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gimp/app/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 "histogram.h"
#include "image_map.h"
#include "interface.h"
#include "levels.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
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_text;
GtkWidget * gamma_text;
GtkWidget * high_input_text;
GtkWidget * low_output_text;
GtkWidget * high_output_text;
GtkWidget * input_levels_da[2];
GtkWidget * output_levels_da[2];
GtkWidget * channel_menu;
Histogram * histogram;
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];
unsigned char output[5][256];
};
/* levels action functions */
static void levels_button_press (Tool *, GdkEventButton *, gpointer);
static void levels_button_release (Tool *, GdkEventButton *, gpointer);
static void levels_motion (Tool *, GdkEventMotion *, gpointer);
static void levels_cursor_update (Tool *, GdkEventMotion *, gpointer);
static void levels_control (Tool *, int, 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_text_update (GtkWidget *, gpointer);
static void levels_gamma_text_update (GtkWidget *, gpointer);
static void levels_high_input_text_update (GtkWidget *, gpointer);
static void levels_low_output_text_update (GtkWidget *, gpointer);
static void levels_high_output_text_update (GtkWidget *, gpointer);
static gint levels_input_da_events (GtkWidget *, GdkEvent *, LevelsDialog *);
static gint levels_output_da_events (GtkWidget *, GdkEvent *, LevelsDialog *);
static void *levels_options = NULL;
static LevelsDialog *levels_dialog = NULL;
static void levels (PixelRegion *, PixelRegion *, void *);
static void levels_histogram_info (PixelRegion *, PixelRegion *, HistogramValues, void *);
static void levels_histogram_range (int, int, HistogramValues, void *);
static Argument * levels_invoker (Argument *);
/* levels machinery */
static void
levels (PixelRegion *srcPR,
PixelRegion *destPR,
void *user_data)
{
LevelsDialog *ld;
unsigned char *src, *s;
unsigned char *dest, *d;
int has_alpha, alpha;
int w, h;
ld = (LevelsDialog *) user_data;
h = srcPR->h;
src = srcPR->data;
dest = destPR->data;
has_alpha = (srcPR->bytes == 2 || srcPR->bytes == 4);
alpha = has_alpha ? srcPR->bytes - 1 : srcPR->bytes;
while (h--)
{
w = srcPR->w;
s = src;
d = dest;
while (w--)
{
if (ld->color)
{
/* The contributions from the individual channel level settings */
d[RED_PIX] = ld->output[HISTOGRAM_RED][ld->input[HISTOGRAM_RED][s[RED_PIX]]];
d[GREEN_PIX] = ld->output[HISTOGRAM_GREEN][ld->input[HISTOGRAM_GREEN][s[GREEN_PIX]]];
d[BLUE_PIX] = ld->output[HISTOGRAM_BLUE][ld->input[HISTOGRAM_BLUE][s[BLUE_PIX]]];
/* The overall changes */
d[RED_PIX] = ld->output[HISTOGRAM_VALUE][ld->input[HISTOGRAM_VALUE][d[RED_PIX]]];
d[GREEN_PIX] = ld->output[HISTOGRAM_VALUE][ld->input[HISTOGRAM_VALUE][d[GREEN_PIX]]];
d[BLUE_PIX] = ld->output[HISTOGRAM_VALUE][ld->input[HISTOGRAM_VALUE][d[BLUE_PIX]]];
}
else
d[GRAY_PIX] = ld->output[HISTOGRAM_VALUE][ld->input[HISTOGRAM_VALUE][s[GRAY_PIX]]];;
if (has_alpha)
d[alpha] = ld->output[HISTOGRAM_ALPHA][ld->input[HISTOGRAM_ALPHA][s[alpha]]];
/*d[alpha] = s[alpha];*/
s += srcPR->bytes;
d += destPR->bytes;
}
src += srcPR->rowstride;
dest += destPR->rowstride;
}
}
static void
levels_histogram_info (PixelRegion *srcPR,
PixelRegion *maskPR,
HistogramValues values,
void *user_data)
{
LevelsDialog *ld;
unsigned char *src, *s;
unsigned char *mask, *m;
int w, h;
int value, red, green, blue;
int has_alpha, alpha;
mask = NULL;
m = NULL;
ld = (LevelsDialog *) user_data;
h = srcPR->h;
src = srcPR->data;
has_alpha = (srcPR->bytes == 2 || srcPR->bytes == 4);
alpha = has_alpha ? srcPR->bytes - 1 : srcPR->bytes;
if (maskPR)
mask = maskPR->data;
while (h--)
{
w = srcPR->w;
s = src;
if (maskPR)
m = mask;
while (w--)
{
if (ld->color)
