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tigervnc/vncviewer_unix/DesktopWindow.cxx
Constantin Kaplinsky 47ed8d321c Initial revision 
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2 3789f03b-4d11-0410-bbf8-ca57d06f2519
2004-10-08 09:43:57 +00:00

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/* Copyright (C) 2002-2004 RealVNC Ltd. All Rights Reserved.
*
* 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.
*/
//
// DesktopWindow.cxx
//
#include "DesktopWindow.h"
#include "CConn.h"
#include <rfb/CMsgWriter.h>
#include <rfb/LogWriter.h>
#include <X11/keysym.h>
#include <X11/Xatom.h>
#include <stdio.h>
#include <string.h>
#include "parameters.h"
#ifndef XK_ISO_Left_Tab
#define XK_ISO_Left_Tab 0xFE20
#endif
static rdr::U8 reverseBits[] = {
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0,
0x30, 0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4,
0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc,
0x3c, 0xbc, 0x7c, 0xfc, 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca,
0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6,
0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81, 0x41, 0xc1,
0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9,
0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd,
0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3,
0x33, 0xb3, 0x73, 0xf3, 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7,
0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf,
0x3f, 0xbf, 0x7f, 0xff
};
using namespace rfb;
static rfb::LogWriter vlog("DesktopWindow");
DesktopWindow::DesktopWindow(Display* dpy, int w, int h,
const rfb::PixelFormat& serverPF,
CConn* cc_, TXWindow* parent)
: TXWindow(dpy, w, h, parent), cc(cc_), im(0),
cursorVisible(false), cursorAvailable(false), currentSelectionTime(0),
newSelection(0), gettingInitialSelectionTime(true),
newServerCutText(false), serverCutText_(0),
setColourMapEntriesTimer(this), viewport(0),
pointerEventTimer(this), lastPointerX(0), lastPointerY(0),
lastButtonMask(0)
{
setEventHandler(this);
gc = XCreateGC(dpy, win(), 0, 0);
addEventMask(ExposureMask | ButtonPressMask | ButtonReleaseMask |
PointerMotionMask | KeyPressMask | KeyReleaseMask |
EnterWindowMask | LeaveWindowMask);
createXCursors();
XDefineCursor(dpy, win(), dotCursor);
im = new TXImage(dpy, width(), height());
if (!serverPF.trueColour)
im->setPF(serverPF);
XConvertSelection(dpy, sendPrimary ? XA_PRIMARY : xaCLIPBOARD, xaTIMESTAMP,
xaSELECTION_TIME, win(), CurrentTime);
memset(downKeysym, 0, 256*4);
}
DesktopWindow::~DesktopWindow()
{
XFreeGC(dpy, gc);
XFreeCursor(dpy, dotCursor);
XFreeCursor(dpy, noCursor);
if (localXCursor)
XFreeCursor(dpy, localXCursor);
delete im;
}
void DesktopWindow::setViewport(TXViewport* viewport_)
{
viewport = viewport_;
viewport->setChild(this);
}
// Cursor stuff
void DesktopWindow::createXCursors()
{
static char dotSource[] = { 0x00, 0x0e, 0x0e, 0x0e, 0x00 };
static char dotMask[] = { 0x1f, 0x1f, 0x1f, 0x1f, 0x1f };
Pixmap source = XCreateBitmapFromData(dpy, win(), dotSource, 5, 5);
Pixmap mask = XCreateBitmapFromData(dpy, win(), dotMask, 5, 5);
XColor fg, bg;
fg.red = fg.green = fg.blue = 0;
bg.red = bg.green = bg.blue = 0xffff;
dotCursor = XCreatePixmapCursor(dpy, source, mask, &fg, &bg, 2, 2);
XFreePixmap(dpy, source);
