Index: ogl_bitmap.c
===================================================================
--- ogl_bitmap.c	(revision 15577)
+++ ogl_bitmap.c	(working copy)
@@ -1,5 +1,5 @@
 /*         ______   ___    ___
- *        /\  _  \ /\_ \  /\_ \ 
+ *        /\  _  \ /\_ \  /\_ \
  *        \ \ \L\ \\//\ \ \//\ \      __     __   _ __   ___ 
  *         \ \  __ \ \ \ \  \ \ \   /'__`\ /'_ `\/\`'__\/ __`\
  *          \ \ \/\ \ \_\ \_ \_\ \_/\  __//\ \L\ \ \ \//\ \L\ \
@@ -200,8 +200,8 @@
     float sx, float sy, float sw, float sh,
     int flags)
 {
-   float tex_l, tex_t, tex_r, tex_b, w, h, tex_w, tex_h;
-   float dw = sw, dh = sh;
+   double tex_l, tex_t, tex_r, tex_b, w, h, true_w, true_h;
+   double dw = sw, dh = sh;
    ALLEGRO_BITMAP_EXTRA_OPENGL *ogl_bitmap = bitmap->extra;
    ALLEGRO_OGL_BITMAP_VERTEX *verts;
    ALLEGRO_DISPLAY *disp = al_get_current_display();
@@ -222,13 +222,13 @@
 
    w = bitmap->w;
    h = bitmap->h;
-   tex_w = 1.0 / ogl_bitmap->true_w;
-   tex_h = 1.0 / ogl_bitmap->true_h;
+   true_w = ogl_bitmap->true_w;
+   true_h = ogl_bitmap->true_h;
 
-   tex_l += sx * tex_w;
-   tex_t -= sy * tex_h;
-   tex_r -= (w - sx - sw) * tex_w;
-   tex_b += (h - sy - sh) * tex_h;
+   tex_l += sx / true_w;
+   tex_t -= sy / true_h;
+   tex_r -= (w - sx - sw) / true_w;
+   tex_b += (h - sy - sh) / true_h;
 
    verts[0].x = 0;
    verts[0].y = dh;
@@ -519,10 +519,10 @@
       }
    }
 
-   ogl_bitmap->left = 0;
-   ogl_bitmap->right = (float) w / ogl_bitmap->true_w;
-   ogl_bitmap->top = (float) h / ogl_bitmap->true_h;
-   ogl_bitmap->bottom = 0;
+   ogl_bitmap->left = 0.5 / ogl_bitmap->true_w;
+   ogl_bitmap->right = (float)(w-0.5) / ogl_bitmap->true_w;
+   ogl_bitmap->top = (float)(h-0.5) / ogl_bitmap->true_h;
+   ogl_bitmap->bottom = 0.5 / ogl_bitmap->true_h;
 
    return true;
 }