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Quantize each vertex only once. #458

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Merged
treeform merged 2 commits into from
Jun 30, 2022
Merged

Quantize each vertex only once. #458

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dffad18
Quantize each vertex only once.
treeform Jun 30, 2022
ba5681e
Cleanup.
treeform Jun 30, 2022
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25 changes: 17 additions & 8 deletions src/pixie/paths.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -1054,8 +1054,23 @@ proc commandsToShapes(

proc shapesToSegments(shapes: seq[Polygon]): seq[(Segment, int16)] =
## Converts the shapes into a set of filtered segments with winding value.
for shape in shapes:
for segment in shape.segments:

# Quantize the segment to prevent leaks
template quantizeY(v: Vec2): Vec2 =
vec2(v.x, v.y.quantize(1 / 256))

for poly in shapes:
var
vec1 = poly[^1].quantizeY()
vec2: Vec2
segment: Segment
for i in 0 ..< poly.len:
vec2 = poly[i].quantizeY()
if i == 0 and vec1 == vec2:
continue
segment = segment(vec1, vec2)
vec1 = vec2

if segment.at.y == segment.to.y: # Skip horizontal
continue
var
Expand All @@ -1065,12 +1080,6 @@ proc shapesToSegments(shapes: seq[Polygon]): seq[(Segment, int16)] =
swap(segment.at, segment.to)
winding = -1

# Quantize the segment to prevent leaks
segment = segment(
vec2(segment.at.x.quantize(1 / 256), segment.at.y.quantize(1 / 256)),
vec2(segment.to.x.quantize(1 / 256), segment.to.y.quantize(1 / 256))
)

result.add((segment, winding))

proc transform(shapes: var seq[Polygon], transform: Mat3) =
Expand Down