/* LIC 0.14 -- image filter plug-in for PIKA
* Copyright (C) 1996 Tom Bech
*
* E-mail: tomb@gimp.org
* You can contact the original PIKA authors at pika@xcf.berkeley.edu
*
* 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 .
*
* In other words, you can't sue me for whatever happens while using this ;)
*
* Changes (post 0.10):
* -> 0.11: Fixed a bug in the convolution kernels (Tom).
* -> 0.12: Added Quartic's bilinear interpolation stuff (Tom).
* -> 0.13 Changed some UI stuff causing trouble with the 0.60 release, added
* the (PIKA) tags and changed random() calls to rand() (Tom)
* -> 0.14 Ported to 0.99.11 (Tom)
*
* This plug-in implements the Line Integral Convolution (LIC) as described in
* Cabral et al. "Imaging vector fields using line integral convolution" in the
* Proceedings of ACM SIGGRAPH 93. Publ. by ACM, New York, NY, USA. p. 263-270.
* (See http://www8.cs.umu.se/kurser/TDBD13/VT00/extra/p263-cabral.pdf)
*
* Some of the code is based on code by Steinar Haugen (thanks!), the Perlin
* noise function is practically ripped as is :)
*/
#include "config.h"
#include
#include
#include "libpika/stdplugins-intl.h"
/************/
/* Typedefs */
/************/
#define numx 40 /* Pseudo-random vector grid size */
#define numy 40
#define PLUG_IN_PROC "plug-in-lic"
#define PLUG_IN_BINARY "van-gogh-lic"
#define PLUG_IN_ROLE "pika-van-gogh-lic"
typedef enum
{
LIC_HUE,
LIC_SATURATION,
LIC_BRIGHTNESS
} LICEffectChannel;
typedef struct _Lic Lic;
typedef struct _LicClass LicClass;
struct _Lic
{
PikaPlugIn parent_instance;
};
struct _LicClass
{
PikaPlugInClass parent_class;
};
#define LIC_TYPE (lic_get_type ())
#define LIC(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), LIC_TYPE, Lic))
GType lic_get_type (void) G_GNUC_CONST;
static GList * lic_query_procedures (PikaPlugIn *plug_in);
static PikaProcedure * lic_create_procedure (PikaPlugIn *plug_in,
const gchar *name);
static PikaValueArray * lic_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
PikaProcedureConfig *config,
gpointer run_data);
static gboolean create_main_dialog (PikaProcedure *procedure,
PikaProcedureConfig *config);
static void compute_image (PikaProcedureConfig *config,
PikaDrawable *drawable);
G_DEFINE_TYPE (Lic, lic, PIKA_TYPE_PLUG_IN)
PIKA_MAIN (LIC_TYPE)
DEFINE_STD_SET_I18N
static void
lic_class_init (LicClass *klass)
{
PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = lic_query_procedures;
plug_in_class->create_procedure = lic_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
lic_init (Lic *lic)
{
}
static GList *
lic_query_procedures (PikaPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static PikaProcedure *
lic_create_procedure (PikaPlugIn *plug_in,
const gchar *name)
{
PikaProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = pika_image_procedure_new (plug_in, name,
PIKA_PDB_PROC_TYPE_PLUGIN,
lic_run, NULL, NULL);
pika_procedure_set_image_types (procedure, "RGB*");
pika_procedure_set_sensitivity_mask (procedure,
PIKA_PROCEDURE_SENSITIVE_DRAWABLE);
pika_procedure_set_menu_label (procedure, _("_Van Gogh (LIC)..."));
pika_procedure_add_menu_path (procedure, "/Filters/Artistic");
pika_procedure_set_documentation (procedure,
_("Special effects that nobody "
"understands"),
"No help yet",
name);
pika_procedure_set_attribution (procedure,
"Tom Bech & Federico Mena Quintero",
"Tom Bech & Federico Mena Quintero",
"Version 0.14, September 24 1997");
PIKA_PROC_ARG_CHOICE (procedure, "effect-channel",
_("E_ffect Channel"),
_("Effect Channel"),
pika_choice_new_with_values ("hue", LIC_HUE, _("Hue"), NULL,
