Documentation

Overview

    Package png implements some of the PNG format using Restruct.

    Index

    Constants

    This section is empty.

    Variables

    This section is empty.

    Functions

    This section is empty.

    Types

    type Chunk

    type Chunk struct {
    	Len  uint32
    	Type string `struct:"[4]byte"`
    	Data struct {
    		IHDR *ChunkIHDR `struct-case:"$'IHDR'" json:",omitempty"`
    		IDAT *ChunkIDAT `struct-case:"$'IDAT'" json:",omitempty"`
    		IEND *ChunkIEND `struct-case:"$'IEND'" json:",omitempty"`
    		Raw  *ChunkRaw  `struct:"default" json:",omitempty"`
    	} `struct-switch:"Type"`
    	CRC uint32
    }

      Chunk contains the data of a single chunk.

      type ChunkIDAT

      type ChunkIDAT struct {
      	Parent *Chunk `struct:"parent" json:"-"`
      	Data   []byte `struct-size:"Parent.Len"`
      }

        ChunkIDAT contains the body of a IDAT chunk.

        type ChunkIEND

        type ChunkIEND struct {
        }

          ChunkIEND contains the body of a IEND chunk.

          type ChunkIHDR

          type ChunkIHDR struct {
          	Width             uint32
          	Height            uint32
          	BitDepth          byte
          	ColorType         ColorType
          	CompressionMethod byte
          	FilterMethod      byte
          	InterlaceMethod   byte
          }

            ChunkIHDR contains the body of a IHDR chunk.

            type ChunkPLTE

            type ChunkPLTE struct {
            }

              ChunkPLTE contains the body of a PLTE chunk.

              type ChunkRaw

              type ChunkRaw struct {
              	Parent *Chunk `struct:"parent" json:"-"`
              	Data   []byte `struct-size:"Parent.Len"`
              }

                ChunkRaw contains the body of an unrecognized chunk.

                type ColorType

                type ColorType byte

                  ColorType is used to specify the color format of a PNG.

                  const (
                  	ColorGreyscale      ColorType = 0
                  	ColorTrueColor      ColorType = 2
                  	ColorIndexed        ColorType = 3
                  	ColorGreyscaleAlpha ColorType = 4
                  	ColorTrueColorAlpha ColorType = 6
                  )

                    Enumeration of valid ColorTypes.

                    type File

                    type File struct {
                    	Magic  [8]byte
                    	Header Chunk
                    	Chunks []Chunk `struct-while:"!_eof"`
                    }

                      File contains the data of an image.

                      Source Files