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LibWeb: Add missing Canvas Context2D transform functions

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Bastiaan van der Plaat 2023-09-09 21:57:59 +02:00 • committed by Andrew Kaster
parent 0d7b13edac
commit 8e7d3a6acc
4 changed files with 81 additions and 2 deletions
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26
Userland/Libraries/LibWeb/HTML/Canvas/CanvasTransform.h
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@ -9,6 +9,7 @@
#pragma once
#include <AK/Debug.h>
#include <LibWeb/Geometry/DOMMatrix.h>
#include <LibWeb/HTML/Canvas/CanvasState.h>
namespace Web::HTML {
@ -52,6 +53,15 @@ public:
my_drawing_state().transform.multiply({ static_cast<float>(a), static_cast<float>(b), static_cast<float>(c), static_cast<float>(d), static_cast<float>(e), static_cast<float>(f) });
}
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-gettransform
WebIDL::ExceptionOr<JS::NonnullGCPtr<Geometry::DOMMatrix>> get_transform()
{
auto& realm = static_cast<IncludingClass&>(*this).realm();
auto transform = my_drawing_state().transform;
Geometry::DOMMatrix2DInit init = { transform.a(), transform.b(), transform.c(), transform.d(), transform.e(), transform.f(), {}, {}, {}, {}, {}, {} };
return Geometry::DOMMatrix::create_from_dom_matrix_2d_init(realm, init);
}
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-settransform
void set_transform(double a, double b, double c, double d, double e, double f)
{
@ -66,6 +76,22 @@ public:
transform(a, b, c, d, e, f);
}
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-settransform-matrix
WebIDL::ExceptionOr<void> set_transform(Geometry::DOMMatrix2DInit& init)
{
// 1. Let matrix be the result of creating a DOMMatrix from the 2D dictionary transform.
auto& realm = static_cast<IncludingClass&>(*this).realm();
auto matrix = TRY(Geometry::DOMMatrix::create_from_dom_matrix_2d_init(realm, init));
// 2. If one or more of matrix's m11 element, m12 element, m21 element, m22 element, m41 element, or m42 element are infinite or NaN, then return.
if (!isfinite(matrix->m11()) || !isfinite(matrix->m12()) || !isfinite(matrix->m21()) || !isfinite(matrix->m22()) || !isfinite(matrix->m41()) || !isfinite(matrix->m42()))
return {};
// 3. Reset the current transformation matrix to matrix.
my_drawing_state().transform = { static_cast<float>(matrix->a()), static_cast<float>(matrix->b()), static_cast<float>(matrix->c()), static_cast<float>(matrix->d()), static_cast<float>(matrix->e()), static_cast<float>(matrix->f()) };
return {};
}
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-resettransform
void reset_transform()
{