Apple-2-SW/ii-vision
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Add type annotations

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kris 2019-06-14 22:03:37 +01:00
parent 33aa4d46c4
commit f07cabafb7
1 changed files with 14 additions and 4 deletions
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18
transcoder/screen.py
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@ -2,9 +2,13 @@
import functools import functools
import pickle import pickle
from typing import Union
import numpy as np import numpy as np
# Type annotation for cases where we may process either an int or a numpy array.
IntOrArray = Union[int, np.ndarray]
def y_to_base_addr(y: int, page: int = 0) -> int: def y_to_base_addr(y: int, page: int = 0) -> int:
"""Maps y coordinate to base address on given screen page""" """Maps y coordinate to base address on given screen page"""
@ -147,7 +151,7 @@ class DHGRBitmap:
self.packed = np.empty(shape=(32, 128), dtype=np.uint32) self.packed = np.empty(shape=(32, 128), dtype=np.uint32)
self._pack() self._pack()
def _pack(self): def _pack(self) -> None:
"""Interleave and pack aux and main memory into 28-bit uint32 array""" """Interleave and pack aux and main memory into 28-bit uint32 array"""
# Palette bit is unused for DHGR so mask it out # Palette bit is unused for DHGR so mask it out
@ -180,7 +184,10 @@ class DHGRBitmap:
return 1 return 1
@staticmethod @staticmethod
def masked_update(byte_offset: int, old_value, new_value: int): def masked_update(
byte_offset: int,
old_value: IntOrArray,
new_value: int) -> IntOrArray:
# Mask out 7-bit value where update will go # Mask out 7-bit value where update will go
masked_value = old_value & ~(0x7f << (7 * byte_offset)) masked_value = old_value & ~(0x7f << (7 * byte_offset))
@ -188,7 +195,7 @@ class DHGRBitmap:
return masked_value ^ update return masked_value ^ update
def apply(self, page: int, offset: int, is_aux: bool, value: int): def apply(self, page: int, offset: int, is_aux: bool, value: int) -> None:
"""Update packed representation of changing main/aux memory.""" """Update packed representation of changing main/aux memory."""
byte_offset = self.interleaved_byte_offset(offset, is_aux) byte_offset = self.interleaved_byte_offset(offset, is_aux)
@ -197,7 +204,10 @@ class DHGRBitmap:
self.packed[page, packed_offset] = self.masked_update( self.packed[page, packed_offset] = self.masked_update(
byte_offset, self.packed[page, packed_offset], value) byte_offset, self.packed[page, packed_offset], value)
def mask_and_shift_data(self, data, byte_offset): def mask_and_shift_data(
self,
data: IntOrArray,
byte_offset: int) -> IntOrArray:
"""Masks and shifts data into the 8 or 12-bit range.""" """Masks and shifts data into the 8 or 12-bit range."""
return (data & self.BYTE_MASK32[byte_offset]) >> ( return (data & self.BYTE_MASK32[byte_offset]) >> (
self.BYTE_SHIFTS[byte_offset]) self.BYTE_SHIFTS[byte_offset])