ii-vision/transcoder/palette.py
kris f3d03a1b87 Update comments and fix some bugs
make_edit_distance
- use MASKED_DOTS since it does not have a simple relationship to the
  HEADER_BITS/BODY_BITS for HGR
- try disabling transposition distances for Damerau-Levenshtein, this
  may give better quality

screen
- introduce separate notion of MASKED_DOTS which is the number of
  (coloured) pixels we can extract from MASKED_BITS.  For HGR this is
  not the same.
- fix bug in _fix_array_neighbours that was not fixing headers for HGR
- don't cache everything in byte_pair_differences, it's effectively
  unbounded.  Using 1M for LRU size seems to work just as well in
  practise, without leaking memory.
- fix bug in _diff_weights when comparing content, we want to evaluate
  the effect of storing content byte in each offset separately, not
  cumulatively.
- add a consistency check function (not currently wired up) to assert
  that headers/footers are in sync across columns
- HGR should have 16 body bits, this was causing headers not to
  propagate correctly to/from neighbouring column
- add test case for this bug

video
- Use 8 random bits consistently, using 16 in some places may have
  introduced bias
- ignore palette bit when comparing 0x00 and 0x7f in sanity check
2019-07-11 23:40:00 +01:00

85 lines
2.3 KiB
Python

"""RGB palette values for rendering NominalColour pixels."""
import enum
from typing import Dict, Type
import colormath.color_objects
from colours import HGRColours
# Type annotation
RGB = colormath.color_objects.sRGBColor
def rgb(r, g, b):
return RGB(r, g, b, is_upscaled=True)
class Palette(enum.Enum):
"""BMP2DHR palette numbers."""
UNKNOWN = -1
IIGS = 0
NTSC = 5
class BasePalette:
ID = Palette.UNKNOWN # type: Palette
# Palette RGB map
RGB = {} # type: Dict[HGRColours: RGB]
class NTSCPalette(BasePalette):
ID = Palette.NTSC
# Palette RGB values taken from BMP2DHGR's default NTSC palette
RGB = {
HGRColours.BLACK: rgb(0, 0, 0),
HGRColours.MAGENTA: rgb(148, 12, 125),
HGRColours.BROWN: rgb(99, 77, 0),
HGRColours.ORANGE: rgb(249, 86, 29),
HGRColours.DARK_GREEN: rgb(51, 111, 0),
HGRColours.GREY1: rgb(126, 126, 126),
HGRColours.GREEN: rgb(67, 200, 0),
HGRColours.YELLOW: rgb(221, 206, 23),
HGRColours.DARK_BLUE: rgb(32, 54, 212),
HGRColours.VIOLET: rgb(188, 55, 255),
HGRColours.GREY2: rgb(126, 126, 126),
HGRColours.PINK: rgb(255, 129, 236),
HGRColours.MED_BLUE: rgb(7, 168, 225),
HGRColours.LIGHT_BLUE: rgb(158, 172, 255),
HGRColours.AQUA: rgb(93, 248, 133),
HGRColours.WHITE: rgb(255, 255, 255)
}
class IIGSPalette(BasePalette):
ID = Palette.IIGS
# Palette RGB values taken from BMP2DHGR's KEGS32 palette
RGB = {
HGRColours.BLACK: rgb(0, 0, 0),
HGRColours.MAGENTA: rgb(221, 0, 51),
HGRColours.BROWN: rgb(136, 85, 34),
HGRColours.ORANGE: rgb(255, 102, 0),
HGRColours.DARK_GREEN: rgb(0, 119, 0),
HGRColours.GREY1: rgb(85, 85, 85),
HGRColours.GREEN: rgb(0, 221, 0),
HGRColours.YELLOW: rgb(255, 255, 0),
HGRColours.DARK_BLUE: rgb(0, 0, 153),
HGRColours.VIOLET: rgb(221, 0, 221),
HGRColours.GREY2: rgb(170, 170, 170),
HGRColours.PINK: rgb(255, 153, 136),
HGRColours.MED_BLUE: rgb(34, 34, 255),
HGRColours.LIGHT_BLUE: rgb(102, 170, 255),
HGRColours.AQUA: rgb(0, 255, 153),
HGRColours.WHITE: rgb(255, 255, 255)
}
PALETTES = {
Palette.IIGS: IIGSPalette,
Palette.NTSC: NTSCPalette
} # type: Dict[Palette, Type[BasePalette]]