[PATCH weston 4/8] protocol: crop & scale RFC v3
spitzak at gmail.com
Wed Dec 4 00:07:53 PST 2013
On 12/03/2013 11:13 PM, Pekka Paalanen wrote:
> Ookay, so far it is just me vs. Daniel on the wl_fixed_t issue. Any
> other opinions for/against changing wl_fixed_t to just int?
The source rectangle has to be fractional so that a particular scale can
Otherwise the scale will change in annoying small irregular ways if the
output rectangle is changed in size (and treated as a window into a
larger scaled image), since the source would have to be rounded to the
nearest integer. It will also make it impossible to register two
pictures of different sizes (such as when video playback quality is
I *think* rounding to the nearest 1/256 of a pixel may be ok, but would
prefer that this be a fixed xy translate (in output pixels, not input
pixels), and two fractions giving the scale in each direction.
Any hardware that can crop to a rectangle will support fractional source
rectangles. This is because I could choose a larger source and
destination and then a crop equal to my real destination to achieve the
equivalent of any fractional source rectangle.
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