/// <summary>
/// Get a thumbnail of the document, if possible
/// </summary>
/// <param name="sizeX">The maximum X size of the thumbnail</param>
/// <param name="sizeY">The maximum y size of the thumbnail</param>
/// <param name="forceFullSize">True if the thumbnail should be exatly XxY pixels and False if the thumbnail
/// should fit inside a XxY box but should maintain its aspect ratio</param>
/// <returns>A JPEG byte thumbnail or null if the thumbnail can´t be generated</returns>
public override byte[] GetThumbnail(int sizeX, int sizeY, bool forceFullSize)
{
// If we have no bytes then we can't do anything.
if (Bytes == null || Bytes.Length == 0)
{
return(null);
}
try
{
org.pdfbox.pdfviewer.PageDrawer pagedrawer = new
org.pdfbox.pdfviewer.PageDrawer();
java.io.ByteArrayInputStream byteStream = new java.io.ByteArrayInputStream(Bytes);
PDDocument doc = PDDocument.load(byteStream);
int count = doc.getNumberOfPages();
java.util.List pages = doc.getDocumentCatalog().getAllPages();
if (pages.size() > 0)
{
PDPage page = pagedrawer.getPage();
java.awt.image.BufferedImage image = page.convertToImage();
java.io.ByteArrayOutputStream os = new java.io.ByteArrayOutputStream();
ImageIO.write(image, "jpg", os);
byte[] data = os.toByteArray();
return(data);
}
}
catch (Exception e)
{
log.Error("Failed to get the thumbnail from the PDF file " + Name, e);
}
return(null);
}
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 <code>BasicColorBlockExtrator</code> which will draw its data from the <code>BufferedImage</code>.
* The <code>BufferedImage</code> may be of any type, so long as a call to <code>image.getRGB()</code> will
* succeed.
*
* @param image the image to draw data from.
*
* @throws ArgumentException if <code>image</code> is null.
*/
public BasicColorBlockExtractor(java.awt.image.BufferedImage image)
{
if (image == null)
{
String message = Logging.getMessage("nullValue.ImageIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
this.width = image.getWidth();
this.height = image.getHeight();
this.image = image;
this.buffer = new int[16];
}
/**
* 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)
{
base(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]);
}
}
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);
}
}
}
public int getCompressedSize(java.awt.image.BufferedImage image, DXTCompressionAttributes attributes)
{
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);
}
// TODO: comment, provide documentation reference
int width = Math.Max(image.getWidth(), 4);
int height = Math.Max(image.getHeight(), 4);
return((width * height) / 2);
}
protected ColorBlockExtractor getColorBlockExtractor(java.awt.image.BufferedImage image)
{
return(new BasicColorBlockExtractor(image));
}
