From f073c773da6801096ecab9454cba3ecd47d69bf6 Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Fri, 21 Feb 2020 12:16:38 +0200
Subject: [PATCH] [server] Introduce SurfaceInterface::boundingRect()

Summary:
The new method provides a convenient way for determining the rectangle
that bounds the given surface and all of its sub-surfaces. This can be
very handy when determining the effective window geometry.

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: apol, kde-frameworks-devel

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D27828
---
 src/wayland/surface_interface.cpp | 13 +++++++++++++
 src/wayland/surface_interface.h   |  8 ++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/wayland/surface_interface.cpp b/src/wayland/surface_interface.cpp
index 0690b19749..baa7c85441 100644
--- a/src/wayland/surface_interface.cpp
+++ b/src/wayland/surface_interface.cpp
@@ -772,6 +772,19 @@ QSize SurfaceInterface::size() const
     return QSize();
 }
 
+QRect SurfaceInterface::boundingRect() const
+{
+    QRect rect(QPoint(0, 0), size());
+
+    const QList<QPointer<SubSurfaceInterface>> subSurfaces = childSubSurfaces();
+    for (const SubSurfaceInterface *subSurface : subSurfaces) {
+        const SurfaceInterface *childSurface = subSurface->surface();
+        rect |= childSurface->boundingRect().translated(subSurface->position());
+    }
+
+    return rect;
+}
+
 QPointer< ShadowInterface > SurfaceInterface::shadow() const
 {
     Q_D();
diff --git a/src/wayland/surface_interface.h b/src/wayland/surface_interface.h
index 632bbc8a5c..fb61978fda 100644
--- a/src/wayland/surface_interface.h
+++ b/src/wayland/surface_interface.h
@@ -112,6 +112,14 @@ public:
      * @since 5.3
      **/
     QSize size() const;
+    /**
+     * Returns the rectangle that bounds this surface and all of its sub-surfaces.
+     *
+     * QPoint(0, 0) corresponds to the upper left corner of this surface.
+     *
+     * @since 5.69
+     */
+    QRect boundingRect() const;
 
     /**
      * @returns The SubSurface for this Surface in case there is one.