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gimp/plug-ins/common/nova.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* SuperNova plug-in
* Copyright (C) 1997 Eiichi Takamori <taka@ma1.seikyou.ne.jp>,
* Spencer Kimball, Federico Mena Quintero
*
* 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.
*/
/*
* version 1.122
* This plug-in requires GIMP v0.99.10 or above.
*
* This plug-in produces an effect like a supernova burst.
*
* Eiichi Takamori <taka@ma1.seikyou.ne.jp>
* http://ha1.seikyou.ne.jp/home/taka/gimp/
*
*
* Changes from version 1.1115 to version 1.122 by Martin Weber:
* - Little bug fixes
* - Added random hue
* - Freeing memory
*
* Changes from version 1.1114 to version 1.1115:
* - Added gtk_rc_parse
* - Fixed bug that drawing preview of small height image
* (maybe image height < PREVIEW_SIZE) caused core dump.
* - Changed default value.
* - Moved to <Image>/Filters/Effects. right?
* - etc...
*
* Changes from version 1.1112 to version 1.1114:
* - Modified proc args to PARAM_COLOR, also included nspoke.
* - nova_int_entryscale_new(): Fixed caption was guchar -> gchar, etc.
* - Now nova renders properly with alpha channel.
* (Very thanks to Spencer Kimball and Federico Mena !)
*
* TODO:
* - clean up the code more
* - fix preview
* - add notebook interface and so on
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include "gtk/gtk.h"
#include "libgimp/gimp.h"
#include "libgimp/gimpui.h"
#include "libgimp/stdplugins-intl.h"
#ifdef RCSID
static char rcsid[] = "$Id$";
#endif
/* Some useful macros */
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif /* M_PI */
#ifndef RAND_MAX
#define RAND_MAX 2147483647
#endif /* RAND_MAX */
#if 0
#define DEBUG1 printf
#else
#define DEBUG1 dummy_printf
static void dummy_printf( char *fmt, ... ) {}
#endif
#define ENTRY_WIDTH 40
#define SCALE_WIDTH 125
#define PREVIEW_SIZE 100
#define TILE_CACHE_SIZE 16
#define PREVIEW 0x1
#define CURSOR 0x2
#define ALL 0xf
#define PREVIEW_MASK GDK_EXPOSURE_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON1_MOTION_MASK
typedef struct {
gint xcenter, ycenter;
guchar color[3];
gint radius;
gint nspoke;
gint randomhue;
} NovaValues;
typedef struct {
gint run;
} NovaInterface;
typedef struct {
GtkObject *adjustment;
GtkWidget *entry;
gint constraint;
} NovaEntryScaleData;
typedef struct
{
GDrawable *drawable;
gint dwidth, dheight;
gint bpp;
GtkWidget *xentry, *yentry;
GtkWidget *preview;
gint pwidth, pheight;
gint cursor;
gint curx, cury; /* x,y of cursor in preview */
gint oldx, oldy;
gint in_call;
} NovaCenter;
/* Declare a local function.
*/
static void query (void);
static void run (gchar *name,
gint nparams,
GParam *param,
gint *nreturn_vals,
GParam **return_vals);
static gint nova_dialog ( GDrawable *drawable );
static GtkWidget * nova_center_create ( GDrawable *drawable );
static void nova_center_destroy ( GtkWidget *widget,
gpointer data );
static void nova_center_preview_init ( NovaCenter *center );
static void nova_center_draw ( NovaCenter *center, gint update );
static void nova_center_entry_update ( GtkWidget *widget,
gpointer data );
static void nova_center_cursor_update ( NovaCenter *center );
static gint nova_center_preview_expose ( GtkWidget *widget,
GdkEvent *event );
static gint nova_center_preview_events ( GtkWidget *widget,
GdkEvent *event );
static void nova_int_entryscale_new ( GtkTable *table, gint x, gint y,
gchar *caption, gint *intvar,
gint min, gint max, gint constraint);
static void nova_close_callback (GtkWidget *widget,
gpointer data);
static void nova_ok_callback (GtkWidget *widget,
gpointer data);
static void nova_paired_entry_destroy_callback (GtkWidget *widget,
gpointer data);
static void nova_paired_int_scale_update (GtkAdjustment *adjustment,
gpointer data);
static void nova_paired_int_entry_update (GtkWidget *widget,
gpointer data );
static void nova (GDrawable *drawable);
