PngCodec

Compress

public static byte[] Compress(RasterImage image)

result = PngCodec.Compress(image)

Packs the pixels the way an IDAT chunk of an RGBA8 picture holds them: scanlines in a zlib stream, filtered if that makes the stream shorter.

Crc

public static uint Crc(ReadOnlySpan<byte> content)

result = PngCodec.Crc(content)

The checksum of a chunk: of its tag and its content together.

Encode

public static byte[] Encode(RasterImage image, byte[] colorChunks)

result = PngCodec.Encode(image, colorChunks)

Writes a picture as an RGBA8 PNG.

image

The picture.

colorChunks

The chunks that say what colors the samples are, whole and ready to be written: what Byte}) or Byte[]) gave. Empty for none.

ProfileChunk

public static byte[] ProfileChunk(byte[] profile)

result = PngCodec.ProfileChunk(profile)

Makes the iCCP chunk that holds an ICC profile.

profile

The profile; empty for none.

返回值: The chunk, whole; empty if there is no profile.

ReadColorChunks

public static byte[] ReadColorChunks(ReadOnlySpan<byte> data)

result = PngCodec.ReadColorChunks(data)

Reads the chunks of a PNG that say what colors its samples are - cHRM, gAMA, iCCP, sRGB - so that a picture made of it can say the same.

返回值: The chunks, whole, one after another. A profile is among them only if it can go into a re-encoded picture (see Byte})), and sRGB only if there is no profile: a file holds one or the other.