kopia lustrzana https://github.com/peterhinch/micropython-micro-gui
82 wiersze
2.8 KiB
Python
82 wiersze
2.8 KiB
Python
# bitmap.py Provides the BMG (bitmapped graphics) class
|
|
# Released under the MIT License (MIT). See LICENSE.
|
|
# Copyright (c) 2022 Peter Hinch
|
|
|
|
# Graphics are files created by Linux bitmap utility.
|
|
# Widget writes data direct to the FrameBuffer.
|
|
# There is no scaling: declared size of the widget must exactly
|
|
# match the size of the bitmap.
|
|
|
|
from gui.core.ugui import Widget
|
|
from gui.core.colors import *
|
|
from gui.core.ugui import ssd
|
|
|
|
|
|
class BitMap(Widget):
|
|
|
|
def __init__(self, writer, row, col, height, width, *, fgcolor=None, bgcolor=None, bdcolor=RED):
|
|
super().__init__(writer, row, col, height, width, fgcolor, bgcolor, bdcolor)
|
|
|
|
def show(self):
|
|
if not super().show(True): # Draw or erase border
|
|
return
|
|
if self._value is None:
|
|
return
|
|
with open(self._value, "r") as f:
|
|
g = self._gen_bytes(f)
|
|
bit = 1
|
|
wrap = False
|
|
for row in range(self.height):
|
|
if not wrap:
|
|
byte = next(g) # Each row starts on a new byte
|
|
bit = 1
|
|
for col in range(self.width):
|
|
c = self.fgcolor if byte & bit else self.bgcolor
|
|
ssd.pixel(self.col + col, self.row + row, c)
|
|
wrap = (bit := bit << 1) == 0x100
|
|
if wrap:
|
|
byte = next(g)
|
|
bit = 1
|
|
|
|
def _gen_bytes(self, f): # Yield data bytes from file stream
|
|
f.readline()
|
|
f.readline() # Advance file pointer to data start
|
|
s = f.readline()
|
|
if not s.startswith("static"):
|
|
raise ValueError("Bad file format.")
|
|
while s := f.readline():
|
|
if (lb := s.find("}")) != -1:
|
|
s = s[:lb] # Strip trailing };
|
|
p = s.strip().split(',')
|
|
for x in p:
|
|
if x:
|
|
yield int(x, 16)
|
|
|
|
# Get height/width dimension from file stream.
|
|
def _get_dim(self, f, name):
|
|
s = f.readline()
|
|
elements = s.split(" ")
|
|
if not elements[1].endswith(name):
|
|
raise ValueError("Bad file format.")
|
|
return int(elements[2])
|
|
|
|
def _validate(self, fn):
|
|
if not isinstance(fn, str):
|
|
raise ValueError("Value must be a filename.")
|
|
with open(fn, "r") as f:
|
|
wd = self._get_dim(f, "width")
|
|
ht = self._get_dim(f, "height")
|
|
if not (wd == self.width and ht == self.height):
|
|
raise ValueError(f"Object dimensions {ht}x{wd} do not match widget {self.height}x{self.width}")
|
|
|
|
def value(self, fn):
|
|
self._validate(fn) # Throws on failure
|
|
super().value(fn)
|
|
|
|
def color(self, fgcolor=None, bgcolor=None):
|
|
if fgcolor is not None:
|
|
self.fgcolor = fgcolor
|
|
if bgcolor is not None:
|
|
self.bgcolor = bgcolor
|
|
self.draw = True
|