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gimp/plug-ins/common/blinds.c

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/*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This is a plug-in for the GIMP.
*
* Blinds plug-in. Distort an image as though it was stuck to
* window blinds and the blinds where opened/closed.
*
* Copyright (C) 1997 Andy Thomas alt@picnic.demon.co.uk
*
* 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.
*
* A fair proprotion of this code was taken from the Whirl plug-in
* which was copyrighted by Federico Mena Quintero (as below).
*
* Whirl plug-in --- distort an image into a whirlpool
* Copyright (C) 1997 Federico Mena Quintero
*
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/***** Magic numbers *****/
#define SCALE_WIDTH 150
#define MAX_FANS 10
#define HORIZONTAL 0
#define VERTICAL 1
/* Variables set in dialog box */
typedef struct data
{
gint angledsp;
gint numsegs;
gint orientation;
gboolean bg_trans;
gboolean preview;
} BlindVals;
/* Array to hold each size of fans. And no there are not each the
* same size (rounding errors...)
*/
static gint fanwidths[MAX_FANS];
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gboolean blinds_dialog (GimpDrawable *drawable);
static void dialog_update_preview (GimpDrawable *drawable,
GimpPreview *preview);
static void apply_blinds (GimpDrawable *drawable);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
/* Values when first invoked */
static BlindVals bvals =
{
30,
3,
HORIZONTAL, /* orientation */
FALSE,
TRUE /* preview */
};
MAIN ()
static void
query (void)
{
static GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "angle_dsp", "Angle of Displacement " },
{ GIMP_PDB_INT32, "number_of_segments", "Number of segments in blinds" },
{ GIMP_PDB_INT32, "orientation", "orientation; 0 = Horizontal, 1 = Vertical" },
{ GIMP_PDB_INT32, "backgndg_trans", "background transparent; FALSE,TRUE" }
};
gimp_install_procedure ("plug_in_blinds",
"Adds a blinds effect to the image. Rather like "
"putting the image on a set of window blinds and "
"the closing or opening the blinds",
"More here later",
"Andy Thomas",
"Andy Thomas",
"1997",
N_("_Blinds..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register ("plug_in_blinds", "<Image>/Filters/Distorts");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
INIT_I18N ();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
drawable = gimp_drawable_get (param[2].data.d_drawable);
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data ("plug_in_blinds", &bvals);
if (! blinds_dialog(drawable))
{
gimp_drawable_detach (drawable);
return;
}
break;
case GIMP_RUN_NONINTERACTIVE:
if (nparams != 7)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
bvals.angledsp = param[3].data.d_int32;
bvals.numsegs = param[4].data.d_int32;
bvals.orientation = param[5].data.d_int32;
bvals.bg_trans = param[6].data.d_int32;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data ("plug_in_blinds", &bvals);
break;
default:
break;
}
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init ( _("Adding Blinds..."));
apply_blinds (drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data ("plug_in_blinds", &bvals, sizeof (BlindVals));
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static gboolean
blinds_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *hbox;
GtkWidget *frame;
GtkWidget *table;
GtkObject *size_data;
GtkWidget *toggle;
GtkWidget *horizontal;
GtkWidget *vertical;
gboolean run;
gimp_ui_init ("blinds", TRUE);
dialog = gimp_dialog_new (_("Blinds"), "blinds",
NULL, 0,
gimp_standard_help_func, "plug-in-blinds",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
main_vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dialog)->vbox), main_vbox);
gtk_widget_show (main_vbox);
preview = gimp_aspect_preview_new (drawable, &bvals.preview);
gtk_box_pack_start_defaults (GTK_BOX (main_vbox), preview);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (dialog_update_preview),
drawable);
hbox = gtk_hbox_new (FALSE, 12);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
frame =
gimp_int_radio_group_new (TRUE, _("Orientation"),
G_CALLBACK (gimp_radio_button_update),
&bvals.orientation, bvals.orientation,
_("_Horizontal"), HORIZONTAL, &horizontal,
_("_Vertical"), VERTICAL, &vertical,
NULL);
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
g_signal_connect_swapped (horizontal, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (vertical, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
frame = gimp_frame_new (_("Background"));
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
toggle = gtk_check_button_new_with_mnemonic (_("_Transparent"));
gtk_container_add (GTK_CONTAINER (frame), toggle);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&bvals.bg_trans);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), bvals.bg_trans);
if (!gimp_drawable_has_alpha (drawable->drawable_id))
{
gtk_widget_set_sensitive (toggle, FALSE);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), FALSE);
}
table = gtk_table_new (2, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
gtk_widget_show (table);
size_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Displacement:"), SCALE_WIDTH, 0,
bvals.angledsp, 1, 90, 1, 15, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (size_data, "value_changed",
G_CALLBACK (gimp_int_adjustment_update),
&bvals.angledsp);
g_signal_connect_swapped (size_data, "value_changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
size_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("_Number of segments:"), SCALE_WIDTH, 0,
bvals.numsegs, 1, MAX_FANS, 1, 2, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (size_data, "value_changed",
G_CALLBACK (gimp_int_adjustment_update),
&bvals.numsegs);
g_signal_connect_swapped (size_data, "value_changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
blindsapply (guchar *srow,
guchar *drow,
gint width,
gint bpp,
guchar *bg)
{
guchar *src;
guchar *dst;
gint i,j,k;
gdouble ang;
gint available;
/* Make the row 'shrink' around points along its length */
/* The bvals.numsegs determins how many segments to slip it in to */
/* The angle is the conceptual 'rotation' of each of these segments */
/* Note the row is considered to be made up of a two dim array actual
* pixel locations and the RGB colour at these locations.