XFreePixmap(dpy, mask);
char zero = 0;
Pixmap empty = XCreateBitmapFromData(dpy, win(), &zero, 1, 1);
noCursor = XCreatePixmapCursor(dpy, empty, empty, &fg, &bg, 0, 0);
XFreePixmap(dpy, empty);
localXCursor = 0;
}
void DesktopWindow::setCursor(const Point& hotspot, const Point& size,
void* data, void* mask)
{
if (!useLocalCursor) return;
hideLocalCursor();
int mask_len = ((size.x+7)/8) * size.y;
int i;
for (i = 0; i < mask_len; i++)
if (((rdr::U8*)mask)[i]) break;
if (i == mask_len) {
if (dotWhenNoCursor) {
vlog.debug("cursor is empty - using dot");
XDefineCursor(dpy, win(), dotCursor);
} else {
XDefineCursor(dpy, win(), noCursor);
}
cursorAvailable = false;
return;
}
cursor.hotspot = hotspot;
cursor.setSize(size.x, size.y);
cursor.setPF(getPF());
cursor.imageRect(cursor.getRect(), data);
cursorBacking.setSize(size.x, size.y);
cursorBacking.setPF(getPF());
delete [] cursor.mask.buf;
cursor.mask.buf = new rdr::U8[mask_len];
memcpy(cursor.mask.buf, mask, mask_len);
Pixel pix0, pix1;
rdr::U8Array bitmap(cursor.getBitmap(&pix0, &pix1));
if (bitmap.buf && cursor.getRect().contains(cursor.hotspot)) {
int bytesPerRow = (cursor.width() + 7) / 8;
for (int j = 0; j < cursor.height(); j++) {
for (int i = 0; i < bytesPerRow; i++) {
bitmap.buf[j * bytesPerRow + i]
= reverseBits[bitmap.buf[j * bytesPerRow + i]];
cursor.mask.buf[j * bytesPerRow + i]
= reverseBits[cursor.mask.buf[j * bytesPerRow + i]];
}
}
Pixmap source = XCreateBitmapFromData(dpy, win(), (char*)bitmap.buf,
cursor.width(), cursor.height());
Pixmap mask = XCreateBitmapFromData(dpy, win(), (char*)cursor.mask.buf,
cursor.width(), cursor.height());
Colour rgb;
XColor fg, bg;
getPF().rgbFromPixel(pix1, im->getColourMap(), &rgb);
fg.red = rgb.r; fg.green = rgb.g; fg.blue = rgb.b;
getPF().rgbFromPixel(pix0, im->getColourMap(), &rgb);
bg.red = rgb.r; bg.green = rgb.g; bg.blue = rgb.b;
if (localXCursor)
XFreeCursor(dpy, localXCursor);
localXCursor = XCreatePixmapCursor(dpy, source, mask, &fg, &bg,
cursor.hotspot.x, cursor.hotspot.y);
XDefineCursor(dpy, win(), localXCursor);
XFreePixmap(dpy, source);
XFreePixmap(dpy, mask);
cursorAvailable = false;
return;
}
if (!cursorAvailable) {
XDefineCursor(dpy, win(), noCursor);
cursorAvailable = true;
}
showLocalCursor();
}
void DesktopWindow::resetLocalCursor()
{
hideLocalCursor();
XDefineCursor(dpy, win(), dotCursor);
cursorAvailable = false;
}
void DesktopWindow::hideLocalCursor()
{
// - Blit the cursor backing store over the cursor
if (cursorVisible) {
cursorVisible = false;
im->imageRect(cursorBackingRect, cursorBacking.data);
im->put(win(), gc, cursorBackingRect);
}
}
void DesktopWindow::showLocalCursor()
{
if (cursorAvailable && !cursorVisible) {
if (!getPF().equal(cursor.getPF()) ||
cursor.getRect().is_empty()) {
vlog.error("attempting to render invalid local cursor");
XDefineCursor(dpy, win(), dotCursor);
cursorAvailable = false;
return;
}
cursorVisible = true;
rfb::Rect cursorRect = (cursor.getRect().translate(cursorPos).
translate(cursor.hotspot.negate()));
cursorBackingRect = cursorRect.intersect(im->getRect());
im->getImage(cursorBacking.data, cursorBackingRect);
im->maskRect(cursorRect, cursor.data, cursor.mask.buf);
im->put(win(), gc, cursorBackingRect);
}
}
// setColourMapEntries() changes some of the entries in the colourmap.