{
value = MAX (s[RED_PIX], s[GREEN_PIX]);
value = MAX (value, s[BLUE_PIX]);
red = s[RED_PIX];
green = s[GREEN_PIX];
blue = s[BLUE_PIX];
alpha = s[ALPHA_PIX];
if (maskPR)
{
values[HISTOGRAM_VALUE][value] += (double) *m / 255.0;
values[HISTOGRAM_RED][red] += (double) *m / 255.0;
values[HISTOGRAM_GREEN][green] += (double) *m / 255.0;
values[HISTOGRAM_BLUE][blue] += (double) *m / 255.0;
}
else
{
values[HISTOGRAM_VALUE][value] += 1.0;
values[HISTOGRAM_RED][red] += 1.0;
values[HISTOGRAM_GREEN][green] += 1.0;
values[HISTOGRAM_BLUE][blue] += 1.0;
}
}
else
{
value = s[GRAY_PIX];
if (maskPR)
values[HISTOGRAM_VALUE][value] += (double) *m / 255.0;
else
values[HISTOGRAM_VALUE][value] += 1.0;
}
if (has_alpha)
{
if (maskPR)
values[HISTOGRAM_ALPHA][s[alpha]] += (double) *m / 255.0;
else
values[HISTOGRAM_ALPHA][s[alpha]] += 1.0;
}
s += srcPR->bytes;
if (maskPR)
m += maskPR->bytes;
}
src += srcPR->rowstride;
if (maskPR)
mask += maskPR->rowstride;
}
}
static void
levels_histogram_range (int start,
int end,
HistogramValues values,
void *user_data)
{
LevelsDialog *ld;
ld = (LevelsDialog *) user_data;
histogram_range (ld->histogram, -1, -1);
}
/* levels action functions */
static void
levels_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
gdisp = gdisp_ptr;
tool->drawable = gimage_active_drawable (gdisp->gimage);
}
static void
levels_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
}
static void
levels_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
}
static void
levels_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
levels_control (Tool *tool,
int action,
gpointer gdisp_ptr)
{
Levels * _levels;
_levels = (Levels *) tool->private;
switch (action)
{
case PAUSE :
break;
case RESUME :
break;
case HALT :
if (levels_dialog)
{
active_tool->preserve = TRUE;
image_map_abort (levels_dialog->image_map);
active_tool->preserve = FALSE;
levels_dialog->image_map = NULL;
levels_cancel_callback (NULL, (gpointer) levels_dialog);
}
break;
}
}
Tool *
tools_new_levels ()
{
Tool * tool;
Levels * private;
/* The tool options */
if (!levels_options)
levels_options = tools_register_no_options (LEVELS, "Levels Options");
tool = (Tool *) g_malloc (sizeof (Tool));
private = (Levels *) g_malloc (sizeof (Levels));
tool->type = LEVELS;
tool->state = INACTIVE;
tool->scroll_lock = 1; /* Disallow scrolling */
tool->auto_snap_to = TRUE;
tool->private = (void *) private;
tool->button_press_func = levels_button_press;
tool->button_release_func = levels_button_release;
tool->motion_func = levels_motion;
tool->arrow_keys_func = standard_arrow_keys_func;
tool->cursor_update_func = levels_cursor_update;
tool->control_func = levels_control;
tool->preserve = FALSE;
tool->gdisp_ptr = NULL;
tool->drawable = NULL;
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[] =
{
{ "Value", 0, 0, levels_value_callback, NULL, NULL, NULL },
{ "Red", 0, 0, levels_red_callback, NULL, NULL, NULL },
{ "Green", 0, 0, levels_green_callback, NULL, NULL, NULL },
{ "Blue", 0, 0, levels_blue_callback, NULL, NULL, NULL },
{ "Alpha", 0, 0, levels_alpha_callback, NULL, NULL, NULL },
{ NULL, 0, 0, NULL, NULL, NULL, NULL }
};
void
levels_initialize (void *gdisp_ptr)
{
GDisplay *gdisp;
int i;
gdisp = (GDisplay *) gdisp_ptr;
if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
{
message_box ("Levels for indexed drawables cannot be adjusted.", NULL, NULL);
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_ptr, 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);
histogram_update (levels_dialog->histogram,
levels_dialog->drawable,
levels_histogram_info,
(void *) levels_dialog);
histogram_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);
}
}
/****************************/
/* Select by Color dialog */
/****************************/