*/
/* In the process copy the src row to the destination row */
/* Fill in with background color ? */
for (i = 0 ; i < width ; i++)
{
dst = &drow[i*bpp];
for (j = 0 ; j < bpp; j++)
{
dst[j] = bg[j];
}
}
/* Apply it */
available = width;
for (i = 0; i < bvals.numsegs; i++)
{
/* Width of segs are variable */
fanwidths[i] = available / (bvals.numsegs - i);
available -= fanwidths[i];
}
/* do center points first - just for fun...*/
available = 0;
for (k = 1; k <= bvals.numsegs; k++)
{
int point;
point = available + fanwidths[k - 1] / 2;
available += fanwidths[k - 1];
src = &srow[point * bpp];
dst = &drow[point * bpp];
/* Copy pixels across */
for (j = 0 ; j < bpp; j++)
{
dst[j] = src[j];
}
}
/* Disp for each point */
ang = (bvals.angledsp * 2 * G_PI) / 360; /* Angle in rads */
ang = (1 - fabs (cos (ang)));
available = 0;
for (k = 0 ; k < bvals.numsegs; k++)
{
int dx; /* Amount to move by */
int fw;
for (i = 0 ; i < (fanwidths[k]/2) ; i++)
{
/* Copy pixels across of left half of fan */
fw = fanwidths[k] / 2;
dx = (int) (ang * ((double) (fw - (double)(i % fw))));
src = &srow[(available + i) * bpp];
dst = &drow[(available + i + dx) * bpp];
for (j = 0; j < bpp; j++)
{
dst[j] = src[j];
}
/* Right side */
j = i + 1;
src = &srow[(available + fanwidths[k] - j
- (fanwidths[k] % 2)) * bpp];
dst = &drow[(available + fanwidths[k] - j
- (fanwidths[k] % 2) - dx) * bpp];
for (j = 0; j < bpp; j++)
{
dst[j] = src[j];
}
}
available += fanwidths[k];
}
}
static void
dialog_update_preview (GimpDrawable *drawable,
GimpPreview *preview)
{
gint y;
guchar *p, *buffer, *cache;
GimpRGB background;
guchar bg[4];
gint width, height, bpp;
gimp_preview_get_size (preview, &width, &height);
bpp = gimp_drawable_bpp (drawable->drawable_id);
cache = gimp_drawable_get_thumbnail_data (drawable->drawable_id,
&width, &height, &bpp);
p = cache;
gimp_context_get_background (&background);
if (bvals.bg_trans)
gimp_rgb_set_alpha (&background, 0.0);
gimp_drawable_get_color_uchar (drawable->drawable_id, &background, bg);
buffer = g_new (guchar, width * height * bpp);
if (bvals.orientation)
{
for (y = 0; y < height; y++)
{
blindsapply (p,
buffer + y * width * bpp,
width,
bpp, bg);
p += width * bpp;
}
}
else
{
/* Horizontal blinds */
/* Apply the blinds algo to a single column -
* this act as a transfomation matrix for the
* rows. Make row 0 invalid so we can find it again!
*/
gint i;
guchar *sr = g_new (guchar, height * 4);
guchar *dr = g_new0 (guchar, height * 4);
guchar dummybg[4] = {0, 0, 0, 0};
/* Fill in with background color ? */
for (i = 0 ; i < width ; i++)
{
gint j;
gint bd = bpp;
guchar *dst;
dst = &buffer[i * bd];
for (j = 0 ; j < bd; j++)
{
dst[j] = bg[j];
}
}
for ( y = 0 ; y < height; y++)
{
sr[y] = y+1;
}
/* Bit of a fiddle since blindsapply really works on an image
* row not a set of bytes. - preview can't be > 255
* or must make dr sr int rows.
