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LibGfx: Fix IHDR filter method field validation
As per the PNG specification: "Filter method is a single-byte integer that indicates the preprocessing method applied to the image data before compression. At present, only filter method 0 (adaptive filtering with five basic filter types) is defined."
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@ -829,7 +829,7 @@ static bool is_valid_compression_method(u8 compression_method)
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static bool is_valid_filter_method(u8 filter_method)
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{
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return filter_method <= 4;
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return filter_method == 0;
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}
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static bool process_IHDR(ReadonlyBytes data, PNGLoadingContext& context)
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