Honey
66464291e1
Navidrome now-playing, clock, and weather for a Waveshare epd4in0e panel, with a local web UI and install/uninstall scripts for the Pi.
80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
"""Shared PIL rendering helpers: font loading and text layout.
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The panel driver dithers whatever RGB image we hand it down to its 6-color
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palette (see epd4in0e.getbuffer, which quantizes with Floyd-Steinberg
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dithering by default) -- so screens can draw with normal anti-aliased RGB
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text and full-color cover art without worrying about the palette themselves.
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"""
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from pathlib import Path
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from PIL import ImageFont
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FONTS_DIR = Path(__file__).resolve().parent.parent / "fonts"
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_font_cache: dict[tuple[str, int], ImageFont.FreeTypeFont] = {}
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def load_font(size: int, bold: bool = False) -> ImageFont.FreeTypeFont:
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key = ("bold" if bold else "regular", size)
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if key not in _font_cache:
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filename = "DejaVuSans-Bold.ttf" if bold else "DejaVuSans.ttf"
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_font_cache[key] = ImageFont.truetype(str(FONTS_DIR / filename), size)
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return _font_cache[key]
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def text_width(draw, text: str, font: ImageFont.FreeTypeFont) -> int:
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left, _, right, _ = draw.textbbox((0, 0), text, font=font)
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return right - left
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def truncate_to_width(draw, text: str, font: ImageFont.FreeTypeFont, max_width: int) -> str:
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"""Single-line ellipsis truncation, mirroring the CSS text-overflow: ellipsis look."""
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if text_width(draw, text, font) <= max_width:
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return text
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ellipsis = "…"
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lo, hi = 0, len(text)
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while lo < hi:
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mid = (lo + hi + 1) // 2
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candidate = text[:mid].rstrip() + ellipsis
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if text_width(draw, candidate, font) <= max_width:
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lo = mid
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else:
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hi = mid - 1
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return text[:lo].rstrip() + ellipsis if lo else ellipsis
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def wrap_to_lines(draw, text: str, font: ImageFont.FreeTypeFont, max_width: int, max_lines: int) -> list[str]:
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"""Word-wrap up to `max_lines`, ellipsis-truncating the last line if it still
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overflows -- mirrors the CSS -webkit-line-clamp behavior used in the old design."""
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words = text.split()
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if not words:
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return []
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lines: list[str] = []
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current = words[0]
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next_index = 1
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while next_index < len(words):
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word = words[next_index]
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candidate = f"{current} {word}"
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if text_width(draw, candidate, font) <= max_width:
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current = candidate
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next_index += 1
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continue
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lines.append(current)
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current = word
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next_index += 1
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if len(lines) == max_lines - 1:
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break
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if next_index < len(words):
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# Ran out of lines with words still remaining -- fold the rest into
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# the last line and ellipsis-truncate it.
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current = current + " " + " ".join(words[next_index:])
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current = truncate_to_width(draw, current, font, max_width)
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lines.append(current)
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return lines[:max_lines]
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