pixie/tests/validate_png.nim

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import chroma, pixie/fileformats/png, pngsuite, stb_image/read as stbi, strformat
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for file in pngSuiteFiles:
let
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data = readFile(&"tests/fileformats/png/pngsuite/{file}.png")
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pixieLoaded = decodePng(data)
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var
width, height, channels: int
stbiLoadedData = loadFromMemory(
cast[seq[byte]](data),
width,
height,
channels,
stbi.RGBA
)
stbiLoadedRGBA: seq[ColorRGBA]
var i: int
while i < stbiLoadedData.len:
stbiLoadedRGBA.add(ColorRGBA(
r: stbiLoadedData[i + 0],
g: stbiLoadedData[i + 1],
b: stbiLoadedData[i + 2],
a: stbiLoadedData[i + 3]
))
i += 4
doAssert pixieLoaded.width == width
doAssert pixieLoaded.height == height
doAssert pixieLoaded.data.len == stbiLoadedRGBA.len
doAssert pixieLoaded.data == stbiLoadedRGBA