mirror of https://github.com/GNOME/gimp.git
384 lines
10 KiB
C
384 lines
10 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 <https://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 "libgimpbase/gimpbase.h"
|
|
#include "libgimpcolor/gimpcolor.h"
|
|
#include "libgimpmath/gimpmath.h"
|
|
|
|
#include "core-types.h"
|
|
|
|
#include "gimpobject.h"
|
|
#include "gimpimage.h"
|
|
#include "gimppickable.h"
|
|
|
|
|
|
/* local function prototypes */
|
|
|
|
static void gimp_pickable_real_get_pixel_average (GimpPickable *pickable,
|
|
const GeglRectangle *rect,
|
|
const Babl *format,
|
|
gpointer pixel);
|
|
|
|
|
|
G_DEFINE_INTERFACE (GimpPickable, gimp_pickable, GIMP_TYPE_OBJECT)
|
|
|
|
|
|
/* private functions */
|
|
|
|
|
|
static void
|
|
gimp_pickable_default_init (GimpPickableInterface *iface)
|
|
{
|
|
iface->get_pixel_average = gimp_pickable_real_get_pixel_average;
|
|
|
|
g_object_interface_install_property (iface,
|
|
g_param_spec_object ("buffer",
|
|
NULL, NULL,
|
|
GEGL_TYPE_BUFFER,
|
|
GIMP_PARAM_READABLE));
|
|
}
|
|
|
|
static void
|
|
gimp_pickable_real_get_pixel_average (GimpPickable *pickable,
|
|
const GeglRectangle *rect,
|
|
const Babl *format,
|
|
gpointer pixel)
|
|
{
|
|
const Babl *average_format;
|
|
gdouble average[4] = { 0, };
|
|
gint n = 0;
|
|
gint x;
|
|
gint y;
|
|
gint c;
|
|
|
|
average_format = babl_format_with_space ("RaGaBaA double",
|
|
babl_format_get_space (format));
|
|
|
|
for (y = rect->y; y < rect->y + rect->height; y++)
|
|
{
|
|
for (x = rect->x; x < rect->x + rect->width; x++)
|
|
{
|
|
gdouble sample[4];
|
|
|
|
if (gimp_pickable_get_pixel_at (pickable,
|
|
x, y, average_format, sample))
|
|
{
|
|
for (c = 0; c < 4; c++)
|
|
average[c] += sample[c];
|
|
|
|
n++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (n > 0)
|
|
{
|
|
for (c = 0; c < 4; c++)
|
|
average[c] /= n;
|
|
}
|
|
|
|
babl_process (babl_fish (average_format, format), average, pixel, 1);
|
|
}
|
|
|
|
|
|
/* public functions */
|
|
|
|
|
|
void
|
|
gimp_pickable_flush (GimpPickable *pickable)
|
|
{
|
|
GimpPickableInterface *pickable_iface;
|
|
|
|
g_return_if_fail (GIMP_IS_PICKABLE (pickable));
|
|
|
|
pickable_iface = GIMP_PICKABLE_GET_IFACE (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_IFACE (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_IFACE (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_IFACE (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_IFACE (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_IFACE (pickable);
|
|
|
|
if (pickable_iface->get_pixel_at)
|
|
return pickable_iface->get_pixel_at (pickable, x, y, format, pixel);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
void
|
|
gimp_pickable_get_pixel_average (GimpPickable *pickable,
|
|
const GeglRectangle *rect,
|
|
const Babl *format,
|
|
gpointer pixel)
|
|
{
|
|
GimpPickableInterface *pickable_iface;
|
|
|
|
g_return_if_fail (GIMP_IS_PICKABLE (pickable));
|
|
g_return_if_fail (rect != NULL);
|
|
g_return_if_fail (pixel != NULL);
|
|
|
|
if (! format)
|
|
format = gimp_pickable_get_format (pickable);
|
|
|
|
pickable_iface = GIMP_PICKABLE_GET_IFACE (pickable);
|
|
|
|
if (pickable_iface->get_pixel_average)
|
|
pickable_iface->get_pixel_average (pickable, rect, format, pixel);
|
|
else
|
|
memset (pixel, 0, babl_format_get_bytes_per_pixel (format));
|
|
}
|
|
|
|
gboolean
|
|
gimp_pickable_get_color_at (GimpPickable *pickable,
|
|
gint x,
|
|
gint y,
|
|
GimpRGB *color)
|
|
{
|
|
gdouble pixel[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, NULL, pixel))
|
|
return FALSE;
|
|
|
|
gimp_pickable_pixel_to_rgb (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_IFACE (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_rgb (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_IFACE (pickable);
|
|
|
|
if (pickable_iface->pixel_to_rgb)
|
|
{
|
|
pickable_iface->pixel_to_rgb (pickable, format, pixel, color);
|
|
}
|
|
else
|
|
{
|
|
gimp_rgba_set_pixel (color, format, pixel);
|
|
}
|
|
}
|
|
|
|
void
|
|
gimp_pickable_rgb_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_IFACE (pickable);
|
|
|
|
if (pickable_iface->rgb_to_pixel)
|
|
{
|
|
pickable_iface->rgb_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_rgb_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);
|
|
g_return_val_if_fail (color != NULL, FALSE);
|
|
|
|
format = gimp_pickable_get_format (pickable);
|
|
|
|
if (! gimp_pickable_get_pixel_at (pickable, x, y, format, sample))
|
|
return FALSE;
|
|
|
|
if (pixel)
|
|
memcpy (pixel, sample, babl_format_get_bytes_per_pixel (format));
|
|
|
|
if (sample_average)
|
|
{
|
|
gint radius = floor (average_radius);
|
|
|
|
format = babl_format_with_space ("RaGaBaA double",
|
|
babl_format_get_space (format));
|
|
|
|
gimp_pickable_get_pixel_average (pickable,
|
|
GEGL_RECTANGLE (x - radius,
|
|
y - radius,
|
|
2 * radius + 1,
|
|
2 * radius + 1),
|
|
format, sample);
|
|
}
|
|
|
|
gimp_pickable_pixel_to_rgb (pickable, format, sample, color);
|
|
|
|
return TRUE;
|
|
}
|