mirror of
https://github.com/KrisKennaway/ii-pix.git
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119 lines
4.2 KiB
Python
119 lines
4.2 KiB
Python
import numpy as np
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import palette as palette_py
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class Screen:
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X_RES = None
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Y_RES = None
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X_PIXEL_WIDTH = None
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def __init__(self, palette: palette_py.Palette):
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self.main = np.zeros(8192, dtype=np.uint8)
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self.aux = np.zeros(8192, dtype=np.uint8)
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self.palette = palette
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@staticmethod
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def y_to_base_addr(y: int) -> int:
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"""Maps y coordinate to screen memory base address."""
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a = y // 64
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d = y - 64 * a
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b = d // 8
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c = d - 8 * b
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return 1024 * c + 128 * b + 40 * a
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def _image_to_bitmap(self, image: np.ndarray) -> np.ndarray:
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raise NotImplementedError
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def pack(self, image: np.ndarray):
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bitmap = self._image_to_bitmap(image)
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# The DHGR display encodes 7 pixels across interleaved 4-byte sequences
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# of AUX and MAIN memory, as follows:
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# PBBBAAAA PDDCCCCB PFEEEEDD PGGGGFFF
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# Aux N Main N Aux N+1 Main N+1 (N even)
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main_col = np.zeros(
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(self.Y_RES, self.X_RES * self.X_PIXEL_WIDTH // 14), dtype=np.uint8)
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aux_col = np.zeros(
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(self.Y_RES, self.X_RES * self.X_PIXEL_WIDTH // 14), dtype=np.uint8)
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for byte_offset in range(80):
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column = np.zeros(self.Y_RES, dtype=np.uint8)
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for bit in range(7):
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column |= (bitmap[:, 7 * byte_offset + bit].astype(
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np.uint8) << bit)
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if byte_offset % 2 == 0:
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aux_col[:, byte_offset // 2] = column
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else:
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main_col[:, (byte_offset - 1) // 2] = column
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for y in range(self.Y_RES):
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addr = self.y_to_base_addr(y)
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self.aux[addr:addr + 40] = aux_col[y, :]
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self.main[addr:addr + 40] = main_col[y, :]
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return bitmap
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def bitmap_to_image_rgb(self, bitmap: np.ndarray) -> np.ndarray:
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image_rgb = np.empty((192, 560, 3), dtype=np.uint8)
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for y in range(self.Y_RES):
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pixel = [False, False, False, False]
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for x in range(560):
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pixel[x % 4] = bitmap[y, x]
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dots = self.palette.DOTS_TO_4BIT[tuple(pixel)]
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image_rgb[y, x, :] = self.palette.RGB[dots]
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return image_rgb
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def pixel_palette_options(self, last_pixel_4bit, x: int):
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raise NotImplementedError
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class DHGR140Screen(Screen):
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"""DHGR screen ignoring colour fringing, i.e. treating as 140x192x16."""
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X_RES = 140
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Y_RES = 192
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X_PIXEL_WIDTH = 4
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def _image_to_bitmap(self, image_4bit: np.ndarray) -> np.ndarray:
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bitmap = np.zeros(
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(self.Y_RES, self.X_RES * self.X_PIXEL_WIDTH), dtype=np.bool)
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for y in range(self.Y_RES):
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for x in range(self.X_RES):
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pixel = image_4bit[y, x]
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dots = self.palette.DOTS[pixel]
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bitmap[y, x * self.X_PIXEL_WIDTH:(
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(x + 1) * self.X_PIXEL_WIDTH)] = dots
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return bitmap
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def pixel_palette_options(self, last_pixel_4bit, x: int):
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return (
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np.array(list(self.palette.RGB.keys()), dtype=np.uint8),
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np.array(list(self.palette.RGB.values()), dtype=np.uint8))
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class DHGR560Screen(Screen):
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"""DHGR screen including colour fringing."""
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X_RES = 560
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Y_RES = 192
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X_PIXEL_WIDTH = 1
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def _image_to_bitmap(self, image_4bit: np.ndarray) -> np.ndarray:
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bitmap = np.zeros((self.Y_RES, self.X_RES), dtype=np.bool)
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for y in range(self.Y_RES):
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for x in range(self.X_RES):
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pixel = image_4bit[y, x]
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dots = self.palette.DOTS[pixel]
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phase = x % 4
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bitmap[y, x] = dots[phase]
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return bitmap
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def pixel_palette_options(self, last_pixel_4bit, x: int):
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last_dots = self.palette.DOTS[last_pixel_4bit]
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other_dots = list(last_dots)
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other_dots[x % 4] = not other_dots[x % 4]
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other_dots = tuple(other_dots)
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other_pixel_4bit = self.palette.DOTS_TO_4BIT[other_dots]
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return (
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np.array([last_pixel_4bit, other_pixel_4bit], dtype=np.uint8),
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np.array([self.palette.RGB[last_pixel_4bit],
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self.palette.RGB[other_pixel_4bit]], dtype=np.uint8))
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