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gimp/app/tools/levels.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 "buildmenu.h"
#include "colormaps.h"
#include "drawable.h"
#include "general.h"
#include "gdisplay.h"
#include "histogramwidget.h"
#include "gimphistogram.h"
#include "image_map.h"
#include "interface.h"
#include "levels.h"
#include "gimplut.h"
#include "lut_funcs.h"
#include "libgimp/gimpintl.h"
#define LOW_INPUT 0x1
#define GAMMA 0x2
#define HIGH_INPUT 0x4
#define LOW_OUTPUT 0x8
#define HIGH_OUTPUT 0x10
#define INPUT_LEVELS 0x20
#define OUTPUT_LEVELS 0x40
#define INPUT_SLIDERS 0x80
#define OUTPUT_SLIDERS 0x100
#define DRAW 0x200
#define ALL 0xFFF
#define TEXT_WIDTH 45
#define DA_WIDTH 256
#define DA_HEIGHT 25
#define GRADIENT_HEIGHT 15
#define CONTROL_HEIGHT DA_HEIGHT - GRADIENT_HEIGHT
#define HISTOGRAM_WIDTH 256
#define HISTOGRAM_HEIGHT 150
#define LEVELS_DA_MASK GDK_EXPOSURE_MASK | \
GDK_ENTER_NOTIFY_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON1_MOTION_MASK | \
GDK_POINTER_MOTION_HINT_MASK
/* the levels structures */
typedef struct _Levels Levels;
struct _Levels
{
int x, y; /* coords for last mouse click */
};
typedef struct _LevelsDialog LevelsDialog;
struct _LevelsDialog
{
GtkWidget * shell;
GtkWidget * low_input_spin;
GtkAdjustment *low_input_adj;
GtkWidget * gamma_text;
GtkWidget * high_input_spin;
GtkAdjustment *high_input_adj;
GtkWidget * low_output_spin;
GtkAdjustment *low_output_adj;
GtkWidget * high_output_spin;
GtkAdjustment *high_output_adj;
GtkWidget * input_levels_da[2];
GtkWidget * output_levels_da[2];
GtkWidget * channel_menu;
HistogramWidget *histogram;
GimpHistogram *hist;
GimpDrawable * drawable;
ImageMap image_map;
int color;
int channel;
int low_input[5];
double gamma[5];
int high_input[5];
int low_output[5];
int high_output[5];
gint preview;
int active_slider;
int slider_pos[5]; /* positions for the five sliders */
unsigned char input[5][256]; /* this is used only by the gui */
GimpLut *lut;
};
/* the levels tool options */
static ToolOptions *levels_options = NULL;
/* the levels tool dialog */
static LevelsDialog *levels_dialog = NULL;
/* levels action functions */
static void levels_control (Tool *, ToolAction, gpointer);
static LevelsDialog * levels_new_dialog (void);
static void levels_calculate_transfers (LevelsDialog *);
static void levels_update (LevelsDialog *, int);
static void levels_preview (LevelsDialog *);
static void levels_value_callback (GtkWidget *, gpointer);
static void levels_red_callback (GtkWidget *, gpointer);
static void levels_green_callback (GtkWidget *, gpointer);
static void levels_blue_callback (GtkWidget *, gpointer);
static void levels_alpha_callback (GtkWidget *, gpointer);
static void levels_auto_levels_callback (GtkWidget *, gpointer);
static void levels_ok_callback (GtkWidget *, gpointer);
static void levels_cancel_callback (GtkWidget *, gpointer);
static gint levels_delete_callback (GtkWidget *, GdkEvent *, gpointer);
static void levels_preview_update (GtkWidget *, gpointer);
static void levels_low_input_spin_update (GtkWidget *, gpointer);
static void levels_gamma_text_update (GtkWidget *, gpointer);
static void levels_high_input_spin_update (GtkWidget *, gpointer);
static void levels_low_output_spin_update (GtkWidget *, gpointer);
static void levels_high_output_spin_update (GtkWidget *, gpointer);
static gint levels_input_da_events (GtkWidget *, GdkEvent *,
LevelsDialog *);
static gint levels_output_da_events (GtkWidget *, GdkEvent *,
LevelsDialog *);
static void levels_histogram_range (HistogramWidget *,
int, int, void *);
static void
levels_histogram_range (HistogramWidget *h,
int start,
int end,
void *user_data)
{
LevelsDialog *ld;
ld = (LevelsDialog *) user_data;
histogram_widget_range (ld->histogram, -1, -1);
}
/* levels action functions */
static void
levels_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
switch (action)
{
case PAUSE:
break;
case RESUME:
break;
