image.java

有关对pdf操作的代码

	 * @param transparency
	 *            transparency information in the Mask format of the image
	 *            dictionary
	 * @return an object of type <CODE>ImgRaw</CODE>
	 * @throws BadElementException
	 *             on error
	 */
	public static Image getInstance(int width, int height, int components,
			int bpc, byte data[], int transparency[])
			throws BadElementException {
		if (transparency != null && transparency.length != components * 2)
			throw new BadElementException(
					"Transparency length must be equal to (componentes * 2)");
		if (components == 1 && bpc == 1) {
			byte g4[] = CCITTG4Encoder.compress(data, width, height);
			return Image.getInstance(width, height, false, Image.CCITTG4,
					Image.CCITT_BLACKIS1, g4, transparency);
		}
		Image img = new ImgRaw(width, height, components, bpc, data);
		img.transparency = transparency;
		return img;
	}

	// images from a PdfTemplate
	
	/**
	 * gets an instance of an Image
	 * 
	 * @param template
	 *            a PdfTemplate that has to be wrapped in an Image object
	 * @return an Image object
	 * @throws BadElementException
	 */
	public static Image getInstance(PdfTemplate template)
			throws BadElementException {
		return new ImgTemplate(template);
	}
    
    // images from a java.awt.Image
    
	/**
	 * Gets an instance of an Image from a java.awt.Image.
	 * 
	 * @param image
	 *            the <CODE>java.awt.Image</CODE> to convert
	 * @param color
	 *            if different from <CODE>null</CODE> the transparency pixels
	 *            are replaced by this color
	 * @param forceBW
	 *            if <CODE>true</CODE> the image is treated as black and white
	 * @return an object of type <CODE>ImgRaw</CODE>
	 * @throws BadElementException
	 *             on error
	 * @throws IOException
	 *             on error
	 */
	public static Image getInstance(java.awt.Image image, java.awt.Color color,
			boolean forceBW) throws BadElementException, IOException {
		
		if(image instanceof BufferedImage){
			BufferedImage bi = (BufferedImage) image;
			if(bi.getType()==BufferedImage.TYPE_BYTE_BINARY) {
				forceBW=true;
			}
		}
		
		java.awt.image.PixelGrabber pg = new java.awt.image.PixelGrabber(image,
				0, 0, -1, -1, true);
		try {
			pg.grabPixels();
		} catch (InterruptedException e) {
			throw new IOException(
					"java.awt.Image Interrupted waiting for pixels!");
		}
		if ((pg.getStatus() & java.awt.image.ImageObserver.ABORT) != 0) {
			throw new IOException("java.awt.Image fetch aborted or errored");
		}
		int w = pg.getWidth();
		int h = pg.getHeight();
		int[] pixels = (int[]) pg.getPixels();
		if (forceBW) {
			int byteWidth = (w / 8) + ((w & 7) != 0 ? 1 : 0);
			byte[] pixelsByte = new byte[byteWidth * h];

			int index = 0;
			int size = h * w;
			int transColor = 1;
			if (color != null) {
				transColor = (color.getRed() + color.getGreen()
						+ color.getBlue() < 384) ? 0 : 1;
			}
			int transparency[] = null;
			int cbyte = 0x80;
			int wMarker = 0;
			int currByte = 0;
			if (color != null) {
				for (int j = 0; j < size; j++) {
					int alpha = (pixels[j] >> 24) & 0xff;
					if (alpha < 250) {
						if (transColor == 1)
							currByte |= cbyte;
					} else {
						if ((pixels[j] & 0x888) != 0)
							currByte |= cbyte;
					}
					cbyte >>= 1;
					if (cbyte == 0 || wMarker + 1 >= w) {
						pixelsByte[index++] = (byte) currByte;
						cbyte = 0x80;
						currByte = 0;
					}
					++wMarker;
					if (wMarker >= w)
						wMarker = 0;
				}
			} else {
				for (int j = 0; j < size; j++) {
					if (transparency == null) {
						int alpha = (pixels[j] >> 24) & 0xff;
						if (alpha == 0) {
							transparency = new int[2];
							transparency[0] = transparency[1] = ((pixels[j] & 0x888) != 0) ? 1
									: 0;
						}
					}
					if ((pixels[j] & 0x888) != 0)
						currByte |= cbyte;
					cbyte >>= 1;
					if (cbyte == 0 || wMarker + 1 >= w) {
						pixelsByte[index++] = (byte) currByte;
						cbyte = 0x80;
						currByte = 0;
					}
					++wMarker;
					if (wMarker >= w)
						wMarker = 0;
				}
			}
			return Image.getInstance(w, h, 1, 1, pixelsByte, transparency);
		} else {
			byte[] pixelsByte = new byte[w * h * 3];
			byte[] smask = null;

