In 2D graphics a shear transform can be coded in a 2D matrix (I think) and turns a rectangle into a parallelogram.
Now what is the thing which widens a rectangle's width at the top and reduces it at the bottom? Does it have a name and does it have a matrix for doing it in one go?
Hope I have been clear!
The shape you're looking for is a trapezoid.
Poking around a bit on stackoverflow, I came upon this thread which seems to answer your question with a "No, not in 2D". http://stackoverflow.com/questions/2484071/how-do-i-compete-the-transformation-matrix-needed-to-transform-a-rectangle-into-a
If this doesn't answer your question, you should be able to find something about it on Google.
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