Rename CFX_FloatRect::Scale() to ScaleFromCenterPoint().

Change-Id: I6baab14c989e8ae692ed1c846b135af95c09ce37
Reviewed-on: https://pdfium-review.googlesource.com/20210
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/core/fxcrt/fx_coordinates.cpp b/core/fxcrt/fx_coordinates.cpp
index c345a822b9..136ae72527 100644
--- a/core/fxcrt/fx_coordinates.cpp
+++ b/core/fxcrt/fx_coordinates.cpp
@@ -148,6 +148,20 @@ void CFX_FloatRect::UpdateRect(const CFX_PointF& point) {
   top = std::max(top, point.y);
 }
 
+void CFX_FloatRect::ScaleFromCenterPoint(float fScale) {
+  float fHalfWidth = (right - left) / 2.0f;
+  float fHalfHeight = (top - bottom) / 2.0f;
+
+  float center_x = (left + right) / 2;
+  float center_y = (top + bottom) / 2;
+
+  left = center_x - fHalfWidth * fScale;
+  bottom = center_y - fHalfHeight * fScale;
+  right = center_x + fHalfWidth * fScale;
+  top = center_y + fHalfHeight * fScale;
+}
+
+// static
 CFX_FloatRect CFX_FloatRect::GetBBox(const CFX_PointF* pPoints, int nPoints) {
   if (nPoints == 0)
     return CFX_FloatRect();