gdkcolor-x11.c

linux下电话本所依赖的一些图形库

      for (i = 0; i < size; i++)
	{
	  palette[i].pixel = i << shift;
	  palette[i].red = colormap->colors[i].red;
	  palette[i].flags = DoRed;
	}

      XStoreColors (xdisplay, private->xcolormap, palette, size);

      shift = visual->green_shift;
      max_colors = 1 << visual->green_prec;
      size = (ncolors < max_colors) ? (ncolors) : (max_colors);

      for (i = 0; i < size; i++)
	{
	  palette[i].pixel = i << shift;
	  palette[i].green = colormap->colors[i].green;
	  palette[i].flags = DoGreen;
	}

      XStoreColors (xdisplay, private->xcolormap, palette, size);

      shift = visual->blue_shift;
      max_colors = 1 << visual->blue_prec;
      size = (ncolors < max_colors) ? (ncolors) : (max_colors);

      for (i = 0; i < size; i++)
	{
	  palette[i].pixel = i << shift;
	  palette[i].blue = colormap->colors[i].blue;
	  palette[i].flags = DoBlue;
	}

      XStoreColors (xdisplay, private->xcolormap, palette, size);
      break;

    default:
      break;
    }

  g_free (palette);
}

/**
 * gdk_colors_alloc:
 * @colormap: a #GdkColormap.
 * @contiguous: if %TRUE, the colors should be allocated
 *    in contiguous color cells.
 * @planes: an array in which to store the plane masks.
 * @nplanes: the number of planes to allocate. (Or zero,
 *    to indicate that the color allocation should not be planar.)
 * @pixels: an array into which to store allocated pixel values.
 * @npixels: the number of pixels in each plane to allocate.
 * 
 * Allocates colors from a colormap. This function
 * is obsolete. See gdk_colormap_alloc_colors().
 * For full documentation of the fields, see 
 * the Xlib documentation for <function>XAllocColorCells()</function>.
 * 
 * Return value: 
 **/
gboolean
gdk_colors_alloc (GdkColormap   *colormap,
		  gboolean       contiguous,
		  gulong        *planes,
		  gint           nplanes,
		  gulong        *pixels,
		  gint           npixels)
{
  GdkColormapPrivateX11 *private;
  gint return_val;
  gint i;

  g_return_val_if_fail (GDK_IS_COLORMAP (colormap), FALSE);

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  if (private->screen->closed)
    return FALSE;

  return_val = XAllocColorCells (GDK_SCREEN_XDISPLAY (private->screen),
				 private->xcolormap,contiguous, planes,
				 nplanes, pixels, npixels);
  if (return_val)
    {
      for (i = 0; i < npixels; i++)
	{
	  private->info[pixels[i]].ref_count++;
	  private->info[pixels[i]].flags |= GDK_COLOR_WRITEABLE;
	}
    }

  return return_val != 0;
}

/* This is almost identical to gdk_colormap_free_colors.
 * Keep them in sync!
 */


/**
 * gdk_colors_free:
 * @colormap: a #GdkColormap.
 * @pixels: the pixel values of the colors to free.
 * @npixels: the number of values in @pixels.
 * @planes: the plane masks for all planes to free, OR'd together.
 * 
 * Frees colors allocated with gdk_colors_alloc(). This
 * function is obsolete. See gdk_colormap_free_colors().
 **/
void
gdk_colors_free (GdkColormap *colormap,
		 gulong      *pixels,
		 gint         npixels,
		 gulong       planes)
{
  GdkColormapPrivateX11 *private;
  gulong *pixels_to_free;
  gint npixels_to_free = 0;
  gint i;

  g_return_if_fail (GDK_IS_COLORMAP (colormap));
  g_return_if_fail (pixels != NULL);

