From bf09c7a1493c01a65ee0f110b37a04e653edc08e Mon Sep 17 00:00:00 2001
From: David Edmundson <davidedmundson@kde.org>
Date: Wed, 3 Jan 2018 19:18:42 +0000
Subject: [PATCH] Don't recreate hidden egl surfaces

QWaylandEglWindow deletes surfaces when a window changes from hidden to
visible, presumably as a result of us not having a valid wl_surface
object. By extension it doesn't make sense to create a surface whilst a
window is still hidden.

This fixes a crash where a QQuickWindow hides and then is destroyed. In
QQuickWindow destruction we have to create a valid context in order to
delete any textures/assets owned by the scene graph; as the wl_surface
has gone this causes an error in the EGL libs when we create an EGL
surface.

Task-number: QTBUG-65553
Change-Id: I9b37a86326bf2cd7737c4e839c1aa8c74cf08116
Reviewed-by: Johan Helsing <johan.helsing@qt.io>
---
 .../client/wayland-egl/qwaylandglcontext.cpp       |  2 +-
 tests/auto/client/client/tst_client.cpp            | 37 ++++++++++++++++++++++
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp b/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp
index 2a9e39e..f4dd6f4 100644
--- a/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp
+++ b/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp
@@ -407,7 +407,7 @@ bool QWaylandGLContext::makeCurrent(QPlatformSurface *surface)
         window->createDecoration();
 
     if (eglSurface == EGL_NO_SURFACE) {
-        window->updateSurface(true);
+        window->updateSurface(window->isExposed());
         eglSurface = window->eglSurface();
     }
 
diff --git a/tests/auto/client/client/tst_client.cpp b/tests/auto/client/client/tst_client.cpp
index 3897bd3..aed601d 100644
--- a/tests/auto/client/client/tst_client.cpp
+++ b/tests/auto/client/client/tst_client.cpp
@@ -35,6 +35,8 @@
 #include <QMimeData>
 #include <QPixmap>
 #include <QDrag>
+#include <QWindow>
+#include <QOpenGLWindow>
 
 #include <QtTest/QtTest>
 #include <QtWaylandClient/private/qwaylandintegration_p.h>
@@ -112,6 +114,25 @@ public:
     QPoint mousePressPos;
 };
 
+class TestGlWindow : public QOpenGLWindow
+{
+    Q_OBJECT
+
+public:
+    TestGlWindow();
+
+protected:
+    void paintGL() override;
+};
+
+TestGlWindow::TestGlWindow()
+{}
+
+void TestGlWindow::paintGL()
+{
+    glClear(GL_COLOR_BUFFER_BIT);
+}
+
 class tst_WaylandClient : public QObject
 {
     Q_OBJECT
@@ -149,6 +170,7 @@ private slots:
     void dontCrashOnMultipleCommits();
     void hiddenTransientParent();
     void hiddenPopupParent();
+    void glWindow();
 
 private:
     MockCompositor *compositor;
@@ -409,6 +431,21 @@ void tst_WaylandClient::hiddenPopupParent()
     QTRY_VERIFY(compositor->surface());
 }
 
+void tst_WaylandClient::glWindow()
+{
+    QSKIP("Skipping GL tests, as not supported by all CI systems: See https://bugreports.qt.io/browse/QTBUG-65802");
+
+    QScopedPointer<TestGlWindow> testWindow(new TestGlWindow);
+    testWindow->show();
+    QSharedPointer<MockSurface> surface;
+    QTRY_VERIFY(surface = compositor->surface());
+
+    //confirm we don't crash when we delete an already hidden GL window
+    //QTBUG-65553
+    testWindow->setVisible(false);
+    QTRY_VERIFY(!compositor->surface());
+}
+
 int main(int argc, char **argv)
 {
     setenv("XDG_RUNTIME_DIR", ".", 1);
-- 
2.7.4