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gimp/app/color_balance.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "appenv.h"
#include "actionarea.h"
#include "color_balance.h"
#include "color_transfer.h"
#include "drawable.h"
#include "general.h"
#include "gimage_mask.h"
#include "gdisplay.h"
#include "image_map.h"
#include "interface.h"
#include "libgimp/gimpintl.h"
#define TEXT_WIDTH 55
#define SHADOWS 0
#define MIDTONES 1
#define HIGHLIGHTS 2
#define CR_SLIDER 0x1
#define MG_SLIDER 0x2
#define YB_SLIDER 0x4
#define CR_TEXT 0x8
#define MG_TEXT 0x10
#define YB_TEXT 0x20
#define ALL 0xFF
typedef struct _ColorBalance ColorBalance;
struct _ColorBalance
{
int x, y; /* coords for last mouse click */
};
typedef struct _ColorBalanceDialog ColorBalanceDialog;
struct _ColorBalanceDialog
{
GtkWidget *shell;
GtkWidget *cyan_red_text;
GtkWidget *magenta_green_text;
GtkWidget *yellow_blue_text;
GtkAdjustment *cyan_red_data;
GtkAdjustment *magenta_green_data;
GtkAdjustment *yellow_blue_data;
GimpDrawable *drawable;
ImageMap image_map;
double cyan_red[3];
double magenta_green[3];
double yellow_blue[3];
gint preserve_luminosity;
gint preview;
gint application_mode;
};
/* color balance action functions */
static void color_balance_button_press (Tool *, GdkEventButton *, gpointer);
static void color_balance_button_release (Tool *, GdkEventButton *, gpointer);
static void color_balance_motion (Tool *, GdkEventMotion *, gpointer);
static void color_balance_cursor_update (Tool *, GdkEventMotion *, gpointer);
static void color_balance_control (Tool *, int, gpointer);
static ColorBalanceDialog * color_balance_new_dialog (void);
static void color_balance_update (ColorBalanceDialog *, int);
static void color_balance_preview (ColorBalanceDialog *);
static void color_balance_ok_callback (GtkWidget *, gpointer);
static void color_balance_cancel_callback (GtkWidget *, gpointer);
static gint color_balance_delete_callback (GtkWidget *, GdkEvent *, gpointer);
static void color_balance_shadows_callback (GtkWidget *, gpointer);
static void color_balance_midtones_callback (GtkWidget *, gpointer);
static void color_balance_highlights_callback (GtkWidget *, gpointer);
static void color_balance_preserve_update (GtkWidget *, gpointer);
static void color_balance_preview_update (GtkWidget *, gpointer);
static void color_balance_cr_scale_update (GtkAdjustment *, gpointer);
static void color_balance_mg_scale_update (GtkAdjustment *, gpointer);
static void color_balance_yb_scale_update (GtkAdjustment *, gpointer);
static void color_balance_cr_text_update (GtkWidget *, gpointer);
static void color_balance_mg_text_update (GtkWidget *, gpointer);
static void color_balance_yb_text_update (GtkWidget *, gpointer);
static void *color_balance_options = NULL;
static ColorBalanceDialog *color_balance_dialog = NULL;
static void color_balance (PixelRegion *, PixelRegion *, void *);
static Argument * color_balance_invoker (Argument *);
/* color balance machinery */
static void
color_balance (PixelRegion *srcPR,
PixelRegion *destPR,
void *user_data)
{
ColorBalanceDialog *cbd;
unsigned char *src, *s;
unsigned char *dest, *d;
int alpha;
int r, g, b;
int r_n, g_n, b_n;
int w, h;
double *cyan_red_transfer[3];
double *magenta_green_transfer[3];
