gtk/gdk/gdkcolor.c
2002-10-29 21:27:17 +00:00

371 lines
8.5 KiB
C

/* 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 <time.h>
#include "gdkscreen.h"
#include "gdkcolor.h"
#include "gdkinternals.h"
/**
* gdk_colormap_ref:
* @cmap: a #GdkColormap
*
* Deprecated function; use g_object_ref() instead.
*
* Return value: the colormap
**/
GdkColormap*
gdk_colormap_ref (GdkColormap *cmap)
{
return (GdkColormap *) g_object_ref (cmap);
}
/**
* gdk_colormap_unref:
* @cmap: a #GdkColormap
*
* Deprecated function; use g_object_ref() instead.
**/
void
gdk_colormap_unref (GdkColormap *cmap)
{
g_object_unref (cmap);
}
/**
* gdk_colormap_get_visual:
* @colormap: a #GdkColormap.
*
* Returns the visual for which a given colormap was created.
*
* Return value: the visual of the colormap.
**/
GdkVisual *
gdk_colormap_get_visual (GdkColormap *colormap)
{
g_return_val_if_fail (GDK_IS_COLORMAP (colormap), NULL);
return colormap->visual;
}
/**
* gdk_colors_store:
* @colormap: a #GdkColormap.
* @colors: the new color values.
* @ncolors: the number of colors to change.
*
* Changes the value of the first @ncolors colors in
* a private colormap. This function is obsolete and
* should not be used. See gdk_color_change().
**/
void
gdk_colors_store (GdkColormap *colormap,
GdkColor *colors,
gint ncolors)
{
gint i;
for (i = 0; i < ncolors; i++)
{
colormap->colors[i].pixel = colors[i].pixel;
colormap->colors[i].red = colors[i].red;
colormap->colors[i].green = colors[i].green;
colormap->colors[i].blue = colors[i].blue;
}
gdk_colormap_change (colormap, ncolors);
}
static GMemChunk *color_chunk;
/**
* gdk_color_copy:
* @color: a #GdkColor.
*
* Makes a copy of a color structure. The result
* must be freed using gdk_color_free().
*
* Return value: a copy of @color.
**/
GdkColor*
gdk_color_copy (const GdkColor *color)
{
GdkColor *new_color;
g_return_val_if_fail (color != NULL, NULL);
if (color_chunk == NULL)
color_chunk = g_mem_chunk_new ("colors",
sizeof (GdkColor),
4096,
G_ALLOC_AND_FREE);
new_color = g_chunk_new (GdkColor, color_chunk);
*new_color = *color;
return new_color;
}
/**
* gdk_color_free:
* @color: a #GdkColor.
*
* Frees a color structure created with
* gdk_color_copy().
**/
void
gdk_color_free (GdkColor *color)
{
g_assert (color_chunk != NULL);
g_return_if_fail (color != NULL);
g_mem_chunk_free (color_chunk, color);
}
/**
* gdk_color_white:
* @colormap: a #GdkColormap.
* @color: the location to store the color.
*
* Returns the white color for a given colormap. The resulting
* value has already allocated been allocated.
*
* Return value: %TRUE if the allocation succeeded.
**/
gboolean
gdk_color_white (GdkColormap *colormap,
GdkColor *color)
{
gint return_val;
g_return_val_if_fail (colormap != NULL, FALSE);
if (color)
{
color->red = 65535;
color->green = 65535;
color->blue = 65535;
return_val = gdk_color_alloc (colormap, color);
}
else
return_val = FALSE;
return return_val;
}
/**
* gdk_color_black:
* @colormap: a #GdkColormap.
* @color: the location to store the color.
*
* Returns the black color for a given colormap. The resulting
* value has already benn allocated.
*
* Return value: %TRUE if the allocation succeeded.
