mirror of https://github.com/GNOME/gimp.git
435 lines
9.8 KiB
C
435 lines
9.8 KiB
C
/* Autostretch HSV 0.10 --- image filter plug-in for The Gimp image
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* manipulation program
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*
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* Copyright (C) 1997 Scott Goehring
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* Copyright (C) 1996 Federico Mena Quintero
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*
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* You can contact me at scott@poverty.bloomington.in.us
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* You can contact the original The Gimp authors at gimp@xcf.berkeley.edu
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* This simple plug-in does an automatic contrast stretch. For each
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channel in the image, it finds the minimum and maximum values... it
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uses those values to stretch the individual histograms to the full
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contrast range. For some images it may do just what you want; for
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others it may be total crap :) This version operates in HSV space
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and preserves hue, unlike the original Contrast Autostretch. */
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#include <stdlib.h>
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#include <stdio.h>
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#include "libgimp/gimp.h"
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/* Declare local functions.
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*/
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static void query (void);
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static void run (char *name,
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int nparams,
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GParam *param,
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int *nreturn_vals,
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GParam **return_vals);
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static void autostretch_hsv (GDrawable * drawable);
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static void indexed_autostretch_hsv (gint32 image_ID);
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static void calc_rgb_to_hsv(guchar *rgb, double *h, double *s, double *v);
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static void calc_hsv_to_rgb(guchar *rgb, double h, double s, double v);
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GPlugInInfo PLUG_IN_INFO =
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{
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NULL, /* init_proc */
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NULL, /* quit_proc */
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query, /* query_proc */
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run, /* run_proc */
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};
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MAIN ()
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static void
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query ()
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{
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static GParamDef args[] =
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{
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{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
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{ PARAM_IMAGE, "image", "Input image" },
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{ PARAM_DRAWABLE, "drawable", "Input drawable" },
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};
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static GParamDef *return_vals = NULL;
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static int nargs = sizeof (args) / sizeof (args[0]);
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static int nreturn_vals = 0;
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gimp_install_procedure ("plug_in_autostretch_hsv",
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"Automatically stretch the contrast of the specified drawable to cover all possible ranges.",
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"This simple plug-in does an automatic contrast stretch. For each channel in the image, it finds the minimum and maximum values... it uses those values to stretch the individual histograms to the full contrast range. For some images it may do just what you want; for others it may be total crap :). This version differs from Contrast Autostretch in that it works in HSV space, and preserves hue.",
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"Scott Goehring and Federico Mena Quintero",
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"Scott Goehring and Federico Mena Quintero",
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"1997",
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"<Image>/Filters/Image/Auto-Stretch HSV",
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"RGB*, INDEXED*",
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PROC_PLUG_IN,
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nargs, nreturn_vals,
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args, return_vals);
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}
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static void
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run (char *name,
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int nparams,
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GParam *param,
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int *nreturn_vals,
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GParam **return_vals)
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{
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static GParam values[1];
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GDrawable *drawable;
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GRunModeType run_mode;
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GStatusType status = STATUS_SUCCESS;
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gint32 image_ID;
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run_mode = param[0].data.d_int32;
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/* Get the specified drawable */
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drawable = gimp_drawable_get (param[2].data.d_drawable);
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image_ID = param[1].data.d_image;
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/* Make sure that the drawable is gray or RGB color */
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if (gimp_drawable_color (drawable->id) || gimp_drawable_gray (drawable->id))
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{
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gimp_progress_init ("Auto-Stretching Contrast...");
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gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
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autostretch_hsv (drawable);
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if (run_mode != RUN_NONINTERACTIVE)
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gimp_displays_flush ();
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}
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else if (gimp_drawable_indexed (drawable->id))
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{
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indexed_autostretch_hsv (image_ID);
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/* GIMP doesn't implicitly update an image whose cmap has
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changed - it probably should. */
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gimp_drawable_update (drawable->id, 0, 0,
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gimp_drawable_width(drawable->id),
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gimp_drawable_height(drawable->id));
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gimp_displays_flush ();
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}
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else
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{
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/* gimp_message ("autostretch_hsv: cannot operate on indexed color images"); */
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status = STATUS_EXECUTION_ERROR;
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}
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*nreturn_vals = 1;
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*return_vals = values;
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values[0].type = PARAM_STATUS;
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values[0].data.d_status = status;
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gimp_drawable_detach (drawable);
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}
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static void
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indexed_autostretch_hsv(gint32 image_ID) /* a.d.m. */
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{
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guchar *cmap;
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gint ncols,i;
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double shi = 0.0, vhi = 0.0, slo = 1.0, vlo = 1.0;
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cmap = gimp_image_get_cmap (image_ID, &ncols);
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if (cmap==NULL)
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{
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printf("autostretch_hsv: cmap was NULL! Quitting...\n");
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gimp_quit();
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}
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for (i=0;i<ncols;i++)
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{
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double h, s, v;
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calc_rgb_to_hsv(&cmap[i*3], &h, &s, &v);
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if (s > shi) shi = s;
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if (s < slo) slo = s;
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if (v > vhi) vhi = v;
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if (v < vlo) vlo = v;
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}
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for (i=0;i<ncols;i++)
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{
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double h, s, v;
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calc_rgb_to_hsv(&cmap[i*3], &h, &s, &v);
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if (shi!=slo)
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s = (s-slo) / (shi-slo);
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if (vhi!=vlo)
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v = (v-vlo) / (vhi-vlo);
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calc_hsv_to_rgb(&cmap[i*3], h, s, v);
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}
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gimp_image_set_cmap (image_ID, cmap, ncols);
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}
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static void
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autostretch_hsv (GDrawable *drawable)
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{
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GPixelRgn src_rgn, dest_rgn;
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guchar *src, *s;
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guchar *dest, *d;
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double shi = 0.0, slo = 1.0, vhi = 0.0, vlo = 1.0;
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gint progress, max_progress;
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gint has_alpha, alpha;
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gint x1, y1, x2, y2;
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gint x, y;
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gpointer pr;
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/* Get selection area */
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gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
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has_alpha = gimp_drawable_has_alpha (drawable->id);
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alpha = (has_alpha) ? drawable->bpp - 1 : drawable->bpp;
