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Class Bitmap

public class netscape.application.Bitmap
    extends netscape.application.Image
{
    /* Constructors
     */
    public Bitmap();
    public Bitmap(int, int);
    public Bitmap(int[], int, int);
    public Bitmap(int[], int, int, int, int);

    /* Methods
     */
    public static Bitmap bitmapFromURL(URL);
    public static synchronized Bitmap bitmapNamed(String, boolean);
    public static Bitmap bitmapNamed(String);

    public Graphics createGraphics();
    public void decode(Decoder);
    public void describeClassInfo(ClassInfo);
    public void drawAt(Graphics, int, int);
    public void drawScaled(Graphics, int, int, int, int);
    public void encode(Encoder);
    public void flush();
    public boolean grabPixels(int[]);
    public boolean grabPixels(int[], int, int, int, int, int, int);
    public boolean hasLoadedData();
    public int height();
    public boolean isTransparent();
    public boolean isValid();
    public void loadData();
    public boolean loadsIncrementally();
    public String name();
    public void setLoadsIncrementally(boolean);
    public void setTransparent(boolean);
    public synchronized void setUpdateCommand(String);
    public synchronized void setUpdateTarget(Target);
    public String toString();
    public synchronized String updateCommand();
    public synchronized Rect updateRect();
    public synchronized Target updateTarget();
    public int width();
}

    bitmap = Bitmap.bitmapNamed("ColorBackground.gif");

    bitmap = new Bitmap(width, height);
    g = new Graphics(bitmap);

Constructors

Bitmap

  public Bitmap()

Constructs a Bitmap with no name and no data. This method is only useful when decoding.

Bitmap

  public Bitmap(int width,
                int height)

Constructs a Bitmap of size (width, height) with blank contents. Typically, you use Bitmaps with no contents for offscreen composition.

Bitmap

  public Bitmap(int pixels[],
                int width,
                int height)

Constructs a Bitmap of size (width, height) with contents derived from the integer array pixels. Equivalent to the code:

    Bitmap(pixels, width, height, 0, width)

See Also:

Bitmap

Bitmap

  public Bitmap(int pixels[],
                int width,
                int height,
                int offset,
                int scanSize)

Constructs a Bitmap of size (width, height) with contents derived from the integer array pixels. offset indicates the position of the first pixel in the array. scanSize indicates the number of pixels in the array per line.

The format follows the default Java color model, where each pixel is a 32-bit integer. Bits 24-31 are the alpha transparency, bits 16-23 are the red value, bits 8-15 are the green value, and bits 0-7 are the blue value.

Methods

  public static synchronized Bitmap bitmapNamed(String bitmapName,
                                                boolean startLoading)

Returns the Bitmap named bitmapName. The application maintains a cache of named Bitmaps that it checks first. If not located in the cache, this method looks for the specified bitmap in the "images" directory in the same directory as the Application's index.html file. In other words, it constructs the URL

    "codebase"/images/bitmapName

and attempts to load this image. bitmapName can specify a file name or path, such as "newImages/ColorBackground.gif". This method starts loading the bitmap's data if startLoading is true. Otherwise, the IFC retrieves the data when needed.

  public static Bitmap bitmapNamed(String bitmapName)

Convenience method for retrieving the bitmap bitmapName. Immediately begins loading its data. Equivalent to the code:

    Bitmap.bitmapNamed(bitmapName, true);

See Also:

bitmapNamed

  public static Bitmap bitmapFromURL(URL url)

Returns a Bitmap initialized with data from the URL url.

  public Graphics createGraphics()

Returns a graphics object that can be used to draw into the Bitmap. The dispose() method should be called on this object when no longer needed, to immediately free its resources. Bitmap subclasses can override this method to provide callers a Graphics subclass instance.

  public boolean grabPixels(int pixels[])

Fills the integer array pixels with 32-bit pixel values for the entire Bitmap. The array should be large enough to hold (width() * height()) values. Equivalent to the code:

    grabPixels(pixels, 0, 0, width(), height(), 0, width());

Returns true on success, false on failure.

