621 lines
16 KiB
C++
621 lines
16 KiB
C++
#include "CXWindowsScreen.h"
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#include "CThread.h"
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#include "CLock.h"
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#include "TMethodJob.h"
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#include "CLog.h"
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#include "CString.h"
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#include <string.h>
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#include <assert.h>
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#include <X11/X.h>
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#include <X11/Xatom.h>
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#include <set>
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//
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// CXWindowsScreen
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//
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CXWindowsScreen::CXWindowsScreen() :
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m_display(NULL),
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m_root(None),
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m_w(0), m_h(0),
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m_stop(false)
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{
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// do nothing
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}
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CXWindowsScreen::~CXWindowsScreen()
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{
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assert(m_display == NULL);
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}
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void CXWindowsScreen::openDisplay()
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{
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assert(m_display == NULL);
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// open the display
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log((CLOG_DEBUG "XOpenDisplay(%s)", "NULL"));
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m_display = XOpenDisplay(NULL); // FIXME -- allow non-default
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if (m_display == NULL)
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throw int(5); // FIXME -- make exception for this
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// get default screen
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m_screen = DefaultScreen(m_display);
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Screen* screen = ScreenOfDisplay(m_display, m_screen);
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// get screen size
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m_w = WidthOfScreen(screen);
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m_h = HeightOfScreen(screen);
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log((CLOG_INFO "display size: %dx%d", m_w, m_h));
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// get the root window
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m_root = RootWindow(m_display, m_screen);
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// get some atoms
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m_atomTargets = XInternAtom(m_display, "TARGETS", False);
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m_atomMultiple = XInternAtom(m_display, "MULTIPLE", False);
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m_atomData = XInternAtom(m_display, "DESTINATION", False);
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m_atomINCR = XInternAtom(m_display, "INCR", False);
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m_atomText = XInternAtom(m_display, "TEXT", False);
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m_atomCompoundText = XInternAtom(m_display, "COMPOUND_TEXT", False);
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// let subclass prep display
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onOpenDisplay();
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}
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void CXWindowsScreen::closeDisplay()
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{
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assert(m_display != NULL);
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// let subclass close down display
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onCloseDisplay();
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// close the display
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XCloseDisplay(m_display);
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m_display = NULL;
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log((CLOG_DEBUG "closed display"));
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}
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int CXWindowsScreen::getScreen() const
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{
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assert(m_display != NULL);
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return m_screen;
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}
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Window CXWindowsScreen::getRoot() const
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{
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assert(m_display != NULL);
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return m_root;
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}
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void CXWindowsScreen::getScreenSize(
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SInt32* w, SInt32* h) const
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{
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assert(m_display != NULL);
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assert(w != NULL && h != NULL);
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*w = m_w;
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*h = m_h;
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}
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Cursor CXWindowsScreen::createBlankCursor() const
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{
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// this seems just a bit more complicated than really necessary
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// get the closet cursor size to 1x1
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unsigned int w, h;
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XQueryBestCursor(m_display, m_root, 1, 1, &w, &h);
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// make bitmap data for cursor of closet size. since the cursor
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// is blank we can use the same bitmap for shape and mask: all
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// zeros.
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const int size = ((w + 7) >> 3) * h;
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char* data = new char[size];
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memset(data, 0, size);
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// make bitmap
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Pixmap bitmap = XCreateBitmapFromData(m_display, m_root, data, w, h);
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// need an arbitrary color for the cursor
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XColor color;
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color.pixel = 0;
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color.red = color.green = color.blue = 0;
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color.flags = DoRed | DoGreen | DoBlue;
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// make cursor from bitmap
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Cursor cursor = XCreatePixmapCursor(m_display, bitmap, bitmap,
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&color, &color, 0, 0);
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// don't need bitmap or the data anymore
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delete[] data;
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XFreePixmap(m_display, bitmap);
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return cursor;
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}
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bool CXWindowsScreen::getEvent(XEvent* xevent) const
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{
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// wait for an event in a cancellable way and don't lock the
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// display while we're waiting.
