mirror of
https://github.com/TigerVNC/tigervnc.git
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225 lines
5.6 KiB
C++
225 lines
5.6 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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* Copyright 2011-2014 Pierre Ossman for Cendio AB
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <FL/x.H>
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#include <rfb/LogWriter.h>
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#include <rfb/Exception.h>
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#include "i18n.h"
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#include "X11PixelBuffer.h"
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using namespace rfb;
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static rfb::LogWriter vlog("X11PixelBuffer");
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static PixelFormat display_pf()
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{
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int i;
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int bpp;
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int trueColour, bigEndian;
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int redShift, greenShift, blueShift;
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int redMax, greenMax, blueMax;
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int nformats;
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XPixmapFormatValues* format;
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// Might not be open at this point
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fl_open_display();
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format = XListPixmapFormats(fl_display, &nformats);
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for (i = 0; i < nformats; i++)
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if (format[i].depth == fl_visual->depth) break;
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if (i == nformats)
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// TRANSLATORS: "pixmap" is an X11 concept and may not be suitable
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// to translate.
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throw rfb::Exception(_("Display lacks pixmap format for default depth"));
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switch (format[i].bits_per_pixel) {
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case 8:
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case 16:
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case 32:
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bpp = format[i].bits_per_pixel;
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break;
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default:
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// TRANSLATORS: "pixmap" is an X11 concept and may not be suitable
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// to translate.
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throw rfb::Exception(_("Couldn't find suitable pixmap format"));
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}
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XFree(format);
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bigEndian = (ImageByteOrder(fl_display) == MSBFirst);
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trueColour = (fl_visual->c_class == TrueColor);
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if (!trueColour)
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throw rfb::Exception(_("Only true colour displays supported"));
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vlog.info(_("Using default colormap and visual, TrueColor, depth %d."),
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fl_visual->depth);
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redShift = ffs(fl_visual->red_mask) - 1;
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greenShift = ffs(fl_visual->green_mask) - 1;
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blueShift = ffs(fl_visual->blue_mask) - 1;
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redMax = fl_visual->red_mask >> redShift;
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greenMax = fl_visual->green_mask >> greenShift;
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blueMax = fl_visual->blue_mask >> blueShift;
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return PixelFormat(bpp, fl_visual->depth, bigEndian, trueColour,
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redMax, greenMax, blueMax,
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redShift, greenShift, blueShift);
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}
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X11PixelBuffer::X11PixelBuffer(int width, int height) :
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PlatformPixelBuffer(display_pf(), width, height, NULL, 0),
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shminfo(NULL), xim(NULL)
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{
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// Might not be open at this point
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fl_open_display();
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if (!setupShm()) {
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xim = XCreateImage(fl_display, fl_visual->visual, fl_visual->depth,
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ZPixmap, 0, 0, width, height, BitmapPad(fl_display), 0);
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if (!xim)
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throw rfb::Exception(_("Could not create framebuffer image"));
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xim->data = (char*)malloc(xim->bytes_per_line * xim->height);
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if (!xim->data)
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throw rfb::Exception(_("Not enough memory for framebuffer"));
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}
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data = (rdr::U8*)xim->data;
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stride = xim->bytes_per_line / (getPF().bpp/8);
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}
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X11PixelBuffer::~X11PixelBuffer()
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{
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if (shminfo) {
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vlog.debug("Freeing shared memory XImage");
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shmdt(shminfo->shmaddr);
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shmctl(shminfo->shmid, IPC_RMID, 0);
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delete shminfo;
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shminfo = NULL;
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}
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// XDestroyImage() will free(xim->data) if appropriate
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if (xim)
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XDestroyImage(xim);
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xim = NULL;
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}
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void X11PixelBuffer::draw(int src_x, int src_y, int x, int y, int w, int h)
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{
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if (shminfo)
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XShmPutImage(fl_display, fl_window, fl_gc, xim, src_x, src_y, x, y, w, h, False);
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else
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XPutImage(fl_display, fl_window, fl_gc, xim, src_x, src_y, x, y, w, h);
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}
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static bool caughtError;
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static int XShmAttachErrorHandler(Display *dpy, XErrorEvent *error)
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{
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caughtError = true;
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return 0;
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}
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int X11PixelBuffer::setupShm()
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{
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int major, minor;
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Bool pixmaps;
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XErrorHandler old_handler;
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const char *display_name = XDisplayName (NULL);
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/* Don't use MIT-SHM on remote displays */
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if (*display_name && *display_name != ':')
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return 0;
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if (!XShmQueryVersion(fl_display, &major, &minor, &pixmaps))
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return 0;
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shminfo = new XShmSegmentInfo;
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xim = XShmCreateImage(fl_display, fl_visual->visual, fl_visual->depth,
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ZPixmap, 0, shminfo, width(), height());
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if (!xim)
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goto free_shminfo;
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shminfo->shmid = shmget(IPC_PRIVATE,
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xim->bytes_per_line * xim->height,
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IPC_CREAT|0777);
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if (shminfo->shmid == -1)
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goto free_xim;
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shminfo->shmaddr = xim->data = (char*)shmat(shminfo->shmid, 0, 0);
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if (shminfo->shmaddr == (char *)-1)
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goto free_shm;
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shminfo->readOnly = True;
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// This is the only way we can detect that shared memory won't work
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// (e.g. because we're accessing a remote X11 server)
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caughtError = false;
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old_handler = XSetErrorHandler(XShmAttachErrorHandler);
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if (!XShmAttach(fl_display, shminfo)) {
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XSetErrorHandler(old_handler);
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goto free_shmaddr;
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}
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XSync(fl_display, False);
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XSetErrorHandler(old_handler);
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if (caughtError)
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goto free_shmaddr;
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vlog.debug("Using shared memory XImage");
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return 1;
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free_shmaddr:
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shmdt(shminfo->shmaddr);
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free_shm:
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shmctl(shminfo->shmid, IPC_RMID, 0);
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free_xim:
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XDestroyImage(xim);
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xim = NULL;
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free_shminfo:
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delete shminfo;
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shminfo = NULL;
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return 0;
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}
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