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render: Allow cells to bleed into their neighbor

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This patch adds a `confined` flag to each cell to track if the last
rendered glyph bled into it's right neighbor.  To keep things simple,
bleeding into any other neighbor cell than the immediate right one is
not allowed.  This should cover most use cases.

Before rendering a row we now do a prepass and mark all cells unclean
that are affected by a bleeding neighbor.  If there are consecutive
bleeding cells, the whole group must be re-rendered even if only a
single cell has changed.

The patch also deprecates both old overflowing glyph options
*allow-overflowing-double-width-glyphs* and *pua-double-width* in favor
of a single new one named *overflowing-glyphs*.
This commit is contained in:
Timur Celik 2021-06-15 11:45:27 +02:00
parent 9211ee694c
commit 91801ae55d
6 changed files with 71 additions and 75 deletions
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11
CHANGELOG.md
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@ -33,6 +33,9 @@
* `locked-title=no|yes` to `foot.ini`
(https://codeberg.org/dnkl/foot/issues/386).
* `tweak.overflowing-glyphs` option, which can be enabled to fix rendering
issues with glyphs of any width that appear cut-off
(https://codeberg.org/dnkl/foot/issues/592).
### Changed
@ -45,6 +48,12 @@
### Deprecated
### Removed
* The `tweak.allow-overflowing-double-width-glyphs` and
`tweak.pua-double-width` options (which have been superseded by
`tweak.overflowing-glyphs`).
### Fixed
* Glyph offset not being taken into account when applying
@ -69,6 +78,8 @@
### Security
### Contributors
* [clktmr](https://codeberg.org/clktmr)
## 1.8.1