388 lines
11 KiB
C
388 lines
11 KiB
C
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/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikapickable.c
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* Copyright (C) 2004 Michael Natterer <mitch@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/* This file contains an interface for pixel objects that their color at
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* a given position can be picked. Also included is a utility for
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* sampling an average area (which uses the implemented picking
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* functions).
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*/
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#include "config.h"
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#include <string.h>
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#include <cairo.h>
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#include <gegl.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "libpikabase/pikabase.h"
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#include "libpikacolor/pikacolor.h"
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#include "libpikamath/pikamath.h"
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#include "core-types.h"
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#include "pikaobject.h"
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#include "pikaimage.h"
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#include "pikapickable.h"
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/* local function prototypes */
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static void pika_pickable_real_get_pixel_average (PikaPickable *pickable,
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const GeglRectangle *rect,
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const Babl *format,
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gpointer pixel);
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G_DEFINE_INTERFACE (PikaPickable, pika_pickable, PIKA_TYPE_OBJECT)
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/* private functions */
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static void
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pika_pickable_default_init (PikaPickableInterface *iface)
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{
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iface->get_pixel_average = pika_pickable_real_get_pixel_average;
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g_object_interface_install_property (iface,
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g_param_spec_object ("buffer",
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NULL, NULL,
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GEGL_TYPE_BUFFER,
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PIKA_PARAM_READABLE));
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}
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static void
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pika_pickable_real_get_pixel_average (PikaPickable *pickable,
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const GeglRectangle *rect,
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const Babl *format,
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gpointer pixel)
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{
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const Babl *average_format;
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gdouble average[4] = { 0, };
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gint n = 0;
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gint x;
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gint y;
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gint c;
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average_format = babl_format_with_space ("RaGaBaA double",
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babl_format_get_space (format));
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for (y = rect->y; y < rect->y + rect->height; y++)
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{
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for (x = rect->x; x < rect->x + rect->width; x++)
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{
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gdouble sample[4];
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if (pika_pickable_get_pixel_at (pickable,
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x, y, average_format, sample))
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{
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for (c = 0; c < 4; c++)
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average[c] += sample[c];
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n++;
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}
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}
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}
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if (n > 0)
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{
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for (c = 0; c < 4; c++)
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average[c] /= n;
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}
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babl_process (babl_fish (average_format, format), average, pixel, 1);
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}
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/* public functions */
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void
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pika_pickable_flush (PikaPickable *pickable)
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{
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PikaPickableInterface *pickable_iface;
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g_return_if_fail (PIKA_IS_PICKABLE (pickable));
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pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
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if (pickable_iface->flush)
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pickable_iface->flush (pickable);
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}
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PikaImage *
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pika_pickable_get_image (PikaPickable *pickable)
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{
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PikaPickableInterface *pickable_iface;
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g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), NULL);
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pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
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if (pickable_iface->get_image)
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return pickable_iface->get_image (pickable);
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return NULL;
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}
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const Babl *
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pika_pickable_get_format (PikaPickable *pickable)
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{
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PikaPickableInterface *pickable_iface;
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g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), NULL);
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pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
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if (pickable_iface->get_format)
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return pickable_iface->get_format (pickable);
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return NULL;
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}
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const Babl *
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pika_pickable_get_format_with_alpha (PikaPickable *pickable)
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{
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PikaPickableInterface *pickable_iface;
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g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), NULL);
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pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
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if (pickable_iface->get_format_with_alpha)
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return pickable_iface->get_format_with_alpha (pickable);
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return NULL;
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}
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GeglBuffer *
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pika_pickable_get_buffer (PikaPickable *pickable)
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{
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PikaPickableInterface *pickable_iface;
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g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), NULL);
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pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
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if (pickable_iface->get_buffer)
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return pickable_iface->get_buffer (pickable);
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return NULL;
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}
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gboolean
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pika_pickable_get_pixel_at (PikaPickable *pickable,
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gint x,
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gint y,
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const Babl *format,
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gpointer pixel)
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{
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PikaPickableInterface *pickable_iface;
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g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), FALSE);
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g_return_val_if_fail (pixel != NULL, FALSE);
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if (! format)
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format = pika_pickable_get_format (pickable);
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pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
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if (pickable_iface->get_pixel_at)