static void rgb_to_hsl (gdouble r,
gdouble g,
gdouble b,
gdouble * h,
gdouble * s,
gdouble * l);
static void hsl_to_rgb (gdouble h,
gdouble sl,
gdouble l,
gdouble * r,
gdouble * g,
gdouble * b);
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static NovaValues pvals =
{
128, 128, /* xcenter, ycenter */
{ 90, 100, 255 }, /* color */
20, /* radius */
100, /* nspoke */
0 /* random hue */
};
static NovaInterface pint =
{
FALSE /* run */
};
MAIN ()
static void
query ()
{
static GParamDef args[]=
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "Input image (unused)" },
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
{ PARAM_INT32, "xcenter", "X coordinates of the center of supernova" },
{ PARAM_INT32, "ycenter", "Y coordinates of the center of supernova" },
{ PARAM_COLOR, "color", "Color of supernova" },
{ PARAM_INT32, "radius", "Radius of supernova" },
{ PARAM_INT32, "nspoke", "Number of spokes" },
{ PARAM_INT32, "randomhue", "Random hue" }
};
static GParamDef *return_vals = NULL;
static gint nargs = sizeof (args) / sizeof (args[0]);
static gint nreturn_vals = 0;
gchar *help_string =
" This plug-in produces an effect like a supernova burst. The"
" amount of the light effect is approximately in proportion to 1/r,"
" where r is the distance from the center of the star. It works with"
" RGB*, GRAY* image.";
gimp_install_procedure ("plug_in_nova",
"Produce Supernova effect to the specified drawable",
help_string,
"Eiichi Takamori",
"Eiichi Takamori",
"1997",
"<Image>/Filters/Light Effects/SuperNova",
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
}
static void
run (gchar *name,
gint nparams,
GParam *param,
gint *nreturn_vals,
GParam **return_vals)
{
static GParam values[1];
GDrawable *drawable;
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS;
INIT_I18N_UI();
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
switch (run_mode)
{
case RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data ("plug_in_nova", &pvals);
/* First acquire information with a dialog */
if (! nova_dialog ( drawable ))
{
gimp_drawable_detach (drawable);
return;
}
break;
case RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 9)
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS)
{
pvals.xcenter = param[3].data.d_int32;
pvals.ycenter = param[4].data.d_int32;
pvals.color[0] = param[5].data.d_color.red;
pvals.color[1] = param[5].data.d_color.green;
pvals.color[2] = param[5].data.d_color.blue;
pvals.radius = param[6].data.d_int32;
pvals.nspoke = param[7].data.d_int32;
pvals.randomhue = param[8].data.d_int32;
}
if ((status == STATUS_SUCCESS) &&
pvals.radius <= 0 )
status = STATUS_CALLING_ERROR;
break;
case RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data ("plug_in_nova", &pvals);
break;
default:
break;
}
if (status == STATUS_SUCCESS)
{
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->id) || gimp_drawable_is_gray (drawable->id))
{
gimp_progress_init (_("Rendering SuperNova..."));
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
nova (drawable);
if (run_mode != RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == RUN_INTERACTIVE)
gimp_set_data ("plug_in_nova", &pvals, sizeof (NovaValues));
}
else
{
/* gimp_message ("nova: cannot operate on indexed color images"); */
status = STATUS_EXECUTION_ERROR;
}
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
/*******************/
/* */
/* Main Dialog */
/* */
/*******************/
static gint
nova_dialog (GDrawable *drawable)
{
GtkWidget *dlg;
GtkWidget *hbbox;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *label;
GtkWidget *align;
GtkWidget *button;
GtkWidget *center_frame;
guchar *color_cube;
gchar **argv;
gint argc;
argc = 1;
argv = g_new (gchar *, 1);
argv[0] = g_strdup ("nova");
gtk_init (&argc, &argv);
gtk_rc_parse (gimp_gtkrc ());
gdk_set_use_xshm (gimp_use_xshm ());
gtk_preview_set_gamma (gimp_gamma ());
