mirror of
https://github.com/gnif/LookingGlass.git
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3912d3411c
Due to the logic in the event loop property events may get filtered out that were clipboard related. This changes ensures the clipboard event handler code gets to run first avoiding this issue.
423 lines
9.7 KiB
C
423 lines
9.7 KiB
C
/*
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Looking Glass - KVM FrameRelay (KVMFR) Client
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Copyright (C) 2017-2021 Geoffrey McRae <geoff@hostfission.com>
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https://looking-glass.hostfission.com
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "clipboard.h"
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#include "x11.h"
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#include "atoms.h"
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#include <string.h>
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#include <unistd.h>
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#include <X11/Xlib.h>
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#include <X11/Xatom.h>
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#include "app.h"
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#include "common/debug.h"
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struct X11ClipboardState
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{
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Atom aCurSelection;
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Atom aTypes[LG_CLIPBOARD_DATA_NONE];
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LG_ClipboardData type;
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bool haveRequest;
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bool incrStart;
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unsigned int lowerBound;
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};
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static const char * atomTypes[] =
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{
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"UTF8_STRING",
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"image/png",
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"image/bmp",
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"image/tiff",
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"image/jpeg"
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};
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static struct X11ClipboardState x11cb;
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// forwards
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static void x11CBSelectionRequest(const XSelectionRequestEvent e);
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static void x11CBSelectionClear(const XSelectionClearEvent e);
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static void x11CBSelectionIncr(const XPropertyEvent e);
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static void x11CBSelectionNotify(const XSelectionEvent e);
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static void x11CBXFixesSelectionNotify(const XFixesSelectionNotifyEvent e);
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bool x11CBEventThread(const XEvent xe)
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{
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switch(xe.type)
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{
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case SelectionRequest:
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x11CBSelectionRequest(xe.xselectionrequest);
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return true;
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case SelectionClear:
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x11CBSelectionClear(xe.xselectionclear);
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return true;
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case SelectionNotify:
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x11CBSelectionNotify(xe.xselection);
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return true;
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case PropertyNotify:
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if (xe.xproperty.atom == x11atoms.SEL_DATA)
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{
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if (x11cb.lowerBound == 0)
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return true;
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x11CBSelectionIncr(xe.xproperty);
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return true;
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}
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break;
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default:
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if (xe.type == x11.eventBase + XFixesSelectionNotify)
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{
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XFixesSelectionNotifyEvent * sne = (XFixesSelectionNotifyEvent *)&xe;
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x11CBXFixesSelectionNotify(*sne);
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return true;
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}
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break;
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}
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return false;
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}
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bool x11CBInit()
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{
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x11cb.aCurSelection = BadValue;
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for(int i = 0; i < LG_CLIPBOARD_DATA_NONE; ++i)
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{
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x11cb.aTypes[i] = XInternAtom(x11.display, atomTypes[i], False);
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if (x11cb.aTypes[i] == BadAlloc || x11cb.aTypes[i] == BadValue)
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{
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DEBUG_ERROR("failed to get atom for type: %s", atomTypes[i]);
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return false;
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}
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}
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// use xfixes to get clipboard change notifications
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if (!XFixesQueryExtension(x11.display, &x11.eventBase, &x11.errorBase))
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{
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DEBUG_ERROR("failed to initialize xfixes");
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return false;
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}
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XFixesSelectSelectionInput(x11.display, x11.window,
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XA_PRIMARY, XFixesSetSelectionOwnerNotifyMask);
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XFixesSelectSelectionInput(x11.display, x11.window,
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x11atoms.CLIPBOARD, XFixesSetSelectionOwnerNotifyMask);
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return true;
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}
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static void x11CBReplyFn(void * opaque, LG_ClipboardData type,
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uint8_t * data, uint32_t size)
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{
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XEvent *s = (XEvent *)opaque;
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XChangeProperty(
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x11.display ,
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s->xselection.requestor,
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s->xselection.property ,
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s->xselection.target ,
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8,
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PropModeReplace,
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data,
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size);
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XSendEvent(x11.display, s->xselection.requestor, 0, 0, s);
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XFlush(x11.display);
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free(s);
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}
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static void x11CBSelectionRequest(const XSelectionRequestEvent e)
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{
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XEvent * s = (XEvent *)malloc(sizeof(XEvent));
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s->xselection.type = SelectionNotify;
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s->xselection.requestor = e.requestor;
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s->xselection.selection = e.selection;
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s->xselection.target = e.target;
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s->xselection.property = e.property;
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s->xselection.time = e.time;
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if (!x11cb.haveRequest)
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goto nodata;
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// target list requested
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if (e.target == x11atoms.TARGETS)
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{
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Atom targets[2];
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targets[0] = x11atoms.TARGETS;
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targets[1] = x11cb.aTypes[x11cb.type];
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XChangeProperty(
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e.display,
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e.requestor,
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e.property,
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XA_ATOM,
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32,
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PropModeReplace,
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(unsigned char*)targets,
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sizeof(targets) / sizeof(Atom));
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goto send;
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}
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// look to see if we can satisfy the data type
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for(int i = 0; i < LG_CLIPBOARD_DATA_NONE; ++i)
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if (x11cb.aTypes[i] == e.target && x11cb.type == i)
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{
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// request the data
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app_clipboardRequest(x11CBReplyFn, s);
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return;
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}
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nodata:
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// report no data
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s->xselection.property = None;
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send:
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XSendEvent(x11.display, e.requestor, 0, 0, s);
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XFlush(x11.display);
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free(s);
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}
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static void x11CBSelectionClear(const XSelectionClearEvent e)
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{
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if (e.selection != XA_PRIMARY && e.selection != x11atoms.CLIPBOARD)
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return;
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x11cb.aCurSelection = BadValue;
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app_clipboardRelease();
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return;
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}
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static void x11CBSelectionIncr(const XPropertyEvent e)
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{
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Atom type;
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int format;
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unsigned long itemCount, after;
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unsigned char *data;
