/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package javax.microedition.lcdui;
import java.io.InputStream;
import java.io.IOException;
/**
* Creates ImageDate that is based on platform decoder and storage.
*/
interface AbstractImageDataFactory {
/**
* Creates a new, mutable image data for off-screen drawing. Every pixel
* within the newly created image is white. The width and height of the
* image must both be greater than zero.
*
* @param width the width of the new image, in pixels
* @param height the height of the new image, in pixels
* @return the created image data
*/
ImageData createOffScreenImageData(int width, int height);
/**
* Creates an immutable image data from a source mutable image data.
*
* <p> This method is useful for placing the contents of mutable images
* into <code>Choice</code> objects. The application can create
* an off-screen image
* using the
* {@link #createImage(int, int) createImage(w, h)}
* method, draw into it using a <code>Graphics</code> object
* obtained with the
* {@link #getGraphics() getGraphics()}
* method, and then create an immutable copy of it with this method.
* The immutable copy may then be placed into <code>Choice</code>
* objects. </p>
*
* @param mutableSource the source mutable image data to be copied
* @return the new immutable image data
*/
ImageData createImmutableCopy(ImageData mutableSource);
/**
* Creates an immutable image data from decoded image data obtained
* from the
* named resource. The name parameter is a resource name as defined by
* {@link Class#getResourceAsStream(String)
* Class.getResourceAsStream(name)}. The rules for resolving resource
* names are defined in the
* <a href="../../../java/lang/package-summary.html">
* Application Resource Files</a> section of the
* <code>java.lang</code> package documentation.
*
* @param name the name of the resource containing the image data in one of
* the supported image formats
* @return the created image data
* @throws java.io.IOException if the resource does not exist,
* the data cannot be loaded, or the image data cannot be decoded
*/
ImageData createResourceImageData(String name) throws IOException;
/**
* Creates an immutable image data which is decoded from the data stored in
* the specified byte array at the specified offset and length. The data
* must be in a self-identifying image file format supported by the
* implementation, such as <a href="#PNG">PNG</A>.
*
* <p>The <code>imageoffset</code> and <code>imagelength</code>
* parameters specify a range of
* data within the <code>imageData</code> byte array. The
* <code>imageOffset</code> parameter
* specifies the
* offset into the array of the first data byte to be used. It must
* therefore lie within the range
* <code>[0..(imageData.length-1)]</code>. The
* <code>imageLength</code>
* parameter specifies the number of data bytes to be used. It must be a
* positive integer and it must not cause the range to extend beyond
* the end
* of the array. That is, it must be true that
* <code>imageOffset + imageLength < imageData.length</code>. </p>
*
* <p> This method is intended for use when loading an
* image from a variety of sources, such as from
* persistent storage or from the network.</p>
*
* @param imageData the array of image data in a supported image format
* @param imageOffset the offset of the start of the data in the array
* @param imageLength the length of the data in the array
*
* @return the created image data
* @throws IllegalArgumentException if <code>imageData</code> is incorrectly
* formatted or otherwise cannot be decoded
*/
ImageData createImmutableImageData(byte[] imageData,
int imageOffset,
int imageLength);
/**
* Creates an immutable image data using pixel data from the specified
* region of a source image data, transformed as specified.
*
* <p>The source image may be mutable or immutable. For immutable source
* images, transparency information, if any, is copied to the new
* image unchanged.</p>
*
* <p>On some devices, pre-transformed images may render more quickly
* than images that are transformed on the fly using
* <code>drawRegion</code>.
