Class GIFFileFormat

java.lang.Object
org.eclipse.swt.internal.image.FileFormat
org.eclipse.swt.internal.image.FileFormat.StaticImageFileFormat
org.eclipse.swt.internal.image.GIFFileFormat
public final class GIFFileFormat extends FileFormat.StaticImageFileFormat

  • Field Details

    • signature

      String signature

    • screenWidth

      int screenWidth

    • screenHeight

      int screenHeight

    • backgroundPixel

      int backgroundPixel

    • bitsPerPixel

      int bitsPerPixel

    • defaultDepth

      int defaultDepth

    • disposalMethod

      int disposalMethod

    • delayTime

      int delayTime

    • transparentPixel

      int transparentPixel

    • repeatCount

      int repeatCount

    • GIF_APPLICATION_EXTENSION_BLOCK_ID

      static final int GIF_APPLICATION_EXTENSION_BLOCK_ID
      See Also:

    • GIF_GRAPHICS_CONTROL_BLOCK_ID

      static final int GIF_GRAPHICS_CONTROL_BLOCK_ID
      See Also:

    • GIF_PLAIN_TEXT_BLOCK_ID

      static final int GIF_PLAIN_TEXT_BLOCK_ID
      See Also:

    • GIF_COMMENT_BLOCK_ID

      static final int GIF_COMMENT_BLOCK_ID
      See Also:

    • GIF_EXTENSION_BLOCK_ID

      static final int GIF_EXTENSION_BLOCK_ID
      See Also:

    • GIF_IMAGE_BLOCK_ID

      static final int GIF_IMAGE_BLOCK_ID
      See Also:

    • GIF_TRAILER_ID

      static final int GIF_TRAILER_ID
      See Also:

    • GIF89a

      static final byte[] GIF89a

    • NETSCAPE2_0

      static final byte[] NETSCAPE2_0

  • Constructor Details

    • GIFFileFormat

      public GIFFileFormat()

  • Method Details

    • grayRamp

      static PaletteData grayRamp(int numGrays)
      Answer a palette containing numGrays shades of gray, ranging from black to white.

    • isFileFormat

      boolean isFileFormat(LEDataInputStream stream) throws IOException
      Description copied from class: FileFormat
      Return whether or not the specified input stream represents a supported file format.
      Specified by:
      isFileFormat in class FileFormat
      Throws:
      IOException

    • loadFromByteStream

      ImageData[] loadFromByteStream()
      Load the GIF image(s) stored in the input stream. Return an array of ImageData representing the image(s).
      Specified by:
      loadFromByteStream in class FileFormat.StaticImageFileFormat

    • readID

      int readID()
      Read and return the next block or extension identifier from the file.

    • readExtension

      byte[] readExtension()
      Read a control extension. Return the extension block data.

    • readCommentExtension

      byte[] readCommentExtension()
      We have just read the Comment extension identifier from the input stream. Read in the rest of the comment and return it. GIF comment blocks are variable size.

    • readPlainTextExtension

      byte[] readPlainTextExtension()
      We have just read the PlainText extension identifier from the input stream. Read in the plain text info and text, and return the text. GIF plain text blocks are variable size.

    • readGraphicsControlExtension

      byte[] readGraphicsControlExtension()
      We have just read the GraphicsControl extension identifier from the input stream. Read in the control information, store it, and return it.

    • readApplicationExtension

      byte[] readApplicationExtension()
      We have just read the Application extension identifier from the input stream. Read in the rest of the extension, look for and store 'number of repeats', and return the data.

    • readImageBlock

      ImageData readImageBlock(PaletteData defaultPalette)
      Return a DeviceIndependentImage representing the image block at the current position in the input stream. Throw an error if an error occurs.

    • readPalette

      PaletteData readPalette(int numColors)
      Read a palette from the input stream.

    • unloadIntoByteStream

      void unloadIntoByteStream(ImageLoader loader)
      Specified by:
      unloadIntoByteStream in class FileFormat

    • writeGraphicsControlBlock

      void writeGraphicsControlBlock(ImageData image)
      Write out a GraphicsControlBlock to describe the specified device independent image.

    • writePalette

      void writePalette(PaletteData palette, int depth)
      Write the specified palette to the output stream.