Add examples to the doc pages (#151)

* Push JS examples in doc page

* fix jsoo assets decoding

* simpler exception handling

Makefile

@@ -26,6 +26,11 @@ doc-common: build
 	mkdir -p _build/docs
 	rsync -auv docs/. _build/docs/.
 
+doc-examples: build
+	mkdir -p _build/docs/examples
+	cp _build/default/examples/*.js _build/docs/examples/.
+	cp _build/default/examples/*.html _build/docs/examples/.
+
 sphinx: doc-common
 	sphinx-build sphinx ${SPHINX_TARGET}
 
@@ -34,7 +39,7 @@ odoc: doc-common
 	opam exec -- dune build @doc
 	rsync -auv --delete _build/default/_doc/_html/. ${ODOC_TARGET}
 
-doc: doc-common odoc sphinx
+doc: doc-common doc-examples odoc sphinx
 
 view:
 	xdg-open file://$$(pwd)/_build/docs/index.html

docs/index.html

@@ -25,6 +25,7 @@ <h1>OCaml-Canvas</h1>
           <li><a href="https://github.com/ocamlpro/ocaml-canvas">Project on Github</a></li>
           <li><a href="https://ocamlpro.github.io/ocaml-canvas/sphinx">General Documentation</a></li>
           <li><a href="https://ocamlpro.github.io/ocaml-canvas/doc">API Documentation</a></li>
+          <li><a href="examples/index.html">Examples</a></li>
           <li><a href="https://github.com/ocamlpro/ocaml-canvas/issues">Bug reports</a></li>
         </ul>
         <h3>Authors:</h3>

src/stubs/ml_canvas.js

@@ -217,14 +217,15 @@ function _frame_handler(timestamp) {
 /* Image Data (aka Pixmaps) */
 
 //Provides: _ml_canvas_image_of_png_file
-//Requires: caml_read_file_content
+//Requires: caml_read_file_content, caml_raise_with_string, caml_named_value
 function _ml_canvas_image_of_png_file(filename) {
   var file = caml_read_file_content(filename);
   if (file === null) {
     return null;
   }
   var fc = caml_read_file_content(filename);
-  var data = window.btoa(fc.toUft16 === undefined ? fc.c : fc);
+  // Test for mlBytes or JS-string
+  var data = window.btoa(fc.c === undefined ? fc : fc.c);
   var img = new window.Image();
   img.loading = 'eager';
   img.decoding = 'sync';
@@ -294,8 +295,6 @@ function ml_canvas_image_data_create_from_png(filename, onload) {
     var ba = _ml_canvas_ba_of_img(img[1]);
     onload(ba);
     return 0;
-  }, function (__err) {
-    return 0;
   });
   return 0;
 }
@@ -440,8 +439,6 @@ function ml_canvas_image_data_import_png(data, pos, filename, onload) {
     }
     onload(data);
     return 0;
-  }, function (__err) {
-    return 0;
   });
   return 0;
 }
@@ -850,8 +847,6 @@ function ml_canvas_create_offscreen_from_png(filename, onload) {
     canvas.ctxt.drawImage(img[1], 0, 0);
     onload(canvas);
     return 0;
-  }, function (__err) {
-    return 0;
   });
   return 0;
 }
@@ -1550,8 +1545,6 @@ function ml_canvas_import_png(canvas, pos, filename, onload) {
     // image, sx, sy, sWitdh, sHeight, dx, dy, dWidth, dHeight
     onload(canvas);
     return 0;
-  }, function (__err) {
-    return 0;
   });
   return 0;
 }