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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 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 <string.h>
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libgimpcolor/gimpcolor.h"
#include "core-types.h"
#include "gimpobject.h"
#include "gimpimage.h"
#include "gimppickable.h"
static void gimp_pickable_interface_base_init (GimpPickableInterface *iface);
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) gimp_pickable_interface_base_init,
(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;
}
static void
gimp_pickable_interface_base_init (GimpPickableInterface *iface)
{
static gboolean initialized = FALSE;
if (! initialized)
{
g_object_interface_install_property (iface,
g_param_spec_object ("buffer",
NULL, NULL,
GEGL_TYPE_BUFFER,
GIMP_PARAM_READABLE));
initialized = TRUE;
}
}
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;
}
const Babl *
gimp_pickable_get_format (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_format)
return pickable_iface->get_format (pickable);
return NULL;
}
const Babl *
gimp_pickable_get_format_with_alpha (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_format_with_alpha)
return pickable_iface->get_format_with_alpha (pickable);
return NULL;
}
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;
}
gboolean
gimp_pickable_get_pixel_at (GimpPickable *pickable,
gint x,
gint y,
const Babl *format,
gpointer pixel)
{
GimpPickableInterface *pickable_iface;
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), FALSE);
g_return_val_if_fail (pixel != NULL, FALSE);
if (! format)
format = gimp_pickable_get_format (pickable);
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->get_pixel_at)
return pickable_iface->get_pixel_at (pickable, x, y, format, pixel);
return FALSE;
}
gboolean
gimp_pickable_get_color_at (GimpPickable *pickable,
gint x,
gint y,
GimpRGB *color)
{
guchar pixel[32];
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, NULL, pixel))
return FALSE;
gimp_pickable_pixel_to_srgb (pickable, NULL, pixel, color);
return TRUE;
}
gdouble
gimp_pickable_get_opacity_at (GimpPickable *pickable,
gint x,
gint y)
{
GimpPickableInterface *pickable_iface;
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), GIMP_OPACITY_TRANSPARENT);
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->get_opacity_at)
return pickable_iface->get_opacity_at (pickable, x, y);
return GIMP_OPACITY_TRANSPARENT;
}
void
gimp_pickable_pixel_to_srgb (GimpPickable *pickable,
const Babl *format,
gpointer pixel,
GimpRGB *color)
{
GimpPickableInterface *pickable_iface;
g_return_if_fail (GIMP_IS_PICKABLE (pickable));
g_return_if_fail (pixel != NULL);
g_return_if_fail (color != NULL);
if (! format)
format = gimp_pickable_get_format (pickable);
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->pixel_to_srgb)
{
pickable_iface->pixel_to_srgb (pickable, format, pixel, color);
}
else
{
gimp_rgba_set_pixel (color, format, pixel);
}
}
void
gimp_pickable_srgb_to_pixel (GimpPickable *pickable,
const GimpRGB *color,
const Babl *format,
gpointer pixel)
{
GimpPickableInterface *pickable_iface;
g_return_if_fail (GIMP_IS_PICKABLE (pickable));
g_return_if_fail (color != NULL);
g_return_if_fail (pixel != NULL);
if (! format)
format = gimp_pickable_get_format (pickable);
pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
if (pickable_iface->srgb_to_pixel)
{
pickable_iface->srgb_to_pixel (pickable, color, format, pixel);
}
else
{
gimp_rgba_get_pixel (color, format, pixel);
}
}
void
gimp_pickable_srgb_to_image_color (GimpPickable *pickable,
const GimpRGB *color,
GimpRGB *image_color)
{
g_return_if_fail (GIMP_IS_PICKABLE (pickable));
g_return_if_fail (color != NULL);
g_return_if_fail (image_color != NULL);
gimp_pickable_srgb_to_pixel (pickable,
color,
babl_format ("R'G'B'A double"),
image_color);
}
gboolean
gimp_pickable_pick_color (GimpPickable *pickable,
gint x,
gint y,
gboolean sample_average,
gdouble average_radius,
gpointer pixel,
GimpRGB *color)
{
const Babl *format;
gdouble sample[4];
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), FALSE);
format = gimp_pickable_get_format (pickable);
if (! gimp_pickable_get_pixel_at (pickable, x, y, format, sample))
return FALSE;
gimp_pickable_pixel_to_srgb (pickable, format, sample, color);
if (pixel)
memcpy (pixel, sample, babl_format_get_bytes_per_pixel (format));
if (sample_average)
{
gint count = 0;
gdouble color_avg[4] = { 0.0, 0.0, 0.0, 0.0 };
gint radius = (gint) average_radius;
gint i, j;
format = babl_format ("RaGaBaA double");
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, format, sample))
{
count++;
color_avg[RED] += sample[RED];
color_avg[GREEN] += sample[GREEN];
color_avg[BLUE] += sample[BLUE];
color_avg[ALPHA] += sample[ALPHA];
}
sample[RED] = color_avg[RED] / count;
sample[GREEN] = color_avg[GREEN] / count;
sample[BLUE] = color_avg[BLUE] / count;
sample[ALPHA] = color_avg[ALPHA] / count;
gimp_pickable_pixel_to_srgb (pickable, format, sample, color);
}
return TRUE;
}
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