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LibWeb: Implement CanvasRenderingContext2D.transform

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Luke Wilde 2022-04-10 18:46:04 +01:00 • committed by Andreas Kling
parent 40f584a2bb
commit df7a83ac0e
3 changed files with 19 additions and 0 deletions
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14
Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
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@ -691,6 +691,20 @@ NonnullRefPtr<CanvasGradient> CanvasRenderingContext2D::create_conic_gradient(do
return CanvasGradient::create_conic(start_angle, x, y);
}
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-transform
void CanvasRenderingContext2D::transform(double a, double b, double c, double d, double e, double f)
{
// 1. If any of the arguments are infinite or NaN, then return.
if (!isfinite(a) || !isfinite(b) || !isfinite(c) || !isfinite(d) || !isfinite(e) || !isfinite(f))
return;
// 2. Replace the current transformation matrix with the result of multiplying the current transformation matrix with the matrix described by:
// a c e
// b d f
// 0 0 1
m_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#check-the-usability-of-the-image-argument
DOM::ExceptionOr<CanvasImageSourceUsability> check_usability_of_image(CanvasImageSource const& image)
{

2
Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
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@ -98,6 +98,8 @@ public:
NonnullRefPtr<CanvasGradient> create_linear_gradient(double x0, double y0, double x1, double y1);
NonnullRefPtr<CanvasGradient> create_conic_gradient(double start_angle, double x, double y);
void transform(double a, double b, double c, double d, double e, double f);
private:
explicit CanvasRenderingContext2D(HTMLCanvasElement&);

3
Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.idl
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@ -55,4 +55,7 @@ interface CanvasRenderingContext2D {
CanvasGradient createLinearGradient(double x0, double y0, double x1, double y1);
CanvasGradient createConicGradient(double startAngle, double x, double y);
// FIXME: All these `double`s should be `unrestricted double`
undefined transform(double a, double b, double c, double d, double e, double f);
};