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- /* The GIMP -- an image manipulation program
- * Copyright (C) 1995 Spencer Kimball and Peter Mattis
- *
- * Gradient Map plug-in
- * Copyright (C) 1997 Eiichi Takamori <taka@ma1.seikyou.ne.jp>
- *
- * 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 1.06
- * This plug-in requires GIMP v0.99.10 or above.
- *
- * This plug-in maps the image using active gradient. (See help_string
- * in query ()).
- *
- * Eiichi Takamori <taka@ma1.seikyou.ne.jp>
- * http://ha1.seikyou.ne.jp/home/taka/gimp/
- *
- * Changes from version 1.05 to version 1.06:
- * - Fixed bug that completely white pixel (= grayscale 255) was not
- * mapped properly. (Thanks to Dov Grobgeld)
- *
- * Changes from version 1.04 to version 1.05:
- * - Now it uses gimp_gradients_sample_uniform () instead of blend
- * tool. Maybe right thing.
- *
- * Changes from revision 1.1 to version 1.04:
- * - Fix bug that it didn't work with alpha channel.
- * - Changed calling `gimp_blend' so that it works in v0.99.9.
- * - Changed calling `gimp_blend' so that it works with Quartic's
- * asupsample patch.
- * - Fix the way to calculate luminosity of RGB image.
- * (Thanks to Michael Lamertz)
- */
-
- #include "config.h"
-
- #include <stdio.h>
- #include <stdlib.h>
-
- #include <libgimp/gimp.h>
-
- #include "libgimp/stdplugins-intl.h"
-
-
- #ifdef RCSID
- static char rcsid[] = "$Id: gradmap.c,v 1.11 2000/08/22 01:26:54 neo Exp $";
- #endif
-
- /* Some useful macros */
-
- #define NSAMPLES 256
- #define TILE_CACHE_SIZE 32
- #define LUMINOSITY(X) (INTENSITY (X[0], X[1], X[2]))
-
- /* Declare a local function.
- */
- static void query (void);
- static void run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals);
-
- static void gradmap (GimpDrawable *drawable);
- static guchar * get_samples (GimpDrawable *drawable );
-
-
- GimpPlugInInfo PLUG_IN_INFO =
- {
- NULL, /* init_proc */
- NULL, /* quit_proc */
- query, /* query_proc */
- run, /* run_proc */
- };
-
- MAIN ()
-
- static void
- query()
- {
- static GimpParamDef args[]=
- {
- { GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
- { GIMP_PDB_IMAGE, "image", "Input image (unused)" },
- { GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
- };
- static gint nargs = sizeof (args) / sizeof (args[0]);
-
- gimp_install_procedure ("plug_in_gradmap",
- "Map the contents of the specified drawable with "
- "active gradient",
- " This plug-in maps the contents of the specified "
- "drawable with active gradient. It calculates "
- "luminosity of each pixel and replaces the pixel "
- "by the sample of active gradient at the position "
- "proportional to that luminosity. Complete black "
- "pixel becomes the leftmost color of the gradient, "
- "and complete white becomes the rightmost. Works on "
- "both Grayscale and RGB image with/without alpha "
- "channel.",
- "Eiichi Takamori",
- "Eiichi Takamori",
- "1997",
- N_("<Image>/Filters/Colors/Map/Gradient Map"),
- "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;
-
- 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;
-
- /* 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->id) ||
- gimp_drawable_is_gray (drawable->id))
- {
- gimp_progress_init ( _("Gradient Map..."));
- gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
-
- gradmap (drawable);
-
- if (run_mode != GIMP_RUN_NONINTERACTIVE)
- gimp_displays_flush ();
- }
- else
- {
- /* g_message ("gradmap: cannot operate on indexed color images"); */
- status = GIMP_PDB_EXECUTION_ERROR;
- }
-
- values[0].data.d_status = status;
-
- gimp_drawable_detach (drawable);
- }
-
- static void
- gradmap (GimpDrawable *drawable)
- {
- GimpPixelRgn src_rgn, dest_rgn;
- gpointer pr;
- guchar *src_row, *dest_row;
- guchar *src, *dest;
- gint progress, max_progress;
- gint x1, y1, x2, y2;
- gint row, col;
- gint bpp, color, has_alpha, alpha;
- guchar *samples, *samp;
- gint lum; /* luminosity */
- gint b;
-
- gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
-
- bpp = alpha = gimp_drawable_bpp( drawable->id );
- color = gimp_drawable_is_rgb( drawable->id );
- has_alpha = gimp_drawable_has_alpha( drawable->id );
- if( has_alpha )
- alpha--;
-
- samples = get_samples (drawable);
-
- 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; row < src_rgn.h; row++ )
- {
- src = src_row;
- dest = dest_row;
-
- for ( col = 0; col < src_rgn.w; col++ )
- {
- if( color )
- {
- lum = LUMINOSITY (src);
- lum = CLAMP (lum, 0, 255); /* to make sure */
- }
- else
- lum = src[0];
-
- samp = &samples[lum * bpp];
- for( b = 0; b < bpp; b++ )
- dest[b] = samp[b];
-
- 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);
- }
-
- g_free (samples);
-
- gimp_drawable_flush (drawable);
- gimp_drawable_merge_shadow (drawable->id, TRUE);
- gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
- }
-
- /*
- Returns 256 samples of active gradient.
- Each sample has (gimp_drawable_bpp (drawable->id)) bytes.
- */
- static guchar *
- get_samples (GimpDrawable *drawable)
- {
- gdouble *f_samples, *f_samp; /* float samples */
- guchar *b_samples, *b_samp; /* byte samples */
- gint bpp, color, has_alpha, alpha;
- gint i, j;
-
- f_samples = gimp_gradients_sample_uniform (NSAMPLES);
-
- bpp = gimp_drawable_bpp (drawable->id);
- color = gimp_drawable_is_rgb (drawable->id);
- has_alpha = gimp_drawable_has_alpha (drawable->id);
- alpha = (has_alpha ? bpp - 1 : bpp);
-
- b_samples = g_new (guchar, NSAMPLES * bpp);
-
- for (i = 0; i < NSAMPLES; i++)
- {
- b_samp = &b_samples[i * bpp];
- f_samp = &f_samples[i * 4];
- if (color)
- for (j = 0; j < 3; j++)
- b_samp[j] = f_samp[j] * 255;
- else
- b_samp[0] = LUMINOSITY (f_samp) * 255;
-
- if (has_alpha)
- b_samp[alpha] = f_samp[3] * 255;
- }
-
- g_free (f_samples);
- return b_samples;
- }
-