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  if ((colormap->visual->type != GDK_VISUAL_PSEUDO_COLOR) &&
      (colormap->visual->type != GDK_VISUAL_GRAYSCALE))
    return;
  
  pixels_to_free = g_new (gulong, npixels);

  for (i = 0; i < npixels; i++)
    {
      gulong pixel = pixels[i];
      
      if (private->info[pixel].ref_count)
	{
	  private->info[pixel].ref_count--;

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

  if (npixels_to_free && !private->private_val && !private->screen->closed)
    XFreeColors (GDK_SCREEN_XDISPLAY (private->screen), private->xcolormap,
		 pixels_to_free, npixels_to_free, planes);
  g_free (pixels_to_free);
}

/* This is almost identical to gdk_colors_free.
 * Keep them in sync!
 */

/**
 * gdk_colormap_free_colors:
 * @colormap: a #GdkColormap.
 * @colors: the colors to free.
 * @ncolors: the number of colors in @colors.
 * 
 * Frees previously allocated colors.
 **/
void
gdk_colormap_free_colors (GdkColormap *colormap,
			  GdkColor    *colors,
			  gint         ncolors)
{
  GdkColormapPrivateX11 *private;
  gulong *pixels;
  gint npixels = 0;
  gint i;

  g_return_if_fail (GDK_IS_COLORMAP (colormap));
  g_return_if_fail (colors != NULL);

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  if ((colormap->visual->type != GDK_VISUAL_PSEUDO_COLOR) &&
      (colormap->visual->type != GDK_VISUAL_GRAYSCALE))
    return;

  pixels = g_new (gulong, ncolors);

  for (i = 0; i < ncolors; i++)
    {
      gulong pixel = colors[i].pixel;
      
      if (private->info[pixel].ref_count)
	{
	  private->info[pixel].ref_count--;

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

  if (npixels && !private->private_val && !private->screen->closed)
    XFreeColors (GDK_SCREEN_XDISPLAY (private->screen), private->xcolormap,
		 pixels, npixels, 0);

  g_free (pixels);
}

/********************
 * Color allocation *
 ********************/

/* Try to allocate a single color using XAllocColor. If it succeeds,
 * cache the result in our colormap, and store in ret.
 */
static gboolean 
gdk_colormap_alloc1 (GdkColormap *colormap,
		     GdkColor    *color,
		     GdkColor    *ret)
{
  GdkColormapPrivateX11 *private;
  XColor xcolor;

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  xcolor.red = color->red;
  xcolor.green = color->green;
  xcolor.blue = color->blue;
  xcolor.pixel = color->pixel;
  xcolor.flags = DoRed | DoGreen | DoBlue;

  if (XAllocColor (GDK_SCREEN_XDISPLAY (private->screen), private->xcolormap, &xcolor))
    {
      ret->pixel = xcolor.pixel;
      ret->red = xcolor.red;
      ret->green = xcolor.green;
      ret->blue = xcolor.blue;
      
      if (ret->pixel < colormap->size)
	{
	  if (private->info[ret->pixel].ref_count) /* got a duplicate */
	    {
	      XFreeColors (GDK_SCREEN_XDISPLAY (private->screen), private->xcolormap,
			   &xcolor.pixel, 1, 0);
	      private->info[ret->pixel].ref_count++;
	    }
	  else
	    {
	      colormap->colors[ret->pixel] = *color;
	      colormap->colors[ret->pixel].pixel = ret->pixel;
	      private->info[ret->pixel].ref_count = 1;

	      g_hash_table_insert (private->hash,
				   &colormap->colors[ret->pixel],
				   &colormap->colors[ret->pixel]);
	    }
	}
      return TRUE;
    }
  else
    {
      return FALSE;
    }
}

static gint
gdk_colormap_alloc_colors_writeable (GdkColormap *colormap,
				     GdkColor    *colors,
				     gint         ncolors,
				     gboolean     writeable,
				     gboolean     best_match,
				     gboolean    *success)
{
  GdkColormapPrivateX11 *private;
  gulong *pixels;
  Status status;
  gint i, index;