case HALT:
if (levels_dialog)
levels_cancel_callback (NULL, (gpointer) levels_dialog);
break;
default:
break;
}
}
Tool *
tools_new_levels ()
{
Tool * tool;
Levels * private;
/* The tool options */
if (! levels_options)
{
levels_options = tool_options_new (_("Levels Options"));
tools_register (LEVELS, levels_options);
}
tool = tools_new_tool (LEVELS);
private = g_new (Levels, 1);
tool->scroll_lock = TRUE; /* Disallow scrolling */
tool->preserve = FALSE; /* Don't preserve on drawable change */
tool->private = (void *) private;
tool->control_func = levels_control;
return tool;
}
void
tools_free_levels (Tool *tool)
{
Levels * _levels;
_levels = (Levels *) tool->private;
/* Close the color select dialog */
if (levels_dialog)
levels_cancel_callback (NULL, (gpointer) levels_dialog);
g_free (_levels);
}
static MenuItem color_option_items[] =
{
{ N_("Value"), 0, 0, levels_value_callback, NULL, NULL, NULL },
{ N_("Red"), 0, 0, levels_red_callback, NULL, NULL, NULL },
{ N_("Green"), 0, 0, levels_green_callback, NULL, NULL, NULL },
{ N_("Blue"), 0, 0, levels_blue_callback, NULL, NULL, NULL },
{ N_("Alpha"), 0, 0, levels_alpha_callback, NULL, NULL, NULL },
{ NULL, 0, 0, NULL, NULL, NULL, NULL }
};
void
levels_initialize (GDisplay *gdisp)
{
int i;
if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
{
g_message (_("Levels for indexed drawables cannot be adjusted."));
return;
}
/* The levels dialog */
if (!levels_dialog)
levels_dialog = levels_new_dialog ();
else
if (!GTK_WIDGET_VISIBLE (levels_dialog->shell))
gtk_widget_show (levels_dialog->shell);
/* Initialize the values */
levels_dialog->channel = HISTOGRAM_VALUE;
for (i = 0; i < 5; i++)
{
levels_dialog->low_input[i] = 0;
levels_dialog->gamma[i] = 1.0;
levels_dialog->high_input[i] = 255;
levels_dialog->low_output[i] = 0;
levels_dialog->high_output[i] = 255;
}
levels_dialog->drawable = gimage_active_drawable (gdisp->gimage);
levels_dialog->color = drawable_color (levels_dialog->drawable);
levels_dialog->image_map = image_map_create (gdisp, levels_dialog->drawable);
/* check for alpha channel */
if (drawable_has_alpha (levels_dialog->drawable))
gtk_widget_set_sensitive( color_option_items[4].widget, TRUE);
else
gtk_widget_set_sensitive( color_option_items[4].widget, FALSE);
/* hide or show the channel menu based on image type */
if (levels_dialog->color)
for (i = 0; i < 4; i++)
gtk_widget_set_sensitive( color_option_items[i].widget, TRUE);
else
for (i = 1; i < 4; i++)
gtk_widget_set_sensitive( color_option_items[i].widget, FALSE);
/* set the current selection */
gtk_option_menu_set_history ( GTK_OPTION_MENU (levels_dialog->channel_menu), 0);
levels_update (levels_dialog, LOW_INPUT | GAMMA | HIGH_INPUT | LOW_OUTPUT | HIGH_OUTPUT | DRAW);
levels_update (levels_dialog, INPUT_LEVELS | OUTPUT_LEVELS);
gimp_histogram_calculate_drawable (levels_dialog->hist,
levels_dialog->drawable);
histogram_widget_update(levels_dialog->histogram, levels_dialog->hist);
histogram_widget_range (levels_dialog->histogram, -1, -1);
}
void
levels_free ()
{
if (levels_dialog)
{
if (levels_dialog->image_map)
{
active_tool->preserve = TRUE;
image_map_abort (levels_dialog->image_map);
active_tool->preserve = FALSE;
levels_dialog->image_map = NULL;
}
gtk_widget_destroy (levels_dialog->shell);
}
}
/*******************/
/* Levels dialog */
/*******************/
static LevelsDialog *
levels_new_dialog ()
{
LevelsDialog *ld;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *vbox2;
GtkWidget *label;
GtkWidget *frame;
GtkWidget *toggle;
GtkWidget *channel_hbox;
GtkWidget *menu;
int i;
static ActionAreaItem action_items[] =
{
{ N_("Auto Levels"), levels_auto_levels_callback, NULL, NULL },
{ N_("OK"), levels_ok_callback, NULL, NULL },
{ N_("Cancel"), levels_cancel_callback, NULL, NULL }
};
ld = g_malloc (sizeof (LevelsDialog));
ld->preview = TRUE;
ld->lut = gimp_lut_new();
ld->hist = gimp_histogram_new();
for (i = 0; i < 5; i++)
color_option_items [i].user_data = (gpointer) ld;
