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239 | class SkiaEngine(DrawEngine):
"""基于 skia-python 的进程内栅格引擎。"""
name = "skia"
kind = "raster"
requires = ("skia", "numpy", "PIL")
description = "skia-python 进程内栅格化（无磁盘 I/O，抗锯齿质量高）"
def _new_canvas(self, width: int, height: int):
import skia
surface = skia.Surface(width, height)
canvas = surface.getCanvas()
canvas.clear(skia.ColorTRANSPARENT)
return surface, canvas
# ------------------------------------------------------------------
# 圆角矩形
# ------------------------------------------------------------------
def render_roundrect(self, spec: RoundRectSpec):
import skia
width = max(1, int(round(spec.width)))
height = max(1, int(round(spec.height)))
surface, canvas = self._new_canvas(width, height)
stroke_width = float(spec.outline_width or 0.0)
# SVG 的描边是居中的；把几何内缩半个线宽，描边外沿才正好贴合 0..width
inset = stroke_width / 2.0 if stroke_width > 0 else 0.0
rx = max(0.0, float(spec.rx) - inset)
ry = max(0.0, float(spec.effective_ry) - inset)
rect = skia.Rect.MakeXYWH(
inset, inset, max(0.0, width - 2 * inset), max(0.0, height - 2 * inset)
)
rrect = skia.RRect.MakeRectXY(rect, rx, ry)
fill = parse_color(spec.fill, spec.fill_opacity)
if fill:
canvas.drawRRect(
rrect, skia.Paint(AntiAlias=True, Color=skia.Color(*fill))
)
if stroke_width > 0:
paint = self._stroke_paint(spec, stroke_width, inset, height)
if paint is not None:
canvas.drawRRect(rrect, paint)
return _to_pil(surface.makeImageSnapshot())
def _stroke_paint(self, spec, stroke_width, inset, height):
import skia
outline = parse_color(spec.outline, spec.outline_opacity)
if not outline:
return None
outline2 = (
parse_color(spec.outline2, spec.outline2_opacity)
if spec.outline2
else None
)
paint = skia.Paint(
AntiAlias=True,
Style=skia.Paint.kStroke_Style,
StrokeWidth=stroke_width,
)
if outline2 and outline2 != outline:
paint.setShader(
skia.GradientShader.MakeLinear(
points=[(float(inset), float(inset)),
(float(inset), float(height - inset))],
colors=[skia.Color(*outline), skia.Color(*outline2)],
positions=[float(spec.gradient_stop1), float(spec.gradient_stop2)],
)
)
else:
paint.setColor(skia.Color(*outline))
return paint
# ------------------------------------------------------------------
# 滑块进度条槽
# ------------------------------------------------------------------
def render_track(self, spec: TrackSpec):
import skia
width = max(1, int(round(spec.width)))
height = max(1, int(round(spec.height)))
surface, canvas = self._new_canvas(width, height)
radius = max(0.0, float(spec.radius))
left_w = max(0.0, min(float(spec.width2), float(width)))
track = parse_color(spec.track_fill, spec.track_opacity)
if track and left_w > 0:
canvas.drawRRect(
skia.RRect.MakeRectXY(
skia.Rect.MakeXYWH(0, 0, left_w, height), radius, radius
),
skia.Paint(AntiAlias=True, Color=skia.Color(*track)),
)
rail = parse_color(spec.rail_fill, spec.rail_opacity)
rail_w = width - left_w
if rail and rail_w > 0:
canvas.drawRRect(
skia.RRect.MakeRectXY(
skia.Rect.MakeXYWH(left_w, 0, rail_w, height), radius, radius
),
skia.Paint(AntiAlias=True, Color=skia.Color(*rail)),
)
return _to_pil(surface.makeImageSnapshot())
# ------------------------------------------------------------------
# 滑块把手
# ------------------------------------------------------------------
def render_thumb(self, spec: ThumbSpec):
import skia
width = max(1, int(round(spec.width)))
height = max(1, int(round(spec.height)))
surface, canvas = self._new_canvas(width, height)
cx, cy = width / 2.0, height / 2.0
r1 = float(spec.r1)
r2 = float(spec.r2)
outline = parse_color(spec.outline, spec.outline_opacity)
outline2 = (
parse_color(spec.outline2, spec.outline2_opacity)
if spec.outline2
else None
)
if outline:
paint = skia.Paint(AntiAlias=True)
if outline2 and outline2 != outline:
# 与既有 SVG 实现一致：竖直线性渐变，stop 0.500208 / 0.954545
paint.setShader(
skia.GradientShader.MakeLinear(
points=[(r1, 1.0), (r1, r1 * 2.0 - 1.0)],
colors=[skia.Color(*outline), skia.Color(*outline2)],
positions=[0.500208, 0.954545],
)
)
else:
paint.setColor(skia.Color(*outline))
canvas.drawCircle(cx, cy, r1, paint)
fill = parse_color(spec.fill, spec.fill_opacity)
if fill:
canvas.drawCircle(
cx, cy, max(0.0, r1 - 1.0),
skia.Paint(AntiAlias=True, Color=skia.Color(*fill)),
)
inner = parse_color(spec.inner_fill, spec.inner_fill_opacity)
if inner:
canvas.drawCircle(
cx, cy, r2, skia.Paint(AntiAlias=True, Color=skia.Color(*inner))
)
return _to_pil(surface.makeImageSnapshot())
|