gifwritableimagemetadata.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

                                                      "characterCellHeight",
                                                      -1, true,
                                                      true, 1, 65535);

                textForegroundColor = getIntAttribute(node,
                                                      "textForegroundColor",
                                                      -1, true,
                                                      true, 0, 255);

                textBackgroundColor = getIntAttribute(node,
                                                      "textBackgroundColor",
                                                      -1, true,
                                                      true, 0, 255);

                // XXX The "text" attribute of the PlainTextExtension element
                // is not defined in the GIF image metadata format but it is
                // present in the GIFImageMetadata class. Consequently it is
                // used here but not required and with a default of "". See
                // bug 5082763.

                String textString =
                    getStringAttribute(node, "text", "", false, null);
                text = fromISO8859(textString);
            } else if (name.equals("ApplicationExtensions")) {
                IIOMetadataNode applicationExtension =
                    (IIOMetadataNode)node.getFirstChild();

                if (!applicationExtension.getNodeName().equals("ApplicationExtension")) {
                    fatal(node,
                          "Only a ApplicationExtension may be a child of a ApplicationExtensions!");
                }

                String applicationIDString =
                    getStringAttribute(applicationExtension, "applicationID",
                                       null, true, null);

                String authenticationCodeString =
                    getStringAttribute(applicationExtension, "authenticationCode",
                                       null, true, null);

                Object applicationExtensionData =
                    applicationExtension.getUserObject();
                if (applicationExtensionData == null ||
                    !(applicationExtensionData instanceof byte[])) {
                    fatal(applicationExtension,
                          "Bad user object in ApplicationExtension!");
                }

                if (applicationIDs == null) {
                    applicationIDs = new ArrayList();
                    authenticationCodes = new ArrayList();
                    applicationData = new ArrayList();
                }

                applicationIDs.add(fromISO8859(applicationIDString));
                authenticationCodes.add(fromISO8859(authenticationCodeString));
                applicationData.add(applicationExtensionData);
            } else if (name.equals("CommentExtensions")) {
                Node commentExtension = node.getFirstChild();
                if (commentExtension != null) {
                    while(commentExtension != null) {
                        if (!commentExtension.getNodeName().equals("CommentExtension")) {
                            fatal(node,
                                  "Only a CommentExtension may be a child of a CommentExtensions!");
                        }

                        if (comments == null) {
                            comments = new ArrayList();
                        }

                        String comment =
                            getStringAttribute(commentExtension, "value", null,
                                               true, null);

                        comments.add(fromISO8859(comment));

                        commentExtension = commentExtension.getNextSibling();
                    }
                }
            } else {
                fatal(node, "Unknown child of root node!");
            }

            node = node.getNextSibling();
        }
    }

    protected void mergeStandardTree(Node root)
      throws IIOInvalidTreeException {
        Node node = root;
        if (!node.getNodeName()
            .equals(IIOMetadataFormatImpl.standardMetadataFormatName)) {
            fatal(node, "Root must be " +
                  IIOMetadataFormatImpl.standardMetadataFormatName);
        }

        node = node.getFirstChild();
        while (node != null) {
            String name = node.getNodeName();

            if (name.equals("Chroma")) {
                Node childNode = node.getFirstChild();
                while(childNode != null) {
                    String childName = childNode.getNodeName();
                    if (childName.equals("Palette")) {
                        localColorTable = getColorTable(childNode,
                                                        "PaletteEntry",
                                                        false, -1);
                        break;
                    }
                    childNode = childNode.getNextSibling();
                }
            } else if (name.equals("Compression")) {
                Node childNode = node.getFirstChild();
                while(childNode != null) {
                    String childName = childNode.getNodeName();
                    if (childName.equals("NumProgressiveScans")) {
                        int numProgressiveScans =
                            getIntAttribute(childNode, "value", 4, false,
                                            true, 1, Integer.MAX_VALUE);
                        if (numProgressiveScans > 1) {
                            interlaceFlag = true;
                        }
                        break;
                    }
                    childNode = childNode.getNextSibling();
                }
            } else if (name.equals("Dimension")) {
                Node childNode = node.getFirstChild();
                while(childNode != null) {
                    String childName = childNode.getNodeName();
                    if (childName.equals("HorizontalPixelOffset")) {
                        imageLeftPosition = getIntAttribute(childNode,
                                                            "value",
                                                            -1, true,
                                                            true, 0, 65535);
                    } else if (childName.equals("VerticalPixelOffset")) {
                        imageTopPosition = getIntAttribute(childNode,
                                                           "value",
                                                           -1, true,
                                                           true, 0, 65535);
                    }
                    childNode = childNode.getNextSibling();
                }
            } else if (name.equals("Text")) {
                Node childNode = node.getFirstChild();
                while(childNode != null) {
                    String childName = childNode.getNodeName();
                    if (childName.equals("TextEntry") &&
                        getAttribute(childNode, "compression",
                                     "none", false).equals("none") &&
                        Charset.isSupported(getAttribute(childNode,
                                                         "encoding",
                                                         "ISO-8859-1",
                                                         false))) {
                        String value = getAttribute(childNode, "value");
                        byte[] comment = fromISO8859(value);
                        if (comments == null) {
                            comments = new ArrayList();
                        }
                        comments.add(comment);
                    }
                    childNode = childNode.getNextSibling();
                }
            } else if (name.equals("Transparency")) {
                Node childNode = node.getFirstChild();
                while(childNode != null) {
                    String childName = childNode.getNodeName();
                    if (childName.equals("TransparentIndex")) {
                        transparentColorIndex = getIntAttribute(childNode,
                                                                "value",
                                                                -1, true,
                                                                true, 0, 255);
                        transparentColorFlag = true;
                        break;
                    }
                    childNode = childNode.getNextSibling();
                }
            }

            node = node.getNextSibling();
        }
    }

    public void setFromTree(String formatName, Node root)
        throws IIOInvalidTreeException
    {
        reset();
        mergeTree(formatName, root);
    }
}