GifImage (iText 5.5.13 API)

java.lang.Object
- com.itextpdf.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

Field Summary

Fields
Modifier and Type	Field and Description
`protected int`	`bgColor`
`protected int`	`bgIndex`
`protected byte[]`	`block`
`protected int`	`blockSize`
`protected int`	`delay`
`protected int`	`dispose`
`protected ArrayList`	`frames`
`protected byte[]`	`fromData`
`protected URL`	`fromUrl`
`protected boolean`	`gctFlag`
`protected int`	`height`
`protected int`	`ih`
`protected DataInputStream`	`in`
`protected boolean`	`interlace`
`protected int`	`iw`
`protected int`	`ix`
`protected int`	`iy`
`protected boolean`	`lctFlag`
`protected int`	`lctSize`
`protected int`	`m_bpc`
`protected byte[]`	`m_curr_table`
`protected int`	`m_gbpc`
`protected byte[]`	`m_global_table`
`protected int`	`m_line_stride`
`protected byte[]`	`m_local_table`
`protected byte[]`	`m_out`
`protected static int`	`MaxStackSize`
`protected int`	`pixelAspect`
`protected byte[]`	`pixels`
`protected byte[]`	`pixelStack`
`protected short[]`	`prefix`
`protected byte[]`	`suffix`
`protected int`	`transIndex`
`protected boolean`	`transparency`
`protected int`	`width`

Constructor Summary

Constructors
Constructor and Description
`GifImage(byte[] data)` Reads gif images from a byte array.
`GifImage(InputStream is)` Reads gif images from a stream.
`GifImage(String file)` Reads gif images from a file.
`GifImage(URL url)` Reads gif images from an URL.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected boolean`	`decodeImageData()`
`int`	`getFrameCount()` Gets the number of frames the gif has.
`int[]`	`getFramePosition(int frame)` Gets the [x,y] position of the frame in reference to the logical screen.
`Image`	`getImage(int frame)` Gets the image from a frame.
`int[]`	`getLogicalScreen()` Gets the logical screen.
`protected static int`	`newBpc(int bpc)`
`protected int`	`readBlock()` Reads next variable length block from input.
`protected byte[]`	`readColorTable(int bpc)`
`protected void`	`readContents()`
`protected void`	`readGraphicControlExt()` Reads Graphics Control Extension values
`protected void`	`readHeader()` Reads GIF file header information.
`protected void`	`readImage()` Reads next frame image
`protected void`	`readLSD()` Reads Logical Screen Descriptor
`protected int`	`readShort()` Reads next 16-bit value, LSB first
`protected void`	`resetFrame()` Resets frame state for reading next image.
`protected void`	`setPixel(int x, int y, int v)`
`protected void`	`skip()` Skips variable length blocks up to and including next zero length block.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

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:

Constant Field Values

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 Detail
- 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 Detail
- 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

Class GifImage

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

in

width

height

gctFlag

bgIndex

bgColor

pixelAspect

lctFlag

interlace

lctSize

ix

iy

iw

ih

block

blockSize

dispose

transparency

delay

transIndex

MaxStackSize

prefix

suffix

pixelStack

pixels

m_out

m_bpc

m_gbpc

m_global_table

m_local_table

m_curr_table

m_line_stride

fromData

fromUrl

frames

Constructor Detail

GifImage

GifImage

GifImage

GifImage

Method Detail

getFrameCount

getImage

getFramePosition

getLogicalScreen

readHeader

readLSD

readShort

readBlock

readColorTable

newBpc

readContents

readImage

decodeImageData

setPixel

resetFrame

readGraphicControlExt

skip