAngle), radiusY * sinf(endAngle))));
+ return { };
+ }
+
+ m_path.addEllipse(FloatPoint(x, y), radiusX, radiusY, rotation, startAngle, endAngle, anticlockwise);
+ return { };
+}
+
+void CanvasPath::rect(float x, float y, float width, float height)
+{
+ if (!hasInvertibleTransform())
+ return;
+
+ if (!std::isfinite(x) || !std::isfinite(y) || !std::isfinite(width) || !std::isfinite(height))
+ return;
+
+ if (!width && !height) {
+ m_path.moveTo(FloatPoint(x, y));
+ return;
+ }
+
+ m_path.addRect(FloatRect(x, y, width, height));
+}
+}
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