gtk/gdk/gdkgc.c
2001-08-09 07:14:56 +00:00

525 lines
12 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 <string.h>
#include "gdkgc.h"
#include "gdkrgb.h"
#include "gdkprivate.h"
static void gdk_gc_class_init (GObjectClass *class);
static void gdk_gc_finalize (GObject *object);
static GObjectClass *parent_class;
GType
gdk_gc_get_type (void)
{
static GType object_type = 0;
if (!object_type)
{
static const GTypeInfo object_info =
{
sizeof (GdkGCClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gdk_gc_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GdkGC),
0, /* n_preallocs */
(GInstanceInitFunc) NULL,
};
object_type = g_type_register_static (G_TYPE_OBJECT,
"GdkGC",
&object_info, 0);
}
return object_type;
}
static void
gdk_gc_class_init (GObjectClass *class)
{
parent_class = g_type_class_peek_parent (class);
class->finalize = gdk_gc_finalize;
}
GdkGC*
gdk_gc_new (GdkDrawable *drawable)
{
g_return_val_if_fail (drawable != NULL, NULL);
return gdk_gc_new_with_values (drawable, NULL, 0);
}
GdkGC*
gdk_gc_new_with_values (GdkDrawable *drawable,
GdkGCValues *values,
GdkGCValuesMask values_mask)
{
GdkGC *gc;
g_return_val_if_fail (drawable != NULL, NULL);
gc = GDK_DRAWABLE_GET_CLASS (drawable)->create_gc (drawable,
values,
values_mask);
if (gc == NULL) /* This would mean the drawable was destroyed. */
return NULL;
if (values_mask & GDK_GC_CLIP_X_ORIGIN)
gc->clip_x_origin = values->clip_x_origin;
if (values_mask & GDK_GC_CLIP_Y_ORIGIN)
gc->clip_y_origin = values->clip_y_origin;
if (values_mask & GDK_GC_TS_X_ORIGIN)
gc->ts_x_origin = values->ts_x_origin;
if (values_mask & GDK_GC_TS_Y_ORIGIN)
gc->ts_y_origin = values->ts_y_origin;
gc->colormap = gdk_drawable_get_colormap (drawable);
if (gc->colormap)
g_object_ref (G_OBJECT (gc->colormap));
return gc;
}
static void
gdk_gc_finalize (GObject *object)
{
GdkGC *gc = GDK_GC (object);
if (gc->colormap)
g_object_unref (G_OBJECT (gc->colormap));
parent_class->finalize (object);
}
GdkGC *
gdk_gc_ref (GdkGC *gc)
{
return (GdkGC *) g_object_ref (G_OBJECT (gc));
}
void
gdk_gc_unref (GdkGC *gc)
{
g_object_unref (G_OBJECT (gc));
}
void
gdk_gc_get_values (GdkGC *gc,
GdkGCValues *values)
{
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (values != NULL);
GDK_GC_GET_CLASS (gc)->get_values (gc, values);
}
/**
* gdk_gc_set_values:
* @gc: a #GdkGC
* @values: struct containing the new values
* @values_mask: mask indicating which struct fields are to be used
*
* Sets attributes of a graphics context in bulk. For each flag set in
* @values_mask, the corresponding field will be read from @values and
* set as the new value for @gc. If you're only setting a few values
* on @gc, calling individual "setter" functions is likely more
* convenient.
