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gimp/app/tools/gimplevelstool.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 "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "base/gimphistogram.h"
#include "base/gimplut.h"
#include "base/levels.h"
#include "core/gimp.h"
#include "core/gimpdrawable.h"
#include "core/gimpdrawable-histogram.h"
#include "core/gimpimage.h"
#include "core/gimpimagemap.h"
#include "core/gimptoolinfo.h"
#include "widgets/gimpcolorbar.h"
#include "widgets/gimphelp-ids.h"
#include "widgets/gimphistogramview.h"
#include "display/gimpdisplay.h"
#include "gimphistogramoptions.h"
#include "gimplevelstool.h"
#include "gimptoolcontrol.h"
#include "gimp-intl.h"
#define LOW_INPUT (1 << 0)
#define GAMMA (1 << 1)
#define HIGH_INPUT (1 << 2)
#define LOW_OUTPUT (1 << 3)
#define HIGH_OUTPUT (1 << 4)
#define INPUT_LEVELS (1 << 5)
#define OUTPUT_LEVELS (1 << 6)
#define INPUT_SLIDERS (1 << 7)
#define OUTPUT_SLIDERS (1 << 8)
#define ALL_CHANNELS (1 << 9)
#define ALL 0xFFF
#define HISTOGRAM_WIDTH 256
#define GRADIENT_HEIGHT 12
#define CONTROL_HEIGHT 8
#define LEVELS_EVENT_MASK (GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON_MOTION_MASK)
/* local function prototypes */
static void gimp_levels_tool_finalize (GObject *object);
static gboolean gimp_levels_tool_initialize (GimpTool *tool,
GimpDisplay *display);
static void gimp_levels_tool_color_picked (GimpColorTool *color_tool,
GimpColorPickState pick_state,
GimpImageType sample_type,
GimpRGB *color,
gint color_index);
static void gimp_levels_tool_map (GimpImageMapTool *image_map_tool);
static void gimp_levels_tool_dialog (GimpImageMapTool *image_map_tool);
static void gimp_levels_tool_reset (GimpImageMapTool *image_map_tool);
static gboolean gimp_levels_tool_settings_load (GimpImageMapTool *image_mao_tool,
gpointer fp);
static gboolean gimp_levels_tool_settings_save (GimpImageMapTool *image_map_tool,
gpointer fp);
static void levels_update (GimpLevelsTool *tool,
guint update);
static void levels_channel_callback (GtkWidget *widget,
GimpLevelsTool *tool);
static void levels_channel_reset_callback (GtkWidget *widget,
GimpLevelsTool *tool);
static gboolean levels_menu_sensitivity (gint value,
gpointer data);
static void levels_stretch_callback (GtkWidget *widget,
GimpLevelsTool *tool);
static void levels_low_input_adjustment_update (GtkAdjustment *adjustment,
GimpLevelsTool *tool);
static void levels_gamma_adjustment_update (GtkAdjustment *adjustment,
GimpLevelsTool *tool);
static void levels_high_input_adjustment_update (GtkAdjustment *adjustment,
GimpLevelsTool *tool);
static void levels_low_output_adjustment_update (GtkAdjustment *adjustment,
GimpLevelsTool *tool);
static void levels_high_output_adjustment_update (GtkAdjustment *adjustment,
GimpLevelsTool *tool);
static void levels_input_picker_toggled (GtkWidget *widget,
GimpLevelsTool *tool);
static gint levels_input_area_event (GtkWidget *widget,
GdkEvent *event,
GimpLevelsTool *tool);
static gboolean levels_input_area_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpLevelsTool *tool);
static gint levels_output_area_event (GtkWidget *widget,
GdkEvent *event,
GimpLevelsTool *tool);
static gboolean levels_output_area_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpLevelsTool *tool);
G_DEFINE_TYPE (GimpLevelsTool, gimp_levels_tool, GIMP_TYPE_IMAGE_MAP_TOOL)
#define parent_class gimp_levels_tool_parent_class
void
gimp_levels_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_LEVELS_TOOL,
GIMP_TYPE_HISTOGRAM_OPTIONS,
gimp_color_options_gui,
0,
"gimp-levels-tool",
_("Levels"),
_("Adjust color levels"),
N_("_Levels..."), NULL,
NULL, GIMP_HELP_TOOL_LEVELS,
GIMP_STOCK_TOOL_LEVELS,
data);
}
static void
gimp_levels_tool_class_init (GimpLevelsToolClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpToolClass *tool_class = GIMP_TOOL_CLASS (klass);
