mirror of https://github.com/GNOME/gimp.git
284 lines
7.4 KiB
C
284 lines
7.4 KiB
C
/* 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 3 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/* This file contains an interface for pixel objects that their color at
|
|
* a given position can be picked. Also included is a utility for
|
|
* sampling an average area (which uses the implemented picking
|
|
* functions).
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <cairo.h>
|
|
#include <gegl.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;
|
|
}
|
|
|
|
GeglBuffer *
|
|
gimp_pickable_get_buffer (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_buffer)
|
|
return pickable_iface->get_buffer (pickable);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
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] += col[RED];
|
|
color_avg[GREEN] += col[GREEN];
|
|
color_avg[BLUE] += col[BLUE];
|
|
color_avg[ALPHA] += col[ALPHA];
|
|
}
|
|
|
|
col[RED] = (guchar) ((color_avg[RED] + count / 2) / count);
|
|
col[GREEN] = (guchar) ((color_avg[GREEN] + count / 2) / count);
|
|
col[BLUE] = (guchar) ((color_avg[BLUE] + count / 2) / count);
|
|
col[ALPHA] = (guchar) ((color_avg[ALPHA] + count / 2) / count);
|
|
}
|
|
else
|
|
{
|
|
gimp_image_get_color (image, type, pixel, col);
|
|
}
|
|
|
|
|
|
gimp_rgba_set_uchar (color,
|
|
col[RED],
|
|
col[GREEN],
|
|
col[BLUE],
|
|
col[ALPHA]);
|
|
|
|
if (color_index)
|
|
{
|
|
if (GIMP_IMAGE_TYPE_IS_INDEXED (type) && ! sample_average)
|
|
*color_index = pixel[0];
|
|
else
|
|
*color_index = -1;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|