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Bug 1357432 (#750)

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* Part 1. Move IsLocalRefURL to nsContentUtils to reuse this function. (port-rewrite)

`IsLocalRefURL` is originally designed to be used by URLValue only.
Since we need this function in SVGUseElement::LookupHref too, move it to nsContentUtils as a util function.

* Revert "Part 1. Move IsLocalRefURL to nsContentUtils to reuse this function. (port-rewrite)"

This reverts commit 19f010c62022e269f99066a8d90e3522fe31adaf.

* Part 1. Duplicate IsLocalRefURL to nsContentUtils to reuse this function.

`IsLocalRefURL` is originally designed to be used by URLValue only.
Since we need this function in SVGUseElement::LookupHref too, duplicate it to nsContentUtils as a util function.
This is a duplication because CSSValue uses stringbuffers and not nsStrings.
While Bug 1356060 - "Just use nsString in URLValueData" converts this use from stringbuffer to nsString, it builds on a bunch of vartype refactoring (nsString vs. nsAString, etc.) which is too much of a headache to deal with just to deduplicate this simple function.

* Part 2. Implement nsSVGEffects::GetBaseURLForLocalRef to export local-ref-url-resolving logic.

ResolveURLUsingLocalRef is designed to be internally used by nsSVGEffects::Get-{SVGEffect}-URI functions.
Since we also need it in SVGUseElement::LookupHref, make it public in nsSVGEffects.

* Part 3. Resolve local-ref in SVGUseElement::LookupHref by nsSVGEffects::GetBaseURLForLocalRef.

* Part 4. Reftest for using local-ref as xlink:href value.
This commit is contained in:
Moonchild 2018-09-05 03:20:16 +02:00 • committed by Roy Tam
commit 49fc92f4a1
7 changed files with 90 additions and 19 deletions
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14
layout/svg/nsSVGEffects.h
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@ -626,11 +626,23 @@ public:
static already_AddRefed<nsIURI>
GetPaintURI(nsIFrame* aFrame, nsStyleSVGPaint nsStyleSVG::* aPaint);
/**
/**
* A helper function to resolve SVG mask URL.
*/
static already_AddRefed<nsIURI>
GetMaskURI(nsIFrame* aFrame, uint32_t aIndex);
/**
* Return a baseURL for resolving a local-ref URL.
*
* @param aContent an element which uses a local-ref property. Here are some
* examples:
* <rect fill=url(#foo)>
* <circle clip-path=url(#foo)>
* <use xlink:href="#foo">
*/
static already_AddRefed<nsIURI>
GetBaseURLForLocalRef(nsIContent* aContent, nsIURI* aDocURI);
};
#endif /*NSSVGEFFECTS_H_*/