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LibWeb: Implement CanvasRenderingContext2D.measureText

This requires an implementation of the "text preparation algorithm" as
specified here:

html.spec.whatwg.org/multipage/canvas.html#text-preparation-algorithm

However, we're missing a lot of things such as the
CanvasTextDrawingStyles interface, so most of the algorithm was not
implemented. Additionally, we also are not able to use a LineBox like
the algorithm suggests, because our layouting infra is not up to the
task yet. The prepare_text function does nothing other than figuring out
the width of the given text and return glyphs with offsets at the
moment.
This commit is contained in:
sin-ack 2021-12-30 22:15:38 +00:00 committed by Linus Groh
parent 732e41714a
commit 9121cc7cae
10 changed files with 253 additions and 0 deletions

View file

@ -208,6 +208,7 @@ class MessagePort;
class PageTransitionEvent;
class PromiseRejectionEvent;
class SubmitEvent;
class TextMetrics;
class WebSocket;
}
@ -439,6 +440,7 @@ class SVGGraphicsElementWrapper;
class SVGPathElementWrapper;
class SVGSVGElementWrapper;
class TextEncoderWrapper;
class TextMetricsWrapper;
class TextWrapper;
class UIEventWrapper;
class URLConstructor;