From 1f7975e2715f955c059251089277612fc74f9459 Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Fri, 17 Mar 2023 17:16:08 +0200
Subject: [PATCH] effects/screenshot: Provide screenshot scale information

---
 .../screenshot/org.kde.KWin.ScreenShot2.xml   | 21 +++++++++++++++++++
 .../screenshot/screenshotdbusinterface2.cpp   |  1 +
 2 files changed, 22 insertions(+)

diff --git a/src/effects/screenshot/org.kde.KWin.ScreenShot2.xml b/src/effects/screenshot/org.kde.KWin.ScreenShot2.xml
index 1c7011c453..65911c65a3 100644
--- a/src/effects/screenshot/org.kde.KWin.ScreenShot2.xml
+++ b/src/effects/screenshot/org.kde.KWin.ScreenShot2.xml
@@ -55,6 +55,9 @@
                             Available only if the image type is "raw"
             * "windowId" (s): The window id of the captured window. Available
                               since version 4.
+            * "scale" (d): The ratio between the native size and the logical
+                           size of the contents, corresponds to QImage::devicePixelRatio().
+                           Available since version 4.
         -->
         <method name="CaptureWindow">
             <arg name="handle" type="s" direction="in" />
@@ -100,6 +103,9 @@
                             Available only if the image type is "raw"
             * "windowId" (s): The window id of the captured window. Available
                               since version 4.
+            * "scale" (d): The ratio between the native size and the logical
+                           size of the contents, corresponds to QImage::devicePixelRatio().
+                           Available since version 4.
         -->
         <method name="CaptureActiveWindow">
             <annotation name="org.qtproject.QtDBus.QtTypeName.In0" value="QVariantMap" />
@@ -142,6 +148,9 @@
                             image type is "raw"
             * "format" (u): The image format, as defined in QImage::Format.
                             Available only if the image type is "raw"
+            * "scale" (d): The ratio between the native size and the logical
+                           size of the contents, corresponds to QImage::devicePixelRatio().
+                           Available since version 4.
         -->
         <method name="CaptureArea">
             <arg name="x" type="i" direction="in" />
@@ -187,6 +196,9 @@
                             Available only if the image type is "raw"
             * "screen" (s): The name of the captured screen, same as QScreen::name().
                             Available since version 4
+            * "scale" (d): The ratio between the native size and the logical
+                           size of the contents, corresponds to QImage::devicePixelRatio().
+                           Available since version 4.
         -->
         <method name="CaptureScreen">
             <arg name="name" type="s" direction="in" />
@@ -230,6 +242,9 @@
                             Available only if the image type is "raw"
             * "screen" (s): The name of the captured screen, same as QScreen::name().
                             Available since version 4
+            * "scale" (d): The ratio between the native size and the logical
+                           size of the contents, corresponds to QImage::devicePixelRatio().
+                           Available since version 4.
         -->
         <method name="CaptureActiveScreen">
             <annotation name="org.qtproject.QtDBus.QtTypeName.In0" value="QVariantMap" />
@@ -268,6 +283,9 @@
                             image type is "raw"
             * "format" (u): The image format, as defined in QImage::Format.
                             Available only if the image type is "raw"
+            * "scale" (d): The ratio between the native size and the logical
+                           size of the contents, corresponds to QImage::devicePixelRatio().
+                           Available since version 4.
 
             The following results get returned when taking a window screenshot:
 
@@ -319,6 +337,9 @@
                             image type is "raw"
             * "format" (u): The image format, as defined in QImage::Format.
                             Available only if the image type is "raw"
+            * "scale" (d): The ratio between the native size and the logical
+                           size of the contents, corresponds to QImage::devicePixelRatio().
+                           Available since version 4.
         -->
         <method name="CaptureWorkspace">
             <annotation name="org.qtproject.QtDBus.QtTypeName.In0" value="QVariantMap" />
diff --git a/src/effects/screenshot/screenshotdbusinterface2.cpp b/src/effects/screenshot/screenshotdbusinterface2.cpp
index dbc40ba843..3c43f49b7d 100644
--- a/src/effects/screenshot/screenshotdbusinterface2.cpp
+++ b/src/effects/screenshot/screenshotdbusinterface2.cpp
@@ -284,6 +284,7 @@ void ScreenShotSinkPipe2::flush(const QImage &image, const QVariantMap &attribut
     results.insert(QStringLiteral("width"), quint32(image.width()));
     results.insert(QStringLiteral("height"), quint32(image.height()));
     results.insert(QStringLiteral("stride"), quint32(image.bytesPerLine()));
+    results.insert(QStringLiteral("scale"), double(image.devicePixelRatio()));
     QDBusConnection::sessionBus().send(m_replyMessage.createReply(results));
 
     QtConcurrent::run([fileDescriptor = std::move(m_fileDescriptor), image]() mutable {