/* the action area structure */
static ActionAreaItem action_items[] =
{
{ "Auto Levels", levels_auto_levels_callback, NULL, NULL },
{ "OK", levels_ok_callback, NULL, NULL },
{ "Cancel", levels_cancel_callback, NULL, NULL }
};
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;
ld = g_malloc (sizeof (LevelsDialog));
ld->preview = TRUE;
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_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 widget */
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 text */
ld->low_input_text = gtk_entry_new ();
gtk_entry_set_text (GTK_ENTRY (ld->low_input_text), "0");
gtk_widget_set_usize (ld->low_input_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), ld->low_input_text, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (ld->low_input_text), "changed",
(GtkSignalFunc) levels_low_input_text_update,
ld);
gtk_widget_show (ld->low_input_text);
/* 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 text */
ld->high_input_text = gtk_entry_new ();
gtk_entry_set_text (GTK_ENTRY (ld->high_input_text), "255");
gtk_widget_set_usize (ld->high_input_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), ld->high_input_text, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (ld->high_input_text), "changed",
(GtkSignalFunc) levels_high_input_text_update,
ld);
gtk_widget_show (ld->high_input_text);
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_create (HISTOGRAM_WIDTH, HISTOGRAM_HEIGHT,
levels_histogram_range, (void *) ld);
gtk_container_add (GTK_CONTAINER (frame), ld->histogram->histogram_widget);
gtk_widget_show (ld->histogram->histogram_widget);
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_GRAYSCALE);
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 text widget */
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 text */
ld->low_output_text = gtk_entry_new ();
gtk_entry_set_text (GTK_ENTRY (ld->low_output_text), "0");
gtk_widget_set_usize (ld->low_output_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), ld->low_output_text, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (ld->low_output_text), "changed",
(GtkSignalFunc) levels_low_output_text_update,
ld);
gtk_widget_show (ld->low_output_text);
/* high output text */
ld->high_output_text = gtk_entry_new ();
gtk_entry_set_text (GTK_ENTRY (ld->high_output_text), "255");
gtk_widget_set_usize (ld->high_output_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), ld->high_output_text, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (ld->high_output_text), "changed",
(GtkSignalFunc) levels_high_output_text_update,
ld);
gtk_widget_show (ld->high_output_text);
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_GRAYSCALE);
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_state (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);
/* determine the output intensity */
inten = (double) i / 255.0;
if (ld->high_output[j] >= ld->low_output[j])
inten = (double) (inten * (ld->high_output[j] - ld->low_output[j]) +
ld->low_output[j]);
else if (ld->high_output[j] < ld->low_output[j])
inten = (double) (ld->low_output[j] - inten *
(ld->low_output[j] - ld->high_output[j]));
inten = BOUNDS (inten, 0.0, 255.0);
ld->output[j][i] = (unsigned char) (inten + 0.5);
}
}
}
static void
levels_update (LevelsDialog *ld,
int update)
{
char text[12];
int i;
/* Recalculate the transfer arrays */
levels_calculate_transfers (ld);
if (update & LOW_INPUT)
{
sprintf (text, "%d", ld->low_input[ld->channel]);
gtk_entry_set_text (GTK_ENTRY (ld->low_input_text), text);
}
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)
{
sprintf (text, "%d", ld->high_input[ld->channel]);
gtk_entry_set_text (GTK_ENTRY (ld->high_input_text), text);
}
if (update & LOW_OUTPUT)
{
sprintf (text, "%d", ld->low_output[ld->channel]);