"saturation", LIC_SATURATION, _("Saturation"), NULL,
"brightness", LIC_BRIGHTNESS, _("Brightness"), NULL,
NULL),
"brightness",
G_PARAM_READWRITE);
PIKA_PROC_ARG_CHOICE (procedure, "effect-operator",
_("Effect O_perator"),
_("Effect Operator"),
pika_choice_new_with_values ("derivative", 0, _("Derivative"), NULL,
"gradient", 1, _("Gradient"), NULL,
NULL),
"gradient",
G_PARAM_READWRITE);
PIKA_PROC_ARG_CHOICE (procedure, "effect-convolve",
_("Con_volve"),
_("Convolve"),
pika_choice_new_with_values ("with-white-noise", 0, _("With white noise"), NULL,
"with-source-image", 1, _("With source image"), NULL,
NULL),
"with-source-image",
G_PARAM_READWRITE);
PIKA_PROC_ARG_DRAWABLE (procedure, "effect-image",
_("Effect i_mage"),
_("Effect image"),
TRUE,
G_PARAM_READWRITE);
PIKA_PROC_ARG_DOUBLE (procedure, "filter-length",
_("Fil_ter length"),
_("Filter length"),
0.1, 64.0, 5.0,
G_PARAM_READWRITE);
PIKA_PROC_ARG_DOUBLE (procedure, "noise-magnitude",
_("_Noise Magnitude"),
_("Noise Magnitude"),
1.0, 5.0, 2.0,
G_PARAM_READWRITE);
PIKA_PROC_ARG_DOUBLE (procedure, "integration-steps",
_("Inte_gration steps"),
_("Integration steps"),
1.0, 40.0, 25.0,
G_PARAM_READWRITE);
PIKA_PROC_ARG_DOUBLE (procedure, "min-value",
_("Minimum v_alue"),
_("Minimum value"),
-100.0, 0, -25.0,
G_PARAM_READWRITE);
PIKA_PROC_ARG_DOUBLE (procedure, "max-value",
_("Ma_ximum value"),
_("Maximum value"),
0.0, 100, 25.0,
G_PARAM_READWRITE);
}
return procedure;
}
static PikaValueArray *
lic_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
PikaProcedureConfig *config,
gpointer run_data)
{
PikaDrawable *drawable;
gegl_init (NULL, NULL);
if (n_drawables != 1)
{
GError *error = NULL;
g_set_error (&error, PIKA_PLUG_IN_ERROR, 0,
_("Procedure '%s' only works with one drawable."),
PLUG_IN_PROC);
return pika_procedure_new_return_values (procedure,
PIKA_PDB_CALLING_ERROR,
error);
}
else
{
drawable = drawables[0];
}
/* Make sure that the drawable is RGBA or RGB color */
/* ================================================ */
if (pika_drawable_is_rgb (drawable))
{
switch (run_mode)
{
case PIKA_RUN_INTERACTIVE:
if (! create_main_dialog (procedure, config))
{
return pika_procedure_new_return_values (procedure,
PIKA_PDB_CANCEL,
NULL);
}
/* fallthrough */
case PIKA_RUN_WITH_LAST_VALS:
compute_image (config, drawable);
break;
default:
break;
}
}
else
{
return pika_procedure_new_return_values (procedure,
PIKA_PDB_EXECUTION_ERROR,
NULL);
}
return pika_procedure_new_return_values (procedure, PIKA_PDB_SUCCESS, NULL);
}
/*****************************/
/* Global variables and such */
/*****************************/
static gdouble G[numx][numy][2];
static gdouble l = 10.0;
static gdouble dx = 2.0;
static gdouble dy = 2.0;
static gdouble minv = -2.5;
static gdouble maxv = 2.5;
static gdouble isteps = 20.0;
static gboolean source_drw_has_alpha = FALSE;
static gint effect_width, effect_height;
static gint border_x, border_y, border_w, border_h;
/************************/
/* Convenience routines */
/************************/
static void
peek (GeglBuffer *buffer,
gint x,
gint y,
PikaRGB *color)
{
gegl_buffer_sample (buffer, x, y, NULL,
color, babl_format ("R'G'B'A double"),
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
}
static void
poke (GeglBuffer *buffer,
gint x,
gint y,
PikaRGB *color)
{
gegl_buffer_set (buffer, GEGL_RECTANGLE (x, y, 1, 1), 0,
babl_format ("R'G'B'A double"), color,
GEGL_AUTO_ROWSTRIDE);
}
static gint
peekmap (const guchar *image,
gint x,
gint y)
{
while (x < 0)
x += effect_width;
x %= effect_width;
