From 5696081cf7cd679b785b6bb61f6ed9962565af23 Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Tue, 28 Nov 2023 12:28:00 +0200
Subject: [PATCH] plugins/startupfeedback: Add hidpi support on wayland

---
 .../startupfeedback/startupfeedback.cpp       | 27 ++++++++++++++-----
 src/plugins/startupfeedback/startupfeedback.h |  5 ++--
 2 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/src/plugins/startupfeedback/startupfeedback.cpp b/src/plugins/startupfeedback/startupfeedback.cpp
index 8f1f71a173..c3bb9c8d60 100644
--- a/src/plugins/startupfeedback/startupfeedback.cpp
+++ b/src/plugins/startupfeedback/startupfeedback.cpp
@@ -24,6 +24,7 @@
 #include <KSharedConfig>
 #include <KWindowSystem>
 // KWin
+#include "core/output.h"
 #include "core/rendertarget.h"
 #include "core/renderviewport.h"
 #include "effect/effecthandler.h"
@@ -305,6 +306,12 @@ void StartupFeedbackEffect::start(const Startup &startup)
     if (m_type == NoFeedback || m_splashVisible || effects->isCursorHidden()) {
         return;
     }
+
+    const Output *output = effects->screenAt(effects->cursorPos().toPoint());
+    if (!output) {
+        return;
+    }
+
     if (!m_active) {
         effects->startMousePolling();
     }
@@ -322,8 +329,9 @@ void StartupFeedbackEffect::start(const Startup &startup)
     if (m_type == BouncingFeedback) {
         m_bounceSizesRatio = iconSize / 16.0;
     }
+
     const QPixmap iconPixmap = startup.icon.pixmap(iconSize);
-    prepareTextures(iconPixmap);
+    prepareTextures(iconPixmap, output->scale());
     m_dirtyRect = m_currentGeometry = feedbackRect();
     effects->addRepaint(m_dirtyRect);
 }
@@ -354,13 +362,13 @@ void StartupFeedbackEffect::stop()
     effects->addRepaintFull();
 }
 
-void StartupFeedbackEffect::prepareTextures(const QPixmap &pix)
+void StartupFeedbackEffect::prepareTextures(const QPixmap &pix, qreal devicePixelRatio)
 {
     effects->makeOpenGLContextCurrent();
     switch (m_type) {
     case BouncingFeedback:
         for (int i = 0; i < 5; ++i) {
-            m_bouncingTextures[i] = GLTexture::upload(scalePixmap(pix, BOUNCE_SIZES[i]));
+            m_bouncingTextures[i] = GLTexture::upload(scalePixmap(pix, BOUNCE_SIZES[i], devicePixelRatio));
             if (!m_bouncingTextures[i]) {
                 return;
             }
@@ -385,7 +393,7 @@ void StartupFeedbackEffect::prepareTextures(const QPixmap &pix)
     }
 }
 
-QImage StartupFeedbackEffect::scalePixmap(const QPixmap &pm, const QSize &size) const
+QImage StartupFeedbackEffect::scalePixmap(const QPixmap &pm, const QSize &size, qreal devicePixelRatio) const
 {
     const QSize &adjustedSize = size * m_bounceSizesRatio;
     QImage scaled = pm.toImage().scaled(adjustedSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
@@ -393,7 +401,9 @@ QImage StartupFeedbackEffect::scalePixmap(const QPixmap &pm, const QSize &size)
         scaled.convertTo(QImage::Format_ARGB32);
     }
 
-    QImage result(20 * m_bounceSizesRatio, 20 * m_bounceSizesRatio, QImage::Format_ARGB32);
+    QImage result(feedbackIconSize() * devicePixelRatio, QImage::Format_ARGB32);
+    result.setDevicePixelRatio(devicePixelRatio);
+
     QPainter p(&result);
     p.setCompositionMode(QPainter::CompositionMode_Source);
     p.fillRect(result.rect(), Qt::transparent);
@@ -405,6 +415,11 @@ QImage StartupFeedbackEffect::scalePixmap(const QPixmap &pm, const QSize &size)
     return result;
 }
 
+QSize StartupFeedbackEffect::feedbackIconSize() const
+{
+    return QSize(20, 20) * m_bounceSizesRatio;
+}
+
 QRect StartupFeedbackEffect::feedbackRect() const
 {
     int xDiff;
@@ -436,7 +451,7 @@ QRect StartupFeedbackEffect::feedbackRect() const
     const QPoint cursorPos = effects->cursorPos().toPoint() + QPoint(xDiff, yDiff + yOffset);
     QRect rect;
     if (texture) {
-        rect = QRect(cursorPos, texture->size());
+        rect = QRect(cursorPos, feedbackIconSize());
     }
     return rect;
 }
diff --git a/src/plugins/startupfeedback/startupfeedback.h b/src/plugins/startupfeedback/startupfeedback.h
index c2ee4e8b1d..1a5399c4e7 100644
--- a/src/plugins/startupfeedback/startupfeedback.h
+++ b/src/plugins/startupfeedback/startupfeedback.h
@@ -71,9 +71,10 @@ private:
 
     void start(const Startup &startup);
     void stop();
-    QImage scalePixmap(const QPixmap &pm, const QSize &size) const;
-    void prepareTextures(const QPixmap &pix);
+    QImage scalePixmap(const QPixmap &pm, const QSize &size, qreal devicePixelRatio) const;
+    void prepareTextures(const QPixmap &pix, qreal devicePixelRatio);
     QRect feedbackRect() const;
+    QSize feedbackIconSize() const;
 
     qreal m_bounceSizesRatio;
     KStartupInfo *m_startupInfo;