Mercurial > sdl-ios-xcode
annotate src/video/wincommon/SDL_sysmouse.c @ 4355:9b464226e541 SDL-1.2
Fixed bug #855
Ludwig Nussel 2009-10-18 06:31:52 PDT
an mprotect call was added to fix bug 528. However that results in a buffer
that allows writing and code execution. Ie the no-execute security features of
modern operating systems are defeated this way. Two mprotect calls are needed.
One to make the buffer executable but not writeable when done and another one
to make the buffer writeable again if the content needs to be changed.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 18 Oct 2009 17:31:37 +0000 |
| parents | a6f635e5eaa6 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
| 0 | 4 |
| 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 Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
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24 #define WIN32_LEAN_AND_MEAN |
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25 #include <windows.h> |
| 0 | 26 |
| 27 #include "SDL_mouse.h" | |
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28 #include "../../events/SDL_events_c.h" |
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29 #include "../SDL_cursor_c.h" |
| 0 | 30 #include "SDL_sysmouse_c.h" |
| 31 #include "SDL_lowvideo.h" | |
| 32 | |
| 33 #ifdef _WIN32_WCE | |
| 34 #define USE_STATIC_CURSOR | |
| 35 #endif | |
| 36 | |
| 37 HCURSOR SDL_hcursor = NULL; /* Exported for SDL_eventloop.c */ | |
| 38 | |
| 39 /* The implementation dependent data for the window manager cursor */ | |
| 40 /* For some reason when creating a windows cursor, the ands and xors memory | |
| 41 is not copied, so we need to keep track of it and free it when we are done | |
| 42 with the cursor. If we free the memory prematurely, the app crashes. :-} | |
| 43 */ | |
| 44 struct WMcursor { | |
| 45 HCURSOR curs; | |
| 46 #ifndef USE_STATIC_CURSOR | |
| 47 Uint8 *ands; | |
| 48 Uint8 *xors; | |
| 49 #endif | |
| 50 }; | |
| 51 | |
| 52 /* Convert bits to padded bytes */ | |
| 53 #define PAD_BITS(bits) ((bits+7)/8) | |
| 54 | |
| 55 #ifdef CURSOR_DEBUG | |
| 56 static void PrintBITMAP(FILE *out, char *bits, int w, int h) | |
| 57 { | |
| 58 int i; | |
| 59 unsigned char ch; | |
| 60 | |
| 61 while ( h-- > 0 ) { | |
| 62 for ( i=0; i<w; ++i ) { | |
| 63 if ( (i%8) == 0 ) | |
| 64 ch = *bits++; | |
| 65 if ( ch&0x80 ) | |
| 66 fprintf(out, "X"); | |
| 67 else | |
| 68 fprintf(out, " "); | |
| 69 ch <<= 1; | |
| 70 } | |
| 71 fprintf(out, "\n"); | |
| 72 } | |
| 73 } | |
| 74 #endif | |
| 75 | |
| 76 #ifndef USE_STATIC_CURSOR | |
| 77 /* Local functions to convert the SDL cursor mask into Windows format */ | |
| 78 static void memnot(Uint8 *dst, Uint8 *src, int len) | |
| 79 { | |
| 80 while ( len-- > 0 ) | |
| 81 *dst++ = ~*src++; | |
| 82 } | |
| 83 static void memxor(Uint8 *dst, Uint8 *src1, Uint8 *src2, int len) | |
| 84 { | |
| 85 while ( len-- > 0 ) | |
| 86 *dst++ = (*src1++)^(*src2++); | |
| 87 } | |
| 88 #endif /* !USE_STATIC_CURSOR */ | |
| 89 | |
| 90 void WIN_FreeWMCursor(_THIS, WMcursor *cursor) | |
| 91 { | |
| 92 #ifndef USE_STATIC_CURSOR | |
|
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Fixed cursor resource leak in Windows (thanks Huib-Jan Imbens!)
