gdkcolor-x11.c

linux下电话本所依赖的一些图形库

				       gboolean     writeable,
				       gboolean     best_match,
				       gboolean    *success)
{
  GdkColormapPrivateX11 *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)
    {
      if (private->private_val)
	return gdk_colormap_alloc_colors_private (colormap, colors, ncolors, writeable, best_match, success);
      else
	return gdk_colormap_alloc_colors_shared (colormap, colors, ncolors, writeable, best_match, success);
    }
  else
    return 0;
}

/**
 * gdk_colormap_alloc_colors:
 * @colormap: a #GdkColormap.
 * @colors: The color values to allocate. On return, the pixel
 *    values for allocated colors will be filled in.
 * @ncolors: The number of colors in @colors.
 * @writeable: If %TRUE, the colors are allocated writeable
 *    (their values can later be changed using gdk_color_change()).
 *    Writeable colors cannot be shared between applications.
 * @best_match: If %TRUE, GDK will attempt to do matching against
 *    existing colors if the colors cannot be allocated as requested.
 * @success: An array of length @ncolors. On return, this
 *   indicates whether the corresponding color in @colors was
 *   successfully allocated or not.
 * 
 * Allocates colors from a colormap.
 * 
 * Return value: The number of colors that were not successfully 
 * allocated.
 **/
gint
gdk_colormap_alloc_colors (GdkColormap *colormap,
			   GdkColor    *colors,
			   gint         ncolors,
			   gboolean     writeable,
			   gboolean     best_match,
			   gboolean    *success)
{
  GdkColormapPrivateX11 *private;
  GdkVisual *visual;
  gint i;
  gint nremaining = 0;
  XColor xcolor;

  g_return_val_if_fail (GDK_IS_COLORMAP (colormap), ncolors);
  g_return_val_if_fail (colors != NULL, ncolors);
  g_return_val_if_fail (success != NULL, ncolors);

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

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

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

  switch (colormap->visual->type)
    {
    case GDK_VISUAL_PSEUDO_COLOR:
    case GDK_VISUAL_GRAYSCALE:
      if (writeable)
	return gdk_colormap_alloc_colors_writeable (colormap, colors, ncolors,
						    writeable, best_match, success);
      else
	return gdk_colormap_alloc_colors_pseudocolor (colormap, colors, ncolors,
						    writeable, best_match, success);
      break;

    case GDK_VISUAL_DIRECT_COLOR:
    case GDK_VISUAL_TRUE_COLOR:
      visual = colormap->visual;

      for (i = 0; i < ncolors; i++)
	{
	  /* If bits not used for color are used for something other than padding,
	   * it's likely alpha, so we set them to 1s.
	   */
	  guint32 unused = ~ (visual->red_mask | visual->green_mask | visual->blue_mask |
			      (((~(guint32)0)) << visual->depth));
	  colors[i].pixel = (unused +
			     ((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;
    case GDK_VISUAL_STATIC_GRAY:
    case GDK_VISUAL_STATIC_COLOR:
      for (i = 0; i < ncolors; i++)
	{
	  xcolor.red = colors[i].red;
	  xcolor.green = colors[i].green;
	  xcolor.blue = colors[i].blue;
	  xcolor.pixel = colors[i].pixel;
	  xcolor.flags = DoRed | DoGreen | DoBlue;

	  if (XAllocColor (GDK_SCREEN_XDISPLAY (private->screen), private->xcolormap, &xcolor))
	    {
	      colors[i].pixel = xcolor.pixel;
	      success[i] = TRUE;
	    }
	  else
	    nremaining++;
	}
      break;
    }
  return nremaining;
}

/**
 * gdk_colormap_query_color:
 * @colormap: a #GdkColormap
 * @pixel: pixel value in hardware display format
 * @result: #GdkColor with red, green, blue fields initialized
 * 
 * Locates the RGB color in @colormap corresponding to the given
 * hardware pixel @pixel. @pixel must be a valid pixel in the
 * colormap; it's a programmer error to call this function with a
 * pixel which is not in the colormap. Hardware pixels are normally
 * obtained from gdk_colormap_alloc_colors(), or from a #GdkImage. (A
 * #GdkImage contains image data in hardware format, a #GdkPixbuf
 * contains image data in a canonical 24-bit RGB format.)
 *
 * This function is rarely useful; it's used for example to
 * implement the eyedropper feature in #GtkColorSelection.
 * 
 **/
void
gdk_colormap_query_color (GdkColormap *colormap,
			  gulong       pixel,
			  GdkColor    *result)
{
  XColor xcolor;
  GdkVisual *visual;
  GdkColormapPrivateX11 *private;
  
  g_return_if_fail (GDK_IS_COLORMAP (colormap));
  
