Make LoadFontFromImage limit its scanning to image dimensions.

src/rtext.c

@@ -446,7 +446,8 @@ Font LoadFontFromImage(Image image, Color key, int firstChar)
     int charHeight = 0;
     int j = 0;
 
-    while (!COLOR_EQUAL(pixels[(lineSpacing + j)*image.width + charSpacing], key)) j++;
+    while ((lineSpacing + j) < image.height && 
+          !COLOR_EQUAL(pixels[(lineSpacing + j)*image.width + charSpacing], key)) j++;
 
     charHeight = j;
 
@@ -469,7 +470,8 @@ Font LoadFontFromImage(Image image, Color key, int firstChar)
 
             int charWidth = 0;
 
-            while (!COLOR_EQUAL(pixels[(lineSpacing + (charHeight+lineSpacing)*lineToRead)*image.width + xPosToRead + charWidth], key)) charWidth++;
+            while ((xPosToRead + charWidth) < image.width && 
+                  !COLOR_EQUAL(pixels[(lineSpacing + (charHeight+lineSpacing)*lineToRead)*image.width + xPosToRead + charWidth], key)) charWidth++;
 
             tempCharRecs[index].width = (float)charWidth;