# HG changeset patch
# User peter1138 <peter1138@openttd.org>
# Date 1138346038 0
# Node ID ed5ede8a97214386613d711c199dc3a257be76e9
# Parent  dbb8b26c7c8d9630c3a0e693121ac5ed9399ba64
(svn r3449) - NewGRF Fix: When changing the sprite ID of a vehicle, if it is not FD (custom graphics), the value needs to changed from a 16bit array offset to an array index. (fixes tropicstw.grf)

diff --git a/newgrf.c b/newgrf.c
--- a/newgrf.c
+++ b/newgrf.c
@@ -272,6 +272,11 @@
 			FOR_EACH_OBJECT {
 				uint8 spriteid = grf_load_byte(&buf);
 
+				/* TTD sprite IDs point to a location in a 16bit array, but we use it
+				 * as an array index, so we need it to be half the original value. */
+				if (spriteid < 0xFD)
+					spriteid >>= 1;
+
 				rvi[i].image_index = spriteid;
 			}
 		} break;
@@ -481,6 +486,9 @@
 				if (spriteid == 0xFF)
 					spriteid = 0xFD; // cars have different custom id in the GRF file
 
+				if (spriteid < 0xFD)
+					spriteid >>= 1;
+
 				rvi[i].image_index = spriteid;
 			}
 		} break;
@@ -582,6 +590,9 @@
 				if (spriteid == 0xFF)
 					spriteid = 0xFD; // ships have different custom id in the GRF file
 
+				if (spriteid < 0xFD)
+					spriteid >>= 1;
+
 				svi[i].image_index = spriteid;
 			}
 		}	break;
@@ -699,6 +710,9 @@
 				if (spriteid == 0xFF)
 					spriteid = 0xFD; // ships have different custom id in the GRF file
 
+				if (spriteid < 0xFD)
+					spriteid >>= 1;
+
 				avi[i].image_index = spriteid;
 			}
 		}	break;