gtk_entry_set_text (GTK_ENTRY (ld->low_output_text), text);
}
if (update & HIGH_OUTPUT)
{
sprintf (text, "%d", ld->high_output[ld->channel]);
gtk_entry_set_text (GTK_ENTRY (ld->high_output_text), text);
}
if (update & INPUT_LEVELS)
{
for (i = 0; i < GRADIENT_HEIGHT; i++)
gtk_preview_draw_row (GTK_PREVIEW (ld->input_levels_da[0]),
ld->input[ld->channel], 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];
for (i = 0; i < DA_WIDTH; i++)
buf[i] = i;
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, levels, (void *) ld);
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_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_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_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_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_channel (ld->histogram, ld->channel);
levels_update (ld, ALL);
}
}
static void
levels_adjust_channel (LevelsDialog *ld,
HistogramValues *values,
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 = 0.0;
for (i = 0; i < 256; i++)
count += (*values)[channel][i];
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 += (*values)[channel][i];
percentage = new_count / count;
next_percentage = (new_count + (*values)[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 += (*values)[channel][i];
percentage = new_count / count;
next_percentage = (new_count + (*values)[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;
HistogramValues *values;
int channel;
ld = (LevelsDialog *) client_data;
values = histogram_values (ld->histogram);
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, values, channel + 1);
}
else
levels_adjust_channel (ld, values, 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)
image_map_apply (ld->image_map, levels, (void *) ld);
if (ld->image_map)
image_map_commit (ld->image_map);
active_tool->preserve = FALSE;
ld->image_map = 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 = TRUE;
gdisplays_flush ();
}
ld->image_map = 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_text_update (GtkWidget *w,
gpointer data)
{
LevelsDialog *ld;
char *str;
int value;
str = gtk_entry_get_text (GTK_ENTRY (w));
ld = (LevelsDialog *) data;
value = BOUNDS (((int) atof (str)), 0, ld->high_input[ld->channel]);
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_text_update (GtkWidget *w,
gpointer data)
{
LevelsDialog *ld;
char *str;
int value;
str = gtk_entry_get_text (GTK_ENTRY (w));
ld = (LevelsDialog *) data;
value = BOUNDS (((int) atof (str)), ld->low_input[ld->channel], 255);
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_text_update (GtkWidget *w,
gpointer data)
{
LevelsDialog *ld;
char *str;
int value;
str = gtk_entry_get_text (GTK_ENTRY (w));
ld = (LevelsDialog *) data;
value = BOUNDS (((int) atof (str)), 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_text_update (GtkWidget *w,
gpointer data)
{
LevelsDialog *ld;
char *str;
int value;
str = gtk_entry_get_text (GTK_ENTRY (w));
ld = (LevelsDialog *) data;
value = BOUNDS (((int) atof (str)), 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;
}
/* The levels procedure definition */
ProcArg levels_args[] =
{
{ PDB_IMAGE,
"image",
"the image"
},
{ PDB_DRAWABLE,
"drawable",
"the drawable"
},
{ PDB_INT32,
"channel",
"the channel to modify: { VALUE (0), RED (1), GREEN (2), BLUE (3), GRAY (0) }"
},
{ PDB_INT32,
"low_input",
"intensity of lowest input: (0 <= low_input <= 255)"
},
{ PDB_INT32,
"high_input",
"intensity of highest input: (0 <= high_input <= 255)"
},
{ PDB_FLOAT,
"gamma",
"gamma correction factor: (0.1 <= gamma <= 10)"
},
{ PDB_INT32,
"low_output",
"intensity of lowest output: (0 <= low_input <= 255)"
},
{ PDB_INT32,
"high_output",
"intensity of highest output: (0 <= high_input <= 255)"
}
};