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if (XGetWindowProperty(
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e.display,
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e.window,
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e.atom,
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0, ~0L, // start and length
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True, // delete the property
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x11atoms.INCR,
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&type,
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&format,
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&itemCount,
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&after,
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&data) != Success)
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{
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DEBUG_INFO("GetProp Failed");
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app_clipboardNotify(LG_CLIPBOARD_DATA_NONE, 0);
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goto out;
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}
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LG_ClipboardData dataType;
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for(dataType = 0; dataType < LG_CLIPBOARD_DATA_NONE; ++dataType)
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if (x11cb.aTypes[dataType] == type)
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break;
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if (dataType == LG_CLIPBOARD_DATA_NONE)
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{
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DEBUG_WARN("clipboard data (%s) not in a supported format",
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XGetAtomName(x11.display, type));
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x11cb.lowerBound = 0;
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app_clipboardNotify(LG_CLIPBOARD_DATA_NONE, 0);
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goto out;
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}
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if (x11cb.incrStart)
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{
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app_clipboardNotify(dataType, x11cb.lowerBound);
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x11cb.incrStart = false;
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}
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XFree(data);
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data = NULL;
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if (XGetWindowProperty(
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e.display,
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e.window,
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e.atom,
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0, ~0L, // start and length
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True, // delete the property
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type,
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&type,
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&format,
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&itemCount,
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&after,
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&data) != Success)
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{
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DEBUG_ERROR("XGetWindowProperty Failed");
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app_clipboardNotify(LG_CLIPBOARD_DATA_NONE, 0);
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goto out;
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}
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app_clipboardData(dataType, data, itemCount);
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x11cb.lowerBound -= itemCount;
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out:
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if (data)
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XFree(data);
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}
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static void x11CBXFixesSelectionNotify(const XFixesSelectionNotifyEvent e)
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{
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// check if the selection is valid and it isn't ourself
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if ((e.selection != XA_PRIMARY && e.selection != x11atoms.CLIPBOARD) ||
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e.owner == x11.window || e.owner == 0)
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{
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return;
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}
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// remember which selection we are working with
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x11cb.aCurSelection = e.selection;
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XConvertSelection(
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x11.display,
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e.selection,
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x11atoms.TARGETS,
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x11atoms.TARGETS,
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x11.window,
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CurrentTime);
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return;
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}
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static void x11CBSelectionNotify(const XSelectionEvent e)
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{
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if (e.property == None)
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return;
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Atom type;
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int format;
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unsigned long itemCount, after;
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unsigned char *data;
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if (XGetWindowProperty(
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e.display,
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e.requestor,
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e.property,
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0, ~0L, // start and length
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True , // delete the property
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AnyPropertyType,
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&type,
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&format,
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&itemCount,
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&after,
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&data) != Success)
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{
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app_clipboardNotify(LG_CLIPBOARD_DATA_NONE, 0);
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goto out;
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}
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if (type == x11atoms.INCR)
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{
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x11cb.incrStart = true;
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x11cb.lowerBound = *(unsigned int *)data;
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goto out;
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}
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// the target list
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if (e.property == x11atoms.TARGETS)
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{
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// the format is 32-bit and we must have data
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// this is technically incorrect however as it's
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// an array of padded 64-bit values
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if (!data || format != 32)
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goto out;
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// see if we support any of the targets listed
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const uint64_t * targets = (const uint64_t *)data;
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for(unsigned long i = 0; i < itemCount; ++i)
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{
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for(int n = 0; n < LG_CLIPBOARD_DATA_NONE; ++n)
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if (x11cb.aTypes[n] == targets[i])
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{
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// we have a match, so send the notification
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app_clipboardNotify(n, 0);
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goto out;
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}
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}
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// no matches
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app_clipboardNotify(LG_CLIPBOARD_DATA_NONE, 0);
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goto out;
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}
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if (e.property == x11atoms.SEL_DATA)
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{
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LG_ClipboardData dataType;
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for(dataType = 0; dataType < LG_CLIPBOARD_DATA_NONE; ++dataType)
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if (x11cb.aTypes[dataType] == type)
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break;
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if (dataType == LG_CLIPBOARD_DATA_NONE)
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{
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DEBUG_WARN("clipboard data (%s) not in a supported format",
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XGetAtomName(x11.display, type));
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goto out;
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}
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app_clipboardData(dataType, data, itemCount);
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goto out;
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}
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out:
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if (data)
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XFree(data);
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}
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void x11CBNotice(LG_ClipboardData type)
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{
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x11cb.haveRequest = true;
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x11cb.type = type;
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XSetSelectionOwner(x11.display, XA_PRIMARY , x11.window, CurrentTime);
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XSetSelectionOwner(x11.display, x11atoms.CLIPBOARD, x11.window, CurrentTime);
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XFlush(x11.display);
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}
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void x11CBRelease(void)
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{
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x11cb.haveRequest = false;
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XSetSelectionOwner(x11.display, XA_PRIMARY , None, CurrentTime);
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XSetSelectionOwner(x11.display, x11atoms.CLIPBOARD, None, CurrentTime);
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XFlush(x11.display);
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}
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void x11CBRequest(LG_ClipboardData type)
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{
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if (x11cb.aCurSelection == BadValue)
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return;
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XConvertSelection(
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x11.display,
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x11cb.aCurSelection,
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x11cb.aTypes[type],
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x11atoms.SEL_DATA,
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x11.window,
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CurrentTime);
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}
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