185 lines
6.2 KiB
C
185 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 Spencer Kimball and Peter Mattis
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*
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* IfsCompose is a interface for creating IFS fractals by
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* direct manipulation.
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* Copyright (C) 1997 Owen Taylor
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*
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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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typedef struct {
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gdouble a11,a12,a21,a22,b1,b2;
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} Aff2;
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typedef struct {
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gdouble vals[3][4];
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} Aff3;
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typedef struct {
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GdkPoint *points;
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gint npoints;
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} IPolygon;
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typedef struct {
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gdouble x, y;
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gdouble theta;
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gdouble scale;
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gdouble asym;
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gdouble shear;
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gint flip;
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PikaRGB red_color;
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PikaRGB green_color;
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PikaRGB blue_color;
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PikaRGB black_color;
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PikaRGB target_color;
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gdouble hue_scale;
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gdouble value_scale;
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gint simple_color;
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gdouble prob;
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} AffElementVals;
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typedef struct
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{
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gint num_elements;
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gint iterations;
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gint max_memory;
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gint subdivide;
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gdouble radius;
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gdouble aspect_ratio;
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gdouble center_x;
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gdouble center_y;
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} IfsComposeVals;
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typedef struct {
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AffElementVals v;
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Aff2 trans;
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Aff3 color_trans;
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gchar *name;
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IPolygon *click_boundary;
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IPolygon *draw_boundary;
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} AffElement;
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/* manipulation of affine transforms */
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void aff2_translate (Aff2 *naff,
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gdouble x,
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gdouble y);
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void aff2_rotate (Aff2 *naff,
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gdouble theta);
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void aff2_scale (Aff2 *naff,
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gdouble s,
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gint flip);
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void aff2_distort (Aff2 *naff,
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gdouble asym,
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gdouble shear);
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void aff2_compute_stretch (Aff2 *naff,
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gdouble xo,
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gdouble yo,
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gdouble xn,
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gdouble yn);
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void aff2_compute_distort (Aff2 *naff,
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gdouble xo,
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gdouble yo,
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gdouble xn,
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gdouble yn);
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void aff2_compose (Aff2 *naff,
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Aff2 *aff1,
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Aff2 *aff2);
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void aff2_invert (Aff2 *naff,
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Aff2 *aff);
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void aff2_apply (Aff2 *aff,
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gdouble x,
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gdouble y,
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gdouble *xf,
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gdouble *yf);
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void aff2_fixed_point (Aff2 *aff,
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gdouble *xf,
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gdouble *yf);
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void aff3_apply (Aff3 *t,
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gdouble x,
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gdouble y,
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gdouble z,
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gdouble *xf,
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gdouble *yf,
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gdouble *zf);
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/* manipulation of polygons */
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IPolygon *ipolygon_convex_hull (IPolygon *poly);
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gint ipolygon_contains (IPolygon *poly,
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gint xt,
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gint yt);
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/* manipulation of composite transforms */
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AffElement *aff_element_new (gdouble x,
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gdouble y,
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PikaRGB *color,
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gint count);
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void aff_element_free (AffElement *elem);
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void aff_element_compute_trans (AffElement *elem,
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gdouble width,
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gdouble height,
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gdouble center_x,
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gdouble center_y);
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void aff_element_compute_color_trans (AffElement *elem);
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void aff_element_decompose_trans (AffElement *elem,
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Aff2 *aff,
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gdouble width,
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gdouble height,
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gdouble center_x,
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gdouble center_y);
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void aff_element_compute_boundary (AffElement *elem,
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gint width,
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gint height,
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AffElement **elements,
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gint num_elements);
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void aff_element_draw (AffElement *elem,
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gint selected,
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gint width,
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gint height,
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cairo_t *cr,
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GdkRGBA *color,
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PangoLayout *layout);
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void ifs_render (AffElement **elements,
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gint num_elements,
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gint width,
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gint height,
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gint nsteps,
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IfsComposeVals *vals,
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gint band_y,
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gint band_height,
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guchar *data,
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guchar *mask,
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guchar *nhits,
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gboolean preview);
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gchar * ifsvals_stringify (IfsComposeVals *vals,
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AffElement **elements);
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gboolean ifsvals_parse_string (const gchar *str,
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IfsComposeVals *vals,
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AffElement ***elements);
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