ZoomBlur QML Type

The following example shows how to apply the effect.

import QtQuick
import Qt5Compat.GraphicalEffects

Item {
    width: 300
    height: 300

    Image {
        id: butterfly
        source: "images/bug.jpg"
        sourceSize: Qt.size(parent.width, parent.height)
        smooth: true
        visible: false
    }

    ZoomBlur {
        anchors.fill: butterfly
        source: butterfly
        samples: 24
        length: 48
    }
}

This property allows the effect output pixels to be cached in order to improve the rendering performance.

Every time the source or effect properties are changed, the pixels in the cache must be updated. Memory consumption is increased, because an extra buffer of memory is required for storing the effect output.

It is recommended to disable the cache when the source or the effect properties are animated.

By default, the property is set to false.

These properties define an offset in pixels for the blur direction center point.

The values range from -inf to inf. By default these properties are set to 0.

Output examples with different horizontalOffset values
horizontalOffset: 100.0	horizontalOffset: 0.0	horizontalOffset: -100.0
samples: 24	samples: 24	samples: 24
length: 32	length: 32	length: 32
verticalOffset: 0	verticalOffset: 0	verticalOffset: 0

This property defines the maximum perceived amount of movement for each pixel. The amount is smaller near the center and reaches the specified value at the edges.

The quality of the blur depends on samples property. If length value is large, more samples are needed to keep the visual quality at high level.

The value ranges from 0.0 to inf. By default the property is set to 0.0 (no blur).

Output examples with different length values
length: 0.0	length: 32.0	length: 48.0
samples: 24	samples: 24	samples: 24
horizontalOffset: 0	horizontalOffset: 0	horizontalOffset: 0
verticalOffset: 0	verticalOffset: 0	verticalOffset: 0

This property defines how many samples are taken per pixel when blur calculation is done. Larger value produces better quality, but is slower to render.

This property is not intended to be animated. Changing this property may cause the underlying OpenGL shaders to be recompiled.

Allowed values are between 0 and inf (practical maximum depends on GPU). By default the property is set to 0 (no samples).

This property defines the source item that is going to be blurred.

This property defines the blur behavior near the edges of the item, where the pixel blurring is affected by the pixels outside the source edges.

If the property is set to true, the pixels outside the source are interpreted to be transparent, which is similar to OpenGL clamp-to-border extension. The blur is expanded slightly outside the effect item area.

If the property is set to false, the pixels outside the source are interpreted to contain the same color as the pixels at the edge of the item, which is similar to OpenGL clamp-to-edge behavior. The blur does not expand outside the effect item area.

By default, the property is set to false.

These properties define an offset in pixels for the blur direction center point.

The values range from -inf to inf. By default these properties are set to 0.

Output examples with different horizontalOffset values
horizontalOffset: 100.0	horizontalOffset: 0.0	horizontalOffset: -100.0
samples: 24	samples: 24	samples: 24
length: 32	length: 32	length: 32
verticalOffset: 0	verticalOffset: 0	verticalOffset: 0