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SDL_x11framebuffer.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
4 
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.
8 
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:
12 
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.
20 */
21 #include "SDL_config.h"
22 
23 #if SDL_VIDEO_DRIVER_X11
24 
25 #include "SDL_x11video.h"
26 #include "SDL_x11framebuffer.h"
27 
28 
29 #ifndef NO_SHARED_MEMORY
30 
31 /* Shared memory error handler routine */
32 static int shm_error;
33 static int (*X_handler)(Display *, XErrorEvent *) = NULL;
34 static int shm_errhandler(Display *d, XErrorEvent *e)
35 {
36  if ( e->error_code == BadAccess ) {
37  shm_error = True;
38  return(0);
39  } else
40  return(X_handler(d,e));
41 }
42 
43 static SDL_bool have_mitshm(void)
44 {
45  /* Only use shared memory on local X servers */
46  if ( (SDL_strncmp(XDisplayName(NULL), ":", 1) == 0) ||
47  (SDL_strncmp(XDisplayName(NULL), "unix:", 5) == 0) ) {
48  return SDL_X11_HAVE_SHM;
49  }
50  return SDL_FALSE;
51 }
52 
53 #endif /* !NO_SHARED_MEMORY */
54 
55 int
56 X11_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format,
57  void ** pixels, int *pitch)
58 {
59  SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
60  Display *display = data->videodata->display;
61  XGCValues gcv;
62  XVisualInfo vinfo;
63 
64  /* Free the old framebuffer surface */
65  X11_DestroyWindowFramebuffer(_this, window);
66 
67  /* Create the graphics context for drawing */
68  gcv.graphics_exposures = False;
69  data->gc = XCreateGC(display, data->xwindow, GCGraphicsExposures, &gcv);
70  if (!data->gc) {
71  return SDL_SetError("Couldn't create graphics context");
72  }
73 
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");
77  }
78 
79  *format = X11_GetPixelFormatFromVisualInfo(display, &vinfo);
80  if (*format == SDL_PIXELFORMAT_UNKNOWN) {
81  return SDL_SetError("Unknown window pixel format");
82  }
83 
84  /* Calculate pitch */
85  *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
86 
87  /* Create the actual image */
88 #ifndef NO_SHARED_MEMORY
89  if (have_mitshm()) {
90  XShmSegmentInfo *shminfo = &data->shminfo;
91 
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 ) {
97  shm_error = False;
98  X_handler = XSetErrorHandler(shm_errhandler);
99  XShmAttach(display, shminfo);
100  XSync(display, True);
101  XSetErrorHandler(X_handler);
102  if ( shm_error )
103  shmdt(shminfo->shmaddr);
104  } else {
105  shm_error = True;
106  }
107  shmctl(shminfo->shmid, IPC_RMID, NULL);
108  } else {
109  shm_error = True;
110  }
111  if (!shm_error) {
112  data->ximage = XShmCreateImage(display, data->visual,
113  vinfo.depth, ZPixmap,
114  shminfo->shmaddr, shminfo,
115  window->w, window->h);
116  if (!data->ximage) {
117  XShmDetach(display, shminfo);
118  XSync(display, False);
119  shmdt(shminfo->shmaddr);
120  } else {
121  /* Done! */
122  data->use_mitshm = SDL_TRUE;
123  *pixels = shminfo->shmaddr;
124  return 0;
125  }
126  }
127  }
128 #endif /* not NO_SHARED_MEMORY */
129 
130  *pixels = SDL_malloc(window->h*(*pitch));
131  if (*pixels == NULL) {
132  return SDL_OutOfMemory();
133  }
134 
135  data->ximage = XCreateImage(display, data->visual,
136  vinfo.depth, ZPixmap, 0, (char *)(*pixels),
137  window->w, window->h, 32, 0);
138  if (!data->ximage) {
