writePngLazy

turns a range of png scanlines into a png file in the output range. really weird

void
writePngLazy
(
OutputRange
InputRange
)
(
ref OutputRange where
,
InputRange image
)
if (
isOutputRange!(OutputRange, ubyte[]) &&
isInputRange!(InputRange)
&&
is(ElementType!InputRange == RgbaScanline)
)

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