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m_mutex.lock();
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while (!m_stop && XPending(m_display) == 0) {
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m_mutex.unlock();
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CThread::sleep(0.05);
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m_mutex.lock();
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}
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if (m_stop) {
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m_mutex.unlock();
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return false;
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}
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else {
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XNextEvent(m_display, xevent);
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m_mutex.unlock();
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return true;
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}
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}
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void CXWindowsScreen::doStop()
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{
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CLock lock(&m_mutex);
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m_stop = true;
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}
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bool CXWindowsScreen::setDisplayClipboard(
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const IClipboard* clipboard,
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Window requestor, Time timestamp)
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{
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CLock lock(&m_mutex);
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XSetSelectionOwner(m_display, XA_PRIMARY, requestor, timestamp);
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if (XGetSelectionOwner(m_display, XA_PRIMARY) == requestor) {
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// we got the selection
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log((CLOG_DEBUG "grabbed clipboard"));
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if (clipboard != NULL) {
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// save clipboard to serve requests
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CClipboard::copy(&m_clipboard, clipboard);
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}
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else {
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// clear clipboard
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if (m_clipboard.open()) {
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m_clipboard.close();
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}
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}
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return true;
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}
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return false;
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}
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void CXWindowsScreen::getDisplayClipboard(
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IClipboard* clipboard,
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Window requestor, Time timestamp) const
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{
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assert(clipboard != NULL);
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assert(requestor != None);
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// clear the clipboard object
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if (!clipboard->open())
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return;
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// block others from using the display while we get the clipboard.
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// in particular, this prevents the event thread from stealing the
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// selection notify event we're expecting.
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CLock lock(&m_mutex);
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// use PRIMARY selection as the "clipboard"
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Atom selection = XA_PRIMARY;
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// ask the selection for all the formats it has. some owners return
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// the TARGETS atom and some the ATOM atom when TARGETS is requested.
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Atom format;
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CString targets;
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if (getDisplayClipboard(selection, m_atomTargets,
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requestor, timestamp, &format, &targets) &&
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(format == m_atomTargets || format == XA_ATOM)) {
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// get each target (that we can interpret). some owners return
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// some targets multiple times in the list so don't try to get
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// those multiple times.
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const Atom* targetAtoms = reinterpret_cast<const Atom*>(targets.data());
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const SInt32 numTargets = targets.size() / sizeof(Atom);
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std::set<IClipboard::EFormat> clipboardFormats;
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std::set<Atom> targets;
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log((CLOG_DEBUG "selection has %d targets", numTargets));
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for (SInt32 i = 0; i < numTargets; ++i) {
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Atom format = targetAtoms[i];
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log((CLOG_DEBUG " source target %d", format));
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// skip already handled targets
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if (targets.count(format) > 0) {
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log((CLOG_DEBUG " skipping handled target %d", format));
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continue;
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}
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// mark this target as done
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targets.insert(format);
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// determine the expected clipboard format
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IClipboard::EFormat expectedFormat = getFormat(format);
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// if we can use the format and we haven't already retrieved
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// it then get it
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if (expectedFormat == IClipboard::kNumFormats) {
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log((CLOG_DEBUG " no format for target", format));
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continue;
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}
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if (clipboardFormats.count(expectedFormat) > 0) {
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log((CLOG_DEBUG " skipping handled format %d", expectedFormat));
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continue;
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}
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CString data;
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if (!getDisplayClipboard(selection, format,
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requestor, timestamp, &format, &data)) {
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log((CLOG_DEBUG " no data for target", format));
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continue;
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}
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// use the actual format, not the expected
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IClipboard::EFormat actualFormat = getFormat(format);
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if (actualFormat == IClipboard::kNumFormats) {
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log((CLOG_DEBUG " no format for target", format));
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continue;
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}
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if (clipboardFormats.count(actualFormat) > 0) {
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log((CLOG_DEBUG " skipping handled format %d", actualFormat));
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continue;
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}
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// add to clipboard and note we've done it
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clipboard->add(actualFormat, data);
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clipboardFormats.insert(actualFormat);
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}
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}
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else {
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// non-ICCCM conforming selection owner. try TEXT format.
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// FIXME
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log((CLOG_DEBUG "selection doesn't support TARGETS, format is %d", format));
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}
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// done with clipboard
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clipboard->close();
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}
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bool CXWindowsScreen::getDisplayClipboard(
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Atom selection, Atom type,
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Window requestor, Time timestamp,
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Atom* outputType, CString* outputData) const
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{
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assert(outputType != NULL);
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assert(outputData != NULL);
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// delete data property
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XDeleteProperty(m_display, requestor, m_atomData);
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// request data conversion
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XConvertSelection(m_display, selection, type,
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m_atomData, requestor, timestamp);
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// wait for the selection notify event. can't just mask out other
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// events because X stupidly doesn't provide a mask for selection
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// events, so we use a predicate to find our event.
