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5dd23ae18b
2007-11-02 Michael Natterer <mitch@gimp.org> * app/core/Makefile.am * app/core/core-types.h * app/core/gimpcurve-save.[ch] * app/core/gimpcurve-load.[ch] * app/core/gimpcurve.[ch]: new GimpData subclass which keeps a curve as known from the curves tool. Pretty much unfinished, but can do everything that used to be done by base/curves.c and more. * app/base/curves.[ch]: stripped down to plain arrays of uchar (the actual curve) and the LUT setup function. All the rest is done by GimpCurve now. * app/tools/gimpcurvestool.[ch]: use an array of GimpCurves instead of the old Curves cruft. Use Curves only for the last step of creating the LUT. Pretty much unfinished migration here too. * tools/pdbgen/pdb/color.pdb: use a GimpCurve here too. * app/pdb/color_cmds.c: regenerated. svn path=/trunk/; revision=24041
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/* GIMP - The GNU 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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#include "config.h"
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#include <glib-object.h>
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#include "libgimpmath/gimpmath.h"
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#include "libgimpbase/gimpbase.h"
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#include "base-types.h"
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#include "curves.h"
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#include "gimplut.h"
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/* public functions */
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void
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curves_init (Curves *curves)
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{
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GimpHistogramChannel channel;
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g_return_if_fail (curves != NULL);
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for (channel = GIMP_HISTOGRAM_VALUE;
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channel <= GIMP_HISTOGRAM_ALPHA;
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channel++)
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{
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gint j;
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for (j = 0; j < 256; j++)
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curves->curve[channel][j] = j;
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}
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}
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gfloat
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curves_lut_func (Curves *curves,
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gint n_channels,
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gint channel,
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gfloat value)
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{
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gfloat f;
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gint index;
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gdouble inten;
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gint j;
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if (n_channels <= 2)
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j = channel;
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else
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j = channel + 1;
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inten = value;
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/* For RGB and RGBA images this runs through the loop with j = channel + 1
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* the first time and j = 0 the second time
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*
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* For GRAY images this runs through the loop with j = 0 the first and
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* only time
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*/
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for (; j >= 0; j -= (channel + 1))
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{
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/* don't apply the overall curve to the alpha channel */
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if (j == 0 && (n_channels == 2 || n_channels == 4) &&
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channel == n_channels - 1)
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return inten;
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if (inten < 0.0)
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{
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inten = curves->curve[j][0]/255.0;
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}
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else if (inten >= 1.0)
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{
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inten = curves->curve[j][255]/255.0;
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}
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else /* interpolate the curve */
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{
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index = floor (inten * 255.0);
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f = inten * 255.0 - index;
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inten = ((1.0 - f) * curves->curve[j][index ] +
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f * curves->curve[j][index + 1] ) / 255.0;
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}
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}
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return inten;
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}
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