Autumn Lamonte 4a7e06f657 Support for transparency in images ...

The ECMA48 sixel parser now recognizes transparency (the missing
pixels kind, not alpha blending).

When using the Swing backend, if jexer.Swing.imagesOverText is true
then text glyphs will be rendered underneath image cells.  This is
defaulted to false because of the hideous performance cost at the
moment, especially against sixel animations in terminal windows.

ECMA48 backend is still unaware of transparency.  I would need to
define a font with fallback and render images-over-text to that, which
is slightly more than I want to handle at the moment.  (Though I do
use a similar method for VT100 double-width / double-height inside the
terminal window.)

Jexer PNG images in terminal windows also handle 24-bit +
transparency.  One can use the 'imgls' script in the examples
directory to try this out.

2021-12-21 15:51:12 -06:00

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