194 lines
6.2 KiB
C
194 lines
6.2 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) 1995-2001 Spencer Kimball, Peter Mattis, and others
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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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#include "config.h"
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#include <cairo.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.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 "gegl/pika-babl.h"
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#include "gegl/pika-gegl-loops.h"
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#include "pika.h"
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#include "pikachannel.h"
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#include "pikacontainer.h"
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#include "pikadrawable.h"
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#include "pikaimage.h"
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#include "pikaimage-color-profile.h"
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#include "pikaimage-new.h"
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#include "pikaimage-pick-color.h"
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#include "pikalayer.h"
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#include "pikapickable.h"
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gboolean
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pika_image_pick_color (PikaImage *image,
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GList *drawables,
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gint x,
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gint y,
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gboolean show_all,
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gboolean sample_merged,
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gboolean sample_average,
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gdouble average_radius,
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const Babl **sample_format,
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gpointer pixel,
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PikaRGB *color)
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{
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PikaImage *pick_image = NULL;
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PikaPickable *pickable;
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GList *iter;
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gboolean result;
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g_return_val_if_fail (PIKA_IS_IMAGE (image), FALSE);
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for (iter = drawables; iter; iter = iter->next)
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{
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g_return_val_if_fail (PIKA_IS_DRAWABLE (iter->data), FALSE);
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g_return_val_if_fail (pika_item_get_image (iter->data) == image,
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FALSE);
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}
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if (sample_merged && g_list_length (drawables) == 1)
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{
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if ((PIKA_IS_LAYER (drawables->data) &&
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pika_image_get_n_layers (image) == 1) ||
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(PIKA_IS_CHANNEL (drawables->data) &&
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pika_image_get_n_channels (image) == 1))
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{
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/* Let's add a special exception when an image has only one
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* layer. This was useful in particular for indexed image as
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* it allows to pick the right index value even when "Sample
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* merged" is checked. There are more possible exceptions, but
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* we can't just take them all in considerations unless we
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* want to make code extra-complicated).
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* See #3041.
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*/
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sample_merged = FALSE;
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}
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}
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if (sample_merged)
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{
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if (! show_all)
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pickable = PIKA_PICKABLE (image);
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else
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pickable = PIKA_PICKABLE (pika_image_get_projection (image));
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}
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else
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{
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gboolean free_drawables = FALSE;
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if (! drawables)
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{
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drawables = pika_image_get_selected_drawables (image);
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free_drawables = TRUE;
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}
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if (! drawables)
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return FALSE;
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if (g_list_length (drawables) == 1)
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{
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gint off_x, off_y;
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pika_item_get_offset (PIKA_ITEM (drawables->data), &off_x, &off_y);
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x -= off_x;
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y -= off_y;
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pickable = PIKA_PICKABLE (drawables->data);
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}
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else /* length > 1 */
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{
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pick_image = pika_image_new_from_drawables (image->pika, drawables, FALSE, FALSE);
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pika_container_remove (image->pika->images, PIKA_OBJECT (pick_image));
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if (! show_all)
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pickable = PIKA_PICKABLE (pick_image);
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else
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pickable = PIKA_PICKABLE (pika_image_get_projection (pick_image));
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pika_pickable_flush (pickable);
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}
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if (free_drawables)
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g_list_free (drawables);
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}
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/* Do *not* call pika_pickable_flush() here because it's too expensive
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* to call it unconditionally each time e.g. the cursor view is updated.
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* Instead, call pika_pickable_flush() in the callers if needed.
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*/
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if (sample_format)
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*sample_format = pika_pickable_get_format (pickable);
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result = pika_pickable_pick_color (pickable, x, y,
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sample_average &&
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! (show_all && sample_merged),
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average_radius,
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pixel, color);
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if (show_all && sample_merged)
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{
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PikaColorProfile *profile = pika_image_get_color_profile (image);
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const Babl *space = NULL;
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gdouble sample[4] = {};
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const Babl *format;
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if (profile)
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space = pika_color_profile_get_space (profile,
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PIKA_COLOR_RENDERING_INTENT_RELATIVE_COLORIMETRIC,
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NULL);
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format = babl_format_with_space ("RaGaBaA double", space);
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if (! result)
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memset (pixel, 0, babl_format_get_bytes_per_pixel (*sample_format));
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if (sample_average)
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{
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GeglBuffer *buffer = pika_pickable_get_buffer (pickable);
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gint radius = floor (average_radius);
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pika_gegl_average_color (buffer,
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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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FALSE, GEGL_ABYSS_NONE, format, sample);
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}
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if (! result || sample_average)
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pika_pickable_pixel_to_rgb (pickable, format, sample, color);
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result = TRUE;
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}
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if (pick_image)
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g_object_unref (pick_image);
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return result;
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}
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