[ wxwindows-Patches-1537065 ] wxImage: Higher quality scaling/sampling

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Patches item #1537065, was opened at 2006-08-08 23:48
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Category: Common
Group: new feature
Status: Open
Resolution: None
Priority: 5
Submitted By: V0rtex (ev0rtex)
Assigned to: Nobody/Anonymous (nobody)
Summary: wxImage: Higher  quality scaling/sampling

Initial Comment:
This patch implements an optional higher quality method
for upsampling and downsampling images (selectively
using the best method for each) in wxImage's Scale()
method.  Both a box averager and a bicubic algorithm
are used in the process.  As can be seen in the patch,
there are a number of functions added for aiding this
process and I figured that the three blurring functions
were useful enough for uses other than just antialiased
downsampling, therefore they have been added to the
documentation as well.

This came about because due to a need for better
looking images (specifically downsampled ones).  The
results look   much nicer although there is the obvious
drawback of slower upsampling due to the amount of data
processed with the bicubic algorithm.

NOTE: I didn't think that the ResampleBox() and
ResampleBicubic() methods were of much use externally
so I did not add anything to the latex docs for them. 
They are documented in their comments, however, as well
as their purpose noted by their obvious names.

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