Mercurial > sdl-ios-xcode
annotate include/SDL_syswm.h @ 688:c0522010bb6d
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 | 550bccdf04bd |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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Updated the headers with the correct e-mail address
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Include file for SDL custom system window manager hooks */ | |
| 29 | |
| 30 #ifndef _SDL_syswm_h | |
| 31 #define _SDL_syswm_h | |
| 32 | |
| 33 #include "SDL_version.h" | |
| 34 | |
| 35 #include "begin_code.h" | |
| 36 /* Set up for C function definitions, even when using C++ */ | |
| 37 #ifdef __cplusplus | |
| 38 extern "C" { | |
| 39 #endif | |
| 40 | |
| 41 /* Your application has access to a special type of event 'SDL_SYSWMEVENT', | |
| 42 which contains window-manager specific information and arrives whenever | |
| 43 an unhandled window event occurs. This event is ignored by default, but | |
| 44 you can enable it with SDL_EventState() | |
| 45 */ | |
| 46 #ifdef SDL_PROTOTYPES_ONLY | |
| 47 struct SDL_SysWMinfo; | |
| 48 typedef struct SDL_SysWMinfo SDL_SysWMinfo; | |
| 49 #else | |
| 50 | |
| 51 /* This is the structure for custom window manager events */ | |
|
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52 #if (defined(unix) || defined(__unix__) || defined(_AIX) || defined(__OpenBSD__)) && \ |
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Date: Sat, 24 Aug 2002 22:20:01 -0600
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53 (!defined(DISABLE_X11) && !defined(__CYGWIN32__) && !defined(ENABLE_NANOX)) |
| 0 | 54 /* AIX is unix, of course, but the native compiler CSet doesn't define unix */ |
| 55 #include <X11/Xlib.h> | |
| 56 #include <X11/Xatom.h> | |
| 57 | |
| 58 /* These are the various supported subsystems under UNIX */ | |
| 59 typedef enum { | |
| 60 SDL_SYSWM_X11 | |
| 61 } SDL_SYSWM_TYPE; | |
| 62 | |
| 63 /* The UNIX custom event structure */ | |
| 64 struct SDL_SysWMmsg { | |
| 65 SDL_version version; | |
| 66 SDL_SYSWM_TYPE subsystem; | |
| 67 union { | |
| 68 XEvent xevent; | |
| 69 } event; | |
| 70 }; | |
| 71 | |
| 72 /* The UNIX custom window manager information structure. | |
| 73 When this structure is returned, it holds information about which | |
| 74 low level system it is using, and will be one of SDL_SYSWM_TYPE. | |
| 75 */ | |
| 76 typedef struct { | |
| 77 SDL_version version; | |
| 78 SDL_SYSWM_TYPE subsystem; | |
| 79 union { | |
| 80 struct { | |
| 81 Display *display; /* The X11 display */ | |
| 82 Window window; /* The X11 display window */ | |
| 83 /* These locking functions should be called around | |
| 84 any X11 functions using the display variable. | |
| 85 They lock the event thread, so should not be | |
| 86 called around event functions or from event filters. | |
| 87 */ | |
| 88 void (*lock_func)(void); | |
| 89 void (*unlock_func)(void); | |
| 90 | |
| 91 /* Introduced in SDL 1.0.2 */ | |
| 92 Window fswindow; /* The X11 fullscreen window */ | |
| 93 Window wmwindow; /* The X11 managed input window */ | |
| 94 } x11; | |
| 95 } info; | |
| 96 } SDL_SysWMinfo; | |
| 97 | |
|
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98 #elif defined(ENABLE_NANOX) |
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99 #include <microwin/nano-X.h> |
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100 |
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101 /* The generic custom event structure */ |
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102 struct SDL_SysWMmsg { |
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103 SDL_version version; |
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104 int data; |
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105 }; |
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106 |
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107 /* The windows custom window manager information structure */ |
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108 typedef struct { |
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109 SDL_version version ; |
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110 GR_WINDOW_ID window ; /* The display window */ |
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111 } SDL_SysWMinfo; |
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112 |
| 0 | 113 #elif defined(WIN32) |
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114 #define WIN32_LEAN_AND_MEAN |
| 0 | 115 #include <windows.h> |
| 116 | |
| 117 /* The windows custom event structure */ | |
| 118 struct SDL_SysWMmsg { | |
| 119 SDL_version version; | |
| 120 HWND hwnd; /* The window for the message */ | |
| 121 UINT msg; /* The type of message */ | |
| 122 WPARAM wParam; /* WORD message parameter */ | |
| 123 LPARAM lParam; /* LONG message parameter */ | |
| 124 }; | |
| 125 | |
| 126 /* The windows custom window manager information structure */ | |
| 127 typedef struct { | |
| 128 SDL_version version; | |
| 129 HWND window; /* The Win32 display window */ | |
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130 HGLRC hglrc; /* The OpenGL context, if any */ |
| 0 | 131 } SDL_SysWMinfo; |
| 132 | |
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133 #elif defined(__riscos__) |
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134 |
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135 /* RISC OS custom event structure */ |
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136 struct SDL_SysWMmsg { |
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137 SDL_version version; |
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138 int eventCode; /* The window for the message */ |
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139 int pollBlock[64]; |
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140 }; |
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141 |
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142 /* The RISCOS custom window manager information structure */ |
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143 typedef struct { |
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144 SDL_version version; |
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145 int wimpVersion; /* Wimp version running under */ |
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146 int taskHandle; /* The RISCOS task handle */ |
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147 int window; /* The RISCOS display window */ |
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148 } SDL_SysWMinfo; |
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149 |
| 0 | 150 #else |
| 151 | |
| 152 /* The generic custom event structure */ | |
| 153 struct SDL_SysWMmsg { | |
| 154 SDL_version version; | |
| 155 int data; | |
| 156 }; | |
| 157 | |
| 158 /* The generic custom window manager information structure */ | |
| 159 typedef struct { | |
| 160 SDL_version version; | |
| 161 int data; | |
| 162 } SDL_SysWMinfo; | |
| 163 | |
| 164 #endif /* OS type */ | |
| 165 | |
| 166 #endif /* SDL_PROTOTYPES_ONLY */ | |
| 167 | |
| 168 /* Function prototypes */ | |
| 169 /* | |
| 170 * This function gives you custom hooks into the window manager information. | |
| 171 * It fills the structure pointed to by 'info' with custom information and | |
| 172 * returns 1 if the function is implemented. If it's not implemented, or | |
| 173 * the version member of the 'info' structure is invalid, it returns 0. | |
| 174 */ | |
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175 extern DECLSPEC int SDLCALL SDL_GetWMInfo(SDL_SysWMinfo *info); |
| 0 | 176 |
| 177 | |
| 178 /* Ends C function definitions when using C++ */ | |
| 179 #ifdef __cplusplus | |
| 180 } | |
| 181 #endif | |
| 182 #include "close_code.h" | |
| 183 | |
| 184 #endif /* _SDL_syswm_h */ |