GimpColorToolClass *color_tool_class = GIMP_COLOR_TOOL_CLASS (klass);
GimpImageMapToolClass *im_tool_class = GIMP_IMAGE_MAP_TOOL_CLASS (klass);
object_class->finalize = gimp_levels_tool_finalize;
tool_class->initialize = gimp_levels_tool_initialize;
color_tool_class->picked = gimp_levels_tool_color_picked;
im_tool_class->shell_desc = _("Adjust Color Levels");
im_tool_class->settings_name = "levels";
im_tool_class->load_dialog_title = _("Load Levels");
im_tool_class->load_button_tip = _("Load levels settings from file");
im_tool_class->save_dialog_title = _("Save Levels");
im_tool_class->save_button_tip = _("Save levels settings to file");
im_tool_class->map = gimp_levels_tool_map;
im_tool_class->dialog = gimp_levels_tool_dialog;
im_tool_class->reset = gimp_levels_tool_reset;
im_tool_class->settings_load = gimp_levels_tool_settings_load;
im_tool_class->settings_save = gimp_levels_tool_settings_save;
}
static void
gimp_levels_tool_init (GimpLevelsTool *tool)
{
tool->lut = gimp_lut_new ();
tool->levels = g_new0 (Levels, 1);
tool->hist = NULL;
tool->channel = GIMP_HISTOGRAM_VALUE;
tool->active_picker = NULL;
levels_init (tool->levels);
}
static void
gimp_levels_tool_finalize (GObject *object)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (object);
if (tool->lut)
{
gimp_lut_free (tool->lut);
tool->lut = NULL;
}
if (tool->levels)
{
g_free (tool->levels);
tool->levels = NULL;
}
if (tool->hist)
{
gimp_histogram_free (tool->hist);
tool->hist = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gimp_levels_tool_initialize (GimpTool *tool,
GimpDisplay *display)
{
GimpLevelsTool *l_tool = GIMP_LEVELS_TOOL (tool);
GimpDrawable *drawable;
drawable = gimp_image_active_drawable (display->image);
if (! drawable)
return FALSE;
if (gimp_drawable_is_indexed (drawable))
{
g_message (_("Levels for indexed layers cannot be adjusted."));
return FALSE;
}
if (! l_tool->hist)
l_tool->hist = gimp_histogram_new ();
levels_init (l_tool->levels);
l_tool->channel = GIMP_HISTOGRAM_VALUE;
l_tool->color = gimp_drawable_is_rgb (drawable);
l_tool->alpha = gimp_drawable_has_alpha (drawable);
if (l_tool->active_picker)
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (l_tool->active_picker),
FALSE);
GIMP_TOOL_CLASS (parent_class)->initialize (tool, display);
gimp_int_combo_box_set_sensitivity (GIMP_INT_COMBO_BOX (l_tool->channel_menu),
levels_menu_sensitivity, l_tool, NULL);
gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (l_tool->channel_menu),
l_tool->channel);
/* FIXME: hack */
if (! l_tool->color)
l_tool->channel = (l_tool->channel == GIMP_HISTOGRAM_ALPHA) ? 1 : 0;
levels_update (l_tool, ALL);
gimp_drawable_calculate_histogram (drawable, l_tool->hist);
gimp_histogram_view_set_histogram (GIMP_HISTOGRAM_VIEW (l_tool->hist_view),
l_tool->hist);
return TRUE;
}
static void
gimp_levels_tool_map (GimpImageMapTool *image_map_tool)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (image_map_tool);
gimp_image_map_apply (image_map_tool->image_map,
(GimpImageMapApplyFunc) gimp_lut_process,
tool->lut);
}
/*******************/
/* Levels dialog */
/*******************/
static GtkWidget *
gimp_levels_tool_color_picker_new (GimpLevelsTool *tool,
guint value)
{
GtkWidget *button;
GtkWidget *image;
const gchar *stock_id;
const gchar *help;
switch (value & 0xF)
{
case LOW_INPUT:
stock_id = GIMP_STOCK_COLOR_PICKER_BLACK;
help = _("Pick black point");
break;
case GAMMA:
stock_id = GIMP_STOCK_COLOR_PICKER_GRAY;
help = _("Pick gray point");
break;
case HIGH_INPUT:
stock_id = GIMP_STOCK_COLOR_PICKER_WHITE;
help = _("Pick white point");
break;
default:
return NULL;
}
button = g_object_new (GTK_TYPE_TOGGLE_BUTTON,
"draw-indicator", FALSE,
NULL);
image = gtk_image_new_from_stock (stock_id, GTK_ICON_SIZE_BUTTON);
