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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
*
*/
/* Change log:-
*
* Version 0.5 10 June 1997.
* Changes required to work with 0.99.10.
*
* Version 0.4 20 May 1997.
* Fixed problem with using this plugin in GIMP_RUN_NONINTERACTIVE mode
*
* Version 0.3 8 May 1997.
* Make preview work in Quartics words "The Right Way".
*
* Allow the background to be transparent.
*
* Version 0.2 1 May 1997 (not released).
* Added patches supplied by Tim Mooney mooney@dogbert.cc.ndsu.NoDak.edu
* to allow the plug-in to build with Digitals compiler.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/***** Magic numbers *****/
/* Don't make preview >255!!! It won't work for horizontal blinds */
#define PREVIEW_SIZE 128
#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;
gint bg_trans;
} BlindVals;
typedef struct
{
GtkWidget *preview;
guchar preview_row[PREVIEW_SIZE * 4];
gint run;
guchar *pv_cache;
gint img_bpp;
} BlindsInterface;
static BlindsInterface bint =
{
NULL, /* Preview */
{ '4', 'u' }, /* Preview_row */
FALSE, /* run */
NULL,
4 /* bpp of drawable */
};
/* Array to hold each size of fans. And no there are not each the
* same size (rounding errors...)
*/
gint fanwidths[MAX_FANS];
GimpDrawable *blindsdrawable;
static void query (void);
static void run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gint blinds_dialog (void);
static void blinds_ok_callback (GtkWidget *widget,
gpointer data);
static void blinds_scale_update (GtkAdjustment *adjustment,
gint *size_val);
static void blinds_radio_update (GtkWidget *widget,
gpointer data);
static void blinds_button_update (GtkWidget *widget,
gpointer data);
static void dialog_update_preview (void);
static void cache_preview (void);
static void apply_blinds (void);
static int blinds_get_bg (guchar *bg);
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,
FALSE
};
/* Stuff for the preview bit */
static gint sel_x1, sel_y1, sel_x2, sel_y2;
static gint sel_width, sel_height;
static gint preview_width, preview_height;
static gint has_alpha;
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" }
};
static gint nargs = sizeof (args) / sizeof (args[0]);
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_("<Image>/Filters/Distorts/Blinds..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
nargs, 0,
args, NULL);
}
static void
run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunModeType run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
gint pwidth, pheight;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
if (run_mode == GIMP_RUN_INTERACTIVE)
{
INIT_I18N_UI();
}
else
{
INIT_I18N();
}
blindsdrawable = drawable =
gimp_drawable_get (param[2].data.d_drawable);
gimp_drawable_mask_bounds (drawable->id, &sel_x1, &sel_y1, &sel_x2, &sel_y2);
sel_width = sel_x2 - sel_x1;
sel_height = sel_y2 - sel_y1;
/* Calculate preview size */
if (sel_width > sel_height)
{
pwidth = MIN (sel_width, PREVIEW_SIZE);
pheight = sel_height * pwidth / sel_width;
}
else
{
pheight = MIN (sel_height, PREVIEW_SIZE);
pwidth = sel_width * pheight / sel_height;
}
preview_width = MAX (pwidth, 2); /* Min size is 2 */
preview_height = MAX (pheight, 2);
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data ("plug_in_blinds", &bvals);
if (! blinds_dialog())
{
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->id) ||
gimp_drawable_is_gray (drawable->id))
{
gimp_progress_init ( _("Adding Blinds..."));
apply_blinds ();
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);
}
/* Build the dialog up. This was the hard part! */
static gint
blinds_dialog (void)
{
GtkWidget *dlg;
GtkWidget *main_vbox;
GtkWidget *hbox;
GtkWidget *vbox;
GtkWidget *frame;
GtkWidget *toggle_vbox;
GtkWidget *xframe;
GtkWidget *table;
GtkObject *size_data;
GtkWidget *toggle;
gimp_ui_init ("blinds", TRUE);
cache_preview (); /* Get the preview image and store it also set has_alpha */
dlg = gimp_dialog_new (_("Blinds"), "blinds",
gimp_standard_help_func, "filters/blinds.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
_("OK"), blinds_ok_callback,
NULL, NULL, NULL, TRUE, FALSE,
_("Cancel"), gtk_widget_destroy,
NULL, 1, NULL, FALSE, TRUE,
NULL);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit),
NULL);
main_vbox = gtk_vbox_new (FALSE, 4);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 6);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dlg)->vbox), main_vbox);
