From ffc8fbe3661781475518aff476ce6c303ce5edc8 Mon Sep 17 00:00:00 2001
From: Waqar Ahmed <waqar.17a@gmail.com>
Date: Wed, 8 Dec 2021 21:53:34 +0500
Subject: [PATCH] Optimize Character::width for ascii/ < 256 cases

This runs much faster.

- Avoids table lookup
- Allows inlined method to be more useful
---
 src/characters/Character.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/characters/Character.h b/src/characters/Character.h
index 3b5b5a62..bfe2d2e6 100644
--- a/src/characters/Character.h
+++ b/src/characters/Character.h
@@ -138,6 +138,21 @@ public:
 
     static int width(uint ucs4)
     {
+        // ASCII
+        if (ucs4 >= 0x20 && ucs4 < 0x7f)
+            return 1;
+
+        if (ucs4 >= 0xA0 && ucs4 <= 0xFF)
+            return 1;
+
+        // NULL
+        if (ucs4 == 0)
+            return 0;
+
+        // Control chars
+        if ((ucs4 > 0x0 && ucs4 < 0x20) || (ucs4 >= 0x7F && ucs4 < 0xA0))
+            return -1;
+
         return characterWidth(ucs4);
     }