C++ RINT函数代码示例

static gboolean
gimp_operation_posterize_process (GeglOperation       *operation,
                                  void                *in_buf,
                                  void                *out_buf,
                                  glong                samples,
                                  const GeglRectangle *roi,
                                  gint                 level)
{
  GimpOperationPointFilter *point  = GIMP_OPERATION_POINT_FILTER (operation);
  GimpPosterizeConfig      *config = GIMP_POSTERIZE_CONFIG (point->config);
  gfloat                   *src    = in_buf;
  gfloat                   *dest   = out_buf;
  gfloat                    levels;

  if (! config)
    return FALSE;

  levels = config->levels - 1.0;

  while (samples--)
    {
      dest[RED]   = RINT (src[RED]   * levels) / levels;
      dest[GREEN] = RINT (src[GREEN] * levels) / levels;
      dest[BLUE]  = RINT (src[BLUE]  * levels) / levels;
      dest[ALPHA] = src[ALPHA];

      src  += 4;
      dest += 4;
    }

  return TRUE;
}

static void
compute_preview_rectangle (gint * xp, gint * yp, gint * wid, gint * heig)
{
  gdouble x, y, w, h;

  if (width >= height)
    {
      w = (PREVIEW_WIDTH - 50.0);
      h = (gdouble) height *(w / (gdouble) width);

      x = (PREVIEW_WIDTH - w) / 2.0;
      y = (PREVIEW_HEIGHT - h) / 2.0;
    }
  else
    {
      h = (PREVIEW_HEIGHT - 50.0);
      w = (gdouble) width *(h / (gdouble) height);
      x = (PREVIEW_WIDTH - w) / 2.0;
      y = (PREVIEW_HEIGHT - h) / 2.0;
    }
  *xp = RINT (x);
  *yp = RINT (y);
  *wid = RINT (w);
  *heig = RINT (h);
}

static gboolean
gimp_operation_posterize_process (GeglOperation       *operation,
                                  void                *in_buf,
                                  void                *out_buf,
                                  glong                samples,
                                  const GeglRectangle *roi,
                                  gint                 level)
{
  GimpOperationPosterize *posterize = GIMP_OPERATION_POSTERIZE (operation);
  gfloat                 *src       = in_buf;
  gfloat                 *dest      = out_buf;
  gfloat                  levels;

  levels = posterize->levels - 1.0;

  while (samples--)
    {
      dest[RED]   = RINT (src[RED]   * levels) / levels;
      dest[GREEN] = RINT (src[GREEN] * levels) / levels;
      dest[BLUE]  = RINT (src[BLUE]  * levels) / levels;
      dest[ALPHA] = RINT (src[ALPHA] * levels) / levels;

      src  += 4;
      dest += 4;
    }

  return TRUE;
}

static void
offset_response (GtkWidget    *widget,
                 gint          response_id,
                 OffsetDialog *dialog)
{
  if (response_id == GTK_RESPONSE_OK)
    {
      GimpImage *image = dialog->image;

      if (image)
        {
          GimpDrawable *drawable = gimp_image_get_active_drawable (image);
          gint          offset_x;
          gint          offset_y;

          offset_x =
            RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (dialog->off_se),
                                              0));
          offset_y =
            RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (dialog->off_se),
                                              1));

          gimp_drawable_offset (drawable,
                                dialog->context,
                                dialog->fill_type & WRAP_AROUND ? TRUE : FALSE,
                                dialog->fill_type & FILL_MASK,
                                offset_x, offset_y);
          gimp_image_flush (image);
        }
    }

  gtk_widget_destroy (dialog->dialog);
}

static void
update_values (void)
{
  GtkWidget *entry;

  entry = g_object_get_data (G_OBJECT (main_dialog), "width");

  grid_cfg.hwidth =
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (entry), 0));
  grid_cfg.vwidth =
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (entry), 1));
  grid_cfg.iwidth =
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (entry), 2));

  entry = g_object_get_data (G_OBJECT (main_dialog), "space");

  grid_cfg.hspace =
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (entry), 0));
  grid_cfg.vspace =
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (entry), 1));
  grid_cfg.ispace =
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (entry), 2));

  entry = g_object_get_data (G_OBJECT (main_dialog), "offset");

  grid_cfg.hoffset =
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (entry), 0));
  grid_cfg.voffset =
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (entry), 1));
  grid_cfg.ioffset =
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (entry), 2));
}