gtk_widget_show (main_vbox);
hbox = gtk_hbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
frame = gtk_frame_new (_("Preview"));
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (1, 1, FALSE);
gtk_container_set_border_width (GTK_CONTAINER (table), 4);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_widget_show (table);
xframe = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (xframe), GTK_SHADOW_IN);
gtk_table_attach (GTK_TABLE (table), xframe, 0, 1, 0, 1,
GTK_EXPAND, GTK_EXPAND, 0, 0);
gtk_widget_show (xframe);
bint.preview = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (bint.preview), preview_width, preview_height);
gtk_container_add (GTK_CONTAINER (xframe), bint.preview);
gtk_widget_show(bint.preview);
vbox = gtk_vbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, TRUE, 0);
gtk_widget_show (vbox);
frame =
gimp_radio_group_new2 (TRUE, _("Orientation"),
blinds_radio_update,
&bvals.orientation, (gpointer) bvals.orientation,
_("Horizontal"), (gpointer) HORIZONTAL, NULL,
_("Vertical"), (gpointer) VERTICAL, NULL,
NULL);
gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
frame = gtk_frame_new (_("Background"));
gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
toggle_vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (toggle_vbox), 2);
gtk_container_add (GTK_CONTAINER (frame), toggle_vbox);
toggle = gtk_check_button_new_with_label (_("Transparent"));
gtk_box_pack_start (GTK_BOX (toggle_vbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (blinds_button_update),
&bvals.bg_trans);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), bvals.bg_trans);
if (!has_alpha)
{
gtk_widget_set_sensitive (toggle, FALSE);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), FALSE);
}
gtk_widget_show (toggle);
gtk_widget_show (toggle_vbox);
gtk_widget_show (frame);
frame = gtk_frame_new (_("Parameter Settings"));
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
table = gtk_table_new (2, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_container_set_border_width (GTK_CONTAINER (table), 4);
gtk_container_add (GTK_CONTAINER (frame), 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);
gtk_signal_connect (GTK_OBJECT (size_data), "value_changed",
GTK_SIGNAL_FUNC (blinds_scale_update),
&bvals.angledsp);
size_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("Num Segments:"), SCALE_WIDTH, 0,
bvals.numsegs, 1, MAX_FANS, 1, 2, 0,
TRUE, 0, 0,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (size_data), "value_changed",
GTK_SIGNAL_FUNC (blinds_scale_update),
&bvals.numsegs);
gtk_widget_show (frame);
gtk_widget_show (table);
gtk_widget_show (dlg);
dialog_update_preview ();
gtk_main ();
gdk_flush ();
return bint.run;
}
static void
blinds_ok_callback (GtkWidget *widget,
gpointer data)
{
bint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static void
blinds_radio_update (GtkWidget *widget,
gpointer data)
{
gimp_radio_button_update (widget, data);
if (GTK_TOGGLE_BUTTON (widget)->active)
dialog_update_preview ();
}
static void
blinds_button_update (GtkWidget *widget,
gpointer data)
{
gimp_toggle_button_update (widget, data);
dialog_update_preview ();
}
static void
blinds_scale_update (GtkAdjustment *adjustment,
gint *value)
{
gimp_int_adjustment_update (adjustment, value);
dialog_update_preview ();
}
/* Cache the preview image - updates are a lot faster. */
/* The preview_cache will contain the small image */
static void
cache_preview (void)
{
GimpPixelRgn src_rgn;
int y,x;
guchar *src_rows;
guchar *p;
int isgrey = 0;
gimp_pixel_rgn_init (&src_rgn, blindsdrawable,
sel_x1, sel_y1, sel_width, sel_height, FALSE, FALSE);
src_rows = g_new (guchar, sel_width * 4);
p = bint.pv_cache = g_new (guchar, preview_width * preview_height * 4);
bint.img_bpp = gimp_drawable_bpp (blindsdrawable->id);
has_alpha = gimp_drawable_has_alpha (blindsdrawable->id);
if (bint.img_bpp < 3)
{
bint.img_bpp = 3 + has_alpha;
}
switch (gimp_drawable_type (blindsdrawable->id))
{
case GIMP_GRAYA_IMAGE:
case GIMP_GRAY_IMAGE:
isgrey = 1;
default:
break;
}
for (y = 0; y < preview_height; y++)
{
gimp_pixel_rgn_get_row (&src_rgn,
src_rows,
sel_x1,
sel_y1 + (y * sel_height) / preview_height,
sel_width);
for (x = 0; x < (preview_width); x++)
{
/* Get the pixels of each col */
gint i;
for (i = 0 ; i < 3; i++)
p[x * bint.img_bpp + i] =
src_rows[((x * sel_width) / preview_width) * src_rgn.bpp +
((isgrey) ? 0 : i)];
