File indexing completed on 2024-04-28 16:49:19

 /*
     SPDX-FileCopyrightText: 2016 Martin Gräßlin <mgraesslin@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */
 #include "utils/xcbutils.h"
 
 #include <QApplication>
 #include <QCommandLineParser>
 #include <QDebug>
 #include <QFormLayout>
 #include <QLabel>
 #include <QVBoxLayout>
 #include <QWidget>
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
 #include <private/qtx11extras_p.h>
 #else
 #include <QX11Info>
 #endif
 
 static QVector<uint32_t> readShadow(quint32 windowId)
 {
     KWin::Xcb::Atom atom(QByteArrayLiteral("_KDE_NET_WM_SHADOW"), false, QX11Info::connection());
     QVector<uint32_t> ret;
     if (windowId != XCB_WINDOW) {
         KWin::Xcb::Property property(false, windowId, atom, XCB_ATOM_CARDINAL, 0, 12);
         uint32_t *shadow = property.value<uint32_t *>();
         if (shadow) {
             ret.reserve(12);
             for (int i = 0; i < 12; ++i) {
                 ret << shadow[i];
             }
         } else {
             qDebug() << "!!!! no shadow";
         }
     } else {
         qDebug() << "!!!! no window";
     }
     return ret;
 }
 
 static QVector<QPixmap> getPixmaps(const QVector<uint32_t> &data)
 {
     QVector<QPixmap> ret;
     static const int ShadowElementsCount = 8;
     QVector<KWin::Xcb::WindowGeometry> pixmapGeometries(ShadowElementsCount);
     QVector<xcb_get_image_cookie_t> getImageCookies(ShadowElementsCount);
     auto *c = KWin::connection();
     for (int i = 0; i < ShadowElementsCount; ++i) {
         pixmapGeometries[i] = KWin::Xcb::WindowGeometry(data[i]);
     }
     auto discardReplies = [&getImageCookies](int start) {
         for (int i = start; i < getImageCookies.size(); ++i) {
             xcb_discard_reply(KWin::connection(), getImageCookies.at(i).sequence);
         }
     };
     for (int i = 0; i < ShadowElementsCount; ++i) {
         auto &geo = pixmapGeometries[i];
         if (geo.isNull()) {
             discardReplies(0);
             return QVector<QPixmap>();
         }
         getImageCookies[i] = xcb_get_image_unchecked(c, XCB_IMAGE_FORMAT_Z_PIXMAP, data[i],
                                                      0, 0, geo->width, geo->height, ~0);
     }
     for (int i = 0; i < ShadowElementsCount; ++i) {
         auto *reply = xcb_get_image_reply(c, getImageCookies.at(i), nullptr);
         if (!reply) {
             discardReplies(i + 1);
             return QVector<QPixmap>();
         }
         auto &geo = pixmapGeometries[i];
         QImage image(xcb_get_image_data(reply), geo->width, geo->height, QImage::Format_ARGB32);
         ret << QPixmap::fromImage(image);
         free(reply);
     }
     return ret;
 }
 
 int main(int argc, char **argv)
 {
     qputenv("QT_QPA_PLATFORM", "xcb");
     QApplication app(argc, argv);
     app.setProperty("x11Connection", QVariant::fromValue<void *>(QX11Info::connection()));
 
     QCommandLineParser parser;
     parser.addPositionalArgument(QStringLiteral("windowId"), QStringLiteral("The X11 windowId from which to read the shadow"));
     parser.addHelpOption();
     parser.process(app);
 
     if (parser.positionalArguments().count() != 1) {
         parser.showHelp(1);
     }
 
     bool ok = false;
     const auto shadow = readShadow(parser.positionalArguments().constFirst().toULongLong(&ok, 16));
     if (!ok) {
         qDebug() << "!!! Failed to read window id";
         return 1;
     }
     if (shadow.isEmpty()) {
         qDebug() << "!!!! Read shadow failed";
         return 1;
     }
     const auto pixmaps = getPixmaps(shadow);
     if (pixmaps.isEmpty()) {
         qDebug() << "!!!! Read pixmap failed";
         return 1;
     }
 
     std::unique_ptr<QWidget> widget(new QWidget());
     QFormLayout *layout = new QFormLayout(widget.get());
     for (const auto &pix : pixmaps) {
         QLabel *l = new QLabel(widget.get());
         l->setPixmap(pix);
         layout->addRow(QStringLiteral("%1x%2:").arg(pix.width()).arg(pix.height()), l);
     }
     widget->setLayout(layout);
     widget->show();
     return app.exec();
 }