The Limited palette's median cut ranks cuts by pixel-weighted gain. A
large near-black ground with faint noise therefore took two colors less
than 0.02 apart in Oklab, and the trace drew blotches of one over the
other.
With 9 to 16 colors, a cut whose two sides both have a dark gray mean
(Oklab lightness under 0.30, chroma under 0.03) and lie less than 0.03
apart now has its gain scaled by (distance / 0.03)^2 while the cut is
chosen. The ground keeps one color, and the color it would have taken
goes to another cut. Document Library without swatches follows Limited.
Other color counts, Full Tone and Automatic choose the same cuts as
before.
Art and pattern brushes bent their art along the chords of the flattened
path, with the tangent blended linearly between vertices, and scatter
brushes placed and turned their copies on the same chords. On a smooth
curve the bent art's edges followed the chords, and the curve fitted to
the result turned by up to a few degrees at its smooth anchors.
- On a chord that comes from flattening a curve, the frame now follows
the cubic through both vertices with their tangents, so position and
tangent meet at every vertex. A vertex tangent between two such chords
is the tangent of the circle through the vertex and its neighbors, and
it stays within a few times the flattening tolerance of each chord, so
the frame stays near the curve next to a long chord. A curved chord
whose end tangents turn further than that keeps to the chord.
- Art on a line of the path stays on the line, and a line keeps its own
direction where it meets a curve.
- A calligraphic nib that follows the pen samples between vertices on
the same frame, so its outline keeps its distance from the curve.
Deleting ruler guides and moving or scaling an artboard's guides asked
each layer whether its whole subtree held a matching guide, then asked
every sublayer the same question again on the way down. A layer nested
N deep was scanned N times, so a chain of N layers cost N(N+1)/2 layer
scans.
One read walk now records which children match and which sublayers hold
a match, and the edit visits and copies only those layers. The guides
removed, the count returned, the selection, the order the guides are
changed in and the sharing of untouched layers are the same as before.
The same walk replaces the repeated subtree scans in the other guide
edits in this file:
- tidying the ruler guides of an opened file (guides below art, in
objects, in opacity-mask art, in symbols and patterns)
- saving the guides as a list
- removing an editing layer while keeping its guides
A PDF-compatible .ai saved with Include Editing Data for Other Apps
wrote no text wrap options, so a wrap object opened from the file no
longer wrapped type. An object with only wrap options got no
dictionary at all.
The writer now writes each wrap object's options in its dictionary as
`AI11TextWrapOffset` (`/Real`) and `AI11TextWrapInvert` (`/Bool`, 1 or
0), the entries `text_wrap` in crates/eps/src/import/ai/read/document.rs
reads, beside the object's name, variables and opacity mask.
- The offset is the one in the art's space, so on a large canvas it is
written at 1/10 and read back at its size. An offset that is not
finite is written as the default 6 pt, and one past the -1000 to
1000 pt the reader keeps as the nearer end of that range.
- Art the writer draws for an object (a blend's steps, a symbol
instance written as its art, a brushed stroke's pieces, pattern
tiles, an object's drawn look) is written without the options of the
objects it is made from. The object itself and a symbol's own art
keep theirs.
- A clipping path written as its fills and its strokes has its options
once.
Docs: docs/file-format-parity.md, docs/target-app-parity.md.
Session::replace_document on a tab other than the current one cleared
the bounds of type set in a font named like a composite font and left
that type with estimated bounds until the document came to the front.
- The replacement's type without bounds is measured at once, in the
document's own composite fonts, lent for the measuring. The front
document stays the one whose composite fonts are registered.
- When the document then comes to the front unchanged, its type in its
own composite fonts is not measured again. Type set in a composite
font only another document defines is still measured again, as
missing, and so is type set in a composite font name that another
thread's loan held with a different definition.
When a read document is brought within the canvas, each saved guide was
checked against the removed artboard ids and the removed layer ids with
linear scans, and each guide node against the removed artboard ids, so
the work grew with the number of guides times the number of removed ids.
The ids are now collected into ordered sets, and each guide is checked
in logarithmic time.
Removing what lies beyond the canvas scanned each container's whole
subtree to see whether anything reached beyond, then scanned each child
again while removing, one level down at a time, so a deeply nested
object was measured once for every group around it. Removing guide nodes
probed each layer's subtree the same way before descending into its
sublayers. Both now make one read-only walk that records, by index,
which objects reach beyond (or which guides are removed), and the
removal follows that record. The objects clipped by a clipping path
beyond the canvas are still not measured.
Containers with nothing to remove are still not copied. The objects and
guides that remain, their order, the counts, the retired artboard ids
and the saved selections are unchanged.
Right-to-left type on a path that overflows searched for the start of its
text that fits with a binary search, which assumed that a longer start
never fits once a shorter one does not. A letter tracked to a negative
advance breaks that: with steps of 6, 6, -3 and 6 points in a 10 point
span, the first three letters fit while the first two do not, and the
search showed only the first letter.
- Without hanging punctuation, and with no spacing or on a path of one
straight segment, every start is measured in O(n log n): each glyph
keeps its place in the whole text's visual order, except the trailing
whitespace and controls that UAX #9 rule L1 sets to the paragraph's
level.
- With hanging punctuation, or spacing on a curve, when a letter has a
negative advance, a start is a candidate only when its glyphs, in its
own visual order and each at the least step it can take, reach no
farther than the path's length. This lower bound holds with negative
advances.
- At most 32 candidates are arranged from the longest. When none of
them fits, a binary search over the rest shows a start that fits,
which is not always the longest.
- With hanging punctuation, or spacing on a curve, text with no negative
advance keeps the binary search.
Right-aligned and centered type on a curve with Spacing was placed using
the width its glyphs have at the start bracket, while the steps were
measured where the line was placed, so a line that fits could end past
the end bracket and lose glyphs. It is now placed using the width of the
steps it has where it is placed.
BFlat