PIKApp/app/core/pikapickable.c

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2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* pikapickable.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 "libpikabase/pikabase.h"
#include "libpikacolor/pikacolor.h"
#include "libpikamath/pikamath.h"
#include "core-types.h"
#include "pikaobject.h"
#include "pikaimage.h"
#include "pikapickable.h"
/* local function prototypes */
static void pika_pickable_real_get_pixel_average (PikaPickable *pickable,
const GeglRectangle *rect,
const Babl *format,
gpointer pixel);
G_DEFINE_INTERFACE (PikaPickable, pika_pickable, PIKA_TYPE_OBJECT)
/* private functions */
static void
pika_pickable_default_init (PikaPickableInterface *iface)
{
iface->get_pixel_average = pika_pickable_real_get_pixel_average;
g_object_interface_install_property (iface,
g_param_spec_object ("buffer",
NULL, NULL,
GEGL_TYPE_BUFFER,
PIKA_PARAM_READABLE));
}
static void
pika_pickable_real_get_pixel_average (PikaPickable *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 (pika_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
pika_pickable_flush (PikaPickable *pickable)
{
PikaPickableInterface *pickable_iface;
g_return_if_fail (PIKA_IS_PICKABLE (pickable));
pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
if (pickable_iface->flush)
pickable_iface->flush (pickable);
}
PikaImage *
pika_pickable_get_image (PikaPickable *pickable)
{
PikaPickableInterface *pickable_iface;
g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), NULL);
pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
if (pickable_iface->get_image)
return pickable_iface->get_image (pickable);
return NULL;
}
const Babl *
pika_pickable_get_format (PikaPickable *pickable)
{
PikaPickableInterface *pickable_iface;
g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), NULL);
pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
if (pickable_iface->get_format)
return pickable_iface->get_format (pickable);
return NULL;
}
const Babl *
pika_pickable_get_format_with_alpha (PikaPickable *pickable)
{
PikaPickableInterface *pickable_iface;
g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), NULL);
pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
if (pickable_iface->get_format_with_alpha)
return pickable_iface->get_format_with_alpha (pickable);
return NULL;
}
GeglBuffer *
pika_pickable_get_buffer (PikaPickable *pickable)
{
PikaPickableInterface *pickable_iface;
g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), NULL);
pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
if (pickable_iface->get_buffer)
return pickable_iface->get_buffer (pickable);
return NULL;
}
gboolean
pika_pickable_get_pixel_at (PikaPickable *pickable,
gint x,
gint y,
const Babl *format,
gpointer pixel)
{
PikaPickableInterface *pickable_iface;
g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), FALSE);
g_return_val_if_fail (pixel != NULL, FALSE);
if (! format)
format = pika_pickable_get_format (pickable);
pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
if (pickable_iface->get_pixel_at)
return pickable_iface->get_pixel_at (pickable, x, y, format, pixel);
return FALSE;
}
void
pika_pickable_get_pixel_average (PikaPickable *pickable,
const GeglRectangle *rect,
const Babl *format,
gpointer pixel)
{
PikaPickableInterface *pickable_iface;
g_return_if_fail (PIKA_IS_PICKABLE (pickable));
g_return_if_fail (rect != NULL);
g_return_if_fail (pixel != NULL);
if (! format)
format = pika_pickable_get_format (pickable);
pickable_iface = PIKA_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
pika_pickable_get_color_at (PikaPickable *pickable,
gint x,
gint y,
PikaRGB *color)
{
gdouble pixel[4];
g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), FALSE);
g_return_val_if_fail (color != NULL, FALSE);
if (! pika_pickable_get_pixel_at (pickable, x, y, NULL, pixel))
return FALSE;
pika_pickable_pixel_to_rgb (pickable, NULL, pixel, color);
return TRUE;
}
gdouble
pika_pickable_get_opacity_at (PikaPickable *pickable,
gint x,
gint y)
{
PikaPickableInterface *pickable_iface;
g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), PIKA_OPACITY_TRANSPARENT);
pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
if (pickable_iface->get_opacity_at)
return pickable_iface->get_opacity_at (pickable, x, y);
return PIKA_OPACITY_TRANSPARENT;
}
void
pika_pickable_pixel_to_rgb (PikaPickable *pickable,
const Babl *format,
gpointer pixel,
PikaRGB *color)
{
PikaPickableInterface *pickable_iface;
g_return_if_fail (PIKA_IS_PICKABLE (pickable));
g_return_if_fail (pixel != NULL);
g_return_if_fail (color != NULL);
if (! format)
format = pika_pickable_get_format (pickable);
pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
if (pickable_iface->pixel_to_rgb)
{
pickable_iface->pixel_to_rgb (pickable, format, pixel, color);
}
else
{
pika_rgba_set_pixel (color, format, pixel);
}
}
void
pika_pickable_rgb_to_pixel (PikaPickable *pickable,
const PikaRGB *color,
const Babl *format,
gpointer pixel)
{
PikaPickableInterface *pickable_iface;
g_return_if_fail (PIKA_IS_PICKABLE (pickable));
g_return_if_fail (color != NULL);
g_return_if_fail (pixel != NULL);
if (! format)
format = pika_pickable_get_format (pickable);
pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
if (pickable_iface->rgb_to_pixel)
{
pickable_iface->rgb_to_pixel (pickable, color, format, pixel);
}
else
{
pika_rgba_get_pixel (color, format, pixel);
}
}
void
pika_pickable_srgb_to_image_color (PikaPickable *pickable,
const PikaRGB *color,
PikaRGB *image_color)
{
g_return_if_fail (PIKA_IS_PICKABLE (pickable));
g_return_if_fail (color != NULL);
g_return_if_fail (image_color != NULL);
pika_pickable_rgb_to_pixel (pickable,
color,
babl_format ("R'G'B'A double"),
image_color);
}
gboolean
pika_pickable_pick_color (PikaPickable *pickable,
gint x,
gint y,
gboolean sample_average,
gdouble average_radius,
gpointer pixel,
PikaRGB *color)
{
const Babl *format;
gdouble sample[4];
g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), FALSE);
g_return_val_if_fail (color != NULL, FALSE);
format = pika_pickable_get_format (pickable);
if (! pika_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));
pika_pickable_get_pixel_average (pickable,
GEGL_RECTANGLE (x - radius,
y - radius,
2 * radius + 1,
2 * radius + 1),
format, sample);
}
pika_pickable_pixel_to_rgb (pickable, format, sample, color);
return TRUE;
}