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LibWeb: Implement SVG preserveAspectRatio attribute

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This attribute is used to define how the viewBox should be scaled.
Previously the behaviour implemented was that of "xMidYMid meet", now
all of them work (expect none :P).

With this the Discord login backend is now correctly scaled/positioned.

This also brings our SVG code a little closer to the spec! With spec
comments and all :^)

(Minor non-visible update to layout tests)
This commit is contained in:
MacDue 2023-04-17 01:20:24 +01:00 • committed by Andreas Kling
parent 5a12e9f222
commit 5df4e64eb7
6 changed files with 205 additions and 25 deletions
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22
Userland/Libraries/LibWeb/SVG/AttributeParser.h
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@ -67,6 +67,27 @@ struct Transform {
Operation operation;
};
struct PreserveAspectRatio {
enum class Align {
None,
xMinYMin,
xMidYMin,
xMaxYMin,
xMinYMid,
xMidYMid,
xMaxYMid,
xMinYMax,
xMidYMax,
xMaxYMax
};
enum class MeetOrSlice {
Meet,
Slice
};
Align align { Align::xMidYMid };
MeetOrSlice meet_or_slice { MeetOrSlice::Meet };
};
class AttributeParser final {
public:
~AttributeParser() = default;
@ -77,6 +98,7 @@ public:
static Vector<Gfx::FloatPoint> parse_points(StringView input);
static Vector<PathInstruction> parse_path_data(StringView input);
static Optional<Vector<Transform>> parse_transform(StringView input);
static Optional<PreserveAspectRatio> parse_preserve_aspect_ratio(StringView input);
private:
AttributeParser(StringView source);