PIKApp/app/paint/pikaeraser.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
*
* 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 <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "paint-types.h"
#include "gegl/pika-gegl-utils.h"
#include "core/pika.h"
#include "core/pika-palettes.h"
#include "core/pikadrawable.h"
#include "core/pikadynamics.h"
#include "core/pikaimage.h"
#include "core/pikapickable.h"
#include "core/pikasymmetry.h"
#include "pikaeraser.h"
#include "pikaeraseroptions.h"
#include "pika-intl.h"
static gboolean pika_eraser_get_color_history_color (PikaPaintbrush *paintbrush,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaRGB *color);
static void pika_eraser_get_paint_params (PikaPaintbrush *paintbrush,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaSymmetry *sym,
gdouble grad_point,
PikaLayerMode *paint_mode,
PikaPaintApplicationMode *paint_appl_mode,
const PikaTempBuf **paint_pixmap,
PikaRGB *paint_color);
G_DEFINE_TYPE (PikaEraser, pika_eraser, PIKA_TYPE_PAINTBRUSH)
void
pika_eraser_register (Pika *pika,
PikaPaintRegisterCallback callback)
{
(* callback) (pika,
PIKA_TYPE_ERASER,
PIKA_TYPE_ERASER_OPTIONS,
"pika-eraser",
_("Eraser"),
"pika-tool-eraser");
}
static void
pika_eraser_class_init (PikaEraserClass *klass)
{
PikaPaintbrushClass *paintbrush_class = PIKA_PAINTBRUSH_CLASS (klass);
paintbrush_class->get_color_history_color = pika_eraser_get_color_history_color;
paintbrush_class->get_paint_params = pika_eraser_get_paint_params;
}
static void
pika_eraser_init (PikaEraser *eraser)
{
}
static gboolean
pika_eraser_get_color_history_color (PikaPaintbrush *paintbrush,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaRGB *color)
{
/* Erasing on a drawable without alpha is equivalent to
* drawing with background color. So let's save history.
*/
if (! pika_drawable_has_alpha (drawable))
{
PikaContext *context = PIKA_CONTEXT (paint_options);
pika_context_get_background (context, color);
return TRUE;
}
return FALSE;
}
static void
pika_eraser_get_paint_params (PikaPaintbrush *paintbrush,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaSymmetry *sym,
gdouble grad_point,
PikaLayerMode *paint_mode,
PikaPaintApplicationMode *paint_appl_mode,
const PikaTempBuf **paint_pixmap,
PikaRGB *paint_color)
{
PikaEraserOptions *options = PIKA_ERASER_OPTIONS (paint_options);
PikaContext *context = PIKA_CONTEXT (paint_options);
pika_context_get_background (context, paint_color);
pika_pickable_srgb_to_image_color (PIKA_PICKABLE (drawable),
paint_color, paint_color);
if (options->anti_erase)
*paint_mode = PIKA_LAYER_MODE_ANTI_ERASE;
else if (pika_drawable_has_alpha (drawable))
*paint_mode = PIKA_LAYER_MODE_ERASE;
else
*paint_mode = PIKA_LAYER_MODE_NORMAL_LEGACY;
}