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/* Copyright 2011-2016 Pierre Ossman for Cendio AB
*
* 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.
*/
#include <assert.h>
#if !defined(WIN32) && !defined(__APPLE__)
#include <sys/ipc.h>
#include <sys/shm.h>
#endif
#include <FL/Fl.H>
#include <FL/x.H>
#include <rfb/LogWriter.h>
#include <rdr/Exception.h>
#include "PlatformPixelBuffer.h"
static rfb::LogWriter vlog("PlatformPixelBuffer");
PlatformPixelBuffer::PlatformPixelBuffer(int width, int height) :
FullFramePixelBuffer(rfb::PixelFormat(32, 24, false, true,
255, 255, 255, 16, 8, 0),
width, height, 0, stride),
Surface(width, height)
#if !defined(WIN32) && !defined(__APPLE__)
, shminfo(NULL), xim(NULL)
#endif
{
#if !defined(WIN32) && !defined(__APPLE__)
if (!setupShm()) {
xim = XCreateImage(fl_display, CopyFromParent, 32,
ZPixmap, 0, 0, width, height, 32, 0);
if (!xim)
throw rdr::Exception("XCreateImage");
xim->data = (char*)malloc(xim->bytes_per_line * xim->height);
if (!xim->data)
throw rdr::Exception("malloc");
vlog.debug("Using standard XImage");
}
data = (rdr::U8*)xim->data;
stride = xim->bytes_per_line / (getPF().bpp/8);
#else
FullFramePixelBuffer::data = (rdr::U8*)Surface::data;
stride = width;
#endif
}
PlatformPixelBuffer::~PlatformPixelBuffer()
{
#if !defined(WIN32) && !defined(__APPLE__)
if (shminfo) {
vlog.debug("Freeing shared memory XImage");
XShmDetach(fl_display, shminfo);
shmdt(shminfo->shmaddr);
shmctl(shminfo->shmid, IPC_RMID, 0);
delete shminfo;
shminfo = NULL;
}
// XDestroyImage() will free(xim->data) if appropriate
if (xim)
XDestroyImage(xim);
xim = NULL;
#endif
}
void PlatformPixelBuffer::commitBufferRW(const rfb::Rect& r)
{
FullFramePixelBuffer::commitBufferRW(r);
mutex.lock();
damage.assign_union(rfb::Region(r));
mutex.unlock();
}
rfb::Rect PlatformPixelBuffer::getDamage(void)
{
rfb::Rect r;
mutex.lock();
r = damage.get_bounding_rect();
damage.clear();
mutex.unlock();
#if !defined(WIN32) && !defined(__APPLE__)
GC gc;
gc = XCreateGC(fl_display, pixmap, 0, NULL);
if (shminfo) {
XShmPutImage(fl_display, pixmap, gc, xim,
r.tl.x, r.tl.y, r.tl.x, r.tl.y,
r.width(), r.height(), False);
// Need to make sure the X server has finished reading the
// shared memory before we return
XSync(fl_display, False);
} else {
XPutImage(fl_display, pixmap, gc, xim,
r.tl.x, r.tl.y, r.tl.x, r.tl.y, r.width(), r.height());
}
XFreeGC(fl_display, gc);
#endif
return r;
}
#if !defined(WIN32) && !defined(__APPLE__)
static bool caughtError;
static int XShmAttachErrorHandler(Display *dpy, XErrorEvent *error)
{
caughtError = true;
return 0;
}
bool PlatformPixelBuffer::setupShm()
{
int major, minor;
Bool pixmaps;
XErrorHandler old_handler;
const char *display_name = XDisplayName (NULL);
/* Don't use MIT-SHM on remote displays */
if (*display_name && *display_name != ':')
return false;
if (!XShmQueryVersion(fl_display, &major, &minor, &pixmaps))
return false;
shminfo = new XShmSegmentInfo;
xim = XShmCreateImage(fl_display, CopyFromParent, 32,
ZPixmap, 0, shminfo, width(), height());
if (!xim)
goto free_shminfo;
shminfo->shmid = shmget(IPC_PRIVATE,
xim->bytes_per_line * xim->height,
IPC_CREAT|0600);
if (shminfo->shmid == -1)
goto free_xim;
shminfo->shmaddr = xim->data = (char*)shmat(shminfo->shmid, 0, 0);
shmctl(shminfo->shmid, IPC_RMID, 0); // to avoid memory leakage
if (shminfo->shmaddr == (char *)-1)
goto free_xim;
shminfo->readOnly = True;
// This is the only way we can detect that shared memory won't work
// (e.g. because we're accessing a remote X11 server)
caughtError = false;
old_handler = XSetErrorHandler(XShmAttachErrorHandler);
if (!XShmAttach(fl_display, shminfo)) {
XSetErrorHandler(old_handler);
goto free_shmaddr;
}
XSync(fl_display, False);
XSetErrorHandler(old_handler);
if (caughtError)
goto free_shmaddr;
vlog.debug("Using shared memory XImage");
return true;
free_shmaddr:
shmdt(shminfo->shmaddr);
free_xim:
XDestroyImage(xim);
xim = NULL;
free_shminfo:
delete shminfo;
shminfo = NULL;
return 0;
}
#endif
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