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126 lines
3.5 KiB
126 lines
3.5 KiB
/****************************************************************************
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**
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** Example application showing how to use TQt and TQt OpenGL Extension on an
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** X11 overlay visual
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**
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** Copyright (C) 1999-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <ntqapplication.h>
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#include "gearwidget.h"
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#include "rubberbandwidget.h"
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#if defined(Q_WS_X11)
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#include <X11/Xlib.h>
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#endif
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TQColor findOverlayTransparentColor()
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{
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TQColor invalidColor;
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#if defined(Q_WS_X11)
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Display* appDisplay;
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Visual* appVisual;
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// The static methods are called 'App' in TQt 2.x
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#if TQT_VERSION < 200
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appDisplay = TQPaintDevice::x__Display();
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appVisual = (Visual*)TQPaintDevice::x11Visual();
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#else
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appDisplay = TQPaintDevice::x11AppDisplay();
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appVisual = (Visual*)TQPaintDevice::x11AppVisual();
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#endif
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qDebug( "Default Visual ID: 0x%x", (int)XVisualIDFromVisual(appVisual) );
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typedef struct OverlayProp {
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long visual;
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long type;
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long value;
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long layer;
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} OverlayProp;
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TQWidget* rootWin = TQApplication::desktop();
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if ( !rootWin )
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return invalidColor; // Should not happen
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Atom overlayVisualsAtom = XInternAtom( appDisplay,
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"SERVER_OVERLAY_VISUALS", True );
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if ( overlayVisualsAtom == None ) {
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warning( "Server has no overlay visuals" );
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return invalidColor;
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}
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Atom actualType;
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int actualFormat;
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ulong nItems;
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ulong bytesAfter;
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OverlayProp* overlayProp;
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int res = XGetWindowProperty( appDisplay, TQApplication::desktop()->winId(),
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overlayVisualsAtom, 0, 10000, False,
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overlayVisualsAtom, &actualType,
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&actualFormat, &nItems, &bytesAfter,
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(uchar**)&overlayProp );
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if ( res != Success || actualType != overlayVisualsAtom
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|| actualFormat != 32 || nItems < 4 ) {
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warning( "Failed to get overlay visual property from server" );
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return invalidColor;
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}
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for ( uint i = 0; i < nItems/4; i++ ) {
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if ( (VisualID)overlayProp[i].visual == XVisualIDFromVisual(appVisual)
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&& overlayProp[i].type == 1 )
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return TQColor( tqRgb( 1, 2, 3 ), overlayProp[i].value );
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}
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qWarning( "Default visual is not in overlay plane" );
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return invalidColor;
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#else // defined(Q_WS_X11)
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qWarning( "Wrong window system - Only X11 has overlay support." );
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return invalidColor;
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#endif
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}
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int main( int argc, char **argv )
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{
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TQApplication::setColorSpec( TQApplication::CustomColor );
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TQApplication a( argc, argv );
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if ( !TQGLFormat::hasOpenGL() ) {
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qWarning( "This system has no OpenGL support. Exiting." );
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return -1;
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}
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TQColor transparentColor = findOverlayTransparentColor();
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if ( !transparentColor.isValid() ) {
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qWarning( "Failed to get transparent color for overlay. Exiting." );
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return -1;
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}
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TQWidget top;
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a.setMainWidget( &top );
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top.setGeometry( 50, 50, 600, 400 );
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// Make an OpenGL widget. It will use the deepest visual available
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// (typically a TrueColor visual), which typically is in the normal layer.
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GearWidget g( &top );
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g.setGeometry( 20, 20, 560, 360 );
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// Put the rubberband widget (which uses the default, i.e. overlay visual)
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// on top of the OpenGL widget:
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RubberbandWidget r( transparentColor, &top );
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r.setGeometry( 20, 20, 560, 360 );
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top.show();
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return a.exec();
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}
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