gdkcolor-x11.c

linux下电话本所依赖的一些图形库

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include <config.h>
#include <time.h>

#include "gdkcolor.h"
#include "gdkinternals.h"
#include "gdkx.h"
#include "gdkprivate-x11.h"
#include "gdkscreen-x11.h"
#include "gdkalias.h"

typedef struct _GdkColormapPrivateX11  GdkColormapPrivateX11;

struct _GdkColormapPrivateX11
{
  GdkScreen *screen;
  Colormap xcolormap;
  gint private_val;

  GHashTable *hash;
  GdkColorInfo *info;
  time_t last_sync_time;

  guint foreign : 1;
};

#define GDK_COLORMAP_PRIVATE_DATA(cmap) ((GdkColormapPrivateX11 *) GDK_COLORMAP (cmap)->windowing_data)

static gint     gdk_colormap_match_color (GdkColormap *cmap,
					  GdkColor    *color,
					  const gchar *available);
static void     gdk_colormap_add         (GdkColormap *cmap);
static void     gdk_colormap_remove      (GdkColormap *cmap);

static GdkColormap *gdk_colormap_lookup   (GdkScreen   *screen,
					   Colormap     xcolormap);

static guint    gdk_colormap_hash        (Colormap    *cmap);
static gboolean gdk_colormap_equal       (Colormap    *a,
					  Colormap    *b);
static void     gdk_colormap_sync        (GdkColormap *colormap,
                                          gboolean     force);

static void gdk_colormap_init       (GdkColormap      *colormap);
static void gdk_colormap_class_init (GdkColormapClass *klass);
static void gdk_colormap_finalize   (GObject              *object);

static gpointer parent_class = NULL;

GType
gdk_colormap_get_type (void)
{
  static GType object_type = 0;

  if (!object_type)
    {
      static const GTypeInfo object_info =
      {
        sizeof (GdkColormapClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) gdk_colormap_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data */
        sizeof (GdkColormap),
        0,              /* n_preallocs */
        (GInstanceInitFunc) gdk_colormap_init,
      };
      
      object_type = g_type_register_static (G_TYPE_OBJECT,
                                            "GdkColormap",
                                            &object_info, 0);
    }
  
  return object_type;
}

static void
gdk_colormap_init (GdkColormap *colormap)
{
  GdkColormapPrivateX11 *private;

  private = g_new (GdkColormapPrivateX11, 1);

  colormap->windowing_data = private;
  
  private->screen = NULL;
  private->hash = NULL;
  private->last_sync_time = 0;
  private->info = NULL;

  colormap->size = 0;
  colormap->colors = NULL;
}

static void
gdk_colormap_class_init (GdkColormapClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);

  object_class->finalize = gdk_colormap_finalize;
}

static void
gdk_colormap_finalize (GObject *object)
{
  GdkColormap *colormap = GDK_COLORMAP (object);
  GdkColormapPrivateX11 *private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  gdk_colormap_remove (colormap);

  if (!private->screen->closed)
    XFreeColormap (GDK_SCREEN_XDISPLAY (private->screen), private->xcolormap);

  if (private->hash)
    g_hash_table_destroy (private->hash);
  
  g_free (private->info);
  g_free (colormap->colors);
  g_free (private);
  
  G_OBJECT_CLASS (parent_class)->finalize (object);
}

/**
 * gdk_colormap_new:
 * @visual: a #GdkVisual.
 * @allocate: if %TRUE, the newly created colormap will be
 * a private colormap, and all colors in it will be
 * allocated for the applications use.
 * 
 * Creates a new colormap for the given visual.
 * 
 * Return value: the new #GdkColormap.
 **/
GdkColormap*
gdk_colormap_new (GdkVisual *visual,
		  gboolean   allocate)
{
  GdkColormap *colormap;
  GdkColormapPrivateX11 *private;
  Visual *xvisual;
  Display *xdisplay;
  Window xrootwin;
  int size;
  int i;

  /* FIXME when object properties settle down, there needs to be some
   * kind of default construction (and construct-only arguments)
   */
  
  g_return_val_if_fail (GDK_IS_VISUAL (visual), NULL);