gtk_preview_set_install_cmap (gimp_install_cmap ());
color_cube = gimp_color_cube ();
gtk_preview_set_color_cube (color_cube[0], color_cube[1],
color_cube[2], color_cube[3]);
gtk_widget_set_default_visual (gtk_preview_get_visual ());
gtk_widget_set_default_colormap (gtk_preview_get_cmap ());
#if 0
printf("Waiting... (pid %d)\n", getpid());
kill(getpid(), 19); /* SIGSTOP */
#endif
dlg = gtk_dialog_new ();
gtk_window_set_title (GTK_WINDOW (dlg), _("SuperNova"));
gtk_window_position (GTK_WINDOW (dlg), GTK_WIN_POS_MOUSE);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
(GtkSignalFunc) nova_close_callback,
NULL);
/* Action area */
/* Action area */
gtk_container_set_border_width (GTK_CONTAINER (GTK_DIALOG (dlg)->action_area), 2);
gtk_box_set_homogeneous (GTK_BOX (GTK_DIALOG (dlg)->action_area), FALSE);
hbbox = gtk_hbutton_box_new ();
gtk_button_box_set_spacing (GTK_BUTTON_BOX (hbbox), 4);
gtk_box_pack_end (GTK_BOX (GTK_DIALOG (dlg)->action_area), hbbox, FALSE, FALSE, 0);
gtk_widget_show (hbbox);
button = gtk_button_new_with_label (_("OK"));
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_signal_connect (GTK_OBJECT (button), "clicked",
(GtkSignalFunc) nova_ok_callback,
dlg);
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 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 (hbbox), button, FALSE, FALSE, 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 (5, 2, FALSE);
gtk_container_border_width (GTK_CONTAINER (table), 10);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_table_set_row_spacings (GTK_TABLE (table), 3);
gtk_table_set_col_spacings (GTK_TABLE (table), 10);
center_frame = nova_center_create ( drawable );
gtk_table_attach (GTK_TABLE (table), center_frame, 0, 2, 0, 1,
0, 0, 0, 0 );
label = gtk_label_new (_("Color:"));
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
gtk_table_attach_defaults (GTK_TABLE(table), label, 0, 1, 1, 2);
gtk_widget_show (label);
align = gtk_alignment_new (0.0, 0.5, 0.0, 0.0);
button = gimp_color_button_new (_("SuperNova Color Picker"),
SCALE_WIDTH - 8, 16,
pvals.color, 3);
gtk_container_add (GTK_CONTAINER (align), button);
gtk_table_attach_defaults (GTK_TABLE(table), align, 1, 2, 1, 2);
gtk_widget_show (align);
gtk_widget_show (button);
nova_int_entryscale_new( GTK_TABLE (table), 0, 2,
_("Radius:"), &pvals.radius,
1, 100, FALSE );
nova_int_entryscale_new( GTK_TABLE (table), 0, 3,
_("Spokes:"), &pvals.nspoke,
1, 1024, TRUE );
nova_int_entryscale_new( GTK_TABLE (table), 0, 4,
_("Random Hue:"), &pvals.randomhue,
0, 360, TRUE );
gtk_widget_show (frame);
gtk_widget_show (table);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return pint.run;
}
/*** Dialog interface ***/
static void
nova_close_callback (GtkWidget *widget,
gpointer data)
{
gtk_main_quit ();
}
static void
nova_ok_callback (GtkWidget *widget,
gpointer data)
{
pint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
/*=================================================================
CenterFrame
A frame that contains one preview and 2 entrys, used for positioning
of the center of Nova.
==================================================================*/
/*
* Create new CenterFrame, and return it (GtkFrame).
*/
static GtkWidget *
nova_center_create (GDrawable *drawable)
{
NovaCenter *center;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *label;
GtkWidget *entry;
GtkWidget *pframe;
GtkWidget *preview;
gchar buf[256];
center = g_new( NovaCenter, 1 );
center->drawable = drawable;
center->dwidth = gimp_drawable_width(drawable->id );
center->dheight = gimp_drawable_height(drawable->id );
center->bpp = gimp_drawable_bpp(drawable->id);
if ( gimp_drawable_has_alpha(drawable->id) )
center->bpp--;
center->cursor = FALSE;
center->curx = 0;
center->cury = 0;
center->oldx = 0;
center->oldy = 0;
center->in_call = TRUE; /* to avoid side effects while initialization */