/* The shell and main vbox */
ld->shell = gtk_dialog_new ();
gtk_window_set_wmclass (GTK_WINDOW (ld->shell), "levels", "Gimp");
gtk_window_set_title (GTK_WINDOW (ld->shell), _("Levels"));
/* handle the wm close signal */
gtk_signal_connect (GTK_OBJECT (ld->shell), "delete_event",
GTK_SIGNAL_FUNC (levels_delete_callback),
ld);
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 2);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (ld->shell)->vbox), vbox, TRUE, TRUE, 0);
/* The option menu for selecting channels */
channel_hbox = gtk_hbox_new (FALSE, 2);
gtk_box_pack_start (GTK_BOX (vbox), channel_hbox, FALSE, FALSE, 0);
label = gtk_label_new (_("Modify Levels for Channel: "));
gtk_box_pack_start (GTK_BOX (channel_hbox), label, FALSE, FALSE, 0);
menu = build_menu (color_option_items, NULL);
ld->channel_menu = gtk_option_menu_new ();
gtk_box_pack_start (GTK_BOX (channel_hbox), ld->channel_menu, FALSE, FALSE, 2);
gtk_widget_show (label);
gtk_widget_show (ld->channel_menu);
gtk_widget_show (channel_hbox);
gtk_option_menu_set_menu (GTK_OPTION_MENU (ld->channel_menu), menu);
/* Horizontal box for levels text and spin widgets */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new (_("Input Levels: "));
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
/* low input spin */
ld->low_input_adj = GTK_ADJUSTMENT(gtk_adjustment_new (0, 0, 255, 1, 10, 10));
ld->low_input_spin = gtk_spin_button_new (ld->low_input_adj, 0.5, 0);
gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(ld->low_input_spin), TRUE);
gtk_box_pack_start (GTK_BOX (hbox), ld->low_input_spin, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (ld->low_input_adj), "value_changed",
(GtkSignalFunc) levels_low_input_spin_update,
ld);
gtk_widget_show (ld->low_input_spin);
/* input gamma text */
ld->gamma_text = gtk_entry_new ();
gtk_entry_set_text (GTK_ENTRY (ld->gamma_text), "1.0");
gtk_widget_set_usize (ld->gamma_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), ld->gamma_text, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (ld->gamma_text), "changed",
(GtkSignalFunc) levels_gamma_text_update,
ld);
gtk_widget_show (ld->gamma_text);
gtk_widget_show (hbox);
/* high input spin */
ld->high_input_adj = GTK_ADJUSTMENT(gtk_adjustment_new (255, 0, 255, 1, 10, 10));
ld->high_input_spin = gtk_spin_button_new (ld->high_input_adj, 0.5, 0);
gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(ld->high_input_spin), TRUE);
gtk_box_pack_start (GTK_BOX (hbox), ld->high_input_spin, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (ld->high_input_adj), "value_changed",
(GtkSignalFunc) levels_high_input_spin_update,
ld);
gtk_widget_show (ld->high_input_spin);
gtk_widget_show (hbox);
/* The levels histogram */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, FALSE, 0);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, FALSE, 0);
ld->histogram = histogram_widget_new(HISTOGRAM_WIDTH, HISTOGRAM_HEIGHT);
gtk_signal_connect (GTK_OBJECT (ld->histogram), "rangechanged",
(GtkSignalFunc) levels_histogram_range,
(void*)ld);
gtk_container_add (GTK_CONTAINER (frame), GTK_WIDGET(ld->histogram));
gtk_widget_show (GTK_WIDGET(ld->histogram));
gtk_widget_show (frame);
gtk_widget_show (hbox);
/* The input levels drawing area */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, FALSE, 0);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
vbox2 = gtk_vbox_new (FALSE, 2);
gtk_container_add (GTK_CONTAINER (frame), vbox2);
ld->input_levels_da[0] = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (ld->input_levels_da[0]), DA_WIDTH, GRADIENT_HEIGHT);
gtk_widget_set_events (ld->input_levels_da[0], LEVELS_DA_MASK);
gtk_signal_connect (GTK_OBJECT (ld->input_levels_da[0]), "event",
(GtkSignalFunc) levels_input_da_events,
ld);
gtk_box_pack_start (GTK_BOX (vbox2), ld->input_levels_da[0], FALSE, TRUE, 0);
ld->input_levels_da[1] = gtk_drawing_area_new ();
gtk_drawing_area_size (GTK_DRAWING_AREA (ld->input_levels_da[1]), DA_WIDTH, CONTROL_HEIGHT);