**/
gboolean
gdk_color_black (GdkColormap *colormap,
GdkColor *color)
{
gint return_val;
g_return_val_if_fail (colormap != NULL, FALSE);
if (color)
{
color->red = 0;
color->green = 0;
color->blue = 0;
return_val = gdk_color_alloc (colormap, color);
}
else
return_val = FALSE;
return return_val;
}
/********************
* Color allocation *
********************/
/**
* gdk_colormap_alloc_color:
* @colormap: a #GdkColormap.
* @color: the color to allocate. On return the
* <structfield>pixel</structfield> field will be
* filled in if allocation succeeds.
* @writeable: If %TRUE, the color is 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 color cannot be allocated as requested.
*
* Allocates a single color from a colormap.
*
* Return value: %TRUE if the allocation succeeded.
**/
gboolean
gdk_colormap_alloc_color (GdkColormap *colormap,
GdkColor *color,
gboolean writeable,
gboolean best_match)
{
gboolean success;
gdk_colormap_alloc_colors (colormap, color, 1, writeable, best_match,
&success);
return success;
}
/**
* gdk_color_alloc:
* @colormap: a #GdkColormap.
* @color: The color to allocate. On return, the
* <structfield>pixel</structfield> field will be filled in.
*
* Allocates a single color from a colormap.
* This function is obsolete. See gdk_colormap_alloc_color().
*
* Return value: %TRUE if the allocation succeeded.
**/
gboolean
gdk_color_alloc (GdkColormap *colormap,
GdkColor *color)
{
gboolean success;
gdk_colormap_alloc_colors (colormap, color, 1, FALSE, TRUE, &success);
return success;
}
/**
* gdk_color_hash:
* @colora: a #GdkColor.
*
* A hash function suitable for using for a hash
* table that stores #GdkColor's.
*
* Return value: The hash function appled to @colora
**/
guint
gdk_color_hash (const GdkColor *colora)
{
return ((colora->red) +
(colora->green << 11) +
(colora->blue << 22) +
(colora->blue >> 6));
}
/**
* gdk_color_equal:
* @colora: a #GdkColor.
* @colorb: another #GdkColor.
*
* Compares two colors.
*
* Return value: %TRUE if the two colors compare equal
**/
gboolean
gdk_color_equal (const GdkColor *colora,
const GdkColor *colorb)
{
g_return_val_if_fail (colora != NULL, FALSE);
g_return_val_if_fail (colorb != NULL, FALSE);
return ((colora->red == colorb->red) &&
(colora->green == colorb->green) &&
(colora->blue == colorb->blue));
}
GType
gdk_color_get_type (void)
{
static GType our_type = 0;
if (our_type == 0)
our_type = g_boxed_type_register_static ("GdkColor",
(GBoxedCopyFunc)gdk_color_copy,
(GBoxedFreeFunc)gdk_color_free);
return our_type;
}
/**
* gdk_color_parse:
* @spec: the string specifying the color.
* @color: the #GdkColor to fill in
*
* Parses a textual specification of a color and fill in
* the <structfield>red</structfield>,
* <structfield>green</structfield>, and
* <structfield>blue</structfield> fields of a
* #GdkColor structure. The color is <emphasis>not</emphasis>
* allocated, you must call gdk_colormap_alloc_color() yourself.
* The text string can be in any of the forms accepted
* by <function>XParseColor</function>; these include
* name for a color from <filename>rgb.txt</filename>, such as
* <literal>DarkSlateGray</literal>, or a hex specification
* such as <literal>305050</literal>.
*
* Return value: %TRUE if the parsing succeeded.
**/
gboolean
gdk_color_parse (const gchar *spec,
GdkColor *color)
{
PangoColor pango_color;
if (pango_color_parse (&pango_color, spec))
{
color->red = pango_color.red;
color->green = pango_color.green;
color->blue = pango_color.blue;
return TRUE;
}
else
return FALSE;
}
/**
* gdk_colormap_get_system:
*
* Gets the system's default colormap for the default screen. (See
* gdk_colormap_get_system_for_screen ())
*
* Return value: the default colormap.
**/
GdkColormap*
gdk_colormap_get_system (void)
{
return gdk_screen_get_system_colormap (gdk_screen_get_default ());
}