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return pickable_iface->get_pixel_at (pickable, x, y, format, pixel);
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return FALSE;
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}
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void
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pika_pickable_get_pixel_average (PikaPickable *pickable,
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const GeglRectangle *rect,
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const Babl *format,
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gpointer pixel)
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{
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PikaPickableInterface *pickable_iface;
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g_return_if_fail (PIKA_IS_PICKABLE (pickable));
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g_return_if_fail (rect != NULL);
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g_return_if_fail (pixel != NULL);
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if (! format)
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format = pika_pickable_get_format (pickable);
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pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
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if (pickable_iface->get_pixel_average)
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pickable_iface->get_pixel_average (pickable, rect, format, pixel);
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else
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memset (pixel, 0, babl_format_get_bytes_per_pixel (format));
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}
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gboolean
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pika_pickable_get_color_at (PikaPickable *pickable,
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gint x,
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gint y,
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PikaRGB *color)
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{
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gdouble pixel[4];
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g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), FALSE);
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g_return_val_if_fail (color != NULL, FALSE);
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if (! pika_pickable_get_pixel_at (pickable, x, y, NULL, pixel))
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return FALSE;
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pika_pickable_pixel_to_rgb (pickable, NULL, pixel, color);
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return TRUE;
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}
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gdouble
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pika_pickable_get_opacity_at (PikaPickable *pickable,
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gint x,
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gint y)
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{
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PikaPickableInterface *pickable_iface;
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g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), PIKA_OPACITY_TRANSPARENT);
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pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
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if (pickable_iface->get_opacity_at)
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return pickable_iface->get_opacity_at (pickable, x, y);
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return PIKA_OPACITY_TRANSPARENT;
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}
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void
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pika_pickable_pixel_to_rgb (PikaPickable *pickable,
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const Babl *format,
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gpointer pixel,
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PikaRGB *color)
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{
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PikaPickableInterface *pickable_iface;
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g_return_if_fail (PIKA_IS_PICKABLE (pickable));
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g_return_if_fail (pixel != NULL);
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g_return_if_fail (color != NULL);
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if (! format)
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format = pika_pickable_get_format (pickable);
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pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
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if (pickable_iface->pixel_to_rgb)
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{
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pickable_iface->pixel_to_rgb (pickable, format, pixel, color);
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}
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else
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{
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pika_rgba_set_pixel (color, format, pixel);
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}
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}
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void
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pika_pickable_rgb_to_pixel (PikaPickable *pickable,
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const PikaRGB *color,
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const Babl *format,
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gpointer pixel)
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{
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PikaPickableInterface *pickable_iface;
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g_return_if_fail (PIKA_IS_PICKABLE (pickable));
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g_return_if_fail (color != NULL);
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g_return_if_fail (pixel != NULL);
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if (! format)
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format = pika_pickable_get_format (pickable);
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pickable_iface = PIKA_PICKABLE_GET_IFACE (pickable);
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if (pickable_iface->rgb_to_pixel)
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{
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pickable_iface->rgb_to_pixel (pickable, color, format, pixel);
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}
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else
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{
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pika_rgba_get_pixel (color, format, pixel);
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}
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}
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void
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pika_pickable_srgb_to_image_color (PikaPickable *pickable,
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const PikaRGB *color,
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PikaRGB *image_color)
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{
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g_return_if_fail (PIKA_IS_PICKABLE (pickable));
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g_return_if_fail (color != NULL);
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g_return_if_fail (image_color != NULL);
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pika_pickable_rgb_to_pixel (pickable,
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color,
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babl_format ("R'G'B'A double"),
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image_color);
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}
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gboolean
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pika_pickable_pick_color (PikaPickable *pickable,
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gint x,
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gint y,
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gboolean sample_average,
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gdouble average_radius,
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gpointer pixel,
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PikaRGB *color)
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{
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const Babl *format;
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gdouble sample[4];
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g_return_val_if_fail (PIKA_IS_PICKABLE (pickable), FALSE);
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g_return_val_if_fail (color != NULL, FALSE);
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format = pika_pickable_get_format (pickable);
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if (! pika_pickable_get_pixel_at (pickable, x, y, format, sample))
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return FALSE;
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if (pixel)
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memcpy (pixel, sample, babl_format_get_bytes_per_pixel (format));
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if (sample_average)
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{
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gint radius = floor (average_radius);
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format = babl_format_with_space ("RaGaBaA double",
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babl_format_get_space (format));
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pika_pickable_get_pixel_average (pickable,
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GEGL_RECTANGLE (x - radius,
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y - radius,
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2 * radius + 1,
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2 * radius + 1),
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format, sample);
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}
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pika_pickable_pixel_to_rgb (pickable, format, sample, color);
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return TRUE;
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}
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