Method write

src/fl/gfx/raster_sparse.h:166–204

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

    void write(const vec2<u16> &pt, u8 value) {
        // FL_WARN("write: " << pt.x << "," << pt.y << " value: " <<
        // value); mSparseGrid.insert(pt, value);

        u8 **cached = mCache.find_value(pt);
        if (cached) {
            u8 *val = *cached;
            if (*val < value) {
                *val = value;
            }
            return;
        }
        if (mCache.size() <= kMaxCacheSize) {
            // cache it.
            u8 *v = mSparseGrid.find_value(pt);
            if (v == nullptr) {
                // FL_WARN("write: " << pt.x << "," << pt.y << " value: "
                // << value);
                if (mSparseGrid.needs_rehash()) {
                    // mSparseGrid is about to rehash, so we need to clear the
                    // small cache because it shares pointers.
                    mCache.clear();
                }

                mSparseGrid.insert(pt, value);
                return;
            }
            mCache.insert(pt, v);
            if (*v < value) {
                *v = value;
            }
            return;
        } else {
            // overflow, clear cache and write directly.
            mCache.clear();
            mSparseGrid.insert(pt, value);
            return;
        }
    }

  private:
    using Key = vec2<u16>;