Method draw

src/fl/gfx/raster_sparse.h:327–340

    // pixels that are within the bounds of the XYMap.
    template <typename XYVisitor>
    void draw(const XYMap &xymap, XYVisitor &visitor) {
        for (const auto &it : mSparseGrid) {
            auto pt = it.first;
            if (!xymap.has(pt.x, pt.y)) {
                continue;
            }
            u32 index = xymap(pt.x, pt.y);
            const CRGB &color = it.second;
            // Only draw non-black pixels (since black represents "no data")
            if (color.r != 0 || color.g != 0 || color.b != 0) {
                visitor.draw(pt, index, color);
            }
        }
    }

    static const int kMaxCacheSize = 8; // Max size for tiny cache.