while (y < 0)
y += effect_height;
y %= effect_height;
return (gint) image[x + effect_width * y];
}
/*************/
/* Main part */
/*************/
/***************************************************/
/* Compute the derivative in the x and y direction */
/* We use these convolution kernels: */
/* |1 0 -1| | 1 2 1| */
/* DX: |2 0 -2| DY: | 0 0 0| */
/* |1 0 -1| | -1 -2 -1| */
/* (It's a variation of the Sobel kernels, really) */
/***************************************************/
static gint
gradx (const guchar *image,
gint x,
gint y)
{
gint val = 0;
val = val + peekmap (image, x-1, y-1);
val = val - peekmap (image, x+1, y-1);
val = val + 2 * peekmap (image, x-1, y);
val = val - 2 * peekmap (image, x+1, y);
val = val + peekmap (image, x-1, y+1);
val = val - peekmap (image, x+1, y+1);
return val;
}
static gint
grady (const guchar *image,
gint x,
gint y)
{
gint val = 0;
val = val + peekmap (image, x-1, y-1);
val = val + 2 * peekmap (image, x, y-1);
val = val + peekmap (image, x+1, y-1);
val = val - peekmap (image, x-1, y+1);
val = val - 2 * peekmap (image, x, y+1);
val = val - peekmap (image, x+1, y+1);
return val;
}
/************************************/
/* A nice 2nd order cubic spline :) */
/************************************/
static gdouble
cubic (gdouble t)
{
gdouble at = fabs (t);
return (at < 1.0) ? at * at * (2.0 * at - 3.0) + 1.0 : 0.0;
}
static gdouble
omega (gdouble u,
gdouble v,
gint i,
gint j)
{
while (i < 0)
i += numx;
while (j < 0)
j += numy;
i %= numx;
j %= numy;
return cubic (u) * cubic (v) * (G[i][j][0]*u + G[i][j][1]*v);
}
/*************************************************************/
/* The noise function (2D variant of Perlins noise function) */
/*************************************************************/
static gdouble
noise (gdouble x,
gdouble y)
{
gint i, sti = (gint) floor (x / dx);
gint j, stj = (gint) floor (y / dy);
gdouble sum = 0.0;
/* Calculate the gdouble sum */
/* ======================== */
for (i = sti; i <= sti + 1; i++)
for (j = stj; j <= stj + 1; j++)
sum += omega ((x - (gdouble) i * dx) / dx,
(y - (gdouble) j * dy) / dy,
i, j);
return sum;
}
/*************************************************/
/* Generates pseudo-random vectors with length 1 */
/*************************************************/
static void
generatevectors (void)
{
gdouble alpha;
gint i, j;
GRand *gr;
gr = g_rand_new();
for (i = 0; i < numx; i++)
{
for (j = 0; j < numy; j++)
{
alpha = g_rand_double_range (gr, 0, 2) * G_PI;
G[i][j][0] = cos (alpha);
G[i][j][1] = sin (alpha);
}
}
g_rand_free (gr);
}
/* A simple triangle filter */
/* ======================== */
static gdouble
filter (gdouble u)
{
gdouble f = 1.0 - fabs (u) / l;
return (f < 0.0) ? 0.0 : f;
}
/******************************************************/
/* Compute the Line Integral Convolution (LIC) at x,y */
/******************************************************/
static gdouble
lic_noise (gint x,
gint y,
gdouble vx,
gdouble vy)
{
gdouble i = 0.0;
gdouble f1 = 0.0, f2 = 0.0;
gdouble u, step = 2.0 * l / isteps;
gdouble xx = (gdouble) x, yy = (gdouble) y;
gdouble c, s;
/* Get vector at x,y */
/* ================= */
c = vx;
s = vy;
/* Calculate integral numerically */
/* ============================== */
f1 = filter (-l) * noise (xx + l * c , yy + l * s);
for (u = -l + step; u <= l; u += step)
{
f2 = filter (u) * noise ( xx - u * c , yy - u * s);
i += (f1 + f2) * 0.5 * step;
f1 = f2;
}
i = (i - minv) / (maxv - minv);
i = CLAMP (i, 0.0, 1.0);
i = (i / 2.0) + 0.5;
return i;
}
static void
getpixel (GeglBuffer *buffer,
