Bug 42211 – Canvas: rect(x,y,w,h) should move to (x,y) even if w=0 and h=0

• Status: RESOLVED
• Resolution: FIXED
• Component: WebCore Misc.

[Andreas Kling]

Quoth HTML5:

The rect(x, y, w, h) method must create a new subpath containing just the four points (x, y), (x+w, y), (x+w, y+h), (x, y+h), with those four points connected by straight lines, and must then mark the subpath as closed. It must then create a new subpath with the point (x, y) as the only point in the subpath.

This would fix one in-tree layout test:
- canvas/philip/tests/2d.path.rect.zero.4.html

Spec link:
http://www.whatwg.org/specs/web-apps/current-work/#dom-context-2d-rect

[Andreas Kling]

Created attachment 61433 [details]
Proposed patch

[Darin Adler]

Comment on attachment 61433 [details]
Proposed patch

Do we still need the validateRectForCanvas function? Can we refactor it so we can still use it?

> +    if (!isfinite(x) | !isfinite(y) | !isfinite(width) | !isfinite(height))
> +        return;

Why "|" instead of "||"?

> +    if (width < 0) {
> +        width = -width;
> +        x -= width;
> +    }
> +
> +    if (height < 0) {
> +        height = -height;
> +        y -= height;
> +    }

It’s inelegant to modify the arguments like this.

r=me

[Andreas Kling]

Committed r63270: <http://trac.webkit.org/changeset/63270>