/*
*
*
* 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;
/**
* AbstractImageData implementation based
* on putpixel graphics library and stores data on Java heap.
*/
final class ImageData implements AbstractImageData {
/**
* The width, height of this Image
*/
private int width, height;
/**
* If this Image is mutable.
*/
private boolean isMutable;
/**
* Image pixel data byte array.
* If this is null, use nativePixelData and nativeAlphaData instead.
*/
private byte[] pixelData;
/**
* Image alpha data byte array.
* If pixelData is null, use nativePixelData instead.
*/
private byte[] alphaData;
/**
* Image native romized pixel data.
* Set in native by loadRomizedImage().
* Must remain 0 unless pixelData is null.
*/
private int nativePixelData;
/**
* Image native romized alpha data.
* Set in native by loadRomizedImage().
* Must remain 0 unless pixelData is null.
*/
private int nativeAlphaData;
/**
* Constructs empty <code>ImageData </code>.
*/
ImageData() {}
/**
* Constructs <code>ImageData </code> using passed in width and height.
* Alpha array is allocated if allocateAlpha is true.
*
* @param width The width of the <code>ImageData </code> to be created.
* @param height The height of the <code>ImageData </code> to be created.
* @param isMutable true to create mutable <code>ImageData</code>,
* false to create immutable <code>ImageData</code>
* @param clearPixelData if true pixel data whould be set to 0xff for
* each pixel
* @param allocateAlpha true if alpha data should be allocated,
* false - if not.
*/
ImageData(int width, int height, boolean isMutable,
boolean clearPixelData,
boolean allocateAlpha) {
initImageData(width, height, isMutable, allocateAlpha);
if (clearPixelData) {
for (int i = 0; i < pixelData.length; i++) {
pixelData[i] = (byte)0xFF;
}
}
}
/**
* Constructs mutable or immutable <code> ImageData </code>
* using passed in width, height and pixel data.
*
* @param width The width of the <code>ImageData </code> to be created.
* @param height The height of the <code>ImageData </code> to be created.
* @param isMutable true to create mutable <code>ImageData</code>,
* false to create immutable <code>ImageData</code>
* @param pixelData byte array that contains pixel data for the
* <code>ImageData</code>.
*/
ImageData(int width, int height, boolean isMutable,
byte[] pixelData) {
this.width = width;
this.height = height;
this.isMutable = isMutable;
int length = width * height * 2;
byte[] newPixelData = new byte[length];
System.arraycopy(pixelData, 0, newPixelData, 0, length);
this.pixelData = newPixelData;
}
/**
* Initializes mutable or immutable <code> ImageData </code>
* using passed in width, height.
* Alpha array is allocated if allocateAlpha is true.
*
* @param width The width of the <code>ImageData </code> to be created.
* @param height The height of the <code>ImageData </code> to be created.
* @param isMutable true to create mutable <code>ImageData</code>,
* false to create immutable <code>ImageData</code>
* @param allocateAlpha true if alpha data should be allocated,
* false - if not.
*/
void initImageData(int width, int height, boolean isMutable,
boolean allocateAlpha) {
this.width = width;
this.height = height;
this.isMutable = isMutable;
pixelData = new byte[width * height * 2];
if (allocateAlpha) {
alphaData = new byte[width * height];
} else {
alphaData = null;
}
}
/**
* Gets the width of the image in pixels. The value returned
* must reflect the actual width of the image when rendered.
* @return width of the image
*/
public int getWidth() {
return width;
}
/**
* Gets the height of the image in pixels. The value returned
* must reflect the actual height of the image when rendered.
* @return height of the image
*/
public int getHeight() {
return height;
}
/**
* Check if this image is mutable. Mutable images can be modified by
* rendering to them through a <code>Graphics</code> object
* obtained from the
* <code>getGraphics()</code> method of this object.
* @return <code>true</code> if the image is mutable,
* <code>false</code> otherwise
*/
public boolean isMutable() {
return isMutable;
}
/**
* Returns true if <code>ImageData</code> contains alpha data.
*
* @return true if <code>ImageData</code> contains alpha data.
*/
public boolean hasAlpha() {
return (alphaData != null || nativeAlphaData != 0);
}
/**
* Removes alpha data information
*/
public void removeAlpha() {
alphaData = null;
}
/**
* Gets pixel data associated with this <code> ImageData</code> instance.
* @return byte arra that represents pixel data associated with this
* <code>ImageData</code> instance.
*/
byte[] getPixelData() {
return pixelData;
}
}
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