third_party/cairo/src/cairo-mesh-pattern-rasterizer.c
static inline void
fd_fwd (double f[4])
{
    f[0] += f[1];
    f[1] += f[2];
    f[2] += f[3];
}
/*
 * Perform one step of forward differences along the curve.
 *
 * Input: f[i] is the i-th difference of the curve
 *
 * Output: f[i] is the i-th difference of the curve after one step
 */
Perform one step of forward differences along the curve.
Input: f[i] is the i-th difference of the curve

f[i] is the i-th difference of the curve after one step
Perform one step of forward differences along the curve . Input : f [ i ] is the i - th difference of the curve f [ i ] is the i - th difference of the curve after one step
static inline void
fd_fwd (double f[4])
{
    f[0] += f[1];
    f[1] += f[2];
    f[2] += f[3];
}
static inline void fd_fwd ( double f [ 4 ] ) { f [ 0 ] += f [ 1 ] ; f [ 1 ] += f [ 2 ] ; f [ 2 ] += f [ 3 ] ; }
Perform one step of forward differences along the curve.
Perform one step of forward differences along the curve .