* However, creating such images does consume additional heap space,
* so this technique should be applied only to images whose rendering
* speed is critical.</p>
*
* <p>The transform function used must be one of the following, as defined
* in the {@link javax.microedition.lcdui.game.Sprite Sprite} class:<br>
*
* <code>Sprite.TRANS_NONE</code> - causes the specified image
* region to be copied unchanged<br>
* <code>Sprite.TRANS_ROT90</code> - causes the specified image
* region to be rotated clockwise by 90 degrees.<br>
* <code>Sprite.TRANS_ROT180</code> - causes the specified image
* region to be rotated clockwise by 180 degrees.<br>
* <code>Sprite.TRANS_ROT270</code> - causes the specified image
* region to be rotated clockwise by 270 degrees.<br>
* <code>Sprite.TRANS_MIRROR</code> - causes the specified image
* region to be reflected about its vertical center.<br>
* <code>Sprite.TRANS_MIRROR_ROT90</code> - causes the specified image
* region to be reflected about its vertical center and then rotated
* clockwise by 90 degrees.<br>
* <code>Sprite.TRANS_MIRROR_ROT180</code> - causes the specified image
* region to be reflected about its vertical center and then rotated
* clockwise by 180 degrees.<br>
* <code>Sprite.TRANS_MIRROR_ROT270</code> - causes the specified image
* region to be reflected about its vertical center and then rotated
* clockwise by 270 degrees.<br></p>
*
* <p>
* The size of the returned image will be the size of the specified region
* with the transform applied. For example, if the region is
* <code>100 x 50</code> pixels and the transform is
* <code>TRANS_ROT90</code>, the
* returned image will be <code>50 x 100</code> pixels.</p>
*
* <p><strong>Note:</strong> If all of the following conditions
* are met, this method may
* simply return the source <code>Image</code> without creating a
* new one:</p>
* <ul>
* <li>the source image is immutable;</li>
* <li>the region represents the entire source image; and</li>
* <li>the transform is <code>TRANS_NONE</code>.</li>
* </ul>
*
* @param imageData the source image data to be copied from
* @param x the horizontal location of the region to be copied
* @param y the vertical location of the region to be copied
* @param width the width of the region to be copied
* @param height the height of the region to be copied
* @param transform the transform to be applied to the region
* @return the new immutable image data
*
*/
ImageData createImmutableImageData(ImageData imageData,
int x, int y,
int width, int height,
int transform);
/**
* Creates an immutable image data from decoded image data obtained from an
* <code>InputStream</code>. This method blocks until all image data has
* been read and decoded. After this method completes (whether by
* returning or by throwing an exception) the stream is left open and its
* current position is undefined.
*
* @param stream the name of the resource containing the image data
* in one of the supported image formats
*
* @return the created image data
* @throws java.io.IOException if an I/O error occurs, if the image data
* cannot be loaded, or if the image data cannot be decoded
*
*/
ImageData createImmutableImageData(InputStream stream) throws IOException;
/**
* Creates an immutable image data from a sequence of ARGB values,
* specified
* as <code>0xAARRGGBB</code>.
* The ARGB data within the <code>rgb</code> array is arranged
* horizontally from left to right within each row,
* row by row from top to bottom.
* If <code>processAlpha</code> is <code>true</code>,
* the high-order byte specifies opacity; that is,
* <code>0x00RRGGBB</code> specifies
* a fully transparent pixel and <code>0xFFRRGGBB</code> specifies
* a fully opaque
* pixel. Intermediate alpha values specify semitransparency. If the
* implementation does not support alpha blending for image rendering
* operations, it must replace any semitransparent pixels with fully
* transparent pixels. (See <a href="#alpha">Alpha Processing</a>
* for further discussion.) If <code>processAlpha</code> is
* <code>false</code>, the alpha values
* are ignored and all pixels must be treated as fully opaque.
*
* <p>Consider <code>P(a,b)</code> to be the value of the pixel
* located at column <code>a</code> and row <code>b</code> of the
* Image, where rows and columns are numbered downward from the
* top starting at zero, and columns are numbered rightward from
* the left starting at zero. This operation can then be defined
* as:</p>
*
* <TABLE BORDER="2">
* <TR>
* <TD ROWSPAN="1" COLSPAN="1">
* <pre><code>
* P(a, b) = rgb[a + b * width]; </code></pre>
* </TD>
* </TR>
* </TABLE>
* <p>for</p>
*
* <TABLE BORDER="2">
* <TR>
* <TD ROWSPAN="1" COLSPAN="1">
* <pre><code>
* 0 <= a < width
* 0 <= b < height </code></pre>
* </TD>
* </TR>
* </TABLE>
* <p> </p>
*
* @param rgb an array of ARGB values that composes the image
* @param width the width of the image
* @param height the height of the image
* @param processAlpha <code>true</code> if <code>rgb</code>
* has an alpha channel,
* <code>false</code> if all pixels are fully opaque
* @return the created immutable image data
*/
ImageData createImmutableImageData(int rgb[],
int width,
int height,
boolean processAlpha);
/**
* Create a immutable image from romized image data.
*
* @param imageDataArrayPtr native pointer to image data as Java int
* @param imageDataArrayLength length of image data array
* @throws IllegalArgumentException if the id is invalid
* @return the created image data
*/
ImageData createImmutableImageData(int imageDataArrayPtr,
int imageDataArrayLength);
}
|