// Unfortunately these messages are often sent one at a time, so we delay the
// settings taking effect by 100ms. This is because recalculating the internal
// translation table can be expensive.
void DesktopWindow::setColourMapEntries(int firstColour, int nColours,
rdr::U16* rgbs)
{
im->setColourMapEntries(firstColour, nColours, rgbs);
if (!setColourMapEntriesTimer.isSet())
setColourMapEntriesTimer.reset(100);
}
void DesktopWindow::serverCutText(const char* str, int len)
{
if (acceptClipboard) {
newServerCutText = true;
delete [] serverCutText_;
serverCutText_ = new char[len+1];
memcpy(serverCutText_, str, len);
serverCutText_[len] = 0;
}
}
// Call XSync() at the end of an update. We do this because we'd like to
// ensure that the current update has actually been drawn by the X server
// before the next update arrives - this is necessary for copyRect to
// behave correctly. In particular, if part of the source of a copyRect is
// not actually displayed in the window, then XCopyArea results in
// GraphicsExpose events, which require us to draw from the off-screen
// image. By the time XSync returns, the GraphicsExpose events will be in
// Xlib's queue, so hopefully will be processed before the next update.
// Possibly we should process the GraphicsExpose events here explicitly?
void DesktopWindow::framebufferUpdateEnd()
{
XSync(dpy, False);
}
// invertRect() flips all the bits in every pixel in the given rectangle
void DesktopWindow::invertRect(const Rect& r)
{
int stride;
rdr::U8* p = im->getPixelsRW(r, &stride);
for (int y = 0; y < r.height(); y++) {
for (int x = 0; x < r.width(); x++) {
switch (getPF().bpp) {
case 8: ((rdr::U8* )p)[x+y*stride] ^= 0xff; break;
case 16: ((rdr::U16*)p)[x+y*stride] ^= 0xffff; break;
case 32: ((rdr::U32*)p)[x+y*stride] ^= 0xffffffff; break;
}
}
}
im->put(win(), gc, r);
}
// resize() - resize the window and the image, taking care to remove the local
// cursor first.
void DesktopWindow::resize(int w, int h)
{
hideLocalCursor();
TXWindow::resize(w, h);
im->resize(w, h);
}
void DesktopWindow::timerCallback(Timer* timer)
{
if (timer == &setColourMapEntriesTimer) {
im->updateColourMap();
im->put(win(), gc, im->getRect());
} else if (timer == &pointerEventTimer) {
if (!viewOnly) {
cc->writer()->writePointerEvent(lastPointerX, lastPointerY,
lastButtonMask);
}
}
}
void DesktopWindow::handlePointerEvent(int x, int y, int buttonMask)
{
if (!viewOnly) {
if (pointerEventInterval == 0 || buttonMask != lastButtonMask) {
cc->writer()->writePointerEvent(x, y, buttonMask);
} else {
if (!pointerEventTimer.isSet())
pointerEventTimer.reset(pointerEventInterval);
}
lastPointerX = x;
lastPointerY = y;
lastButtonMask = buttonMask;
}
// - If local cursor rendering is enabled then use it
if (cursorAvailable) {
// - Render the cursor!