ProcRecord levels_proc =
{
"gimp_levels",
"Modifies intensity levels in the specified drawable",
"This tool allows intensity levels in the specified drawable to be remapped according to a set of parameters. The low/high input levels specify an initial mapping from the source intensities. The gamma value determines how intensities between the low and high input intensities are interpolated. A gamma value of 1.0 results in a linear interpolation. Higher gamma values result in more high-level intensities. Lower gamma values result in more low-level intensities. The low/high output levels constrain the final intensity mapping--that is, no final intensity will be lower than the low output level and no final intensity will be higher than the high output level. This tool is only valid on RGB color and grayscale images. It will not operate on indexed drawables.",
"Spencer Kimball & Peter Mattis",
"Spencer Kimball & Peter Mattis",
"1995-1996",
PDB_INTERNAL,
/* Input arguments */
8,
levels_args,
/* Output arguments */
0,
NULL,
/* Exec method */
{ { levels_invoker } },
};
static Argument *
levels_invoker (Argument *args)
{
PixelRegion srcPR, destPR;
int success = TRUE;
LevelsDialog ld;
GImage *gimage;
GimpDrawable *drawable;
int channel;
int low_input;
int high_input;
double gamma;
int low_output;
int high_output;
int int_value;
double fp_value;
int x1, y1, x2, y2;
int i;
void *pr;
drawable = NULL;
low_input = 0;
high_input = 0;
gamma = 1.0;
low_output = 0;
high_output = 0;
/* the gimage */
if (success)
{
int_value = args[0].value.pdb_int;
if (! (gimage = gimage_get_ID (int_value)))
success = FALSE;
}
/* the drawable */
if (success)
{
int_value = args[1].value.pdb_int;
drawable = drawable_get_ID (int_value);
if (drawable == NULL || gimage != drawable_gimage (drawable))
success = FALSE;
}
/* make sure the drawable is not indexed color */
if (success)
success = ! drawable_indexed (drawable);
/* channel */
if (success)
{
int_value = args[2].value.pdb_int;
if (success)
{
if (drawable_gray (drawable))
{
if (int_value != 0)
success = FALSE;
}
else if (drawable_color (drawable))
{
if (int_value < 0 || int_value > 3)
success = FALSE;
}
else
success = FALSE;
}
channel = int_value;
}
/* low input */
if (success)
{
int_value = args[3].value.pdb_int;
if (int_value >= 0 && int_value < 256)
low_input = int_value;
else
success = FALSE;
}
/* high input */
if (success)
{
int_value = args[4].value.pdb_int;
if (int_value >= 0 && int_value < 256)
high_input = int_value;
else
success = FALSE;
}
/* gamma */
if (success)
{
fp_value = args[5].value.pdb_float;
if (fp_value >= 0.1 && fp_value <= 10.0)
gamma = fp_value;
else
success = FALSE;
}
/* low output */
if (success)
{
int_value = args[6].value.pdb_int;
if (int_value >= 0 && int_value < 256)
low_output = int_value;
else
success = FALSE;
}
/* high output */
if (success)
{
int_value = args[7].value.pdb_int;
if (int_value >= 0 && int_value < 256)
high_output = int_value;
else
success = FALSE;
}
/* arrange to modify the levels */
if (success)
{
for (i = 0; i < 5; i++)
{
ld.low_input[i] = 0;
ld.gamma[i] = 1.0;
ld.high_input[i] = 255;
ld.low_output[i] = 0;
ld.high_output[i] = 255;
}
ld.channel = channel;
ld.color = drawable_color (drawable);
ld.low_input[channel] = low_input;
ld.high_input[channel] = high_input;
ld.gamma[channel] = gamma;
ld.low_output[channel] = low_output;
ld.high_output[channel] = high_output;
/* calculate the transfer arrays */
levels_calculate_transfers (&ld);
/* 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))
levels (&srcPR, &destPR, (void *) &ld);
drawable_merge_shadow (drawable, TRUE);
drawable_update (drawable, x1, y1, (x2 - x1), (y2 - y1));
}
return procedural_db_return_args (&levels_proc, success);
}
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