Zero-length path with round/square lineCap should paint circle on Canvas

third_party/WebKit/Source/modules/canvas2d/CanvasPathMethods.cpp

 /*
  * 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, 2013 Intel Corporation. All rights reserved.
  * Copyright (C) 2012, 2013 Adobe Systems Incorporated. All rights reserved.
  *
@@ skipping 53 matching lines @@
 void CanvasPathMethods::lineTo(float x, float y)
 {
     if (!std::isfinite(x) || !std::isfinite(y))
         return;
     if (!isTransformInvertible())
         return;
 
     FloatPoint p1 = FloatPoint(x, y);
     if (!m_path.hasCurrentPoint())
         m_path.moveTo(p1);
-    else if (p1 != m_path.currentPoint())
-        m_path.addLineTo(p1);
+
+    m_path.addLineTo(p1);
 }
 
 void CanvasPathMethods::quadraticCurveTo(float cpx, float cpy, float x, float y)
 {
     if (!std::isfinite(cpx) || !std::isfinite(cpy) || !std::isfinite(x) || !std::isfinite(y))
         return;
     if (!isTransformInvertible())
         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);
+
+    m_path.addQuadCurveTo(cp, p1);
 }
 
 void CanvasPathMethods::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 (!isTransformInvertible())
         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);
+
+    m_path.addBezierCurveTo(cp1, cp2, p1);
 }
 
 void CanvasPathMethods::arcTo(float x1, float y1, float x2, float y2, float r, ExceptionState& exceptionState)
 {
     if (!std::isfinite(x1) || !std::isfinite(y1) || !std::isfinite(x2) || !std::isfinite(y2) || !std::isfinite(r))
         return;
 
     if (r < 0) {
         exceptionState.throwDOMException(IndexSizeError, "The radius provided (" + String::number(r) + ") is negative.");
         return;
@@ skipping 191 matching lines @@
 }
 
 void CanvasPathMethods::rect(float x, float y, float width, float height)
 {
     if (!isTransformInvertible())
         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));
 }
 } // namespace blink