Point p(x, y);
if (!p.equals(cursorPos)) {
hideLocalCursor();
if (im->getRect().contains(p)) {
cursorPos = p;
showLocalCursor();
}
}
}
}
// handleXEvent() handles the various X events on the window
void DesktopWindow::handleEvent(TXWindow* w, XEvent* ev)
{
switch (ev->type) {
case GraphicsExpose:
case Expose:
im->put(win(), gc, Rect(ev->xexpose.x, ev->xexpose.y,
ev->xexpose.x + ev->xexpose.width,
ev->xexpose.y + ev->xexpose.height));
break;
case MotionNotify:
while (XCheckTypedWindowEvent(dpy, win(), MotionNotify, ev));
if (viewport && viewport->bumpScrollEvent(&ev->xmotion)) break;
handlePointerEvent(ev->xmotion.x, ev->xmotion.y,
(ev->xmotion.state & 0x1f00) >> 8);
break;
case ButtonPress:
handlePointerEvent(ev->xbutton.x, ev->xbutton.y,
(((ev->xbutton.state & 0x1f00) >> 8) |
(1 << (ev->xbutton.button-1))));
break;
case ButtonRelease:
handlePointerEvent(ev->xbutton.x, ev->xbutton.y,
(((ev->xbutton.state & 0x1f00) >> 8) &
~(1 << (ev->xbutton.button-1))));
break;
case KeyPress:
if (!viewOnly) {
KeySym ks;
char keyname[256];
XLookupString(&ev->xkey, keyname, 256, &ks, NULL);
bool fakeShiftPress = false;
// Turn ISO_Left_Tab into shifted Tab
if (ks == XK_ISO_Left_Tab) {
fakeShiftPress = !(ev->xkey.state & ShiftMask);
ks = XK_Tab;
}
if (fakeShiftPress)
cc->writer()->writeKeyEvent(XK_Shift_L, true);
downKeysym[ev->xkey.keycode] = ks;
cc->writer()->writeKeyEvent(ks, true);
if (fakeShiftPress)
cc->writer()->writeKeyEvent(XK_Shift_L, false);
break;
}
case KeyRelease:
if (!viewOnly) {
if (downKeysym[ev->xkey.keycode]) {
cc->writer()->writeKeyEvent(downKeysym[ev->xkey.keycode], false);
downKeysym[ev->xkey.keycode] = 0;
}
}
break;
case EnterNotify:
newSelection = 0;
if (sendPrimary && !selectionOwner(XA_PRIMARY)) {
XConvertSelection(dpy, XA_PRIMARY, xaTIMESTAMP, xaSELECTION_TIME,
win(), ev->xcrossing.time);
} else if (!selectionOwner(xaCLIPBOARD)) {
XConvertSelection(dpy, xaCLIPBOARD, xaTIMESTAMP, xaSELECTION_TIME,
win(), ev->xcrossing.time);
}
break;
case LeaveNotify:
if (serverCutText_ && newServerCutText) {
newServerCutText = false;
vlog.debug("acquiring primary and clipboard selections");
XStoreBytes(dpy, serverCutText_, strlen(serverCutText_));
ownSelection(XA_PRIMARY, ev->xcrossing.time);
ownSelection(xaCLIPBOARD, ev->xcrossing.time);
currentSelectionTime = ev->xcrossing.time;
}
// Release all keys - this should probably done on a FocusOut event, but
// LeaveNotify is near enough...
for (int i = 8; i < 256; i++) {
if (downKeysym[i]) {
cc->writer()->writeKeyEvent(downKeysym[i], false);
downKeysym[i] = 0;
}
}
break;
}
}
// selectionRequest() is called when we are the selection owner and another X
// client has requested the selection. We simply put the server's cut text
// into the requested property. TXWindow will handle the rest.
bool DesktopWindow::selectionRequest(Window requestor,
Atom selection, Atom property)
{
XChangeProperty(dpy, requestor, property, XA_STRING, 8,
PropModeReplace, (unsigned char*)serverCutText_,
strlen(serverCutText_));
return true;
}
// selectionNotify() is called when we have requested any information about a
// selection from the selection owner. Note that there are two selections,
// PRIMARY and CLIPBOARD, plus the cut buffer, and we try to use whichever is
// the most recent of the three.
