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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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34
doc/foot.ini.5.scd
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@ -847,34 +847,24 @@ any of these options.
Default: _lanczos3_.
*allow-overflowing-double-width-glyphs*
Boolean. When enabled, double width glyphs with a character width
of 1 are allowed to overflow into the neighbouring cell.
*overflowing-glyphs*
Boolean. When enabled, glyphs wider than their cell(s) are allowed
to render into one additional neighbouring cell.
One use case for this is fonts "icon" characters in the Unicode
private usage area, e.g. Nerd Fonts, or Powerline Fonts. Without
this option, such glyphs will appear "cut off".
One use case for this are fonts with wide italic characters that
"bend" into the next cell. Without this option, such glyphs will
appear "cut off".
Another use case are legacy emoji characters like *WHITE FROWNING
FACE*.
Another use case are fonts with "icon" characters in the Unicode
private usage area, e.g. Nerd Fonts, or Powerline Fonts and legacy
emoji characters like *WHITE FROWNING FACE*.
Note: this feature uses _heuristics_ to determine *which* glyphs
should be allowed to overflow.
See also: *pua-double-width*
Note: might impact performance depending on the font used.
Especially small font sizes can cause many overflowing glyphs
because of subpixel rendering.
Default: _yes_.
*pua-double-width*
Boolean. When enabled, Unicode code points from the private usage
area (PUA) are always considered to be double width, regardless of
the actual glyph width.
Ignored if *allow-overflowing-double-width-glyphs* has been
disabled.
Default: _no_.
*render-timer*
Enables a frame rendering timer, that prints the time it takes to
render each frame, in microseconds, either on-screen, to stderr,