*/
blindsapply (sr, dr, height, 1, dummybg);
for (y = 0; y < height; y++)
{
if (dr[y] == 0)
{
/* Draw background line */
p = buffer;
}
else
{
/* Draw line from src */
p = cache +
(width * bpp * (dr[y] - 1));
}
memcpy (buffer + y * width * bpp,
p,
width * bpp);
}
g_free (sr);
g_free (dr);
}
gimp_preview_draw_buffer (preview, buffer, width * bpp);
g_free (buffer);
g_free (cache);
}
/* STEP tells us how many rows/columns to gulp down in one go... */
/* Note all the "4" literals around here are to do with the depths
* of the images. Makes it easier to deal with for my small brain.
*/
#define STEP 40
static void
apply_blinds (GimpDrawable *drawable)
{
GimpPixelRgn des_rgn;
GimpPixelRgn src_rgn;
guchar *src_rows, *des_rows;
gint x, y;
GimpRGB background;
guchar bg[4];
gint sel_x1, sel_y1, sel_x2, sel_y2;
gint sel_width, sel_height;
gimp_context_get_background (&background);
if (bvals.bg_trans)
gimp_rgb_set_alpha (&background, 0.0);
gimp_drawable_get_color_uchar (drawable->drawable_id, &background, bg);
gimp_drawable_mask_bounds (drawable->drawable_id,
&sel_x1, &sel_y1, &sel_x2, &sel_y2);
sel_width = sel_x2 - sel_x1;
sel_height = sel_y2 - sel_y1;
gimp_pixel_rgn_init (&src_rgn, drawable,
sel_x1, sel_y1, sel_width, sel_height, FALSE, FALSE);
gimp_pixel_rgn_init (&des_rgn, drawable,
sel_x1, sel_y1, sel_width, sel_height, TRUE, TRUE);
src_rows = g_new (guchar, MAX (sel_width, sel_height) * 4 * STEP);
des_rows = g_new (guchar, MAX (sel_width, sel_height) * 4 * STEP);
if (bvals.orientation)
{
for (y = 0; y < sel_height; y += STEP)
{
gint rr;
gint step;
if((y + STEP) > sel_height)
step = sel_height - y;
else
step = STEP;
gimp_pixel_rgn_get_rect (&src_rgn,
src_rows,
sel_x1,
sel_y1 + y,
sel_width,
step);
/* OK I could make this better */
for (rr = 0; rr < STEP; rr++)
blindsapply (src_rows + (sel_width * rr * src_rgn.bpp),
des_rows + (sel_width * rr * src_rgn.bpp),
sel_width, src_rgn.bpp, bg);
gimp_pixel_rgn_set_rect (&des_rgn,
des_rows,
sel_x1,
sel_y1 + y,
sel_width,
step);
gimp_progress_update ((double) y / (double) sel_height);
}
}
else
{
/* Horizontal blinds */
/* Apply the blinds algo to a single column -
* this act as a transfomation matrix for the
* rows. Make row 0 invalid so we can find it again!
*/
gint i;
gint *sr = g_new (gint, sel_height * 4);
gint *dr = g_new (gint, sel_height * 4);
guchar *dst = g_new (guchar, STEP * 4);
guchar dummybg[4];
memset (dummybg, 0, 4);
memset (dr, 0, sel_height * 4); /* all dr rows are background rows */
for (y = 0; y < sel_height; y++)
{
sr[y] = y+1;
}
/* Hmmm. does this work portably? */
/* This "swaps the intergers around that are held in in the
* sr & dr arrays.
*/
blindsapply ((guchar *) sr, (guchar *) dr,
sel_height, sizeof (gint), dummybg);
/* Fill in with background color ? */
for (i = 0 ; i < STEP ; i++)
{
int j;
guchar *bgdst;
bgdst = &dst[i * src_rgn.bpp];
for (j = 0 ; j < src_rgn.bpp; j++)
{
bgdst[j] = bg[j];
}
}
for (x = 0; x < sel_width; x += STEP)
{
int rr;
int step;
guchar *p;
if((x + STEP) > sel_width)
step = sel_width - x;
else
step = STEP;
gimp_pixel_rgn_get_rect (&src_rgn,
src_rows,
sel_x1 + x,
sel_y1,
step,
sel_height);
/* OK I could make this better */
for (rr = 0; rr < sel_height; rr++)
{
if(dr[rr] == 0)
{
/* Draw background line */
p = dst;
}
else
{
/* Draw line from src */
p = src_rows + (step * src_rgn.bpp * (dr[rr] - 1));
}
memcpy (des_rows + (rr * step * src_rgn.bpp), p,
step * src_rgn.bpp);
}
gimp_pixel_rgn_set_rect (&des_rgn,
des_rows,
sel_x1 + x,
sel_y1,
step,
sel_height);
gimp_progress_update ((double) x / (double) sel_width);
}
g_free (dst);
g_free (sr);
g_free (dr);
}
g_free (src_rows);
g_free (des_rows);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id,
sel_x1, sel_y1, sel_width, sel_height);
}
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