[cairo] Drawing diagonal lines with antialiasing off
spitzak at d2.com
Wed Sep 28 11:44:59 PDT 2005
I think there is some misunderstanding. IN NO WAY am I proposing any
kind of compatability with X11!!
Telling the users to offset by .5 will result in all images being
filtered and put fuzzy edges on rectangles. I think it unlikely users
will realize they must draw either the lines or the shapes+images at .5
boundaries, instead it is likely that they will turn off antialiasing
(one of the reasons I really did not like adding the ability to disable
antialiasing is that amateur programmers will see that as a solution to
all their drawing problems). The result is that Cairo output will look
crappy compared to other api's such as Quartz and probably Longhorn.
Using linewidth of 0 for hairlines is well established by PostScript,
OpenGL, PDF, and many other graphics API's.
Jason Dorje Short wrote:
> Xlib has a fixed definition of how a line is drawn, which is based on
> integer coordinates (I've read this definition before but now I can't
> find it). Cairo has a different definition that uses floating-point
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