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view src/video/photon/SDL_ph_image_c.h @ 688:c0522010bb6d

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Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST) From: "Mattias Engdeg?rd" Subject: bug in SDL_GetRGB/GetRGBA There's an embarrassing bug in GetRGB/GetRGBA which apparently has been there for years. It incorrectly converts colours with < 8 bits/channel. It came to my attention today in #sdl. What it does now is (for each channel): rv = (pixel & fmt->Rmask) >> fmt->Rshift; *r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss)); which is wrong; the last line should be *r = (rv << fmt->Rloss) + (rv >> (8 - (fmt->Rloss << 1)));
author Sam Lantinga <slouken@libsdl.org>
date Tue, 12 Aug 2003 15:17:20 +0000
parents 8bedd6d61642
children aaf3b8af6616
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

#include "SDL_ph_video.h"

extern int ph_SetupImage(_THIS, SDL_Surface *screen);
extern void ph_DestroyImage(_THIS, SDL_Surface *screen);
extern int ph_SetupUpdateFunction(_THIS, SDL_Surface *screen, Uint32 flags);

extern int ph_AllocHWSurface(_THIS, SDL_Surface *surface);
extern void ph_FreeHWSurface(_THIS, SDL_Surface *surface);
extern int ph_LockHWSurface(_THIS, SDL_Surface *surface);
extern void ph_UnlockHWSurface(_THIS, SDL_Surface *surface);
extern int ph_FlipHWSurface(_THIS, SDL_Surface *surface);

extern void ph_NormalUpdate(_THIS, int numrects, SDL_Rect *rects);
extern void ph_OCUpdate(_THIS, int numrects, SDL_Rect *rects);
extern void ph_OCDCUpdate(_THIS, int numrects, SDL_Rect *rects);
extern void ph_OpenGLUpdate(_THIS, int numrects, SDL_Rect *rects);