			int index = 0;
			int size = h * w;
			int red = 255;
			int green = 255;
			int blue = 255;
			if (color != null) {
				red = color.getRed();
				green = color.getGreen();
				blue = color.getBlue();
			}
			int transparency[] = null;
			if (color != null) {
				for (int j = 0; j < size; j++) {
					int alpha = (pixels[j] >> 24) & 0xff;
					if (alpha < 250) {
						pixelsByte[index++] = (byte) red;
						pixelsByte[index++] = (byte) green;
						pixelsByte[index++] = (byte) blue;
					} else {
						pixelsByte[index++] = (byte) ((pixels[j] >> 16) & 0xff);
						pixelsByte[index++] = (byte) ((pixels[j] >> 8) & 0xff);
						pixelsByte[index++] = (byte) ((pixels[j]) & 0xff);
					}
				}
			} else {
				int transparentPixel = 0;
				smask = new byte[w * h];
				boolean shades = false;
				for (int j = 0; j < size; j++) {
					byte alpha = smask[j] = (byte) ((pixels[j] >> 24) & 0xff);
					/* bugfix by Chris Nokleberg */
					if (!shades) {
						if (alpha != 0 && alpha != -1) {
							shades = true;
						} else if (transparency == null) {
							if (alpha == 0) {
								transparentPixel = pixels[j] & 0xffffff;
								transparency = new int[6];
								transparency[0] = transparency[1] = (transparentPixel >> 16) & 0xff;
								transparency[2] = transparency[3] = (transparentPixel >> 8) & 0xff;
								transparency[4] = transparency[5] = transparentPixel & 0xff;
							}
						} else if ((pixels[j] & 0xffffff) != transparentPixel) {
							shades = true;
						}
					}
					pixelsByte[index++] = (byte) ((pixels[j] >> 16) & 0xff);
					pixelsByte[index++] = (byte) ((pixels[j] >> 8) & 0xff);
					pixelsByte[index++] = (byte) ((pixels[j]) & 0xff);
				}
				if (shades)
					transparency = null;
				else
					smask = null;
			}
			Image img = Image.getInstance(w, h, 3, 8, pixelsByte, transparency);
			if (smask != null) {
				Image sm = Image.getInstance(w, h, 1, 8, smask);
				try {
					sm.makeMask();
					img.setImageMask(sm);
				} catch (DocumentException de) {
					throw new ExceptionConverter(de);
				}
			}
			return img;
		}
	}

	/**
	 * Gets an instance of an Image from a java.awt.Image.
	 * 
	 * @param image
	 *            the <CODE>java.awt.Image</CODE> to convert
	 * @param color
	 *            if different from <CODE>null</CODE> the transparency pixels
	 *            are replaced by this color
	 * @return an object of type <CODE>ImgRaw</CODE>
	 * @throws BadElementException
	 *             on error
	 * @throws IOException
	 *             on error
	 */
	public static Image getInstance(java.awt.Image image, java.awt.Color color)
			throws BadElementException, IOException {
		return Image.getInstance(image, color, false);
	}
	
	/**
	 * Gets an instance of a Image from a java.awt.Image.
	 * The image is added as a JPEG with a user defined quality.
	 * 
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> object to which the image will be added
	 * @param awtImage
	 *            the <CODE>java.awt.Image</CODE> to convert
	 * @param quality
	 *            a float value between 0 and 1
	 * @return an object of type <CODE>PdfTemplate</CODE>
	 * @throws BadElementException
	 *             on error
	 * @throws IOException
	 */
	public static Image getInstance(PdfWriter writer, java.awt.Image awtImage, float quality) throws BadElementException, IOException {
		return getInstance(new PdfContentByte(writer), awtImage, quality);
	}
	
    /**
     * Gets an instance of a Image from a java.awt.Image.
     * The image is added as a JPEG with a user defined quality.
     *
     * @param cb
     *            the <CODE>PdfContentByte</CODE> object to which the image will be added
     * @param awtImage
     *            the <CODE>java.awt.Image</CODE> to convert
     * @param quality
     *            a float value between 0 and 1
     * @return an object of type <CODE>PdfTemplate</CODE>
     * @throws BadElementException
     *             on error
     * @throws IOException
     */
    public static Image getInstance(PdfContentByte cb, java.awt.Image awtImage, float quality) throws BadElementException, IOException {
        java.awt.image.PixelGrabber pg = new java.awt.image.PixelGrabber(awtImage,
                0, 0, -1, -1, true);
        try {
            pg.grabPixels();
        } catch (InterruptedException e) {
            throw new IOException(
                    "java.awt.Image Interrupted waiting for pixels!");
        }
        if ((pg.getStatus() & java.awt.image.ImageObserver.ABORT) != 0) {
            throw new IOException("java.awt.Image fetch aborted or errored");
        }
        int w = pg.getWidth();
        int h = pg.getHeight();
        PdfTemplate tp = cb.createTemplate(w, h);
        Graphics2D g2d = tp.createGraphics(w, h, true, quality);
        g2d.drawImage(awtImage, 0, 0, null);
        g2d.dispose();
        return getInstance(tp);
    }

    // image from indirect reference
    
    /**
     * Holds value of property directReference.
     * An image is embedded into a PDF as an Image XObject.
     * This object is referenced by a PdfIndirectReference object.
     */
    private PdfIndirectReference directReference;
    
    /**
     * Getter for property directReference.
     * @return Value of property directReference.
     */
    public PdfIndirectReference getDirectReference() {
        return this.directReference;
    }
    
