PngHelper
Reads what a PNG picture states about itself in its header, without decoding the picture.
メソッド
public static Size GetPngSize(ReadOnlySpan<byte> data)result = PngHelper.GetPngSize(data)Reads the size of a PNG picture off its header.
- data
- The picture, or as much of its beginning as holds the header.
戻り値: The size of the picture, in pixels.
public static Size GetPngSize(byte[] data)result = PngHelper.GetPngSize(data)Reads the size of a PNG picture off its header.
- data
- The picture, or as much of its beginning as holds the header.
戻り値: The size of the picture, in pixels.
public static bool IsPng(ReadOnlySpan<byte> data)result = PngHelper.IsPng(data)Determines whether the data is a PNG picture, by the signature every PNG picture starts with.
- data
- The data.
戻り値: if the data starts with the PNG signature.
public static bool IsPng(byte[] data)result = PngHelper.IsPng(data)Determines whether the data is a PNG picture, by the signature every PNG picture starts with.
- data
- The data.
戻り値: if the data starts with the PNG signature.
public static bool TryGetPngSize(ReadOnlySpan<byte> data, Size size)result = PngHelper.TryGetPngSize(data, size)Reads the size of a PNG picture off its header.
- data
- The picture, or as much of its beginning as holds the header.
- size
- The size of the picture, in pixels.
戻り値: if the PNG header is missing or its length or dimensions are invalid.
public static bool TryGetPngSize(byte[] data, Size size)result = PngHelper.TryGetPngSize(data, size)Reads the size of a PNG picture off its header.
- data
- The picture, or as much of its beginning as holds the header.
- size
- The size of the picture, in pixels.
戻り値: if the PNG header is missing or its length or dimensions are invalid.