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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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4
Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator.cpp
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@ -937,6 +937,8 @@ static bool is_wrappable_type(IDL::Type const& type)
return true;
if (type.name == "NamedNodeMap")
return true;
if (type.name == "TextMetrics")
return true;
return false;
}
@ -1637,6 +1639,7 @@ void generate_implementation(IDL::Interface const& interface)
#include <LibWeb/Bindings/MessagePortWrapper.h>
#include <LibWeb/Bindings/NamedNodeMapWrapper.h>
#include <LibWeb/Bindings/NodeWrapperFactory.h>
#include <LibWeb/Bindings/TextMetricsWrapper.h>
#include <LibWeb/Bindings/TextWrapper.h>
#include <LibWeb/Bindings/WindowObject.h>
#include <LibWeb/DOM/Element.h>
@ -2808,6 +2811,7 @@ void generate_prototype_implementation(IDL::Interface const& interface)
#include <LibWeb/Bindings/RangeWrapper.h>
#include <LibWeb/Bindings/StyleSheetListWrapper.h>
#include <LibWeb/Bindings/SubtleCryptoWrapper.h>
#include <LibWeb/Bindings/TextMetricsWrapper.h>
#include <LibWeb/Bindings/TextWrapper.h>
#include <LibWeb/Bindings/URLSearchParamsWrapper.h>
#include <LibWeb/Bindings/WindowObject.h>