139  SDL_free(*pixels);
140  return SDL_SetError("Couldn't create XImage");
141  }
142  return 0;
143 }
144 
145 int
146 X11_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rect * rects,
147  int numrects)
148 {
149  SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
150  Display *display = data->videodata->display;
151  int i;
152  int x, y, w ,h;
153 #ifndef NO_SHARED_MEMORY
154  if (data->use_mitshm) {
155  for (i = 0; i < numrects; ++i) {
156  x = rects[i].x;
157  y = rects[i].y;
158  w = rects[i].w;
159  h = rects[i].h;
160 
161  if (w <= 0 || h <= 0 || (x + w) <= 0 || (y + h) <= 0) {
162  /* Clipped? */
163  continue;
164  }
165  if (x < 0)
166  {
167  x += w;
168  w += rects[i].x;
169  }
170  if (y < 0)
171  {
172  y += h;
173  h += rects[i].y;
174  }
175  if (x + w > window->w)
176  w = window->w - x;
177  if (y + h > window->h)
178  h = window->h - y;
179 
180  XShmPutImage(display, data->xwindow, data->gc, data->ximage,
181  x, y, x, y, w, h, False);
182  }
183  }
184  else
185 #endif /* !NO_SHARED_MEMORY */
186  {
187  for (i = 0; i < numrects; ++i) {
188  x = rects[i].x;
189  y = rects[i].y;
190  w = rects[i].w;
191  h = rects[i].h;
192 
193  if (w <= 0 || h <= 0 || (x + w) <= 0 || (y + h) <= 0) {
194  /* Clipped? */
195  continue;
196  }
197  if (x < 0)
198  {
199  x += w;
200  w += rects[i].x;
201  }
202  if (y < 0)
203  {
204  y += h;
205  h += rects[i].y;
206  }
207  if (x + w > window->w)
208  w = window->w - x;
209  if (y + h > window->h)
210  h = window->h - y;
211 
212  XPutImage(display, data->xwindow, data->gc, data->ximage,
213  x, y, x, y, w, h);
214  }
215  }
216 
217  XSync(display, False);
218 
219  return 0;
220 }
221 
222 void
223 X11_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
224 {
225  SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
226  Display *display;
227 
228  if (!data) {
229  /* The window wasn't fully initialized */
230  return;
231  }
232 
233  display = data->videodata->display;
234 
235  if (data->ximage) {
236  XDestroyImage(data->ximage);
237 
238 #ifndef NO_SHARED_MEMORY
239  if (data->use_mitshm) {
240  XShmDetach(display, &data->shminfo);
241  XSync(display, False);
242  shmdt(data->shminfo.shmaddr);
243  data->use_mitshm = SDL_FALSE;
244  }
245 #endif /* !NO_SHARED_MEMORY */
246 
247  data->ximage = NULL;
248  }
249  if (data->gc) {
250  XFreeGC(display, data->gc);
251  data->gc = NULL;
252  }
253 }
254 
255 #endif /* SDL_VIDEO_DRIVER_X11 */
256 
257 /* vi: set ts=4 sw=4 expandtab: */
X11_GetPixelFormatFromVisualInfo
Uint32 X11_GetPixelFormatFromVisualInfo(Display *display, XVisualInfo *vinfo)
SDL_VideoData::display
Display * display
Definition: SDL_x11video.h:75
SDL_WindowData::shminfo
XShmSegmentInfo shminfo
Definition: SDL_x11window.h:54
SDL_WindowData::use_mitshm
SDL_bool use_mitshm
Definition: SDL_x11window.h:53
X11_CreateWindowFramebuffer
int X11_CreateWindowFramebuffer(_THIS, SDL_Window *window, Uint32 *format, void **pixels, int *pitch)
SDL_WindowData::visual
Visual * visual
Definition: SDL_x11window.h:49
h
GLfloat GLfloat GLfloat GLfloat h
Definition: glew.h:7294
SDL_Window::w
int w
Definition: SDL_sysvideo.h:78
NULL
#define NULL
Definition: ftobjs.h:61
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:116
SDL_WindowData::xwindow
Window xwindow
Definition: SDL_x11window.h:47
SDL_TRUE
Definition: SDL_stdinc.h:119
x