//
// There are two different "targets" for which selectionNotify() is called, the
// timestamp and the actual string value of the selection. We always use the
// timestamp to decide which selection to retrieve.
//
// The first time selectionNotify() is called is when we are trying to find the
// timestamp of the selections at initialisation. This should be called first
// for PRIMARY, then we call XConvertSelection() for CLIPBOARD. The second
// time should be the result for CLIPBOARD. At this stage we've got the
// "currentSelectionTime" so we return.
//
// Subsequently selectionNotify() is called whenever the mouse enters the
// viewer window. Again, the first time it is called should be the timestamp
// for PRIMARY, and we then request the timestamp for CLIPBOARD. When
// selectionNotify() is called again with the timestamp for CLIPBOARD, we now
// know if either selection is "new" i.e. later than the previous value of
// currentSelectionTime. The last thing to check is the timestamp on the cut
// buffer. If the cut buffer is newest we send that to the server, otherwise
// if one of the selections was newer, we request the string value of that
// selection.
//
// Finally, if we get selectionNotify() called for the string value of a
// selection, we sent that to the server.
//
// As a final minor complication, when one of the selections is actually owned
// by us, we don't request the details for it.
// TIME_LATER treats 0 as meaning a long time ago, so a==0 means a cannot be
// later than b. This is different to the usual meaning of CurrentTime.
#define TIME_LATER(a, b) ((a) != 0 && ((b) == 0 || (long)((a) - (b)) > 0))
void DesktopWindow::selectionNotify(XSelectionEvent* ev, Atom type, int format,
int nitems, void* data)
{
if (ev->requestor != win())
return;
if (ev->target == xaTIMESTAMP) {
if (ev->property == xaSELECTION_TIME) {
if (data && format == 32 && nitems == 1) {
Time t = *(rdr::U32 *)data;
vlog.debug("selection (%d) time is %d, later %d",
ev->selection, t, TIME_LATER(t, currentSelectionTime));
if (TIME_LATER(t, currentSelectionTime)) {
currentSelectionTime = t;
newSelection = ev->selection;
}
}
} else {
vlog.debug("no selection (%d)",ev->selection);
}
if (ev->selection == XA_PRIMARY) {
if (!selectionOwner(xaCLIPBOARD)) {
XConvertSelection(dpy, xaCLIPBOARD, xaTIMESTAMP, xaSELECTION_TIME,
win(), ev->time);
return;
}
} else if (ev->selection != xaCLIPBOARD) {
vlog.error("unknown selection %d",ev->selection);
return;
}
if (gettingInitialSelectionTime) {
gettingInitialSelectionTime = false;
return;
}
if (!sendClipboard) return;
if (sendPrimary) {
vlog.debug("cut buffer time is %d, later %d", cutBufferTime,
TIME_LATER(cutBufferTime, currentSelectionTime));
if (TIME_LATER(cutBufferTime, currentSelectionTime)) {
currentSelectionTime = cutBufferTime;
int len;
char* str = XFetchBytes(dpy, &len);
if (str) {
if (!viewOnly) {
vlog.debug("sending cut buffer to server");
cc->writer()->writeClientCutText(str, len);
}
XFree(str);
return;
}
}
}
if (newSelection) {
XConvertSelection(dpy, newSelection, XA_STRING, xaSELECTION_STRING,
win(), CurrentTime);
}
} else if (ev->target == XA_STRING) {
if (!sendClipboard) return;
if (ev->property == xaSELECTION_STRING) {
if (data && format == 8) {
if (!viewOnly) {
vlog.debug("sending %s selection to server",
ev->selection == XA_PRIMARY ? "primary" :
ev->selection == xaCLIPBOARD ? "clipboard" : "unknown" );
cc->writer()->writeClientCutText((char*)data, nitems);
}
}
}
}
}
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