mirror of https://github.com/GNOME/gimp.git
300 lines
7.1 KiB
C
300 lines
7.1 KiB
C
/* Color Enhance 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) 1999 Martin Weber
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* Copyright (C) 1996 Federico Mena Quintero
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*
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* You can contact me at martweb@gmx.net
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* This simple plug-in does an automatic Saturation 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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range. For some images it may do just what you want; for others
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it may not work that well. This version operates in HSV space
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and preserves hue. Most code is taken from autostretch_hsv */
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#include "config.h"
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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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#include "libgimp/stdplugins-intl.h"
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static GimpRunMode run_mode;
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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 (const gchar *name,
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gint nparams,
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const GimpParam *param,
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gint *nreturn_vals,
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GimpParam **return_vals);
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static void Color_Enhance (GimpDrawable *drawable);
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static void indexed_Color_Enhance (gint32 image_ID);
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GimpPlugInInfo 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 (void)
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{
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static GimpParamDef args[] =
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{
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{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
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{ GIMP_PDB_IMAGE, "image", "Input image" },
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{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
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};
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gimp_install_procedure ("plug_in_color_enhance",
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"Automatically stretch the saturation of the "
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"specified drawable to cover all possible ranges.",
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"This simple plug-in does an automatic saturation "
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"stretch. For each channel in the image, it finds "
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"the minimum and maximum values... it uses those "
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"values to stretch the individual histograms to the "
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"full range. For some images it may do just what "
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"you want; for others it may not work that well. "
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"This version differs from Contrast Autostretch in "
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"that it works in HSV space, and preserves hue.",
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"Martin Weber",
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"Martin Weber",
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"1997",
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N_("<Image>/Layer/Colors/Auto/_Color Enhance"),
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"RGB*, INDEXED*",
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GIMP_PLUGIN,
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G_N_ELEMENTS (args), 0,
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args, NULL);
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}
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static void
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run (const gchar *name,
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gint nparams,
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const GimpParam *param,
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gint *nreturn_vals,
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GimpParam **return_vals)
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{
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static GimpParam values[1];
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GimpDrawable *drawable;
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GimpPDBStatusType status = GIMP_PDB_SUCCESS;
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gint32 image_ID;
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INIT_I18N();
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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_is_rgb (drawable->drawable_id) ||
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gimp_drawable_is_gray (drawable->drawable_id))
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{
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gimp_progress_init (_("Color Enhance..."));
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gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
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Color_Enhance (drawable);
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if (run_mode != GIMP_RUN_NONINTERACTIVE)
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gimp_displays_flush ();
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}
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else if (gimp_drawable_is_indexed (drawable->drawable_id))
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{
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indexed_Color_Enhance (image_ID);
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if (run_mode != GIMP_RUN_NONINTERACTIVE)
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gimp_displays_flush ();
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}
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else
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{
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status = GIMP_PDB_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 = GIMP_PDB_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 gdouble
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get_v (const guchar *src)
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{
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gdouble h, z, v;
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gint c, m, y;
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gint k;
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guchar map[3];
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c = 255 - src[0];
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m = 255 - src[1];
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y = 255 - src[2];
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k = c;
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if (m < k) k = m;
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if (y < k) k = y;
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map[0] = c - k;
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map[1] = m - k;
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map[2] = y - k;
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gimp_rgb_to_hsv4(map, &h, &z, &v);
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return v;
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}
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static void
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enhance_it (const guchar *src, guchar *dest, gdouble vlo, gdouble vhi)
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{
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gdouble h, z, v;
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gint c, m, y;
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gint k;
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guchar map[3];
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c = 255 - src[0];
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m = 255 - src[1];
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y = 255 - src[2];
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k = c;
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if (m < k) k = m;
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if (y < k) k = y;
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map[0] = c - k;
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map[1] = m - k;
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map[2] = y - k;
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gimp_rgb_to_hsv4(map, &h, &z, &v);
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if (vhi != vlo)
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v = (v - vlo) / (vhi - vlo);
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gimp_hsv_to_rgb4(map, h, z, v);
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c = map[0];
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m = map[1];
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y = map[2];
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c += k;
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if (c > 255) c = 255;
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m += k;
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if (m > 255) m = 255;
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y += k;
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if (y > 255) y = 255;
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dest[0] = 255 - c;
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dest[1] = 255 - m;
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dest[2] = 255 - y;
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}
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static void
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indexed_Color_Enhance (gint32 image_ID)
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{
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guchar *cmap;
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gint ncols,i;
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gdouble vhi = 0.0, vlo = 1.0;
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cmap = gimp_image_get_cmap (image_ID, &ncols);
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if (!cmap)
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{
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printf("Color_Enhance: 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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gdouble v = get_v (&cmap[3 * i]);
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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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enhance_it (&cmap[3 * i], &cmap[3 * i], vlo, vhi);
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}
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gimp_image_set_cmap (image_ID, cmap, ncols);
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}
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typedef struct {
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gdouble vhi;
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gdouble vlo;
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gboolean has_alpha;
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} ColorEnhanceParam_t;
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static void
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find_vhi_vlo (const guchar *src,
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gint bpp,
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gpointer data)
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{
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ColorEnhanceParam_t *param = (ColorEnhanceParam_t*) data;
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if (!param->has_alpha || src[3])
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{
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gdouble v = get_v (src);
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if (v > param->vhi) param->vhi = v;
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if (v < param->vlo) param->vlo = v;
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}
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}
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static void
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color_enhance_func (const guchar *src,
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guchar *dest,
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gint bpp,
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gpointer data)
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{
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ColorEnhanceParam_t *param = (ColorEnhanceParam_t*) data;
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enhance_it (src, dest, param->vlo, param->vhi);
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if (param->has_alpha)
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dest[3] = src[3];
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}
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static void
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Color_Enhance (GimpDrawable *drawable)
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{
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ColorEnhanceParam_t param;
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param.has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
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param.vhi = 0.0;
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param.vlo = 1.0;
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gimp_rgn_iterate1 (drawable, run_mode, find_vhi_vlo, ¶m);
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gimp_rgn_iterate2 (drawable, run_mode, color_enhance_func, ¶m);
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}
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