From 038aa9d8d7effc2170d66b5d12c25d704ebcaa46 Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Fri, 27 Nov 2020 13:59:48 +0000
Subject: [PATCH] wayland: Fix clipped thumbnails of client-side decorated apps

The buffer offset for client-side decorated windows is not 0, this plus
mixing the frame position and the client size may result in clipped
thumbnails of client-side decorated applications, such as gedit, etc.

BUG: 428595


(cherry picked from commit e298caaa7ac8c9d3853929492770ced55faf0818)
---
 plugins/scenes/opengl/scene_opengl.cpp | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/plugins/scenes/opengl/scene_opengl.cpp b/plugins/scenes/opengl/scene_opengl.cpp
index d91d062985..281d24d8fe 100644
--- a/plugins/scenes/opengl/scene_opengl.cpp
+++ b/plugins/scenes/opengl/scene_opengl.cpp
@@ -1551,7 +1551,7 @@ QSharedPointer<GLTexture> OpenGLWindow::windowTexture()
         return QSharedPointer<GLTexture>(new GLTexture(*frame->texture()));
     } else {
         auto effectWindow = window()->effectWindow();
-        QRect geo(pos(), window()->clientSize());
+        const QRect geo = window()->clientGeometry();
         QSharedPointer<GLTexture> texture(new GLTexture(GL_RGBA8, geo.size()));
 
         QScopedPointer<GLRenderTarget> framebuffer(new KWin::GLRenderTarget(*texture));
@@ -1562,14 +1562,10 @@ QSharedPointer<GLTexture> OpenGLWindow::windowTexture()
         GLRenderTarget::setVirtualScreenGeometry(geo);
 
         QMatrix4x4 mvp;
-        mvp.ortho(geo);
+        mvp.ortho(geo.x(), geo.x() + geo.width(), geo.y(), geo.y() + geo.height(), -1, 1);
 
         WindowPaintData data(effectWindow);
         data.setProjectionMatrix(mvp);
-        QSizeF size(geo.size());
-        data.setYScale(-1);
-        data.setXTranslation(bufferOffset().x());
-        data.setYTranslation(geo.height() + bufferOffset().y());
 
         performPaint(Scene::PAINT_WINDOW_TRANSFORMED | Scene::PAINT_WINDOW_LANCZOS, geo, data);
         GLRenderTarget::popRenderTarget();