GimpTempBuf *
gimp_drawable_get_sub_preview (GimpDrawable *drawable,
                               gint          src_x,
                               gint          src_y,
                               gint          src_width,
                               gint          src_height,
                               gint          dest_width,
                               gint          dest_height)
{
  GimpItem    *item;
  GimpImage   *image;
  GeglBuffer  *buffer;
  GimpTempBuf *preview;
  gdouble      scale;
  gint         scaled_x;
  gint         scaled_y;

  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
  g_return_val_if_fail (src_x >= 0, NULL);
  g_return_val_if_fail (src_y >= 0, NULL);
  g_return_val_if_fail (src_width  > 0, NULL);
  g_return_val_if_fail (src_height > 0, NULL);
  g_return_val_if_fail (dest_width  > 0, NULL);
  g_return_val_if_fail (dest_height > 0, NULL);

  item = GIMP_ITEM (drawable);

  g_return_val_if_fail ((src_x + src_width)  <= gimp_item_get_width  (item), NULL);
  g_return_val_if_fail ((src_y + src_height) <= gimp_item_get_height (item), NULL);

  image = gimp_item_get_image (item);

  if (! image->gimp->config->layer_previews)
    return NULL;

  buffer = gimp_drawable_get_buffer (drawable);

  preview = gimp_temp_buf_new (dest_width, dest_height,
                               gimp_drawable_get_preview_format (drawable));

  scale = MIN ((gdouble) dest_width  / (gdouble) src_width,
               (gdouble) dest_height / (gdouble) src_height);

  scaled_x = RINT ((gdouble) src_x * scale);
  scaled_y = RINT ((gdouble) src_y * scale);

  gegl_buffer_get (buffer,
                   GEGL_RECTANGLE (scaled_x, scaled_y, dest_width, dest_height),
                   scale,
                   gimp_temp_buf_get_format (preview),
                   gimp_temp_buf_get_data (preview),
                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_CLAMP);

  return preview;
}

static gboolean process (GeglOperation       *operation,
                         void                *in_buf,
                         void                *out_buf,
                         glong                samples,
                         const GeglRectangle *roi,
                         gint                 level)
{
  GeglProperties *o      = GEGL_PROPERTIES (operation);
  gfloat     *src    = in_buf;
  gfloat     *dest   = out_buf;
  gfloat      levels = o->levels;

  while (samples--)
    {
      gint i;
      for (i=0; i < 3; i++)
        dest[i] = RINT (src[i]   * levels) / levels;
      dest[3] = src[3];

      src  += 4;
      dest += 4;
    }

  return TRUE;
}

static Term
p_mod(Term t1, Term t2 USES_REGS) {
  switch (ETypeOfTerm(t1)) {
  case (CELL)long_int_e:
    switch (ETypeOfTerm(t2)) {
    case (CELL)long_int_e:
      /* two integers */
      {
	Int i1 = IntegerOfTerm(t1);
	Int i2 = IntegerOfTerm(t2);
	Int mod;

	if (i2 == 0)
	  return Yap_ArithError(EVALUATION_ERROR_ZERO_DIVISOR, t2, "X is " Int_FORMAT " mod 0", i1);
	if (i1 == Int_MIN && i2 == -1) {
	  return MkIntTerm(0);
	}
	mod = i1%i2;
	if (mod && (mod ^ i2) < 0)
	  mod += i2;
	RINT(mod);
      }
    case (CELL)double_e:
      return Yap_ArithError(TYPE_ERROR_INTEGER, t2, "mod/2");
    case (CELL)big_int_e:
#ifdef USE_GMP
      return Yap_gmp_mod_int_big(IntegerOfTerm(t1), t2);
#endif
    default:
      RERROR();
      break;
    }
  case (CELL)double_e:
    return Yap_ArithError(TYPE_ERROR_INTEGER, t2, "mod/2");
  case (CELL)big_int_e:
#ifdef USE_GMP
    switch (ETypeOfTerm(t2)) {
    case long_int_e:
      /* modulo between bignum and integer */
      {
	Int i2 = IntegerOfTerm(t2);

	if (i2 == 0)
	  return Yap_ArithError(EVALUATION_ERROR_ZERO_DIVISOR, t2, "X is ... mod 0");
	return Yap_gmp_mod_big_int(t1, i2);
      }
    case (CELL)big_int_e:
      /* two bignums */
      return Yap_gmp_mod_big_big(t1, t2);
    case double_e:
      return Yap_ArithError(TYPE_ERROR_INTEGER, t2, "mod/2");
    default:
      RERROR();
    }
#endif
  default:
    RERROR();
  }
}