gtk_widget_set_events (ld->input_levels_da[1], LEVELS_DA_MASK);
gtk_signal_connect (GTK_OBJECT (ld->input_levels_da[1]), "event",
(GtkSignalFunc) levels_input_da_events,
ld);
gtk_box_pack_start (GTK_BOX (vbox2), ld->input_levels_da[1], FALSE, TRUE, 0);
gtk_widget_show (ld->input_levels_da[0]);
gtk_widget_show (ld->input_levels_da[1]);
gtk_widget_show (vbox2);
gtk_widget_show (frame);
gtk_widget_show (hbox);
/* Horizontal box for levels spin widgets */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new (_("Output Levels: "));
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
/* low output spin */
ld->low_output_adj = GTK_ADJUSTMENT(gtk_adjustment_new (0, 0, 255, 1, 10, 10));
ld->low_output_spin = gtk_spin_button_new (ld->low_output_adj, 0.5, 0);
gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(ld->low_input_spin), TRUE);
gtk_box_pack_start (GTK_BOX (hbox), ld->low_output_spin, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (ld->low_output_adj), "value_changed",
(GtkSignalFunc) levels_low_output_spin_update,
ld);
gtk_widget_show (ld->low_output_spin);
/* high output spin */
ld->high_output_adj = GTK_ADJUSTMENT(gtk_adjustment_new (255, 0, 255, 1, 10, 10));
ld->high_output_spin = gtk_spin_button_new (ld->high_output_adj, 0.5, 0);
gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(ld->high_input_spin), TRUE);
gtk_box_pack_start (GTK_BOX (hbox), ld->high_output_spin, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (ld->high_output_adj), "value_changed",
(GtkSignalFunc) levels_high_output_spin_update,
ld);
gtk_widget_show (ld->high_output_spin);
gtk_widget_show (hbox);
/* The output levels drawing area */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, FALSE, 0);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
vbox2 = gtk_vbox_new (FALSE, 2);
gtk_container_add (GTK_CONTAINER (frame), vbox2);
ld->output_levels_da[0] = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (ld->output_levels_da[0]), DA_WIDTH, GRADIENT_HEIGHT);
gtk_widget_set_events (ld->output_levels_da[0], LEVELS_DA_MASK);
gtk_signal_connect (GTK_OBJECT (ld->output_levels_da[0]), "event",
(GtkSignalFunc) levels_output_da_events,
ld);
gtk_box_pack_start (GTK_BOX (vbox2), ld->output_levels_da[0], FALSE, TRUE, 0);
ld->output_levels_da[1] = gtk_preview_new (GTK_PREVIEW_GRAYSCALE);
gtk_preview_size (GTK_PREVIEW (ld->output_levels_da[1]), DA_WIDTH, CONTROL_HEIGHT);
gtk_widget_set_events (ld->output_levels_da[1], LEVELS_DA_MASK);
gtk_signal_connect (GTK_OBJECT (ld->output_levels_da[1]), "event",
(GtkSignalFunc) levels_output_da_events,
ld);
gtk_box_pack_start (GTK_BOX (vbox2), ld->output_levels_da[1], FALSE, TRUE, 0);
gtk_widget_show (ld->output_levels_da[0]);
gtk_widget_show (ld->output_levels_da[1]);
gtk_widget_show (vbox2);
gtk_widget_show (frame);
gtk_widget_show (hbox);
/* Horizontal box for preview */
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_active (GTK_TOGGLE_BUTTON (toggle), ld->preview);
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) levels_preview_update,
ld);
gtk_widget_show (label);
gtk_widget_show (toggle);
gtk_widget_show (hbox);
/* The action area */
action_items[0].user_data = ld;
action_items[1].user_data = ld;
action_items[2].user_data = ld;
build_action_area (GTK_DIALOG (ld->shell), action_items, 3, 0);
gtk_widget_show (vbox);
gtk_widget_show (ld->shell);
return ld;
}
static void
levels_draw_slider (GdkWindow *window,
GdkGC *border_gc,
GdkGC *fill_gc,
int xpos)
{
int y;
for (y = 0; y < CONTROL_HEIGHT; y++)
gdk_draw_line(window, fill_gc, xpos - y / 2, y,
xpos + y / 2, y);
gdk_draw_line(window, border_gc, xpos, 0,
xpos - (CONTROL_HEIGHT - 1) / 2, CONTROL_HEIGHT - 1);
gdk_draw_line(window, border_gc, xpos, 0,
xpos + (CONTROL_HEIGHT - 1) / 2, CONTROL_HEIGHT - 1);
gdk_draw_line(window, border_gc, xpos - (CONTROL_HEIGHT - 1) / 2, CONTROL_HEIGHT - 1,
xpos + (CONTROL_HEIGHT - 1) / 2, CONTROL_HEIGHT - 1);
}
static void
levels_erase_slider (GdkWindow *window,
