kwin/tests/x11shadowreader.cpp

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/*
2020-08-02 22:22:19 +00:00
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
*/
2022-01-13 13:54:03 +00:00
#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;
}
QScopedPointer<QWidget> widget(new QWidget());
QFormLayout *layout = new QFormLayout(widget.data());
for (const auto &pix : pixmaps) {
QLabel *l = new QLabel(widget.data());
l->setPixmap(pix);
layout->addRow(QStringLiteral("%1x%2:").arg(pix.width()).arg(pix.height()), l);
}
widget->setLayout(layout);
widget->show();
return app.exec();
}