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Ell authored
A subclass of GimpTransformTool, to be used as a base class for transform tools that calculate their matrix based on 4 pairs of input/output points, and that display the transform matrix as their GUI (this includes the unified, perspective, and handle transform tools; the next commit ports them over to GimpGenericTransformTool). When the resulting matrix of the input/output mapping sends any of the output points to, or past, infinity, GimpGenericTransformTool sets GimpTransformTool::transform_valid to FALSE, and displays an appropriate message in the tool GUI, instead of showing the matrix.
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