int xpos)
{
gdk_window_clear_area (window, xpos - (CONTROL_HEIGHT - 1) / 2, 0,
CONTROL_HEIGHT - 1, CONTROL_HEIGHT);
}
static void
levels_calculate_transfers (LevelsDialog *ld)
{
double inten;
int i, j;
/* Recalculate the levels arrays */
for (j = 0; j < 5; j++)
{
for (i = 0; i < 256; i++)
{
/* determine input intensity */
if (ld->high_input[j] != ld->low_input[j])
inten = (double) (i - ld->low_input[j]) /
(double) (ld->high_input[j] - ld->low_input[j]);
else
inten = (double) (i - ld->low_input[j]);
inten = BOUNDS (inten, 0.0, 1.0);
if (ld->gamma[j] != 0.0)
inten = pow (inten, (1.0 / ld->gamma[j]));
ld->input[j][i] = (unsigned char) (inten * 255.0 + 0.5);
}
}
}
static void
levels_update (LevelsDialog *ld,
int update)
{
char text[12];
int i;
/* Recalculate the transfer arrays */
levels_calculate_transfers (ld);
/* set up the lut */
levels_lut_setup(ld->lut, ld->gamma, ld->low_input, ld->high_input,
ld->low_output, ld->high_output,
gimp_drawable_bytes(ld->drawable));
if (update & LOW_INPUT)
{
gtk_spin_button_set_value (GTK_SPIN_BUTTON(ld->low_input_spin),
ld->low_input[ld->channel]);
}
if (update & GAMMA)
{
sprintf (text, "%2.2f", ld->gamma[ld->channel]);
gtk_entry_set_text (GTK_ENTRY (ld->gamma_text), text);
}
if (update & HIGH_INPUT)
{
gtk_spin_button_set_value (GTK_SPIN_BUTTON(ld->high_input_spin),
ld->high_input[ld->channel]);
}
if (update & LOW_OUTPUT)
{
gtk_spin_button_set_value (GTK_SPIN_BUTTON(ld->low_output_spin),
ld->low_output[ld->channel]);
}
if (update & HIGH_OUTPUT)
{
gtk_spin_button_set_value (GTK_SPIN_BUTTON(ld->high_output_spin),
ld->high_output[ld->channel]);
}
if (update & INPUT_LEVELS)
{
unsigned char buf[DA_WIDTH*3];
switch (ld->channel) {
default:
g_warning ("unknown channel type, can't happen\n");
/* fall through */
case HISTOGRAM_VALUE:
case HISTOGRAM_ALPHA:
for (i = 0; i < DA_WIDTH; i++)
{
buf[3*i+0] = ld->input[ld->channel][i];
buf[3*i+1] = ld->input[ld->channel][i];
buf[3*i+2] = ld->input[ld->channel][i];
}
break;
case HISTOGRAM_RED:
case HISTOGRAM_GREEN:
case HISTOGRAM_BLUE:
for (i = 0; i < DA_WIDTH; i++)
{
buf[3*i+0] = ld->input[HISTOGRAM_RED][i];
buf[3*i+1] = ld->input[HISTOGRAM_GREEN][i];
buf[3*i+2] = ld->input[HISTOGRAM_BLUE][i];
}
break;
}
for (i = 0; i < GRADIENT_HEIGHT/2; i++)
gtk_preview_draw_row (GTK_PREVIEW (ld->input_levels_da[0]),
buf, 0, i, DA_WIDTH);
for (i = 0; i < DA_WIDTH; i++)
{
buf[3*i+0] = i;
buf[3*i+1] = i;
buf[3*i+2] = i;
}
for (i = GRADIENT_HEIGHT/2; i < GRADIENT_HEIGHT; i++)
gtk_preview_draw_row (GTK_PREVIEW (ld->input_levels_da[0]),
buf, 0, i, DA_WIDTH);
if (update & DRAW)
gtk_widget_draw (ld->input_levels_da[0], NULL);
}
if (update & OUTPUT_LEVELS)
{
unsigned char buf[DA_WIDTH*3];
unsigned char r, g, b;
r = g = b = 0;
switch (ld->channel) {
default:
g_warning ("unknown channel type, can't happen\n");
/* fall through */
case HISTOGRAM_VALUE:
case HISTOGRAM_ALPHA: r = g = b = 1; break;
case HISTOGRAM_RED: r = 1; break;
case HISTOGRAM_GREEN: g = 1; break;
case HISTOGRAM_BLUE: b = 1; break;
}
for (i = 0; i < DA_WIDTH; i++)
{
buf[3*i+0] = i*r;
buf[3*i+1] = i*g;
buf[3*i+2] = i*b;
}
for (i = 0; i < GRADIENT_HEIGHT; i++)
gtk_preview_draw_row (GTK_PREVIEW (ld->output_levels_da[0]),
buf, 0, i, DA_WIDTH);
if (update & DRAW)
gtk_widget_draw (ld->output_levels_da[0], NULL);
}
if (update & INPUT_SLIDERS)
{
double width, mid, tmp;
levels_erase_slider (ld->input_levels_da[1]->window, ld->slider_pos[0]);
levels_erase_slider (ld->input_levels_da[1]->window, ld->slider_pos[1]);
levels_erase_slider (ld->input_levels_da[1]->window, ld->slider_pos[2]);
ld->slider_pos[0] = DA_WIDTH * ((double) ld->low_input[ld->channel] / 255.0);
ld->slider_pos[2] = DA_WIDTH * ((double) ld->high_input[ld->channel] / 255.0);
width = (double) (ld->slider_pos[2] - ld->slider_pos[0]) / 2.0;
mid = ld->slider_pos[0] + width;
tmp = log10 (1.0 / ld->gamma[ld->channel]);
ld->slider_pos[1] = (int) (mid + width * tmp + 0.5);
levels_draw_slider (ld->input_levels_da[1]->window,
