Strategies are set forth for performing a scaling operation on image
information using a filter. According to one exemplary implementation,
the strategies involve: computing, based on scaling to be performed, a
number of filter kernels required to implement the filter and a number of
taps required for each filter kernel; pre-computing and storing the
number of filter kernels; and applying the filter kernels to a row or
column of the image information by repeatedly sequencing through the
filter kernels if there are more pixel elements in the row or column than
there are pre-calculated filter kernels. The scaling operation can employ
a Catmull-Rom filter. Further, the scaling operations can be implemented
by a pixel shader by assigning weighting information and delta-shifted
versions of the image information to respective texture units of the
pixel shader.