*
**/
void
gdk_gc_set_values (GdkGC *gc,
GdkGCValues *values,
GdkGCValuesMask values_mask)
{
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (values != NULL);
if (values_mask & GDK_GC_CLIP_X_ORIGIN)
gc->clip_x_origin = values->clip_x_origin;
if (values_mask & GDK_GC_CLIP_Y_ORIGIN)
gc->clip_y_origin = values->clip_y_origin;
if (values_mask & GDK_GC_TS_X_ORIGIN)
gc->ts_x_origin = values->ts_x_origin;
if (values_mask & GDK_GC_TS_Y_ORIGIN)
gc->ts_y_origin = values->ts_y_origin;
GDK_GC_GET_CLASS (gc)->set_values (gc, values, values_mask);
}
void
gdk_gc_set_foreground (GdkGC *gc,
GdkColor *color)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (color != NULL);
values.foreground = *color;
gdk_gc_set_values (gc, &values, GDK_GC_FOREGROUND);
}
void
gdk_gc_set_background (GdkGC *gc,
GdkColor *color)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (color != NULL);
values.background = *color;
gdk_gc_set_values (gc, &values, GDK_GC_BACKGROUND);
}
void
gdk_gc_set_font (GdkGC *gc,
GdkFont *font)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (font != NULL);
values.font = font;
gdk_gc_set_values (gc, &values, GDK_GC_FONT);
}
void
gdk_gc_set_function (GdkGC *gc,
GdkFunction function)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.function = function;
gdk_gc_set_values (gc, &values, GDK_GC_FUNCTION);
}
void
gdk_gc_set_fill (GdkGC *gc,
GdkFill fill)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.fill = fill;
gdk_gc_set_values (gc, &values, GDK_GC_FILL);
}
void
gdk_gc_set_tile (GdkGC *gc,
GdkPixmap *tile)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.tile = tile;
gdk_gc_set_values (gc, &values, GDK_GC_TILE);
}
void
gdk_gc_set_stipple (GdkGC *gc,
GdkPixmap *stipple)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.stipple = stipple;
gdk_gc_set_values (gc, &values, GDK_GC_STIPPLE);
}
void
gdk_gc_set_ts_origin (GdkGC *gc,
gint x,
gint y)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.ts_x_origin = x;
values.ts_y_origin = y;
gdk_gc_set_values (gc, &values,
GDK_GC_TS_X_ORIGIN | GDK_GC_TS_Y_ORIGIN);
}
void
gdk_gc_set_clip_origin (GdkGC *gc,
gint x,
gint y)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.clip_x_origin = x;
values.clip_y_origin = y;
gdk_gc_set_values (gc, &values,
GDK_GC_CLIP_X_ORIGIN | GDK_GC_CLIP_Y_ORIGIN);
}
void
gdk_gc_set_clip_mask (GdkGC *gc,
GdkBitmap *mask)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.clip_mask = mask;
gdk_gc_set_values (gc, &values, GDK_GC_CLIP_MASK);
}
void
gdk_gc_set_subwindow (GdkGC *gc,
GdkSubwindowMode mode)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.subwindow_mode = mode;
gdk_gc_set_values (gc, &values, GDK_GC_SUBWINDOW);
}
void
gdk_gc_set_exposures (GdkGC *gc,
gboolean exposures)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.graphics_exposures = exposures;
gdk_gc_set_values (gc, &values, GDK_GC_EXPOSURES);
}
void
gdk_gc_set_line_attributes (GdkGC *gc,
gint line_width,
GdkLineStyle line_style,
GdkCapStyle cap_style,
GdkJoinStyle join_style)
{
GdkGCValues values;
values.line_width = line_width;
values.line_style = line_style;
values.cap_style = cap_style;
values.join_style = join_style;
gdk_gc_set_values (gc, &values,
GDK_GC_LINE_WIDTH |
GDK_GC_LINE_STYLE |
GDK_GC_CAP_STYLE |
GDK_GC_JOIN_STYLE);
}
void
gdk_gc_set_dashes (GdkGC *gc,
gint dash_offset,
gint8 dash_list[],
gint n)
{
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (dash_list != NULL);
GDK_GC_GET_CLASS (gc)->set_dashes (gc, dash_offset, dash_list, n);
}
/**
* gdk_gc_offset:
* @gc: a #GdkGC
* @x_offset: amount by which to offset the GC in the X direction
* @y_offset: amount by which to offset the GC in the Y direction
*
* Offset attributes such as the clip and tile-stipple origins
* of the GC so that drawing at x - x_offset, y - y_offset with
* the offset GC has the same effect as drawing at x, y with the original
* GC.
