Vignette.qml

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// SPDX-FileCopyrightText: 2018 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
// SPDX-License-Identifier: MPL-2.0
 
import QtQuick
 
Item {
    id: root
    Accessible.ignored: true
 
    property variant source
 
    property alias radius: effect.radius
 
    property alias brightness: effect.brightness
 
    ShaderEffect {
        id: effect
        anchors.fill: parent
 
        property variant source: ShaderEffectSource {
            sourceItem: root.source
            sourceRect: Qt.rect(0, 0, 0, 0)
            hideSource: false
            smooth: true
            visible: false
        }
 
        property real radius: 16
        property real brightness: 0.1
 
        fragmentShader: "
            varying highp vec2 qt_TexCoord0;
            uniform highp float qt_Opacity;
            uniform highp float radius;
            uniform highp float brightness;
            uniform lowp sampler2D source;
 
            void main() {
                highp vec2 uv = qt_TexCoord0.xy;
                highp vec2 coord = qt_TexCoord0 - 0.5;
                lowp vec4 orig = texture2D(source, uv);
 
                highp float vignette = 1.0 - dot(coord, coord);
 
                lowp vec3 col = orig.rgb * clamp(pow(vignette, radius) + brightness, 0.0, 1.0);
 
                gl_FragColor = vec4(col, 1.0);
            }"
    }
}