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World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.
/*
* Copyright (C) 2012 United States Government as represented by the Administrator of the
* National Aeronautics and Space Administration.
* All Rights Reserved.
*/
package gov.nasa.worldwind.data;
import gov.nasa.worldwind.geom.Sector;
import gov.nasa.worldwind.util.*;
/**
* @author dcollins
* @version $Id: MipMappedBufferedImageRaster.java 1171 2013-02-11 21:45:02Z dcollins $
*/
public class MipMappedBufferedImageRaster extends BufferedImageRaster
{
protected BufferedImageRaster[] levelRasters;
/**
* Creates a mipmapped version of a BufferedImageRaster from a single BufferedImage instance.
*
* @param sector A sector
* @param image BufferedImage
*/
public MipMappedBufferedImageRaster(Sector sector, java.awt.image.BufferedImage image)
{
super(sector, image);
int maxLevel = ImageUtil.getMaxMipmapLevel(image.getWidth(), image.getHeight());
java.awt.image.BufferedImage[] levelImages = ImageUtil.buildMipmaps(image,
java.awt.image.BufferedImage.TYPE_INT_ARGB_PRE, maxLevel);
this.levelRasters = new BufferedImageRaster[1 + maxLevel];
for (int i = 0; i <= maxLevel; i++)
{
this.levelRasters[i] = new BufferedImageRaster(sector, levelImages[i]);
}
}
/**
* Creates a mipmapped version of a BufferedImageRaster from multi-resolution array od BufferedImage instances.
*
* @param sector A sector
* @param images An array of BufferedImages
*/
public MipMappedBufferedImageRaster(Sector sector, java.awt.image.BufferedImage[] images)
{
super(sector, (null != images && images.length > 0) ? images[0] : null);
if (null == sector)
{
String message = Logging.getMessage("nullValue.SectorIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (null == images || images.length == 0)
{
String message = Logging.getMessage("nullValue.ArrayIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.levelRasters = new BufferedImageRaster[images.length];
for (int i = 0; i < images.length; i++)
{
this.levelRasters[i] = new BufferedImageRaster(sector, images[i]);
}
}
public long getSizeInBytes()
{
long sizeInBytes = 0L;
for (BufferedImageRaster raster : this.levelRasters)
{
sizeInBytes += raster.getSizeInBytes();
}
return sizeInBytes;
}
public void dispose()
{
for (BufferedImageRaster raster : this.levelRasters)
{
raster.dispose();
}
}
protected void doDrawOnTo(BufferedImageRaster canvas)
{
if (!this.getSector().intersects(canvas.getSector()))
{
return;
}
BufferedImageRaster raster = this.chooseRasterForCanvas(canvas);
raster.doDrawOnTo(canvas);
}
protected BufferedImageRaster chooseRasterForCanvas(BufferedImageRaster canvas)
{
int level = this.computeMipmapLevel(
this.getWidth(), this.getHeight(), this.getSector(),
canvas.getWidth(), canvas.getHeight(), canvas.getSector());
int maxLevel = this.levelRasters.length - 1;
level = (int) WWMath.clamp(level, 0, maxLevel);
return this.levelRasters[level];
}
protected int computeMipmapLevel(int sourceWidth, int sourceHeight, Sector sourceSector,
int destWidth, int destHeight, Sector destSector)
{
double sy = ((double) sourceHeight / (double) destHeight)
* (destSector.getDeltaLatDegrees() / sourceSector.getDeltaLatDegrees());
double sx = ((double) sourceWidth / (double) destWidth)
* (destSector.getDeltaLonDegrees() / sourceSector.getDeltaLonDegrees());
double scale = Math.max(sx, sy);
if (scale < 1)
{
return 0;
}
return (int) WWMath.logBase2(scale);
}
}