Smoothed icons with high dpi support in Qt app

[daljit97]

I have enabled high dpi support in my Qt application using QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling); but now my images don't look crisp, instead they look "smoothed" out. For example below there is a picture of some button that are meant to be using high dpi images. When I disable the high dpi support and manually scale the ui, using the same images the icons are crisp and clear.

I have tried to set Qt::AA_UseHighDpiPixmaps with no success.
Here is a sample code:

import QtQuick 2.11
import QtQuick.Window 2.11
import QtQuick.Controls 2.2

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    ToolButton{
        anchors.centerIn: parent
        icon.source: "qrc:/ic_star_white_48dp.png"
    }
}

The icon I am using is from Google material design icons and it is made for a high dpi screen device (resolution is 192x192). Enabling high dpi the icon in the toolbutton appears smoothed out. If I disable the high dpi support and set the height and width of the icon (icon.height and icon.width) to 640/160 * 48 (640 is the dpi of my device) the icon is crisp and clear. However, if I enable high dpi and set the height and width to 48, the icon is not crisp.

[SGaist]

Hi,

Did you already saw the related part of QIcon’s documentation ?