frame = gtk_frame_new (_("Center of SuperNova"));
gtk_signal_connect( GTK_OBJECT( frame ), "destroy",
(GtkSignalFunc) nova_center_destroy,
center );
gtk_frame_set_shadow_type( GTK_FRAME( frame ) ,GTK_SHADOW_ETCHED_IN );
gtk_container_border_width( GTK_CONTAINER( frame ), 10 );
table = gtk_table_new ( 2, 4, FALSE );
gtk_container_border_width (GTK_CONTAINER (table), 10);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_table_set_row_spacings (GTK_TABLE (table), 3);
gtk_table_set_col_spacings (GTK_TABLE (table), 5);
label = gtk_label_new (_("X: "));
gtk_misc_set_alignment( GTK_MISC(label), 0.0, 0.5 );
gtk_table_attach( GTK_TABLE(table), label, 0, 1, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show(label);
center->xentry = entry = gtk_entry_new ();
gtk_object_set_user_data( GTK_OBJECT(entry), center );
gtk_signal_connect( GTK_OBJECT(entry), "changed",
(GtkSignalFunc) nova_center_entry_update,
&pvals.xcenter );
gtk_widget_set_usize( GTK_WIDGET(entry), ENTRY_WIDTH,0 );
gtk_table_attach( GTK_TABLE(table), entry, 1, 2, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0 );
gtk_widget_show(entry);
label = gtk_label_new (_("Y: "));
gtk_misc_set_alignment( GTK_MISC(label), 0.0, 0.5 );
gtk_table_attach( GTK_TABLE(table), label, 2, 3, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0 );
gtk_widget_show(label);
center->yentry = entry = gtk_entry_new ();
gtk_object_set_user_data( GTK_OBJECT(entry), center );
gtk_signal_connect( GTK_OBJECT(entry), "changed",
(GtkSignalFunc) nova_center_entry_update,
&pvals.ycenter );
gtk_widget_set_usize( GTK_WIDGET(entry), ENTRY_WIDTH, 0 );
gtk_table_attach( GTK_TABLE(table), entry, 3, 4, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show(entry);
/* frame (shadow_in) that contains preview */
pframe = gtk_frame_new ( NULL );
gtk_frame_set_shadow_type( GTK_FRAME( pframe ), GTK_SHADOW_IN );
gtk_table_attach( GTK_TABLE(table), pframe, 0, 4, 1, 2, 0, 0, 0, 0 );
/* PREVIEW */
center->preview = preview = gtk_preview_new( center->bpp==3 ? GTK_PREVIEW_COLOR : GTK_PREVIEW_GRAYSCALE );
gtk_object_set_user_data( GTK_OBJECT(preview), center );
gtk_widget_set_events( GTK_WIDGET(preview), PREVIEW_MASK );
gtk_signal_connect_after( GTK_OBJECT(preview), "expose_event",
(GtkSignalFunc) nova_center_preview_expose,
center );
gtk_signal_connect( GTK_OBJECT(preview), "event",
(GtkSignalFunc) nova_center_preview_events,
center );
gtk_container_add( GTK_CONTAINER( pframe ), center->preview );
/*
* Resize the greater one of dwidth and dheight to PREVIEW_SIZE
*/
if ( center->dwidth > center->dheight ) {
center->pheight = center->dheight * PREVIEW_SIZE / center->dwidth;
center->pwidth = PREVIEW_SIZE;
} else {
center->pwidth = center->dwidth * PREVIEW_SIZE / center->dheight;
center->pheight = PREVIEW_SIZE;
}
gtk_preview_size( GTK_PREVIEW( preview ), center->pwidth, center->pheight );
/* Draw the contents of preview, that is saved in the preview widget */
nova_center_preview_init( center );
gtk_widget_show(preview);
gtk_widget_show( pframe );
gtk_widget_show( table );
gtk_widget_show( frame );
sprintf( buf, "%d", pvals.xcenter );
gtk_entry_set_text( GTK_ENTRY(center->xentry), buf );
sprintf( buf, "%d", pvals.ycenter );
gtk_entry_set_text( GTK_ENTRY(center->yentry), buf );
nova_center_cursor_update( center );
center->cursor = FALSE; /* Make sure that the cursor has not been drawn */
center->in_call = FALSE; /* End of initialization */
DEBUG1("pvals center=%d,%d\n", pvals.xcenter, pvals.ycenter );
DEBUG1("center cur=%d,%d\n", center->curx, center->cury );
return frame;
}
static void
nova_center_destroy (GtkWidget *widget,
gpointer data)
{
NovaCenter *center = data;
g_free( center );
}
static void render_preview ( GtkWidget *preview, GPixelRgn *srcrgn );
/*
* Initialize preview
* Draw the contents into the internal buffer of the preview widget
*/
static void
