Improving the decoder pipeline.

remoting/base/util.cc

Index: remoting/base/util.cc
diff --git a/remoting/base/util.cc b/remoting/base/util.cc
index 30691ea065531f9300883092de8dc55d5316b65b..d2ec9be23096121c92382c415af4ee7da95aa875 100644
--- a/remoting/base/util.cc
+++ b/remoting/base/util.cc
@@ -219,12 +219,14 @@ SkIRect AlignRect(const SkIRect& rect) {
 SkIRect ScaleRect(const SkIRect& rect,
                   const SkISize& in_size,
                   const SkISize& out_size) {
-  int left = (rect.left() * out_size.width()) / in_size.width();
-  int top = (rect.top() * out_size.height()) / in_size.height();
-  int right = (rect.right() * out_size.width() + out_size.width() - 1) /
-      in_size.width();
-  int bottom = (rect.bottom() * out_size.height() + out_size.height() - 1) /
-      in_size.height();
+  // Use floating point to up/down scale more accurately.
+  float scale_x = static_cast<float>(out_size.width()) / in_size.width();
+  float scale_y = static_cast<float>(out_size.height()) / in_size.height();
+
+  int left = static_cast<int>(floor(scale_x * rect.left()));
+  int top = static_cast<int>(floor(scale_y * rect.top()));
+  int right = static_cast<int>(ceil(scale_x * rect.right()));
+  int bottom = static_cast<int>(ceil(scale_y * rect.bottom()));
   return SkIRect::MakeLTRB(left, top, right, bottom);
 }