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gimp/plug-ins/common/cubism.c

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/* Cubism --- image filter plug-in for The Gimp image manipulation program
* Copyright (C) 1996 Spencer Kimball, Tracy Scott
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* You can contact me at quartic@polloux.fciencias.unam.mx
* You can contact the original The Gimp authors at gimp@xcf.berkeley.edu
*/
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "gtk/gtk.h"
#include "libgimp/gimp.h"
/* Some useful macros */
#define SQR(a) ((a) * (a))
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif /* M_PI */
#ifndef RAND_MAX
#define RAND_MAX 2147483647
#endif /* RAND_MAX */
#define SCALE_WIDTH 125
#define BLACK 0
#define BG 1
#define SUPERSAMPLE 3
#define MAX_POINTS 4
#define MIN_ANGLE -36000
#define MAX_ANGLE 36000
#define RANDOMNESS 5
typedef struct
{
gdouble x, y;
} Vertex;
typedef struct
{
gint npts;
Vertex pts[MAX_POINTS];
} Polygon;
typedef struct
{
gdouble tile_size;
gdouble tile_saturation;
gint bg_color;
} CubismVals;
typedef struct
{
gint run;
} CubismInterface;
/* Declare local functions.
*/
static void query (void);
static void run (char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals);
static void cubism (GDrawable *drawable);
static gint cubism_dialog (void);
static void render_cubism (GDrawable * drawable);
static void fill_poly_color (Polygon * poly,
GDrawable * drawable,
guchar * col);
static void convert_segment (gint x1,
gint y1,
gint x2,
gint y2,
gint offset,
gint * min,
gint * max);
static void randomize_indices (gint count,
gint * indices);
static gdouble fp_rand (gdouble val);
static gint int_rand (gint val);
static gdouble calc_alpha_blend (gdouble * vec,
gdouble dist,
gdouble x,
gdouble y);
static void polygon_add_point (Polygon * poly,
gdouble x,
gdouble y);
static void polygon_translate (Polygon * poly,
gdouble tx,
gdouble ty);
static void polygon_rotate (Polygon * poly,
gdouble theta);
static gint polygon_extents (Polygon * poly,
gdouble * min_x,
gdouble * min_y,
gdouble * max_x,
gdouble * max_y);
static void polygon_reset (Polygon * poly);
static void cubism_close_callback (GtkWidget *widget,
gpointer data);
static void cubism_ok_callback (GtkWidget *widget,
gpointer data);
static void cubism_toggle_update (GtkWidget *widget,
gpointer data);
static void cubism_scale_update (GtkAdjustment *adjustment,
double *scale_val);
/*
* Local variables
*/
static guchar bg_col[4];
static CubismVals cvals =
{
10.0, /* tile_size */
2.5, /* tile_saturation */
BLACK /* bg_color */
};
static CubismInterface cint =
{
FALSE /* run */
};
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
/*
* Functions
*/
MAIN ()
static void
query ()
{
static GParamDef args[] =
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "Input image" },
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
{ PARAM_FLOAT, "tile_size", "Average diameter of each tile (in pixels)" },
{ PARAM_FLOAT, "tile_saturation", "Expand tiles by this amount" },
{ PARAM_INT32, "bg_color", "Background color: { BLACK (0), BG (1) }" }
};
static GParamDef *return_vals = NULL;
static int nargs = sizeof (args) / sizeof (args[0]);
static int nreturn_vals = 0;
gimp_install_procedure ("plug_in_cubism",
"Convert the input drawable into a collection of rotated squares",
"Help not yet written for this plug-in",
"Spencer Kimball & Tracy Scott",
"Spencer Kimball & Tracy Scott",
"1996",
"<Image>/Filters/Artistic/Cubism",