nova_center_preview_init (NovaCenter *center)
{
GtkWidget *preview;
GPixelRgn src_rgn;
gint dwidth, dheight, pwidth, pheight, bpp;
preview = center->preview;
dwidth = center->dwidth;
dheight = center->dheight;
pwidth = center->pwidth;
pheight = center->pheight;
bpp = center->bpp;
gimp_pixel_rgn_init ( &src_rgn, center->drawable, 0, 0,
center->dwidth, center->dheight, FALSE, FALSE );
render_preview( center->preview, &src_rgn );
}
/*======================================================================
Preview Rendering Util routine
=======================================================================*/
#define CHECKWIDTH 4
#define LIGHTCHECK 192
#define DARKCHECK 128
#ifndef OPAQUE
#define OPAQUE 255
#endif
static void
render_preview (GtkWidget *preview,
GPixelRgn *srcrgn)
{
guchar *src_row, *dest_row, *src, *dest;
gint row, col;
gint dwidth, dheight, pwidth, pheight;
gint *src_col;
gint bpp, alpha, has_alpha, b;
guchar check;
dwidth = srcrgn->w;
dheight = srcrgn->h;
if( GTK_PREVIEW(preview)->buffer )
{
pwidth = GTK_PREVIEW(preview)->buffer_width;
pheight = GTK_PREVIEW(preview)->buffer_height;
}
else
{
pwidth = preview->requisition.width;
pheight = preview->requisition.height;
}
bpp = srcrgn->bpp;
alpha = bpp;
has_alpha = gimp_drawable_has_alpha( srcrgn->drawable->id );
if( has_alpha ) alpha--;
/* printf("render_preview: %d %d %d", bpp, alpha, has_alpha);
printf(" (%d %d %d %d)\n", dwidth, dheight, pwidth, pheight); */
src_row = g_new ( guchar, dwidth * bpp );
dest_row = g_new ( guchar, pwidth * bpp );
src_col = g_new ( gint, pwidth );
for ( col = 0; col < pwidth; col++ )
src_col[ col ] = ( col * dwidth / pwidth ) * bpp;
for ( row = 0; row < pheight; row++ )
{
gimp_pixel_rgn_get_row ( srcrgn, src_row,
0, row * dheight / pheight, dwidth );
dest = dest_row;
for ( col = 0; col < pwidth; col++ )
{
src = &src_row[ src_col[col] ];
if( !has_alpha || src[alpha] == OPAQUE )
{
/* no alpha channel or opaque -- simple way */
for ( b = 0; b < alpha; b++ )
dest[b] = src[b];
}
else
{
/* more or less transparent */
if( ( col % (CHECKWIDTH*2) < CHECKWIDTH ) ^
( row % (CHECKWIDTH*2) < CHECKWIDTH ) )
check = LIGHTCHECK;
else
check = DARKCHECK;
if ( src[alpha] == 0 )
{
/* full transparent -- check */
for ( b = 0; b < alpha; b++ )
dest[b] = check;
}
else
{
/* middlemost transparent -- mix check and src */
for ( b = 0; b < alpha; b++ )
dest[b] = ( src[b]*src[alpha] + check*(OPAQUE-src[alpha]) ) / OPAQUE;
}
}
dest += alpha;
}
gtk_preview_draw_row( GTK_PREVIEW( preview ), dest_row,
0, row, pwidth );
}
g_free ( src_col );
g_free ( src_row );
g_free ( dest_row );
}
/*======================================================================
Preview Rendering Util routine End
=======================================================================*/
/*
* Drawing CenterFrame
* if update & PREVIEW, draw preview
* if update & CURSOR, draw cross cursor
*/
static void
nova_center_draw (NovaCenter *center,
gint update)
{
if( update & PREVIEW )
{
center->cursor = FALSE;
DEBUG1("draw-preview\n");
}
if( update & CURSOR )
{
DEBUG1("draw-cursor %d old=%d,%d cur=%d,%d\n",
center->cursor, center->oldx, center->oldy, center->curx, center->cury);
gdk_gc_set_function ( center->preview->style->black_gc, GDK_INVERT);
if( center->cursor )
{
gdk_draw_line ( center->preview->window,
center->preview->style->black_gc,
center->oldx, 1, center->oldx, center->pheight-1 );
gdk_draw_line ( center->preview->window,
center->preview->style->black_gc,
1, center->oldy, center->pwidth-1, center->oldy );
}
gdk_draw_line ( center->preview->window,
center->preview->style->black_gc,
center->curx, 1, center->curx, center->pheight-1 );
gdk_draw_line ( center->preview->window,
center->preview->style->black_gc,
1, center->cury, center->pwidth-1, center->cury );
/* current position of cursor is updated */
center->oldx = center->curx;
center->oldy = center->cury;