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XEvent xevent;
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while (XCheckIfEvent(m_display, &xevent,
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&CXWindowsScreen::findSelectionNotify,
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(XPointer)&requestor) != True) {
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// wait a bit
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CThread::sleep(0.05);
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}
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assert(xevent.type == SelectionNotify);
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assert(xevent.xselection.requestor == requestor);
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// make sure the transfer worked
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Atom property = xevent.xselection.property;
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if (property == None) {
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// cannot convert
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*outputType = type;
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log((CLOG_DEBUG "selection conversion failed for %d", type));
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return false;
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}
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// get the data and discard the property
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SInt32 datumSize;
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CString data;
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bool okay = getData(requestor, property, outputType, &datumSize, &data);
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XDeleteProperty(m_display, requestor, property);
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// fail if we couldn't get the data
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if (!okay) {
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log((CLOG_DEBUG "can't get data for selection format %d", type));
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return false;
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}
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// handle INCR type specially. it means we'll be receiving the data
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// piecemeal so we just loop until we've collected all the data.
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if (*outputType == m_atomINCR) {
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log((CLOG_DEBUG "selection data for format %d is incremental", type));
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// the data is a lower bound on the amount of data to be
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// transferred. use it as a hint to size our buffer.
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UInt32 size;
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switch (datumSize) {
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case 8:
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size = *(reinterpret_cast<const UInt8*>(data.data()));
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break;
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case 16:
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size = *(reinterpret_cast<const UInt16*>(data.data()));
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break;
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case 32:
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size = *(reinterpret_cast<const UInt32*>(data.data()));
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break;
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default:
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assert(0 && "invalid datum size");
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}
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// empty the buffer and reserve the lower bound
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data.erase();
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data.reserve(size);
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// look for property notify events with the following
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PropertyNotifyInfo filter;
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filter.m_window = requestor;
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filter.m_property = property;
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// now enter the INCR loop
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bool error = false;
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*outputType = (Atom)0;
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for (;;) {
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// wait for more data
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while (XCheckIfEvent(m_display, &xevent,
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&CXWindowsScreen::findPropertyNotify,
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(XPointer)&filter) != True) {
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// wait a bit
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CThread::sleep(0.05);
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}
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assert(xevent.type == PropertyNotify);
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assert(xevent.xproperty.window == requestor);
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assert(xevent.xproperty.atom == property);
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// get the additional data then delete the property to
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// ask the clipboard owner for the next chunk.
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Atom newType;
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CString newData;
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okay = getData(requestor, property, &newType, NULL, &newData);
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XDeleteProperty(m_display, requestor, property);
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// transfer has failed if we can't get the data
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if (!okay)
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error = true;
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// a zero length property means we got the last chunk
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if (newData.size() == 0)
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break;
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// if this is the first chunk then save the type. otherwise
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// note that the new type is the same as the first chunk's
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// type. if they're not the the clipboard owner is busted
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// but we have to continue the transfer because there's no
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// way to cancel it.
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if (*outputType == (Atom)0)
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*outputType = newType;
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else if (*outputType != newType)
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error = true;
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// append the data
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data += newData;
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}
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// if there was an error we could say the transferred failed
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// but we'll be liberal in what we accept.
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if (error) {
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log((CLOG_WARN "ICCCM violation by clipboard owner"));
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// return false;
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}
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}
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*outputData = data;
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return true;
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}
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bool CXWindowsScreen::getData(
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Window window, Atom property,
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Atom* type, SInt32* datumSize,
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CString* data) const
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{
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assert(type != NULL);
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assert(data != NULL);
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// clear out any existing data
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data->erase();
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// read the property
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long offset = 0;
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long length = 8192 / 4;
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for (;;) {
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// get more data
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int actualDatumSize;
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unsigned long numItems, bytesLeft;
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unsigned char* rawData;
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const int result = XGetWindowProperty(m_display, window, property,
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offset, length, False, AnyPropertyType,
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type, &actualDatumSize,
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&numItems, &bytesLeft,
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&rawData);
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if (result != Success) {
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// failed
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return false;
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}
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// save datum size
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if (datumSize != NULL)
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*datumSize = (SInt32)actualDatumSize;
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const SInt32 bytesPerDatum = (SInt32)actualDatumSize / 8;
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// advance read pointer. since we can only read at offsets that
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// are multiples of 4 byte we take care to write multiples of 4
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// bytes to data, except when we've retrieved the last chunk.
