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comparison src/video/x11/SDL_x11framebuffer.c @ 5185:073b86030262

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Added the X11 framebuffer implementation. Simple! :)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 04 Feb 2011 18:05:20 -0800
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children b530ef003506
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5184:d2652aafafbb 5185:073b86030262
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2009 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #include "SDL_x11video.h"
25 #include "SDL_x11framebuffer.h"
26
27
28 #ifndef NO_SHARED_MEMORY
29
30 /* Shared memory error handler routine */
31 static int shm_error;
32 static int (*X_handler)(Display *, XErrorEvent *) = NULL;
33 static int shm_errhandler(Display *d, XErrorEvent *e)
34 {
35 if ( e->error_code == BadAccess ) {
36 shm_error = True;
37 return(0);
38 } else
39 return(X_handler(d,e));
40 }
41
42 static SDL_bool have_mitshm(void)
43 {
44 /* Only use shared memory on local X servers */
45 if ( (SDL_strncmp(XDisplayName(NULL), ":", 1) == 0) ||
46 (SDL_strncmp(XDisplayName(NULL), "unix:", 5) == 0) ) {
47 return SDL_X11_HAVE_SHM;
48 }
49 return SDL_FALSE;
50 }
51
52 #endif /* !NO_SHARED_MEMORY */
53
54 int
55 X11_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format,
56 void ** pixels, int *pitch)
57 {
58 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
59 Display *display = data->videodata->display;
60 XGCValues gcv;
61 XVisualInfo vinfo;
62
63 /* Free the old framebuffer surface */
64 X11_DestroyWindowFramebuffer(_this, window);
65
66 /* Create the graphics context for drawing */
67 gcv.graphics_exposures = False;
68 data->gc = XCreateGC(display, data->xwindow, GCGraphicsExposures, &gcv);
69 if (!data->gc) {
70 SDL_SetError("Couldn't create graphics context");
71 return -1;
72 }
73
74 /* Find out the pixel format and depth */
75 if (X11_GetVisualInfoFromVisual(display, data->visual, &vinfo) < 0) {
76 SDL_SetError("Couldn't get window visual information");
77 return -1;
78 }
79
80 *format = X11_GetPixelFormatFromVisualInfo(display, &vinfo);
81 if (*format == SDL_PIXELFORMAT_UNKNOWN) {
82 SDL_SetError("Unknown window pixel format");
83 return -1;
84 }
85
86 /* Calculate pitch */
87 *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
88
89 /* Create the actual image */
90 #ifndef NO_SHARED_MEMORY
91 if (have_mitshm()) {
92 XShmSegmentInfo *shminfo = &data->shminfo;
93
94 shminfo->shmid = shmget(IPC_PRIVATE, window->h*(*pitch), IPC_CREAT | 0777);
95 if ( shminfo->shmid >= 0 ) {
96 shminfo->shmaddr = (char *)shmat(shminfo->shmid, 0, 0);
97 shminfo->readOnly = False;
98 if ( shminfo->shmaddr != (char *)-1 ) {
99 shm_error = False;
100 X_handler = XSetErrorHandler(shm_errhandler);
101 XShmAttach(display, shminfo);
102 XSync(display, True);
103 XSetErrorHandler(X_handler);
104 if ( shm_error )
105 shmdt(shminfo->shmaddr);
106 } else {
107 shm_error = True;
108 }
109 shmctl(shminfo->shmid, IPC_RMID, NULL);
110 } else {
111 shm_error = True;
112 }
113 if (!shm_error) {
114 data->ximage = XShmCreateImage(display, data->visual,
115 vinfo.depth, ZPixmap,
116 shminfo->shmaddr, shminfo,
117 window->w, window->h);
118 if (!data->ximage) {
119 XShmDetach(display, shminfo);
120 XSync(display, False);
121 shmdt(shminfo->shmaddr);
122 } else {
123 /* Done! */
124 data->use_mitshm = SDL_TRUE;
125 *pixels = shminfo->shmaddr;
126 return 0;
127 }
128 }
129 }
130 #endif /* not NO_SHARED_MEMORY */
131
132 *pixels = SDL_malloc(window->h*(*pitch));
133 if (*pixels == NULL) {
134 SDL_OutOfMemory();
135 return -1;
136 }
137
138 data->ximage = XCreateImage(display, data->visual,
139 vinfo.depth, ZPixmap, 0, (char *)(*pixels),
140 window->w, window->h, 32, 0);
141 if (!data->ximage) {
142 SDL_free(*pixels);
143 SDL_SetError("Couldn't create XImage");
144 return -1;
145 }
146 return 0;
147 }
148
149 int
150 X11_UpdateWindowFramebuffer(_THIS, SDL_Window * window,
151 int numrects, SDL_Rect * rects)
152 {
153 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
154 Display *display = data->videodata->display;
155 int i;
156 SDL_Rect *rect;
157
158 #ifndef NO_SHARED_MEMORY
159 if (data->use_mitshm) {
160 for (i = 0; i < numrects; ++i) {
161 rect = &rects[i];
162
163 if (rect->w == 0 || rect->h == 0) { /* Clipped? */
164 continue;
165 }
166 XShmPutImage(display, data->xwindow, data->gc, data->ximage,
167 rect->x, rect->y,
168 rect->x, rect->y, rect->w, rect->h, False);
169 }
170 }
171 else
172 #endif /* !NO_SHARED_MEMORY */
173 {
174 for (i = 0; i < numrects; ++i) {
175 rect = &rects[i];
176
177 if (rect->w == 0 || rect->h == 0) { /* Clipped? */
178 continue;
179 }
180 XPutImage(display, data->xwindow, data->gc, data->ximage,
181 rect->x, rect->y,
182 rect->x, rect->y, rect->w, rect->h);
183 }
184 }
185 XSync(display, False);
186 }
187
188 void
189 X11_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
190 {
191 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
192 Display *display = data->videodata->display;
193
194 if (data->ximage) {
195 XDestroyImage(data->ximage);
196
197 #ifndef NO_SHARED_MEMORY
198 if (data->use_mitshm) {
199 XShmDetach(display, &data->shminfo);
200 XSync(display, False);
201 shmdt(data->shminfo.shmaddr);
202 data->use_mitshm = SDL_FALSE;
203 }
204 #endif /* !NO_SHARED_MEMORY */
205
206 data->ximage = NULL;
207 }
208 if (data->gc) {
209 XFreeGC(display, data->gc);
210 data->gc = NULL;
211 }
212 }
213
214 /* vi: set ts=4 sw=4 expandtab: */