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From: "Alex Volkov" Date: Thu, 10 Nov 2005 21:53:40 -0500 Subject: [SDL] BUG[?]: 32bpp RGBA->RGB colorkey blit, no SDL_SRCALPHA It seems there is either a documentation vs. reality mismatch or a real bug in SDL_blit_N.c:BlitNtoNKey(). The exact blit in question is a 32bpp RGBA->RGB, where RGBA has SDL_COLORKEY and *no* SDL_SRCALPHA flags. The doc in SDL_video.h states: * RGBA->RGB: * SDL_SRCALPHA not set: * copy RGB. * if SDL_SRCCOLORKEY set, only copy the pixels matching the * RGB values of the source colour key, ignoring alpha in the * comparison. BlitNtoNKey(), however, forgets to "ignore alpha in the comparison". The documentation makes perfect sense, so I think it is the code that is faulty. The attached patch corrects the code.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:43:15 +0000
parents 30f189cdd82b
children
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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
*/

#ifndef _SDL_config_h
#define _SDL_config_h

#include "SDL_platform.h"

/* Add any platform that doesn't build using the configure system */
#if defined(__AMIGA__)
#include "SDL_config_amiga.h"
#elif defined(__DREAMCAST__)
#include "SDL_config_dreamcast.h"
#elif defined(__MACOS__)
#include "SDL_config_macos.h"
#elif defined(__MACOSX__)
#include "SDL_config_macosx.h"
#elif defined(__WIN32__)
#include "SDL_config_win32.h"
#elif defined(__OS2__)
#include "SDL_config_os2.h"
#else
/* This is the minimal configuration that can be used to build SDL */

#include <stdarg.h>

typedef signed char int8_t;
typedef unsigned char uint8_t;
typedef signed short int16_t;
typedef unsigned short uint16_t;
typedef signed int int32_t;
typedef unsigned int uint32_t;
typedef unsigned int size_t;
typedef unsigned long uintptr_t;

/* Enable the dummy audio driver (src/audio/dummy/\*.c) */
#define SDL_AUDIO_DRIVER_DUMMY	1

/* Enable the stub cdrom driver (src/cdrom/dummy/\*.c) */
#define SDL_CDROM_DISABLED	1

/* Enable the stub joystick driver (src/joystick/dummy/\*.c) */
#define SDL_JOYSTICK_DISABLED	1

/* Enable the stub shared object loader (src/loadso/dummy/\*.c) */
#define SDL_LOADSO_DISABLED	1

/* Enable the stub thread support (src/thread/generic/\*.c) */
#define SDL_THREADS_DISABLED	1

/* Enable the stub timer support (src/timer/dummy/\*.c) */
#define SDL_TIMERS_DISABLED	1

/* Enable the dummy video driver (src/video/dummy/\*.c) */
#define SDL_VIDEO_DRIVER_DUMMY	1

#endif /* platform config */

#endif /* _SDL_config_h */