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gimp/app/core/gimppickable.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimppickable.c
* Copyright (C) 2004 Michael Natterer <mitch@gimp.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <glib-object.h>
#include "libgimpcolor/gimpcolor.h"
#include "core-types.h"
#include "gimpobject.h"
#include "gimpimage.h"
#include "gimppickable.h"
GType
gimp_pickable_interface_get_type (void)
{
static GType pickable_iface_type = 0;
if (! pickable_iface_type)
{
const GTypeInfo pickable_iface_info =
{
sizeof (GimpPickableInterface),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
};
pickable_iface_type = g_type_register_static (G_TYPE_INTERFACE,
"GimpPickableInterface",
&pickable_iface_info,
0);
g_type_interface_add_prerequisite (pickable_iface_type, GIMP_TYPE_OBJECT);
}
return pickable_iface_type;
}
void
gimp_pickable_flush (GimpPickable *pickable)
{
GimpPickableInterface *pickable_iface;
g_return_if_fail (GIMP_IS_PICKABLE (pickable));
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->flush)
pickable_iface->flush (pickable);
}
GimpImage *
gimp_pickable_get_image (GimpPickable *pickable)
{
GimpPickableInterface *pickable_iface;
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), NULL);
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->get_image)
return pickable_iface->get_image (pickable);
return NULL;
}
GimpImageType
gimp_pickable_get_image_type (GimpPickable *pickable)
{
GimpPickableInterface *pickable_iface;
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), -1);
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->get_image_type)
return pickable_iface->get_image_type (pickable);
return -1;
}
gint
gimp_pickable_get_bytes (GimpPickable *pickable)
{
GimpPickableInterface *pickable_iface;
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), 0);
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->get_bytes)
return pickable_iface->get_bytes (pickable);
return 0;
}
TileManager *
gimp_pickable_get_tiles (GimpPickable *pickable)
{
GimpPickableInterface *pickable_iface;
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), NULL);
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->get_tiles)
return pickable_iface->get_tiles (pickable);
return NULL;
}
gboolean
gimp_pickable_get_pixel_at (GimpPickable *pickable,
gint x,
gint y,
guchar *pixel)
{
GimpPickableInterface *pickable_iface;
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), FALSE);
g_return_val_if_fail (pixel != NULL, FALSE);
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->get_pixel_at)
return pickable_iface->get_pixel_at (pickable, x, y, pixel);
return FALSE;
}
gboolean
gimp_pickable_get_color_at (GimpPickable *pickable,
gint x,
gint y,
GimpRGB *color)
{
guchar pixel[4];
guchar col[4];
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), FALSE);
g_return_val_if_fail (color != NULL, FALSE);
if (! gimp_pickable_get_pixel_at (pickable, x, y, pixel))
return FALSE;
gimp_image_get_color (gimp_pickable_get_image (pickable),
gimp_pickable_get_image_type (pickable),
pixel, col);
gimp_rgba_set_uchar (color, col[0], col[1], col[2], col[3]);
return TRUE;
}
gint
gimp_pickable_get_opacity_at (GimpPickable *pickable,
gint x,
gint y)
{
GimpPickableInterface *pickable_iface;
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), 0);
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->get_opacity_at)
return pickable_iface->get_opacity_at (pickable, x, y);
return 0;
}
gboolean
gimp_pickable_pick_color (GimpPickable *pickable,
gint x,
gint y,
gboolean sample_average,
gdouble average_radius,
GimpRGB *color,
gint *color_index)
{
GimpImage *image;
GimpImageType type;
guchar pixel[4];
guchar col[4];
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), FALSE);
if (! gimp_pickable_get_pixel_at (pickable, x, y, pixel))
return FALSE;
image = gimp_pickable_get_image (pickable);
type = gimp_pickable_get_image_type (pickable);
if (sample_average)
{
gint count = 0;
gint color_avg[4] = { 0, 0, 0, 0 };
gint radius = (gint) average_radius;
gint i, j;
for (i = x - radius; i <= x + radius; i++)
for (j = y - radius; j <= y + radius; j++)
if (gimp_pickable_get_pixel_at (pickable, i, j, pixel))
{
count++;
gimp_image_get_color (image, type, pixel, col);
color_avg[RED_PIX] += col[RED_PIX];
color_avg[GREEN_PIX] += col[GREEN_PIX];
color_avg[BLUE_PIX] += col[BLUE_PIX];
color_avg[ALPHA_PIX] += col[ALPHA_PIX];
}
col[RED_PIX] = (guchar) ((color_avg[RED_PIX] + count / 2) / count);
col[GREEN_PIX] = (guchar) ((color_avg[GREEN_PIX] + count / 2) / count);
col[BLUE_PIX] = (guchar) ((color_avg[BLUE_PIX] + count / 2) / count);
col[ALPHA_PIX] = (guchar) ((color_avg[ALPHA_PIX] + count / 2) / count);
}
else
{
gimp_image_get_color (image, type, pixel, col);
}
gimp_rgba_set_uchar (color,
col[RED_PIX],
col[GREEN_PIX],
col[BLUE_PIX],
col[ALPHA_PIX]);
if (color_index)
{
if (GIMP_IMAGE_TYPE_IS_INDEXED (type) && ! sample_average)
*color_index = pixel[0];
else
*color_index = -1;
}
return TRUE;
}
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