108 lines
2.9 KiB
Python
108 lines
2.9 KiB
Python
import fonts.sans24
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import micropython
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@micropython.viper
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def _bitblit(bitbuf, pixels, bgfg: int, count: int):
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mv = ptr8(bitbuf)
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px = ptr8(pixels)
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bghi = (bgfg >> 24) & 0xff
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bglo = (bgfg >> 16) & 0xff
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fghi = (bgfg >> 8) & 0xff
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fglo = (bgfg ) & 0xff
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bitselect = 0x80
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pxp = 0
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mvp = 0
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for bit in range(count):
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# Draw the pixel
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active = px[pxp] & bitselect
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mv[mvp] = fghi if active else bghi
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mvp += 1
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mv[mvp] = fglo if active else bglo
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mvp += 1
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# Advance to the next bit
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bitselect >>= 1
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if not bitselect:
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bitselect = 0x80
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pxp += 1
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def _bounding_box(s, font):
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w = 0
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for ch in s:
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(_, h, wc) = font.get_ch(ch)
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w += wc + 1
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return (w, h)
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def _draw_glyph(display, glyph, x, y, bgfg):
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(px, h, w) = glyph
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buf = memoryview(display.linebuffer)[0:2*(w+1)]
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bytes_per_row = (w + 7) // 8
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for row in range(h):
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_bitblit(buf, px[row*bytes_per_row:], bgfg, w)
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buf[2*w] = 0
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buf[2*w + 1] = 0
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display.rawblit(buf, x, y+row, w+1, 1)
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class Draw565(object):
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"""Drawing library for RGB565 displays.
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A full framebufer is not required although the library will
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'borrow' a line buffer from the underlying display driver.
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"""
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def __init__(self, display):
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"""Initialise the library.
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Defaults to white-on-black for monochrome drawing operations
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and 24 pt Sans Serif text.
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"""
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self._display = display
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self.set_color(0xffff)
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self.set_font(fonts.sans24)
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def set_color(self, color, bg=0):
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"""Set the foreground (color) and background (bg) color.
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The supplied color will be used for all monochrome drawing operations.
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If no background color is provided then the background will be set
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to black.
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"""
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self._bgfg = (bg << 16) + color
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def set_font(self, font):
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"""Set the font used for rendering text."""
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self._font = font
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def string(self, s, x, y, width=None):
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"""Draw a string at the supplied position.
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If no width is provided then the text will be left justified,
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otherwise the text will be centered within the provided width and,
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importantly, the remaining width will be filled with the background
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color (to ensure that if we update one string with a narrower one
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there is no need to "undraw" it)
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"""
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display = self._display
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bgfg = self._bgfg
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font = self._font
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if width:
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(w, h) = _bounding_box(s, font)
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leftpad = (width - w) // 2
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rightpad = width - w - leftpad
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display.fill(0, x, y, leftpad, h)
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x += leftpad
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for ch in s:
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glyph = font.get_ch(ch)
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_draw_glyph(display, glyph, x, y, bgfg)
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x += glyph[2] + 1
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if width:
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display.fill(0, x, y, rightpad, h)
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