  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  visual = gdk_colormap_get_visual (colormap);

  switch (visual->type) {
  case GDK_VISUAL_DIRECT_COLOR:
  case GDK_VISUAL_TRUE_COLOR:
    result->red = 65535. * (double)((pixel & visual->red_mask) >> visual->red_shift) / ((1 << visual->red_prec) - 1);
    result->green = 65535. * (double)((pixel & visual->green_mask) >> visual->green_shift) / ((1 << visual->green_prec) - 1);
    result->blue = 65535. * (double)((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_STATIC_COLOR:
    xcolor.pixel = pixel;
    if (!private->screen->closed)
      {
	XQueryColor (GDK_SCREEN_XDISPLAY (private->screen), private->xcolormap, &xcolor);
	result->red = xcolor.red;
	result->green = xcolor.green;
	result->blue =  xcolor.blue;
      }
    else
      result->red = result->green = result->blue = 0;
    break;
  case GDK_VISUAL_PSEUDO_COLOR:
    g_return_if_fail (pixel < colormap->size);
    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;
  }
}

/**
 * gdk_color_change:
 * @colormap: a #GdkColormap.
 * @color: a #GdkColor, with the color to change
 * in the <structfield>pixel</structfield> field,
 * and the new value in the remaining fields.
 * 
 * Changes the value of a color that has already
 * been allocated. If @colormap is not a private
 * colormap, then the color must have been allocated
 * using gdk_colormap_alloc_colors() with the 
 * @writeable set to %TRUE.
 * 
 * Return value: %TRUE if the color was successfully changed.
 **/
gboolean
gdk_color_change (GdkColormap *colormap,
		  GdkColor    *color)
{
  GdkColormapPrivateX11 *private;
  XColor xcolor;

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

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

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);
  if (!private->screen->closed)
    XStoreColor (GDK_SCREEN_XDISPLAY (private->screen), private->xcolormap, &xcolor);

  return TRUE;
}

/**
 * gdk_x11_colormap_foreign_new:
 * @visual: a #GdkVisual
 * @xcolormap: The XID of a colormap with visual @visual
 * 
 * If xcolormap refers to a colormap previously known to GTK+,
 * returns a new reference to the existing #GdkColormap object,
 * otherwise creates a new GdkColormap object and returns that
 *
 * Return value: the #GdkColormap object for @xcolormap.
 *   Free with g_object_unref(). Note that for colormap created
 *   with gdk_x11_colormap_foreign_new(), unref'ing the last
 *   reference to the object will only free the #GdkColoramp
 *   object and not call XFreeColormap()
 *
 * Since: 2.2
 **/
GdkColormap *
gdk_x11_colormap_foreign_new (GdkVisual *visual,
			      Colormap   xcolormap)
{
  GdkColormap *colormap;
  GdkScreen *screen;
  GdkColormapPrivateX11 *private;
  
  g_return_val_if_fail (GDK_IS_VISUAL (visual), NULL);
  g_return_val_if_fail (xcolormap != None, NULL);

  screen = gdk_visual_get_screen (visual);
  
  if (xcolormap == DefaultColormap (GDK_SCREEN_XDISPLAY (screen),
				    GDK_SCREEN_XNUMBER (screen)))
    return g_object_ref (gdk_screen_get_system_colormap (screen));

  colormap = gdk_colormap_lookup (screen, xcolormap);
  if (colormap)
    return g_object_ref (colormap);

  colormap = g_object_new (GDK_TYPE_COLORMAP, NULL);
  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  colormap->visual = visual;

  private->screen = screen;
  private->xcolormap = xcolormap;
  private->private_val = FALSE;

  colormap->size = visual->colormap_size;

  switch (colormap->visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_PSEUDO_COLOR:
      private->info = g_new0 (GdkColorInfo, colormap->size);
      private->hash = g_hash_table_new ((GHashFunc) gdk_color_hash,
					(GEqualFunc) gdk_color_equal);
      /* Fall through */
    case GDK_VISUAL_STATIC_GRAY:
    case GDK_VISUAL_STATIC_COLOR:
    case GDK_VISUAL_DIRECT_COLOR:
      colormap->colors = g_new (GdkColor, colormap->size);
      gdk_colormap_sync (colormap, TRUE);
      
    case GDK_VISUAL_TRUE_COLOR:
      break;
    }

  gdk_colormap_add (colormap);

  return colormap;
  
