[GeometryInterface] add transformPoint(point) function.

third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp

Index: third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp
diff --git a/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp b/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp
index 1922a50b0872e2c1c044a280031071651191fa5a..6bccffcb1f07552bce05e239d618af6720367660 100644
--- a/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp
+++ b/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp
@@ -4,6 +4,8 @@
 
 #include "core/dom/DOMMatrix.h"
 #include "core/dom/DOMMatrixInit.h"
+#include "core/dom/DOMPoint.h"
+#include "core/dom/DOMPointInit.h"
 
 namespace blink {
 namespace {
@@ -226,6 +228,24 @@ DOMMatrix* DOMMatrixReadOnly::inverse() {
   return DOMMatrix::create(this)->invertSelf();
 }
 
+DOMPoint* DOMMatrixReadOnly::transformPoint(const DOMPointInit& point) {

[dominicc (has gone to gerrit), 2016/11/08 08:55:34]

I'm curious but what's the efficiency in our bindings of passing DOMPoint to a
method which takes DOMPointInit? Is it possible we want to make this fast(er) by
possibly special-casing DOMPoint, DOMPointReadOnly?

[Hwanseung Lee, 2016/11/13 02:47:10]

i think it is almost same.
DOMPointInit have all attribute of DOMPoint or DOMPointReadOnly.
when DOMPointInit binding to cpp from javascript object, all attribute was
binding.
this processing is similar at DOMPoint or DOMPointReadOnly.
actually i think DOMPointInit is more simpler than DOMPoint or DOMPointReadOnly
in oder to binding.
because DOMPointInit is dictionary type of IDL.
how do you think? is it right my thought?

refer to below link.
DOMPointInit
https://cs.chromium.org/chromium/src/out/Debug/gen/blink/bindings/core/v8/V8D...
DOMPoint
https://cs.chromium.org/chromium/src/out/Debug/gen/blink/bindings/core/v8/V8D...
DOMPointReadOnly
https://cs.chromium.org/chromium/src/out/Debug/gen/blink/bindings/core/v8/V8D...

+  if (is2D() && point.z() == 0 && point.w() == 1) {
+    double x = point.x() * m11() + point.y() * m12() + m41();
+    double y = point.x() * m12() + point.y() * m22() + m42();
+    return DOMPoint::create(x, y, 0, 1);
+  }
+
+  double x = point.x() * m11() + point.y() * m21() + point.z() * m31() +
+             point.w() * m41();
+  double y = point.x() * m12() + point.y() * m22() + point.z() * m32() +
+             point.w() * m42();
+  double z = point.x() * m13() + point.y() * m23() + point.z() * m33() +
+             point.w() * m43();
+  double w = point.x() * m14() + point.y() * m24() + point.z() * m34() +
+             point.w() * m44();
+  return DOMPoint::create(x, y, z, w);
+}
+
 DOMFloat32Array* DOMMatrixReadOnly::toFloat32Array() const {
   float array[] = {
       static_cast<float>(m_matrix->m11()), static_cast<float>(m_matrix->m12()),