public ImageEffectInterface::transformDimensions(array &$dimensions, $uri)
Determines the dimensions of the styled image.
Parameters
array &$dimensions: Dimensions to be modified - an array with the following keys:
width: the width in pixels, or NULL if unknown
height: the height in pixels, or NULL if unknown
When either of the dimensions are NULL, the corresponding HTML attribute will be omitted when an image style using this image effect is used.
string $uri: Original image file