ld->input_levels_da[1]->style->black_gc,
ld->input_levels_da[1]->style->dark_gc[GTK_STATE_NORMAL],
ld->slider_pos[1]);
levels_draw_slider (ld->input_levels_da[1]->window,
ld->input_levels_da[1]->style->black_gc,
ld->input_levels_da[1]->style->black_gc,
ld->slider_pos[0]);
levels_draw_slider (ld->input_levels_da[1]->window,
ld->input_levels_da[1]->style->black_gc,
ld->input_levels_da[1]->style->white_gc,
ld->slider_pos[2]);
}
if (update & OUTPUT_SLIDERS)
{
levels_erase_slider (ld->output_levels_da[1]->window, ld->slider_pos[3]);
levels_erase_slider (ld->output_levels_da[1]->window, ld->slider_pos[4]);
ld->slider_pos[3] = DA_WIDTH * ((double) ld->low_output[ld->channel] / 255.0);
ld->slider_pos[4] = DA_WIDTH * ((double) ld->high_output[ld->channel] / 255.0);
levels_draw_slider (ld->output_levels_da[1]->window,
ld->output_levels_da[1]->style->black_gc,
ld->output_levels_da[1]->style->black_gc,
ld->slider_pos[3]);
levels_draw_slider (ld->output_levels_da[1]->window,
ld->output_levels_da[1]->style->black_gc,
ld->output_levels_da[1]->style->white_gc,
ld->slider_pos[4]);
}
}
static void
levels_preview (LevelsDialog *ld)
{
if (!ld->image_map)
g_warning ("No image map");
active_tool->preserve = TRUE;
image_map_apply (ld->image_map, (ImageMapApplyFunc)gimp_lut_process_2,
(void *) ld->lut);
active_tool->preserve = FALSE;
}
static void
levels_value_callback (GtkWidget *w,
gpointer client_data)
{
LevelsDialog *ld;
ld = (LevelsDialog *) client_data;
if (ld->channel != HISTOGRAM_VALUE)
{
ld->channel = HISTOGRAM_VALUE;
histogram_widget_channel (ld->histogram, ld->channel);
levels_update (ld, ALL);
}
}
static void
levels_red_callback (GtkWidget *w,
gpointer client_data)
{
LevelsDialog *ld;
ld = (LevelsDialog *) client_data;
if (ld->channel != HISTOGRAM_RED)
{
ld->channel = HISTOGRAM_RED;
histogram_widget_channel (ld->histogram, ld->channel);
levels_update (ld, ALL);
}
}
static void
levels_green_callback (GtkWidget *w,
gpointer client_data)
{
LevelsDialog *ld;
ld = (LevelsDialog *) client_data;
if (ld->channel != HISTOGRAM_GREEN)
{
ld->channel = HISTOGRAM_GREEN;
histogram_widget_channel (ld->histogram, ld->channel);
levels_update (ld, ALL);
}
}
static void
levels_blue_callback (GtkWidget *w,
gpointer client_data)
{
LevelsDialog *ld;
ld = (LevelsDialog *) client_data;
if (ld->channel != HISTOGRAM_BLUE)
{
ld->channel = HISTOGRAM_BLUE;
histogram_widget_channel (ld->histogram, ld->channel);
levels_update (ld, ALL);
}
}
static void
levels_alpha_callback (GtkWidget *w,
gpointer client_data)
{
LevelsDialog *ld;
ld = (LevelsDialog *) client_data;
if (ld->channel != HISTOGRAM_ALPHA)
{
ld->channel = HISTOGRAM_ALPHA;
histogram_widget_channel (ld->histogram, ld->channel);
levels_update (ld, ALL);
}
}
static void
levels_adjust_channel (LevelsDialog *ld,
GimpHistogram *hist,
int channel)
{
int i;
double count, new_count, percentage, next_percentage;
ld->gamma[channel] = 1.0;
ld->low_output[channel] = 0;
ld->high_output[channel] = 255;
count = gimp_histogram_get_count(hist, 0, 255);
if (count == 0.0)
{
ld->low_input[channel] = 0;
ld->high_input[channel] = 0;
}
else
{
/* Set the low input */
new_count = 0.0;
for (i = 0; i < 255; i++)
{
new_count += gimp_histogram_get_value(hist, channel, i);
percentage = new_count / count;
next_percentage = (new_count + gimp_histogram_get_value(hist,
channel,
i + 1)) /
count;
if (fabs (percentage - 0.006) < fabs (next_percentage - 0.006))
{
ld->low_input[channel] = i + 1;
break;
}
}
/* Set the high input */
new_count = 0.0;
for (i = 255; i > 0; i--)
{
new_count += gimp_histogram_get_value(hist, channel, i);
percentage = new_count / count;
next_percentage = (new_count + gimp_histogram_get_value(hist,
channel,
i - 1)) / count;
if (fabs (percentage - 0.006) < fabs (next_percentage - 0.006))
{
ld->high_input[channel] = i - 1;
break;
}
}
}
}
static void
levels_auto_levels_callback (GtkWidget *widget,
gpointer client_data)
{
LevelsDialog *ld;
int channel;