}

/**
 * gdkx_colormap_get:
 * @xcolormap: the XID of a colormap for the default screen.
 * 
 * Returns a #GdkColormap corresponding to a X colormap;
 * this function only works if the colormap is already
 * known to GTK+ (a colormap created by GTK+ or the default
 * colormap for the screen), since GTK+ 
 *
 * Always use gdk_x11_colormap_foreign_new() instead.
 *
 * Return value: the existing #GdkColormap object if it was
 *  already known to GTK+, otherwise warns and return
 *  %NULL.
 **/
GdkColormap*
gdkx_colormap_get (Colormap xcolormap)
{
  GdkScreen *screen = gdk_screen_get_default ();
  GdkColormap *colormap;

  if (xcolormap == DefaultColormap (GDK_SCREEN_XDISPLAY (screen),
				    GDK_SCREEN_XNUMBER (screen)));
    return g_object_ref (gdk_screen_get_system_colormap (screen));

  colormap = gdk_colormap_lookup (screen, xcolormap);
  if (colormap)
    return g_object_ref (colormap);

  g_warning ("Colormap passed to gdkx_colormap_get\n"
	     "does not previously exist");

  return NULL;
}

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;

  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;
}


static GdkColormap*
gdk_colormap_lookup (GdkScreen *screen,
		     Colormap   xcolormap)
{
  GdkScreenX11 *screen_x11 = GDK_SCREEN_X11 (screen);

  if (screen_x11->colormap_hash)
    return g_hash_table_lookup (screen_x11->colormap_hash, &xcolormap);
  else
    return NULL;
}

static void
gdk_colormap_add (GdkColormap *cmap)
{
  GdkScreenX11 *screen_x11;
  GdkColormapPrivateX11 *private;

  private = GDK_COLORMAP_PRIVATE_DATA (cmap);
  screen_x11 = GDK_SCREEN_X11 (private->screen);

  if (!screen_x11->colormap_hash)
    screen_x11->colormap_hash = g_hash_table_new ((GHashFunc) gdk_colormap_hash,
						  (GEqualFunc) gdk_colormap_equal);

  g_hash_table_insert (screen_x11->colormap_hash, &private->xcolormap, cmap);
}

static void
gdk_colormap_remove (GdkColormap *cmap)
{
  GdkScreenX11 *screen_x11;
  GdkColormapPrivateX11 *private;

  private = GDK_COLORMAP_PRIVATE_DATA (cmap);
  screen_x11 = GDK_SCREEN_X11 (private->screen);

  if (screen_x11->colormap_hash)
    g_hash_table_remove (screen_x11->colormap_hash, &private->xcolormap);
}

static guint
gdk_colormap_hash (Colormap *colormap)
{
  return *colormap;
}

static gboolean
gdk_colormap_equal (Colormap *a,
		    Colormap *b)
{
  return (*a == *b);
}

/**
 * gdk_x11_colormap_get_xdisplay:
 * @colormap: a #GdkColormap.
 * 
 * Returns the display of a #GdkColormap.
 * 
 * Return value: an Xlib <type>Display*</type>.
 **/
Display *
gdk_x11_colormap_get_xdisplay (GdkColormap *colormap)
{
  GdkColormapPrivateX11 *private;

  g_return_val_if_fail (GDK_IS_COLORMAP (colormap), NULL);

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  return GDK_SCREEN_XDISPLAY (private->screen);
}

/**
 * gdk_x11_colormap_get_xcolormap:
 * @colormap:  a #GdkColormap.
 * 
 * Returns the X colormap belonging to a #GdkColormap.
 * 
 * Return value: an Xlib <type>Colormap</type>.
 **/
Colormap
gdk_x11_colormap_get_xcolormap (GdkColormap *colormap)
{
  GdkColormapPrivateX11 *private;

  g_return_val_if_fail (GDK_IS_COLORMAP (colormap), None);

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  if (private->screen->closed)
    return None;
  else
    return private->xcolormap;
}

/**
 * gdk_colormap_get_screen:
 * @cmap: a #GdkColormap
 * 
 * Gets the screen for which this colormap was created.
 * 
 * Return value: the screen for which this colormap was created.
 *
 * Since: 2.2
 **/
GdkScreen *
gdk_colormap_get_screen (GdkColormap *cmap)
{
  g_return_val_if_fail (GDK_IS_COLORMAP (cmap), NULL);

  return  GDK_COLORMAP_PRIVATE_DATA (cmap)->screen;
}

#define __GDK_COLOR_X11_C__
#include "gdkaliasdef.c"