mirror of https://github.com/GNOME/gimp.git
228 lines
6.0 KiB
C
228 lines
6.0 KiB
C
/* 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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#include "config.h"
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#include <glib-object.h>
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpmath/gimpmath.h"
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#include "base-types.h"
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#include "color-balance.h"
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#include "pixel-region.h"
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/* local function prototypes */
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static void color_balance_transfer_init (void);
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/* private variables */
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static gboolean transfer_initialized = FALSE;
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/* for lightening */
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static gdouble highlights_add[256] = { 0 };
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static gdouble midtones_add[256] = { 0 };
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static gdouble shadows_add[256] = { 0 };
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/* for darkening */
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static gdouble highlights_sub[256] = { 0 };
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static gdouble midtones_sub[256] = { 0 };
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static gdouble shadows_sub[256] = { 0 };
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/* public functions */
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void
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color_balance_init (ColorBalance *cb)
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{
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GimpTransferMode range;
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g_return_if_fail (cb != NULL);
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for (range = GIMP_SHADOWS; range <= GIMP_HIGHLIGHTS; range++)
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color_balance_range_reset (cb, range);
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cb->preserve_luminosity = TRUE;
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}
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void
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color_balance_range_reset (ColorBalance *cb,
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GimpTransferMode range)
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{
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g_return_if_fail (cb != NULL);
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cb->cyan_red[range] = 0.0;
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cb->magenta_green[range] = 0.0;
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cb->yellow_blue[range] = 0.0;
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}
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void
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color_balance_create_lookup_tables (ColorBalance *cb)
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{
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gdouble *cyan_red_transfer[3];
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gdouble *magenta_green_transfer[3];
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gdouble *yellow_blue_transfer[3];
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gint i;
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gint32 r_n, g_n, b_n;
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g_return_if_fail (cb != NULL);
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if (! transfer_initialized)
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{
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color_balance_transfer_init ();
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transfer_initialized = TRUE;
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}
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/* Set the transfer arrays (for speed) */
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cyan_red_transfer[GIMP_SHADOWS] =
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(cb->cyan_red[GIMP_SHADOWS] > 0) ? shadows_add : shadows_sub;
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cyan_red_transfer[GIMP_MIDTONES] =
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(cb->cyan_red[GIMP_MIDTONES] > 0) ? midtones_add : midtones_sub;
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cyan_red_transfer[GIMP_HIGHLIGHTS] =
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(cb->cyan_red[GIMP_HIGHLIGHTS] > 0) ? highlights_add : highlights_sub;
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magenta_green_transfer[GIMP_SHADOWS] =
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(cb->magenta_green[GIMP_SHADOWS] > 0) ? shadows_add : shadows_sub;
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magenta_green_transfer[GIMP_MIDTONES] =
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(cb->magenta_green[GIMP_MIDTONES] > 0) ? midtones_add : midtones_sub;
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magenta_green_transfer[GIMP_HIGHLIGHTS] =
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(cb->magenta_green[GIMP_HIGHLIGHTS] > 0) ? highlights_add : highlights_sub;
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yellow_blue_transfer[GIMP_SHADOWS] =
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(cb->yellow_blue[GIMP_SHADOWS] > 0) ? shadows_add : shadows_sub;
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yellow_blue_transfer[GIMP_MIDTONES] =
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(cb->yellow_blue[GIMP_MIDTONES] > 0) ? midtones_add : midtones_sub;
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yellow_blue_transfer[GIMP_HIGHLIGHTS] =
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(cb->yellow_blue[GIMP_HIGHLIGHTS] > 0) ? highlights_add : highlights_sub;
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for (i = 0; i < 256; i++)
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{
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r_n = i;
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g_n = i;
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b_n = i;
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r_n += cb->cyan_red[GIMP_SHADOWS] * cyan_red_transfer[GIMP_SHADOWS][r_n];
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r_n = CLAMP0255 (r_n);
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r_n += cb->cyan_red[GIMP_MIDTONES] * cyan_red_transfer[GIMP_MIDTONES][r_n];
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r_n = CLAMP0255 (r_n);
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r_n += cb->cyan_red[GIMP_HIGHLIGHTS] * cyan_red_transfer[GIMP_HIGHLIGHTS][r_n];
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r_n = CLAMP0255 (r_n);
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g_n += cb->magenta_green[GIMP_SHADOWS] * magenta_green_transfer[GIMP_SHADOWS][g_n];
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g_n = CLAMP0255 (g_n);
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g_n += cb->magenta_green[GIMP_MIDTONES] * magenta_green_transfer[GIMP_MIDTONES][g_n];
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g_n = CLAMP0255 (g_n);
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g_n += cb->magenta_green[GIMP_HIGHLIGHTS] * magenta_green_transfer[GIMP_HIGHLIGHTS][g_n];
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g_n = CLAMP0255 (g_n);
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b_n += cb->yellow_blue[GIMP_SHADOWS] * yellow_blue_transfer[GIMP_SHADOWS][b_n];
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b_n = CLAMP0255 (b_n);
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b_n += cb->yellow_blue[GIMP_MIDTONES] * yellow_blue_transfer[GIMP_MIDTONES][b_n];
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b_n = CLAMP0255 (b_n);
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b_n += cb->yellow_blue[GIMP_HIGHLIGHTS] * yellow_blue_transfer[GIMP_HIGHLIGHTS][b_n];
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b_n = CLAMP0255 (b_n);
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cb->r_lookup[i] = r_n;
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cb->g_lookup[i] = g_n;
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cb->b_lookup[i] = b_n;
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}
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}
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void
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color_balance (PixelRegion *srcPR,
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PixelRegion *destPR,
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gpointer data)
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{
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ColorBalance *cb;
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guchar *src, *s;
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guchar *dest, *d;
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gboolean alpha;
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gint r, g, b;
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gint r_n, g_n, b_n;
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gint w, h;
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cb = (ColorBalance *) data;
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h = srcPR->h;
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src = srcPR->data;
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dest = destPR->data;
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alpha = (srcPR->bytes == 4) ? TRUE : FALSE;
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while (h--)
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{
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w = srcPR->w;
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s = src;
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d = dest;
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while (w--)
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{
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r = s[RED_PIX];
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g = s[GREEN_PIX];
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b = s[BLUE_PIX];
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r_n = cb->r_lookup[r];
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g_n = cb->g_lookup[g];
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b_n = cb->b_lookup[b];
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if (cb->preserve_luminosity)
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{
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gimp_rgb_to_hls_int (&r_n, &g_n, &b_n);
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g_n = gimp_rgb_to_l_int (r, g, b);
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gimp_hls_to_rgb_int (&r_n, &g_n, &b_n);
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}
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d[RED_PIX] = r_n;
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d[GREEN_PIX] = g_n;
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d[BLUE_PIX] = b_n;
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if (alpha)
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d[ALPHA_PIX] = s[ALPHA_PIX];
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s += srcPR->bytes;
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d += destPR->bytes;
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}
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src += srcPR->rowstride;
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dest += destPR->rowstride;
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}
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}
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/* private functions */
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static void
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color_balance_transfer_init (void)
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{
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gint i;
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for (i = 0; i < 256; i++)
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{
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highlights_add[i] =
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shadows_sub[255 - i] = (1.075 - 1 / ((gdouble) i / 16.0 + 1));
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midtones_add[i] =
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midtones_sub[i] = 0.667 * (1 - SQR (((gdouble) i - 127.0) / 127.0));
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shadows_add[i] =
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highlights_sub[i] = 0.667 * (1 - SQR (((gdouble) i - 127.0) / 127.0));
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}
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}
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