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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright 2011 Pierre Ossman <ossman@cendio.se> 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdlib.h>
#include <FL/x.H>
#include <rfb/LogWriter.h>
#include <rfb/Exception.h>
#include "X11PixelBuffer.h"
using namespace rfb;
static rfb::LogWriter vlog("PlatformPixelBuffer");
static PixelFormat display_pf()
{
int i;
int bpp;
int trueColour, bigEndian;
int redShift, greenShift, blueShift;
int redMax, greenMax, blueMax;
int nformats;
XPixmapFormatValues* format;
// Might not be open at this point
fl_open_display();
format = XListPixmapFormats(fl_display, &nformats);
for (i = 0; i < nformats; i++)
if (format[i].depth == fl_visual->depth) break;
if (i == nformats)
throw rfb::Exception("Error: display lacks pixmap format for default depth");
switch (format[i].bits_per_pixel) {
case 8:
case 16:
case 32:
bpp = format[i].bits_per_pixel;
break;
default:
throw rfb::Exception("Error: couldn't find suitable pixmap format");
}
XFree(format);
bigEndian = (ImageByteOrder(fl_display) == MSBFirst);
trueColour = (fl_visual->c_class == TrueColor);
if (!trueColour)
throw rfb::Exception("Error: only true colour displays supported");
vlog.info("Using default colormap and visual, %sdepth %d.",
(fl_visual->c_class == TrueColor) ? "TrueColor, " :
((fl_visual->c_class == PseudoColor) ? "PseudoColor, " : ""),
fl_visual->depth);
redShift = ffs(fl_visual->red_mask) - 1;
greenShift = ffs(fl_visual->green_mask) - 1;
blueShift = ffs(fl_visual->blue_mask) - 1;
redMax = fl_visual->red_mask >> redShift;
greenMax = fl_visual->green_mask >> greenShift;
blueMax = fl_visual->blue_mask >> blueShift;
return PixelFormat(bpp, fl_visual->depth, bigEndian, trueColour,
redMax, greenMax, blueMax,
redShift, greenShift, blueShift);
}
PlatformPixelBuffer::PlatformPixelBuffer(int width, int height) :
FullFramePixelBuffer(display_pf(), width, height, NULL, NULL),
shminfo(NULL), xim(NULL)
{
// Might not be open at this point
fl_open_display();
if (!setupShm()) {
xim = XCreateImage(fl_display, fl_visual->visual, fl_visual->depth,
ZPixmap, 0, 0, width, height, BitmapPad(fl_display), 0);
assert(xim);
xim->data = (char*)malloc(xim->bytes_per_line * xim->height);
assert(xim->data);
}
data = (rdr::U8*)xim->data;
}
PlatformPixelBuffer::~PlatformPixelBuffer()
{
if (shminfo) {
vlog.debug("Freeing shared memory XImage");
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;
}
void PlatformPixelBuffer::draw(int src_x, int src_y, int x, int y, int w, int h)
{
if (shminfo)
XShmPutImage(fl_display, fl_window, fl_gc, xim, src_x, src_y, x, y, w, h, False);
else
XPutImage(fl_display, fl_window, fl_gc, xim, src_x, src_y, x, y, w, h);
}
int PlatformPixelBuffer::getStride() const
{
return xim->bytes_per_line / (getPF().bpp/8);
}
static bool caughtError;
static int XShmAttachErrorHandler(Display *dpy, XErrorEvent *error)
{
caughtError = true;
return 0;
}
int PlatformPixelBuffer::setupShm()
{
int major, minor;
Bool pixmaps;
XErrorHandler old_handler;
Status status;
if (!XShmQueryVersion(fl_display, &major, &minor, &pixmaps))
return 0;
shminfo = new XShmSegmentInfo;
xim = XShmCreateImage(fl_display, fl_visual->visual, fl_visual->depth,
ZPixmap, 0, shminfo, width(), height());
if (!xim)
goto free_shminfo;
shminfo->shmid = shmget(IPC_PRIVATE,
xim->bytes_per_line * xim->height,
IPC_CREAT|0777);
if (shminfo->shmid == -1)
goto free_xim;
shminfo->shmaddr = xim->data = (char*)shmat(shminfo->shmid, 0, 0);
if (shminfo->shmaddr == (char *)-1)
goto free_shm;
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);
XShmAttach(fl_display, shminfo);
XSync(fl_display, False);
XSetErrorHandler(old_handler);
if (caughtError)
goto free_shmaddr;
vlog.debug("Using shared memory XImage");
return 1;
free_shmaddr:
shmdt(shminfo->shmaddr);
free_shm:
shmctl(shminfo->shmid, IPC_RMID, 0);
free_xim:
XDestroyImage(xim);
xim = NULL;
free_shminfo:
delete shminfo;
shminfo = NULL;
return 0;
}
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