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LibWeb: Add <canvas> element and start fleshing out CRC2D

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This patch adds HTMLCanvasElement along with a LayoutCanvas object.
The DOM and layout parts are very similar to <img> elements.

The <canvas> element holds a Gfx::Bitmap which is sized according to
the "width" and "height" attributes on the element.

Calling .getContext("2d") on a <canvas> element gives you a context
object that draws into the underlying Gfx::Bitmap of the <canvas>.
The context weakly points to the <canvas> which allows it to outlive
the canvas element if needed.

This is really quite cool. :^)
This commit is contained in:
Andreas Kling 2020-03-19 19:07:56 +01:00
parent 73d28a0551
commit a37c29e353
19 changed files with 649 additions and 1 deletions
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3
Libraries/LibWeb/DOM/ElementFactory.cpp
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@ -29,6 +29,7 @@
#include <LibWeb/DOM/HTMLBRElement.h>
#include <LibWeb/DOM/HTMLBlinkElement.h>
#include <LibWeb/DOM/HTMLBodyElement.h>
#include <LibWeb/DOM/HTMLCanvasElement.h>
#include <LibWeb/DOM/HTMLFontElement.h>
#include <LibWeb/DOM/HTMLFormElement.h>
#include <LibWeb/DOM/HTMLHRElement.h>
@ -85,6 +86,8 @@ NonnullRefPtr<Element> create_element(Document& document, const String& tag_name
}
if (lowercase_tag_name == "script")
return adopt(*new HTMLScriptElement(document, lowercase_tag_name));
if (lowercase_tag_name == "canvas")
return adopt(*new HTMLCanvasElement(document, lowercase_tag_name));
return adopt(*new Element(document, lowercase_tag_name));
}