/**
 * gimp_int_adjustment_update:
 * @adjustment: A #GtkAdjustment.
 * @data:       A pointer to a #gint variable which will store the
 *              @adjustment's value.
 *
 * Note that the #GtkAdjustment's value (which is a #gdouble) will be
 * rounded with RINT().
 **/
void
gimp_int_adjustment_update (GtkAdjustment *adjustment,
                            gpointer       data)
{
  gint *val = (gint *) data;

  *val = RINT (gtk_adjustment_get_value (adjustment));
}

static Term
p_rem(Term t1, Term t2) {
  switch (ETypeOfTerm(t1)) {
  case (CELL)long_int_e:
    switch (ETypeOfTerm(t2)) {
    case (CELL)long_int_e:
      /* two integers */
      {
	Int i1 = IntegerOfTerm(t1);
	Int i2 = IntegerOfTerm(t2);
	Int mod;

	if (i2 == 0) goto zero_divisor;
	if (i1 == Int_MIN && i2 == -1) {
#ifdef USE_GMP
	  return Yap_gmp_add_ints(Int_MAX, 1);	  
#else
	  return Yap_ArithError(EVALUATION_ERROR_INT_OVERFLOW, t1,
		    "rem/2 with %d and %d", i1, i2);
#endif
	}
	mod = i1%i2;
	RINT(i1%i2);
      }
    case (CELL)double_e:
      return Yap_ArithError(TYPE_ERROR_INTEGER, t2, "mod/2");
    case (CELL)big_int_e:
#ifdef USE_GMP
      return Yap_gmp_rem_int_big(IntegerOfTerm(t1), t2);
#endif
    default:
      RERROR();
    }
    break;
  case (CELL)double_e:
    return Yap_ArithError(TYPE_ERROR_INTEGER, t1, "mod/2");
  case (CELL)big_int_e:
#ifdef USE_GMP
    switch (ETypeOfTerm(t2)) {
    case long_int_e:
      return Yap_gmp_rem_big_int(t1, IntegerOfTerm(t2));
    case (CELL)big_int_e:
      /* two bignums */
      return Yap_gmp_rem_big_big(t1, t2);
    case double_e:
      return Yap_ArithError(TYPE_ERROR_INTEGER, t2, "mod/2");
    default:
      RERROR();
    }
#endif
  default:
    RERROR();
  }
 zero_divisor:
  return Yap_ArithError(EVALUATION_ERROR_ZERO_DIVISOR, t2, "X is mod 0");
}

static guchar*
rgb_to_hsl (GimpDrawable     *drawable,
            LICEffectChannel  effect_channel)
{
  guchar       *themap, data[4];
  gint          x, y;
  GimpRGB       color;
  GimpHSL       color_hsl;
  gdouble       val = 0.0;
  glong         maxc, index = 0;
  GimpPixelRgn  region;
  GRand        *gr;

  gr = g_rand_new ();

  maxc = drawable->width * drawable->height;

  gimp_pixel_rgn_init (&region, drawable, border_x, border_y,
                       border_w, border_h, FALSE, FALSE);

  themap = g_new (guchar, maxc);

  for (y = 0; y < region.h; y++)
    {
      for (x = 0; x < region.w; x++)
        {
          data[3] = 255;

          gimp_pixel_rgn_get_pixel (&region, data, x, y);
          gimp_rgba_set_uchar (&color, data[0], data[1], data[2], data[3]);
          gimp_rgb_to_hsl (&color, &color_hsl);

          switch (effect_channel)
            {
            case LIC_HUE:
              val = color_hsl.h * 255;
              break;
            case LIC_SATURATION:
              val = color_hsl.s * 255;
              break;
            case LIC_BRIGHTNESS:
              val = color_hsl.l * 255;
              break;
            }

          /* add some random to avoid unstructured areas. */
          val += g_rand_double_range (gr, -1.0, 1.0);

          themap[index++] = (guchar) CLAMP0255 (RINT (val));
        }
    }

  g_rand_free (gr);

  return themap;
}

/* Normalise the histogram so that it integrates to unity, taking the width of
 * the bins into account.
 * nh       - number of histogram bins
 * h        - histogram
 * binwidth - width of each histogram bin (1/scale)
 *
 * required: nh, h, binwidth
 * modified: h
 */
static void normhist(int nh, double h[], double binwidth, int *psh)
{
	double sh = 0.0;
	int i;
	for(i=0; i<nh; i++)
		sh += h[i];
	for(i=0; i<nh; i++)
		h[i]/= binwidth*sh;
	*psh = RINT(sh);
}

