[cairo] Question about scale-source-surface-paint test

[Carl Worth]

On Sun, 12 Feb 2006 13:53:14 +0100, Emmanuel Pacaud wrote:
> 
> Shouldn't edges of image output of this test program be sharp, even
> without a call to cairo_pattern_set_filter ?
> 

Could be. We have known bugs in the filter sampling location for
CAIRO_FILTER_NEAREST, (see test/filter-nearest-offset.c). So I
wouldn't be too surprised to see similar things in the case of
CAIRO_FILTER_BILINEAR, (which is what you are using).

In the test you refer to I was targeting only the behavior of the
scaling itself. A separate test that targets the filtering behavior
might be useful. It will require some careful thinking about how the
bilinear filter should be specified, (we don't have a written
specification of that now, nor I am doing that careful thinking at the
moment).

-Carl
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