Update demo favicons

@@ -55,3 +55,4 @@ cache_*
 package.json
 
 GeneratedPluginRegistrant.*
+test/social_preview.png

@@ -267,6 +267,7 @@ ref: svg
 	cd $@; curl -OL 'https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/pdf_reference_1-7.pdf'
 
 gh-pages: all
+	cd test; $(DART_BIN) --enable-asserts github_social_preview.dart
 	cd demo; $(FLUTTER_BIN) build web
 	git checkout gh-pages
 	rm -rf assets icons

@@ -40,3 +40,5 @@ assets/*.png
 assets/*.jpg
 assets/logo.svg
 linux
+
+web/*.png

@@ -21,7 +21,7 @@
   <meta name="apple-mobile-web-app-capable" content="yes">
   <meta name="apple-mobile-web-app-status-bar-style" content="black">
   <meta name="apple-mobile-web-app-title" content="printing_demo">
-  <link rel="apple-touch-icon" href="icons/Icon-192.png">
+  <link rel="apple-touch-icon" href="icon-192.png">
 
   <!-- Favicon -->
   <link rel="icon" type="image/png" href="favicon.png"/>

@@ -10,12 +10,12 @@
     "prefer_related_applications": false,
     "icons": [
         {
-            "src": "icons/Icon-192.png",
+            "src": "icon-192.png",
             "sizes": "192x192",
             "type": "image/png"
         },
         {
-            "src": "icons/Icon-512.png",
+            "src": "icon-512.png",
             "sizes": "512x512",
             "type": "image/png"
         }

@@ -68,7 +68,7 @@ Future<void> main() async {
             ),
           ),
           // Add a vertical separator
-          Container(width: 5 * px, color: PdfColors.lightBlue),
+          VerticalDivider(width: 5 * px, color: PdfColors.lightBlue),
           // Show "Hello World!" centered and rotated on the second half of the page
           Flexible(
             fit: FlexFit.tight,
@@ -95,8 +95,62 @@ Future<void> main() async {
   await File('social_preview.pdf').writeAsBytes(await pdf.save());
 
   // Convert to png
-  Process.runSync('pdftocairo',
-      ['social_preview.pdf', '-png', '-r', '72', 'social_preview.png']);
+  Process.runSync('pdftocairo', [
+    'social_preview.pdf',
+    '-png',
+    '-singlefile',
+    '-r',
+    dpi.toString(),
+    'social_preview',
+  ]);
+
+  // Generate some favicons
+  Document.debug = false;
+
+  // Create a pdf document
+  final favicon = Document();
+
+  favicon.addPage(
+    Page(
+      pageFormat: PdfPageFormat(512, 512),
+      build: (context) => Center(child: PdfLogo()),
+    ),
+  );
+
+  await File('favicon.pdf').writeAsBytes(await favicon.save());
+
+  // Convert to png
+  Process.runSync('pdftocairo', [
+    'favicon.pdf',
+    '-png',
+    '-singlefile',
+    '-transp',
+    '-r',
+    dpi.toString(),
+    '../demo/web/icon-512',
+  ]);
+  Process.runSync('pdftocairo', [
+    'favicon.pdf',
+    '-png',
+    '-singlefile',
+    '-transp',
+    '-scale-to',
+    '192',
+    '-r',
+    dpi.toString(),
+    '../demo/web/icon-192',
+  ]);
+  Process.runSync('pdftocairo', [
+    'favicon.pdf',
+    '-png',
+    '-singlefile',
+    '-transp',
+    '-scale-to',
+    '16',
+    '-r',
+    dpi.toString(),
+    '../demo/web/favicon',
+  ]);
 }
 
 class SyntaxHighlighterStyle {