Lanczos Class Reference

Properties
real	antiRingingStrength
real	resolution
real	sinc
var	source
size	sourceSize
size	targetSize
real	windowSinc

Detailed Description

A ShaderEffect that makes use of the Lanczos resampling method for scaling textures.

Lanczos resampling tries to preserve detail when scaling down images and thus looks less blurry compared to a simple linear interpolation.

This effect implements a single-pass Lanczos resampling filter using two lobes. Everything is done in the shader, with some defaults set for parameters. These defaults were designed to provide a good visual result when scaling down window thumbnails.

Definition at line 18 of file Lanczos.qml.

Property Documentation

antiRingingStrength

real Lanczos::antiRingingStrength

read

The amount of anti-ringing to apply.

Defaults to 0.65

Definition at line 51 of file Lanczos.qml.

resolution

real Lanczos::resolution

read

The resolution of the Lanczos effect.

Larger values mean reduced (more pixelated) results. Defaults to 0.98 to achieve good results.

Definition at line 58 of file Lanczos.qml.

sinc

real Lanczos::sinc

read

Lanczos Sinc function factor.

Defaults to 1.0

Definition at line 45 of file Lanczos.qml.

source

var Lanczos::source

read

The source texture.

Can be any QQuickTextureProvider.

Definition at line 23 of file Lanczos.qml.

sourceSize

size Lanczos::sourceSize

read

The size of the source texture.

Used to perform aspect ratio correction.

Definition at line 27 of file Lanczos.qml.

targetSize

size Lanczos::targetSize

read

The target size of the Lanczos effect.

Defaults to the width and height of this effect.

Definition at line 33 of file Lanczos.qml.

windowSinc

real Lanczos::windowSinc

read

Lanczos window Sinc function factor.

Defaults to 0.4

Definition at line 39 of file Lanczos.qml.

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The documentation for this class was generated from the following file:

• Lanczos.qml