Module gift::block

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A GIF file consists of a sequence of Blocks in a specific order.

With some minor exceptions, the order is thus:

Structs

  • Application
    The application extension block is typically only used to enable looping animation. Other uses are ignored by most GIF readers.
  • ColorTableConfig
    A color table configuration defines the size and ordering of a color table.
  • Comment
    A comment extension block contains unstructured file metadata.
  • Frame
    A single frame of a GIF animation.
  • GlobalColorTable
    The global color table, if present, is used for all frames which do not define a LocalColorTable.
  • GraphicControl
    The graphic control extension block contains animation parameters for one frame.
  • Header
    The header contains the magic string “GIF”, followed by a version number.
  • ImageData
    An image data block contains image data for one frame.
  • ImageDesc
    The image descriptor block contains properties which apply to one frame.
  • LocalColorTable
    The local color table, if present, must immediately follow an image descriptor block.
  • LogicalScreenDesc
    The logical screen descriptor contains properties which apply to all frames in the file.
  • PlainText
    The plain text extension block is an obsolete GIF feature.
  • Preamble
    The preamble blocks are the first few blocks in a GIF file, before any frames.
  • Trailer
    The trailer block indicates the end of a GIF file.
  • Unknown
    Unknown extension blocks should not exist, but might be generated by non-standard encoders.

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