Rasterises Drafter.Widget.Digits.Bitmap glyphs into terminal cells.
Three packings put multiple pixels in one cell: :braille (2×4), :quadrant
(2×2), and :half (1×2). The chart pixel packer supplies the cell
characters. See the large text guide for how the packings
compare.
Examples
iex> Drafter.Widget.Digits.Raster.cell_pixels(:braille)
{2, 4}
iex> Drafter.Widget.Digits.Raster.shrink(:quadrant)
{1, 2}
iex> font = Drafter.Widget.Digits.Raster.font(:braille)
iex> {font.width, font.height}
{4, 4}Summary
Functions
Pixels a cell holds, as {across, down}, for a packing.
Rasterise every bitmap into a font map for Drafter.Widget.Digits.Font.
Rasterise one set of lit pixels into rows strings of columns cells.
Divisors applied to the bitmap before rasterising, as {x, y}.
Types
Functions
@spec cell_pixels(packing()) :: {pos_integer(), pos_integer()}
Pixels a cell holds, as {across, down}, for a packing.
@spec font(packing()) :: %{height: pos_integer(), width: pos_integer(), glyphs: map()}
Rasterise every bitmap into a font map for Drafter.Widget.Digits.Font.
Returns %{height: rows, width: columns, glyphs: %{character => [row, ...]}}.
@spec glyph(packing(), MapSet.t(), pos_integer(), pos_integer()) :: [String.t()]
Rasterise one set of lit pixels into rows strings of columns cells.
@spec shrink(packing()) :: {pos_integer(), pos_integer()}
Divisors applied to the bitmap before rasterising, as {x, y}.
:braille reads the bitmap at full resolution. The coarser packings halve the
rows; a shrunk pixel is lit when any pixel it covers was lit.