As outlined in #2199, there may be ways to trigger text layout code
through forward-focus before embedded fonts are registered. To fix this,
this patch replaces the init_code vector, which had the SetFocusItem
code before the font registration, with three explicit vectors for focus
setup code, code from init callbacks, and initial focus, and defines the
order in one central place in the copmiler (iter()).
Fixes#2199
This uses the approach discussed in Mattermost: The compiler understands
a SLINT_DEFAULT_FONT environment variable that can point to a path,
which overrides the fallback font that would otherwise come from the
system (and differ between test systems).
Implement some very rudimentary font fallback handling and add some the
glyphs the puzzle needs.
The font fallback handling deserves to go into a module shared between
GL backend and the compiler.
For the character selection we should scan the text elements for
literals just like we do for the font size.
Make sure to embed whatever we pick as default font, but also register
any custom imported fonts.
This fixes the plaster font not showing up in the slide puzzle on the
stm32.
Continue to support specififying logical font sizes in the compile step
via SLINT_FONT_SIZES, but additionally look for Text/TextInput/Window elements
and extract any constant font sizes
found.
This makes it work out of the box with the printer demo.
The code was mixing logical and physical sizes, causing glyphs being
doubly scaled down. Instead, this patch introduces:
* Physical* and Logical* euclid length/size/rect aliases
* some extraction traits for getting the scalars in rects/sizes as lengths (until euclid has them
built-in)
* wrapper traits/types for safely extracting the physical font metrics the
compiler generates (i16)
* Fix a bug in the text height calculation where we failed to take the
descent into account
Enable with `SLINT_EMBED_GLYPHS=1` and select sizes like
`SLINT_FONT_SIZES=12,16`
This change just puts the data structures in place, rasterizes a fixed
subset, embeds that into the rust generated code and calls a backend
function for registering the font that is unimplemented.