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

  colormap->visual = visual;
  private->screen = gdk_visual_get_screen (visual);
  
  xvisual = ((GdkVisualPrivate*) visual)->xvisual;
  xdisplay = GDK_SCREEN_XDISPLAY (private->screen);
  xrootwin = GDK_SCREEN_XROOTWIN (private->screen);

  colormap->size = visual->colormap_size;

  switch (visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_PSEUDO_COLOR:
      private->info = g_new0 (GdkColorInfo, colormap->size);
      colormap->colors = g_new (GdkColor, colormap->size);
      
      private->hash = g_hash_table_new ((GHashFunc) gdk_color_hash,
					(GEqualFunc) gdk_color_equal);
      
      private->private_val = allocate;
      private->xcolormap = XCreateColormap (xdisplay, xrootwin,
					    xvisual, (allocate) ? (AllocAll) : (AllocNone));

      if (allocate)
	{
          GdkVisual *system_visual;
	  XColor *default_colors;
          gint n_default_colors;

          system_visual = gdk_screen_get_system_visual (private->screen);
	  n_default_colors = MIN (system_visual->colormap_size, colormap->size);

 	  default_colors = g_new (XColor, colormap->size);

	  for (i = 0; i < n_default_colors; i++)
	    default_colors[i].pixel = i;
	  
	  XQueryColors (xdisplay,
			DefaultColormapOfScreen (GDK_SCREEN_X11 (private->screen)->xscreen),
			default_colors, n_default_colors);

	  for (i = 0; i < n_default_colors; i++)
	    {
	      colormap->colors[i].pixel = default_colors[i].pixel;
	      colormap->colors[i].red = default_colors[i].red;
	      colormap->colors[i].green = default_colors[i].green;
	      colormap->colors[i].blue = default_colors[i].blue;
	    }

	  gdk_colormap_change (colormap, n_default_colors);
	  
	  g_free (default_colors);
	}
      break;

    case GDK_VISUAL_DIRECT_COLOR:
      private->private_val = TRUE;
      private->xcolormap = XCreateColormap (xdisplay, xrootwin,
					    xvisual, AllocAll);
      colormap->colors = g_new (GdkColor, colormap->size);

      size = 1 << visual->red_prec;
      for (i = 0; i < size; i++)
	colormap->colors[i].red = i * 65535 / (size - 1);

      size = 1 << visual->green_prec;
      for (i = 0; i < size; i++)
	colormap->colors[i].green = i * 65535 / (size - 1);

      size = 1 << visual->blue_prec;
      for (i = 0; i < size; i++)
	colormap->colors[i].blue = i * 65535 / (size - 1);

      gdk_colormap_change (colormap, colormap->size);
      break;

    case GDK_VISUAL_STATIC_GRAY:
    case GDK_VISUAL_STATIC_COLOR:
      private->private_val = FALSE;
      private->xcolormap = XCreateColormap (xdisplay, xrootwin,
					    xvisual, AllocNone);
      
      colormap->colors = g_new (GdkColor, colormap->size);
      gdk_colormap_sync (colormap, TRUE);
      break;
      
    case GDK_VISUAL_TRUE_COLOR:
      private->private_val = FALSE;
      private->xcolormap = XCreateColormap (xdisplay, xrootwin,
					    xvisual, AllocNone);
      break;
    }

  gdk_colormap_add (colormap);

  return colormap;
}

static void
gdk_colormap_sync_palette (GdkColormap *colormap)
{
  GdkColormapPrivateX11 *private = GDK_COLORMAP_PRIVATE_DATA (colormap);
  XColor *xpalette;
  gint nlookup;
  gint i;

  nlookup = 0;
  xpalette = g_new (XColor, colormap->size);
  
  for (i = 0; i < colormap->size; i++)
    {
      if (!private->info || private->info[i].ref_count == 0)
	{
	  xpalette[nlookup].pixel = i;
	  xpalette[nlookup].red = 0;
	  xpalette[nlookup].green = 0;
	  xpalette[nlookup].blue = 0;
	  nlookup++;
	}
    }

  XQueryColors (GDK_SCREEN_XDISPLAY (private->screen),
		private->xcolormap, xpalette, nlookup);
  
  for (i = 0; i < nlookup; i++)
    {
      gulong pixel = xpalette[i].pixel;
      colormap->colors[pixel].pixel = pixel;
      colormap->colors[pixel].red = xpalette[i].red;
      colormap->colors[pixel].green = xpalette[i].green;
      colormap->colors[pixel].blue = xpalette[i].blue;
    }
  
  g_free (xpalette);
}

static void
gdk_colormap_sync_direct_color (GdkColormap *colormap)
{
  GdkColormapPrivateX11 *private = GDK_COLORMAP_PRIVATE_DATA (colormap);
  GdkVisual *visual = colormap->visual;
  XColor *xpalette;
  gint i;

  xpalette = g_new (XColor, colormap->size);
  
  for (i = 0; i < colormap->size; i++)
    {
      xpalette[i].pixel =
	(((i << visual->red_shift)   & visual->red_mask)   |
	 ((i << visual->green_shift) & visual->green_mask) |
	 ((i << visual->blue_shift)  & visual->blue_mask));
    }

