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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Standard values to use for <img>/<embed> height & width, if requested.
+var HOST_NODE_HEIGHT = "20";
+var HOST_NODE_WIDTH = "30";
+
+// All the possible values of "align"
+const ALIGN_VALS = ["none",
+ "xMinYMin", "xMinYMid", "xMinYMax",
+ "xMidYMin", "xMidYMid", "xMidYMax",
+ "xMaxYMin", "xMaxYMid", "xMaxYMax"];
+
+// All the possible values of "meetOrSlice"
+const MEETORSLICE_VALS = [ "meet", "slice" ];
+
+/**
+ * Generates full data URI for an SVG document, with the given parameters
+ * on the SVG element.
+ *
+ * @param aViewboxArr An array of four numbers, representing the
+ * viewBox attribute, or null for no viewBox.
+ * @param aWidth The width attribute, or null for no width.
+ * @param aHeight The height attribute, or null for no height.
+ * @param aAlign The 'align' component of the
+ * preserveAspectRatio attribute, or null for none.
+ * @param aMeetOrSlice The 'meetOrSlice' component of the
+ * preserveAspectRatio attribute, or null for
+ * none. (If non-null, implies non-null value for
+ * aAlign.)
+ * @param aViewParams Parameters to use for the view element.
+ * @param aFragmentIdentifier The SVG fragment identifier.
+ */
+function generateSVGDataURI(aViewboxArr, aWidth, aHeight,
+ aAlign, aMeetOrSlice,
+ aViewParams, aFragmentIdentifier) {
+ // prefix
+ var datauri = "data:image/svg+xml,"
+ // Begin the SVG tag
+ datauri += "%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20shape-rendering%3D%22crispEdges%22";
+
+ // Append the custom chunk from our params
+ // If we're working with views, the align customisation is applied there instead
+ datauri += generateSVGAttrsForParams(aViewboxArr, aWidth, aHeight,
+ aViewParams ? null : aAlign,
+ aMeetOrSlice);
+
+ // Add 'font-size' just in case the client wants to use ems
+ datauri += "%20font-size%3D%22" + "10px" + "%22";
+
+ // Put closing right bracket on SVG tag
+ datauri += "%3E";
+
+ if (aViewParams) {
+ // Give the view the id of the fragment identifier
+ datauri += "%3Cview%20id%3D%22" + aFragmentIdentifier + "%22";
+
+ // Append the custom chunk from our view params
+ datauri += generateSVGAttrsForParams(aViewParams.viewBox, null, null,
+ aAlign, aViewParams.meetOrSlice);
+
+ datauri += "%2F%3E";
+ }
+
+ // Add the rest of the SVG document
+ datauri += "%3Crect%20x%3D%221%22%20y%3D%221%22%20height%3D%2218%22%20width%3D%2218%22%20stroke-width%3D%222%22%20stroke%3D%22black%22%20fill%3D%22yellow%22%2F%3E%3Ccircle%20cx%3D%2210%22%20cy%3D%2210%22%20r%3D%228%22%20style%3D%22fill%3A%20blue%22%2F%3E%3C%2Fsvg%3E";
+
+ return datauri;
+}
+
+// Generates just the chunk of a data URI that's relevant to
+// the given params.
+function generateSVGAttrsForParams(aViewboxArr, aWidth, aHeight,
+ aAlign, aMeetOrSlice) {
+ var str = "";
+ if (aViewboxArr) {
+ str += "%20viewBox%3D%22";
+ for (var i in aViewboxArr) {
+ str += aViewboxArr[i];
+ if (i != aViewboxArr.length - 1) {
+ str += "%20";
+ }
+ }
+ str += "%22";
+ }
+ if (aWidth) {
+ str += "%20width%3D%22" + aWidth + "%22";
+ }
+ if (aHeight) {
+ str += "%20height%3D%22" + aHeight + "%22";
+ }
+ if (aAlign) {
+ str += "%20preserveAspectRatio%3D%22" + aAlign;
+ if (aMeetOrSlice) {
+ str += "%20" + aMeetOrSlice;
+ }
+ str += "%22";
+ }
+
+ return str;
+}
+
+// Returns a newly-generated element with the given tagname, the given URI
+// for its |src| attribute, and the given width & height values.
+function generateHostNode(aHostNodeTagName, aUri,
+ aHostNodeWidth, aHostNodeHeight) {
+ var elem = document.createElement(aHostNodeTagName);
+ elem.setAttribute("src", aUri);
+
+ if (aHostNodeWidth) {
+ elem.setAttribute("width", aHostNodeWidth);
+ }
+ if (aHostNodeHeight) {
+ elem.setAttribute("height", aHostNodeHeight);
+ }
+
+ return elem;
+}
+
+// THIS IS THE CHIEF HELPER FUNCTION TO BE CALLED BY CLIENTS
+function appendSVGArrayWithParams(aSVGParams, aHostNodeTagName) {
+ // These are width & height vals that will be used for the *host node*.
+ // (i.e. the <img> or <embed> node -- not the <svg> node)
+ var hostNodeWidthVals = [ null, HOST_NODE_WIDTH ];
+ var hostNodeHeightVals = [ null, HOST_NODE_HEIGHT ];
+
+ for (var i = 0; i < hostNodeWidthVals.length; i++) {
+ var hostNodeWidth = hostNodeWidthVals[i];
+ for (var j = 0; j < hostNodeHeightVals.length; j++) {
+ var hostNodeHeight = hostNodeHeightVals[j];
+ appendSVGSubArrayWithParams(aSVGParams, aHostNodeTagName,
+ hostNodeWidth, hostNodeHeight);
+ }
+ }
+}
+
+// Helper function for above, for a fixed [host-node-width][host-node-height]
+function appendSVGSubArrayWithParams(aSVGParams, aHostNodeTagName,
+ aHostNodeWidth, aHostNodeHeight) {
+ var rootNode = document.getElementsByTagName("body")[0];
+ for (var k = 0; k < ALIGN_VALS.length; k++) {
+ var alignVal = ALIGN_VALS[k];
+ if (!aSVGParams.meetOrSlice) {
+ alignVal = "none";
+ }
+
+ // Generate the Data URI
+ var uri = generateSVGDataURI(aSVGParams.viewBox,
+ aSVGParams.width, aSVGParams.height,
+ alignVal,
+ aSVGParams.meetOrSlice,
+ aSVGParams.view,
+ aSVGParams.fragmentIdentifier);
+
+ if (aSVGParams.fragmentIdentifier) {
+ uri += "#" + aSVGParams.fragmentIdentifier;
+ }
+
+ // Generate & append the host node element
+ var hostNode = generateHostNode(aHostNodeTagName, uri,
+ aHostNodeWidth, aHostNodeHeight);
+ rootNode.appendChild(hostNode);
+
+ // Cosmetic: Add a newline when we get halfway through the ALIGN_VALS
+ // and then again when we reach the end
+ if (k + 1 == ALIGN_VALS.length / 2 ||
+ k + 1 == ALIGN_VALS.length) {
+ rootNode.appendChild(document.createElement("br"));
+ }
+ }
+}