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  if (private->private_val)
    {
      index = 0;
      for (i = 0; i < ncolors; i++)
	{
	  while ((index < colormap->size) && (private->info[index].ref_count != 0))
	    index++;
	  
	  if (index < colormap->size)
	    {
	      colors[i].pixel = index;
	      success[i] = TRUE;
	      private->info[index].ref_count++;
	      private->info[i].flags |= GDK_COLOR_WRITEABLE;
	    }
	  else
	    break;
	}
      return ncolors - i;
    }
  else
    {
      pixels = g_new (gulong, ncolors);
      /* Allocation of a writeable color cells */
      
      status =  XAllocColorCells (GDK_SCREEN_XDISPLAY (private->screen), private->xcolormap,
				  FALSE, NULL, 0, pixels, ncolors);
      if (status)
	{
	  for (i = 0; i < ncolors; i++)
	    {
	      colors[i].pixel = pixels[i];
	      success[i] = TRUE;
	      private->info[pixels[i]].ref_count++;
	      private->info[pixels[i]].flags |= GDK_COLOR_WRITEABLE;
	    }
	}
      
      g_free (pixels);

      return status ? 0 : ncolors; 
    }
}

static gint
gdk_colormap_alloc_colors_private (GdkColormap *colormap,
				   GdkColor    *colors,
				   gint         ncolors,
				   gboolean     writeable,
				   gboolean     best_match,
				   gboolean    *success)
{
  GdkColormapPrivateX11 *private;
  gint i, index;
  XColor *store = g_new (XColor, ncolors);
  gint nstore = 0;
  gint nremaining = 0;
  
  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  /* First, store the colors we have room for */

  index = 0;
  for (i = 0; i < ncolors; i++)
    {
      if (!success[i])
	{
	  while ((index < colormap->size) && (private->info[index].ref_count != 0))
	    index++;

	  if (index < colormap->size)
	    {
	      store[nstore].red = colors[i].red;
	      store[nstore].blue = colors[i].blue;
	      store[nstore].green = colors[i].green;
	      store[nstore].pixel = index;
	      store[nstore].flags = DoRed | DoGreen | DoBlue;
	      nstore++;

	      success[i] = TRUE;
	      colors[i].pixel = index;

	      colormap->colors[index] = colors[i];
	      private->info[index].ref_count++;

	      g_hash_table_insert (private->hash,
				   &colormap->colors[index],
				   &colormap->colors[index]);
	    }
	  else
	    nremaining++;
	}
    }
  
  XStoreColors (GDK_SCREEN_XDISPLAY (private->screen), private->xcolormap,
		store, nstore);
  g_free (store);

  if (nremaining > 0 && best_match)
    {
      /* Get best matches for remaining colors */

      gchar *available = g_new (gchar, colormap->size);
      for (i = 0; i < colormap->size; i++)
	available[i] = !(private->info[i].flags & GDK_COLOR_WRITEABLE);

      for (i = 0; i < ncolors; i++)
	{
	  if (!success[i])
	    {
	      index = gdk_colormap_match_color (colormap, 
						&colors[i], 
						available);
	      if (index != -1)
		{
		  colors[i] = colormap->colors[index];
		  private->info[index].ref_count++;

		  success[i] = TRUE;
		  nremaining--;
		}
	    }
	}
      g_free (available);
    }

  return nremaining;
}

static gint
gdk_colormap_alloc_colors_shared (GdkColormap *colormap,
				  GdkColor    *colors,
				  gint         ncolors,
				  gboolean     writeable,
				  gboolean     best_match,
				  gboolean    *success)
{
  GdkColormapPrivateX11 *private;
  gint i, index;
  gint nremaining = 0;
  gint nfailed = 0;

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  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));
      gdk_colormap_sync (colormap, FALSE);
      
      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 nremaining;
}

static gint
gdk_colormap_alloc_colors_pseudocolor (GdkColormap *colormap,
				       GdkColor    *colors,
				       gint         ncolors,