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
}
static void
run (char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals)
{
static GParam values[1];
GDrawable *active_drawable;
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
switch (run_mode)
{
case RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data ("plug_in_cubism", &cvals);
/* First acquire information with a dialog */
if (! cubism_dialog ())
return;
break;
case RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 6)
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS)
{
cvals.tile_size = param[3].data.d_float;
cvals.tile_saturation = param[4].data.d_float;
cvals.bg_color = param[5].data.d_int32;
}
if (status == STATUS_SUCCESS &&
(cvals.bg_color < BLACK || cvals.bg_color > BG))
status = STATUS_CALLING_ERROR;
break;
case RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data ("plug_in_cubism", &cvals);
break;
default:
break;
}
/* get the active drawable */
active_drawable = gimp_drawable_get (param[2].data.d_drawable);
/* Render the cubism effect */
if ((status == STATUS_SUCCESS) &&
(gimp_drawable_color (active_drawable->id) || gimp_drawable_gray (active_drawable->id)))
{
/* set cache size */
gimp_tile_cache_ntiles (SQR (4 * cvals.tile_size * cvals.tile_saturation) / SQR (gimp_tile_width ()));
cubism (active_drawable);
/* If the run mode is interactive, flush the displays */
if (run_mode != RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store mvals data */
if (run_mode == RUN_INTERACTIVE)
gimp_set_data ("plug_in_cubism", &cvals, sizeof (CubismVals));
}
else if (status == STATUS_SUCCESS)
{
/* gimp_message ("cubism: cannot operate on indexed color images"); */
status = STATUS_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (active_drawable);
}
static void
cubism (GDrawable *drawable)
{
gint x1, y1, x2, y2;
/* find the drawable mask bounds */
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
/* determine the background color */
if (cvals.bg_color == BLACK)
bg_col[0] = bg_col[1] = bg_col[2] = 0;
else
gimp_palette_get_background (&bg_col[0], &bg_col[1], &bg_col[2]);
if (gimp_drawable_has_alpha (drawable->id))
bg_col[drawable->bpp - 1] = 0;
gimp_progress_init ("Cubistic Transformation");
/* render the cubism */
render_cubism (drawable);
/* merge the shadow, update the drawable */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->id, TRUE);
gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
}
static gint
cubism_dialog ()
{
GtkWidget *dlg;
GtkWidget *label;
GtkWidget *button;
GtkWidget *toggle;
GtkWidget *scale;
GtkWidget *frame;
GtkWidget *table;
GtkObject *scale_data;
gchar **argv;
gint argc;
argc = 1;
argv = g_new (gchar *, 1);
argv[0] = g_strdup ("cubism");
gtk_init (&argc, &argv);
gtk_rc_parse (gimp_gtkrc ());
dlg = gtk_dialog_new ();
gtk_window_set_title (GTK_WINDOW (dlg), "Cubism");
gtk_window_position (GTK_WINDOW (dlg), GTK_WIN_POS_MOUSE);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
(GtkSignalFunc) cubism_close_callback,
NULL);
/* Action area */
button = gtk_button_new_with_label ("OK");
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_signal_connect (GTK_OBJECT (button), "clicked",
(GtkSignalFunc) cubism_ok_callback,
dlg);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->action_area), button, TRUE, TRUE, 0);
gtk_widget_grab_default (button);
gtk_widget_show (button);
button = gtk_button_new_with_label ("Cancel");
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
(GtkSignalFunc) gtk_widget_destroy,
GTK_OBJECT (dlg));