    /**
     * Setter for property directReference.
     * @param directReference New value of property directReference.
     */
    public void setDirectReference(PdfIndirectReference directReference) {
        this.directReference = directReference;
    }
    
    /**
     * Reuses an existing image.
     * @param ref the reference to the image dictionary
     * @throws BadElementException on error
     * @return the image
     */    
    public static Image getInstance(PRIndirectReference ref) throws BadElementException {
        PdfDictionary dic = (PdfDictionary)PdfReader.getPdfObjectRelease(ref);
        int width = ((PdfNumber)PdfReader.getPdfObjectRelease(dic.get(PdfName.WIDTH))).intValue();
        int height = ((PdfNumber)PdfReader.getPdfObjectRelease(dic.get(PdfName.HEIGHT))).intValue();
        Image imask = null;
        PdfObject obj = dic.get(PdfName.SMASK);
        if (obj != null && obj.isIndirect()) {
            imask = getInstance((PRIndirectReference)obj);
        }
        else {
            obj = dic.get(PdfName.MASK);
            if (obj != null && obj.isIndirect()) {
                PdfObject obj2 = PdfReader.getPdfObjectRelease(obj);
                if (obj2 instanceof PdfDictionary)
                    imask = getInstance((PRIndirectReference)obj);
            }
        }
        Image img = new ImgRaw(width, height, 1, 1, null);
        img.imageMask = imask;
        img.directReference = ref;
        return img;
    }

    // copy constructor
    
	/**
	 * Constructs an <CODE>Image</CODE> -object, using an <VAR>url </VAR>.
	 * 
	 * @param image
	 *            another Image object.
	 */
	protected Image(Image image) {
		super(image);
		this.type = image.type;
		this.url = image.url;
		this.rawData = image.rawData;
		this.bpc = image.bpc;
		this.template = image.template;
		this.alignment = image.alignment;
		this.alt = image.alt;
		this.absoluteX = image.absoluteX;
		this.absoluteY = image.absoluteY;
		this.plainWidth = image.plainWidth;
		this.plainHeight = image.plainHeight;
		this.scaledWidth = image.scaledWidth;
		this.scaledHeight = image.scaledHeight;
		this.mySerialId = image.mySerialId;

        this.directReference = image.directReference;
        
		this.rotationRadians = image.rotationRadians;
        this.initialRotation = image.initialRotation;
        this.indentationLeft = image.indentationLeft;
        this.indentationRight = image.indentationRight;
		this.spacingBefore = image.spacingBefore;
		this.spacingAfter = image.spacingAfter;

		this.widthPercentage = image.widthPercentage;
		this.annotation = image.annotation;
		this.layer = image.layer;
		this.interpolation = image.interpolation;
		this.originalType = image.originalType;
		this.originalData = image.originalData;
		this.deflated = image.deflated;
		this.dpiX = image.dpiX;
		this.dpiY = image.dpiY;
		this.XYRatio = image.XYRatio;
		
		this.colorspace = image.colorspace;
		this.invert = image.invert;
		this.profile = image.profile;
		this.additional = image.additional;
		this.mask = image.mask;
		this.imageMask = image.imageMask;
		this.smask = image.smask;
		this.transparency = image.transparency;
	}

	/**
	 * gets an instance of an Image
	 * 
	 * @param image
	 *            an Image object
	 * @return a new Image object
	 */
	public static Image getInstance(Image image) {
		if (image == null)
			return null;
		try {
			Class cs = image.getClass();
			Constructor constructor = cs
					.getDeclaredConstructor(new Class[] { Image.class });
			return (Image) constructor.newInstance(new Object[] { image });
		} catch (Exception e) {
			throw new ExceptionConverter(e);
		}
	}

	// implementation of the Element interface
	
	/**
	 * Returns the type.
	 * 
	 * @return a type
	 */

	public int type() {
		return type;
	}

	/**
	 * @see com.lowagie.text.Element#isNestable()
	 * @since	iText 2.0.8
	 */
	public boolean isNestable() {
		return true;
	}

	// checking the type of Image

	/**
	 * Returns <CODE>true</CODE> if the image is a <CODE>Jpeg</CODE>
	 * -object.
	 * 
	 * @return a <CODE>boolean</CODE>
	 */

	public boolean isJpeg() {
		return type == JPEG;
	}

	/**
	 * Returns <CODE>true</CODE> if the image is a <CODE>ImgRaw</CODE>
	 * -object.
	 * 
	 * @return a <CODE>boolean</CODE>
	 */

	public boolean isImgRaw() {
		return type == IMGRAW;
	}

	/**
	 * Returns <CODE>true</CODE> if the image is an <CODE>ImgTemplate</CODE>
	 * -object.
	 * 
	 * @return a <CODE>boolean</CODE>
	 */

	public boolean isImgTemplate() {
		return type == IMGTEMPLATE;
	}
	
	// getters and setters

	/**
	 * Gets the <CODE>String</CODE> -representation of the reference to the
	 * image.
	 * 
	 * @return a <CODE>String</CODE>
	 */

	public URL getUrl() {
		return url;
	}

	/**
	 * Sets the url of the image