  XQueryColors (GDK_SCREEN_XDISPLAY (private->screen),
		private->xcolormap, xpalette, colormap->size);
  
  for (i = 0; i < colormap->size; i++)
    {
      colormap->colors[i].pixel = xpalette[i].pixel;
      colormap->colors[i].red = xpalette[i].red;
      colormap->colors[i].green = xpalette[i].green;
      colormap->colors[i].blue = xpalette[i].blue;
    }
  
  g_free (xpalette);
}

#define MIN_SYNC_TIME 2

static void
gdk_colormap_sync (GdkColormap *colormap,
		   gboolean     force)
{
  time_t current_time;
  GdkColormapPrivateX11 *private = GDK_COLORMAP_PRIVATE_DATA (colormap);

  g_return_if_fail (GDK_IS_COLORMAP (colormap));

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

  current_time = time (NULL);
  if (!force && ((current_time - private->last_sync_time) < MIN_SYNC_TIME))
    return;

  private->last_sync_time = current_time;

  if (colormap->visual->type == GDK_VISUAL_DIRECT_COLOR)
    gdk_colormap_sync_direct_color (colormap);
  else
    gdk_colormap_sync_palette (colormap);
}
		   
/**
 * gdk_screen_get_system_colormap:
 * @screen: a #GdkScreen
 *
 * Gets the system's default colormap for @screen
 *
 * Returns: the default colormap for @screen.
 *
 * Since: 2.2
 */
GdkColormap *
gdk_screen_get_system_colormap (GdkScreen *screen)
{
  GdkColormap *colormap = NULL;
  GdkColormapPrivateX11 *private;
  GdkScreenX11 *screen_x11;

  g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
  screen_x11 = GDK_SCREEN_X11 (screen);

  if (screen_x11->system_colormap)
    return screen_x11->system_colormap;

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

  private->screen = screen;
  colormap->visual = gdk_screen_get_system_visual (screen);
  
  private->xcolormap = DefaultColormapOfScreen (screen_x11->xscreen);
  private->private_val = FALSE;

  private->hash = NULL;
  private->last_sync_time = 0;
  private->info = NULL;

  colormap->colors = NULL;
  colormap->size = colormap->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);
  screen_x11->system_colormap = colormap;
  
  return colormap;
}

/**
 * gdk_colormap_get_system_size:
 * 
 * Returns the size of the system's default colormap.
 * (See the description of struct #GdkColormap for an
 * explanation of the size of a colormap.)
 * 
 * Return value: the size of the system's default colormap.
 **/
gint
gdk_colormap_get_system_size (void)
{
  return DisplayCells (GDK_SCREEN_XDISPLAY (gdk_screen_get_default()),
		       GDK_SCREEN_X11 (gdk_screen_get_default())->screen_num);
}

/**
 * gdk_colormap_change:
 * @colormap: a #GdkColormap.
 * @ncolors: the number of colors to change.
 * 
 * Changes the value of the first @ncolors in a private colormap
 * to match the values in the <structfield>colors</structfield>
 * array in the colormap. This function is obsolete and
 * should not be used. See gdk_color_change().
 **/
void
gdk_colormap_change (GdkColormap *colormap,
		     gint         ncolors)
{
  GdkColormapPrivateX11 *private;
  GdkVisual *visual;
  XColor *palette;
  Display *xdisplay;
  gint shift;
  int max_colors;
  int size;
  int i;

  g_return_if_fail (GDK_IS_COLORMAP (colormap));

  private = GDK_COLORMAP_PRIVATE_DATA (colormap);

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

  xdisplay = GDK_SCREEN_XDISPLAY (private->screen);
  palette = g_new (XColor, ncolors);

  switch (colormap->visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_PSEUDO_COLOR:
      for (i = 0; i < ncolors; i++)
	{
	  palette[i].pixel = colormap->colors[i].pixel;
	  palette[i].red = colormap->colors[i].red;
	  palette[i].green = colormap->colors[i].green;
	  palette[i].blue = colormap->colors[i].blue;
	  palette[i].flags = DoRed | DoGreen | DoBlue;
	}

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

    case GDK_VISUAL_DIRECT_COLOR:
      visual = colormap->visual;

      shift = visual->red_shift;
      max_colors = 1 << visual->red_prec;
      size = (ncolors < max_colors) ? (ncolors) : (max_colors);