src/video/x11/SDL_x11mouse.c
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FUNCTIONS
This source file includes following functions.
- X11_FreeWMCursor
- X11_CreateWMCursor
- X11_ShowWMCursor
- X11_WarpWMCursor
- SetMouseAccel
- X11_CheckMouseModeNoLock
- X11_CheckMouseMode
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id: SDL_x11mouse.c,v 1.4.2.13 2001/02/10 07:20:15 hercules Exp $";
26 #endif
27
28 #include <stdlib.h>
29 #include <stdio.h>
30 #include <string.h>
31
32 #include <X11/Xlib.h>
33 #include <X11/Xutil.h>
34
35 #include "SDL_error.h"
36 #include "SDL_mouse.h"
37 #include "SDL_events_c.h"
38 #include "SDL_cursor_c.h"
39 #include "SDL_x11dga_c.h"
40 #include "SDL_x11mouse_c.h"
41
42
43 /* The implementation dependent data for the window manager cursor */
44 struct WMcursor {
45 Cursor x_cursor;
46 };
47
48
49 void X11_FreeWMCursor(_THIS, WMcursor *cursor)
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50 {
51 if ( SDL_Display != NULL ) {
52 SDL_Lock_EventThread();
53 XFreeCursor(SDL_Display, cursor->x_cursor);
54 XSync(SDL_Display, False);
55 SDL_Unlock_EventThread();
56 }
57 free(cursor);
58 }
59
60 WMcursor *X11_CreateWMCursor(_THIS,
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61 Uint8 *data, Uint8 *mask, int w, int h, int hot_x, int hot_y)
62 {
63 WMcursor *cursor;
64 XGCValues GCvalues;
65 GC GCcursor;
66 XImage *data_image, *mask_image;
67 Pixmap data_pixmap, mask_pixmap;
68 int clen, i;
69 char *x_data, *x_mask;
70 static XColor black = { 0, 0, 0, 0 };
71 static XColor white = { 0xffff, 0xffff, 0xffff, 0xffff };
72
73 /* Allocate the cursor memory */
74 cursor = (WMcursor *)malloc(sizeof(WMcursor));
75 if ( cursor == NULL ) {
76 SDL_OutOfMemory();
77 return(NULL);
78 }
79
80 /* Mix the mask and the data */
81 clen = (w/8)*h;
82 x_data = (char *)malloc(clen);
83 if ( x_data == NULL ) {
84 free(cursor);
85 SDL_OutOfMemory();
86 return(NULL);
87 }
88 x_mask = (char *)malloc(clen);
89 if ( x_mask == NULL ) {
90 free(cursor);
91 free(x_data);
92 SDL_OutOfMemory();
93 return(NULL);
94 }
95 for ( i=0; i<clen; ++i ) {
96 /* The mask is OR'd with the data to turn inverted color
97 pixels black since inverted color cursors aren't supported
98 under X11.
99 */
100 x_mask[i] = data[i] | mask[i];
101 x_data[i] = data[i];
102 }
103
104 /* Prevent the event thread from running while we use the X server */
105 SDL_Lock_EventThread();
106
107 /* Create the data image */
108 data_image = XCreateImage(SDL_Display,
109 DefaultVisual(SDL_Display, SDL_Screen),
110 1, XYBitmap, 0, x_data, w, h, 8, w/8);
111 data_image->byte_order = MSBFirst;
112 data_image->bitmap_bit_order = MSBFirst;
113 data_pixmap = XCreatePixmap(SDL_Display, SDL_Root, w, h, 1);
114
115 /* Create the data mask */
116 mask_image = XCreateImage(SDL_Display,
117 DefaultVisual(SDL_Display, SDL_Screen),
118 1, XYBitmap, 0, x_mask, w, h, 8, w/8);
119 mask_image->byte_order = MSBFirst;
120 mask_image->bitmap_bit_order = MSBFirst;
121 mask_pixmap = XCreatePixmap(SDL_Display, SDL_Root, w, h, 1);
122
123 /* Create the graphics context */
124 GCvalues.function = GXcopy;
125 GCvalues.foreground = ~0;
126 GCvalues.background = 0;
127 GCvalues.plane_mask = AllPlanes;
128 GCcursor = XCreateGC(SDL_Display, data_pixmap,
129 (GCFunction|GCForeground|GCBackground|GCPlaneMask),
130 &GCvalues);
131
132 /* Blit the images to the pixmaps */
133 XPutImage(SDL_Display, data_pixmap, GCcursor, data_image,
134 0, 0, 0, 0, w, h);
135 XPutImage(SDL_Display, mask_pixmap, GCcursor, mask_image,
136 0, 0, 0, 0, w, h);
137 XFreeGC(SDL_Display, GCcursor);
138 /* These free the x_data and x_mask memory pointers */
139 XDestroyImage(data_image);
140 XDestroyImage(mask_image);
141
142 /* Create the cursor */
143 cursor->x_cursor = XCreatePixmapCursor(SDL_Display, data_pixmap,
