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      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2006 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 (at) 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