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->action_area), button, TRUE, TRUE, 0);
gtk_widget_show (button);
/* parameter settings */
frame = gtk_frame_new ("Parameter Settings");
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_container_border_width (GTK_CONTAINER (frame), 10);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
table = gtk_table_new (3, 2, FALSE);
gtk_container_border_width (GTK_CONTAINER (table), 10);
gtk_container_add (GTK_CONTAINER (frame), table);
toggle = gtk_check_button_new_with_label ("Use Background Color");
gtk_table_attach (GTK_TABLE (table), toggle, 0, 2, 0, 1, GTK_FILL, 0, 0, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) cubism_toggle_update,
&cvals.bg_color);
gtk_toggle_button_set_state (GTK_TOGGLE_BUTTON (toggle), (cvals.bg_color == BG));
gtk_widget_show (toggle);
label = gtk_label_new ("Tile Size");
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2, GTK_FILL, 0, 5, 0);
scale_data = gtk_adjustment_new (cvals.tile_size, 0.0, 100.0, 1.0, 1.0, 0.0);
scale = gtk_hscale_new (GTK_ADJUSTMENT (scale_data));
gtk_widget_set_usize (scale, SCALE_WIDTH, 0);
gtk_table_attach (GTK_TABLE (table), scale, 1, 2, 1, 2, GTK_FILL, 0, 0, 0);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_scale_set_digits (GTK_SCALE (scale), 1);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
(GtkSignalFunc) cubism_scale_update,
&cvals.tile_size);
gtk_widget_show (label);
gtk_widget_show (scale);
label = gtk_label_new ("Tile Saturation");
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 2, 3, GTK_FILL, 0, 5, 0);
scale_data = gtk_adjustment_new (cvals.tile_saturation, 0.0, 10.0, 0.1, 0.1, 0.0);
scale = gtk_hscale_new (GTK_ADJUSTMENT (scale_data));
gtk_widget_set_usize (scale, SCALE_WIDTH, 0);
gtk_table_attach (GTK_TABLE (table), scale, 1, 2, 2, 3, GTK_FILL, 0, 0, 0);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_scale_set_digits (GTK_SCALE (scale), 1);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
(GtkSignalFunc) cubism_scale_update,
&cvals.tile_saturation);
gtk_widget_show (label);
gtk_widget_show (scale);
gtk_widget_show (frame);
gtk_widget_show (table);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return cint.run;
}
static void
render_cubism (GDrawable *drawable)
{
GPixelRgn src_rgn;
gdouble img_area, tile_area;
gdouble x, y;
gdouble width, height;
gdouble theta;
gint ix, iy;
gint rows, cols;
gint i, j, count;
gint num_tiles;
gint x1, y1, x2, y2;
Polygon poly;
guchar col[4];
guchar *dest;
gint bytes;
gint has_alpha;
gint *random_indices;
gpointer pr;
has_alpha = gimp_drawable_has_alpha (drawable->id);
bytes = drawable->bpp;
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
img_area = (x2 - x1) * (y2 - y1);
tile_area = SQR (cvals.tile_size);
cols = ((x2 - x1) + cvals.tile_size - 1) / cvals.tile_size;
rows = ((y2 - y1) + cvals.tile_size - 1) / cvals.tile_size;
/* Fill the image with the background color */
gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
for (pr = gimp_pixel_rgns_register (1, &src_rgn); pr != NULL; pr = gimp_pixel_rgns_process (pr))
{
count = src_rgn.w * src_rgn.h;
dest = src_rgn.data;
while (count--)
for (i = 0; i < bytes; i++)
*dest++ = bg_col[i];
}
num_tiles = (rows + 1) * (cols + 1);
random_indices = (gint *) malloc (sizeof (gint) * num_tiles);
for (i = 0; i < num_tiles; i++)
random_indices[i] = i;
randomize_indices (num_tiles, random_indices);
count = 0;
gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
while (count < num_tiles)
{
