From 4b1e57ac72093ee5b759a5825f9d5a8eb9e2f994 Mon Sep 17 00:00:00 2001
From: Harrison Deng <yunyangdeng@gmail.com>
Date: Fri, 10 Jul 2020 19:00:36 -0500
Subject: [PATCH] More data safety checking, doesn't load spaces.

---
 .../Graphics/Text/BitmapFont.cs                           | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/SlatedGameToolkit.Framework/Graphics/Text/BitmapFont.cs b/src/SlatedGameToolkit.Framework/Graphics/Text/BitmapFont.cs
index 57cba5e..f87d3b9 100644
--- a/src/SlatedGameToolkit.Framework/Graphics/Text/BitmapFont.cs
+++ b/src/SlatedGameToolkit.Framework/Graphics/Text/BitmapFont.cs
@@ -45,7 +45,12 @@ namespace SlatedGameToolkit.Framework.Graphics.Text
         public unsafe BitmapFont(byte[] data, GLContext glContext = null, int cacheSize = 1024, int textures = 2, uint textureSizes = 512) {
             info = new StbTrueType.stbtt_fontinfo();
             fixed(byte* dataPtr = &data[0]) {
-                StbTrueType.stbtt_InitFont(info, dataPtr, 0);
+                int offset = StbTrueType.stbtt_GetFontOffsetForIndex(dataPtr, 0);
+                if (offset != -1) {
+                    StbTrueType.stbtt_InitFont(info, dataPtr, offset);
+                } else {
+                    throw new FrameworkUsageException("Could not load ttf file.");
+                }
             }
 
             this.glyphIndices = new LRUCache<char, int>(cacheSize);
@@ -90,6 +95,7 @@ namespace SlatedGameToolkit.Framework.Graphics.Text
             int textureChanges = 0;
             foreach (char c in characters)
             {
+                if (c == ' ') continue;
                 if (!glyphTexLocations.ContainsKey((c, scale)) || !textures[glyphTexLocations[(c, scale)]].ContainsChar(c, scale)) {
                     glyphTexLocations.Remove((c, scale));
                     if (!textures[drawingTo].Upload(scale, c)) {