LookingGlass/client/displayservers/X11/clipboard.c

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/**
* Looking Glass
2022-01-05 08:42:46 +00:00
* Copyright © 2017-2022 The Looking Glass Authors
* https://looking-glass.io
*
* This program 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 program 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 program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "clipboard.h"
#include "x11.h"
#include "atoms.h"
#include <string.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include "app.h"
#include "common/debug.h"
struct X11ClipboardState
{
Atom aCurSelection;
Atom aTypes[LG_CLIPBOARD_DATA_NONE];
LG_ClipboardData type;
bool haveRequest;
bool incrStart;
unsigned int lowerBound;
};
static const char * atomTypes[] =
{
"UTF8_STRING",
"image/png",
"image/bmp",
"image/tiff",
"image/jpeg"
};
static struct X11ClipboardState x11cb;
// forwards
static void x11CBSelectionRequest(const XSelectionRequestEvent e);
static void x11CBSelectionClear(const XSelectionClearEvent e);
static void x11CBSelectionIncr(const XPropertyEvent e);
static void x11CBSelectionNotify(const XSelectionEvent e);
static void x11CBXFixesSelectionNotify(const XFixesSelectionNotifyEvent e);
bool x11CBEventThread(const XEvent xe)
{
switch(xe.type)
{
case SelectionRequest:
x11CBSelectionRequest(xe.xselectionrequest);
return true;
case SelectionClear:
x11CBSelectionClear(xe.xselectionclear);
return true;
case SelectionNotify:
x11CBSelectionNotify(xe.xselection);
return true;
case PropertyNotify:
if (xe.xproperty.state != PropertyNewValue)
break;
if (xe.xproperty.atom == x11atoms.SEL_DATA)
{
if (x11cb.lowerBound == 0)
return true;
x11CBSelectionIncr(xe.xproperty);
return true;
}
break;
default:
if (xe.type == x11.eventBase + XFixesSelectionNotify)
{
XFixesSelectionNotifyEvent * sne = (XFixesSelectionNotifyEvent *)&xe;
x11CBXFixesSelectionNotify(*sne);
return true;
}
break;
}
return false;
}
bool x11CBInit(void)
{
x11cb.aCurSelection = BadValue;
for(int i = 0; i < LG_CLIPBOARD_DATA_NONE; ++i)
{
x11cb.aTypes[i] = XInternAtom(x11.display, atomTypes[i], False);
if (x11cb.aTypes[i] == BadAlloc || x11cb.aTypes[i] == BadValue)
{
DEBUG_ERROR("failed to get atom for type: %s", atomTypes[i]);
return false;
}
}
// use xfixes to get clipboard change notifications
if (!XFixesQueryExtension(x11.display, &x11.eventBase, &x11.errorBase))
{
DEBUG_ERROR("failed to initialize xfixes");
return false;
}
XFixesSelectSelectionInput(x11.display, x11.window,
x11atoms.CLIPBOARD, XFixesSetSelectionOwnerNotifyMask);
return true;
}
static void x11CBReplyFn(void * opaque, LG_ClipboardData type,
uint8_t * data, uint32_t size)
{
XEvent *s = (XEvent *)opaque;
XChangeProperty(
x11.display ,
s->xselection.requestor,
s->xselection.property ,
s->xselection.target ,
8,
PropModeReplace,
data,
size);
XSendEvent(x11.display, s->xselection.requestor, 0, 0, s);
XFlush(x11.display);
free(s);
}
static void x11CBSelectionRequest(const XSelectionRequestEvent e)
{
XEvent * s = malloc(sizeof(*s));
if (!s)
{
DEBUG_ERROR("out of memory");
return;
}
s->xselection.type = SelectionNotify;
s->xselection.requestor = e.requestor;
s->xselection.selection = e.selection;
s->xselection.target = e.target;
s->xselection.property = e.property;
s->xselection.time = e.time;
if (!x11cb.haveRequest)
goto nodata;
// target list requested
if (e.target == x11atoms.TARGETS)
{
Atom targets[2];
targets[0] = x11atoms.TARGETS;
targets[1] = x11cb.aTypes[x11cb.type];
XChangeProperty(
e.display,
e.requestor,
e.property,
XA_ATOM,
32,
PropModeReplace,
(unsigned char*)targets,
sizeof(targets) / sizeof(Atom));
goto send;
}
// look to see if we can satisfy the data type
for(int i = 0; i < LG_CLIPBOARD_DATA_NONE; ++i)
if (x11cb.aTypes[i] == e.target && x11cb.type == i)
{
// request the data
app_clipboardRequest(x11CBReplyFn, s);
return;
}
nodata:
// report no data
s->xselection.property = None;
send:
XSendEvent(x11.display, e.requestor, 0, 0, s);
XFlush(x11.display);