144 mask_pixmap, &black, &white, hot_x, hot_y);
145
146 /* Release the event thread */
147 XSync(SDL_Display, False);
148 SDL_Unlock_EventThread();
149
150 return(cursor);
151 }
152
153 int X11_ShowWMCursor(_THIS, WMcursor *cursor)
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154 {
155 /* Don't do anything if the display is gone */
156 if ( SDL_Display == NULL ) {
157 return(0);
158 }
159
160 /* Set the X11 cursor cursor, or blank if cursor is NULL */
161 if ( SDL_Window ) {
162 SDL_Lock_EventThread();
163 if ( cursor == NULL ) {
164 if ( SDL_BlankCursor != NULL ) {
165 XDefineCursor(SDL_Display, SDL_Window,
166 SDL_BlankCursor->x_cursor);
167 }
168 } else {
169 XDefineCursor(SDL_Display, SDL_Window, cursor->x_cursor);
170 }
171 XSync(SDL_Display, False);
172 SDL_Unlock_EventThread();
173 }
174 return(1);
175 }
176
177 void X11_WarpWMCursor(_THIS, Uint16 x, Uint16 y)
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178 {
179 if ( using_dga & DGA_MOUSE ) {
180 x += (this->screen->offset % this->screen->pitch) /
181 this->screen->format->BytesPerPixel;
182 y += (this->screen->offset / this->screen->pitch);
183 SDL_PrivateMouseMotion(0, 0, x, y);
184 } else {
185 SDL_Lock_EventThread();
186 XWarpPointer(SDL_Display, None, SDL_Window, 0, 0, 0, 0, x, y);
187 XSync(SDL_Display, False);
188 SDL_Unlock_EventThread();
189 }
190 }
191
192 /* Sets the mouse acceleration from a string of the form:
193 2/1/0
194 The first number is the numerator, followed by the acceleration
195 denumenator and threshold.
196 */
197 static void SetMouseAccel(_THIS, const char *accel_param)
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198 {
199 int i;
200 int accel_value[3];
201 char *mouse_param, *mouse_param_buf, *pin;
202
203 mouse_param_buf = (char *)malloc(strlen(accel_param)+1);
204 if ( ! mouse_param_buf ) {
205 return;
206 }
207 strcpy(mouse_param_buf, accel_param);
208 mouse_param = mouse_param_buf;
209
210 for ( i=0; (i < 3) && mouse_param; ++i ) {
211 pin = strchr(mouse_param, '/');
212 if ( pin ) {
213 *pin = '\0';
214 }
215 accel_value[i] = atoi(mouse_param);
216 if ( pin ) {
217 mouse_param = pin+1;
218 } else {
219 mouse_param = NULL;
220 }
221 }
222 if ( mouse_param_buf ) {
223 XChangePointerControl(SDL_Display, True, True,
224 accel_value[0], accel_value[1], accel_value[2]);
225 free(mouse_param_buf);
226 }
227 }
228
229 /* Check to see if we need to enter or leave mouse relative mode */
230 void X11_CheckMouseModeNoLock(_THIS)
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231 {
232 /* If the mouse is hidden and input is grabbed, we use relative mode */
233 if ( !(SDL_cursorstate & CURSOR_VISIBLE) &&
234 (this->input_grab != SDL_GRAB_OFF) &&
235 (SDL_GetAppState() & SDL_APPACTIVE) ) {
236 if ( ! mouse_relative ) {
237 X11_EnableDGAMouse(this);
238 if ( ! (using_dga & DGA_MOUSE) ) {
239 char *xmouse_accel;
240
241 SDL_GetMouseState(&mouse_last.x, &mouse_last.y);
242 /* Use as raw mouse mickeys as possible */
243 XGetPointerControl(SDL_Display,
244 &mouse_accel.numerator,
245 &mouse_accel.denominator,
246 &mouse_accel.threshold);
247 xmouse_accel=getenv("SDL_VIDEO_X11_MOUSEACCEL");
248 if ( xmouse_accel ) {
249 SetMouseAccel(this, xmouse_accel);
250 }
251 }
252 mouse_relative = 1;
253 }
254 } else {
255 if ( mouse_relative ) {
256 if ( using_dga & DGA_MOUSE ) {
257 X11_DisableDGAMouse(this);
258 } else {
259 XChangePointerControl(SDL_Display, True, True,
260 mouse_accel.numerator,
261 mouse_accel.denominator,
262 mouse_accel.threshold);
263 }
264 mouse_relative = 0;
265 }
266 }
267 }
268 void X11_CheckMouseMode(_THIS)
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269 {
270 SDL_Lock_EventThread();
271 X11_CheckMouseModeNoLock(this);
272 SDL_Unlock_EventThread();
273 }