alongtheblue-sketch took 0.12.0's version 7 output of the SVGs in #2692
and #2830, edited it by hand and opened it in the reference app
(https://github.com/storytold/vectorcraft/pull/2801#issuecomment-6244853548).
Writing the image lines as #2801 does, with the bracketed matrix and
the 60-digit data lines, did not change the result there. With one
line, F, added after %AI5_EndRaster, the reference app opened the image
in its clipping group and the art after it in both files.
The writer now writes F after every %AI5_EndRaster: clipped, grouped
and loose images, flattened images and images in pattern tiles. No path
is open at that point, so the line paints nothing. VectorCraft's reader
opens the files with the same objects as before, and the file's
PostScript prolog draws the same page.
A version 7 .ai wrote each image's matrix as [a b c d tx ty] and its
samples on comment lines of 64 hex digits. The Adobe Illustrator File
Format Specification version 7.0, which the writer follows, writes the
matrix with a space inside each bracket in the XI syntax (section 8.1)
and in all five examples (section 8.4), and every example data line
holds 60 hex digits. #2692 reports that the reference app leaves out an
image inside a clipping group, and all the art after it, in the files
written from the reporter's two SVGs.
The writer now writes [ a b c d tx ty ] and data lines of 60 hex digits
(the last holds the rest), for every image it writes. VectorCraft's
reader and the file's PostScript prolog read both forms. The result was
not checked in the reference app.
The version 7 .ai writer wrote a radial gradient's highlight (Bh) only
when the gradient had a focal point off its center. A centered radial
gradient, such as an SVG radialGradient without fx and fy, was written
Bb, Bg, f, BB with no Bh. Every radial instance in the Adobe Illustrator File
Format Specification version 7.0, which the writer follows, has one,
0 0 0 0 Bh for a centered highlight (sections 3.5.5, 3.5.6 and 9.3).
#2687 reports that the reference app draws such a circle in its outer
color.
The writer now writes Bh in every radial instance, 0 0 0 0 Bh at the
center. A focal point past the radius, which an elliptical gradient
written circular can have, is written on the circle, so its x and y
offsets agree with the fraction 1 written after them (section 3.5.5).
Linear instances are unchanged. The result was not checked in the
reference app.
Saving a version 7 .ai expands raster effects into images and flattens
images with see-through pixels, opacity or a blending mode, and both
draw the art with the renderer. An image the renderer couldn't decode
drew nothing, so it was missing from the result, and the reply carried
no note. A semi-transparent image cut short was removed without one.
The save now compares decode_failures() before and after it writes the
artboards, as Expand Appearance and the raster exports do, and adds
"an image couldn't be decoded and is missing from the picture" to its
warnings once.
Docs: docs/mcp.md (aiVersion "7").
The file had an empty prolog, so a PostScript interpreter stopped at its first operator: it
couldn't be printed, placed or previewed by anything that runs PostScript. The prolog's
procedure set (VectorCraft_Legacy, written from the PostScript Language Reference and the
version 7 specification) now gives every operator the writer emits its meaning: paths and their
painting with separate fill and stroke colours and overprints, the fill rule, compound paths
painted as one path, clipping groups and masks, guides that don't print, layers that are hidden
or don't print marking nothing, and images drawn from the hex samples on the comment lines after
XI. Gradients fill with the colour set before them (the first stop's), and the type and encoding
operators take their operands and mark nothing.
VectorCraft opens a file with that prolog from its program, as before: its page has flat
gradients and no type.
Every file the writer's tests write is now run through import_with(bytes, false) and must draw
what the document it was written from draws: its paths, fills, strokes and images in the same
places and colours, with type left out (type the writer outlines is compared as its glyphs'
outlines), gradients as their first stop, layers that don't print left out and hidden objects
shown when the options write them visible. A new test prints the sample with every layer shown.
The engine's flattened-image test also opens the file as PostScript.
Type is written as version 7 text objects (§15): point type, area type and type on a path, with
fonts by PostScript name re-encoded to Windows-1252, and each run's paint, size, scaling,
tracking, leading, alignment and indents; type 8-bit text can't hold (or all, with outlineText)
is outlines. The format hides only layers, so hidden objects go to a hidden layer above their
own (hiddenObjects "layer", the default), are left out ("omit") or show ("visible"). The .ai
reader reads legacy type (To … TO, TE, %AI3_BeginEncoding) and ignores Ar; the import fuzzer
gets legacy type tokens.
aiVersion 7 saves through the legacy writer, one file per artboard; range picks the artboards
and document.save writes them again. Appearances are expanded first. Transparent images
(see-through pixels, opacity or a blending mode) are flattened with the art under them into
opaque images clipped to where they change it (transparentImages "flatten", the default), or
left out ("omit"); both warn.
dotCooCoo