Method row_ptr

dep/agg/include/agg_rendering_buffer.h:97–100

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        //--------------------------------------------------------------------
        AGG_INLINE T* row_ptr(int, int y, unsigned)
        {
            return m_start + y * (AGG_INT64)m_stride;
        }
        AGG_INLINE T* row_ptr(int y)
        {
            return m_start + y * (AGG_INT64)m_stride;