gdkcolor-fb.c

linux下电话本所依赖的一些图形库

      && colormap->visual->type != GDK_VISUAL_PSEUDO_COLOR)
    return FALSE;

  *ret = *color;
  
  gdk_fb_color_round_to_hw (ret);

  for (i = 0; i<colormap->size; i++)
    {
      if (!(private->info[i].flags & GDK_COLOR_WRITEABLE) &&
	  (ret->red == colormap->colors[i].red) &&
	  (ret->green == colormap->colors[i].green) &&
	  (ret->blue == colormap->colors[i].blue))
	{
	  ret->pixel = i;
	  colormap->colors[i].pixel = i;
	  if (private->info[i].ref_count == 0)
	    g_hash_table_insert (private->hash,
				 &colormap->colors[ret->pixel],
				 &colormap->colors[ret->pixel]);
	  private->info[i].ref_count++;
	  return TRUE;
	}
    }

  for (i = 0; i<colormap->size; i++)
    {
      if (private->info[i].ref_count==0)
	{
	  guint16 red = color->red, green = color->green, blue = color->blue;
	  struct fb_cmap fbc;
	  
	  fbc.len = 1;
	  fbc.start = i;
	  fbc.red = &red;
	  fbc.green = &green;
	  fbc.blue = &blue;

	  ioctl (gdk_display->fb_fd, FBIOPUTCMAP, &fbc);

	  ret->pixel = i;
	  colormap->colors[ret->pixel] = *ret;
	  private->info[ret->pixel].ref_count = 1;
	  g_hash_table_insert (private->hash,
			       &colormap->colors[ret->pixel],
			       &colormap->colors[ret->pixel]);
	  return TRUE;
	}
    }
      
  return FALSE;
}

static gint
gdk_colormap_alloc_colors_shared (GdkColormap *colormap,
				  GdkColor    *colors,
				  gint         ncolors,
				  gboolean     writeable,
				  gboolean     best_match,
				  gboolean    *success)
{
  GdkColormapPrivateFB *private;
  gint i, index;
  gint nremaining = 0;
  gint nfailed = 0;

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);
  index = -1;

  for (i = 0; i < ncolors; i++)
    {
      if (!success[i])
	{
	  if (gdk_colormap_alloc1 (colormap, &colors[i], &colors[i]))
	    success[i] = TRUE;
	  else
	    nremaining++;
	}
    }


  if (nremaining > 0 && best_match)
    {
      gchar *available = g_new (gchar, colormap->size);

      for (i = 0; i < colormap->size; i++)
	available[i] = ((private->info[i].ref_count == 0) ||
			!(private->info[i].flags & GDK_COLOR_WRITEABLE));
      
      while (nremaining > 0)
	{
	  for (i = 0; i < ncolors; i++)
	    {
	      if (!success[i])
		{
		  index = gdk_colormap_match_color (colormap, &colors[i], available);
		  if (index != -1)
		    {
		      if (private->info[index].ref_count)
			{
			  private->info[index].ref_count++;
			  colors[i] = colormap->colors[index];
			  success[i] = TRUE;
			  nremaining--;
			}
		      else
			{
			  if (gdk_colormap_alloc1 (colormap, 
						   &colormap->colors[index],
						   &colors[i]))
			    {
			      success[i] = TRUE;
			      nremaining--;
			      break;
			    }
			  else
			    {
			      available[index] = FALSE;
			    }
			}
		    }
		  else
		    {
		      nfailed++;
		      nremaining--;
		      success[i] = 2; /* flag as permanent failure */
		    }
		}
	    }
	}
      g_free (available);
    }

  /* Change back the values we flagged as permanent failures */
  if (nfailed > 0)
    {
      for (i = 0; i < ncolors; i++)
	if (success[i] == 2)
	  success[i] = FALSE;
      nremaining = nfailed;
    }
  
  return (ncolors - nremaining);
}

static gint
gdk_colormap_alloc_colors_pseudocolor (GdkColormap *colormap,
				       GdkColor    *colors,
				       gint         ncolors,
				       gboolean     writeable,
				       gboolean     best_match,
				       gboolean    *success)
{
  GdkColormapPrivateFB *private;
  GdkColor *lookup_color;
  gint i;
  gint nremaining = 0;

