gifimagemetadata.java

java1.6众多例子参考

                appExtNode.setAttribute("authenticationCode",
                                        toISO8859(authenticationCode));
                byte[] appData = (byte[])applicationData.get(i);
                appExtNode.setUserObject((byte[])appData.clone());
                node.appendChild(appExtNode);
            }

            root.appendChild(node);
        }

        // Comment extensions
        int numComments = comments == null ? 0 : comments.size();
        if (numComments > 0) {
            node = new IIOMetadataNode("CommentExtensions");
            for (int i = 0; i < numComments; i++) {
                IIOMetadataNode commentNode =
                    new IIOMetadataNode("CommentExtension");
                byte[] comment = (byte[])comments.get(i);
                commentNode.setAttribute("value", toISO8859(comment));
                node.appendChild(commentNode);
            }

            root.appendChild(node);
        }

        return root;
    }

    public IIOMetadataNode getStandardChromaNode() {
        IIOMetadataNode chroma_node = new IIOMetadataNode("Chroma");
        IIOMetadataNode node = null; // scratch node

        node = new IIOMetadataNode("ColorSpaceType");
        node.setAttribute("name", "RGB");
        chroma_node.appendChild(node);

        node = new IIOMetadataNode("NumChannels");
        node.setAttribute("value", transparentColorFlag ? "4" : "3");
        chroma_node.appendChild(node);

        // Gamma not in format

        node = new IIOMetadataNode("BlackIsZero");
        node.setAttribute("value", "TRUE");
        chroma_node.appendChild(node);

        if (localColorTable != null) {
            node = new IIOMetadataNode("Palette");
            int numEntries = localColorTable.length/3;
            for (int i = 0; i < numEntries; i++) {
                IIOMetadataNode entry =
                    new IIOMetadataNode("PaletteEntry");
                entry.setAttribute("index", Integer.toString(i));
                entry.setAttribute("red",
                           Integer.toString(localColorTable[3*i] & 0xff));
                entry.setAttribute("green",
                           Integer.toString(localColorTable[3*i + 1] & 0xff));
                entry.setAttribute("blue",
                           Integer.toString(localColorTable[3*i + 2] & 0xff));
                node.appendChild(entry);
            }
            chroma_node.appendChild(node);
        }

        // BackgroundIndex not in image
        // BackgroundColor not in format

        return chroma_node;
    }

    public IIOMetadataNode getStandardCompressionNode() {
        IIOMetadataNode compression_node = new IIOMetadataNode("Compression");
        IIOMetadataNode node = null; // scratch node

        node = new IIOMetadataNode("CompressionTypeName");
        node.setAttribute("value", "lzw");
        compression_node.appendChild(node);

        node = new IIOMetadataNode("Lossless");
        node.setAttribute("value", "TRUE");
        compression_node.appendChild(node);

        node = new IIOMetadataNode("NumProgressiveScans");
        node.setAttribute("value", interlaceFlag ? "4" : "1");
        compression_node.appendChild(node);

        // BitRate not in format

        return compression_node;
    }

    public IIOMetadataNode getStandardDataNode() {
        IIOMetadataNode data_node = new IIOMetadataNode("Data");
        IIOMetadataNode node = null; // scratch node

        // PlanarConfiguration not in format

        node = new IIOMetadataNode("SampleFormat");
        node.setAttribute("value", "Index");
        data_node.appendChild(node);

        // BitsPerSample not in image
        // SignificantBitsPerSample not in format
        // SampleMSB not in format
        
        return data_node;
    }

    public IIOMetadataNode getStandardDimensionNode() {
        IIOMetadataNode dimension_node = new IIOMetadataNode("Dimension");
        IIOMetadataNode node = null; // scratch node

        // PixelAspectRatio not in image

        node = new IIOMetadataNode("ImageOrientation");
        node.setAttribute("value", "Normal");
        dimension_node.appendChild(node);

        // HorizontalPixelSize not in format
        // VerticalPixelSize not in format
        // HorizontalPhysicalPixelSpacing not in format
        // VerticalPhysicalPixelSpacing not in format
        // HorizontalPosition not in format
        // VerticalPosition not in format

        node = new IIOMetadataNode("HorizontalPixelOffset");
        node.setAttribute("value", Integer.toString(imageLeftPosition));
        dimension_node.appendChild(node);

        node = new IIOMetadataNode("VerticalPixelOffset");
        node.setAttribute("value", Integer.toString(imageTopPosition));
        dimension_node.appendChild(node);

        // HorizontalScreenSize not in image
        // VerticalScreenSize not in image

        return dimension_node;
    }

    // Document not in image

    public IIOMetadataNode getStandardTextNode() {
        if (comments == null) {
            return null;
        }
        Iterator commentIter = comments.iterator();
        if (!commentIter.hasNext()) {
            return null;
        }

        IIOMetadataNode text_node = new IIOMetadataNode("Text");
        IIOMetadataNode node = null; // scratch node
        
        while (commentIter.hasNext()) {
            byte[] comment = (byte[])commentIter.next();
            String s = null;
            try {
                s = new String(comment, "ISO-8859-1");
            } catch (UnsupportedEncodingException e) {
                throw new RuntimeException("Encoding ISO-8859-1 unknown!");
            }

            node = new IIOMetadataNode("TextEntry");
            node.setAttribute("value", s);
            node.setAttribute("encoding", "ISO-8859-1");
            node.setAttribute("compression", "none");
            text_node.appendChild(node);
        }

        return text_node;
    }

    public IIOMetadataNode getStandardTransparencyNode() {
        if (!transparentColorFlag) {
            return null;
        }
        
        IIOMetadataNode transparency_node =
            new IIOMetadataNode("Transparency");
        IIOMetadataNode node = null; // scratch node

        // Alpha not in format

        node = new IIOMetadataNode("TransparentIndex");
        node.setAttribute("value",
                          Integer.toString(transparentColorIndex));
        transparency_node.appendChild(node);

        // TransparentColor not in format
        // TileTransparencies not in format
        // TileOpacities not in format

        return transparency_node;
    }

    public void setFromTree(String formatName, Node root) 
        throws IIOInvalidTreeException
    {
        throw new IllegalStateException("Metadata is read-only!");
    }

    protected void mergeNativeTree(Node root) throws IIOInvalidTreeException
    {
        throw new IllegalStateException("Metadata is read-only!");
    }

    protected void mergeStandardTree(Node root) throws IIOInvalidTreeException
    {
        throw new IllegalStateException("Metadata is read-only!");
    }

    public void reset() {
        throw new IllegalStateException("Metadata is read-only!");
    }
}