free(s);
}
static void x11CBSelectionClear(const XSelectionClearEvent e)
{
if (e.selection != x11atoms.CLIPBOARD)
return;
x11cb.aCurSelection = BadValue;
app_clipboardRelease();
return;
}
static void x11CBSelectionIncr(const XPropertyEvent e)
{
Atom type;
int format;
unsigned long itemCount, after;
unsigned char *data;
if (XGetWindowProperty(
e.display,
e.window,
e.atom,
0, ~0L, // start and length
True, // delete the property
x11atoms.INCR,
&type,
&format,
&itemCount,
&after,
&data) != Success)
{
DEBUG_INFO("GetProp Failed");
app_clipboardNotifySize(LG_CLIPBOARD_DATA_NONE, 0);
goto out;
}
LG_ClipboardData dataType;
for(dataType = 0; dataType < LG_CLIPBOARD_DATA_NONE; ++dataType)
if (x11cb.aTypes[dataType] == type)
break;
if (dataType == LG_CLIPBOARD_DATA_NONE)
{
DEBUG_WARN("clipboard data (%s) not in a supported format",
XGetAtomName(x11.display, type));
x11cb.lowerBound = 0;
app_clipboardNotifySize(LG_CLIPBOARD_DATA_NONE, 0);
goto out;
}
if (x11cb.incrStart)
{
app_clipboardNotifySize(dataType, x11cb.lowerBound);
x11cb.incrStart = false;
}
XFree(data);
data = NULL;
if (XGetWindowProperty(
e.display,
e.window,
e.atom,
0, ~0L, // start and length
True, // delete the property
type,
&type,
&format,
&itemCount,
&after,
&data) != Success)
{
DEBUG_ERROR("XGetWindowProperty Failed");
app_clipboardNotifySize(LG_CLIPBOARD_DATA_NONE, 0);
goto out;
}
app_clipboardData(dataType, data, itemCount);
x11cb.lowerBound -= itemCount;
out:
if (data)
XFree(data);
}
static void x11CBXFixesSelectionNotify(const XFixesSelectionNotifyEvent e)
{
// check if the selection is valid and it isn't ourself
if (e.selection != x11atoms.CLIPBOARD ||
e.owner == x11.window || e.owner == 0)
{
return;
}
// remember which selection we are working with
x11cb.aCurSelection = e.selection;
XConvertSelection(
x11.display,
e.selection,
x11atoms.TARGETS,
x11atoms.TARGETS,
x11.window,
CurrentTime);
return;
}
static void x11CBSelectionNotify(const XSelectionEvent e)
{
if (e.property == None)
return;
Atom type;
int format;
unsigned long itemCount, after;
unsigned char *data;
if (XGetWindowProperty(
e.display,
e.requestor,
e.property,
0, ~0L, // start and length
True , // delete the property
AnyPropertyType,
&type,
&format,
&itemCount,
&after,
&data) != Success)
{
app_clipboardNotifySize(LG_CLIPBOARD_DATA_NONE, 0);
goto out;
}
if (type == x11atoms.INCR)
{
x11cb.incrStart = true;
x11cb.lowerBound = *(unsigned int *)data;
goto out;
}
// the target list
if (e.property == x11atoms.TARGETS)
{
// the format is 32-bit and we must have data
// this is technically incorrect however as it's
// an array of padded 64-bit values
if (!data || format != 32)
goto out;
int typeCount = 0;
LG_ClipboardData types[itemCount];
// see if we support any of the targets listed
const uint64_t * targets = (const uint64_t *)data;
for(unsigned long i = 0; i < itemCount; ++i)
{
for(int n = 0; n < LG_CLIPBOARD_DATA_NONE; ++n)
if (x11cb.aTypes[n] == targets[i])
types[typeCount++] = n;
}
app_clipboardNotifyTypes(types, typeCount);
goto out;
}
if (e.property == x11atoms.SEL_DATA)
{
LG_ClipboardData dataType;
for(dataType = 0; dataType < LG_CLIPBOARD_DATA_NONE; ++dataType)
if (x11cb.aTypes[dataType] == type)
break;
if (dataType == LG_CLIPBOARD_DATA_NONE)
{
DEBUG_WARN("clipboard data (%s) not in a supported format",
XGetAtomName(x11.display, type));
goto out;
}
app_clipboardData(dataType, data, itemCount);
goto out;
}
out:
if (data)
XFree(data);
}
void x11CBNotice(LG_ClipboardData type)
{
x11cb.haveRequest = true;
x11cb.type = type;
XSetSelectionOwner(x11.display, x11atoms.CLIPBOARD, x11.window, CurrentTime);
XFlush(x11.display);
}
void x11CBRelease(void)
{
x11cb.haveRequest = false;
XSetSelectionOwner(x11.display, x11atoms.CLIPBOARD, None, CurrentTime);
XFlush(x11.display);
}
void x11CBRequest(LG_ClipboardData type)
{
if (x11cb.aCurSelection == BadValue)
return;
XConvertSelection(
x11.display,
x11cb.aCurSelection,
x11cb.aTypes[type],
x11atoms.SEL_DATA,
x11.window,
CurrentTime);
}