double *yellow_blue_transfer[3];
cbd = (ColorBalanceDialog *) user_data;
/* Set the transfer arrays (for speed) */
cyan_red_transfer[SHADOWS] = (cbd->cyan_red[SHADOWS] > 0) ? shadows_add : shadows_sub;
cyan_red_transfer[MIDTONES] = (cbd->cyan_red[MIDTONES] > 0) ? midtones_add : midtones_sub;
cyan_red_transfer[HIGHLIGHTS] = (cbd->cyan_red[HIGHLIGHTS] > 0) ? highlights_add : highlights_sub;
magenta_green_transfer[SHADOWS] = (cbd->magenta_green[SHADOWS] > 0) ? shadows_add : shadows_sub;
magenta_green_transfer[MIDTONES] = (cbd->magenta_green[MIDTONES] > 0) ? midtones_add : midtones_sub;
magenta_green_transfer[HIGHLIGHTS] = (cbd->magenta_green[HIGHLIGHTS] > 0) ? highlights_add : highlights_sub;
yellow_blue_transfer[SHADOWS] = (cbd->yellow_blue[SHADOWS] > 0) ? shadows_add : shadows_sub;
yellow_blue_transfer[MIDTONES] = (cbd->yellow_blue[MIDTONES] > 0) ? midtones_add : midtones_sub;
yellow_blue_transfer[HIGHLIGHTS] = (cbd->yellow_blue[HIGHLIGHTS] > 0) ? highlights_add : highlights_sub;
h = srcPR->h;
src = srcPR->data;
dest = destPR->data;
alpha = (srcPR->bytes == 4) ? TRUE : FALSE;
while (h--)
{
w = srcPR->w;
s = src;
d = dest;
while (w--)
{
r = r_n = s[RED_PIX];
g = g_n = s[GREEN_PIX];
b = b_n = s[BLUE_PIX];
r_n += cbd->cyan_red[SHADOWS] * cyan_red_transfer[SHADOWS][r_n];
r_n = CLAMP0255 (r_n);
r_n += cbd->cyan_red[MIDTONES] * cyan_red_transfer[MIDTONES][r_n];
r_n = CLAMP0255 (r_n);
r_n += cbd->cyan_red[HIGHLIGHTS] * cyan_red_transfer[HIGHLIGHTS][r_n];
r_n = CLAMP0255 (r_n);
g_n += cbd->magenta_green[SHADOWS] * magenta_green_transfer[SHADOWS][g_n];
g_n = CLAMP0255 (g_n);
g_n += cbd->magenta_green[MIDTONES] * magenta_green_transfer[MIDTONES][g_n];
g_n = CLAMP0255 (g_n);
g_n += cbd->magenta_green[HIGHLIGHTS] * magenta_green_transfer[HIGHLIGHTS][g_n];
g_n = CLAMP0255 (g_n);
b_n += cbd->yellow_blue[SHADOWS] * yellow_blue_transfer[SHADOWS][b_n];
b_n = CLAMP0255 (b_n);
b_n += cbd->yellow_blue[MIDTONES] * yellow_blue_transfer[MIDTONES][b_n];
b_n = CLAMP0255 (b_n);
b_n += cbd->yellow_blue[HIGHLIGHTS] * yellow_blue_transfer[HIGHLIGHTS][b_n];
b_n = CLAMP0255 (b_n);
if (cbd->preserve_luminosity)
{
rgb_to_hls (&r, &g, &b);
rgb_to_hls (&r_n, &g_n, &b_n);
g_n = g;
hls_to_rgb (&r_n, &g_n, &b_n);
}
d[RED_PIX] = r_n;
d[GREEN_PIX] = g_n;
d[BLUE_PIX] = b_n;
if (alpha)
d[ALPHA_PIX] = s[ALPHA_PIX];
s += srcPR->bytes;
d += destPR->bytes;
}
src += srcPR->rowstride;
dest += destPR->rowstride;
}
}
/* by_color select action functions */
static void
color_balance_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
gdisp = gdisp_ptr;
tool->drawable = gimage_active_drawable (gdisp->gimage);
}
static void
color_balance_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
}
static void
color_balance_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
}
static void
color_balance_cursor_update (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
gdisp = (GDisplay *) gdisp_ptr;
gdisplay_install_tool_cursor (gdisp, GDK_TOP_LEFT_ARROW);
}
static void
color_balance_control (Tool *tool,
int action,
gpointer gdisp_ptr)
{
ColorBalance * color_bal;
color_bal = (ColorBalance *) tool->private;
switch (action)
{
case PAUSE :
break;
case RESUME :
break;
case HALT :
if (color_balance_dialog)
{
active_tool->preserve = TRUE;
image_map_abort (color_balance_dialog->image_map);