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/* Initialize progress */
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progress = 0;
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max_progress = (x2 - x1) * (y2 - y1) * 2;
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gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
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for (pr = gimp_pixel_rgns_register (1, &src_rgn); pr != NULL; pr = gimp_pixel_rgns_process (pr))
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{
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src = src_rgn.data;
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for (y = 0; y < src_rgn.h; y++)
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{
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s = src;
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for (x = 0; x < src_rgn.w; x++)
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{
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if (!has_alpha || (has_alpha && s[alpha]))
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{
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double h, z, v;
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calc_rgb_to_hsv(s, &h, &z, &v);
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if (z > shi) shi = z;
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if (z < slo) slo = z;
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if (v > vhi) vhi = v;
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if (v < vlo) vlo = v;
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}
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s += src_rgn.bpp;
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}
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src += src_rgn.rowstride;
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}
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/* Update progress */
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progress += src_rgn.w * src_rgn.h;
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gimp_progress_update ((double) progress / (double) max_progress);
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}
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/* Now substitute pixel vales */
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gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
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gimp_pixel_rgn_init (&dest_rgn, drawable, x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
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for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn); pr != NULL; pr = gimp_pixel_rgns_process (pr))
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{
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src = src_rgn.data;
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dest = dest_rgn.data;
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for (y = 0; y < src_rgn.h; y++)
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{
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s = src;
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d = dest;
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for (x = 0; x < src_rgn.w; x++)
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{
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double h, z, v;
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calc_rgb_to_hsv(s, &h, &z, &v);
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if (shi!=slo)
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z = (z-slo) / (shi-slo);
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if (vhi!=vlo)
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v = (v-vlo) / (vhi-vlo);
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calc_hsv_to_rgb(d, h, z, v);
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if (has_alpha)
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d[alpha] = s[alpha];
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s += src_rgn.bpp;
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d += dest_rgn.bpp;
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}
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src += src_rgn.rowstride;
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dest += dest_rgn.rowstride;
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}
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/* Update progress */
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progress += src_rgn.w * src_rgn.h;
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gimp_progress_update ((double) progress / (double) max_progress);
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}
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/* update the region */
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gimp_drawable_flush (drawable);
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gimp_drawable_merge_shadow (drawable->id, TRUE);
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gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
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}
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static void
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calc_rgb_to_hsv(guchar *rgb, double *hue, double *sat, double *val)
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{
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double red, green, blue;
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double h, s, v;
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double min, max;
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double delta;
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red = rgb[0] / 255.0;
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green = rgb[1] / 255.0;
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blue = rgb[2] / 255.0;
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h = 0.0; /* Shut up -Wall */
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if (red > green)
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{
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if (red > blue)
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max = red;
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else
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max = blue;
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if (green < blue)
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min = green;
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else
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min = blue;
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}
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else
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{
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if (green > blue)
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max = green;
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else
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max = blue;
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if (red < blue)
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min = red;
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else
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min = blue;
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}
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v = max;
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if (max != 0.0)
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s = (max - min) / max;
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else
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s = 0.0;
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if (s == 0.0)
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h = 0.0;
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else
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{
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delta = max - min;
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if (red == max)
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h = (green - blue) / delta;
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else if (green == max)
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h = 2 + (blue - red) / delta;
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else if (blue == max)
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h = 4 + (red - green) / delta;
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h /= 6.0;
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if (h < 0.0)
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h += 1.0;
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else if (h > 1.0)
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h -= 1.0;
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}
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*hue = h;
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*sat = s;
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*val = v;
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}
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static void
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calc_hsv_to_rgb(guchar *rgb, double h, double s, double v)
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{
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double hue, saturation, value;
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double f, p, q, t;
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if (s == 0.0)
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{
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h = v;
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s = v;
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v = v; /* heh */
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}
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else
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{
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hue = h * 6.0;
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saturation = s;
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value = v;
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if (hue == 6.0)
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hue = 0.0;
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f = hue - (int) hue;
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p = value * (1.0 - saturation);
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q = value * (1.0 - saturation * f);
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t = value * (1.0 - saturation * (1.0 - f));
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switch ((int) hue)
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{
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case 0:
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h = value;
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s = t;
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v = p;
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break;
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case 1:
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h = q;
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s = value;
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v = p;
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break;
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case 2:
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h = p;
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s = value;
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v = t;
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break;
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case 3:
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h = p;
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s = q;
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v = value;
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break;
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case 4:
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h = t;
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s = p;
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v = value;
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break;
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case 5:
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h = value;
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s = p;
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v = q;
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break;
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}
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}
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rgb[0] = h*255;
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rgb[1] = s*255;
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rgb[2] = v*255;
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}
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