center->cursor = TRUE;
gdk_gc_set_function ( center->preview->style->black_gc, GDK_COPY);
}
}
/*
* CenterFrame entry callback
*/
static void
nova_center_entry_update (GtkWidget *widget,
gpointer data)
{
NovaCenter *center;
gint *val, new_val;
DEBUG1("entry\n");
val = data;
new_val = atoi ( gtk_entry_get_text( GTK_ENTRY(widget) ) );
if( *val != new_val )
{
*val = new_val;
center = gtk_object_get_user_data( GTK_OBJECT(widget) );
DEBUG1("entry:newval in_call=%d\n", center->in_call );
if( !center->in_call )
{
nova_center_cursor_update( center );
nova_center_draw ( center, CURSOR );
}
}
}
/*
* Update the cross cursor's coordinates accoding to pvals.[xy]center
* but not redraw it
*/
static void
nova_center_cursor_update (NovaCenter *center)
{
center->curx = pvals.xcenter * center->pwidth / center->dwidth;
center->cury = pvals.ycenter * center->pheight / center->dheight;
if( center->curx < 0 ) center->curx = 0;
else if( center->curx >= center->pwidth ) center->curx = center->pwidth-1;
if( center->cury < 0 ) center->cury = 0;
else if( center->cury >= center->pheight) center->cury = center->pheight-1;
}
/*
* Handle the expose event on the preview
*/
static gint
nova_center_preview_expose (GtkWidget *widget,
GdkEvent *event)
{
NovaCenter *center;
center = gtk_object_get_user_data( GTK_OBJECT(widget) );
nova_center_draw( center, ALL );
return FALSE;
}
/*
* Handle other events on the preview
*/
static gint
nova_center_preview_events (GtkWidget *widget,
GdkEvent *event)
{
NovaCenter *center;
GdkEventButton *bevent;
GdkEventMotion *mevent;
gchar buf[256];
center = gtk_object_get_user_data ( GTK_OBJECT(widget) );
switch (event->type)
{
case GDK_EXPOSE:
break;
case GDK_BUTTON_PRESS:
bevent = (GdkEventButton *) event;
center->curx = bevent->x;
center->cury = bevent->y;
goto mouse;
case GDK_MOTION_NOTIFY:
mevent = (GdkEventMotion *) event;
if ( !mevent->state ) break;
center->curx = mevent->x;
center->cury = mevent->y;
mouse:
nova_center_draw( center, CURSOR );
center->in_call = TRUE;
sprintf(buf, "%d", center->curx * center->dwidth / center->pwidth );
gtk_entry_set_text( GTK_ENTRY(center->xentry), buf );
sprintf(buf, "%d", center->cury * center->dheight / center->pheight );
gtk_entry_set_text( GTK_ENTRY(center->yentry), buf );
center->in_call = FALSE;
break;
default:
break;
}
return FALSE;
}
/*===================================================================
Entry - Scale Pair
====================================================================*/
/***********************************************************************/
/* */
/* Create new entry-scale pair with label. (int) */
/* 1 row and 2 cols of table are needed. */
/* */
/* `x' and `y' means starting row and col in `table'. */
/* */
/* `caption' is label string. */
/* */
/* `min', `max' are boundary of scale. */
/* */
/* `constraint' means whether value of *intvar should be constraint */
/* by scale adjustment, e.g. between `min' and `max'. */
/* */
/***********************************************************************/
static void
nova_int_entryscale_new (GtkTable *table,
gint x,
gint y,
gchar *caption,
gint *intvar,
gint min,
gint max,
gint constraint)
{
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *entry;
GtkWidget *scale;
GtkObject *adjustment;
NovaEntryScaleData *userdata;
gchar buffer[256];
label = gtk_label_new (caption);
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
adjustment = gtk_adjustment_new ( *intvar, min, max, 1.0, 1.0, 0.0);
scale = gtk_hscale_new ( GTK_ADJUSTMENT(adjustment) );
gtk_widget_set_usize (scale, SCALE_WIDTH, 0);
gtk_scale_set_draw_value (GTK_SCALE (scale), FALSE);
entry = gtk_entry_new ();
gtk_widget_set_usize (entry, ENTRY_WIDTH, 0);
sprintf( buffer, "%d", *intvar );
gtk_entry_set_text( GTK_ENTRY (entry), buffer );
userdata = g_new ( NovaEntryScaleData, 1 );
userdata->entry = entry;
userdata->adjustment = adjustment;
