From f5721e4027fe375b2ff35438df9121e5c9dd9e5c Mon Sep 17 00:00:00 2001
From: Marcel Greter <marcel.greter@ocbnet.ch>
Date: Tue, 29 Nov 2016 10:30:53 +0100
Subject: [PATCH] Implement POC for image embedding

---
 xlsx.js | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/xlsx.js b/xlsx.js
index c29f5ce..c07557b 100644
--- a/xlsx.js
+++ b/xlsx.js
@@ -2435,6 +2435,8 @@ var CTYPE_XML_ROOT = writextag('Types', null, {
 
 var CTYPE_DEFAULTS = [
 	['xml', 'application/xml'],
+	['png', 'image/png'],
+	['jpg', 'image/jpeg'],
 	['bin', 'application/vnd.ms-excel.sheet.binary.macroEnabled.main'],
 	['rels', type2ct.rels[0]]
 ].map(function(x) {
@@ -2476,6 +2478,7 @@ function write_ct(ct, opts) {
 	f3('themes');
 	['strs', 'styles'].forEach(f1);
 	['coreprops', 'extprops', 'custprops'].forEach(f3);
+	o[o.length] = '<Override PartName="/xl/drawings/drawing1.xml" ContentType="application/vnd.openxmlformats-officedocument.drawing+xml"/>';
 	if(o.length>2){ o[o.length] = ('</Types>'); o[1]=o[1].replace("/>",">"); }
 	return o.join("");
 }
@@ -2529,6 +2532,39 @@ var RELS_ROOT = writextag('Relationships', null, {
 	'xmlns': XMLNS.RELS
 });
 
+var DRAW_ROOT = writextag('xdr:wsDr', null, {
+	'xmlns:xdr': 'http://schemas.openxmlformats.org/drawingml/2006/spreadsheetDrawing',
+	'xmlns:a': 'http://schemas.openxmlformats.org/drawingml/2006/main'
+	//'xmlns:ns0': XMLNS.RELS,
+	// 'xmlns': XMLNS.RELS
+});
+
+function write_drawing(images) {
+	var o = [];
+	o[o.length] = (XML_HEADER);
+	o[o.length] = (DRAW_ROOT);
+
+	for (var i = 0; i < images.length; i++) {
+		var image = images[i];
+		var pos = image.position || {};
+		if (pos.type === 'twoCellAnchor') {
+			var from = pos.from || {}, to = pos.to || {},
+			    fromCol = from.col || 0, toCol = to.col || 0,
+			    fromRow = from.row || 0, toRow = to.row || 0;
+
+			var twoCell = '<xdr:from><xdr:col>'+fromCol+'</xdr:col><xdr:colOff>0</xdr:colOff><xdr:row>'+fromRow+'</xdr:row><xdr:rowOff>0</xdr:rowOff></xdr:from>';
+			twoCell += '<xdr:to><xdr:col>'+toCol+'</xdr:col><xdr:colOff>0</xdr:colOff><xdr:row>'+toRow+'</xdr:row><xdr:rowOff>99999</xdr:rowOff></xdr:to>';
+			twoCell += '<xdr:pic><xdr:nvPicPr><xdr:cNvPr id="'+(i+1)+'" name="'+image.name+'">'
+			twoCell += '</xdr:cNvPr><xdr:cNvPicPr><a:picLocks noChangeAspect="1"/></xdr:cNvPicPr></xdr:nvPicPr>';
+			twoCell += '<xdr:blipFill><a:blip xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" r:embed="rId1"/>';
+			twoCell += '<a:stretch><a:fillRect/></a:stretch></xdr:blipFill><xdr:spPr><a:prstGeom prst="rect"><a:avLst/></a:prstGeom></xdr:spPr></xdr:pic><xdr:clientData/>';
+			o[o.length] = (writextag('xdr:twoCellAnchor', twoCell, images[0].attrs));
+		}
+	}
+
+	if(o.length>2){ o[o.length] = ('</xdr:wsDr>'); o[1]=o[1].replace("/>",">"); }
+	return o.join("");
+}
 /* TODO */
 function write_rels(rels) {
 	var o = [];
@@ -7562,6 +7598,9 @@ function write_ws_xml(idx, opts, wb) {
 
 	if(ws['!merges'] !== undefined && ws['!merges'].length > 0) o[o.length] = (write_ws_xml_merges(ws['!merges']));
 
+	var images = ws['!images'] || [];
+	if (images.length) o[o.length] = '<drawing r:id="rId1"/>';
+
 	if(o.length>2) { o[o.length] = ('</worksheet>'); o[1]=o[1].replace("/>",">"); }
 	return o.join("");
 }
@@ -11277,6 +11316,9 @@ function add_rels(rels, rId, f, type, relobj) {
 	rels[('/' + relobj.Target).replace("//","/")] = relobj;
 }
 
+RELS.IMG = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/image";
+RELS.DRAW = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/drawing";
+
 function write_zip(wb, opts) {
 	if(wb && !wb.SSF) {
 		wb.SSF = SSF.get_table();
@@ -11324,6 +11366,19 @@ function write_zip(wb, opts) {
 	add_rels(opts.rels, 1, f, RELS.WB);
 
 	for(rId=1;rId <= wb.SheetNames.length; ++rId) {
+		var s = wb.SheetNames[rId-1], ws = wb.Sheets[s],
+		    images = ws['!images'] || [];
+		var rels = ws['!rels'] = [], draw_rels = [];
+		for (var sId=1; sId <= images.length; ++sId) {
+			var image = images[sId - 1];
+			f = 'xl/media/' + image.name;
+			zip.file(f, image.data, image.opts);
+			add_rels(draw_rels, sId, "../media/" + image.name, RELS.IMG);
+		}
+		zip.file("xl/drawings/drawing" + rId + "." + wbext, write_drawing(images));
+		add_rels(rels, rId, "../drawings/drawing" + rId + "." + wbext, RELS.DRAW);
+		zip.file("xl/drawings/_rels/drawing" + rId + "." + wbext + ".rels", write_rels(draw_rels));
+		zip.file("xl/worksheets/_rels/sheet" + rId + "." + wbext + '.rels', write_rels(rels));
 		f = "xl/worksheets/sheet" + rId + "." + wbext;
 		zip.file(f, write_ws(rId-1, f, opts, wb));
 		ct.sheets.push(f);