Method invalidate

src/OpenLoco/src/Graphics/InvalidationGrid.cpp:44–78

    }

    void InvalidationGrid::invalidate(int32_t left, int32_t top, int32_t right, int32_t bottom) noexcept
    {
        left = std::max(left, 0);
        top = std::max(top, 0);
        right = std::min(right, static_cast<int32_t>(_screenWidth));
        bottom = std::min(bottom, static_cast<int32_t>(_screenHeight));

        if (left >= right)
        {
            return;
        }
        if (top >= bottom)
        {
            return;
        }

        left /= _blockWidth;
        right /= _blockWidth;

        top /= _blockHeight;
        bottom /= _blockHeight;

        // TODO: Remove this once _blocks is no longer interop wrapper.
        auto& blocks = _blocks;

        const auto columnSize = right - left + 1;

        for (int16_t y = top; y <= bottom; y++)
        {
            const auto yOffset = y * _columnCount;

            // Mark row by column size as invalidated.
            std::fill_n(blocks.begin() + yOffset + left, columnSize, 0xFF);
        }
    }

}