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LibWeb: Implement CanvasRenderingContext2D.measureText

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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
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3
Userland/Libraries/LibWeb/Bindings/WindowObjectHelper.h
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@ -266,6 +266,8 @@
#include <LibWeb/Bindings/TextConstructor.h>
#include <LibWeb/Bindings/TextEncoderConstructor.h>
#include <LibWeb/Bindings/TextEncoderPrototype.h>
#include <LibWeb/Bindings/TextMetricsConstructor.h>
#include <LibWeb/Bindings/TextMetricsPrototype.h>
#include <LibWeb/Bindings/TextPrototype.h>
#include <LibWeb/Bindings/UIEventConstructor.h>
#include <LibWeb/Bindings/UIEventPrototype.h>
@ -422,6 +424,7 @@
ADD_WINDOW_OBJECT_INTERFACE(SVGSVGElement) \
ADD_WINDOW_OBJECT_INTERFACE(Text) \
ADD_WINDOW_OBJECT_INTERFACE(TextEncoder) \
ADD_WINDOW_OBJECT_INTERFACE(TextMetrics) \
ADD_WINDOW_OBJECT_INTERFACE(UIEvent) \
ADD_WINDOW_OBJECT_INTERFACE(URLSearchParams) \
ADD_WINDOW_OBJECT_INTERFACE(URL) \