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1 /*
2     SDL - Simple DirectMedia Layer
3     Copyright (C) 1997-2012 Sam Lantinga
4 
5     This library is free software; you can redistribute it and/or
6     modify it under the terms of the GNU Lesser General Public
7     License as published by the Free Software Foundation; either
8     version 2.1 of the License, or (at your option) any later version.
9 
10     This library is distributed in the hope that it will be useful,
11     but WITHOUT ANY WARRANTY; without even the implied warranty of
12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13     Lesser General Public License for more details.
14 
15     You should have received a copy of the GNU Lesser General Public
16     License along with this library; if not, write to the Free Software
17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
18 
19     Sam Lantinga
20     slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23 
24 /* Useful variables and functions from SDL_cursor.c */
25 #include "SDL_mouse.h"
26 
27 extern int  SDL_CursorInit(Uint32 flags);
28 extern void SDL_CursorPaletteChanged(void);
29 extern void SDL_DrawCursor(SDL_Surface *screen);
30 extern void SDL_DrawCursorNoLock(SDL_Surface *screen);
31 extern void SDL_EraseCursor(SDL_Surface *screen);
32 extern void SDL_EraseCursorNoLock(SDL_Surface *screen);
33 extern void SDL_UpdateCursor(SDL_Surface *screen);
34 extern void SDL_ResetCursor(void);
35 extern void SDL_MoveCursor(int x, int y);
36 extern void SDL_CursorQuit(void);
37 
38 #define INLINE_MOUSELOCK
39 #ifdef INLINE_MOUSELOCK
40 /* Inline (macro) versions of the mouse lock functions */
41 #include "SDL_mutex.h"
42 
43 extern SDL_mutex *SDL_cursorlock;
44 
45 #define SDL_LockCursor()						\
46 	do {								\
47 		if ( SDL_cursorlock ) {					\
48 			SDL_mutexP(SDL_cursorlock);			\
49 		}							\
50 	} while ( 0 )
51 #define SDL_UnlockCursor()						\
52 	do {								\
53 		if ( SDL_cursorlock ) {					\
54 			SDL_mutexV(SDL_cursorlock);			\
55 		}							\
56 	} while ( 0 )
57 #else
58 extern void SDL_LockCursor(void);
59 extern void SDL_UnlockCursor(void);
60 #endif /* INLINE_MOUSELOCK */
61 
62 /* Only for low-level mouse cursor drawing */
63 extern SDL_Cursor *SDL_cursor;
64 extern void SDL_MouseRect(SDL_Rect *area);
65 
66 /* State definitions for the SDL cursor */
67 #define CURSOR_VISIBLE	0x01
68 #define CURSOR_USINGSW	0x10
69 #define SHOULD_DRAWCURSOR(X) 						\
70 			(((X)&(CURSOR_VISIBLE|CURSOR_USINGSW)) ==  	\
71 					(CURSOR_VISIBLE|CURSOR_USINGSW))
72 
73 extern volatile int SDL_cursorstate;
74