See Also:

Bitmap, grabPixels

  public boolean grabPixels(int pixels[],
                            int x,
                            int y,
                            int width,
                            int height,
                            int offset,
                            int scanSize)

Fills the integer array pixels with 32-bit pixel values for the Bitmap. The array should be large enough to hold (width height) values. x and y determine the origin of the rectangle of pixels to retrieve from the Bitmap, relative to the default (unscaled) size of the Bitmap. width and height indicate the size of the rectangle. offset indicates how far into the array the first pixel should be stored. scanSize is the distance from the start of one row of pixels to the start of the next row in the array. The pixel format follows the default Java RGB color model.

Returns true on success, false on failure.

See Also:

Bitmap

  public String name()

Returns the name used to load the Bitmap. Returns null if the Bitmap was not obtained via Bitmap.bitmapNamed().

Overrides:

name in class Image

See Also:

bitmapNamed

  public int width()

Returns the Bitmap's width. Begins loading the Bitmap's data, if necessary, returning once the Bitmap's size information becomes available.

Overrides:

width in class Image

  public int height()

Returns the Bitmap's height. Begins loading the Bitmap's data, if necessary, returning once the Bitmap's size information becomes available.

Overrides:

height in class Image

  public void setTransparent(boolean transparent)

Sets whether the Bitmap is transparent.

See Also:

isTransparent

  public boolean isTransparent()

Returns true if the Bitmap is transparent. This method does not check the Bitmap's data. A Bitmap assumes itself transparent unless modified using the setTransparent() method. Returning true is always safe, but an Image user may be able to avoid drawing the region under the Image if this method returns false.

Overrides:

isTransparent in class Image

See Also:

setTransparent

  public void drawAt(Graphics g,
                     int x,
                     int y)

Draws the Bitmap at (x, y).

Overrides:

drawAt in class Image

  public void drawScaled(Graphics g,
                         int x,
                         int y,
                         int width,
                         int height)

Draws the Bitmap scaled to fit the supplied rectangle.

Overrides:

drawScaled in class Image

  public void loadData()

Begins the loading of the Bitmap's data. This method does not return until the data has been loaded, unless the Bitmap is set to be loaded incrementally. In general, you never call this method. Any methods requiring the Bitmap's data will automatically call loadData().

  public boolean hasLoadedData()

Returns true if the Bitmap attempted to load its data and succeeded.

See Also:

loadData

  public void setLoadsIncrementally(boolean flag)

Configures the Bitmap to load and display its data incrementally. An incrementally-loaded Bitmap notifies its update Target when additional data becomes available, and when drawn, draws all available data rather than waiting until all data is present.

See Also:

setUpdateTarget

  public boolean loadsIncrementally()

Returns true if the Bitmap's data will load incrementally.

See Also:

setLoadsIncrementally

  public synchronized Rect updateRect()

Returns the Rect defining the newly-available portion of an incrementally-loaded Bitmap. Returns an empty Rect if the Bitmap is not loading incrementally, or no additional data has become available since this method was most recently called.

See Also:

setLoadsIncrementally

  public synchronized void setUpdateTarget(Target aTarget)

Sets the Target that should receive a command when the incrementally-loaded Bitmap receives additional data.

See Also:

setLoadsIncrementally, setUpdateCommand

  public synchronized Target updateTarget()

Returns the Bitmap's update target.

See Also:

setUpdateTarget

  public synchronized void setUpdateCommand(String command)

Sets the command sent to an incrementally-loaded Bitmap's update Target when additional data becomes available.

See Also:

setUpdateTarget

  public synchronized String updateCommand()

Returns the Bitmap's update command.

See Also:

setUpdateCommand

  public boolean isValid()

Returns true if the Bitmap's data was successfully loaded and is valid.

See Also:

loadData

  public void flush()

Flushes all resources allocated to the Bitmap, including cached pixel data and system resources.

  public String toString()

Returns the Bitmap's String representation.

Overrides:

toString in class Object

  public void describeClassInfo(ClassInfo info)

Describes the Bitmap class' coding information.

Overrides:

describeClassInfo in class Image

See Also:

describeClassInfo

  public void encode(Encoder encoder) throws CodingException

Encodes the Bitmap. For now, Bitmaps are only encodable by name.

Overrides:

encode in class Image

See Also:

encode

  public void decode(Decoder decoder) throws CodingException

Decodes the Bitmap. For now, this simply decodes the name and calls Bitmap.bitmapNamed().

Overrides:

decode in class Image

See Also:

decode

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