i = random_indices[count] / (cols + 1);
j = random_indices[count] % (cols + 1);
x = j * cvals.tile_size + (cvals.tile_size / 4.0) - fp_rand (cvals.tile_size/2.0) + x1;
y = i * cvals.tile_size + (cvals.tile_size / 4.0) - fp_rand (cvals.tile_size/2.0) + y1;
width = (cvals.tile_size + fp_rand (cvals.tile_size / 4.0) - cvals.tile_size / 8.0) *
cvals.tile_saturation;
height = (cvals.tile_size + fp_rand (cvals.tile_size / 4.0) - cvals.tile_size / 8.0) *
cvals.tile_saturation;
theta = fp_rand (2 * M_PI);
polygon_reset (&poly);
polygon_add_point (&poly, -width / 2.0, -height / 2.0);
polygon_add_point (&poly, width / 2.0, -height / 2.0);
polygon_add_point (&poly, width / 2.0, height / 2.0);
polygon_add_point (&poly, -width / 2.0, height / 2.0);
polygon_rotate (&poly, theta);
polygon_translate (&poly, x, y);
/* bounds check on x, y */
ix = (int) x;
iy = (int) y;
if (ix < x1)
ix = x1;
if (ix >= x2)
ix = x2 - 1;
if (iy < y1)
iy = y1;
if (iy >= y2)
iy = y2 - 1;
gimp_pixel_rgn_get_pixel (&src_rgn, col, ix, iy);
if (! has_alpha || (has_alpha && col[bytes - 1] != 0))
fill_poly_color (&poly, drawable, col);
count++;
if ((count % 5) == 0)
gimp_progress_update ((double) count / (double) num_tiles);
}
gimp_progress_update (1.0);
free (random_indices);
}
static void
fill_poly_color (Polygon *poly,
GDrawable *drawable,
guchar *col)
{
GPixelRgn src_rgn;
gdouble dmin_x, dmin_y;
gdouble dmax_x, dmax_y;
gint xs, ys;
gint xe, ye;
gint min_x, min_y;
gint max_x, max_y;
gint size_x, size_y;
gint * max_scanlines;
gint * min_scanlines;
gint * vals;
gint val;
gint alpha;
gint bytes;
guchar buf[4];
gint b, i, j, k, x, y;
gdouble sx, sy;
gdouble ex, ey;
gdouble xx, yy;
gdouble vec[2];
gdouble dist;
gint supersample;
gint supersample2;
gint x1, y1, x2, y2;
sx = poly->pts[0].x;
sy = poly->pts[0].y;
ex = poly->pts[1].x;
ey = poly->pts[1].y;
dist = sqrt (SQR (ex - sx) + SQR (ey - sy));
if (dist > 0.0)
{
vec[0] = (ex - sx) / dist;
vec[1] = (ey - sy) / dist;
}
supersample = SUPERSAMPLE;
supersample2 = SQR (supersample);
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
bytes = drawable->bpp;
polygon_extents (poly, &dmin_x, &dmin_y, &dmax_x, &dmax_y);
min_x = (gint) dmin_x;
min_y = (gint) dmin_y;
max_x = (gint) dmax_x;
max_y = (gint) dmax_y;
size_y = (max_y - min_y) * supersample;
size_x = (max_x - min_x) * supersample;
min_scanlines = (gint *) malloc (sizeof (gint) * size_y);
max_scanlines = (gint *) malloc (sizeof (gint) * size_y);
for (i = 0; i < size_y; i++)
{
min_scanlines[i] = max_x * supersample;
max_scanlines[i] = min_x * supersample;
}
for (i = 0; i < poly->npts; i++)
{
xs = (gint) ((i) ? poly->pts[i-1].x : poly->pts[poly->npts-1].x);
ys = (gint) ((i) ? poly->pts[i-1].y : poly->pts[poly->npts-1].y);
xe = (gint) poly->pts[i].x;
ye = (gint) poly->pts[i].y;
xs *= supersample;
ys *= supersample;
xe *= supersample;
ye *= supersample;
convert_segment (xs, ys, xe, ye, min_y * supersample,
min_scanlines, max_scanlines);
}
gimp_pixel_rgn_init (&src_rgn, drawable, 0, 0,
drawable->width, drawable->height,
TRUE, TRUE);
vals = (gint *) malloc (sizeof (gint) * size_x);
for (i = 0; i < size_y; i++)
{
if (! (i % supersample))
memset (vals, 0, sizeof (gint) * size_x);
yy = (gdouble) i / (gdouble) supersample + min_y;
for (j = min_scanlines[i]; j < max_scanlines[i]; j++)
{
x = j - min_x * supersample;
vals[x] += 255;
}
if (! ((i + 1) % supersample))
{
y = (i / supersample) + min_y;
if (y >= y1 && y < y2)
{
for (j = 0; j < size_x; j += supersample)
{
x = (j / supersample) + min_x;
