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/*
* LXImage-Qt - a simple and fast image viewer
* Copyright (C) 2013 PCMan <pcman.tw@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include "screenshotdialog.h"
#include "screenshotselectarea.h"
#include <QTimer>
#include <QPixmap>
#include <QImage>
#include <QPainter>
#include "application.h"
#include <QDesktopWidget>
#include <QScreen>
#include <QX11Info>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xfixes.h>
using namespace LxImage;
ScreenshotDialog::ScreenshotDialog(QWidget* parent, Qt::WindowFlags f): QDialog(parent, f) {
ui.setupUi(this);
Application* app = static_cast<Application*>(qApp);
app->addWindow();
int event_base, error_base;
hasXfixes_ = XFixesQueryExtension(QX11Info::display(), &event_base, &error_base) ? true : false;
if(!hasXfixes_)
ui.includeCursor->hide();
}
ScreenshotDialog::~ScreenshotDialog() {
Application* app = static_cast<Application*>(qApp);
app->removeWindow();
}
void ScreenshotDialog::done(int r) {
if(r == QDialog::Accepted) {
hide();
QDialog::done(r);
XSync(QX11Info::display(), 0); // is this useful?
int delay = ui.delay->value();
if(delay == 0) {
// NOTE:
// Well, we need to give X and the window manager some time to
// really hide our own dialog from the screen.
// Nobody knows how long it will take, and there is no reliable
// way to ensure that. Let's wait for 400 ms here for it.
delay = 400;
}
else
delay *= 1000;
// the dialog object will be deleted in doScreenshot().
QTimer::singleShot(delay, this, SLOT(doScreenshot()));
}
else {
deleteLater();
}
}
QRect ScreenshotDialog::windowFrame(WId wid) {
QRect result;
XWindowAttributes wa;
if(XGetWindowAttributes(QX11Info::display(), wid, &wa)) {
Window child;
int x, y;
// translate to root coordinate
XTranslateCoordinates(QX11Info::display(), wid, wa.root, 0, 0, &x, &y, &child);
//qDebug("%d, %d, %d, %d", x, y, wa.width, wa.height);
result.setRect(x, y, wa.width, wa.height);
// get the frame widths added by the window manager
Atom atom = XInternAtom(QX11Info::display(), "_NET_FRAME_EXTENTS", false);
unsigned long type, resultLen, rest;
int format;
unsigned char* data = nullptr;
if(XGetWindowProperty(QX11Info::display(), wid, atom, 0, G_MAXLONG, false,
XA_CARDINAL, &type, &format, &resultLen, &rest, &data) == Success) {
}
if(data) { // left, right, top, bottom
long* offsets = reinterpret_cast<long*>(data);
result.setLeft(result.left() - offsets[0]);
result.setRight(result.right() + offsets[1]);
result.setTop(result.top() - offsets[2]);
result.setBottom(result.bottom() + offsets[3]);
XFree(data);
}
}
return result;
}
WId ScreenshotDialog::activeWindowId() {
WId root = WId(QX11Info::appRootWindow());
Atom atom = XInternAtom(QX11Info::display(), "_NET_ACTIVE_WINDOW", false);
unsigned long type, resultLen, rest;
int format;
WId result = 0;
unsigned char* data = nullptr;
if(XGetWindowProperty(QX11Info::display(), root, atom, 0, 1, false,
XA_WINDOW, &type, &format, &resultLen, &rest, &data) == Success) {
result = *reinterpret_cast<long*>(data);
XFree(data);
}
return result;
}
void ScreenshotDialog::doScreenshot() {
WId wid = 0;
int x = 0, y = 0, width = -1, height = -1;
wid = QApplication::desktop()->winId(); // get desktop window
if(ui.currentWindow->isChecked()) {
WId activeWid = activeWindowId();
if(activeWid) {
if(ui.includeFrame->isChecked()) {
QRect rect = windowFrame(activeWid);
x = rect.x();
y = rect.y();
width = rect.width();
height = rect.height();
}
else
wid = activeWid;
}
}
QImage image;
QScreen *screen = QGuiApplication::primaryScreen();
if(screen) {
QPixmap pixmap = screen->grabWindow(wid, x, y, width, height);
image = pixmap.toImage();
if(hasXfixes_ && ui.includeCursor->isChecked()) {
// capture the cursor if needed
XFixesCursorImage* cursor = XFixesGetCursorImage(QX11Info::display());
if(cursor) {
if(cursor->pixels) { // pixles should be an ARGB array
QImage cursorImage;
if(sizeof(long) == 4) {
// FIXME: will we encounter byte-order problems here?
cursorImage = QImage((uchar*)cursor->pixels, cursor->width, cursor->height, QImage::Format_ARGB32);
}
else { // XFixes returns long integers which is not 32 bit on 64 bit systems.
long len = cursor->width * cursor->height;
quint32* buf = new quint32[len];
for(long i = 0; i < len; ++i)
buf[i] = (quint32)cursor->pixels[i];
cursorImage = QImage((uchar*)buf, cursor->width, cursor->height, QImage::Format_ARGB32, [](void* b) { delete[] (quint32*)b; }, buf);
}
// paint the cursor on the current image
QPainter painter(&image);
painter.drawImage(cursor->x - cursor->xhot, cursor->y - cursor->yhot, cursorImage);
}
XFree(cursor);
}
}
}
if(ui.screenArea->isChecked() && !image.isNull()) {
ScreenshotSelectArea selectArea(image);
if(QDialog::Accepted == selectArea.exec()) {
image = image.copy(selectArea.selectedArea());
}
}
Application* app = static_cast<Application*>(qApp);
MainWindow* window = app->createWindow();
if(!image.isNull())
window->pasteImage(image);
window->show();
deleteLater(); // destroy ourself
}
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