wallpapers/potd: Pass screen size and devicePixelRatio from QML to BingProvider

The wallpaper knows the size of the screen where it lives, so no need
to use primary screen.

wallpapers/potd/package/contents/ui/main.qml

@@ -5,6 +5,8 @@
  */
 
 import QtQuick 2.5
+import QtQuick.Window 2.15
+
 import org.kde.plasma.core 2.0 as PlasmaCore
 import org.kde.kquickcontrolsaddons 2.0
 
@@ -16,8 +18,16 @@ Rectangle {
     PotdProviderModel {
         id: engine
         identifier: wallpaper.configuration.Provider
-        // Needs to specify category for unsplash provider
-        arguments: identifier === "unsplash" ? [wallpaper.configuration.Category] : []
+        arguments: {
+            if (identifier === "unsplash") {
+                // Needs to specify category for unsplash provider
+                return [wallpaper.configuration.Category];
+            } else if (identifier === "bing") {
+                // Bing supports 1366/1920/UHD resolutions
+                return [Screen.width, Screen.height, Screen.devicePixelRatio];
+            }
+            return [];
+        }
         running: true
     }
 

wallpapers/potd/plugins/bingprovider.cpp

@@ -7,16 +7,17 @@
 #include "bingprovider.h"
 
 #include <QDebug>
-#include <QGuiApplication>
 #include <QJsonArray>
 #include <QJsonDocument>
-#include <QScreen>
 
 #include <KIO/Job>
 #include <KPluginFactory>
 
 BingProvider::BingProvider(QObject *parent, const KPluginMetaData &data, const QVariantList &args)
     : PotdProvider(parent, data, args)
+    , m_screenDPI(args.size() >= 3 ? args[2].toDouble() : 1)
+    , m_screenWidth(args.size() >= 2 ? args[0].toInt() * m_screenDPI : 0)
+    , m_screenHeight(args.size() >= 2 ? args[1].toInt() * m_screenDPI : 0)
 {
     const QUrl url(QStringLiteral("https://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1"));
 
@@ -55,7 +56,7 @@ void BingProvider::pageRequestFinished(KJob *_job)
 
         urlString = QStringLiteral("https://www.bing.com/") + urlString;
 
-        if (const QSize size = qGuiApp->primaryScreen()->size(); size.width() > 1920 || size.height() > 1080) {
+        if (m_screenWidth > 1920 || m_screenHeight > 1080) {
             // Use 4k wallpaper
             urlString += QStringLiteral("_UHD.jpg");
         } else {

wallpapers/potd/plugins/bingprovider.h

@@ -30,6 +30,10 @@ public:
 private:
     void pageRequestFinished(KJob *job);
     void imageRequestFinished(KJob *job);
+
+    double m_screenDPI;
+    int m_screenWidth;
+    int m_screenHeight;
 };
 
 #endif