EGLSurface EGLint x
Definition: eglext.h:293
e
return Display return Display Bool Bool int int e
Definition: SDL_x11sym.h:30
SDL_free
DECLSPEC void SDLCALL SDL_free(void *mem)
SDL_WindowData::ximage
XImage * ximage
Definition: SDL_x11window.h:56
SDL_PIXELFORMAT_UNKNOWN
Definition: SDL_pixels.h:149
X11_UpdateWindowFramebuffer
int X11_UpdateWindowFramebuffer(_THIS, SDL_Window *window, const SDL_Rect *rects, int numrects)
SDL_BYTESPERPIXEL
#define SDL_BYTESPERPIXEL(X)
Definition: SDL_pixels.h:123
d
return Display return Display Bool Bool int d
Definition: SDL_x11sym.h:30
display
char * display
Definition: visualinfo.c:85
if
if(!yyg->yy_init)
Definition: glslang_lex.cpp:1037
SDL_FALSE
Definition: SDL_stdinc.h:118
SDL_WindowData::gc
GC gc
Definition: SDL_x11window.h:57
X11_DestroyWindowFramebuffer
void X11_DestroyWindowFramebuffer(_THIS, SDL_Window *window)
SDL_config.h
SDL_WindowData
Definition: SDL_androidwindow.h:33
_this
static SDL_VideoDevice * _this
Definition: SDL_video.c:92
Uint32
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:145
int
int
Definition: SDL_systhread.c:37
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: gl2ext.h:848
_THIS
#define _THIS
Definition: SDL_alsa_audio.h:31
SDL_WindowData::videodata
struct SDL_VideoData * videodata
Definition: SDL_cocoawindow.h:90
XShmAttach
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int int int return Display Window Cursor return Display Window return Display Drawable GC int int unsigned int unsigned int return Display Drawable GC int int _Xconst char int return Display Drawable GC int int unsigned int unsigned int return Display return Display Cursor return Display GC return XModifierKeymap return char Display Window int return Display return Display Atom return Display Window XWindowAttributes return Display Window return Display XEvent Bool(*) XPointer return Display Window Bool unsigned int int int Window Cursor Time return Display Window int return KeySym return Display _Xconst char Bool return Display _Xconst char return XKeyEvent char int KeySym XComposeStatus return Display int int int XVisualInfo return Display Window int int return _Xconst char return Display XEvent return Display Drawable GC XImage int int int int unsigned int unsigned int return Display Window Window Window int int int int unsigned int return Display Window Window int int return Display Window unsigned int unsigned int return Display Window Bool long XEvent return Display GC unsigned long return Display Window int Time return Display Window Window return Display Window unsigned long return Display Window XSizeHints Display Colormap XColor int return char int XTextProperty return XFontStruct _Xconst char int int int int XCharStruct return Display Window return Display Time return Display Colormap return Display Window Window int int unsigned int unsigned int int int return Display Window int return XExtensionInfo Display char XExtensionHooks int XPointer return XExtensionInfo XExtensionInfo Display return Display return Display unsigned long Display GC Display char long Display xReply int Bool return Display Bool return Display int SDL_X11_XESetEventToWireRetType retur XShmAttach)
Definition: SDL_x11sym.h:192
format
GLint GLenum GLsizei GLsizei GLsizei GLint GLenum format
Definition: gl2ext.h:845
SDL_SetError
DECLSPEC int SDLCALL SDL_SetError(const char *fmt,...)
