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copymem for unfiltered rows

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Ryan Oldenburg 2021-04-28 17:04:34 -05:00
parent 6c9abf4084
commit 4804293a4a
1 changed files with 5 additions and 3 deletions
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8
src/pixie/fileformats/png.nim
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@ -104,9 +104,11 @@ proc unfilter(
let filterType = uncompressed[uncompressedIdx(0, y)] let filterType = uncompressed[uncompressedIdx(0, y)]
case filterType: case filterType:
of 0: # None of 0: # None
for x in 0 ..< rowBytes: copyMem(
var value = uncompressed[uncompressedIdx(x + 1, y)] result[unfiteredIdx(0, y)].addr,
result[unfiteredIdx(x, y)] = value uncompressed[uncompressedIdx(1, y)].unsafeAddr,
rowBytes
)
of 1: # Sub of 1: # Sub
for x in 0 ..< rowBytes: for x in 0 ..< rowBytes:
var value = uncompressed[uncompressedIdx(x + 1, y)] var value = uncompressed[uncompressedIdx(x + 1, y)]