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Add comment on AM hole handling in cairo backend

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jaseg 2021-06-13 22:17:39 +02:00
parent 66da2d1654
commit 5225d3da8b
1 changed files with 4 additions and 0 deletions
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4
gerbonara/gerber/render/cairo_backend.py
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@ -513,6 +513,10 @@ class GerberCairoContext(GerberContext):
self.ctx.mask_surface(mask.surface, self.origin_in_pixels[0])
def _render_amgroup(self, amgroup, color):
# Since holes/clear areas in the mask group must be drawn as clear, we need to render the primitives of this
# group into a mask context first, then composite this mask context on top of our output surface. This means
# that a clear primitive inside the group will cover/draw over dark primitives inside the group, but it will
# *not* cover/draw over dark primitives outside the group.
mask_surface = cairo.SVGSurface(None, self.size_in_pixels[0], self.size_in_pixels[1])
mask_ctx = cairo.Context(mask_surface)