void
PathBuilderCG::Arc(const Point &aOrigin, Float aRadius, Float aStartAngle,
Float aEndAngle, bool aAntiClockwise)
{
if (!aOrigin.IsFinite() || !IsFinite(aRadius) ||
!IsFinite(aStartAngle) || !IsFinite(aEndAngle)) {
return;
}
// Disabled for now due to a CG bug when using CGPathAddArc with stroke
// dashing and rotation transforms that are multiples of 90 degrees. See:
// https://bugzilla.mozilla.org/show_bug.cgi?id=949661#c8
#if 0
// Core Graphic's initial coordinate system is y-axis up, whereas Moz2D's is
// y-axis down. Core Graphics therefore considers "clockwise" to mean "sweep
// in the direction of decreasing angle" whereas Moz2D considers it to mean
// "sweep in the direction of increasing angle". In other words if this
// Moz2D method is instructed to sweep anti-clockwise we need to tell
// CGPathAddArc to sweep clockwise, and vice versa. Hence why we pass the
// value of aAntiClockwise directly to CGPathAddArc's "clockwise" bool
// parameter.
CGPathAddArc(mCGPath, nullptr,
aOrigin.x, aOrigin.y,
aRadius,
aStartAngle,
aEndAngle,
aAntiClockwise);
#endif
ArcToBezier(this, aOrigin, Size(aRadius, aRadius), aStartAngle, aEndAngle,
aAntiClockwise);
}
void
PathBuilderCairo::Arc(const Point &aOrigin, float aRadiusX, float aRadiusY, float aRotationAngle,
float aStartAngle, float aEndAngle, bool aAntiClockwise)
{
ArcToBezier(this, aOrigin, Size(aRadiusX, aRadiusY), aStartAngle, aEndAngle, aAntiClockwise);
}
void
FlattenedPath::Arc(const Point &aOrigin, float aRadius, float aStartAngle,
float aEndAngle, bool aAntiClockwise)
{
ArcToBezier(this, aOrigin, Size(aRadius, aRadius), aStartAngle, aEndAngle, aAntiClockwise);
}
void
PathBuilderSkia::Arc(const Point &aOrigin, float aRadius, float aStartAngle,
float aEndAngle, bool aAntiClockwise)
{
ArcToBezier(this, aOrigin, aRadius, aStartAngle, aEndAngle, aAntiClockwise);
}
