blockdxt3.java

来自「world wind java sdk 源码」· Java 代码 · 共 80 行

/* Copyright (C) 2001, 2008 United States Government as represented by
the Administrator of the National Aeronautics and Space Administration.
All Rights Reserved.
*/
package gov.nasa.worldwind.formats.dds;

/**
 * <code>BlockDXT3</code> is a data structure representing the compressed alpha and color values in a single DXT2/DXT3
 * block. The DXT3 block contains a 64 bit alpha block, and a 64 bit color block, stored here as the properties
 * <code>alphaBlock</code> and </code>colorBlock</code>. The 64 bit alpha block contains 4x4 alpha values quantized
 * into 4 bits. The 64 bit color block is formatted exactly like the DXT1 color block, except that the color block
 * always represents four colors, regardless of the color ordering in the DXT1 block.
 *
 * @see AlphaBlockDXT3
 * @see BlockDXT1
 * 
 * @author dcollins
 * @version $Id: BlockDXT3.java 8856 2009-02-14 00:51:20Z dcollins $
 */
public class BlockDXT3
{
    /**
     * The DXT2/DXT3 alpha block.
     */
    public AlphaBlockDXT3 alphaBlock;
    /**
     * The DXT1 color block.
     */
    public BlockDXT1 colorBlock;

    /**
     * Creates a new DXT2/DXT3 alpha block with all alpha and color values set to 0.
     */
    public BlockDXT3()
    {
        this.alphaBlock = new AlphaBlockDXT3();
        this.colorBlock = new BlockDXT1();
    }

    /**
     * Returns the DXT2/DXT3 alpha block.
     *
     * @return DXT2/DXT3 alpha block.
     */
    public AlphaBlockDXT3 getAlphaBlock()
    {
        return this.alphaBlock;
    }

    /**
     * Sets the DXT2/DXT3 alpha block.
     *
     * @param alphaBlock DXT2/DXT3 alpha block.
     */
    public void setAlphaBlock(AlphaBlockDXT3 alphaBlock)
    {
        this.alphaBlock = alphaBlock;
    }

    /**
     * Returns the DXT1 color block.
     *
     * @return DXT1 color block.
     */
    public BlockDXT1 getColorBlock()
    {
        return this.colorBlock;
    }

    /**
     * Sets the DXT1 color block.
     *
     * @param colorBlock DXT1 color block.
     */
    public void setColorBlock(BlockDXT1 colorBlock)
    {
        this.colorBlock = colorBlock;
    }
}