pixie/tests/test_png.nim

import pixie/common, pixie/fileformats/png, pngsuite, strformat

for file in pngSuiteFiles:
  let
    original = cast[seq[uint8]](
      readFile(&"tests/images/png/pngsuite/{file}.png")
    )
    decoded = decodePng(original)
    encoded = encodePng(decoded)
    decoded2 = decodePng(cast[seq[uint8]](encoded))

  doAssert decoded.height == decoded2.height
  doAssert decoded.width == decoded2.width
  doAssert decoded.data == decoded2.data

for channels in 1 .. 4:
  var data: seq[uint8]
  for x in 0 ..< 16:
    for y in 0 ..< 16:
      var components = newSeq[uint8](channels)
      for i in 0 ..< channels:
        components[i] = (x * 16).uint8
      data.add(components)
  let encoded = encodePng(16, 16, channels, data[0].addr, data.len)

for file in pngSuiteCorruptedFiles:
  try:
    discard decodePng(readFile(&"tests/images/png/pngsuite/{file}.png"))
    doAssert false
  except PixieError:
    discard