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gimp/plug-ins/common/tiler.c

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/* Tiler v0.31
* 22 May 1997
* Tim Rowley <tor@cs.brown.edu>
*
* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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.
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-make-seamless"
/* Declare local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void tile (GimpDrawable *drawable);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Alters edges to make the image seamlessly tileable"),
"This plugin creates a seamless tileable from "
"the input drawable",
"Tim Rowley",
"Tim Rowley",
"1997",
N_("_Make Seamless"),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Map");
}
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 ();
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
tile(drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static void
weld_pixels (guchar *dest1,
guchar *dest2,
gint width,
gint height,
gint x,
gint y,
guint bpp,
guchar *src1,
guchar *src2)
{
gdouble a = (ABS(x - width) - 1)/ (gdouble) (width - 1);
gdouble b = (ABS(y - height) - 1) / (gdouble) (height - 1);
gdouble w;
guint i;
/* mimic ambiguous point handling in original algorithm */
if (a < 1e-8 && b > 0.99999999)
w = 1.0;
else if (a > 0.99999999 && b < 1e-8)
w = 0.0;
else
w = 1.0 - a*b/(a*b + (1.0 - a)*(1.0 - b));
for (i = 0; i < bpp; i++)
dest1[i] = dest2[i] = (guchar) (w * src1[i] + (1.0 - w) * src2[i]);
}
static void
weld_pixels_alpha (guchar *dest1,
guchar *dest2,
gint width,
gint height,
gint x,
gint y,
guint bpp,
guchar *src1,
guchar *src2)
{
gdouble a = (ABS(x - width) - 1)/ (gdouble) (width - 1);
gdouble b = (ABS(y - height) - 1) / (gdouble) (height - 1);
gdouble w;
gdouble alpha;
guint ai = bpp-1;
guint i;
/* mimic ambiguous point handling in original algorithm */
if (a < 1e-8 && b > 0.99999999)
w = 1.0;
else if (a > 0.99999999 && b < 1e-8)
w = 0.0;
else
w = 1.0 - a*b/(a*b + (1.0 - a)*(1.0 - b));
alpha = w * src1[ai] + (1.0 - w) * src2[ai];
dest1[ai] = dest2[ai] = (guchar) alpha;
if (dest1[ai])
{
for (i = 0; i < ai; i++)
dest1[i] = dest2[i] = (guchar) ((w * src1[i] * src1[ai]
+ (1.0 - w) * src2[i] * src2[ai])
/ alpha);
}
}
static void
tile_region (GimpDrawable *drawable,
gboolean left,
gint x1,
gint y1,
gint x2,
gint y2)
{
glong width, height;
gint bpp;
gint wodd, hodd;
gint w, h, x, y;
gint rgn1_x, rgn2_x, off_x;
static gint progress = 0;
gint max_progress;
GimpPixelRgn src1_rgn, src2_rgn, dest1_rgn, dest2_rgn;
gpointer pr;
gboolean has_alpha;
guint asymmetry_correction;
bpp = gimp_drawable_bpp (drawable->drawable_id);
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
height = y2 - y1;
width = x2 - x1;
wodd = width & 1;
hodd = height & 1;
w = width / 2;
h = height / 2;
if (left)
{
rgn1_x = x1;
rgn2_x = x1 + w + wodd;
off_x = w + wodd;
}
else
{
rgn1_x = x1 + w + wodd;
rgn2_x = x1;
off_x = -w - wodd;
}
asymmetry_correction = !wodd && !left;
gimp_pixel_rgn_init (&src1_rgn, drawable, rgn1_x, y1, w, h, FALSE, FALSE);
gimp_pixel_rgn_init (&dest1_rgn, drawable, rgn1_x, y1, w, h, TRUE, TRUE);
gimp_pixel_rgn_init (&src2_rgn, drawable, rgn2_x, y1 + h + hodd,
w, h, FALSE, FALSE);
gimp_pixel_rgn_init (&dest2_rgn, drawable, rgn2_x, y1 + h + hodd,
w, h, TRUE, TRUE);
max_progress = width * height / 2;
for (pr = gimp_pixel_rgns_register (4, &src1_rgn, &dest1_rgn, &src2_rgn,
&dest2_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
guchar *src1 = src1_rgn.data;
guchar *dest1 = dest1_rgn.data;
guchar *src2 = src2_rgn.data;
guchar *dest2 = dest2_rgn.data;
gint row = src1_rgn.y - y1;
for (y = 0; y < src1_rgn.h; y++, row++)
{
guchar *s1 = src1;
guchar *s2 = src2;
guchar *d1 = dest1;
guchar *d2 = dest2;
gint col = src1_rgn.x - x1;
if (has_alpha)
{
for (x = 0; x < src1_rgn.w; x++, col++)
{
weld_pixels_alpha (d1, d2, w, h, col + asymmetry_correction,
row, bpp, s1, s2);
s1 += bpp;
s2 += bpp;
d1 += bpp;
d2 += bpp;
}
}
else
{
for (x = 0; x < src1_rgn.w; x++, col++)
{
weld_pixels (d1, d2, w, h, col + asymmetry_correction,
row, bpp, s1, s2);
s1 += bpp;
s2 += bpp;
d1 += bpp;
d2 += bpp;
}
}
src1 += src1_rgn.rowstride;
src2 += src2_rgn.rowstride;
dest1 += dest1_rgn.rowstride;
dest2 += dest2_rgn.rowstride;
}
progress += src1_rgn.w * src1_rgn.h;
gimp_progress_update ((gdouble) progress / (gdouble) max_progress);
}
}
static void
copy_region (GimpDrawable *drawable,
gint x,
gint y,
gint w,
gint h)
{
GimpPixelRgn src_rgn, dest_rgn;
gpointer pr;
gimp_pixel_rgn_init (&src_rgn, drawable, x, y, w, h, FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable, x, y, w, h, TRUE, TRUE);
for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
gint k;
for (k = 0; k < src_rgn.h; k++)
{
memcpy (dest_rgn.data + k * dest_rgn.rowstride,
src_rgn.data + k * src_rgn.rowstride,
src_rgn.w * src_rgn.bpp);
}
}
}
static void
tile (GimpDrawable *drawable)
{
glong width, height;
gint x1, y1, x2, y2;
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
gimp_progress_init (_("Tiler"));
height = y2 - y1;
width = x2 - x1;
if (width & 1) /* Copy middle column */
{
copy_region (drawable, x1 + width / 2, y1, 1, height);
}
if (height & 1) /* Copy middle row */
{
copy_region (drawable, x1, y1 + height / 2, width, 1);
}
tile_region (drawable, TRUE, x1, y1, x2, y2);
tile_region (drawable, FALSE, x1, y1, x2, y2);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, width, height);
}
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