Reads GIF image from stream @param is : BufferedInputStream containing GIF file. @return read status code (0 = no errors)

Returns true if an error was encountered during reading/decoding

Write 16-bit value to output stream, LSB first

Reads next 16-bit value, LSB first

Jump to a specific location (in frames). if the frame does not exist, go to last frame @param where : file location (in sketch)

Reads next variable length block from input. @return number of bytes stored in "buffer"

Gets the image contents of frame n. @param n : frame number @return BufferedImage representation of frame, or null if n is invalid.

Initializes or re-initializes reader

Skips variable length blocks up to and including next zero length block.

Stop the animation, and rewind.

Gets the number of frames read from file. @return frame count

Reads color table as 256 RGB integer values @param ncolors int number of colors to read @return int array containing 256 colors (packed ARGB

Main file parser. Reads GIF content blocks.

Reads GIF file header information.

Initiates GIF file creation on the given stream. The stream is not closed automatically. @param os OutputStream on which GIF images are writ

Writes color table

Writes string to output stream

Analyzes image colors and creates color map.

Decodes LZW image data into pixel array. Adapted from John Cristy's ImageMagick.

Returns index of palette color closest to c

Gets display duration for specified frame. @param n int index of frame @return delay in milliseconds

Extracts image pixels into byte array "pixels"

Gets the "Netscape" iteration count, if any. A count of 0 means repeat indefinitiely. @return iteration count if one was specified, else 1.

Reads Graphics Control Extension values

Reads next frame image

Reads Logical Screen Descriptor

Reads Netscape extension to obtain iteration count

Resets frame state for reading next image.

Creates new frame image from current data (and previous frames as specified by their disposition codes).

description taken from GifEncoder-class: Sets quality of color quantization (conversion of images to the maximum 256 colors allowed by the GIF specifi

Sets the GIF frame size. The default size is the size of the first frame added if this method is not invoked. @param w int frame width. @par

Writes Graphic Control Extension

Writes Image Descriptor

Writes Logical Screen Descriptor

Writes Netscape application extension to define repeat count.

Encodes and writes pixel data

Adds next GIF frame. The frame is not written immediately, but is actually deferred until the next frame is received so that timing data can be insert

Flushes any pending data and closes output file. If writing to an OutputStream, the stream is not closed. @return true if data output closed

Gets image size. @return GIF image dimensions

Gets the first (or only) image read. @return BufferedImage containing first frame, or null if none.

Begin playing the animation, with repeat.

Shut off the repeating loop.

Pause the animation at its current frame.

Begin playing the animation, with no repeat.

Sets the delay time between each frame, or changes it for subsequent frames (applies to last frame added). @param ms int delay time in milli

Sets the GIF frame disposal code for the last added frame and any subsequent frames. Default is 0 if no transparent color has been set, otherwise 2.

Sets frame rate in frames per second. Equivalent to <code>setDelay(1000/fps)</code>. @param fps float frame rate (frames per second)

Sets quality of color quantization (conversion of images to the maximum 256 colors allowed by the GIF specification). Lower values (minimum = 1) produ

Sets the number of times the set of GIF frames should be played. Default is 1; 0 means play indefinitely. Must be invoked before the first image is ad

Sets the transparent color for the last added frame and any subsequent frames. Since all colors are subject to modification in the quantization proces