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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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Libraries/LibWeb/Layout/LayoutNode.h
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@ -87,6 +87,7 @@ public:
virtual bool is_replaced() const { return false; }
virtual bool is_widget() const { return false; }
virtual bool is_image() const { return false; }
virtual bool is_canvas() const { return false; }
virtual bool is_box() const { return false; }
virtual bool is_table() const { return false; }
virtual bool is_table_row() const { return false; }