public void compressImage(java.awt.image.BufferedImage image, DXTCompressionAttributes attributes, java.nio.ByteBuffer buffer) { if (image == null) { String message = Logging.getMessage("nullValue.ImageIsNull"); Logging.logger().severe(message); throw new ArgumentException(message); } if (attributes == null) { String message = Logging.getMessage("nullValue.AttributesIsNull"); Logging.logger().severe(message); throw new ArgumentException(message); } if (buffer == null) { String message = Logging.getMessage("nullValue.BufferNull"); Logging.logger().severe(message); throw new ArgumentException(message); } ColorBlock4x4 colorBlock = new ColorBlock4x4(); ColorBlockExtractor colorBlockExtractor = this.getColorBlockExtractor(image); BlockDXT3 dxt3Block = new BlockDXT3(); BlockDXT3Compressor dxt3Compressor = new BlockDXT3Compressor(); int width = image.getWidth(); int height = image.getHeight(); for (int j = 0; j < height; j += 4) { for (int i = 0; i < width; i += 4) { colorBlockExtractor.extractColorBlock4x4(attributes, i, j, colorBlock); dxt3Compressor.compressBlockDXT3(colorBlock, attributes, dxt3Block); AlphaBlockDXT3 dxtAlphaBlock = dxt3Block.getAlphaBlock(); buffer.putLong(dxtAlphaBlock.alphaValueMask); BlockDXT1 dxtColorBlock = dxt3Block.getColorBlock(); buffer.putShort((short)dxtColorBlock.color0); buffer.putShort((short)dxtColorBlock.color1); buffer.putInt((int)dxtColorBlock.colorIndexMask); } } }
/** * Compress the 4x4 color block into a DXT2/DXT3 block using 16 4 bit alpha values, and four colors. This method * compresses the color block exactly as a DXT1 compressor, except that it guarantees that the DXT1 block will use * four colors. * <p/> * Access to this method must be synchronized by the caller. This method is frequently invoked by the DXT * compressor, so in order to reduce garbage each instance of this class has unsynchronized properties that are * reused during each call. * * @param colorBlock the 4x4 color block to compress. * @param attributes attributes that will control the compression. * @param dxtBlock the DXT2/DXT3 block that will receive the compressed data. * @throws ArgumentException if either <code>colorBlock</code> or <code>dxtBlock</code> are null. */ public void compressBlockDXT3(ColorBlock4x4 colorBlock, DXTCompressionAttributes attributes, BlockDXT3 dxtBlock) { if (colorBlock == null) { String message = Logging.getMessage("nullValue.ColorBlockIsNull"); Logging.logger().severe(message); throw new ArgumentException(message); } if (attributes == null) { String message = Logging.getMessage("nullValue.AttributesIsNull"); Logging.logger().severe(message); throw new ArgumentException(message); } if (dxtBlock == null) { String message = Logging.getMessage("nullValue.DXTBlockIsNull"); Logging.logger().severe(message); throw new ArgumentException(message); } // The DXT3 color block is compressed exactly like the DXT1 color block, except that the four color palette is // always used, no matter the ordering of color0 and color1. At this stage we only consider color values, // not alpha. this.dxt1Compressor.compressBlockDXT1(colorBlock, attributes, dxtBlock.colorBlock); // The DXT3 alpha block can be compressed separately. this.compressBlockDXT3a(colorBlock, dxtBlock.alphaBlock); }