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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.
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#include <LibWeb/Bindings/TextConstructor.h>
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#include <LibWeb/Bindings/TextEncoderConstructor.h>
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#include <LibWeb/Bindings/TextEncoderPrototype.h>
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#include <LibWeb/Bindings/TextMetricsConstructor.h>
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#include <LibWeb/Bindings/TextMetricsPrototype.h>
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#include <LibWeb/Bindings/TextPrototype.h>
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#include <LibWeb/Bindings/UIEventConstructor.h>
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#include <LibWeb/Bindings/UIEventPrototype.h>
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ADD_WINDOW_OBJECT_INTERFACE(SVGSVGElement) \
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ADD_WINDOW_OBJECT_INTERFACE(Text) \
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ADD_WINDOW_OBJECT_INTERFACE(TextEncoder) \
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ADD_WINDOW_OBJECT_INTERFACE(TextMetrics) \
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ADD_WINDOW_OBJECT_INTERFACE(UIEvent) \
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ADD_WINDOW_OBJECT_INTERFACE(URLSearchParams) \
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ADD_WINDOW_OBJECT_INTERFACE(URL) \
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