diff options
Diffstat (limited to 'wasp/draw565.py')
| -rw-r--r-- | wasp/draw565.py | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/wasp/draw565.py b/wasp/draw565.py index 111b2dc..72cda5b 100644 --- a/wasp/draw565.py +++ b/wasp/draw565.py @@ -10,6 +10,12 @@ import fonts.sans24 import math import micropython +from micropython import const + +R = const(0b11111_000000_00000) +G = const(0b00000_111111_00000) +B = const(0b00000_000000_11111) + @micropython.viper def _bitblit(bitbuf, pixels, bgfg: int, count: int): mv = ptr16(bitbuf) @@ -454,3 +460,48 @@ class Draw565(object): y1 = y - int(ydelta * r1) self.line(x0, y0, x1, y1, width, color) + + def lighten(self, color, step=1): + """Get a lighter shade from the same palette. + + The approach is somewhat unsophisticated. It is essentially just a + saturating add for each of the RGB fields. + + :param color: Shade to lighten + :returns: New colour + """ + r = (color & R) + (step << 11) + if r > R: + r = R + + g = (color & G) + (step << 6) + if g > G: + g = G + + b = (color & B) + step + if b > B: + b = B + + return (r | g | b) + + def darken(self, color, step=1): + """Get a darker shade from the same palette. + + The approach is somewhat unsophisticated. It is essentially just a + desaturating subtract for each of the RGB fields. + + :param color: Shade to darken + :returns: New colour + """ + rm = color & R + rs = step << 11 + r = rm - rs if rm > rs else 0 + + gm = color & G + gs = step << 6 + g = gm - gs if gm > gs else 0 + + bm = color & B + b = bm - step if bm > step else 0 + + return (r | g | b) |