From 42cff94f722d08a8c40a818cdc835aa1dff880bf Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Thu, 23 Feb 2023 23:31:00 +0200
Subject: [PATCH] effects/magnifier: Fix rendering on multi screen setups

The projection matrix is constructed incorrectly, use the one provided
by the scene instead.
---
 src/effects/magnifier/magnifier.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/effects/magnifier/magnifier.cpp b/src/effects/magnifier/magnifier.cpp
index f92ad06fb5..e04f1f79df 100644
--- a/src/effects/magnifier/magnifier.cpp
+++ b/src/effects/magnifier/magnifier.cpp
@@ -126,9 +126,7 @@ void MagnifierEffect::paintScreen(int mask, const QRegion &region, ScreenPaintDa
             // paint magnifier
             m_texture->bind();
             auto s = ShaderManager::instance()->pushShader(ShaderTrait::MapTexture);
-            QMatrix4x4 mvp;
-            const QSize size = effects->virtualScreenSize();
-            mvp.ortho(0, size.width() * scale, size.height() * scale, 0, 0, 65535);
+            QMatrix4x4 mvp = data.projectionMatrix();
             mvp.translate(area.x() * scale, area.y() * scale);
             s->setUniform(GLShader::ModelViewProjectionMatrix, mvp);
             m_texture->render(area.size(), scale);