if (x >= x1 && x < x2)
{
val = 0;
for (k = 0; k < supersample; k++)
val += vals[j + k];
val /= supersample2;
if (val > 0)
{
xx = (gdouble) j / (gdouble) supersample + min_x;
alpha = (gint) (val * calc_alpha_blend (vec, dist, xx - sx, yy - sy));
gimp_pixel_rgn_get_pixel (&src_rgn, buf, x, y);
for (b = 0; b < bytes; b++)
buf[b] = ((col[b] * alpha) + (buf[b] * (255 - alpha))) / 255;
gimp_pixel_rgn_set_pixel (&src_rgn, buf, x, y);
}
}
}
}
}
}
free (vals);
free (min_scanlines);
free (max_scanlines);
}
static void
convert_segment (gint x1,
gint y1,
gint x2,
gint y2,
gint offset,
gint *min,
gint *max)
{
gint ydiff, y, tmp;
gdouble xinc, xstart;
if (y1 > y2)
{ tmp = y2; y2 = y1; y1 = tmp;
tmp = x2; x2 = x1; x1 = tmp; }
ydiff = (y2 - y1);
if ( ydiff )
{
xinc = (gdouble) (x2 - x1) / (gdouble) ydiff;
xstart = x1 + 0.5 * xinc;
for (y = y1 ; y < y2; y++)
{
if (xstart < min[y - offset])
min[y-offset] = xstart;
if (xstart > max[y - offset])
max[y-offset] = xstart;
xstart += xinc;
}
}
}
static gdouble
calc_alpha_blend (gdouble *vec,
gdouble dist,
gdouble x,
gdouble y)
{
gdouble r;
if (!dist)
return 1.0;
else
{
r = (vec[1] * y + vec[0] * x) / dist;
if (r < 0.2)
r = 0.2;
else if (r > 1.0)
r = 1.0;
}
return r;
}
static void
randomize_indices (gint count,
gint *indices)
{
gint i;
gint index1, index2;
gint tmp;
for (i = 0; i < count * RANDOMNESS; i++)
{
index1 = int_rand (count);
index2 = int_rand (count);
tmp = indices[index1];
indices[index1] = indices[index2];
indices[index2] = tmp;
}
}
static gdouble
fp_rand (gdouble val)
{
gdouble rand_val;
rand_val = (gdouble) rand () / (gdouble) (RAND_MAX - 1);
return rand_val * val;
}
static gint
int_rand (gint val)
{
gint rand_val;
rand_val = rand () % val;
return rand_val;
}
static void
polygon_add_point (Polygon *poly,
gdouble x,
gdouble y)
{
if (poly->npts < 12)
{
poly->pts[poly->npts].x = x;
poly->pts[poly->npts].y = y;
poly->npts++;
}
else
g_print ("Unable to add additional point.\n");
}
static void
polygon_rotate (Polygon *poly,
gdouble theta)
{
gint i;
gdouble ct, st;
gdouble ox, oy;
ct = cos (theta);
st = sin (theta);
for (i = 0; i < poly->npts; i++)
{
ox = poly->pts[i].x;
oy = poly->pts[i].y;
poly->pts[i].x = ct * ox - st * oy;
poly->pts[i].y = st * ox + ct * oy;
}
}
static void
polygon_translate (Polygon *poly,
gdouble tx,
gdouble ty)
{
gint i;
for (i = 0; i < poly->npts; i++)
{
poly->pts[i].x += tx;
poly->pts[i].y += ty;
}
}
static gint
polygon_extents (Polygon *poly,
gdouble *x1,
gdouble *y1,
gdouble *x2,
gdouble *y2)
{
gint i;
if (!poly->npts)
return 0;
*x1 = *x2 = poly->pts[0].x;
*y1 = *y2 = poly->pts[0].y;
for (i = 1; i < poly->npts; i++)
{
if (poly->pts[i].x < *x1)
*x1 = poly->pts[i].x;
if (poly->pts[i].x > *x2)
*x2 = poly->pts[i].x;
if (poly->pts[i].y < *y1)
*y1 = poly->pts[i].y;
if (poly->pts[i].y > *y2)
*y2 = poly->pts[i].y;
}
return 1;
}
static void
polygon_reset (Polygon *poly)
{
poly->npts = 0;
}
/* Cubism interface functions */
static void
cubism_close_callback (GtkWidget *widget,
gpointer data)
{
gtk_main_quit ();
}
static void
cubism_ok_callback (GtkWidget *widget,
gpointer data)
{
cint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static void
cubism_toggle_update (GtkWidget *widget,
gpointer data)
{
int *toggle_val;
toggle_val = (int *) data;
if (GTK_TOGGLE_BUTTON (widget)->active)
*toggle_val = TRUE;
else
*toggle_val = FALSE;
}
static void
cubism_scale_update (GtkAdjustment *adjustment,
double *scale_val)
{
*scale_val = adjustment->value;
}
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