PikaRGB *p,
gdouble u,
gdouble v)
{
register gint x1, y1, x2, y2;
gint width, height;
static PikaRGB pp[4];
width = border_w;
height = border_h;
x1 = (gint)u;
y1 = (gint)v;
if (x1 < 0)
x1 = width - (-x1 % width);
else
x1 = x1 % width;
if (y1 < 0)
y1 = height - (-y1 % height);
else
y1 = y1 % height;
x2 = (x1 + 1) % width;
y2 = (y1 + 1) % height;
peek (buffer, x1, y1, &pp[0]);
peek (buffer, x2, y1, &pp[1]);
peek (buffer, x1, y2, &pp[2]);
peek (buffer, x2, y2, &pp[3]);
if (source_drw_has_alpha)
*p = pika_bilinear_rgba (u, v, pp);
else
*p = pika_bilinear_rgb (u, v, pp);
}
static void
lic_image (GeglBuffer *buffer,
gint x,
gint y,
gdouble vx,
gdouble vy,
PikaRGB *color)
{
gdouble u, step = 2.0 * l / isteps;
gdouble xx = (gdouble) x, yy = (gdouble) y;
gdouble c, s;
PikaRGB col = { 0, 0, 0, 0 };
PikaRGB col1, col2, col3;
/* Get vector at x,y */
/* ================= */
c = vx;
s = vy;
/* Calculate integral numerically */
/* ============================== */
getpixel (buffer, &col1, xx + l * c, yy + l * s);
if (source_drw_has_alpha)
pika_rgba_multiply (&col1, filter (-l));
else
pika_rgb_multiply (&col1, filter (-l));
for (u = -l + step; u <= l; u += step)
{
getpixel (buffer, &col2, xx - u * c, yy - u * s);
if (source_drw_has_alpha)
{
pika_rgba_multiply (&col2, filter (u));
col3 = col1;
pika_rgba_add (&col3, &col2);
pika_rgba_multiply (&col3, 0.5 * step);
pika_rgba_add (&col, &col3);
}
else
{
pika_rgb_multiply (&col2, filter (u));
col3 = col1;
pika_rgb_add (&col3, &col2);
pika_rgb_multiply (&col3, 0.5 * step);
pika_rgb_add (&col, &col3);
}
col1 = col2;
}
if (source_drw_has_alpha)
pika_rgba_multiply (&col, 1.0 / l);
else
pika_rgb_multiply (&col, 1.0 / l);
pika_rgb_clamp (&col);
*color = col;
}
static guchar *
rgb_to_hsl (PikaDrawable *drawable,
LICEffectChannel effect_channel)
{
GeglBuffer *buffer;
guchar *themap, data[4];
gint x, y;
PikaRGB color;
PikaHSL color_hsl;
gdouble val = 0.0;
glong maxc, index = 0;
GRand *gr;
gr = g_rand_new ();
maxc = pika_drawable_get_width (drawable) * pika_drawable_get_height (drawable);
buffer = pika_drawable_get_buffer (drawable);
themap = g_new (guchar, maxc);
for (y = 0; y < border_h; y++)
{
for (x = 0; x < border_w; x++)
{
data[3] = 255;
gegl_buffer_sample (buffer, x, y, NULL,
data, babl_format ("R'G'B'A u8"),
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
pika_rgba_set_uchar (&color, data[0], data[1], data[2], data[3]);
pika_rgb_to_hsl (&color, &color_hsl);
switch (effect_channel)
{
case LIC_HUE:
val = color_hsl.h * 255;
break;
case LIC_SATURATION:
val = color_hsl.s * 255;
break;
case LIC_BRIGHTNESS:
val = color_hsl.l * 255;
break;
}
/* add some random to avoid unstructured areas. */
val += g_rand_double_range (gr, -1.0, 1.0);
themap[index++] = (guchar) CLAMP0255 (RINT (val));
}
}
g_object_unref (buffer);
g_rand_free (gr);
return themap;
}
static void
compute_lic (PikaProcedureConfig *config,
PikaDrawable *drawable,
const guchar *scalarfield,
gboolean rotate)
{
GeglBuffer *src_buffer;
GeglBuffer *dest_buffer;
gint xcount, ycount;
PikaRGB color;
gdouble vx, vy, tmp;
gint effect_convolve;
effect_convolve = pika_procedure_config_get_choice_id (config,
"effect-convolve");
src_buffer = pika_drawable_get_buffer (drawable);
dest_buffer = pika_drawable_get_shadow_buffer (drawable);
for (ycount = 0; ycount < border_h; ycount++)
{
for (xcount = 0; xcount < border_w; xcount++)
{
/* Get derivative at (x,y) and normalize it */
/* ============================================================== */
vx = gradx (scalarfield, xcount, ycount);
