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annotate 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
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include "SDL_ph_video.h"
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29
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30 extern int ph_SetupImage(_THIS, SDL_Surface *screen);
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31 extern void ph_DestroyImage(_THIS, SDL_Surface *screen);
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32 extern int ph_SetupUpdateFunction(_THIS, SDL_Surface *screen, Uint32 flags);
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34 extern int ph_AllocHWSurface(_THIS, SDL_Surface *surface);
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35 extern void ph_FreeHWSurface(_THIS, SDL_Surface *surface);
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36 extern int ph_LockHWSurface(_THIS, SDL_Surface *surface);
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37 extern void ph_UnlockHWSurface(_THIS, SDL_Surface *surface);
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38 extern int ph_FlipHWSurface(_THIS, SDL_Surface *surface);
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39
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40 extern void ph_NormalUpdate(_THIS, int numrects, SDL_Rect *rects);
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41 extern void ph_OCUpdate(_THIS, int numrects, SDL_Rect *rects);
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42 extern void ph_OCDCUpdate(_THIS, int numrects, SDL_Rect *rects);
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68a8a8237c09 Date: Thu, 21 Feb 2002 09:18:24 +0200
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43 extern void ph_OpenGLUpdate(_THIS, int numrects, SDL_Rect *rects);