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93 if ( cursor->curs == GetCursor() ) |
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94 SetCursor(NULL); |
| 0 | 95 if ( cursor->curs != NULL ) |
| 96 DestroyCursor(cursor->curs); | |
| 97 if ( cursor->ands != NULL ) | |
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98 SDL_free(cursor->ands); |
| 0 | 99 if ( cursor->xors != NULL ) |
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100 SDL_free(cursor->xors); |
| 0 | 101 #endif /* !USE_STATIC_CURSOR */ |
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102 SDL_free(cursor); |
| 0 | 103 } |
| 104 | |
| 105 WMcursor *WIN_CreateWMCursor(_THIS, | |
| 106 Uint8 *data, Uint8 *mask, int w, int h, int hot_x, int hot_y) | |
| 107 { | |
| 108 #ifdef USE_STATIC_CURSOR | |
| 109 WMcursor *cursor; | |
| 110 | |
| 111 /* Allocate the cursor */ | |
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112 cursor = (WMcursor *)SDL_malloc(sizeof(*cursor)); |
| 0 | 113 if ( cursor ) { |
| 114 cursor->curs = LoadCursor(NULL, IDC_ARROW); | |
| 115 } | |
| 116 return(cursor); | |
| 117 #else | |
| 118 WMcursor *cursor; | |
| 119 int allowed_x; | |
| 120 int allowed_y; | |
| 121 int run, pad, i; | |
| 122 Uint8 *aptr, *xptr; | |
| 123 | |
| 124 /* Check to make sure the cursor size is okay */ | |
| 125 allowed_x = GetSystemMetrics(SM_CXCURSOR); | |
| 126 allowed_y = GetSystemMetrics(SM_CYCURSOR); | |
| 127 if ( (w > allowed_x) || (h > allowed_y) ) { | |
| 128 SDL_SetError("Only cursors of dimension (%dx%d) are allowed", | |
| 129 allowed_x, allowed_y); | |
| 130 return(NULL); | |
| 131 } | |
| 132 | |
| 133 /* Allocate the cursor */ | |
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134 cursor = (WMcursor *)SDL_malloc(sizeof(*cursor)); |
| 0 | 135 if ( cursor == NULL ) { |
| 136 SDL_SetError("Out of memory"); | |
| 137 return(NULL); | |
| 138 } | |
| 139 cursor->curs = NULL; | |
| 140 cursor->ands = NULL; | |
| 141 cursor->xors = NULL; | |
| 142 | |
| 143 /* Pad out to the normal cursor size */ | |
| 144 run = PAD_BITS(w); | |
| 145 pad = PAD_BITS(allowed_x)-run; | |
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146 aptr = cursor->ands = (Uint8 *)SDL_malloc((run+pad)*allowed_y); |
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parents:
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147 xptr = cursor->xors = (Uint8 *)SDL_malloc((run+pad)*allowed_y); |
| 0 | 148 if ( (aptr == NULL) || (xptr == NULL) ) { |
| 149 WIN_FreeWMCursor(NULL, cursor); | |
| 150 SDL_OutOfMemory(); | |
| 151 return(NULL); | |
| 152 } | |
| 153 for ( i=0; i<h; ++i ) { | |
| 154 memxor(xptr, data, mask, run); | |
| 155 xptr += run; | |
| 156 data += run; | |
| 157 memnot(aptr, mask, run); | |
| 158 mask += run; | |
| 159 aptr += run; | |
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160 SDL_memset(xptr, 0, pad); |
| 0 | 161 xptr += pad; |
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162 SDL_memset(aptr, ~0, pad); |
| 0 | 163 aptr += pad; |
| 164 } | |
| 165 pad += run; | |
| 166 for ( ; i<allowed_y; ++i ) { | |
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167 SDL_memset(xptr, 0, pad); |
| 0 | 168 xptr += pad; |
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parents:
