Static Public Member Functions
static void	createImage (String name, int width, int height, int bitsPerPixel)
static void	openImage (String location)
static PImage	getImage (String name)
static void	parseData (String inputLine)
static boolean	getReadImageData ()
static int	getMissingRemainingBytes ()
Static Package Attributes
static HashMap< String, PImage >	images = new HashMap<String, PImage>()
static boolean	readImageData = false
static String	imageName = null
static int	bytesRead = 0
static int	bpp = 0
static int	pictureArray []
static int	bytePerPixel = 0
static int	width = 0
static int	height = 0

Detailed Description

The ScrollViewImageHandler is a helper class which takes care of image processing. It is used to construct an Image from the message-stream and basically consists of a number of utility functions to process the input stream.

Author:: wanke@google.com

Definition at line 26 of file SVImageHandler.java.

Member Function Documentation

static void com.google.scrollview.ui.SVImageHandler.createImage	(	String	name,
		int	width,
		int	height,
		int	bitsPerPixel
	)		`[inline, static]`

Starts creation of a new image.

Definition at line 146 of file SVImageHandler.java.

                        {
    // Create buffered image that does not support transparency
    bpp = bitsPerPixel;
    if (bpp == 1) {
      bytePerPixel = 1;
    } else if (bpp == 8) {
      bytePerPixel = 2;
    } else if (bpp == 32) {
      bytePerPixel = 7;
    } else {
      throw new IllegalArgumentException(
          "bpp should be 1 (binary), 8 (gray) or 32 (argb), is " + bpp);
    }
    if (imageName != null) {
      throw new IllegalArgumentException("Image " + imageName + " already opened!");
    }
    else {
      imageName = name;
      bytesRead = 0;
      readImageData = true;
      SVImageHandler.height = height;
      SVImageHandler.width = width;
      pictureArray = new int[width * height];
    }   

    System.out.println("Processing Image with " + bpp + " bpp, size " + width + "x" + height);
  }

static PImage com.google.scrollview.ui.SVImageHandler.getImage ( String name ) [inline, static]

Find the image corresponding to a given name

Definition at line 189 of file SVImageHandler.java.

                                             {
    return images.get(name);
  }

static int com.google.scrollview.ui.SVImageHandler.getMissingRemainingBytes ( ) [inline, static]

Computes how many bytes of the image data are still missing

Definition at line 225 of file SVImageHandler.java.

                                               {
    return (height * width * bytePerPixel) - bytesRead;
  }

static boolean com.google.scrollview.ui.SVImageHandler.getReadImageData ( ) [inline, static]

Returns whether we a currently reading image data or not

Definition at line 220 of file SVImageHandler.java.

                                           {
    return readImageData;
  }

static void com.google.scrollview.ui.SVImageHandler.openImage ( String location ) [inline, static]

Opens an Image from location. This means the image does not have to be actually transfered over the network. Thus, it is a lot faster than using the createImage method.

Parameters:

location The (local) location from where to open the file. This is also the internal name associated with the image (if you want to draw it).

Definition at line 183 of file SVImageHandler.java.

                                                {
    PImage img = new PImage(location);
    images.put(location, img);
  }

static void com.google.scrollview.ui.SVImageHandler.parseData ( String inputLine ) [inline, static]

Gets called while currently reading image data. Decides, how to process it (which image type, whether all data is there).

Definition at line 197 of file SVImageHandler.java.

                                                 {
    int[] data = null;

    if (bpp == 1) {
      data = processBinaryImage(inputLine);
    } else if (bpp == 8) {
      data = processGrayImage(inputLine);
    } else if (bpp == 32) {
      data = process32bppImage(inputLine);
    } else {
      System.out.println("Unsupported Bit Type: " + bpp);
    }

    System.arraycopy(data, 0, pictureArray, bytesRead, data.length);
    bytesRead += data.length;

    // We have read all image data - close the image
    if (bytesRead == (height * width)) {
      closeImage();
    }
  }