active_tool->preserve = FALSE;
color_balance_dialog->image_map = NULL;
color_balance_cancel_callback (NULL, (gpointer) color_balance_dialog);
}
break;
}
}
Tool *
tools_new_color_balance ()
{
Tool * tool;
ColorBalance * private;
/* The tool options */
if (!color_balance_options)
color_balance_options = tools_register_no_options (COLOR_BALANCE, _("Color Balance Options"));
tool = (Tool *) g_malloc (sizeof (Tool));
private = (ColorBalance *) g_malloc (sizeof (ColorBalance));
tool->type = COLOR_BALANCE;
tool->state = INACTIVE;
tool->scroll_lock = 1; /* Disallow scrolling */
tool->private = (void *) private;
tool->auto_snap_to = TRUE;
tool->button_press_func = color_balance_button_press;
tool->button_release_func = color_balance_button_release;
tool->motion_func = color_balance_motion;
tool->arrow_keys_func = standard_arrow_keys_func;
tool->cursor_update_func = color_balance_cursor_update;
tool->control_func = color_balance_control;
tool->preserve = FALSE;
tool->gdisp_ptr = NULL;
tool->drawable = NULL;
return tool;
}
void
tools_free_color_balance (Tool *tool)
{
ColorBalance * color_bal;
color_bal = (ColorBalance *) tool->private;
/* Close the color select dialog */
if (color_balance_dialog)
color_balance_cancel_callback (NULL, (gpointer) color_balance_dialog);
g_free (color_bal);
}
void
color_balance_initialize (GDisplay *gdisp)
{
int i;
if (! drawable_color (gimage_active_drawable (gdisp->gimage)))
{
g_message (_("Color balance operates only on RGB color drawables."));
return;
}
/* The color balance dialog */
if (!color_balance_dialog)
color_balance_dialog = color_balance_new_dialog ();
else
if (!GTK_WIDGET_VISIBLE (color_balance_dialog->shell))
gtk_widget_show (color_balance_dialog->shell);
/* Initialize dialog fields */
color_balance_dialog->image_map = NULL;
for (i = 0; i < 3; i++)
{
color_balance_dialog->cyan_red[i] = 0.0;
color_balance_dialog->magenta_green[i] = 0.0;
color_balance_dialog->yellow_blue[i] = 0.0;
}
color_balance_dialog->drawable = gimage_active_drawable (gdisp->gimage);
color_balance_dialog->image_map = image_map_create (gdisp, color_balance_dialog->drawable);
color_balance_update (color_balance_dialog, ALL);
}
/****************************/
/* Select by Color dialog */
/****************************/
/* the action area structure */
static ActionAreaItem action_items[] =
{
{ N_("OK"), color_balance_ok_callback, NULL, NULL },
{ N_("Cancel"), color_balance_cancel_callback, NULL, NULL }
};
static ColorBalanceDialog *
color_balance_new_dialog ()
{
ColorBalanceDialog *cbd;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *table;
GtkWidget *start_label;
GtkWidget *end_label;
GtkWidget *label;
GtkWidget *slider;
GtkWidget *toggle;
GtkWidget *radio_button;
GtkObject *data;
GSList *group = NULL;
int i;
char *appl_mode_names[3] =
{
N_("Shadows"),
N_("Midtones"),
N_("Highlights")
};
ActionCallback appl_mode_callbacks[3] =
{
color_balance_shadows_callback,
color_balance_midtones_callback,
color_balance_highlights_callback
};
cbd = g_malloc (sizeof (ColorBalanceDialog));
cbd->preserve_luminosity = TRUE;
cbd->preview = TRUE;
cbd->application_mode = SHADOWS;
/* The shell and main vbox */
cbd->shell = gtk_dialog_new ();
gtk_window_set_wmclass (GTK_WINDOW (cbd->shell), "color_balance", "Gimp");
