ImageMaskEffect.qml Example File

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 import QtQuick 1.0
 import Qt.labs.shaders 1.0

 ShaderEffectItem {
     id: effect
     property variant image: 0
     property variant mask: 0

     fragmentShader:
         "
         varying highp vec2 qt_TexCoord0;
         uniform sampler2D image;
         uniform sampler2D mask;
         void main(void)
         {
             gl_FragColor = texture2D(image, qt_TexCoord0.st) * (texture2D(mask, qt_TexCoord0.st).a);
         }
         "
 }