copymem for unfiltered rows

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