gtk_window_set_title (GTK_WINDOW (cbd->shell), _("Color Balance"));
/* handle the wm close signal */
gtk_signal_connect (GTK_OBJECT (cbd->shell), "delete_event",
GTK_SIGNAL_FUNC (color_balance_delete_callback),
cbd);
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 2);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (cbd->shell)->vbox), vbox, TRUE, TRUE, 0);
/* Horizontal box for application mode */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new (_("Color Levels: "));
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, FALSE, 0);
gtk_widget_show (label);
/* cyan-red text */
cbd->cyan_red_text = gtk_entry_new ();
gtk_widget_set_usize (cbd->cyan_red_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), cbd->cyan_red_text, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (cbd->cyan_red_text), "changed",
(GtkSignalFunc) color_balance_cr_text_update,
cbd);
gtk_widget_show (cbd->cyan_red_text);
/* magenta-green text */
cbd->magenta_green_text = gtk_entry_new ();
gtk_widget_set_usize (cbd->magenta_green_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), cbd->magenta_green_text, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (cbd->magenta_green_text), "changed",
(GtkSignalFunc) color_balance_mg_text_update,
cbd);
gtk_widget_show (cbd->magenta_green_text);
/* yellow-blue text */
cbd->yellow_blue_text = gtk_entry_new ();
gtk_widget_set_usize (cbd->yellow_blue_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), cbd->yellow_blue_text, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (cbd->yellow_blue_text), "changed",
(GtkSignalFunc) color_balance_yb_text_update,
cbd);
gtk_widget_show (cbd->yellow_blue_text);
gtk_widget_show (hbox);
/* The table containing sliders */
table = gtk_table_new (3, 3, FALSE);
gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
/* Create the cyan-red scale widget */
start_label = gtk_label_new (_("Cyan"));
gtk_misc_set_alignment (GTK_MISC (start_label), 1.0, 1.0);
gtk_table_attach (GTK_TABLE (table), start_label, 0, 1, 0, 1,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
data = gtk_adjustment_new (0, -100.0, 100.0, 1.0, 1.0, 0.0);
cbd->cyan_red_data = GTK_ADJUSTMENT (data);
slider = gtk_hscale_new (GTK_ADJUSTMENT (data));
gtk_scale_set_digits (GTK_SCALE (slider), 0);
gtk_table_attach (GTK_TABLE (table), slider, 1, 2, 0, 1,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
2, 2);
gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (data), "value_changed",
(GtkSignalFunc) color_balance_cr_scale_update,
cbd);
end_label = gtk_label_new (_("Red"));
gtk_misc_set_alignment (GTK_MISC (end_label), 0.0, 1.0);
gtk_table_attach (GTK_TABLE (table), end_label, 2, 3, 0, 1,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
gtk_widget_show (start_label);
gtk_widget_show (end_label);
gtk_widget_show (slider);
/* Create the magenta-green scale widget */
start_label = gtk_label_new (_("Magenta"));
gtk_misc_set_alignment (GTK_MISC (start_label), 1.0, 1.0);
gtk_table_attach (GTK_TABLE (table), start_label, 0, 1, 1, 2,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
data = gtk_adjustment_new (0, -100.0, 100.0, 1.0, 1.0, 0.0);
cbd->magenta_green_data = GTK_ADJUSTMENT (data);
slider = gtk_hscale_new (GTK_ADJUSTMENT (data));
gtk_scale_set_digits (GTK_SCALE (slider), 0);