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169 SDL_memset(aptr, ~0, pad); |
| 0 | 170 aptr += pad; |
| 171 } | |
| 172 | |
| 173 /* Create the cursor */ | |
| 174 cursor->curs = CreateCursor( | |
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175 (HINSTANCE)GetWindowLongPtr(SDL_Window, GWLP_HINSTANCE), |
| 0 | 176 hot_x, hot_y, allowed_x, allowed_y, |
| 177 cursor->ands, cursor->xors); | |
| 178 if ( cursor->curs == NULL ) { | |
| 179 WIN_FreeWMCursor(NULL, cursor); | |
| 180 SDL_SetError("Windows couldn't create the requested cursor"); | |
| 181 return(NULL); | |
| 182 } | |
| 183 return(cursor); | |
| 184 #endif /* USE_STATIC_CURSOR */ | |
| 185 } | |
| 186 | |
| 187 int WIN_ShowWMCursor(_THIS, WMcursor *cursor) | |
| 188 { | |
| 189 POINT mouse_pos; | |
| 190 | |
| 4167 | 191 if ( !this->screen ) { |
| 0 | 192 return(0); |
| 193 } | |
| 194 | |
| 195 /* Set the window cursor to our cursor, if applicable */ | |
| 196 if ( cursor != NULL ) { | |
| 197 SDL_hcursor = cursor->curs; | |
| 198 } else { | |
| 199 SDL_hcursor = NULL; | |
| 200 } | |
| 201 GetCursorPos(&mouse_pos); | |
| 202 if ( PtInRect(&SDL_bounds, mouse_pos) ) { | |
| 203 SetCursor(SDL_hcursor); | |
| 204 } | |
| 205 return(1); | |
| 206 } | |
| 207 | |
| 208 void WIN_WarpWMCursor(_THIS, Uint16 x, Uint16 y) | |
| 209 { | |
| 4167 | 210 if ( mouse_relative) { |
| 0 | 211 /* RJR: March 28, 2000 |
| 212 leave physical cursor at center of screen if | |
| 213 mouse hidden and grabbed */ | |
| 214 SDL_PrivateMouseMotion(0, 0, x, y); | |
| 215 } else { | |
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Fixed mouse warp position bug with offset video modes
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216 POINT pt; |
| 4167 | 217 |
| 218 /* With DirectInput the position doesn't follow | |
| 219 * the cursor, so it is set manually */ | |
| 220 if ( DINPUT() ) { | |
| 221 SDL_PrivateMouseMotion(0, 0, x, y); | |
| 222 } | |
| 223 | |
| 0 | 224 pt.x = x; |
| 225 pt.y = y; | |
| 226 ClientToScreen(SDL_Window, &pt); | |
| 227 SetCursorPos(pt.x, pt.y); | |
| 228 } | |
| 229 } | |
| 230 | |
| 231 /* Update the current mouse state and position */ | |
| 232 void WIN_UpdateMouse(_THIS) | |
| 233 { | |
| 234 POINT pt; | |
| 235 | |
| 4167 | 236 /* Always unset SDL_APPMOUSEFOCUS to give the WM_MOUSEMOVE event |
| 237 * handler a chance to install a TRACKMOUSEEVENT */ | |
| 238 SDL_PrivateAppActive(0, SDL_APPMOUSEFOCUS); | |
| 239 | |
| 240 GetCursorPos(&pt); | |
| 241 ScreenToClient(SDL_Window, &pt); | |
| 242 SDL_PrivateMouseMotion(0,0, (Sint16)pt.x, (Sint16)pt.y); | |
| 0 | 243 } |
| 244 | |
| 245 /* Check to see if we need to enter or leave mouse relative mode */ | |
| 246 void WIN_CheckMouseMode(_THIS) | |
| 247 { | |
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248 #ifndef _WIN32_WCE |
| 0 | 249 /* If the mouse is hidden and input is grabbed, we use relative mode */ |
| 250 if ( !(SDL_cursorstate & CURSOR_VISIBLE) && | |
| 251 (this->input_grab != SDL_GRAB_OFF) ) { | |
| 252 mouse_relative = 1; | |
| 253 } else { | |
| 254 mouse_relative = 0; | |
| 255 } | |
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256 #else |
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257 mouse_relative = 0; |
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258 #endif |
| 0 | 259 } |