**/
void
gdk_gc_offset (GdkGC *gc,
gint x_offset,
gint y_offset)
{
if (x_offset != 0 || y_offset != 0)
{
GdkGCValues values;
values.clip_x_origin = gc->clip_x_origin - x_offset;
values.clip_y_origin = gc->clip_y_origin - y_offset;
values.ts_x_origin = gc->ts_x_origin - x_offset;
values.ts_y_origin = gc->ts_y_origin - y_offset;
gdk_gc_set_values (gc, &values,
GDK_GC_CLIP_X_ORIGIN |
GDK_GC_CLIP_Y_ORIGIN |
GDK_GC_TS_X_ORIGIN |
GDK_GC_TS_Y_ORIGIN);
}
}
/**
* gdk_gc_set_colormap:
* @gc: a #GdkGC
* @colormap: a #GdkColormap
*
* Sets the colormap for the GC to the given colormap. The depth
* of the colormap's visual must match the depth of the drawable
* for which the GC was created.
**/
void
gdk_gc_set_colormap (GdkGC *gc,
GdkColormap *colormap)
{
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (GDK_IS_COLORMAP (colormap));
if (gc->colormap != colormap)
{
if (gc->colormap)
g_object_unref (G_OBJECT (gc->colormap));
gc->colormap = colormap;
g_object_ref (G_OBJECT (gc->colormap));
}
}
/**
* gdk_gc_get_colormap:
* @gc: a #GdkGC
*
* Retrieves the colormap for a given GC, if it exists.
* A GC will have a colormap if the drawable for which it was created
* has a colormap, or if a colormap was set explicitely with
* gdk_gc_set_colormap.
*
* Return value:
**/
GdkColormap *
gdk_gc_get_colormap (GdkGC *gc)
{
g_return_val_if_fail (GDK_IS_GC (gc), NULL);
return gc->colormap;
}
static GdkColormap *
gdk_gc_get_colormap_warn (GdkGC *gc)
{
GdkColormap *colormap = gdk_gc_get_colormap (gc);
if (!colormap)
{
g_warning ("gdk_gc_set_rgb_fg_color() and gdk_gc_set_rgb_bg_color() can\n"
"only be used on GC's with a colormap. A GC will have a colormap\n"
"if it is created for a drawable with a colormap, or if a\n"
"colormap has been set explicitly with gdk_gc_set_colormap.\n");
return NULL;
}
return colormap;
}
/**
* gdk_gc_set_rgb_fg_color:
* @gc: a #GdkGC
* @color: an unallocated #GdkColor.
*
* Set the foreground color of a GC using an unallocated color. The
* pixel value for the color will be determined using GdkRGB. If the
* colormap for the GC has not previously been initialized for GdkRGB,
* then for pseudo-color colormaps (colormaps with a small modifiable
* number of colors), a colorcube will be allocated in the colormap.
*
* Calling this function for a GC without a colormap is an error.
**/
void
gdk_gc_set_rgb_fg_color (GdkGC *gc, GdkColor *color)
{
GdkColormap *cmap;
GdkColor tmp_color;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (color != NULL);
cmap = gdk_gc_get_colormap_warn (gc);
if (!cmap)
return;
tmp_color = *color;
gdk_rgb_find_color (cmap, &tmp_color);
gdk_gc_set_foreground (gc, &tmp_color);
}
/**
* gdk_gc_set_rgb_bg_color:
* @gc: a #GdkGC
* @color: an unallocated #GdkColor.
*
* Set the background color of a GC using an unallocated color. The
* pixel value for the color will be determined using GdkRGB. If the
* colormap for the GC has not previously been initialized for GdkRGB,
* then for pseudo-color colormaps (colormaps with a small modifiable
* number of colors), a colorcube will be allocated in the colormap.
*
* Calling this function for a GC without a colormap is an error.
**/
void
gdk_gc_set_rgb_bg_color (GdkGC *gc, GdkColor *color)
{
GdkColormap *cmap;
GdkColor tmp_color;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (color != NULL);
cmap = gdk_gc_get_colormap_warn (gc);
if (!cmap)
return;
tmp_color = *color;
gdk_rgb_find_color (cmap, &tmp_color);
gdk_gc_set_background (gc, &tmp_color);
}