--- qtdeclarative-opensource-src-5.4.2/src/quick/items/qquickshadereffectsource.cpp	2015-06-30 07:30:51.938794778 +0200

+++ qtdeclarative-opensource-src-5.4.2/src/quick/items/qquickshadereffectsource.cpp.orig	2015-06-30 07:29:47.019163937 +0200

@@ -632,8 +632,12 @@ 

     const QSize minTextureSize = d->sceneGraphContext()->minimumFBOSize();

     // Keep power-of-two by doubling the size.

+    if (textureSize.width() < 1)

+       textureSize.rwidth() = 1;

     while (textureSize.width() < minTextureSize.width())

         textureSize.rwidth() *= 2;

+    if (textureSize.height() < 1)

+       textureSize.rheight() = 1;

     while (textureSize.height() < minTextureSize.height())

         textureSize.rheight() *= 2;