PIKApp/app/tools/pikaregionselecttool.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
*
* pikaregionselecttool.c
*
* 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/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libpikawidgets/pikawidgets.h"
#include "tools-types.h"
#include "core/pika-utils.h"
#include "core/pikaboundary.h"
#include "core/pikachannel.h"
#include "core/pikachannel-select.h"
#include "core/pikaimage.h"
#include "core/pikalayer-floating-selection.h"
#include "display/pikadisplay.h"
#include "display/pikadisplayshell.h"
#include "display/pikadisplayshell-cursor.h"
#include "pikaregionselectoptions.h"
#include "pikaregionselecttool.h"
#include "pikatoolcontrol.h"
#include "pika-intl.h"
static void pika_region_select_tool_finalize (GObject *object);
static void pika_region_select_tool_button_press (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonPressType press_type,
PikaDisplay *display);
static void pika_region_select_tool_button_release (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonReleaseType release_type,
PikaDisplay *display);
static void pika_region_select_tool_motion (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaDisplay *display);
static void pika_region_select_tool_cursor_update (PikaTool *tool,
const PikaCoords *coords,
GdkModifierType state,
PikaDisplay *display);
static void pika_region_select_tool_draw (PikaDrawTool *draw_tool);
static void pika_region_select_tool_get_mask (PikaRegionSelectTool *region_sel,
PikaDisplay *display);
G_DEFINE_TYPE (PikaRegionSelectTool, pika_region_select_tool,
PIKA_TYPE_SELECTION_TOOL)
#define parent_class pika_region_select_tool_parent_class
static void
pika_region_select_tool_class_init (PikaRegionSelectToolClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaToolClass *tool_class = PIKA_TOOL_CLASS (klass);
PikaDrawToolClass *draw_tool_class = PIKA_DRAW_TOOL_CLASS (klass);
object_class->finalize = pika_region_select_tool_finalize;
tool_class->button_press = pika_region_select_tool_button_press;
tool_class->button_release = pika_region_select_tool_button_release;
tool_class->motion = pika_region_select_tool_motion;
tool_class->cursor_update = pika_region_select_tool_cursor_update;
draw_tool_class->draw = pika_region_select_tool_draw;
}
static void
pika_region_select_tool_init (PikaRegionSelectTool *region_select)
{
PikaTool *tool = PIKA_TOOL (region_select);
pika_tool_control_set_scroll_lock (tool->control, TRUE);
region_select->x = 0;
region_select->y = 0;
region_select->saved_threshold = 0.0;
region_select->region_mask = NULL;
region_select->segs = NULL;
region_select->n_segs = 0;
}
static void
pika_region_select_tool_finalize (GObject *object)
{
PikaRegionSelectTool *region_sel = PIKA_REGION_SELECT_TOOL (object);
g_clear_object (&region_sel->region_mask);
g_clear_pointer (&region_sel->segs, g_free);
region_sel->n_segs = 0;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_region_select_tool_button_press (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonPressType press_type,
PikaDisplay *display)
{
PikaRegionSelectTool *region_sel = PIKA_REGION_SELECT_TOOL (tool);
PikaRegionSelectOptions *options = PIKA_REGION_SELECT_TOOL_GET_OPTIONS (tool);
region_sel->x = coords->x;
region_sel->y = coords->y;
region_sel->saved_threshold = options->threshold;
if (pika_selection_tool_start_edit (PIKA_SELECTION_TOOL (region_sel),
display, coords))
{
return;
}
pika_tool_control_activate (tool->control);
tool->display = display;
pika_tool_push_status (tool, display,
_("Move the mouse to change threshold"));
pika_region_select_tool_get_mask (region_sel, display);
pika_draw_tool_start (PIKA_DRAW_TOOL (tool), display);
}
static void
pika_region_select_tool_button_release (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonReleaseType release_type,
PikaDisplay *display)
{
PikaRegionSelectTool *region_sel = PIKA_REGION_SELECT_TOOL (tool);
PikaSelectionOptions *sel_options = PIKA_SELECTION_TOOL_GET_OPTIONS (tool);
PikaRegionSelectOptions *options = PIKA_REGION_SELECT_TOOL_GET_OPTIONS (tool);
PikaImage *image = pika_display_get_image (display);
pika_tool_pop_status (tool, display);
pika_draw_tool_stop (PIKA_DRAW_TOOL (tool));
pika_tool_control_halt (tool->control);
if (options->draw_mask)
pika_display_shell_set_mask (pika_display_get_shell (display),
NULL, 0, 0, NULL, FALSE);
if (release_type != PIKA_BUTTON_RELEASE_CANCEL)
{
if (PIKA_SELECTION_TOOL (tool)->function == SELECTION_ANCHOR)
{
if (pika_image_get_floating_selection (image))
{
/* If there is a floating selection, anchor it */
floating_sel_anchor (pika_image_get_floating_selection (image));
}
else
{
/* Otherwise, clear the selection mask */