ld = (LevelsDialog *) client_data;
if (ld->color)
{
/* Set the overall value to defaults */
ld->low_input[HISTOGRAM_VALUE] = 0;
ld->gamma[HISTOGRAM_VALUE] = 1.0;
ld->high_input[HISTOGRAM_VALUE] = 255;
ld->low_output[HISTOGRAM_VALUE] = 0;
ld->high_output[HISTOGRAM_VALUE] = 255;
for (channel = 0; channel < 3; channel ++)
levels_adjust_channel (ld, ld->hist, channel + 1);
}
else
levels_adjust_channel (ld, ld->hist, HISTOGRAM_VALUE);
levels_update (ld, ALL);
if (ld->preview)
levels_preview (ld);
}
static void
levels_ok_callback (GtkWidget *widget,
gpointer client_data)
{
LevelsDialog *ld;
ld = (LevelsDialog *) client_data;
if (GTK_WIDGET_VISIBLE (ld->shell))
gtk_widget_hide (ld->shell);
active_tool->preserve = TRUE;
if (!ld->preview)
{
levels_lut_setup(ld->lut, ld->gamma, ld->low_input, ld->high_input,
ld->low_output, ld->high_output,
gimp_drawable_bytes(ld->drawable));
image_map_apply (ld->image_map, (ImageMapApplyFunc)gimp_lut_process_2,
(void *) ld->lut);
}
if (ld->image_map)
image_map_commit (ld->image_map);
active_tool->preserve = FALSE;
ld->image_map = NULL;
active_tool->gdisp_ptr = NULL;
active_tool->drawable = NULL;
}
static gint
levels_delete_callback (GtkWidget *w,
GdkEvent *e,
gpointer client_data)
{
levels_cancel_callback (w, client_data);
return TRUE;
}
static void
levels_cancel_callback (GtkWidget *widget,
gpointer client_data)
{
LevelsDialog *ld;
ld = (LevelsDialog *) client_data;
if (GTK_WIDGET_VISIBLE (ld->shell))
gtk_widget_hide (ld->shell);
if (ld->image_map)
{
active_tool->preserve = TRUE;
image_map_abort (ld->image_map);
active_tool->preserve = FALSE;
gdisplays_flush ();
ld->image_map = NULL;
}
active_tool->gdisp_ptr = NULL;
active_tool->drawable = NULL;
}
static void
levels_preview_update (GtkWidget *w,
gpointer data)
{
LevelsDialog *ld;
ld = (LevelsDialog *) data;
if (GTK_TOGGLE_BUTTON (w)->active)
{
ld->preview = TRUE;
levels_preview (ld);
}
else
ld->preview = FALSE;
}
static void
levels_low_input_spin_update (GtkWidget *w,
gpointer data)
{
LevelsDialog *ld;
int value;
ld = (LevelsDialog *) data;
value = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (ld->low_input_spin));
value = BOUNDS (value, 0, ld->high_input[ld->channel]);
/* enforce a consistent displayed value (low_input <= high_input) */
gtk_spin_button_set_value(GTK_SPIN_BUTTON (ld->low_input_spin), value);
if (value != ld->low_input[ld->channel])
{
ld->low_input[ld->channel] = value;
levels_update (ld, INPUT_LEVELS | INPUT_SLIDERS | DRAW);
if (ld->preview)
levels_preview (ld);
}
}
static void
levels_gamma_text_update (GtkWidget *w,
gpointer data)
{
LevelsDialog *ld;
char *str;
double value;
str = gtk_entry_get_text (GTK_ENTRY (w));
ld = (LevelsDialog *) data;
value = BOUNDS ((atof (str)), 0.1, 10.0);
if (value != ld->gamma[ld->channel])
{
ld->gamma[ld->channel] = value;
levels_update (ld, INPUT_LEVELS | INPUT_SLIDERS | DRAW);
if (ld->preview)
levels_preview (ld);
}
}
static void
levels_high_input_spin_update (GtkWidget *w,
gpointer data)
{
LevelsDialog *ld;
int value;
ld = (LevelsDialog *) data;
value = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (ld->high_input_spin));
value = BOUNDS (value, ld->low_input[ld->channel], 255);
/* enforce a consistent displayed value (high_input >= low_input) */
gtk_spin_button_set_value(GTK_SPIN_BUTTON (ld->high_input_spin), value);
if (value != ld->high_input[ld->channel])
{
ld->high_input[ld->channel] = value;
levels_update (ld, INPUT_LEVELS | INPUT_SLIDERS | DRAW);
if (ld->preview)
levels_preview (ld);
}
}
static void
levels_low_output_spin_update (GtkWidget *w,
gpointer data)
{
LevelsDialog *ld;
int value;
ld = (LevelsDialog *) data;
value = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (ld->low_output_spin));
value = BOUNDS (value, 0, 255);
if (value != ld->low_output[ld->channel])
{
ld->low_output[ld->channel] = value;
levels_update (ld, OUTPUT_LEVELS | OUTPUT_SLIDERS | DRAW);
if (ld->preview)
levels_preview (ld);
}
}
static void
