The three envelope ink tests set "Type" in the default family and
unwrapped ink_bounds(). Without bundled fonts, craft-fonts or system
fonts (vectorcraft-effects' tests on a bare Linux host), no face draws
and the effects test panicked at the unwrap.
Each test now adds the Heighttest Sans face built from the bundled
Source Sans 3 (test-fonts feature, now also on vectorcraft-effects'
dev-dependency), sets the text in it, and computes the expected box
from the layout's glyph outlines. It checks that envelope_ink gives
that box as well as the before and after registration boxes, so a
change to the registered measure fails the test.
An envelope mapped type from its laid-out box: ascent to descent for
point type, the frame for area type. The distorted glyphs then filled
less of the envelope than other art does, with room above the capitals
and below the baseline.
The envelope now maps type from the bounds of its glyph outlines,
underlines and strikethroughs when the type is on its own, in groups
and layers, or used as a clipping path. Inline graphics count by their
boxes. Rotated type and type in perspective map from their outlines as
they are drawn. Make with Mesh,
Make with Top Object and Reset with Mesh without Maintain Shape use
those bounds. Type that draws nothing keeps its laid-out box, and so
does type inside any other object, such as a blend, a repeat or a
symbol instance. Shrink Text to Fit type is measured as it is laid out
on the page.
vectorcraft-text's envelope_ink measures the type, and
register_envelope_ink registers it with the document crate. The engine
session, Renderer::new, live evaluation in vectorcraft-effects and the
.ai reader register it. The document crate keeps the measured boxes per
thread, by object and by a hash of the content, and measures again when
the type, the fonts, the hyphenation exceptions or the transform's
scale or rotation change.
This is VectorCraft's own rule. Envelopes of type made in VectorCraft
and in saved files map from the glyph outline bounds instead of the
type's laid-out box, so they redraw differently.
dotCooCoo