Change SetReverse to GetInverse in CFX_Matrix

CFX_Matrix::GetInverse is much clearer.
Change-Id: Id10ab1723735332e1a78de853f28415ec3a4d834
Reviewed-on: https://pdfium-review.googlesource.com/7090
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>

2 files changed, 3 insertions, 9 deletions

diff --git a/xfa/fwl/cfwl_widget.cpp b/xfa/fwl/cfwl_widget.cpp
index 172014da62..45ae9c0b0c 100644
--- a/xfa/fwl/cfwl_widget.cpp
+++ b/xfa/fwl/cfwl_widget.cpp
@@ -197,9 +197,8 @@ CFX_PointF CFWL_Widget::TransformTo(CFWL_Widget* pWidget,
   if (!parent)
     return ret;
 
-  CFX_Matrix m;
-  m.SetReverse(pWidget->GetMatrix());
-  return m.Transform(ret) - pWidget->GetWidgetRect().TopLeft();
+  return pWidget->GetMatrix().GetInverse().Transform(ret) -
+         pWidget->GetWidgetRect().TopLeft();
 }
 
 CFX_Matrix CFWL_Widget::GetMatrix() {
diff --git a/xfa/fwl/cfwl_widgetmgr.cpp b/xfa/fwl/cfwl_widgetmgr.cpp
index 67a63ba921..3abe14d89b 100644
--- a/xfa/fwl/cfwl_widgetmgr.cpp
+++ b/xfa/fwl/cfwl_widgetmgr.cpp
@@ -266,12 +266,7 @@ CFWL_Widget* CFWL_WidgetMgr::GetWidgetAtPoint(CFWL_Widget* parent,
   CFWL_Widget* child = GetLastChildWidget(parent);
   while (child) {
     if ((child->GetStates() & FWL_WGTSTATE_Invisible) == 0) {
-      CFX_Matrix m;
-      m.SetIdentity();
-
-      CFX_Matrix matrixOnParent;
-      m.SetReverse(matrixOnParent);
-      pos = m.Transform(point);
+      pos = parent->GetMatrix().GetInverse().Transform(point);
 
       CFX_RectF bounds = child->GetWidgetRect();
       if (bounds.Contains(pos)) {