From 589b0d4bc81232768b54c8c11bd0a44a72352d7d Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 7 May 2020 15:52:09 +0200
Subject: Reintroduce X background generation

---
 src/loginform.cpp |  3 +++
 src/main.cpp      | 23 +++++++++++++++++------
 src/mainwindow.h  |  2 ++
 3 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/src/loginform.cpp b/src/loginform.cpp
index a17401d..a52aa3d 100644
--- a/src/loginform.cpp
+++ b/src/loginform.cpp
@@ -30,6 +30,8 @@
 #include <QX11Info>
 #include <iostream>
 
+void createSimpleBackground();
+
 LoginForm::LoginForm(QWidget *parent) :
     QWidget(parent), 
     ui(new Ui::LoginForm),
@@ -258,6 +260,7 @@ void LoginForm::onAuthenticationComplete()
     	std::cerr << "Auth complete, start session" << std::endl;
     	showMessage(tr("Starting session..."), false);
         if (Global::startSession()) {
+            createSimpleBackground();
         	cancelLoginTimer.stop();
         } else {
         	showMessage(tr("Cannot open session"), true);
diff --git a/src/main.cpp b/src/main.cpp
index 17d07bc..50816ec 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -37,7 +37,7 @@ static QMap<int, MainWindow*> currentWindows;
 
 static QTimer setupDelay;
 
-static void createSimpleBackground();
+void createSimpleBackground();
 
 static void watch(const QScreen *scrn);
 
@@ -124,12 +124,23 @@ static void watch(const QScreen *scrn)
     });
 }
 
-static void createSimpleBackground()
+void createSimpleBackground()
 {
-    QImage img = Global::getConfigGradient();
-    if (img.isNull())
-        return;
-    img = img.scaled(QApplication::desktop()->size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+    QImage img;
+    if (currentWindows.isEmpty()) {
+        img = Global::getConfigGradient();
+        if (img.isNull()) {
+            img = QImage(QApplication::desktop()->size(), QImage::Format::Format_RGB32);
+        } else {
+            img = img.scaled(QApplication::desktop()->size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+        }
+    } else {
+        img = QImage(QApplication::desktop()->size(), QImage::Format::Format_RGB32);
+        QPainter p(&img);
+        for (auto *w : currentWindows) {
+            p.drawImage(w->geometry(), w->background(), QRect(QPoint(0, 0), w->geometry().size()));
+        }
+    }
     AddPixmapToBackground(img.constBits(), img.width(), img.height(),
                           24, img.bytesPerLine(), img.byteCount());
 }
diff --git a/src/mainwindow.h b/src/mainwindow.h
index fc0249b..f6b1072 100644
--- a/src/mainwindow.h
+++ b/src/mainwindow.h
@@ -40,6 +40,8 @@ public:
 
     LoginForm* stealLoginForm() { LoginForm *p = m_LoginForm; m_LoginForm = nullptr; return p; }
 
+    const QImage& background() { return m_background; }
+
 protected:
     virtual void paintEvent(QPaintEvent *event) override;
 
-- 
cgit v1.2.3-55-g7522