Add support for canvas and multipart

Quite incomplete canvas implementation. Crucially, the layout engine
can't do much with whatever is drawn because it doesn't support images
yet.

I've re-introduced multipart as well, with the FormData API. For the
append function I've also introduced a hack to the JS binding generator
that allows requesting the JSContext pointer in nim procs. Really I
should just fix the union generator thing and add support for overloading.

In conclusion, for now the only thing canvas can be used for is exporting
it as PNG and uploading it somewhere. Also, we now have PNG encoding and
decoding too. (Now if only we had sixels as well...)

1 files changed, 17 insertions, 0 deletions

diff --git a/src/html/env.nim b/src/html/env.nim
index 544f5083..8b558b8a 100644
--- a/src/html/env.nim
+++ b/src/html/env.nim
@@ -6,9 +6,12 @@ import html/htmlparser
 import io/loader
 import io/promise
 import io/request
+import js/intl
 import js/javascript
 import js/timeout
+import types/blob
 import types/url
+import xhr/formdata as formdata_impl
 
 # NavigatorID
 proc appCodeName(navigator: Navigator): string {.jsfget.} = "Mozilla"
@@ -73,6 +76,16 @@ proc clearTimeout(window: Window, id: int32) {.jsfunc.} =
 proc clearInterval(window: Window, id: int32) {.jsfunc.} =
   window.timeouts.clearInterval(id)
 
+proc screenX(window: Window): int64 {.jsfget.} = 0
+proc screenY(window: Window): int64 {.jsfget.} = 0
+proc screenLeft(window: Window): int64 {.jsfget.} = 0
+proc screenTop(window: Window): int64 {.jsfget.} = 0
+#TODO outerWidth, outerHeight
+proc devicePixelRatio(window: Window): float64 {.jsfget.} = 1
+
+func location(window: Window): URL {.jsfget.} =
+  window.document.location
+
 proc addScripting*(window: Window, selector: Selector[int]) =
   let rt = newJSRuntime()
   let ctx = rt.newJSContext()
@@ -102,6 +115,10 @@ proc addScripting*(window: Window, selector: Selector[int]) =
   ctx.addDOMModule()
   ctx.addURLModule()
   ctx.addHTMLModule()
+  ctx.addIntlModule()
+  ctx.addBlobModule()
+  ctx.addFormDataModule()
+  ctx.addRequestModule()
 
 proc runJSJobs*(window: Window) =
   window.jsrt.runJSJobs(window.console.err)