draw_line()

FL_ALWAYS_INLINE void fl::third_party::vorbis::draw_line	(	float *	output,
		int32_t	x0,
		int32_t	y0,
		int32_t	x1,
		int32_t	y1,
		int32_t	n )

Definition at line 1762 of file stb_vorbis.cpp.hpp.

{
   int32_t dy = y1 - y0;
   int32_t adx = x1 - x0;
   int32_t ady = abs(dy);
   int32_t base;
   int32_t x=x0,y=y0;
   int32_t err = 0;
   int32_t sy;
 
#ifdef FL_STB_VORBIS_DIVIDE_TABLE
   if (adx < DIVTAB_DENOM && ady < DIVTAB_NUMER) {
      if (dy < 0) {
         base = -integer_divide_table[ady][adx];
         sy = base-1;
      } else {
         base =  integer_divide_table[ady][adx];
         sy = base+1;
      }
   } else {
      base = dy / adx;
      if (dy < 0)
         sy = base - 1;
      else
         sy = base+1;
   }
#else
   base = dy / adx;
   if (dy < 0)
      sy = base - 1;
   else
      sy = base+1;
#endif
   ady -= abs(base) * adx;
   if (x1 > n) x1 = n;
   if (x < x1) {
      FL_STBV_LINE_OP(output[x], inverse_db_table[y&255]);
      for (++x; x < x1; ++x) {
         err += ady;
         if (err >= adx) {
            err -= adx;
            y += sy;
         } else
            y += base;
         FL_STBV_LINE_OP(output[x], inverse_db_table[y&255]);
      }
   }
}

References fl::abs(), DIVTAB_DENOM, DIVTAB_NUMER, FL_ALWAYS_INLINE, FL_NOEXCEPT, FL_STBV_LINE_OP, integer_divide_table, inverse_db_table, fl::x, and fl::y.

Referenced by do_floor().

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