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  /* Check for an exact match among previously allocated colors */

  for (i = 0; i < ncolors; i++)
    {
      if (!success[i])
	{
	  lookup_color = g_hash_table_lookup (private->hash, &colors[i]);
	  if (lookup_color)
	    {
	      private->info[lookup_color->pixel].ref_count++;
	      colors[i].pixel = lookup_color->pixel;
	      success[i] = TRUE;
	    }
	  else
	    nremaining++;
	}
    }

  /* If that failed, we try to allocate a new color, or approxmiate
   * with what we can get if best_match is TRUE.
   */
  if (nremaining > 0)
    return gdk_colormap_alloc_colors_shared (colormap, colors, ncolors, writeable, best_match, success);
  else
    return 0;
}

gint
gdk_colormap_alloc_colors (GdkColormap *colormap,
			   GdkColor    *colors,
			   gint         ncolors,
			   gboolean     writeable,
			   gboolean     best_match,
			   gboolean    *success)
{
  GdkColormapPrivateFB *private;
  GdkVisual *visual;
  gint i;
  gint nremaining = 0;

  g_return_val_if_fail (colormap != NULL, FALSE);
  g_return_val_if_fail (colors != NULL, FALSE);

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  for (i = 0; i < ncolors; i++)
    success[i] = FALSE;

  visual = colormap->visual;
  switch (visual->type)
    {
    case GDK_VISUAL_PSEUDO_COLOR:
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_STATIC_GRAY:
    case GDK_VISUAL_STATIC_COLOR:
      return gdk_colormap_alloc_colors_pseudocolor (colormap, colors, ncolors,
						    writeable, best_match, success);
      break;

    case GDK_VISUAL_DIRECT_COLOR:
    case GDK_VISUAL_TRUE_COLOR:
      for (i = 0; i < ncolors; i++)
	{
	  colors[i].pixel = (((colors[i].red >> (16 - visual->red_prec)) << visual->red_shift) +
			     ((colors[i].green >> (16 - visual->green_prec)) << visual->green_shift) +
			     ((colors[i].blue >> (16 - visual->blue_prec)) << visual->blue_shift));
	  success[i] = TRUE;
	}
      break;
    }
  return nremaining;
}

gboolean
gdk_color_change (GdkColormap *colormap,
		  GdkColor    *color)
{
  GdkColormapPrivateFB *private;
  struct fb_cmap fbc = {0, 1};

  g_return_val_if_fail (colormap != NULL, FALSE);
  g_return_val_if_fail (color != NULL, FALSE);

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  switch(colormap->visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
      color->red = color->green = color->blue = (color->red + color->green + color->blue)/3;

      /* Fall through */
    case GDK_VISUAL_PSEUDO_COLOR:
      colormap->colors[color->pixel] = *color;
      
      fbc.start = color->pixel;
      fbc.red = &color->red;
      fbc.green = &color->green;
      fbc.blue = &color->blue;
      ioctl (gdk_display->fb_fd, FBIOPUTCMAP, &fbc);
      break;

    default:
      break;
    }

  return TRUE;
}

static gint
gdk_colormap_match_color (GdkColormap *cmap,
			  GdkColor    *color,
			  const gchar *available)
{
  GdkColor *colors;
  guint sum, max;
  gint rdiff, gdiff, bdiff;
  gint i, index;

  g_return_val_if_fail (cmap != NULL, 0);
  g_return_val_if_fail (color != NULL, 0);

  colors = cmap->colors;
  max = 3 * (65536);
  index = -1;

  for (i = 0; i < cmap->size; i++)
    {
      if ((!available) || (available && available[i]))
	{
	  rdiff = (color->red - colors[i].red);
	  gdiff = (color->green - colors[i].green);
	  bdiff = (color->blue - colors[i].blue);