gtk_table_attach (GTK_TABLE (table), slider, 1, 2, 1, 2,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
2, 2);
gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (data), "value_changed",
(GtkSignalFunc) color_balance_mg_scale_update,
cbd);
end_label = gtk_label_new (_("Green"));
gtk_misc_set_alignment (GTK_MISC (end_label), 0.0, 1.0);
gtk_table_attach (GTK_TABLE (table), end_label, 2, 3, 1, 2,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
gtk_widget_show (start_label);
gtk_widget_show (end_label);
gtk_widget_show (slider);
/* Create the yellow-blue scale widget */
start_label = gtk_label_new (_("Yellow"));
gtk_misc_set_alignment (GTK_MISC (start_label), 1.0, 1.0);
gtk_table_attach (GTK_TABLE (table), start_label, 0, 1, 2, 3,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
data = gtk_adjustment_new (0, -100.0, 100.0, 1.0, 1.0, 0.0);
cbd->yellow_blue_data = GTK_ADJUSTMENT (data);
slider = gtk_hscale_new (GTK_ADJUSTMENT (data));
gtk_scale_set_digits (GTK_SCALE (slider), 0);
gtk_table_attach (GTK_TABLE (table), slider, 1, 2, 2, 3,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
2, 2);
gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (data), "value_changed",
(GtkSignalFunc) color_balance_yb_scale_update,
cbd);
end_label = gtk_label_new (_("Blue"));
gtk_misc_set_alignment (GTK_MISC (end_label), 0.0, 1.0);
gtk_table_attach (GTK_TABLE (table), end_label, 2, 3, 2, 3,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
gtk_widget_show (start_label);
gtk_widget_show (end_label);
gtk_widget_show (slider);
/* Horizontal box for preview and preserve luminosity toggle buttons */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
/* The preview toggle */
toggle = gtk_check_button_new_with_label (_("Preview"));
gtk_toggle_button_set_state (GTK_TOGGLE_BUTTON (toggle), cbd->preview);
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) color_balance_preview_update,
cbd);
gtk_widget_show (toggle);
/* The preserve luminosity toggle */
toggle = gtk_check_button_new_with_label (_("Preserve Luminosity"));
gtk_toggle_button_set_state (GTK_TOGGLE_BUTTON (toggle), cbd->preserve_luminosity);
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) color_balance_preserve_update,
cbd);
gtk_widget_show (toggle);
gtk_widget_show (hbox);
/* Horizontal box for application mode */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
/* the radio buttons for application mode */
for (i = 0; i < 3; i++)
{
radio_button = gtk_radio_button_new_with_label (group, appl_mode_names[i]);
group = gtk_radio_button_group (GTK_RADIO_BUTTON (radio_button));
gtk_box_pack_start (GTK_BOX (hbox), radio_button, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (radio_button), "toggled",
(GtkSignalFunc) appl_mode_callbacks[i],
cbd);
gtk_widget_show (radio_button);
}
gtk_widget_show (hbox);
/* The action area */
action_items[0].user_data = cbd;
action_items[1].user_data = cbd;
build_action_area (GTK_DIALOG (cbd->shell), action_items, 2, 0);
gtk_widget_show (table);
gtk_widget_show (vbox);
gtk_widget_show (cbd->shell);
return cbd;
}
static void
color_balance_update (ColorBalanceDialog *cbd,
int update)
{
char text[12];
if (update & CR_SLIDER)
{
cbd->cyan_red_data->value = cbd->cyan_red[cbd->application_mode];
