mirror of https://github.com/GNOME/gimp.git
282 lines
6.9 KiB
C
282 lines
6.9 KiB
C
/*
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* Value-Invert plug-in v1.1 by Adam D. Moss, adam@foxbox.org. 1999/02/27
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*/
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/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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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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/*
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* BUGS:
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* Is not undoable when operating on indexed images - GIMP's fault.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <libgimp/gimp.h>
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#include "libgimp/stdplugins-intl.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 (gchar *name,
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gint nparams,
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GimpParam *param,
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gint *nreturn_vals,
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GimpParam **return_vals);
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static void vinvert (GimpDrawable *drawable);
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static void indexed_vinvert (gint32 image_ID);
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static void vinvert_render_row (const guchar *src_row,
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guchar *dest_row,
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gint row_width,
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const gint bytes);
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static GimpRunModeType run_mode;
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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 ()
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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 (used for indexed images)" },
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{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
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};
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static gint nargs = sizeof (args) / sizeof (args[0]);
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gimp_install_procedure ("plug_in_vinvert",
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"Invert the 'value' component of an indexed/RGB image in HSV colorspace",
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"This function takes an indexed/RGB image and "
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"inverts its 'value' in HSV space. The upshot of "
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"this is that the color and saturation at any given "
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"point remains the same, but its brightness is "
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"effectively inverted. Quite strange. Sometimes "
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"produces unpleasant color artifacts on images from "
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"lossy sources (ie. JPEG).",
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"Adam D. Moss (adam@foxbox.org)",
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"Adam D. Moss (adam@foxbox.org)",
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"27th March 1997",
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N_("<Image>/Filters/Colors/Value Invert"),
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"RGB*, INDEXED*",
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GIMP_PLUGIN,
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nargs, 0,
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args, NULL);
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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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GimpParam *param,
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int *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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gint32 image_ID;
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GimpPDBStatusType status = GIMP_PDB_SUCCESS;
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run_mode = param[0].data.d_int32;
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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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/* 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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if (status == GIMP_PDB_SUCCESS)
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{
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/* Make sure that the drawable is indexed or RGB color */
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if (gimp_drawable_is_rgb (drawable->id))
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{
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if (run_mode != GIMP_RUN_NONINTERACTIVE)
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{
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INIT_I18N();
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gimp_progress_init ("Value Invert...");
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}
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vinvert (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
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if (gimp_drawable_is_indexed (drawable->id))
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{
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indexed_vinvert (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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}
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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_vinvert (gint32 image_ID)
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{
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guchar *cmap;
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gint ncols;
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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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g_print ("vinvert: cmap was NULL! Quitting...\n");
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gimp_quit ();
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}
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vinvert_render_row (cmap,
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cmap,
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ncols,
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3);
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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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vinvert_render_row (const guchar *src_data,
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guchar *dest_data,
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gint col, /* row width in pixels */
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const gint bytes)
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{
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while (col--)
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{
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gint v1, v2, v3;
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v1 = src_data[col*bytes ];
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v2 = src_data[col*bytes +1];
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v3 = src_data[col*bytes +2];
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gimp_rgb_to_hsv_int (&v1, &v2, &v3);
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v3 = 255-v3;
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gimp_hsv_to_rgb_int (&v1, &v2, &v3);
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dest_data[col*bytes ] = v1;
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dest_data[col*bytes +1] = v2;
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dest_data[col*bytes +2] = v3;
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if (bytes>3)
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{
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gint bytenum;
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for (bytenum = 3; bytenum<bytes; bytenum++)
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{
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dest_data[col*bytes+bytenum] =
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src_data[col*bytes+bytenum];
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}
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}
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}
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}
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static void
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vinvert_render_region (const GimpPixelRgn srcPR,
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const GimpPixelRgn destPR)
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{
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gint row;
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guchar* src_ptr = srcPR.data;
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guchar* dest_ptr = destPR.data;
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for (row = 0; row < srcPR.h ; row++)
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{
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vinvert_render_row (src_ptr, dest_ptr,
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srcPR.w,
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srcPR.bpp);
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src_ptr += srcPR.rowstride;
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dest_ptr += destPR.rowstride;
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}
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}
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static void
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vinvert (GimpDrawable *drawable)
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{
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GimpPixelRgn srcPR, destPR;
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gint x1, y1, x2, y2;
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gpointer pr;
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gint total_area, area_so_far;
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gint progress_skip;
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/* Get the input area. This is the bounding box of the selection in
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* the image (or the entire image if there is no selection). Only
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* operating on the input area is simply an optimization. It doesn't
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* need to be done for correct operation. (It simply makes it go
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* faster, since fewer pixels need to be operated on).
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*/
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gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
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total_area = (x2 - x1) * (y2 - y1);
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area_so_far = 0;
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progress_skip = 0;
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/* Initialize the pixel regions. */
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gimp_pixel_rgn_init (&srcPR, drawable, x1, y1, (x2 - x1), (y2 - y1),
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FALSE, FALSE);
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gimp_pixel_rgn_init (&destPR, drawable, x1, y1, (x2 - x1), (y2 - y1),
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TRUE, TRUE);
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for (pr = gimp_pixel_rgns_register (2, &srcPR, &destPR);
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pr != NULL;
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pr = gimp_pixel_rgns_process (pr))
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{
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vinvert_render_region (srcPR, destPR);
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if ((run_mode != GIMP_RUN_NONINTERACTIVE))
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{
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area_so_far += srcPR.w * srcPR.h;
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if (((progress_skip++)%10) == 0)
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gimp_progress_update ((double) area_so_far / (double) total_area);
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}
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}
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/* update the processed 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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