pika_channel_clear (pika_image_get_mask (image), NULL, TRUE);
}
pika_image_flush (image);
}
else if (region_sel->region_mask)
{
gint off_x = 0;
gint off_y = 0;
if (! options->sample_merged)
{
GList *drawables = pika_image_get_selected_drawables (image);
if (g_list_length (drawables) == 1)
pika_item_get_offset (drawables->data, &off_x, &off_y);
g_list_free (drawables);
}
pika_channel_select_buffer (pika_image_get_mask (image),
PIKA_REGION_SELECT_TOOL_GET_CLASS (tool)->undo_desc,
region_sel->region_mask,
off_x,
off_y,
sel_options->operation,
sel_options->feather,
sel_options->feather_radius,
sel_options->feather_radius);
pika_image_flush (image);
}
}
g_clear_object (&region_sel->region_mask);
g_clear_pointer (&region_sel->segs, g_free);
region_sel->n_segs = 0;
/* Restore the original threshold */
g_object_set (options,
"threshold", region_sel->saved_threshold,
NULL);
}
static void
pika_region_select_tool_motion (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaDisplay *display)
{
PikaRegionSelectTool *region_sel = PIKA_REGION_SELECT_TOOL (tool);
PikaRegionSelectOptions *options = PIKA_REGION_SELECT_TOOL_GET_OPTIONS (tool);
gint diff_x, diff_y;
gdouble diff;
static guint32 last_time = 0;
/* don't let the events come in too fast, ignore below a delay of 100 ms */
if (time - last_time < 100)
return;
last_time = time;
diff_x = coords->x - region_sel->x;
diff_y = coords->y - region_sel->y;
diff = ((ABS (diff_x) > ABS (diff_y)) ? diff_x : diff_y) / 2.0;
g_object_set (options,
"threshold", CLAMP (region_sel->saved_threshold + diff, 0, 255),
NULL);
pika_draw_tool_pause (PIKA_DRAW_TOOL (tool));
pika_region_select_tool_get_mask (region_sel, display);
pika_draw_tool_resume (PIKA_DRAW_TOOL (tool));
}
static void
pika_region_select_tool_cursor_update (PikaTool *tool,
const PikaCoords *coords,
GdkModifierType state,
PikaDisplay *display)
{
PikaRegionSelectOptions *options = PIKA_REGION_SELECT_TOOL_GET_OPTIONS (tool);
PikaCursorModifier modifier = PIKA_CURSOR_MODIFIER_NONE;
PikaImage *image = pika_display_get_image (display);
if (! pika_image_coords_in_active_pickable (image, coords,
FALSE, options->sample_merged,
FALSE))
modifier = PIKA_CURSOR_MODIFIER_BAD;
pika_tool_control_set_cursor_modifier (tool->control, modifier);
PIKA_TOOL_CLASS (parent_class)->cursor_update (tool, coords, state, display);
}
static void
pika_region_select_tool_draw (PikaDrawTool *draw_tool)
{
PikaRegionSelectTool *region_sel = PIKA_REGION_SELECT_TOOL (draw_tool);
PikaRegionSelectOptions *options = PIKA_REGION_SELECT_TOOL_GET_OPTIONS (draw_tool);
if (! options->draw_mask && region_sel->region_mask)
{
if (! region_sel->segs)
{
/* calculate and allocate a new segment array which represents
* the boundary of the contiguous region
*/
region_sel->segs = pika_boundary_find (region_sel->region_mask, NULL,
babl_format ("Y float"),
PIKA_BOUNDARY_WITHIN_BOUNDS,
0, 0,
gegl_buffer_get_width (region_sel->region_mask),
gegl_buffer_get_height (region_sel->region_mask),
PIKA_BOUNDARY_HALF_WAY,
&region_sel->n_segs);
}
if (region_sel->segs)
{
gint off_x = 0;
gint off_y = 0;
if (! options->sample_merged)
{
PikaImage *image = pika_display_get_image (draw_tool->display);
GList *drawables = pika_image_get_selected_drawables (image);
if (g_list_length (drawables) == 1)
pika_item_get_offset (drawables->data, &off_x, &off_y);
g_list_free (drawables);
}
pika_draw_tool_add_boundary (draw_tool,
region_sel->segs,
region_sel->n_segs,
NULL,
off_x, off_y);
}
}
}
static void
pika_region_select_tool_get_mask (PikaRegionSelectTool *region_sel,
PikaDisplay *display)
{
PikaRegionSelectOptions *options = PIKA_REGION_SELECT_TOOL_GET_OPTIONS (region_sel);
PikaDisplayShell *shell = pika_display_get_shell (display);
pika_display_shell_set_override_cursor (shell, (PikaCursorType) GDK_WATCH);
g_clear_pointer (&region_sel->segs, g_free);
region_sel->n_segs = 0;
if (region_sel->region_mask)
g_object_unref (region_sel->region_mask);
region_sel->region_mask =
PIKA_REGION_SELECT_TOOL_GET_CLASS (region_sel)->get_mask (region_sel,
display);
if (options->draw_mask)
{
if (region_sel->region_mask)
{
PikaRGB color = { 1.0, 0.0, 1.0, 1.0 };
gint off_x = 0;
gint off_y = 0;
if (! options->sample_merged)
{
PikaImage *image = pika_display_get_image (display);
GList *drawables = pika_image_get_selected_drawables (image);
if (g_list_length (drawables) == 1)
pika_item_get_offset (drawables->data, &off_x, &off_y);
g_list_free (drawables);
}
pika_display_shell_set_mask (shell, region_sel->region_mask,
off_x, off_y, &color, FALSE);
}
else
{
pika_display_shell_set_mask (shell, NULL, 0, 0, NULL, FALSE);
}
}
pika_display_shell_unset_override_cursor (shell);
}