gtk_signal_emit_by_name (GTK_OBJECT (cbd->cyan_red_data), "value_changed");
}
if (update & MG_SLIDER)
{
cbd->magenta_green_data->value = cbd->magenta_green[cbd->application_mode];
gtk_signal_emit_by_name (GTK_OBJECT (cbd->magenta_green_data), "value_changed");
}
if (update & YB_SLIDER)
{
cbd->yellow_blue_data->value = cbd->yellow_blue[cbd->application_mode];
gtk_signal_emit_by_name (GTK_OBJECT (cbd->yellow_blue_data), "value_changed");
}
if (update & CR_TEXT)
{
sprintf (text, "%0.0f", cbd->cyan_red[cbd->application_mode]);
gtk_entry_set_text (GTK_ENTRY (cbd->cyan_red_text), text);
}
if (update & MG_TEXT)
{
sprintf (text, "%0.0f", cbd->magenta_green[cbd->application_mode]);
gtk_entry_set_text (GTK_ENTRY (cbd->magenta_green_text), text);
}
if (update & YB_TEXT)
{
sprintf (text, "%0.0f", cbd->yellow_blue[cbd->application_mode]);
gtk_entry_set_text (GTK_ENTRY (cbd->yellow_blue_text), text);
}
}
static void
color_balance_preview (ColorBalanceDialog *cbd)
{
if (!cbd->image_map)
g_message (_("color_balance_preview(): No image map"));
active_tool->preserve = TRUE;
image_map_apply (cbd->image_map, color_balance, (void *) cbd);
active_tool->preserve = FALSE;
}
static void
color_balance_ok_callback (GtkWidget *widget,
gpointer client_data)
{
ColorBalanceDialog *cbd;
cbd = (ColorBalanceDialog *) client_data;
if (GTK_WIDGET_VISIBLE (cbd->shell))
gtk_widget_hide (cbd->shell);
active_tool->preserve = TRUE;
if (!cbd->preview)
image_map_apply (cbd->image_map, color_balance, (void *) cbd);
if (cbd->image_map)
image_map_commit (cbd->image_map);
active_tool->preserve = FALSE;
cbd->image_map = NULL;
}
static gint
color_balance_delete_callback (GtkWidget *w,
GdkEvent *e,
gpointer client_data)
{
color_balance_cancel_callback (w, client_data);
return TRUE;
}
static void
color_balance_cancel_callback (GtkWidget *widget,
gpointer client_data)
{
ColorBalanceDialog *cbd;
cbd = (ColorBalanceDialog *) client_data;
if (GTK_WIDGET_VISIBLE (cbd->shell))
gtk_widget_hide (cbd->shell);
if (cbd->image_map)
{
active_tool->preserve = TRUE;
image_map_abort (cbd->image_map);
active_tool->preserve = FALSE;
gdisplays_flush ();
}
cbd->image_map = NULL;
}
static void
color_balance_shadows_callback (GtkWidget *widget,
gpointer client_data)
{
ColorBalanceDialog *cbd;
cbd = (ColorBalanceDialog *) client_data;
cbd->application_mode = SHADOWS;
color_balance_update (cbd, ALL);
}
static void
color_balance_midtones_callback (GtkWidget *widget,
gpointer client_data)
{
ColorBalanceDialog *cbd;
cbd = (ColorBalanceDialog *) client_data;
cbd->application_mode = MIDTONES;
color_balance_update (cbd, ALL);
}
static void
color_balance_highlights_callback (GtkWidget *widget,
gpointer client_data)
{
ColorBalanceDialog *cbd;
cbd = (ColorBalanceDialog *) client_data;
cbd->application_mode = HIGHLIGHTS;
color_balance_update (cbd, ALL);
}
static void
color_balance_preserve_update (GtkWidget *w,
gpointer data)
{
ColorBalanceDialog *cbd;
cbd = (ColorBalanceDialog *) data;
if (GTK_TOGGLE_BUTTON (w)->active)
{
cbd->preserve_luminosity = TRUE;
if (cbd->preview)
color_balance_preview (cbd);
}
else
{
cbd->preserve_luminosity = FALSE;
if (cbd->preview)
color_balance_preview (cbd);
}
}
static void
color_balance_preview_update (GtkWidget *w,
gpointer data)
{
ColorBalanceDialog *cbd;
