+ /* XXX: SDL sometimes generates nul events: we delete them */
+ if (dx == 0 && dy == 0 && dz == 0 && buttons_state == 0)
+ return;
+ MS_DPRINTF("dx=%d dy=%d buttons=%01x\n", dx, dy, buttons_state);
+
+ ch = 0x80 | 0x7; /* protocol start byte, no buttons pressed */
+
+ if (buttons_state & MOUSE_EVENT_LBUTTON)
+ ch ^= 0x4;
+ if (buttons_state & MOUSE_EVENT_MBUTTON)
+ ch ^= 0x2;
+ if (buttons_state & MOUSE_EVENT_RBUTTON)
+ ch ^= 0x1;
+
+ put_queue(s, ch);
+
+ ch = dx;
+
+ if (ch > 127)
+ ch=127;
+ else if (ch < -127)
+ ch=-127;
+
+ put_queue(s, ch & 0xff);
+
+ ch = -dy;
+
+ if (ch > 127)
+ ch=127;
+ else if (ch < -127)
+ ch=-127;
+
+ put_queue(s, ch & 0xff);
+
+ // MSC protocol specify two extra motion bytes
+
+ put_queue(s, 0);
+ put_queue(s, 0);