Definition: SDL_error.c:53
SDL_malloc
DECLSPEC void *SDLCALL SDL_malloc(size_t size)
SDL_Rect::x
int x
Definition: SDL_rect.h:65
SDL_Rect::w
int w
Definition: SDL_rect.h:66
SDL_strncmp
DECLSPEC int SDLCALL SDL_strncmp(const char *str1, const char *str2, size_t maxlen)
Definition: SDL_string.c:926
SDL_x11framebuffer.h
SDL_Window::h
int h
Definition: SDL_sysvideo.h:78
y
EGLSurface EGLint EGLint y
Definition: eglext.h:293
SDL_OutOfMemory
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
pixels
GLint GLenum GLsizei GLsizei GLsizei GLint GLenum GLenum const GLvoid * pixels
Definition: gl2ext.h:845
XPutImage
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int int int return Display Window Cursor return Display Window return Display Drawable GC int int unsigned int unsigned int return Display Drawable GC int int _Xconst char int return Display Drawable GC int int unsigned int unsigned int return Display return Display Cursor return Display GC return XModifierKeymap return char Display Window int return Display return Display Atom return Display Window XWindowAttributes return Display Window return Display XEvent Bool(*) XPointer return Display Window Bool unsigned int int int Window Cursor Time return Display Window int return KeySym return Display _Xconst char Bool return Display _Xconst char return XKeyEvent char int KeySym XComposeStatus return Display int int int XVisualInfo return Display Window int int return _Xconst char return Display XEvent retur XPutImage)
Definition: SDL_x11sym.h:96
SDL_Rect::h
int h
Definition: SDL_rect.h:66
SDL_Window
Definition: SDL_sysvideo.h:71
XCreateImage
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char retur XCreateImage)
Definition: SDL_x11sym.h:42
SDL_x11video.h
w
GLint GLint GLint GLint GLint w
Definition: gl2ext.h:1215
XShmPutImage
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int int int return Display Window Cursor return Display Window return Display Drawable GC int int unsigned int unsigned int return Display Drawable GC int int _Xconst char int return Display Drawable GC int int unsigned int unsigned int return Display return Display Cursor return Display GC return XModifierKeymap return char Display Window int return Display return Display Atom return Display Window XWindowAttributes return Display Window return Display XEvent Bool(*) XPointer return Display Window Bool unsigned int int int Window Cursor Time return Display Window int return KeySym return Display _Xconst char Bool return Display _Xconst char return XKeyEvent char int KeySym XComposeStatus return Display int int int XVisualInfo return Display Window int int return _Xconst char return Display XEvent return Display Drawable GC XImage int int int int unsigned int unsigned int return Display Window Window Window int int int int unsigned int return Display Window Window int int return Display Window unsigned int unsigned int return Display Window Bool long XEvent return Display GC unsigned long return Display Window int Time return Display Window Window return Display Window unsigned long return Display Window XSizeHints Display Colormap XColor int return char int XTextProperty return XFontStruct _Xconst char int int int int XCharStruct return Display Window return Display Time return Display Colormap return Display Window Window int int unsigned int unsigned int int int return Display Window int return XExtensionInfo Display char XExtensionHooks int XPointer return XExtensionInfo XExtensionInfo Display return Display return Display unsigned long Display GC Display char long Display xReply int Bool return Display Bool return Display int SDL_X11_XESetEventToWireRetType return Display XShmSegmentInfo retur XShmPutImage)
Definition: SDL_x11sym.h:194
SDL_Window::driverdata
void * driverdata
Definition: SDL_sysvideo.h:99
i
int i
Definition: pngrutil.c:1377
X11_GetVisualInfoFromVisual
int X11_GetVisualInfoFromVisual(Display *display, Visual *visual, XVisualInfo *vinfo)
SDL_Rect::y
int y
Definition: SDL_rect.h:65
XFreeGC
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int int int return Display Window Cursor return Display Window return Display Drawable GC int int unsigned int unsigned int return Display Drawable GC int int _Xconst char int return Display Drawable GC int int unsigned int unsigned int return Display return Display Cursor retur XFreeGC)
Definition: SDL_x11sym.h:58
SDL_Rect
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:63