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view src/video/SDL_pixels_c.h @ 4158:96ce26f24b01 SDL-1.2

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Date: Sun, 7 Sep 2008 15:17:00 +0200 From: c2woody@gmx.net Subject: [SDL] SDL 1.2 doube free/pointer zeroing missing Hello, this is about a crash/debug breakage for the current SDL 1.2 source tree (today's svn checkout, same problem in 1.2.13 and before as far as relevant). In some places memory is free()d but the associated pointer is not zeroed, leading to for example double free()s. For me this happened because SDL_StopEventThread() was executed twice (during restart of the subsystems), once for the close down in SDL_VideoQuit() and once at the startup, right at the beginning of SDL_StartEventLoop(). Thus the code SDL_DestroyMutex(SDL_EventQ.lock); (see SDL_events.c) was called twice and executed the SDL_free(mutex); twice as well, leading to a crash (msvc 64bit for which it was noticed). I've tried to check all other occurrences of SDL_free and similar code in msvc, see the attached patch (udiff against revision 4082). Non-windows only codepaths have neither been checked nor touched. Comments/ideas welcome. Attached patch: NULLifies some pointers after they have been free()d.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 12 Nov 2008 17:23:40 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 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 functions and variables from SDL_pixel.c */

#include "SDL_blit.h"

/* Pixel format functions */
extern SDL_PixelFormat *SDL_AllocFormat(int bpp,
		Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
extern SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp,
		Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
extern void SDL_FormatChanged(SDL_Surface *surface);
extern void SDL_FreeFormat(SDL_PixelFormat *format);

/* Blit mapping functions */
extern SDL_BlitMap *SDL_AllocBlitMap(void);
extern void SDL_InvalidateMap(SDL_BlitMap *map);
extern int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst);
extern void SDL_FreeBlitMap(SDL_BlitMap *map);

/* Miscellaneous functions */
extern Uint16 SDL_CalculatePitch(SDL_Surface *surface);
extern void SDL_DitherColors(SDL_Color *colors, int bpp);
extern Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b);
extern void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output, int ncolors);