From f2357f5596083f8fa1fa475bee5191e2810c39ff Mon Sep 17 00:00:00 2001
From: Eric Smith <spacewar@gmail.com>
Date: Tue, 1 Jan 2002 10:18:33 +0000
Subject: [PATCH] change coordinates to signed.

---
 bitblt.c | 7 ++++---
 bitblt.h | 4 ++--
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/bitblt.c b/bitblt.c
index f35f957..2701e32 100644
--- a/bitblt.c
+++ b/bitblt.c
@@ -50,7 +50,8 @@ void free_bitmap (Bitmap *bitmap)
 boolean get_pixel (Bitmap *bitmap, Point coord)
 {
   u8 *p;
-  if ((coord.x >= bitmap->width) || (coord.y >= bitmap->height))
+  if ((coord.x < 0) || (coord.y < 0) ||
+      (coord.x >= bitmap->width) || (coord.y >= bitmap->height))
     return (0);
   p = bitmap->bits + coord.y * bitmap->rowbytes + coord.x / 8;
   return ((*p & pixel_mask (coord.x & 7)) != 0);
@@ -59,7 +60,8 @@ boolean get_pixel (Bitmap *bitmap, Point coord)
 void set_pixel (Bitmap *bitmap, Point coord, boolean value)
 {
   u8 *p;
-  if ((coord.x >= bitmap->width) || (coord.y >= bitmap->height))
+  if ((coord.x < 0) || (coord.y < 0) ||
+      (coord.x >= bitmap->width) || (coord.y >= bitmap->height))
     return;
   p = bitmap->bits + coord.y * bitmap->rowbytes + coord.x / 8;
   if (value)
@@ -77,7 +79,6 @@ Bitmap *bitblt (Bitmap *src_bitmap,
 		int tfn)
 {
   Point src_point, dest_point;
-  boolean src_pixel, dest_pixel;
 
   if (! dest_bitmap)
     {
diff --git a/bitblt.h b/bitblt.h
index d78c8b5..a8f4c06 100644
--- a/bitblt.h
+++ b/bitblt.h
@@ -1,7 +1,7 @@
 typedef struct Point
 {
-  u32 x;
-  u32 y;
+  int x;
+  int y;
 } Point;
 
 typedef struct Rect