mirror of
https://github.com/TigerVNC/tigervnc.git
synced 2024-08-21 17:54:34 +02:00
![Constantin Kaplinsky](/assets/img/avatar_default.png)
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2 3789f03b-4d11-0410-bbf8-ca57d06f2519
150 lines
3.8 KiB
C++
150 lines
3.8 KiB
C++
/* Copyright (C) 2002-2003 RealVNC Ltd. All Rights Reserved.
|
|
*
|
|
* This is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This software is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this software; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
* USA.
|
|
*/
|
|
//
|
|
// Image.cxx
|
|
//
|
|
|
|
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <sys/ipc.h>
|
|
#include <sys/shm.h>
|
|
#include <X11/Xlib.h>
|
|
#include <X11/Xutil.h>
|
|
#include <X11/extensions/XShm.h>
|
|
#include "Image.h"
|
|
#include <list>
|
|
|
|
class ImageCleanup {
|
|
public:
|
|
std::list<Image*> images;
|
|
|
|
~ImageCleanup()
|
|
{
|
|
fprintf(stderr,"~ImageCleanup called\n");
|
|
|
|
while (!images.empty()) {
|
|
delete images.front();
|
|
}
|
|
}
|
|
};
|
|
|
|
ImageCleanup imageCleanup;
|
|
|
|
static bool caughtShmError = false;
|
|
|
|
static int ShmCreationXErrorHandler(Display *dpy, XErrorEvent *error)
|
|
{
|
|
caughtShmError = true;
|
|
return 0;
|
|
}
|
|
|
|
Image::Image(Display* d, int width, int height)
|
|
: xim(0), dpy(d), shminfo(0), usingShm(false)
|
|
{
|
|
if (createShmImage(width, height)) return;
|
|
|
|
xim = XCreateImage(dpy, DefaultVisual(dpy, DefaultScreen(dpy)),
|
|
DefaultDepth(dpy,DefaultScreen(dpy)), ZPixmap,
|
|
0, 0, width, height, BitmapPad(dpy), 0);
|
|
|
|
xim->data = (char*)malloc(xim->bytes_per_line * xim->height);
|
|
if (!xim->data) {
|
|
fprintf(stderr,"malloc failed\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
Image::~Image()
|
|
{
|
|
fprintf(stderr,"~Image called - usingShm %d\n",usingShm);
|
|
if (usingShm) {
|
|
usingShm = false;
|
|
shmdt(shminfo->shmaddr);
|
|
shmctl(shminfo->shmid, IPC_RMID, 0);
|
|
imageCleanup.images.remove(this);
|
|
}
|
|
delete shminfo;
|
|
if (xim) XDestroyImage(xim);
|
|
}
|
|
|
|
void Image::get(Window w)
|
|
{
|
|
if (usingShm) {
|
|
XShmGetImage(dpy, w, xim, 0, 0, AllPlanes);
|
|
} else {
|
|
XGetSubImage(dpy, w, 0, 0, xim->width, xim->height,
|
|
AllPlanes, ZPixmap, xim, 0, 0);
|
|
}
|
|
}
|
|
|
|
bool Image::createShmImage(int width, int height)
|
|
{
|
|
if (XShmQueryExtension(dpy)) {
|
|
shminfo = new XShmSegmentInfo;
|
|
|
|
xim = XShmCreateImage(dpy, DefaultVisual(dpy, DefaultScreen(dpy)),
|
|
DefaultDepth(dpy,DefaultScreen(dpy)), ZPixmap,
|
|
0, shminfo, width, height);
|
|
|
|
if (xim) {
|
|
shminfo->shmid = shmget(IPC_PRIVATE,
|
|
xim->bytes_per_line * xim->height,
|
|
IPC_CREAT|0777);
|
|
|
|
if (shminfo->shmid != -1) {
|
|
shminfo->shmaddr = xim->data = (char*)shmat(shminfo->shmid, 0, 0);
|
|
|
|
if (shminfo->shmaddr != (char *)-1) {
|
|
|
|
shminfo->readOnly = False;
|
|
|
|
XErrorHandler oldHdlr = XSetErrorHandler(ShmCreationXErrorHandler);
|
|
XShmAttach(dpy, shminfo);
|
|
XSync(dpy, False);
|
|
XSetErrorHandler(oldHdlr);
|
|
|
|
if (!caughtShmError) {
|
|
fprintf(stderr,"Using shared memory XImage\n");
|
|
usingShm = true;
|
|
imageCleanup.images.push_back(this);
|
|
return true;
|
|
}
|
|
|
|
shmdt(shminfo->shmaddr);
|
|
} else {
|
|
fprintf(stderr,"shmat failed\n");
|
|
perror("shmat");
|
|
}
|
|
|
|
shmctl(shminfo->shmid, IPC_RMID, 0);
|
|
} else {
|
|
fprintf(stderr,"shmget failed\n");
|
|
perror("shmget");
|
|
}
|
|
|
|
XDestroyImage(xim);
|
|
xim = 0;
|
|
} else {
|
|
fprintf(stderr,"XShmCreateImage failed\n");
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|