levels_high_output_spin_update (GtkWidget *w,
gpointer data)
{
LevelsDialog *ld;
int value;
ld = (LevelsDialog *) data;
value = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (ld->high_output_spin));
value = BOUNDS (value, 0, 255);
if (value != ld->high_output[ld->channel])
{
ld->high_output[ld->channel] = value;
levels_update (ld, OUTPUT_LEVELS | OUTPUT_SLIDERS | DRAW);
if (ld->preview)
levels_preview (ld);
}
}
static gint
levels_input_da_events (GtkWidget *widget,
GdkEvent *event,
LevelsDialog *ld)
{
GdkEventButton *bevent;
GdkEventMotion *mevent;
char text[12];
double width, mid, tmp;
int x, distance;
int i;
int update = FALSE;
switch (event->type)
{
case GDK_EXPOSE:
if (widget == ld->input_levels_da[1])
levels_update (ld, INPUT_SLIDERS);
break;
case GDK_BUTTON_PRESS:
gtk_grab_add (widget);
bevent = (GdkEventButton *) event;
distance = G_MAXINT;
for (i = 0; i < 3; i++)
if (fabs (bevent->x - ld->slider_pos[i]) < distance)
{
ld->active_slider = i;
distance = fabs (bevent->x - ld->slider_pos[i]);
}
x = bevent->x;
update = TRUE;
break;
case GDK_BUTTON_RELEASE:
gtk_grab_remove (widget);
switch (ld->active_slider)
{
case 0: /* low input */
levels_update (ld, LOW_INPUT | GAMMA | DRAW);
break;
case 1: /* gamma */
levels_update (ld, GAMMA);
break;
case 2: /* high input */
levels_update (ld, HIGH_INPUT | GAMMA | DRAW);
break;
}
if (ld->preview)
levels_preview (ld);
break;
case GDK_MOTION_NOTIFY:
mevent = (GdkEventMotion *) event;
gdk_window_get_pointer (widget->window, &x, NULL, NULL);
update = TRUE;
break;
default:
break;
}
if (update)
{
switch (ld->active_slider)
{
case 0: /* low input */
ld->low_input[ld->channel] = ((double) x / (double) DA_WIDTH) * 255.0;
ld->low_input[ld->channel] = BOUNDS (ld->low_input[ld->channel], 0,
ld->high_input[ld->channel]);
break;
case 1: /* gamma */
width = (double) (ld->slider_pos[2] - ld->slider_pos[0]) / 2.0;
mid = ld->slider_pos[0] + width;
x = BOUNDS (x, ld->slider_pos[0], ld->slider_pos[2]);
tmp = (double) (x - mid) / width;
ld->gamma[ld->channel] = 1.0 / pow (10, tmp);
/* round the gamma value to the nearest 1/100th */
sprintf (text, "%2.2f", ld->gamma[ld->channel]);
ld->gamma[ld->channel] = atof (text);
break;
case 2: /* high input */
ld->high_input[ld->channel] = ((double) x / (double) DA_WIDTH) * 255.0;
ld->high_input[ld->channel] = BOUNDS (ld->high_input[ld->channel],
ld->low_input[ld->channel], 255);
break;
}
levels_update (ld, INPUT_SLIDERS | INPUT_LEVELS | DRAW);
}
return FALSE;
}
static gint
levels_output_da_events (GtkWidget *widget,
GdkEvent *event,
LevelsDialog *ld)
{
GdkEventButton *bevent;
GdkEventMotion *mevent;
int x, distance;
int i;
int update = FALSE;
switch (event->type)
{
case GDK_EXPOSE:
if (widget == ld->output_levels_da[1])
levels_update (ld, OUTPUT_SLIDERS);
break;
case GDK_BUTTON_PRESS:
bevent = (GdkEventButton *) event;
distance = G_MAXINT;
for (i = 3; i < 5; i++)
if (fabs (bevent->x - ld->slider_pos[i]) < distance)
{
ld->active_slider = i;
distance = fabs (bevent->x - ld->slider_pos[i]);
}
x = bevent->x;
update = TRUE;
break;
case GDK_BUTTON_RELEASE:
switch (ld->active_slider)
{
case 3: /* low output */
levels_update (ld, LOW_OUTPUT | DRAW);
break;
case 4: /* high output */
levels_update (ld, HIGH_OUTPUT | DRAW);
break;
}
if (ld->preview)
levels_preview (ld);
break;
case GDK_MOTION_NOTIFY:
mevent = (GdkEventMotion *) event;
gdk_window_get_pointer (widget->window, &x, NULL, NULL);
update = TRUE;
break;
default:
break;
}
if (update)
{
switch (ld->active_slider)
{
case 3: /* low output */
ld->low_output[ld->channel] = ((double) x / (double) DA_WIDTH) * 255.0;
ld->low_output[ld->channel] = BOUNDS (ld->low_output[ld->channel], 0, 255);
break;
case 4: /* high output */
ld->high_output[ld->channel] = ((double) x / (double) DA_WIDTH) * 255.0;
ld->high_output[ld->channel] = BOUNDS (ld->high_output[ld->channel], 0, 255);
break;
}
levels_update (ld, OUTPUT_SLIDERS | DRAW);
}
return FALSE;
}
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