if (has_alpha)
p[x * bint.img_bpp + 3] =
src_rows[((x * sel_width) / preview_width) * src_rgn.bpp +
((isgrey) ? 1 : 3)];
}
p += (preview_width * bint.img_bpp);
}
g_free (src_rows);
}
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 int
blinds_get_bg (guchar *bg)
{
/* Get the background color */
int retval = FALSE; /*Return TRUE if of GREYA type */
switch (gimp_drawable_type (blindsdrawable->id))
{
case GIMP_RGBA_IMAGE:
bg[3] = bvals.bg_trans ? 0 : 255;
break;
case GIMP_RGB_IMAGE :
gimp_palette_get_background (&bg[0], &bg[1], &bg[2]);
break;
case GIMP_GRAYA_IMAGE:
retval = TRUE;
bg[3] = bvals.bg_trans ? 0 : 255;
break;
case GIMP_GRAY_IMAGE:
bg[2] = 0;
bg[1] = 0;
bg[0] = 0;
break;
default:
break;
}
return retval;
}
static void
dialog_update_preview (void)
{
int y;
guchar *p;
guchar bg[4];
gint check, check_0, check_1;
p = bint.pv_cache;
blinds_get_bg (bg);
if (bvals.orientation)
{
for (y = 0; y < preview_height; y++)
{
/* bint.preview_row - this row contains the row to apply the action to */
blindsapply (p, bint.preview_row, preview_width, bint.img_bpp, bg);
if ((y / GIMP_CHECK_SIZE) & 1)
{
check_0 = GIMP_CHECK_DARK * 255;
check_1 = GIMP_CHECK_LIGHT * 255;
}
else
{
check_0 = GIMP_CHECK_LIGHT * 255;
check_1 = GIMP_CHECK_DARK * 255;
}
if (bint.img_bpp > 3)
{
int i,j;
for (i = 0, j = 0 ; i < sizeof(bint.preview_row); i += 4, j += 3 )
{
gint alphaval;
if (((i/4) / GIMP_CHECK_SIZE) & 1)
check = check_0;
else
check = check_1;
alphaval = bint.preview_row[i + 3];
bint.preview_row[j] =
check + (((bint.preview_row[i] - check)*alphaval)/255);
bint.preview_row[j + 1] =
check + (((bint.preview_row[i + 1] - check)*alphaval)/255);
bint.preview_row[j + 2] =
check + (((bint.preview_row[i + 2] - check)*alphaval)/255);
}
}
gtk_preview_draw_row(GTK_PREVIEW(bint.preview),
bint.preview_row, 0, y, preview_width);
p += preview_width * bint.img_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!
*/
int i;
int loop1,loop2;
guchar *sr = g_new(guchar,(preview_height)*4);
guchar *dr = g_new(guchar,(preview_height)*4);
guchar dummybg[4];
/* Copy into here after translation*/
guchar copy_row[PREVIEW_SIZE*4];
memset (dummybg, 0, 4);
memset (dr, 0, (preview_height) * 4); /* all dr rows are background rows */
/* Fill in with background color ? */
for (i = 0 ; i < preview_width ; i++)
{
int j;
int bd = bint.img_bpp;
guchar *dst;
dst = &bint.preview_row[i*bd];
for (j = 0 ; j < bd; j++)
{
dst[j] = bg[j];
}
}
for ( y = 0 ; y < preview_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, preview_height, 1, dummybg);
for (y = 0; y < preview_height; y++)
{
if ((y / GIMP_CHECK_SIZE) & 1)
{
check_0 = GIMP_CHECK_DARK * 255;
check_1 = GIMP_CHECK_LIGHT * 255;
}
else
{
check_0 = GIMP_CHECK_LIGHT * 255;
check_1 = GIMP_CHECK_DARK * 255;
}
if (dr[y] == 0)
{
/* Draw background line */
p = bint.preview_row;
}
else
{
/* Draw line from src */
p = bint.pv_cache + (preview_width * bint.img_bpp * (dr[y] - 1));
}
if (bint.img_bpp > 3)
{
/* Take account of alpha channel HERE*/
for (loop1 = 0, loop2 = 0 ;
loop1 < preview_width*bint.img_bpp;
loop1 += 4, loop2 += 3)
{
gint alphaval;
if (((loop1/4) / GIMP_CHECK_SIZE) & 1)
check = check_0;
else
check = check_1;
alphaval = p[loop1 + 3];
copy_row[loop2] =
check + (((p[loop1] - check) * alphaval) / 255);
copy_row[loop2 + 1] =
check + (((p[loop1 + 1] - check) * alphaval) / 255);
copy_row[loop2 + 2] =
check + (((p[loop1 + 2] - check) * alphaval) / 255);
}
p = &copy_row[0];
}
gtk_preview_draw_row (GTK_PREVIEW (bint.preview),
p, 0, y, preview_width);
}
g_free (sr);
g_free (dr);
}
gtk_widget_draw (bint.preview, NULL);
gdk_flush ();
}
/* 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 (void)
{
GimpPixelRgn des_rgn;
GimpPixelRgn src_rgn;
guchar *src_rows,*des_rows;
int x,y;
guchar bg[4];
/* Adjust aplha channel if GREYA */
if (blinds_get_bg (bg) == TRUE)
bg[1] = bvals.bg_trans ? 0 : 255;
gimp_pixel_rgn_init (&src_rgn, blindsdrawable,
sel_x1, sel_y1, sel_width, sel_height, FALSE, FALSE);
gimp_pixel_rgn_init (&des_rgn, blindsdrawable,
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)
{
int rr;
int 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!
*/
int 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 (blindsdrawable);
gimp_drawable_merge_shadow (blindsdrawable->id, TRUE);
gimp_drawable_update (blindsdrawable->id,
sel_x1, sel_y1, sel_width, sel_height);
}
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