From f5e8838bb0292fa6d49f17f6508dd7a9d01b730f Mon Sep 17 00:00:00 2001
From: Nicolas Pierron <nicolas.b.pierron@gmail.com>
Date: Thu, 15 Nov 2012 23:46:43 -0800
Subject: [PATCH] Ensure the loop counter is not interpreted as a double.
This patch improves pure JavaScript performances by 30% by removing double computations from Type1Parser_extractFontProgram. When parseInt is fed with non numerical values, it returns a NaN which flows into the loop counter which cause every operation to be computed as a double and every index to be trunctated as an int before reading a character. This patch force the NaN value to be coerce as an integer by using a bitwise-or operation with zero.
---
src/fonts.js | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/fonts.js b/src/fonts.js
index 646ef5c49..04fcc5dca 100644
--- a/src/fonts.js
+++ b/src/fonts.js
@@ -4755,7 +4755,9 @@ var Type1Parser = function type1Parser() {
i += length;
token = '';
} else if (isSeparator(c)) {
- length = parseInt(token, 10);
+ // Use '| 0' to prevent setting a double into length such as the double
+ // does not flow into the loop variable.
+ length = parseInt(token, 10) | 0;
token = '';
} else {
token += c;