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LibWeb: Factor out canvas rendering options algorihtms

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Factor out canvas parsing algorihtm for CanvasRenderingContext2DSettings
from JS::Value. This was only used in one place but needs to be usable
from other places too in the future.
This commit is contained in:
Totto16 2025-06-18 02:51:52 +02:00 • committed by Andrew Kaster
parent 49500ac386
commit 193ab3757b
Notes: github-actions[bot] 2025-06-30 15:47:50 +00:00
5 changed files with 68 additions and 51 deletions
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56
Libraries/LibWeb/HTML/Canvas/CanvasSettings.cpp Normal file
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/*
* Copyright (c) 2025, Ladybird contributors
* Copyright (c) 2025, Jelle Raaijmakers <jelle@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/FlyString.h>
#include <LibJS/Runtime/VM.h>
#include <LibWeb/HTML/Canvas/CanvasSettings.h>
// https://html.spec.whatwg.org/multipage/canvas.html#canvasrenderingcontext2dsettings
JS::ThrowCompletionOr<Web::HTML::CanvasRenderingContext2DSettings> Web::HTML::CanvasRenderingContext2DSettings::from_js_value(JS::VM& vm, JS::Value value)
{
if (!value.is_nullish() && !value.is_object())
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "CanvasRenderingContext2DSettings");
CanvasRenderingContext2DSettings settings;
if (value.is_nullish())
return settings;
auto& value_object = value.as_object();
JS::Value alpha = TRY(value_object.get("alpha"_fly_string));
settings.alpha = alpha.is_undefined() ? true : alpha.to_boolean();
JS::Value desynchronized = TRY(value_object.get("desynchronized"_fly_string));
settings.desynchronized = desynchronized.is_undefined() ? false : desynchronized.to_boolean();
JS::Value color_space = TRY(value_object.get("colorSpace"_fly_string));
if (!color_space.is_undefined()) {
auto color_space_string = TRY(color_space.to_string(vm));
if (color_space_string == "srgb"sv)
settings.color_space = Bindings::PredefinedColorSpace::Srgb;
else if (color_space_string == "display-p3"sv)
settings.color_space = Bindings::PredefinedColorSpace::DisplayP3;
else
return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidEnumerationValue, color_space_string, "colorSpace");
}
JS::Value color_type = TRY(value_object.get("colorType"_fly_string));
if (!color_type.is_undefined()) {
auto color_type_string = TRY(color_type.to_string(vm));
if (color_type_string == "unorm8"sv)
settings.color_type = Bindings::CanvasColorType::Unorm8;
else if (color_type_string == "float16"sv)
settings.color_type = Bindings::CanvasColorType::Float16;
else
return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidEnumerationValue, color_type_string, "colorType");
}
JS::Value will_read_frequently = TRY(value_object.get("willReadFrequently"_fly_string));
settings.will_read_frequently = will_read_frequently.is_undefined() ? false : will_read_frequently.to_boolean();
return settings;
}