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- /* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
- * Copyright 2011-2014 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.
- */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #include <stdlib.h>
-
- #include <FL/x.H>
-
- #include <rfb/LogWriter.h>
- #include <rfb/Exception.h>
-
- #include "i18n.h"
- #include "X11PixelBuffer.h"
-
- using namespace rfb;
-
- static rfb::LogWriter vlog("X11PixelBuffer");
-
- 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)
- // TRANSLATORS: "pixmap" is an X11 concept and may not be suitable
- // to translate.
- throw rfb::Exception(_("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:
- // TRANSLATORS: "pixmap" is an X11 concept and may not be suitable
- // to translate.
- throw rfb::Exception(_("Couldn't find suitable pixmap format"));
- }
-
- XFree(format);
-
- bigEndian = (ImageByteOrder(fl_display) == MSBFirst);
- trueColour = (fl_visual->c_class == TrueColor);
-
- if (!trueColour)
- throw rfb::Exception(_("Only true colour displays supported"));
-
- vlog.info(_("Using default colormap and visual, TrueColor, depth %d."),
- 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);
- }
-
- X11PixelBuffer::X11PixelBuffer(int width, int height) :
- PlatformPixelBuffer(display_pf(), width, height, NULL, 0),
- 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);
- if (!xim)
- throw rfb::Exception(_("Could not create framebuffer image"));
-
- xim->data = (char*)malloc(xim->bytes_per_line * xim->height);
- if (!xim->data)
- throw rfb::Exception(_("Not enough memory for framebuffer"));
- }
-
- data = (rdr::U8*)xim->data;
- stride = xim->bytes_per_line / (getPF().bpp/8);
- }
-
-
- X11PixelBuffer::~X11PixelBuffer()
- {
- 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 X11PixelBuffer::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);
- }
-
-
- static bool caughtError;
-
- static int XShmAttachErrorHandler(Display *dpy, XErrorEvent *error)
- {
- caughtError = true;
- return 0;
- }
-
- int X11PixelBuffer::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 0;
-
- 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);
-
- 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 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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