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java.lang.Object abbot.editor.widgets.GifDecoder
public class GifDecoder
Class GifDecoder - Decodes a GIF file into one or more frames.
Example: GifDecoder d = new GifDecoder(); d.read("sample.gif"); int n = d.getFrameCount(); for (int i = 0; i < n; i++) { BufferedImage frame = d.getFrame(i); // frame i int t = d.getDelay(i); // display duration of frame in milliseconds // do something with frame }No copyright asserted on the source code of this class. May be used for any purpose, however, refer to the Unisys LZW patent for any additional restrictions. Please forward any corrections to kweiner@fmsware.com.
Nested Class Summary | |
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(package private) static class |
GifDecoder.GifFrame
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Field Summary | |
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protected int[] |
act
|
protected int |
bgColor
|
protected int |
bgIndex
|
protected byte[] |
block
|
protected int |
blockSize
|
protected int |
delay
|
protected int |
dispose
|
protected int |
frameCount
|
protected ArrayList |
frames
|
protected int[] |
gct
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protected boolean |
gctFlag
|
protected int |
gctSize
|
protected int |
height
|
protected int |
ih
|
protected BufferedImage |
image
|
protected BufferedInputStream |
in
|
protected boolean |
interlace
|
protected int |
iw
|
protected int |
ix
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protected int |
iy
|
protected int |
lastBgColor
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protected int |
lastDispose
|
protected BufferedImage |
lastImage
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protected Rectangle |
lastRect
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protected int[] |
lct
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protected boolean |
lctFlag
|
protected int |
lctSize
|
protected int |
loopCount
|
protected static int |
MaxStackSize
|
protected int |
pixelAspect
|
protected byte[] |
pixels
|
protected byte[] |
pixelStack
|
protected short[] |
prefix
|
protected int |
status
|
static int |
STATUS_FORMAT_ERROR
File read status: Error decoding file (may be partially decoded) |
static int |
STATUS_OK
File read status: No errors. |
static int |
STATUS_OPEN_ERROR
File read status: Unable to open source. |
protected byte[] |
suffix
|
protected int |
transIndex
|
protected boolean |
transparency
|
protected int |
width
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Constructor Summary | |
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GifDecoder()
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Method Summary | |
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protected void |
decodeImageData()
Decodes LZW image data into pixel array. |
protected boolean |
err()
Returns true if an error was encountered during reading/decoding |
int |
getDelay(int n)
Gets display duration for specified frame. |
BufferedImage |
getFrame(int n)
Gets the image contents of frame n. |
int |
getFrameCount()
Gets the number of frames read from file. |
Dimension |
getFrameSize()
Gets image size. |
BufferedImage |
getImage()
Gets the first (or only) image read. |
int |
getLoopCount()
Gets the "Netscape" iteration count, if any. |
protected void |
init()
Initializes or re-initializes reader |
protected int |
read()
Reads a single byte from the input stream. |
int |
read(BufferedInputStream is)
Reads GIF image from stream |
int |
read(InputStream is)
Reads GIF image from stream |
int |
read(String name)
Reads GIF file from specified file/URL source (URL assumed if name contains ":/" or "file:") |
protected int |
readBlock()
Reads next variable length block from input. |
protected int[] |
readColorTable(int ncolors)
Reads color table as 256 RGB integer values |
protected void |
readContents()
Main file parser. |
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 void |
readNetscapeExt()
Reads Netscape extenstion to obtain iteration count |
protected int |
readShort()
Reads next 16-bit value, LSB first |
protected void |
resetFrame()
Resets frame state for reading next image. |
protected void |
setPixels()
Creates new frame image from current data (and previous frames as specified by their disposition codes). |
protected void |
skip()
Skips variable length blocks up to and including next zero length block. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final int STATUS_OK
public static final int STATUS_FORMAT_ERROR
public static final int STATUS_OPEN_ERROR
protected BufferedInputStream in
protected int status
protected int width
protected int height
protected boolean gctFlag
protected int gctSize
protected int loopCount
protected int[] gct
protected int[] lct
protected int[] act
protected int bgIndex
protected int bgColor
protected int lastBgColor
protected int pixelAspect
protected boolean lctFlag
protected boolean interlace
protected int lctSize
protected int ix
protected int iy
protected int iw
protected int ih
protected Rectangle lastRect
protected BufferedImage image
protected BufferedImage lastImage
protected byte[] block
protected int blockSize
protected int dispose
protected int lastDispose
protected boolean transparency
protected int delay
protected int transIndex
protected static final int MaxStackSize
protected short[] prefix
protected byte[] suffix
protected byte[] pixelStack
protected byte[] pixels
protected ArrayList frames
protected int frameCount
Constructor Detail |
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public GifDecoder()
Method Detail |
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public int getDelay(int n)
n
- int index of frame
public int getFrameCount()
public BufferedImage getImage()
public int getLoopCount()
protected void setPixels()
public BufferedImage getFrame(int n)
public Dimension getFrameSize()
public int read(BufferedInputStream is)
is
- BufferedInputStream
containing GIF file.
public int read(InputStream is)
is
- InputStream
containing GIF file.
public int read(String name)
name
- String containing source
protected void decodeImageData()
protected boolean err()
protected void init()
protected int read()
protected int readBlock()
protected int[] readColorTable(int ncolors)
ncolors
- int number of colors to read
protected void readContents()
protected void readGraphicControlExt()
protected void readHeader()
protected void readImage()
protected void readLSD()
protected void readNetscapeExt()
protected int readShort()
protected void resetFrame()
protected void skip()
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