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);
}
// If it is determined that the image and block have no alpha component, then we compress with DXT1 using a
// four color palette. Otherwise, we use the three color palette (with the fourth color as transparent black).
ColorBlock4x4 colorBlock = new ColorBlock4x4();
ColorBlockExtractor colorBlockExtractor = this.getColorBlockExtractor(image);
BlockDXT1 dxt1Block = new BlockDXT1();
BlockDXT1Compressor dxt1Compressor = new BlockDXT1Compressor();
int width = image.getWidth();
int height = image.getHeight();
bool imageHasAlpha = image.getColorModel().hasAlpha();
bool enableAlpha = attributes.isEnableDXT1Alpha();
int alphaThreshold = attributes.getDXT1AlphaThreshold();
for (int j = 0; j < height; j += 4)
{
for (int i = 0; i < width; i += 4)
{
colorBlockExtractor.extractColorBlock4x4(attributes, i, j, colorBlock);
if (enableAlpha && imageHasAlpha && blockHasDXT1Alpha(colorBlock, alphaThreshold))
{
dxt1Compressor.compressBlockDXT1a(colorBlock, attributes, dxt1Block);
}
else
{
dxt1Compressor.compressBlockDXT1(colorBlock, attributes, dxt1Block);
}
buffer.putShort((short)dxt1Block.color0);
buffer.putShort((short)dxt1Block.color1);
buffer.putInt((int)dxt1Block.colorIndexMask);
}
}
}
/**
* Creates a new DXT2/DXT3 block compressor.
*/
public BlockDXT3Compressor()
{
this.dxt1Compressor = new BlockDXT1Compressor();
}
