LibWeb: Make HTMLVideoElement part of CanvasImageSource union

Author: https://github.com/Totto16 🔰
Commit: abe1172d70
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1635

Tests/LibWeb/Text/expected/canvas/pattern-from-video.txt

@@ -0,0 +1,2 @@
+null
+PASS (didn't throw!)

Tests/LibWeb/Text/input/canvas/pattern-from-video.html

@@ -0,0 +1,10 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        let canvas = document.createElement("canvas");
+        let ctx = canvas.getContext("2d");
+        let v = document.createElement("video");
+        println(ctx.createPattern(v, 'repeat'));
+        println("PASS (didn't throw!)");
+    });
+</script>

Userland/Libraries/LibWeb/HTML/Canvas/CanvasDrawImage.cpp

@@ -23,6 +23,15 @@ static void default_source_size(CanvasImageSource const& image, float& source_wi
                 source_height = source->height()->anim_val()->value();
             }
         },
+        [&source_width, &source_height](JS::Handle<HTML::HTMLVideoElement> const& source) {
+            if (auto const bitmap = source->bitmap(); bitmap) {
+                source_width = bitmap->width();
+                source_height = bitmap->height();
+            } else {
+                source_width = source->video_width();
+                source_height = source->video_height();
+            }
+        },
         [&source_width, &source_height](auto const& source) {
             if (source->bitmap()) {
                 source_width = source->bitmap()->width();

Userland/Libraries/LibWeb/HTML/Canvas/CanvasDrawImage.h

@@ -9,13 +9,14 @@
 #include <LibWeb/Forward.h>
 #include <LibWeb/HTML/HTMLCanvasElement.h>
 #include <LibWeb/HTML/HTMLImageElement.h>
+#include <LibWeb/HTML/HTMLVideoElement.h>
 #include <LibWeb/WebIDL/ExceptionOr.h>
 
 namespace Web::HTML {
 
 // https://html.spec.whatwg.org/multipage/canvas.html#canvasimagesource
 // NOTE: This is the Variant created by the IDL wrapper generator, and needs to be updated accordingly.
-using CanvasImageSource = Variant<JS::Handle<HTMLImageElement>, JS::Handle<SVG::SVGImageElement>, JS::Handle<HTMLCanvasElement>, JS::Handle<ImageBitmap>>;
+using CanvasImageSource = Variant<JS::Handle<HTMLImageElement>, JS::Handle<SVG::SVGImageElement>, JS::Handle<HTMLCanvasElement>, JS::Handle<ImageBitmap>, JS::Handle<HTMLVideoElement>>;
 
 // https://html.spec.whatwg.org/multipage/canvas.html#canvasdrawimage
 class CanvasDrawImage {

Userland/Libraries/LibWeb/HTML/Canvas/CanvasDrawImage.idl

@@ -1,12 +1,13 @@
 #import <HTML/HTMLCanvasElement.idl>
 #import <HTML/HTMLImageElement.idl>
+#import <HTML/HTMLVideoElement.idl>
 #import <HTML/ImageBitmap.idl>
 #import <SVG/SVGImageElement.idl>
 
 typedef (HTMLImageElement or
          SVGImageElement or
 // FIXME: We should use HTMLOrSVGImageElement instead of HTMLImageElement
-// FIXME: HTMLVideoElement or
+         HTMLVideoElement or
          HTMLCanvasElement or
          ImageBitmap
 // FIXME: OffscreenCanvas

Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp

@@ -587,8 +587,13 @@ WebIDL::ExceptionOr<CanvasImageSourceUsability> check_usability_of_image(CanvasI
             return Optional<CanvasImageSourceUsability> {};
         },
 
-        // FIXME: HTMLVideoElement
+        [](JS::Handle<HTML::HTMLVideoElement> const& video_element) -> WebIDL::ExceptionOr<Optional<CanvasImageSourceUsability>> {
             // If image's readyState attribute is either HAVE_NOTHING or HAVE_METADATA, then return bad.
+            if (video_element->ready_state() == HTML::HTMLMediaElement::ReadyState::HaveNothing || video_element->ready_state() == HTML::HTMLMediaElement::ReadyState::HaveMetadata) {
+                return { CanvasImageSourceUsability::Bad };
+            }
+            return Optional<CanvasImageSourceUsability> {};
+        },
 
         // HTMLCanvasElement
         // FIXME: OffscreenCanvas
@@ -627,10 +632,10 @@ bool image_is_not_origin_clean(CanvasImageSource const& image)
             // FIXME: image's current request's image data is CORS-cross-origin.
             return false;
         },
-
-        // FIXME: HTMLVideoElement
-        // image's media data is CORS-cross-origin.
-
+        [](JS::Handle<HTML::HTMLVideoElement> const&) {
+            // FIXME: image's media data is CORS-cross-origin.
+            return false;
+        },
         // HTMLCanvasElement
         [](OneOf<JS::Handle<HTMLCanvasElement>, JS::Handle<ImageBitmap>> auto const&) {
             // FIXME: image's bitmap's origin-clean flag is false.

Userland/Libraries/LibWeb/HTML/HTMLVideoElement.h

@@ -42,6 +42,12 @@ public:
     VideoFrame const& current_frame() const { return m_current_frame; }
     RefPtr<Gfx::Bitmap> const& poster_frame() const { return m_poster_frame; }
 
+    // FIXME: This is a hack for images used as CanvasImageSource. Do something more elegant.
+    RefPtr<Gfx::Bitmap> bitmap() const
+    {
+        return current_frame().frame;
+    }
+
 private:
     HTMLVideoElement(DOM::Document&, DOM::QualifiedName);