Package com.lowagie.text.pdf.codec

Class GifImage

java.lang.Object
com.lowagie.text.pdf.codec.GifImage
public class GifImage extends Object
Reads gif images of all types. All the images in a gif are read in the constructors and can be retrieved with other methods.
Author:
Paulo Soares (psoares@consiste.pt)

  • Field Details

    • in

      protected DataInputStream in

    • width

      protected int width

    • height

      protected int height

    • gctFlag

      protected boolean gctFlag

    • bgIndex

      protected int bgIndex

    • bgColor

      protected int bgColor

    • pixelAspect

      protected int pixelAspect

    • lctFlag

      protected boolean lctFlag

    • interlace

      protected boolean interlace

    • lctSize

      protected int lctSize

    • ix

      protected int ix

    • iy

      protected int iy

    • iw

      protected int iw

    • ih

      protected int ih

    • block

      protected byte[] block

    • blockSize

      protected int blockSize

    • dispose

      protected int dispose

    • transparency

      protected boolean transparency

    • delay

      protected int delay

    • transIndex

      protected int transIndex

    • MaxStackSize

      protected static final int MaxStackSize
      See Also:

    • prefix

      protected short[] prefix

    • suffix

      protected byte[] suffix

    • pixelStack

      protected byte[] pixelStack

    • pixels

      protected byte[] pixels

    • m_out

      protected byte[] m_out

    • m_bpc

      protected int m_bpc

    • m_gbpc

      protected int m_gbpc

    • m_global_table

      protected byte[] m_global_table

    • m_local_table

      protected byte[] m_local_table

    • m_curr_table

      protected byte[] m_curr_table

    • m_line_stride

      protected int m_line_stride

    • fromData

      protected byte[] fromData

    • fromUrl

      protected URL fromUrl

    • frames

      protected ArrayList frames

  • Constructor Details

    • GifImage

      public GifImage(URL url) throws IOException
      Reads gif images from an URL.
      Parameters:
      url - the URL
      Throws:
      IOException - on error

    • GifImage

      public GifImage(String file) throws IOException
      Reads gif images from a file.
      Parameters:
      file - the file
      Throws:
      IOException - on error

    • GifImage

      public GifImage(byte[] data) throws IOException
      Reads gif images from a byte array.
      Parameters:
      data - the byte array
      Throws:
      IOException - on error

    • GifImage

      public GifImage(InputStream is) throws IOException
      Reads gif images from a stream. The stream is not closed.
      Parameters:
      is - the stream
      Throws:
      IOException - on error

  • Method Details

    • getFrameCount

      public int getFrameCount()
      Gets the number of frames the gif has.
      Returns:
      the number of frames the gif has

    • getImage

      public Image getImage(int frame)
      Gets the image from a frame. The first frame is 1.
      Parameters:
      frame - the frame to get the image from
      Returns:
      the image

    • getFramePosition

      public int[] getFramePosition(int frame)
      Gets the [x,y] position of the frame in reference to the logical screen.
      Parameters:
      frame - the frame
      Returns:
      the [x,y] position of the frame

    • getLogicalScreen

      public int[] getLogicalScreen()
      Gets the logical screen. The images may be smaller and placed in some position in this screen to playback some animation. No image will be be bigger that this.
      Returns:
      the logical screen dimensions as [x,y]

    • readHeader

      protected void readHeader() throws IOException
      Reads GIF file header information.
      Throws:
      IOException

    • readLSD

      protected void readLSD() throws IOException
      Reads Logical Screen Descriptor
      Throws:
      IOException

    • readShort

      protected int readShort() throws IOException
      Reads next 16-bit value, LSB first
      Throws:
      IOException

    • readBlock

      protected int readBlock() throws IOException
      Reads next variable length block from input.
      Returns:
      number of bytes stored in "buffer"
      Throws:
      IOException

    • readColorTable

      protected byte[] readColorTable(int bpc) throws IOException
      Throws:
      IOException

    • newBpc

      protected static int newBpc(int bpc)

    • readContents

      protected void readContents() throws IOException
      Throws:
      IOException

    • readImage

      protected void readImage() throws IOException
      Reads next frame image
      Throws:
      IOException

    • decodeImageData

      protected boolean decodeImageData() throws IOException
      Throws:
      IOException

    • setPixel

      protected void setPixel(int x, int y, int v)

    • resetFrame

      protected void resetFrame()
      Resets frame state for reading next image.

    • readGraphicControlExt

      protected void readGraphicControlExt() throws IOException
      Reads Graphics Control Extension values
      Throws:
      IOException

    • skip

      protected void skip() throws IOException
      Skips variable length blocks up to and including next zero length block.
      Throws:
      IOException