PIKApp/app/vectors/pikavectors-preview.c

98 lines
2.8 KiB
C

/* 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 <string.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "vectors-types.h"
#include "libpikamath/pikamath.h"
#include "core/pikaimage.h"
#include "core/pikatempbuf.h"
#include "pikastroke.h"
#include "pikavectors.h"
#include "pikavectors-preview.h"
/* public functions */
PikaTempBuf *
pika_vectors_get_new_preview (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height)
{
PikaVectors *vectors;
PikaItem *item;
PikaStroke *cur_stroke;
gdouble xscale, yscale;
guchar *data;
PikaTempBuf *temp_buf;
vectors = PIKA_VECTORS (viewable);
item = PIKA_ITEM (viewable);
xscale = ((gdouble) width) / pika_image_get_width (pika_item_get_image (item));
yscale = ((gdouble) height) / pika_image_get_height (pika_item_get_image (item));
temp_buf = pika_temp_buf_new (width, height, babl_format ("Y' u8"));
data = pika_temp_buf_get_data (temp_buf);
memset (data, 255, width * height);
for (cur_stroke = pika_vectors_stroke_get_next (vectors, NULL);
cur_stroke;
cur_stroke = pika_vectors_stroke_get_next (vectors, cur_stroke))
{
GArray *coords;
gboolean closed;
gint i;
coords = pika_stroke_interpolate (cur_stroke, 0.5, &closed);
if (coords)
{
for (i = 0; i < coords->len; i++)
{
PikaCoords point;
gint x, y;
point = g_array_index (coords, PikaCoords, i);
x = ROUND (point.x * xscale);
y = ROUND (point.y * yscale);
if (x >= 0 && y >= 0 && x < width && y < height)
data[y * width + x] = 0;
}
g_array_free (coords, TRUE);
}
}
return temp_buf;
}