khodowany
102 lines
4.3 KiB
Python
102 lines
4.3 KiB
Python
from __future__ import annotations
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import dataclasses
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import math
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import PIL.Image
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import PIL.ImageDraw
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import aggdraw
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import fontTools.pens.basePen
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import generator.engraving.fonts
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import generator.engraving.types
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class OutlinePen(fontTools.pens.basePen.BasePen):
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def __init__(self, glyphs, scale: float, x: float, y: float):
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super().__init__(glyphs)
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self.path = aggdraw.Path()
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self.scale, self.x, self.y = scale, x, y
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def point(self, point):
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return self.x + point[0] * self.scale, self.y - point[1] * self.scale
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def _moveTo(self, point):
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self.path.moveto(*self.point(point))
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def _lineTo(self, point):
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self.path.lineto(*self.point(point))
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def _curveToOne(self, first, second, last):
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self.path.curveto(*self.point(first), *self.point(second), *self.point(last))
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def _closePath(self):
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self.path.close()
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def _endPath(self):
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pass
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def rasterize_page(page: generator.engraving.types.Page, fonts: generator.engraving.fonts.Fonts) -> PIL.Image.Image:
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return rasterize_band(page, page.primitives, 0, page.height, fonts)
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def rasterize_band(page: generator.engraving.types.Page, primitives: tuple[generator.engraving.types.Primitive, ...], top: int, bottom: int, fonts: generator.engraving.fonts.Fonts) -> PIL.Image.Image:
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scale = page.supersampling
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image = PIL.Image.new('RGB', (page.width * scale, (bottom - top) * scale), 'white')
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context = aggdraw.Draw(image)
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for item in primitives:
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points = [(x * scale, y * scale - top * scale) for x, y in item.points]
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if item.kind == 'text':
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continue
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if item.kind == 'glyph':
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pen = OutlinePen(fonts.glyphs, item.size * scale / fonts.units, *points[0])
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fonts.outline(item.value).replay(pen)
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path = pen.path
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else:
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path = aggdraw.Path()
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path.moveto(*points[0])
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if item.kind == 'curve':
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path.curveto(*points[1], *points[2], *points[3])
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else:
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for point in points[1:]:
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path.lineto(*point)
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if item.kind == 'polygon':
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path.close()
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if item.kind in ('glyph', 'polygon'):
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context.path(path, None, aggdraw.Brush('black'))
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else:
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context.path(path, aggdraw.Pen('black', item.thickness * scale))
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context.flush()
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drawing = PIL.ImageDraw.Draw(image)
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for item in primitives:
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if item.kind == 'text':
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x, y = item.points[0]
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drawing.text((x * scale, y * scale - top * scale), item.value, font=fonts.text_font(item.size * scale), anchor='ls', fill='black')
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return image.resize((page.width, bottom - top), PIL.Image.Resampling.LANCZOS)
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@dataclasses.dataclass(frozen=True)
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class Band:
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top: int
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bottom: int
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primitives: tuple[generator.engraving.types.Primitive, ...]
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def page_bands(page: generator.engraving.types.Page) -> tuple[Band, Band, Band] | None:
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body = tuple(p for system in page.systems for p in system.primitives)
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header = tuple(p for p in page.primitives if p.role in ('title', 'subtitle'))
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footer = tuple(p for p in page.primitives if p.role == 'page-number')
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if not body or not header or not footer or page.primitives != header + body + footer:
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return None
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bands = []
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for primitives in (header, body, footer):
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box = generator.engraving.types.bounds(primitives)
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if not box.finite() or box.left < 4 or box.right > page.width - 4 or box.top < 4 or box.bottom > page.height - 4:
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return None
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# Six output pixels cover raster antialiasing and the three-pixel Lanczos
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# support. Integer crop origins preserve the full-page sampling phase.
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bands.append(Band(max(0, math.floor(box.top) - 6), min(page.height, math.ceil(box.bottom) + 6), primitives))
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if bands[0].bottom > bands[1].top or bands[1].bottom > bands[2].top:
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return None
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return tuple(bands)
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def compose_page(page: generator.engraving.types.Page, fonts: generator.engraving.fonts.Fonts, bands: tuple[Band, Band, Band], body: PIL.Image.Image) -> PIL.Image.Image:
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image = PIL.Image.new('RGB', (page.width, page.height), 'white')
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if body.mode != 'RGB' or body.size != (page.width, bands[1].bottom - bands[1].top):
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raise generator.engraving.types.EngravingError('notation band has incompatible geometry')
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image.paste(body, (0, bands[1].top))
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for band in (bands[0], bands[2]):
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with rasterize_band(page, band.primitives, band.top, band.bottom, fonts) as decoration:
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image.paste(decoration, (0, band.top))
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return image
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