1 files changed, 105 insertions, 0 deletions
diff --git a/Source/WebCore/platform/graphics/FloatQuad.cpp b/Source/WebCore/platform/graphics/FloatQuad.cpp
new file mode 100644
index 0000000..d1069fb
--- /dev/null
+++ b/Source/WebCore/platform/graphics/FloatQuad.cpp
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2008 Apple Inc. 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. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 APPLE OR ITS CONTRIBUTORS 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 "FloatQuad.h"
+
+#include <algorithm>
+
+using std::max;
+using std::min;
+
+namespace WebCore {
+
+static inline float min4(float a, float b, float c, float d)
+{
+    return min(min(a, b), min(c, d));
+}
+
+static inline float max4(float a, float b, float c, float d)
+{
+    return max(max(a, b), max(c, d));
+}
+
+inline float dot(const FloatSize& a, const FloatSize& b)
+{
+    return a.width() * b.width() + a.height() * b.height();
+}
+
+inline bool isPointInTriangle(const FloatPoint& p, const FloatPoint& t1, const FloatPoint& t2, const FloatPoint& t3)
+{
+    // Compute vectors        
+    FloatSize v0 = t3 - t1;
+    FloatSize v1 = t2 - t1;
+    FloatSize v2 = p - t1;
+    
+    // Compute dot products
+    float dot00 = dot(v0, v0);
+    float dot01 = dot(v0, v1);
+    float dot02 = dot(v0, v2);
+    float dot11 = dot(v1, v1);
+    float dot12 = dot(v1, v2);
+
+    // Compute barycentric coordinates
+    float invDenom = 1.0f / (dot00 * dot11 - dot01 * dot01);
+    float u = (dot11 * dot02 - dot01 * dot12) * invDenom;
+    float v = (dot00 * dot12 - dot01 * dot02) * invDenom;
+
+    // Check if point is in triangle
+    return (u >= 0) && (v >= 0) && (u + v <= 1);
+}
+
+FloatRect FloatQuad::boundingBox() const
+{
+    float left   = min4(m_p1.x(), m_p2.x(), m_p3.x(), m_p4.x());
+    float top    = min4(m_p1.y(), m_p2.y(), m_p3.y(), m_p4.y());
+
+    float right  = max4(m_p1.x(), m_p2.x(), m_p3.x(), m_p4.x());
+    float bottom = max4(m_p1.y(), m_p2.y(), m_p3.y(), m_p4.y());
+    
+    return FloatRect(left, top, right - left, bottom - top);
+}
+
+bool FloatQuad::isRectilinear() const
+{
+    return (m_p1.x() == m_p2.x() && m_p2.y() == m_p3.y() && m_p3.x() == m_p4.x() && m_p4.y() == m_p1.y())
+        || (m_p1.y() == m_p2.y() && m_p2.x() == m_p3.x() && m_p3.y() == m_p4.y() && m_p4.x() == m_p1.x());
+}
+
+bool FloatQuad::containsPoint(const FloatPoint& p) const
+{
+    return isPointInTriangle(p, m_p1, m_p2, m_p3) || isPointInTriangle(p, m_p1, m_p3, m_p4);
+} 
+
+// Note that we only handle convex quads here.
+bool FloatQuad::containsQuad(const FloatQuad& other) const
+{
+    return containsPoint(other.p1()) && containsPoint(other.p2()) && containsPoint(other.p3()) && containsPoint(other.p4());
+}
+
+} // namespace WebCore