C++ (Cpp) gimp_rgba_add Examples

Example #1

File: van-gogh-lic.c Project: AdamGrzonkowski/gimp-1

static void
lic_image (GimpPixelRgn *src_rgn,
           gint          x,
           gint          y,
           gdouble       vx,
           gdouble       vy,
           GimpRGB      *color)
{
  gdouble u, step = 2.0 * l / isteps;
  gdouble xx = (gdouble) x, yy = (gdouble) y;
  gdouble c, s;
  GimpRGB col = { 0, 0, 0, 0 };
  GimpRGB col1, col2, col3;

  /* Get vector at x,y */
  /* ================= */

  c = vx;
  s = vy;

  /* Calculate integral numerically */
  /* ============================== */

  getpixel (src_rgn, &col1, xx + l * c, yy + l * s);
  if (source_drw_has_alpha)
    gimp_rgba_multiply (&col1, filter (-l));
  else
    gimp_rgb_multiply (&col1, filter (-l));

  for (u = -l + step; u <= l; u += step)
    {
      getpixel (src_rgn, &col2, xx - u * c, yy - u * s);
      if (source_drw_has_alpha)
        {
          gimp_rgba_multiply (&col2, filter (u));

          col3 = col1;
          gimp_rgba_add (&col3, &col2);
          gimp_rgba_multiply (&col3, 0.5 * step);
          gimp_rgba_add (&col, &col3);
        }
      else
        {
          gimp_rgb_multiply (&col2, filter (u));

          col3 = col1;
          gimp_rgb_add (&col3, &col2);
          gimp_rgb_multiply (&col3, 0.5 * step);
          gimp_rgb_add (&col, &col3);
        }
      col1 = col2;
    }
  if (source_drw_has_alpha)
    gimp_rgba_multiply (&col, 1.0 / l);
  else
    gimp_rgb_multiply (&col, 1.0 / l);
  gimp_rgb_clamp (&col);

  *color = col;
}

Example #2

File: rbgimpcolorrgb.c Project: passenger94/Gimp-Ruby

static VALUE
rb_gimp_rgba_add (VALUE self,
                  VALUE other)
{
  GimpRGB result = rb2GimpRGB(self);
  gimp_rgba_add(&result, rb2GimpRGBPtr(other));

  return GimpRGB2rb(&result);
}