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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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2
Userland/Libraries/LibWeb/CMakeLists.txt
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@ -195,6 +195,7 @@ set(SOURCES
HTML/Scripting/Script.cpp
HTML/SyntaxHighlighter/SyntaxHighlighter.cpp
HTML/TagNames.cpp
HTML/TextMetrics.cpp
HTML/WebSocket.cpp
HighResolutionTime/Performance.cpp
ImageDecoding.cpp
@ -485,6 +486,7 @@ libweb_js_wrapper(HTML/MessagePort)
libweb_js_wrapper(HTML/PageTransitionEvent)
libweb_js_wrapper(HTML/PromiseRejectionEvent)
libweb_js_wrapper(HTML/SubmitEvent)
libweb_js_wrapper(HTML/TextMetrics)
libweb_js_wrapper(HTML/WebSocket)
libweb_js_wrapper(HighResolutionTime/Performance)
libweb_js_wrapper(IntersectionObserver/IntersectionObserver)