From a18609ae0da3d0d3353a6492bf16a2af3b8dff83 Mon Sep 17 00:00:00 2001
From: Gary Qian <garyq@google.com>
Date: Fri, 10 May 2019 09:58:53 -0700
Subject: [PATCH] Prevent redundant layouts when floor(width) is the same
 (flutter/engine#8867)

---
 engine/src/flutter/third_party/txt/src/txt/paragraph.cc | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/engine/src/flutter/third_party/txt/src/txt/paragraph.cc b/engine/src/flutter/third_party/txt/src/txt/paragraph.cc
index 23981c41ef5..296609f29c1 100644
--- a/engine/src/flutter/third_party/txt/src/txt/paragraph.cc
+++ b/engine/src/flutter/third_party/txt/src/txt/paragraph.cc
@@ -477,13 +477,15 @@ void Paragraph::ComputeStrut(StrutMetrics* strut, SkFont& font) {
 }
 
 void Paragraph::Layout(double width, bool force) {
+  double rounded_width = floor(width);
   // Do not allow calling layout multiple times without changing anything.
-  if (!needs_layout_ && width == width_ && !force) {
+  if (!needs_layout_ && rounded_width == width_ && !force) {
     return;
   }
-  needs_layout_ = false;
 
-  width_ = floor(width);
+  width_ = rounded_width;
+
+  needs_layout_ = false;
 
   if (!ComputeLineBreaks())
     return;