Grouping for flattening joined every pair of objects whose 1 pt reach
boxes touched, transitively, so a row or grid of opaque objects next to
one see-through object became one group and was flattened with it.
Now a group holds each see-through object and every object its reach
touches. An object without transparency joins only where its reach
touches a member and it lies above that member but below the group's
topmost object, whose place the group takes, so the stacking order
stays the same. In files without transparency with Clip Complex Regions
on, art under a group within one image pixel of a member joins it too,
with the pixel size taken from the image's actual resolution. Objects in
an overlap set that includes one inside a clip group or clipping layer
keep the previous grouping.
The 1 pt antialiasing margin now goes around a group's art once instead
of once per nested group (a stroked path's plain art is a group, so it
had 2 pt).
On 3,000 stroked rectangles, 60 with a drop shadow, the Flattener Preview
counts 180 affected objects where it counted 3,000, and Flatten
Transparency with the Medium preset makes 240 flat regions and 2 images
where it made one image of the whole grid.
The flattener limited an image's resolution only by its total pixels, while
the renderer draws at most 32,768 pixels a side. A long area, such as a narrow
see-through gradient strip down a 2 m banner at 1200 ppi, came back cut off
at that length and was placed as if whole, so the rest of the strip was lost
in Flatten Transparency and in PDF/X-1a, PDF/X-3 and PDF 1.3 exports. The
resolution is now also limited by the longest side, as raster effects are.
With an unclipped raster/vector balance between 0 and 100, a group that
splits into more than 10^(balance/20) regions is rasterized whole and
none of its regions are used. The region build now stops at the first
region past that limit (pathops `regions_within`) instead of building
every region and then discarding them. Groups at or under the limit,
and every group with Clip Complex Regions on, still build every region.
Flatten Transparency, the flattened document and EPS export come out
the same as with every region built, for groups under the limit, at it,
just over it and far over it.
dotCooCoo