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Hamza NaveedandHamza
75af6f589a
* PDF interpret: a glyph shown in a clipping mode clips even with no outline
A glyph shown in a clipping render mode (`4 Tr` to `7 Tr`) adds its outline to
the clipping path, and that clip applies to everything painted after `ET` until
the enclosing `Q`. When the glyphs shown have no outline -- a space, say -- the
clip they contribute is empty, and an empty clip admits nothing.
`interpret_window` applied a clip only once a glyph had contributed an outline,
so such a text object applied *no* clip and what followed painted unmasked.
A text object that shows no glyph at all is a different case and is left alone:
the clipping path is unchanged there, as readers leave it, and a glyph whose
outline is unavailable (Type 3) leaves the real clip unknown, so both stay
unclipped. pdf.js draws the same line in `endText`: it builds the clip from the
glyphs shown, empty outlines and all, and applies none when none were shown.
Measured on a page filled red behind the text object, Preview (CoreGraphics)
and Firefox (pdf.js) agreeing on the case this changes:
a space shown in 7 Tr before: the fill paints after: nothing paints
no glyph shown in 7 Tr unchanged: the fill paints
Companion to storytold/pdfcraft#3451.
The first push of this branch also carried 803 build-artifact files from
`crates/pdf/read-only-contract/target/`, which `.gitignore` did not cover: its
`/target` is anchored to the repository root, so a sub-crate's own build
directory is not ignored. Recommitted without them, and `target/` added so the
next one cannot slip in either (#185 review).
* pdf: test visible glyphs in a clipping mode, and what each clip leaves on the page
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Co-authored-by: Hamza <mail.hamzanaveed@gmail.com>