cbd = (ColorBalanceDialog *) data;
if (GTK_TOGGLE_BUTTON (w)->active)
{
cbd->preview = TRUE;
color_balance_preview (cbd);
}
else
cbd->preview = FALSE;
}
static void
color_balance_cr_scale_update (GtkAdjustment *adjustment,
gpointer data)
{
ColorBalanceDialog *cbd;
cbd = (ColorBalanceDialog *) data;
if (cbd->cyan_red[cbd->application_mode] != adjustment->value)
{
cbd->cyan_red[cbd->application_mode] = adjustment->value;
color_balance_update (cbd, CR_TEXT);
if (cbd->preview)
color_balance_preview (cbd);
}
}
static void
color_balance_mg_scale_update (GtkAdjustment *adjustment,
gpointer data)
{
ColorBalanceDialog *cbd;
cbd = (ColorBalanceDialog *) data;
if (cbd->magenta_green[cbd->application_mode] != adjustment->value)
{
cbd->magenta_green[cbd->application_mode] = adjustment->value;
color_balance_update (cbd, MG_TEXT);
if (cbd->preview)
color_balance_preview (cbd);
}
}
static void
color_balance_yb_scale_update (GtkAdjustment *adjustment,
gpointer data)
{
ColorBalanceDialog *cbd;
cbd = (ColorBalanceDialog *) data;
if (cbd->yellow_blue[cbd->application_mode] != adjustment->value)
{
cbd->yellow_blue[cbd->application_mode] = adjustment->value;
color_balance_update (cbd, YB_TEXT);
if (cbd->preview)
color_balance_preview (cbd);
}
}
static void
color_balance_cr_text_update (GtkWidget *w,
gpointer data)
{
ColorBalanceDialog *cbd;
char *str;
int value;
str = gtk_entry_get_text (GTK_ENTRY (w));
cbd = (ColorBalanceDialog *) data;
value = BOUNDS (((int) atof (str)), -100, 100);
if ((int) cbd->cyan_red[cbd->application_mode] != value)
{
cbd->cyan_red[cbd->application_mode] = value;
color_balance_update (cbd, CR_SLIDER);
if (cbd->preview)
color_balance_preview (cbd);
}
}
static void
color_balance_mg_text_update (GtkWidget *w,
gpointer data)
{
ColorBalanceDialog *cbd;
char *str;
int value;
str = gtk_entry_get_text (GTK_ENTRY (w));
cbd = (ColorBalanceDialog *) data;
value = BOUNDS (((int) atof (str)), -100, 100);
if ((int) cbd->magenta_green[cbd->application_mode] != value)
{
cbd->magenta_green[cbd->application_mode] = value;
color_balance_update (cbd, MG_SLIDER);
if (cbd->preview)
color_balance_preview (cbd);
}
}
static void
color_balance_yb_text_update (GtkWidget *w,
gpointer data)
{
ColorBalanceDialog *cbd;
char *str;
int value;
str = gtk_entry_get_text (GTK_ENTRY (w));
cbd = (ColorBalanceDialog *) data;
value = BOUNDS (((int) atof (str)), -100, 100);
if ((int) cbd->yellow_blue[cbd->application_mode] != value)
{
cbd->yellow_blue[cbd->application_mode] = value;
color_balance_update (cbd, YB_SLIDER);
if (cbd->preview)
color_balance_preview (cbd);
}
}
/* The color_balance procedure definition */
ProcArg color_balance_args[] =
{
{ PDB_DRAWABLE,
"drawable",
"the drawable"
},
{ PDB_INT32,
"transfer_mode",
"Transfer mode: { SHADOWS (0), MIDTONES (1), HIGHLIGHTS (2) }"
},
{ PDB_INT32,
"preserve_lum",
"Preserve luminosity values at each pixel"
},
{ PDB_FLOAT,
"cyan_red",
"Cyan-Red color balance: (-100 <= cyan_red <= 100)"
},
{ PDB_FLOAT,
"magenta_green",
"Magenta-Green color balance: (-100 <= magenta_green <= 100)"
},
{ PDB_FLOAT,
"yellow_blue",
"Yellow-Blue color balance: (-100 <= yellow_blue <= 100)"
}
};
ProcRecord color_balance_proc =
{
"gimp_color_balance",
"Modify the color balance of the specified drawable",
