示例#1
0
static void
gradient_render_pixel (gdouble   x,
                       gdouble   y,
                       GimpRGB  *color,
                       gpointer  render_data)
{
  RenderBlendData *rbd = render_data;
  gdouble          factor;

  /* Calculate blending factor */

  switch (rbd->gradient_type)
    {
    case GIMP_GRADIENT_LINEAR:
      factor = gradient_calc_linear_factor (rbd->dist,
                                            rbd->vec, rbd->offset,
                                            x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_BILINEAR:
      factor = gradient_calc_bilinear_factor (rbd->dist,
                                              rbd->vec, rbd->offset,
                                              x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_RADIAL:
      factor = gradient_calc_radial_factor (rbd->dist,
                                            rbd->offset,
                                            x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_SQUARE:
      factor = gradient_calc_square_factor (rbd->dist, rbd->offset,
                                            x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_CONICAL_SYMMETRIC:
      factor = gradient_calc_conical_sym_factor (rbd->dist,
                                                 rbd->vec, rbd->offset,
                                                 x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
      factor = gradient_calc_conical_asym_factor (rbd->dist,
                                                  rbd->vec, rbd->offset,
                                                  x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
      factor = gradient_calc_shapeburst_angular_factor (rbd->dist_buffer, x, y);
      break;

    case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
      factor = gradient_calc_shapeburst_spherical_factor (rbd->dist_buffer, x, y);
      break;

    case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
      factor = gradient_calc_shapeburst_dimpled_factor (rbd->dist_buffer, x, y);
      break;

    case GIMP_GRADIENT_SPIRAL_CLOCKWISE:
      factor = gradient_calc_spiral_factor (rbd->dist,
                                            rbd->vec, rbd->offset,
                                            x - rbd->sx, y - rbd->sy, TRUE);
      break;

    case GIMP_GRADIENT_SPIRAL_ANTICLOCKWISE:
      factor = gradient_calc_spiral_factor (rbd->dist,
                                            rbd->vec, rbd->offset,
                                            x - rbd->sx, y - rbd->sy, FALSE);
      break;

    default:
      g_assert_not_reached ();
      return;
    }

  /* Adjust for repeat */

  switch (rbd->repeat)
    {
    case GIMP_REPEAT_NONE:
      factor = CLAMP (factor, 0.0, 1.0);
      break;

    case GIMP_REPEAT_SAWTOOTH:
      factor = factor - floor (factor);
      break;

    case GIMP_REPEAT_TRIANGULAR:
      {
        guint ifactor;

        if (factor < 0.0)
          factor = -factor;

        ifactor = (guint) factor;
        factor = factor - floor (factor);

        if (ifactor & 1)
          factor = 1.0 - factor;
      }
      break;
    }

  /* Blend the colors */

  if (rbd->blend_mode == GIMP_CUSTOM_MODE)
    {
#ifdef USE_GRADIENT_CACHE
      *color = rbd->gradient_cache[(gint) (factor * (rbd->gradient_cache_size - 1))];
#else
      gimp_gradient_get_color_at (rbd->gradient, rbd->context, NULL,
                                  factor, rbd->reverse, color);
#endif
    }
  else
    {
      /* Blend values */

      if (rbd->reverse)
        factor = 1.0 - factor;

      color->r = rbd->fg.r + (rbd->bg.r - rbd->fg.r) * factor;
      color->g = rbd->fg.g + (rbd->bg.g - rbd->fg.g) * factor;
      color->b = rbd->fg.b + (rbd->bg.b - rbd->fg.b) * factor;
      color->a = rbd->fg.a + (rbd->bg.a - rbd->fg.a) * factor;

      if (rbd->blend_mode == GIMP_FG_BG_HSV_MODE)
        {
          GimpHSV hsv = *((GimpHSV *) color);

          gimp_hsv_to_rgb (&hsv, color);
        }
    }
}
示例#2
0
static void
gradient_render_pixel (gdouble   x,
                       gdouble   y,
                       GimpRGB  *color,
                       gpointer  render_data)
{
  RenderBlendData *rbd = render_data;
  gdouble          factor;

  /* Calculate blending factor */

  switch (rbd->gradient_type)
    {
    case GIMP_GRADIENT_LINEAR:
      factor = gradient_calc_linear_factor (rbd->dist,
                                            rbd->vec, rbd->offset,
                                            x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_BILINEAR:
      factor = gradient_calc_bilinear_factor (rbd->dist,
                                              rbd->vec, rbd->offset,
                                              x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_RADIAL:
      factor = gradient_calc_radial_factor (rbd->dist,
                                            rbd->offset,
                                            x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_SQUARE:
      factor = gradient_calc_square_factor (rbd->dist, rbd->offset,
                                            x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_CONICAL_SYMMETRIC:
      factor = gradient_calc_conical_sym_factor (rbd->dist,
                                                 rbd->vec, rbd->offset,
                                                 x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
      factor = gradient_calc_conical_asym_factor (rbd->dist,
                                                  rbd->vec, rbd->offset,
                                                  x - rbd->sx, y - rbd->sy);
      break;

    case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
      factor = gradient_calc_shapeburst_angular_factor (rbd->dist_buffer, x, y);
      break;

    case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
      factor = gradient_calc_shapeburst_spherical_factor (rbd->dist_buffer, x, y);
      break;

    case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
      factor = gradient_calc_shapeburst_dimpled_factor (rbd->dist_buffer, x, y);
      break;

    case GIMP_GRADIENT_SPIRAL_CLOCKWISE:
      factor = gradient_calc_spiral_factor (rbd->dist,
                                            rbd->vec, rbd->offset,
                                            x - rbd->sx, y - rbd->sy, TRUE);
      break;

    case GIMP_GRADIENT_SPIRAL_ANTICLOCKWISE:
      factor = gradient_calc_spiral_factor (rbd->dist,
                                            rbd->vec, rbd->offset,
                                            x - rbd->sx, y - rbd->sy, FALSE);
      break;

    default:
      g_assert_not_reached ();
      return;
    }

  /* Adjust for repeat */

  switch (rbd->repeat)
    {
    case GIMP_REPEAT_TRUNCATE:
      break;
    case GIMP_REPEAT_NONE:
      factor = CLAMP (factor, 0.0, 1.0);
      break;

    case GIMP_REPEAT_SAWTOOTH:
      factor = factor - floor (factor);
      break;

    case GIMP_REPEAT_TRIANGULAR:
      {
        guint ifactor;

        if (factor < 0.0)
          factor = -factor;

        ifactor = (guint) factor;
        factor = factor - floor (factor);

        if (ifactor & 1)
          factor = 1.0 - factor;
      }
      break;
    }

  /* Blend the colors */

  if (factor < 0.0 || factor > 1.0)
    {
      color->r = color->g = color->b = 0;
      color->a = GIMP_OPACITY_TRANSPARENT;
    }
  else
    {
#ifdef USE_GRADIENT_CACHE
      *color = rbd->gradient_cache[(gint) (factor * (rbd->gradient_cache_size - 1))];
#else
      gimp_gradient_get_color_at (rbd->gradient, rbd->context, NULL,
                                  factor, rbd->reverse, color);
#endif
    }
}