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- /* Normalize 1.00 --- image filter plug-in for The GIMP
- *
- * Copyright (C) 1997 Adam D. Moss (adam@foxbox.org)
- * Very largely based on Quartic's "Contrast Autostretch"
- *
- * 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.
- */
-
-
- /* This plugin performs almost the same operation as the 'contrast
- * autostretch' plugin, except that it won't allow the colour channels
- * to normalize independently. This is actually what most people probably
- * want instead of contrast-autostretch; use c-a only if you wish to remove
- * an undesirable colour-tint from a source image which is supposed to
- * contain pure-white and pure-black.
- */
-
- #include "config.h"
-
- #include <stdlib.h>
- #include <stdio.h>
-
- #include <libgimp/gimp.h>
-
- #include "libgimp/stdplugins-intl.h"
-
-
- /* Declare local functions.
- */
- static void query (void);
- static void run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals);
-
- static void norma (GimpDrawable *drawable);
- static void indexed_norma (gint32 image_ID);
-
-
- GimpPlugInInfo PLUG_IN_INFO =
- {
- NULL, /* init_proc */
- NULL, /* quit_proc */
- query, /* query_proc */
- run, /* run_proc */
- };
-
-
- MAIN ()
-
- static void
- query (void)
- {
- static GimpParamDef args[] =
- {
- { GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
- { GIMP_PDB_IMAGE, "image", "Input image" },
- { GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
- };
- static gint nargs = sizeof (args) / sizeof (args[0]);
-
- gimp_install_procedure ("plug_in_normalize",
- "Normalize the contrast of the specified drawable to "
- "cover all possible ranges.",
- "This plugin performs almost the same operation as "
- "the 'contrast autostretch' plugin, except that it "
- "won't allow the color channels to normalize "
- "independently. This is actually what most people "
- "probably want instead of contrast-autostretch; use "
- "c-a only if you wish to remove an undesirable "
- "color-tint from a source image which is supposed to "
- "contain pure-white and pure-black.",
- "Adam D. Moss, Federico Mena Quintero",
- "Adam D. Moss, Federico Mena Quintero",
- "1997",
- N_("<Image>/Image/Colors/Auto/Normalize"),
- "RGB*, GRAY*, INDEXED*",
- 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;
-
- gint32 image_ID;
-
- INIT_I18N();
-
- run_mode = param[0].data.d_int32;
-
- /* Get the specified drawable */
- drawable = gimp_drawable_get (param[2].data.d_drawable);
- image_ID = param[1].data.d_image;
-
- /* 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 (_("Normalizing..."));
- gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
- norma (drawable);
-
- if (run_mode != GIMP_RUN_NONINTERACTIVE)
- gimp_displays_flush ();
- }
- else if (gimp_drawable_is_indexed (drawable->id))
- {
- indexed_norma (image_ID);
- if (run_mode != GIMP_RUN_NONINTERACTIVE)
- gimp_displays_flush ();
- }
- else
- {
- /* gimp_message ("normalize: cannot operate on indexed color images"); */
- 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
- indexed_norma (gint32 image_ID) /* a.d.m. */
- {
- guchar *cmap;
- gint ncols,i;
- gint hi=0,lo=255;
-
- cmap = gimp_image_get_cmap (image_ID, &ncols);
-
- if (cmap==NULL)
- {
- printf ("normalize: cmap was NULL! Quitting...\n");
- return;
- }
-
- for (i=0;i<ncols;i++)
- {
- if (cmap[i*3 +0] > hi) hi=cmap[i*3 +0];
- if (cmap[i*3 +1] > hi) hi=cmap[i*3 +1];
- if (cmap[i*3 +2] > hi) hi=cmap[i*3 +2];
- if (cmap[i*3 +0] < lo) lo=cmap[i*3 +0];
- if (cmap[i*3 +1] < lo) lo=cmap[i*3 +1];
- if (cmap[i*3 +2] < lo) lo=cmap[i*3 +2];
- }
-
- if (hi!=lo)
- for (i=0;i<ncols;i++)
- {
- cmap[i*3 +0] = (255 * (cmap[i*3 +0] - lo)) / (hi-lo);
- cmap[i*3 +1] = (255 * (cmap[i*3 +1] - lo)) / (hi-lo);
- cmap[i*3 +2] = (255 * (cmap[i*3 +2] - lo)) / (hi-lo);
- }
-
- gimp_image_set_cmap (image_ID, cmap, ncols);
- }
-
-
- static void
- norma (GimpDrawable *drawable)
- {
- GimpPixelRgn src_rgn, dest_rgn;
- guchar *src, *s;
- guchar *dest, *d;
- guchar min, max;
- guchar range;
- guchar lut[256];
- gint progress, max_progress;
- gint has_alpha, alpha;
- gint x1, y1, x2, y2;
- gint x, y, b;
- gpointer pr;
-
- /* Get selection area */
- gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
- has_alpha = gimp_drawable_has_alpha (drawable->id);
- alpha = (has_alpha) ? drawable->bpp - 1 : drawable->bpp;
-
- /* Initialize progress */
- progress = 0;
- max_progress = (x2 - x1) * (y2 - y1) * 2;
-
- /* Get minimum and maximum values for each channel */
- min = 255;
- max = 0;
-
- gimp_pixel_rgn_init (&src_rgn, drawable,
- x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
-
- for (pr = gimp_pixel_rgns_register (1, &src_rgn);
- pr != NULL;
- pr = gimp_pixel_rgns_process (pr))
- {
- src = src_rgn.data;
-
- for (y = 0; y < src_rgn.h; y++)
- {
- s = src;
- for (x = 0; x < src_rgn.w; x++)
- {
- for (b = 0; b < alpha; b++)
- {
- if (!has_alpha || (has_alpha && s[alpha]))
- {
- if (s[b] < min)
- min = s[b];
- if (s[b] > max)
- max = s[b];
- }
- }
-
- s += src_rgn.bpp;
- }
-
- src += src_rgn.rowstride;
- }
-
- /* Update progress */
- progress += src_rgn.w * src_rgn.h;
-
- gimp_progress_update ((double) progress / (double) max_progress);
- }
-
- /* Calculate LUT */
-
- range = max - min;
-
- if (range != 0)
- for (x = min; x <= max; x++)
- lut[x] = 255 * (x - min) / range;
- else
- lut[min] = min;
-
-
- /* Now substitute pixel vales */
- 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);
-
- for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
- pr != NULL;
- pr = gimp_pixel_rgns_process (pr))
- {
- src = src_rgn.data;
- dest = dest_rgn.data;
-
- for (y = 0; y < src_rgn.h; y++)
- {
- s = src;
- d = dest;
-
- for (x = 0; x < src_rgn.w; x++)
- {
- for (b = 0; b < alpha; b++)
- d[b] = lut[s[b]];
-
- if (has_alpha)
- d[alpha] = s[alpha];
-
- s += src_rgn.bpp;
- d += dest_rgn.bpp;
- }
-
- src += src_rgn.rowstride;
- dest += dest_rgn.rowstride;
-
- }
-
- /* Update progress */
- progress += src_rgn.w * src_rgn.h;
-
- gimp_progress_update ((double) progress / (double) max_progress);
- }
-
- /* update the region */
- gimp_drawable_flush (drawable);
- gimp_drawable_merge_shadow (drawable->id, TRUE);
- gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
- }
-