vy = grady (scalarfield, xcount, ycount);
/* Rotate if needed */
if (rotate)
{
tmp = vy;
vy = -vx;
vx = tmp;
}
tmp = sqrt (vx * vx + vy * vy);
if (tmp >= 0.000001)
{
tmp = 1.0 / tmp;
vx *= tmp;
vy *= tmp;
}
/* Convolve with the LIC at (x,y) */
/* ============================== */
if (effect_convolve == 0)
{
peek (src_buffer, xcount, ycount, &color);
tmp = lic_noise (xcount, ycount, vx, vy);
if (source_drw_has_alpha)
pika_rgba_multiply (&color, tmp);
else
pika_rgb_multiply (&color, tmp);
}
else
{
lic_image (src_buffer, xcount, ycount, vx, vy, &color);
}
poke (dest_buffer, xcount, ycount, &color);
}
pika_progress_update ((gfloat) ycount / (gfloat) border_h);
}
g_object_unref (src_buffer);
g_object_unref (dest_buffer);
pika_progress_update (1.0);
}
static void
compute_image (PikaProcedureConfig *config,
PikaDrawable *drawable)
{
PikaDrawable *effect_image;
guchar *scalarfield = NULL;
gdouble filtlen;
gdouble noisemag;
gdouble intsteps;
gdouble minv;
gdouble maxv;
gint effect_channel;
gint effect_operator;
gint effect_convolve;
g_object_get (config,
"filter-length", &filtlen,
"noise-magnitude", &noisemag,
"effect-image", &effect_image,
"integration-steps", &intsteps,
"min-value", &minv,
"max-value", &maxv,
NULL);
effect_channel = pika_procedure_config_get_choice_id (config,
"effect-channel");
effect_operator = pika_procedure_config_get_choice_id (config,
"effect-operator");
effect_convolve = pika_procedure_config_get_choice_id (config,
"effect-convolve");
if (! effect_image)
return;
/* Get some useful info on the input drawable */
/* ========================================== */
if (! pika_drawable_mask_intersect (drawable,
&border_x, &border_y,
&border_w, &border_h))
return;
pika_progress_init (_("Van Gogh (LIC)"));
if (effect_convolve == 0)
generatevectors ();
if (filtlen < 0.1)
filtlen = 0.1;
l = filtlen;
dx = dy = noisemag;
minv = minv / 10.0;
maxv = maxv / 10.0;
isteps = intsteps;
source_drw_has_alpha = pika_drawable_has_alpha (drawable);
effect_width = pika_drawable_get_width (effect_image);
effect_height = pika_drawable_get_height (effect_image);
switch (effect_channel)
{
case LIC_HUE:
scalarfield = rgb_to_hsl (effect_image, LIC_HUE);
break;
case LIC_SATURATION:
scalarfield = rgb_to_hsl (effect_image, LIC_SATURATION);
break;
case LIC_BRIGHTNESS:
scalarfield = rgb_to_hsl (effect_image, LIC_BRIGHTNESS);
break;
}
g_clear_object (&effect_image);
compute_lic (config, drawable, scalarfield, effect_operator);
g_free (scalarfield);
/* Update image */
/* ============ */
pika_drawable_merge_shadow (drawable, TRUE);
pika_drawable_update (drawable, border_x, border_y, border_w, border_h);
pika_displays_flush ();
}
/**************************/
/* Below is only UI stuff */
/**************************/
static gboolean
create_main_dialog (PikaProcedure *procedure,
PikaProcedureConfig *config)
{
GtkWidget *dialog;
gboolean run;
pika_ui_init (PLUG_IN_BINARY);
dialog = pika_procedure_dialog_new (procedure,
PIKA_PROCEDURE_CONFIG (config),
_("Van Gogh (LIC)"));
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"filter-length", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"noise-magnitude", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"integration-steps", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"min-value", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"max-value", 1.0);
pika_procedure_dialog_fill (PIKA_PROCEDURE_DIALOG (dialog), NULL);
gtk_widget_show (dialog);
run = pika_procedure_dialog_run (PIKA_PROCEDURE_DIALOG (dialog));
gtk_widget_destroy (dialog);
return run;
}