view src/video/SDL_cursor_c.h @ 4168:69bcba65c388 SDL-1.2

Fixed bug #526 Comment #1 From Simon Howard 2009-03-20 16:50:56 Hi, I'm the author of Chocolate Doom, one of the other source ports that James mentioned. This is a patch against the current SVN version of SDL 1.2 that fixes the bug. It has been tested and hopefully should be obviously correct from examining the changes. I'll give a brief explanation. When the palette is set with SDL_SetPalette, the IDirectDrawPalette_SetEntries DirectX function is invoked. However, when this happens, a WM_PALETTECHANGED message is sent to the window. A WM_PALETTECHANGED message can also be received if the palette is changed for some other reason, like if the system palette is changed. Therefore, the palette change handler (DX5_PaletteChanged) has code to deal with this case. It distinguishes "expected" palette changes (set with SDL_SetPalette) from "unexpected" palette changes using the colorchange_expected variable, which is set before calling IDirectDrawPalette_SetEntries. However, the code to set this variable is missing in the fullscreen code path. By setting this variable, the palette change is handled properly and the freezes go away.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 13 Apr 2009 00:53:12 +0000
parents a1b03ba2fcd0
children
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* Useful variables and functions from SDL_cursor.c */
#include "SDL_mouse.h"

extern int  SDL_CursorInit(Uint32 flags);
extern void SDL_CursorPaletteChanged(void);
extern void SDL_DrawCursor(SDL_Surface *screen);
extern void SDL_DrawCursorNoLock(SDL_Surface *screen);
extern void SDL_EraseCursor(SDL_Surface *screen);
extern void SDL_EraseCursorNoLock(SDL_Surface *screen);
extern void SDL_UpdateCursor(SDL_Surface *screen);
extern void SDL_ResetCursor(void);
extern void SDL_MoveCursor(int x, int y);
extern void SDL_CursorQuit(void);

#define INLINE_MOUSELOCK
#ifdef INLINE_MOUSELOCK
/* Inline (macro) versions of the mouse lock functions */
#include "SDL_mutex.h"

extern SDL_mutex *SDL_cursorlock;

#define SDL_LockCursor()						\
	do {								\
		if ( SDL_cursorlock ) {					\
			SDL_mutexP(SDL_cursorlock);			\
		}							\
	} while ( 0 )
#define SDL_UnlockCursor()						\
	do {								\
		if ( SDL_cursorlock ) {					\
			SDL_mutexV(SDL_cursorlock);			\
		}							\
	} while ( 0 )
#else
extern void SDL_LockCursor(void);
extern void SDL_UnlockCursor(void);
#endif /* INLINE_MOUSELOCK */

/* Only for low-level mouse cursor drawing */
extern SDL_Cursor *SDL_cursor;
extern void SDL_MouseRect(SDL_Rect *area);

/* State definitions for the SDL cursor */
#define CURSOR_VISIBLE	0x01
#define CURSOR_USINGSW	0x10
#define SHOULD_DRAWCURSOR(X) 						\
			(((X)&(CURSOR_VISIBLE|CURSOR_USINGSW)) ==  	\
					(CURSOR_VISIBLE|CURSOR_USINGSW))

extern volatile int SDL_cursorstate;