Merge "Add uncached and perspective shadows to Skia renderer" into oc-dev

    }

    const Vector3 lightPos = SkiaPipeline::getLightCenter();

    SkPoint3 skiaLightPos = SkPoint3::Make(lightPos.x, lightPos.y, lightPos.z);

    if (shadowMatrix.hasPerspective() || revealClipPath || clippedToBounds) {

        std::function<SkScalar(SkScalar, SkScalar)> casterHeightFunc;

        if (shadowMatrix.hasPerspective()) {

            // get the matrix with the full 3D transform

            mat4 zMatrix;

            caster->getRenderNode()->applyViewPropertyTransforms(zMatrix, true);

            SkScalar A = zMatrix[2];

            SkScalar B = zMatrix[6];

            SkScalar C = zMatrix[mat4::kTranslateZ];

            casterHeightFunc = [A, B, C](SkScalar x, SkScalar y) {

                return A*x + B*y + C;  // casterZValue already baked into C

            };

        } else {

            casterHeightFunc = [casterZValue] (SkScalar, SkScalar) {

                return casterZValue;

            };

        }

        SkShadowUtils::DrawUncachedShadow(canvas, *casterPath, casterHeightFunc, skiaLightPos,

            SkiaPipeline::getLightRadius(), ambientAlpha, spotAlpha, SK_ColorBLACK,

            casterAlpha < 1.0f ? SkShadowFlags::kTransparentOccluder_ShadowFlag : 0);

    } else {

        SkShadowUtils::DrawShadow(canvas, *casterPath, casterZValue, skiaLightPos,

            SkiaPipeline::getLightRadius(), ambientAlpha, spotAlpha, SK_ColorBLACK,

            casterAlpha < 1.0f ? SkShadowFlags::kTransparentOccluder_ShadowFlag : 0);

    }

}

}; // namespace skiapipeline

}; // namespace uirenderer