1 files changed, 98 insertions, 0 deletions
diff --git a/kde-plasma/kwin/files/kwin-5.27.6-fix-effect-to-only-apply-behind-window.patch b/kde-plasma/kwin/files/kwin-5.27.6-fix-effect-to-only-apply-behind-window.patch
new file mode 100644
index 000000000000..b2c8c026316b
--- /dev/null
+++ b/kde-plasma/kwin/files/kwin-5.27.6-fix-effect-to-only-apply-behind-window.patch
@@ -0,0 +1,98 @@
+From 69151896615ec272d78860b2ef42e61657f435f1 Mon Sep 17 00:00:00 2001
+From: Xaver Hugl <xaver.hugl@gmail.com>
+Date: Thu, 22 Jun 2023 11:35:27 +0200
+Subject: [PATCH] plugins/backgroundcontrast,blur: ensure the effect is only
+ applied behind the window
+
+When a window is translated and/or scaled, the effect must be strictly behind the
+window and never beyond it, as that is very noticeable.
+
+BUG: 469625
+(cherry picked from commit cd94cdaf3a04227073c3f99833139a712d195d3a)
+---
+ src/effects/backgroundcontrast/contrast.cpp | 22 +++++++++++++--------
+ src/effects/blur/blur.cpp                   | 19 ++++++++++++------
+ 2 files changed, 27 insertions(+), 14 deletions(-)
+
+diff --git a/src/effects/backgroundcontrast/contrast.cpp b/src/effects/backgroundcontrast/contrast.cpp
+index 8921a481e3f..66dffd99a94 100644
+--- a/src/effects/backgroundcontrast/contrast.cpp
++++ b/src/effects/backgroundcontrast/contrast.cpp
+@@ -382,25 +382,31 @@ void ContrastEffect::drawWindow(EffectWindow *w, int mask, const QRegion &region
+         const QRect screen = effects->renderTargetRect();
+         QRegion shape = region & contrastRegion(w).translated(w->pos().toPoint()) & screen;
+ 
+-        // let's do the evil parts - someone wants to blur behind a transformed window
++        // let's do the evil parts - someone wants to contrast behind a transformed window
+         const bool translated = data.xTranslation() || data.yTranslation();
+         const bool scaled = data.xScale() != 1 || data.yScale() != 1;
+         if (scaled) {
+             QPoint pt = shape.boundingRect().topLeft();
+             QRegion scaledShape;
+             for (QRect r : shape) {
+-                r.moveTo(pt.x() + (r.x() - pt.x()) * data.xScale() + data.xTranslation(),
+-                         pt.y() + (r.y() - pt.y()) * data.yScale() + data.yTranslation());
+-                r.setWidth(std::ceil(r.width() * data.xScale()));
+-                r.setHeight(std::ceil(r.height() * data.yScale()));
+-                scaledShape |= r;
++                const QPointF topLeft(pt.x() + (r.x() - pt.x()) * data.xScale() + data.xTranslation(),
++                                      pt.y() + (r.y() - pt.y()) * data.yScale() + data.yTranslation());
++                const QPoint bottomRight(std::floor(topLeft.x() + r.width() * data.xScale()) - 1,
++                                         std::floor(topLeft.y() + r.height() * data.yScale()) - 1);
++                scaledShape |= QRect(QPoint(std::floor(topLeft.x()), std::floor(topLeft.y())), bottomRight);
+             }
+             shape = scaledShape & region;
+ 
+             // Only translated, not scaled
+         } else if (translated) {
+-            shape = shape.translated(data.xTranslation(), data.yTranslation());
+-            shape = shape & region;
++            QRegion translated;
++            for (QRect r : shape) {
++                const QRectF t = QRectF(r).translated(data.xTranslation(), data.yTranslation());
++                const QPoint topLeft(std::ceil(t.x()), std::ceil(t.y()));
++                const QPoint bottomRight(std::floor(t.x() + t.width() - 1), std::floor(t.y() + t.height() - 1));
++                translated |= QRect(topLeft, bottomRight);
++            }
++            shape = translated & region;
+         }
+ 
+         if (!shape.isEmpty()) {
+diff --git a/src/effects/blur/blur.cpp b/src/effects/blur/blur.cpp
+index ec08e6cc968..1b6d9997c98 100644
+--- a/src/effects/blur/blur.cpp
++++ b/src/effects/blur/blur.cpp
+@@ -625,17 +625,24 @@ void BlurEffect::drawWindow(EffectWindow *w, int mask, const QRegion &region, Wi
+             QPoint pt = shape.boundingRect().topLeft();
+             QRegion scaledShape;
+             for (QRect r : shape) {
+-                r.moveTo(pt.x() + (r.x() - pt.x()) * data.xScale() + data.xTranslation(),
+-                         pt.y() + (r.y() - pt.y()) * data.yScale() + data.yTranslation());
+-                r.setWidth(std::ceil(r.width() * data.xScale()));
+-                r.setHeight(std::ceil(r.height() * data.yScale()));
+-                scaledShape |= r;
++                const QPointF topLeft(pt.x() + (r.x() - pt.x()) * data.xScale() + data.xTranslation(),
++                                      pt.y() + (r.y() - pt.y()) * data.yScale() + data.yTranslation());
++                const QPoint bottomRight(std::floor(topLeft.x() + r.width() * data.xScale()) - 1,
++                                         std::floor(topLeft.y() + r.height() * data.yScale()) - 1);
++                scaledShape |= QRect(QPoint(std::floor(topLeft.x()), std::floor(topLeft.y())), bottomRight);
+             }
+             shape = scaledShape;
+ 
+             // Only translated, not scaled
+         } else if (translated) {
+-            shape = shape.translated(data.xTranslation(), data.yTranslation());
++            QRegion translated;
++            for (QRect r : shape) {
++                const QRectF t = QRectF(r).translated(data.xTranslation(), data.yTranslation());
++                const QPoint topLeft(std::ceil(t.x()), std::ceil(t.y()));
++                const QPoint bottomRight(std::floor(t.x() + t.width() - 1), std::floor(t.y() + t.height() - 1));
++                translated |= QRect(topLeft, bottomRight);
++            }
++            shape = translated;
+         }
+ 
+         EffectWindow *modal = w->transientFor();
+-- 
+GitLab
+