Module: Badline::VIC::GraphicsMode

Defined in:

lib/badline/vic/graphics_mode.rb

Defined Under Namespace

Modules: Hires, Multicolor Classes: Bitmap, ExtendedBackgroundText, MulticolorBitmap, MulticolorText, Null, Text

Constant Summary

HIRES_FG =

Foreground masks depend only on the data byte, so each byte maps to a precomputed frozen pattern shared by reference instead of being written out pixel by pixel.

Array.new(256) do |data|
  Array.new(8) { |i| data.anybits?(1 << (7 - i)) }.freeze
end.freeze

PAIR_FG =

The high bit of each 2-bit pair (10/11) is foreground.

Array.new(256) do |data|
  Array.new(8) { |i| (data >> (6 - (i & ~1))).allbits?(0b10) }.freeze
end.freeze

NO_FG =

HIRES_FG[0]