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https://github.com/debauchee/barrier.git
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189537b8b9
CXWindowsUtil that installs/uninstalls an X error hander. using that in primary screen, clipboard, and util to ensure that certain errors don't kill the app.
239 lines
5.6 KiB
C++
239 lines
5.6 KiB
C++
#include "CXWindowsUtil.h"
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#include "CLog.h"
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#include "CThread.h"
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#include <assert.h>
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#include <X11/Xatom.h>
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//
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// CXWindowsUtil
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//
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bool CXWindowsUtil::getWindowProperty(
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Display* display,
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Window window, Atom property,
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CString* data, Atom* type,
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int* format, bool deleteProperty)
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{
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assert(display != NULL);
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assert(data != NULL);
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Atom actualType;
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int actualDatumSize;
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// ignore errors. XGetWindowProperty() will report failure.
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CXWindowsUtil::CErrorLock lock;
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// read the property
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const long length = XMaxRequestSize(display);
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long offset = 0;
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unsigned long bytesLeft = 1;
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while (bytesLeft != 0) {
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// get more data
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unsigned long numItems;
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unsigned char* rawData;
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const int result = XGetWindowProperty(display, window, property,
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offset, length, False, AnyPropertyType,
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&actualType, &actualDatumSize,
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&numItems, &bytesLeft, &rawData);
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if (result != Success || actualType == None || actualDatumSize == 0) {
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// failed
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return false;
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}
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// compute bytes read and advance offset
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unsigned long numBytes;
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switch (actualDatumSize) {
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case 8:
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default:
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numBytes = numItems;
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offset += numItems / 4;
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break;
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case 16:
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numBytes = 2 * numItems;
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offset += numItems / 2;
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break;
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case 32:
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numBytes = 4 * numItems;
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offset += numItems;
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break;
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}
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// append data
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data->append((char*)rawData, numBytes);
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// done with returned data
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XFree(rawData);
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}
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// delete the property if requested
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if (deleteProperty) {
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XDeleteProperty(display, window, property);
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}
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// save property info
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if (type != NULL) {
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*type = actualType;
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}
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if (format != NULL) {
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*format = static_cast<SInt32>(actualDatumSize);
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}
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log((CLOG_DEBUG1 "read property %d on window 0x%08x: bytes=%d", property, window, data->size()));
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return true;
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}
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bool CXWindowsUtil::setWindowProperty(
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Display* display,
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Window window, Atom property,
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const void* vdata, UInt32 size,
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Atom type, SInt32 format)
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{
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const UInt32 length = 4 * XMaxRequestSize(display);
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const unsigned char* data = reinterpret_cast<const unsigned char*>(vdata);
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const UInt32 datumSize = static_cast<UInt32>(format / 8);
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// save errors
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bool error = false;
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CXWindowsUtil::CErrorLock lock(&error);
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// how much data to send in first chunk?
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UInt32 chunkSize = size;
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if (chunkSize > length)
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chunkSize = length;
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// send first chunk
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XChangeProperty(display, window, property,
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type, format, PropModeReplace,
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data, chunkSize / datumSize);
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// append remaining chunks
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data += chunkSize;
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size -= chunkSize;
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while (!error && size > 0) {
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chunkSize = size;
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if (chunkSize > length)
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chunkSize = length;
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XChangeProperty(display, window, property,
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type, format, PropModeAppend,
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data, chunkSize / datumSize);
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data += chunkSize;
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size -= chunkSize;
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}
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return !error;
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}
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Time CXWindowsUtil::getCurrentTime(
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Display* display, Window window)
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{
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// select property events on window
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XWindowAttributes attr;
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XGetWindowAttributes(display, window, &attr);
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XSelectInput(display, window, attr.your_event_mask | PropertyChangeMask);
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// make a property name to receive dummy change
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Atom atom = XInternAtom(display, "TIMESTAMP", False);
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// do a zero-length append to get the current time
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unsigned char dummy;
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XChangeProperty(display, window, atom,
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XA_INTEGER, 8,
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PropModeAppend,
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&dummy, 0);
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// look for property notify events with the following
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CPropertyNotifyPredicateInfo filter;
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filter.m_window = window;
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filter.m_property = atom;
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// wait for reply
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XEvent xevent;
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while (XCheckIfEvent(display, &xevent,
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&CXWindowsUtil::propertyNotifyPredicate,
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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 == window);
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assert(xevent.xproperty.atom == atom);
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// restore event mask
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XSelectInput(display, window, attr.your_event_mask);
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return xevent.xproperty.time;
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}
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Bool CXWindowsUtil::propertyNotifyPredicate(
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Display*, XEvent* xevent, XPointer arg)
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{
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CPropertyNotifyPredicateInfo* filter =
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reinterpret_cast<CPropertyNotifyPredicateInfo*>(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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//
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// CXWindowsUtil::CErrorLock
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//
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CXWindowsUtil::CErrorLock* CXWindowsUtil::CErrorLock::s_top = NULL;
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CXWindowsUtil::CErrorLock::CErrorLock()
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{
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install(&CXWindowsUtil::CErrorLock::ignoreHandler, NULL);
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}
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CXWindowsUtil::CErrorLock::CErrorLock(bool* flag)
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{
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install(&CXWindowsUtil::CErrorLock::saveHandler, flag);
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}
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CXWindowsUtil::CErrorLock::CErrorLock(ErrorHandler handler, void* data)
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{
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install(handler, data);
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}
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CXWindowsUtil::CErrorLock::~CErrorLock()
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{
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XSetErrorHandler(m_oldXHandler);
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s_top = m_next;
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}
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void CXWindowsUtil::CErrorLock::install(
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ErrorHandler handler, void* data)
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{
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m_handler = handler;
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m_userData = data;
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m_oldXHandler = XSetErrorHandler(
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&CXWindowsUtil::CErrorLock::internalHandler);
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m_next = s_top;
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s_top = this;
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}
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int CXWindowsUtil::CErrorLock::internalHandler(
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Display* display, XErrorEvent* event)
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{
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if (s_top != NULL && s_top->m_handler != NULL) {
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s_top->m_handler(display, event, s_top->m_userData);
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}
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return 0;
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}
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void CXWindowsUtil::CErrorLock::ignoreHandler(
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Display*, XErrorEvent*, void*)
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{
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// do nothing
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}
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void CXWindowsUtil::CErrorLock::saveHandler(
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Display*, XErrorEvent*, void* flag)
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{
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*reinterpret_cast<bool*>(flag) = true;
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}
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