	  sum = ABS (rdiff) + ABS (gdiff) + ABS (bdiff);

	  if (sum < max)
	    {
	      index = i;
	      max = sum;
	    }
	}
    }

  return index;
}

gboolean
gdk_colors_alloc (GdkColormap	*colormap,
		  gboolean 	 contiguous,
		  gulong	*planes,
		  gint		 nplanes,
		  gulong	*pixels,
		  gint		 npixels)
{
  GdkColormapPrivateFB *private;
  gint found, i, col;

  g_return_val_if_fail (colormap != NULL, FALSE);

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);
  
  if (nplanes > 0)
    return FALSE;

  found = 0;
  for (i = 1; i < colormap->size; i++)
    {
      if (private->info[i].ref_count == 0)
	{
	  found++;
	  if (found >= npixels)
	    break;
	}
    }

  if (found < npixels)
    return FALSE;

  col = 0;
  for (i = 1; i < colormap->size; i++)
    {
      if (private->info[i].ref_count == 0)
	{
	  pixels[col++] = i;
	  private->info[i].ref_count++;
	  private->info[i].flags |= GDK_COLOR_WRITEABLE;
	  if (col == npixels)
	    return TRUE;
	}
    }

  g_assert_not_reached ();
  return FALSE;
}

void
gdk_colors_free	(GdkColormap	*colormap,
		 gulong		*pixels,
		 gint		 npixels,
		 gulong	 	 planes)
{
  GdkColormapPrivateFB *private;
  gint i, pixel;

  g_return_if_fail (colormap != NULL);

  if ((colormap->visual->type != GDK_VISUAL_PSEUDO_COLOR) &&
      (colormap->visual->type != GDK_VISUAL_GRAYSCALE))
    return;
  
  private = GDK_COLORMAP_PRIVATE_DATA (colormap);
  
  for (i = 0; i < npixels; i++)
    {
      pixel = pixels[i];
      
      if (private->info[pixel].ref_count)
	{
	  private->info[pixel].ref_count--;

	  if (private->info[pixel].ref_count == 0)
	    {
	      if (!(private->info[pixel].flags & GDK_COLOR_WRITEABLE))
		g_hash_table_remove (private->hash, &colormap->colors[pixel]);
	      private->info[pixel].flags = 0;
	    }
	}
    }
}


void
gdk_colormap_query_color (GdkColormap *colormap,
			  gulong       pixel,
			  GdkColor    *result)
{
  GdkVisual *visual;

  g_return_if_fail (GDK_IS_COLORMAP (colormap));
  
  visual = gdk_colormap_get_visual (colormap);

  switch (visual->type)
    {
    case GDK_VISUAL_DIRECT_COLOR:
    case GDK_VISUAL_TRUE_COLOR:
      result->red = 65535. * (gdouble) ((pixel & visual->red_mask) >> visual->red_shift) / ((1 << visual->red_prec) - 1);
      result->green = 65535. * (gdouble) ((pixel & visual->green_mask) >> visual->green_shift) / ((1 << visual->green_prec) - 1);
      result->blue = 65535. * (gdouble) ((pixel & visual->blue_mask) >> visual->blue_shift) / ((1 << visual->blue_prec) - 1);
      break;
    case GDK_VISUAL_STATIC_GRAY:
    case GDK_VISUAL_GRAYSCALE:
      result->red = result->green = result->blue = 65535. * (double)pixel/((1<<visual->depth) - 1);
      break;
    case GDK_VISUAL_PSEUDO_COLOR:
      result->red = colormap->colors[pixel].red;
      result->green = colormap->colors[pixel].green;
      result->blue = colormap->colors[pixel].blue;
      break;
    default:
      g_assert_not_reached ();
      break;
    }
}

GdkScreen*
gdk_colormap_get_screen (GdkColormap *cmap)
{
  g_return_val_if_fail (cmap != NULL, NULL);

  return gdk_screen_get_default ();
}