2 Simple DirectMedia Layer
3 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
21 #include "../../SDL_internal.h"
23 #if SDL_VIDEO_DRIVER_X11
25 #include "SDL_x11video.h"
26 #include "SDL_x11framebuffer.h"
29 #ifndef NO_SHARED_MEMORY
31 /* Shared memory error handler routine */
33 static int (*X_handler)(Display *, XErrorEvent *) = NULL;
34 static int shm_errhandler(Display *d, XErrorEvent *e)
36 if ( e->error_code == BadAccess ) {
40 return(X_handler(d,e));
43 static SDL_bool have_mitshm(void)
45 /* Only use shared memory on local X servers */
46 if ( (SDL_strncmp(X11_XDisplayName(NULL), ":", 1) == 0) ||
47 (SDL_strncmp(X11_XDisplayName(NULL), "unix:", 5) == 0) ) {
48 return SDL_X11_HAVE_SHM;
53 #endif /* !NO_SHARED_MEMORY */
56 X11_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format,
57 void ** pixels, int *pitch)
59 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
60 Display *display = data->videodata->display;
64 /* Free the old framebuffer surface */
65 X11_DestroyWindowFramebuffer(_this, window);
67 /* Create the graphics context for drawing */
68 gcv.graphics_exposures = False;
69 data->gc = X11_XCreateGC(display, data->xwindow, GCGraphicsExposures, &gcv);
71 return SDL_SetError("Couldn't create graphics context");
74 /* Find out the pixel format and depth */
75 if (X11_GetVisualInfoFromVisual(display, data->visual, &vinfo) < 0) {
76 return SDL_SetError("Couldn't get window visual information");
79 *format = X11_GetPixelFormatFromVisualInfo(display, &vinfo);
80 if (*format == SDL_PIXELFORMAT_UNKNOWN) {
81 return SDL_SetError("Unknown window pixel format");
85 *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
87 /* Create the actual image */
88 #ifndef NO_SHARED_MEMORY
90 XShmSegmentInfo *shminfo = &data->shminfo;
92 shminfo->shmid = shmget(IPC_PRIVATE, window->h*(*pitch), IPC_CREAT | 0777);
93 if ( shminfo->shmid >= 0 ) {
94 shminfo->shmaddr = (char *)shmat(shminfo->shmid, 0, 0);
95 shminfo->readOnly = False;
96 if ( shminfo->shmaddr != (char *)-1 ) {
98 X_handler = X11_XSetErrorHandler(shm_errhandler);
99 X11_XShmAttach(display, shminfo);
100 X11_XSync(display, True);
101 X11_XSetErrorHandler(X_handler);
103 shmdt(shminfo->shmaddr);
107 shmctl(shminfo->shmid, IPC_RMID, NULL);
112 data->ximage = X11_XShmCreateImage(display, data->visual,
113 vinfo.depth, ZPixmap,
114 shminfo->shmaddr, shminfo,
115 window->w, window->h);
117 X11_XShmDetach(display, shminfo);
118 X11_XSync(display, False);
119 shmdt(shminfo->shmaddr);
122 data->use_mitshm = SDL_TRUE;
123 *pixels = shminfo->shmaddr;
128 #endif /* not NO_SHARED_MEMORY */
130 *pixels = SDL_malloc(window->h*(*pitch));
131 if (*pixels == NULL) {
132 return SDL_OutOfMemory();
135 data->ximage = X11_XCreateImage(display, data->visual,
136 vinfo.depth, ZPixmap, 0, (char *)(*pixels),
137 window->w, window->h, 32, 0);
140 return SDL_SetError("Couldn't create XImage");
146 X11_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rect * rects,
149 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
150 Display *display = data->videodata->display;
153 #ifndef NO_SHARED_MEMORY
154 if (data->use_mitshm) {
155 for (i = 0; i < numrects; ++i) {
161 if (w <= 0 || h <= 0 || (x + w) <= 0 || (y + h) <= 0) {
175 if (x + w > window->w)
177 if (y + h > window->h)
180 X11_XShmPutImage(display, data->xwindow, data->gc, data->ximage,
181 x, y, x, y, w, h, False);
185 #endif /* !NO_SHARED_MEMORY */
187 for (i = 0; i < numrects; ++i) {
193 if (w <= 0 || h <= 0 || (x + w) <= 0 || (y + h) <= 0) {
207 if (x + w > window->w)
209 if (y + h > window->h)
212 X11_XPutImage(display, data->xwindow, data->gc, data->ximage,
217 X11_XSync(display, False);
223 X11_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
225 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
229 /* The window wasn't fully initialized */
233 display = data->videodata->display;
236 XDestroyImage(data->ximage);
238 #ifndef NO_SHARED_MEMORY
239 if (data->use_mitshm) {
240 X11_XShmDetach(display, &data->shminfo);
241 X11_XSync(display, False);
242 shmdt(data->shminfo.shmaddr);
243 data->use_mitshm = SDL_FALSE;
245 #endif /* !NO_SHARED_MEMORY */
250 X11_XFreeGC(display, data->gc);
255 #endif /* SDL_VIDEO_DRIVER_X11 */
257 /* vi: set ts=4 sw=4 expandtab: */