"Modify the color balance of the specified drawable. There are three axis which can be modified: cyan-red, magenta-green, and yellow-blue. Negative values increase the amount of the former, positive values increase the amount of the latter. Color balance can be controlled with the 'transfer_mode' setting, which allows shadows, midtones, and highlights in an image to be affected differently. The 'preserve_lum' parameter, if non-zero, ensures that the luminosity of each pixel remains fixed.",
"Spencer Kimball & Peter Mattis",
"Spencer Kimball & Peter Mattis",
"1997",
PDB_INTERNAL,
/* Input arguments */
6,
color_balance_args,
/* Output arguments */
0,
NULL,
/* Exec method */
{ { color_balance_invoker } },
};
static Argument *
color_balance_invoker (Argument *args)
{
PixelRegion srcPR, destPR;
int success = TRUE;
int int_value;
ColorBalanceDialog cbd;
GImage *gimage;
int transfer_mode;
int preserve_lum;
double cyan_red;
double magenta_green;
double yellow_blue;
double fp_value;
int x1, y1, x2, y2;
int i;
void *pr;
GimpDrawable *drawable;
drawable = NULL;
transfer_mode = MIDTONES;
cyan_red = 0;
magenta_green = 0;
yellow_blue = 0;
/* the drawable */
if (success)
{
int_value = args[0].value.pdb_int;
drawable = drawable_get_ID (int_value);
if (drawable == NULL)
success = FALSE;
else
gimage = drawable_gimage (drawable);
}
/* make sure the drawable is not indexed color */
if (success)
success = ! drawable_indexed (drawable);
/* transfer_mode */
if (success)
{
int_value = args[1].value.pdb_int;
switch (int_value)
{
case 0: transfer_mode = SHADOWS; break;
case 1: transfer_mode = MIDTONES; break;
case 2: transfer_mode = HIGHLIGHTS; break;
default: success = FALSE; break;
}
}
/* preserve_lum */
if (success)
{
int_value = args[2].value.pdb_int;
preserve_lum = (int_value) ? TRUE : FALSE;
}
/* cyan_red */
if (success)
{
fp_value = args[3].value.pdb_float;
if (fp_value >= -100 && fp_value <= 100)
cyan_red = fp_value;
else
success = FALSE;
}
/* magenta_green */
if (success)
{
fp_value = args[4].value.pdb_float;
if (fp_value >= -100 && fp_value <= 100)
magenta_green = fp_value;
else
success = FALSE;
}
/* yellow_blue */
if (success)
{
fp_value = args[5].value.pdb_float;
if (fp_value >= -100 && fp_value <= 100)
yellow_blue = fp_value;
else
success = FALSE;
}
/* arrange to modify the color balance */
if (success)
{
for (i = 0; i < 3; i++)
{
cbd.cyan_red[i] = 0.0;
cbd.magenta_green[i] = 0.0;
cbd.yellow_blue[i] = 0.0;
}
cbd.preserve_luminosity = preserve_lum;
cbd.cyan_red[transfer_mode] = cyan_red;
cbd.magenta_green[transfer_mode] = magenta_green;
cbd.yellow_blue[transfer_mode] = yellow_blue;
/* The application should occur only within selection bounds */
drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
pixel_region_init (&srcPR, drawable_data (drawable), x1, y1, (x2 - x1), (y2 - y1), FALSE);
pixel_region_init (&destPR, drawable_shadow (drawable), x1, y1, (x2 - x1), (y2 - y1), TRUE);
for (pr = pixel_regions_register (2, &srcPR, &destPR); pr != NULL; pr = pixel_regions_process (pr))
color_balance (&srcPR, &destPR, (void *) &cbd);
drawable_merge_shadow (drawable, TRUE);
drawable_update (drawable, x1, y1, (x2 - x1), (y2 - y1));
}
return procedural_db_return_args (&color_balance_proc, success);
}
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