/*
 * Calculate the height and width this video should be displayed in
 */
void CDVDVideoCodecFFmpeg::GetVideoAspect(AVCodecContext* pCodecContext, unsigned int& iWidth, unsigned int& iHeight)
{
  double aspect_ratio;

  /* XXX: use variable in the frame */
  if (pCodecContext->sample_aspect_ratio.num == 0) aspect_ratio = 0;
  else aspect_ratio = av_q2d(pCodecContext->sample_aspect_ratio) * pCodecContext->width / pCodecContext->height;

  if (aspect_ratio <= 0.0) aspect_ratio = (float)pCodecContext->width / (float)pCodecContext->height;

  /* XXX: we suppose the screen has a 1.0 pixel ratio */ // CDVDVideo will compensate it.
  iHeight = pCodecContext->height;
  iWidth = ((int)RINT(pCodecContext->height * aspect_ratio)) & -3;
  if (iWidth > (unsigned int)pCodecContext->width)
  {
    iWidth = pCodecContext->width;
    iHeight = ((int)RINT(pCodecContext->width / aspect_ratio)) & -3;
  }
}

static gint
draw_line (gint        n,
	   gint        startx,
	   gint        starty,
	   gint        pw,
	   gint        ph,
	   gdouble     cx1,
	   gdouble     cy1,
	   gdouble     cx2,
	   gdouble     cy2,
	   GimpVector3 a,
	   GimpVector3 b)
{
  gdouble x1, y1, x2, y2;
  gint    i = n;

  gimp_vector_3d_to_2d (startx, starty, pw, ph,
			&x1, &y1, &mapvals.viewpoint, &a);
  gimp_vector_3d_to_2d (startx, starty, pw, ph,
			&x2, &y2, &mapvals.viewpoint, &b);

  if (clip_line (&x1, &y1, &x2, &y2, cx1, cy1, cx2, cy2) == TRUE)
    {
      linetab[i].x1 = RINT (x1);
      linetab[i].y1 = RINT (y1);
      linetab[i].x2 = RINT (x2);
      linetab[i].y2 = RINT (y2);
      linetab[i].linewidth = 3;
      linetab[i].linestyle = GDK_LINE_SOLID;
      gdk_gc_set_line_attributes (gc,
				  linetab[i].linewidth,
				  linetab[i].linestyle,
				  GDK_CAP_NOT_LAST,
				  GDK_JOIN_MITER);
      gdk_draw_line (previewarea->window, gc,
		     linetab[i].x1, linetab[i].y1,
		     linetab[i].x2, linetab[i].y2);
      i++;
    }

  return i;
}

/* set up lookup table */
static guchar *
gimp_brush_generated_calc_lut (gdouble radius,
                               gdouble hardness)
{
  guchar  *lookup;
  gint     length;
  gint     x;
  gdouble  d;
  gdouble  sum;
  gdouble  exponent;
  gdouble  buffer[OVERSAMPLING];

  length = OVERSAMPLING * ceil (1 + sqrt (2 * SQR (ceil (radius + 1.0))));

  lookup = g_malloc (length);
  sum = 0.0;

  if ((1.0 - hardness) < 0.0000004)
    exponent = 1000000.0;
  else
    exponent = 0.4 / (1.0 - hardness);

  for (x = 0; x < OVERSAMPLING; x++)
    {
      d = fabs ((x + 0.5) / OVERSAMPLING - 0.5);

      if (d > radius)
        buffer[x] = 0.0;
      else
        buffer[x] = gauss (pow (d / radius, exponent));

      sum += buffer[x];
    }

  for (x = 0; d < radius || sum > 0.00001; d += 1.0 / OVERSAMPLING)
    {
      sum -= buffer[x % OVERSAMPLING];

      if (d > radius)
        buffer[x % OVERSAMPLING] = 0.0;
      else
        buffer[x % OVERSAMPLING] = gauss (pow (d / radius, exponent));

      sum += buffer[x % OVERSAMPLING];
      lookup[x++] = RINT (sum * (255.0 / OVERSAMPLING));
    }

  while (x < length)
    {
      lookup[x++] = 0;
    }

  return lookup;
}