userdata->constraint = constraint;
gtk_object_set_user_data (GTK_OBJECT(entry), userdata);
gtk_object_set_user_data (GTK_OBJECT(adjustment), userdata);
gtk_signal_connect (GTK_OBJECT (entry), "changed",
(GtkSignalFunc) nova_paired_int_entry_update,
intvar);
gtk_signal_connect ( adjustment, "value_changed",
(GtkSignalFunc) nova_paired_int_scale_update,
intvar);
gtk_signal_connect ( GTK_OBJECT( entry ), "destroy",
(GtkSignalFunc) nova_paired_entry_destroy_callback,
userdata );
hbox = gtk_hbox_new ( FALSE, 5 );
gtk_box_pack_start (GTK_BOX (hbox), scale, TRUE, TRUE, 0);
gtk_box_pack_start (GTK_BOX (hbox), entry, FALSE, TRUE, 0);
gtk_table_attach (GTK_TABLE (table), label, x, x+1, y, y+1,
GTK_FILL, GTK_FILL, 0, 0);
gtk_table_attach (GTK_TABLE (table), hbox, x+1, x+2, y, y+1,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
gtk_widget_show (label);
gtk_widget_show (entry);
gtk_widget_show (scale);
gtk_widget_show (hbox);
}
/*
when destroyed, userdata is destroyed too
*/
static void
nova_paired_entry_destroy_callback (GtkWidget *widget,
gpointer data)
{
NovaEntryScaleData *userdata;
userdata = data;
g_free ( userdata );
}
/* scale callback (int) */
/* ==================== */
static void
nova_paired_int_scale_update (GtkAdjustment *adjustment,
gpointer data)
{
NovaEntryScaleData *userdata;
GtkEntry *entry;
gchar buffer[256];
gint *val, new_val;
val = data;
new_val = (gint) adjustment->value;
*val = new_val;
userdata = gtk_object_get_user_data (GTK_OBJECT (adjustment));
entry = GTK_ENTRY( userdata->entry );
sprintf (buffer, "%d", (int) new_val );
/* avoid infinite loop (scale, entry, scale, entry ...) */
gtk_signal_handler_block_by_data ( GTK_OBJECT(entry), data );
gtk_entry_set_text ( entry, buffer);
gtk_signal_handler_unblock_by_data ( GTK_OBJECT(entry), data );
}
/*
entry callback (int)
*/
static void
nova_paired_int_entry_update (GtkWidget *widget,
gpointer data)
{
NovaEntryScaleData *userdata;
GtkAdjustment *adjustment;
int new_val, constraint_val;
int *val;
val = data;
new_val = atoi (gtk_entry_get_text (GTK_ENTRY (widget)));
*val = new_val;
userdata = gtk_object_get_user_data (GTK_OBJECT (widget));
adjustment = GTK_ADJUSTMENT( userdata->adjustment );
constraint_val = new_val;
if ( constraint_val < adjustment->lower )
constraint_val = adjustment->lower;
if ( constraint_val > adjustment->upper )
constraint_val = adjustment->upper;
if ( userdata->constraint )
*val = constraint_val;
else
*val = new_val;
adjustment->value = constraint_val;
gtk_signal_handler_block_by_data ( GTK_OBJECT(adjustment), data );
gtk_signal_emit_by_name ( GTK_OBJECT(adjustment), "value_changed");
gtk_signal_handler_unblock_by_data ( GTK_OBJECT(adjustment), data );
}
/*
################################################################
## ##
## Main Calculation ##
## ##
################################################################
*/
static double gauss()
{
double sum=0;
int i;
for(i=0; i<6; i++)
sum+=(double)rand()/RAND_MAX;
return sum/6;
}
static void
nova (GDrawable *drawable)
{
GPixelRgn src_rgn, dest_rgn;
gpointer pr;
guchar *src_row, *dest_row;
guchar *src, *dest;
gint x1, y1, x2, y2;
gint row, col;
gint x, y;
gint alpha, has_alpha, bpp;
gint progress, max_progress;
/****************/
gint xc, yc; /* center of image */
gdouble u, v;
gdouble l, l0;
gdouble w, w1, c;
gdouble *spoke;
gdouble nova_alpha;
gdouble src_alpha;
gdouble new_alpha;
gdouble compl_ratio;
gdouble ratio;
gdouble r, g, b, h, s, lu;
gdouble spokecol;
gint i, j;
gint color[4];
gint *spokecolor;
/* initialize */
new_alpha = 0.0;
srand(time(NULL));
spoke = g_new( gdouble, pvals.nspoke );
spokecolor = g_new (gint, 3 * pvals.nspoke);
rgb_to_hsl (pvals.color[0]/255.0, pvals.color[1]/255.0, pvals.color[2]/255.0, &h, &s, &lu);
for( i=0; i<pvals.nspoke; i++ )
{
spoke[i] = gauss();
h += (gdouble)pvals.randomhue / 360.0 * ((gdouble) rand() / (gdouble) RAND_MAX - 0.5) ;