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SInt32 quadCount = (numItems * bytesPerDatum) / 4;
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offset += quadCount;
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// append data
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if (bytesLeft == 0)
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data->append((char*)rawData, bytesPerDatum * numItems);
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else
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data->append((char*)rawData, 4 * quadCount);
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// done with returned data
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XFree(rawData);
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// done if no data is left
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if (bytesLeft == 0)
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return true;
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}
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}
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IClipboard::EFormat CXWindowsScreen::getFormat(Atom src) const
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{
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// FIXME -- handle more formats (especially mime-type-like formats
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// and various character encodings like unicode).
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if (src == XA_STRING ||
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src == m_atomText ||
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src == m_atomCompoundText)
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return IClipboard::kText;
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return IClipboard::kNumFormats;
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}
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Bool CXWindowsScreen::findSelectionNotify(
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Display*, XEvent* xevent, XPointer arg)
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{
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Window requestor = *((Window*)arg);
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return (xevent->type == SelectionNotify &&
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xevent->xselection.requestor == requestor) ? True : False;
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}
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Bool CXWindowsScreen::findPropertyNotify(
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Display*, XEvent* xevent, XPointer arg)
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{
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PropertyNotifyInfo* filter = (PropertyNotifyInfo*)arg;
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return (xevent->type == PropertyNotify &&
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xevent->xproperty.window == filter->m_window &&
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xevent->xproperty.atom == filter->m_property &&
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xevent->xproperty.state == PropertyNewValue) ? True : False;
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}
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void CXWindowsScreen::addClipboardRequest(
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Window /*owner*/, Window requestor,
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Atom selection, Atom target,
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Atom property, Time time)
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{
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// mutex the display
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CLock lock(&m_mutex);
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// check the target
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IClipboard::EFormat format = IClipboard::kNumFormats;
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if (selection == XA_PRIMARY) {
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if (target == m_atomTargets) {
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// send the list of available targets
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sendClipboardTargetsNotify(requestor, property, time);
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return;
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}
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else if (target == m_atomMultiple) {
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// add a multiple request
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if (property != None) {
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addClipboardMultipleRequest(requestor, property, time);
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return;
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}
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}
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else {
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format = getFormat(target);
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}
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}
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// if we can't handle the format then send a failure notification
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if (format == IClipboard::kNumFormats) {
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XEvent event;
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event.xselection.type = SelectionNotify;
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event.xselection.display = m_display;
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event.xselection.requestor = requestor;
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event.xselection.selection = selection;
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event.xselection.target = target;
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event.xselection.property = None;
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event.xselection.time = time;
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XSendEvent(m_display, requestor, False, 0, &event);
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return;
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}
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// we could process short requests without adding to the request
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// queue but we'll keep things simple by doing all requests the
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// same way.
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// FIXME
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}
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void CXWindowsScreen::sendClipboardTargetsNotify(
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Window requestor,
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Atom property, Time time)
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{
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// construct response
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// FIXME
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|
|
// set property
|
|
// FIXME
|
|
|
|
// send notification
|
|
XEvent event;
|
|
event.xselection.type = SelectionNotify;
|
|
event.xselection.display = m_display;
|
|
event.xselection.requestor = requestor;
|
|
event.xselection.selection = XA_PRIMARY;
|
|
event.xselection.target = m_atomTargets;
|
|
event.xselection.property = property;
|
|
event.xselection.time = time;
|
|
XSendEvent(m_display, requestor, False, 0, &event);
|
|
}
|
|
|
|
void CXWindowsScreen::processClipboardRequest(
|
|
Window requestor,
|
|
Atom property, Time time)
|
|
{
|
|
// FIXME
|
|
}
|
|
|
|
void CXWindowsScreen::addClipboardRequest(
|
|
Window requestor,
|
|
Atom property, Time time,
|
|
IClipboard::EFormat format)
|
|
{
|
|
// FIXME
|
|
}
|
|
|
|
void CXWindowsScreen::addClipboardMultipleRequest(
|
|
Window requestor,
|
|
Atom property, Time time)
|
|
{
|
|
// FIXME
|
|
}
|
|
|
|
|
|
//
|
|
// CXWindowsScreen::CDisplayLock
|
|
//
|
|
|
|
CXWindowsScreen::CDisplayLock::CDisplayLock(const CXWindowsScreen* screen) :
|
|
m_mutex(&screen->m_mutex),
|
|
m_display(screen->m_display)
|
|
{
|
|
assert(m_display != NULL);
|
|
|
|
m_mutex->lock();
|
|
}
|
|
|
|
CXWindowsScreen::CDisplayLock::~CDisplayLock()
|
|
{
|
|
m_mutex->unlock();
|
|
}
|
|
|
|
CXWindowsScreen::CDisplayLock::operator Display*() const
|
|
{
|
|
return m_display;
|
|
}
|