GrRRectEffect Namespace Reference

Functions
GrFPResult	Make (std::unique_ptr< GrFragmentProcessor >, GrClipEdgeType, const SkRRect &, const GrShaderCaps &)

Function Documentation

Make()

GrFPResult GrRRectEffect::Make	(	std::unique_ptr< GrFragmentProcessor >	inputFP,
		GrClipEdgeType	edgeType,
		const SkRRect &	rrect,
		const GrShaderCaps &	caps
	)

Creates an effect that performs anti-aliased clipping against a SkRRect. It doesn't support all varieties of SkRRect, so the caller must check success in the GrFPResult.

Definition at line 713 of file GrRRectEffect.cpp.

                                                         {
    if (rrect.isRect()) {
        auto fp = GrFragmentProcessor::Rect(std::move(inputFP), edgeType, rrect.getBounds());
        return GrFPSuccess(std::move(fp));
    }
 
    if (rrect.isOval()) {
        return GrOvalEffect::Make(std::move(inputFP), edgeType, rrect.getBounds(), caps);
    }
 
    if (rrect.isSimple()) {
        if (SkRRectPriv::GetSimpleRadii(rrect).fX < kRadiusMin ||
            SkRRectPriv::GetSimpleRadii(rrect).fY < kRadiusMin) {
            // In this case the corners are extremely close to rectangular and we collapse the
            // clip to a rectangular clip.
            auto fp = GrFragmentProcessor::Rect(std::move(inputFP), edgeType, rrect.getBounds());
            return GrFPSuccess(std::move(fp));
        }
        if (SkRRectPriv::IsSimpleCircular(rrect)) {
            return CircularRRectEffect::Make(std::move(inputFP), edgeType,
                                             CircularRRectEffect::kAll_CornerFlags, rrect);
        } else {
            return EllipticalRRectEffect::Make(std::move(inputFP), edgeType, rrect);
        }
    }
 
    if (rrect.isComplex() || rrect.isNinePatch()) {
        // Check for the "tab" cases - two adjacent circular corners and two square corners.
        SkScalar circularRadius = 0;
        uint32_t cornerFlags  = 0;
 
        SkVector radii[4];
        bool squashedRadii = false;
        for (int c = 0; c < 4; ++c) {
            radii[c] = rrect.radii((SkRRect::Corner)c);
            // This effect can't handle a corner with both zero and non-zero radii
            if ((0 == radii[c].fX) != (0 == radii[c].fY)) {
                return GrFPFailure(std::move(inputFP));
            }
            if (0 == radii[c].fX) {
                // The corner is square, so no need to squash or flag as circular.
                continue;
            }
            if (radii[c].fX < kRadiusMin || radii[c].fY < kRadiusMin) {
                radii[c].set(0, 0);
                squashedRadii = true;
                continue;
            }
            if (radii[c].fX != radii[c].fY) {
                cornerFlags = ~0U;
                break;
            }
            if (!cornerFlags) {
                circularRadius = radii[c].fX;
                cornerFlags = 1 << c;
            } else {
                if (radii[c].fX != circularRadius) {
                   cornerFlags = ~0U;
                   break;
                }
                cornerFlags |= 1 << c;
            }
        }
 
        switch (cornerFlags) {
            case CircularRRectEffect::kAll_CornerFlags:
                // This rrect should have been caught in the simple case above. Though, it would
                // be correctly handled in the fallthrough code.
                SkASSERT(false);
                [[fallthrough]];
            case CircularRRectEffect::kTopLeft_CornerFlag:
            case CircularRRectEffect::kTopRight_CornerFlag:
            case CircularRRectEffect::kBottomRight_CornerFlag:
            case CircularRRectEffect::kBottomLeft_CornerFlag:
            case CircularRRectEffect::kLeft_CornerFlags:
            case CircularRRectEffect::kTop_CornerFlags:
            case CircularRRectEffect::kRight_CornerFlags:
            case CircularRRectEffect::kBottom_CornerFlags: {
                SkTCopyOnFirstWrite<SkRRect> rr(rrect);
                if (squashedRadii) {
                    rr.writable()->setRectRadii(rrect.getBounds(), radii);
                }
                return CircularRRectEffect::Make(std::move(inputFP), edgeType, cornerFlags, *rr);
            }
            case CircularRRectEffect::kNone_CornerFlags: {
                auto fp =
                        GrFragmentProcessor::Rect(std::move(inputFP), edgeType, rrect.getBounds());
                return GrFPSuccess(std::move(fp));
            }
            default: {
                const SkVector ul = rrect.radii(SkRRect::kUpperLeft_Corner);
                const SkVector lr = rrect.radii(SkRRect::kLowerRight_Corner);
                if (rrect.isNinePatch()  &&
                    ul.fX >= kRadiusMin  &&
                    ul.fY >= kRadiusMin  &&
                    lr.fX >= kRadiusMin  &&
                    lr.fY >= kRadiusMin) {
                    return EllipticalRRectEffect::Make(std::move(inputFP), edgeType, rrect);
                }
                return GrFPFailure(std::move(inputFP));
            }
        }
    }
    return GrFPFailure(std::move(inputFP));
}