if (h < 0) h += 1.0;
else if (h >= 1.0) h -= 1.0;
hsl_to_rgb (h, s, lu, &r, &g, &b);
spokecolor[3*i+0] = 255.0 * r;
spokecolor[3*i+1] = 255.0 * g;
spokecolor[3*i+2] = 255.0 * b;
}
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
/*
xc = (x1+x2)/2;
yc = (y1+y2)/2; */
xc = pvals.xcenter;
yc = pvals.ycenter;
l0 = (x2-xc)/4+1; /* standard length */
bpp = gimp_drawable_bpp (drawable->id);
has_alpha = gimp_drawable_has_alpha (drawable->id);
alpha = (has_alpha) ? bpp - 1 : bpp;
gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, x2-x1, y2-y1, FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable, x1, y1, x2-x1, y2-y1, TRUE, TRUE);
/* Initialize progress */
progress = 0;
max_progress = (x2 - x1) * (y2 - y1);
for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
pr != NULL; pr = gimp_pixel_rgns_process (pr))
{
src_row = src_rgn.data;
dest_row = dest_rgn.data;
for ( row = 0, y = src_rgn.y; row < src_rgn.h; row++, y++)
{
src = src_row;
dest = dest_row;
for ( col = 0, x = src_rgn.x; col < src_rgn.w; col++, x++)
{
u = (gdouble) (x-xc) / pvals.radius;
v = (gdouble) (y-yc) / pvals.radius;
l = sqrt( u*u + v*v );
/* This algorithm is still under construction. */
c = (atan2 (u, v) / (2 * M_PI) + .51) * pvals.nspoke;
i = (int) floor (c);
c -= i;
i %= pvals.nspoke;
w1 = spoke[i] * (1 - c) + spoke[(i + 1) % pvals.nspoke] * c;
w1 = w1 * w1;
w = 1/(l+0.001)*0.9;
nova_alpha = CLAMP (w, 0.0, 1.0);
if (has_alpha)
{
src_alpha = (gdouble) src[alpha] / 255.0;
new_alpha = src_alpha + (1.0 - src_alpha) * nova_alpha;
if (new_alpha != 0.0)
ratio = nova_alpha / new_alpha;
else
ratio = 0.0;
}
else
ratio = nova_alpha;
compl_ratio = 1.0 - ratio;
for (j = 0; j < alpha; j++)
{
spokecol = (gdouble)spokecolor[3*i+j]*(1.0-c) + (gdouble)spokecolor[3*((i + 1) % pvals.nspoke)+j]*c;
if (w > 1.0)
color[j] = CLAMP (spokecol * w, 0, 255);
else
color[j] = src[j] * compl_ratio + spokecol * ratio;
c = CLAMP (w1 * w, 0, 1);
color[j] = color[j] + 255 * c;
dest[j]= CLAMP (color[j], 0, 255);
}
if (has_alpha)
dest[alpha] = new_alpha * 255.0;
src += src_rgn.bpp;
dest += dest_rgn.bpp;
}
src_row += src_rgn.rowstride;
dest_row += dest_rgn.rowstride;
}
/* Update progress */
progress += src_rgn.w * src_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->id, TRUE);
gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
g_free( spoke );
g_free( spokecolor );
}
/*
* RGB-HSL transforms.
* Ken Fishkin, Pixar Inc., January 1989.
*/
/*
* given r,g,b on [0 ... 1],
* return (h,s,l) on [0 ... 1]
*/
static void
rgb_to_hsl (gdouble r,
gdouble g,
gdouble b,
gdouble *h,
gdouble *s,
gdouble *l)
{
gdouble v;
gdouble m;
gdouble vm;
gdouble r2, g2, b2;
v = MAX(r,g);
v = MAX(v,b);
m = MIN(r,g);
m = MIN(m,b);
if ((*l = (m + v) / 2.0) <= 0.0)
return;
if ((*s = vm = v - m) > 0.0)
{
*s /= (*l <= 0.5) ? (v + m ) : (2.0 - v - m) ;
}
else
return;
r2 = (v - r) / vm;
g2 = (v - g) / vm;
b2 = (v - b) / vm;
if (r == v)
*h = (g == m ? 5.0 + b2 : 1.0 - g2);
else if (g == v)
*h = (b == m ? 1.0 + r2 : 3.0 - b2);
else
*h = (r == m ? 3.0 + g2 : 5.0 - r2);
*h /= 6;
}
/*
* given h,s,l on [0..1],
* return r,g,b on [0..1]
*/
static void
hsl_to_rgb (gdouble h,
gdouble sl,
gdouble l,
gdouble *r,
gdouble *g,
gdouble *b)
{
gdouble v;
v = (l <= 0.5) ? (l * (1.0 + sl)) : (l + sl - l * sl);
if (v <= 0)
{
*r = *g = *b = 0.0;
}
else
{
gdouble m;
gdouble sv;
gint sextant;
gdouble fract, vsf, mid1, mid2;
m = l + l - v;
sv = (v - m ) / v;
h *= 6.0;
sextant = h;
fract = h - sextant;
vsf = v * sv * fract;
mid1 = m + vsf;
mid2 = v - vsf;
switch (sextant)
{
case 0: *r = v; *g = mid1; *b = m; break;
case 1: *r = mid2; *g = v; *b = m; break;
case 2: *r = m; *g = v; *b = mid1; break;
case 3: *r = m; *g = mid2; *b = v; break;
case 4: *r = mid1; *g = m; *b = v; break;
case 5: *r = v; *g = m; *b = mid2; break;
}
}
}
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