gtk_misc_set_padding (GTK_MISC (image), 2, 2);
gtk_container_add (GTK_CONTAINER (button), image);
gtk_widget_show (image);
gimp_help_set_help_data (button, help, NULL);
g_object_set_data (G_OBJECT (button),
"pick_value", GUINT_TO_POINTER (value));
g_signal_connect (button, "toggled",
G_CALLBACK (levels_input_picker_toggled),
tool);
return button;
}
static void
gimp_levels_tool_dialog (GimpImageMapTool *image_map_tool)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (image_map_tool);
GimpToolOptions *tool_options;
GtkListStore *store;
GtkWidget *vbox;
GtkWidget *vbox2;
GtkWidget *vbox3;
GtkWidget *hbox;
GtkWidget *hbox2;
GtkWidget *label;
GtkWidget *menu;
GtkWidget *frame;
GtkWidget *hbbox;
GtkWidget *button;
GtkWidget *spinbutton;
GtkWidget *bar;
GtkObject *data;
gint border;
tool_options = GIMP_TOOL (tool)->tool_info->tool_options;
vbox = image_map_tool->main_vbox;
/* The option menu for selecting channels */
hbox = gtk_hbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
label = gtk_label_new_with_mnemonic (_("Cha_nnel:"));
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
store = gimp_enum_store_new_with_range (GIMP_TYPE_HISTOGRAM_CHANNEL,
GIMP_HISTOGRAM_VALUE,
GIMP_HISTOGRAM_ALPHA);
menu = gimp_enum_combo_box_new_with_model (GIMP_ENUM_STORE (store));
g_object_unref (store);
g_signal_connect (menu, "changed",
G_CALLBACK (levels_channel_callback),
tool);
gimp_enum_combo_box_set_stock_prefix (GIMP_ENUM_COMBO_BOX (menu),
"gimp-channel");
gtk_box_pack_start (GTK_BOX (hbox), menu, FALSE, FALSE, 0);
gtk_widget_show (menu);
tool->channel_menu = menu;
gtk_label_set_mnemonic_widget (GTK_LABEL (label), menu);
button = gtk_button_new_with_mnemonic (_("R_eset Channel"));
gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
g_signal_connect (button, "clicked",
G_CALLBACK (levels_channel_reset_callback),
tool);
menu = gimp_prop_enum_stock_box_new (G_OBJECT (tool_options),
"histogram-scale", "gimp-histogram",
0, 0);
gtk_box_pack_end (GTK_BOX (hbox), menu, FALSE, FALSE, 0);
gtk_widget_show (menu);
/* Input levels frame */
frame = gimp_frame_new (_("Input Levels"));
gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
vbox2 = gtk_vbox_new (FALSE, 2);
gtk_container_add (GTK_CONTAINER (frame), vbox2);
gtk_widget_show (vbox2);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (vbox2), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
tool->hist_view = gimp_histogram_view_new (FALSE);
gtk_container_add (GTK_CONTAINER (frame), tool->hist_view);
gtk_widget_show (GTK_WIDGET (tool->hist_view));
gimp_histogram_options_connect_view (GIMP_HISTOGRAM_OPTIONS (tool_options),
GIMP_HISTOGRAM_VIEW (tool->hist_view));
g_object_get (tool->hist_view, "border-width", &border, NULL);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (vbox2), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
tool->input_area = gtk_event_box_new ();
gtk_widget_set_size_request (tool->input_area, -1,
GRADIENT_HEIGHT + CONTROL_HEIGHT);
gtk_widget_add_events (tool->input_area, LEVELS_EVENT_MASK);
gtk_container_add (GTK_CONTAINER (frame), tool->input_area);
gtk_widget_show (tool->input_area);
g_signal_connect (tool->input_area, "event",
G_CALLBACK (levels_input_area_event),
tool);
g_signal_connect_after (tool->input_area, "expose-event",
G_CALLBACK (levels_input_area_expose),
tool);
vbox3 = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (tool->input_area), vbox3);
gtk_widget_show (vbox3);
tool->input_bar = g_object_new (GIMP_TYPE_COLOR_BAR,
"xpad", border,
"ypad", 0,
NULL);
gtk_widget_set_size_request (tool->input_bar, -1, GRADIENT_HEIGHT / 2);
gtk_box_pack_start (GTK_BOX (vbox3), tool->input_bar, FALSE, FALSE, 0);
gtk_widget_show (tool->input_bar);
bar = g_object_new (GIMP_TYPE_COLOR_BAR,
"xpad", border,
"ypad", 0,
NULL);
gtk_widget_set_size_request (bar, -1, GRADIENT_HEIGHT / 2);
gtk_box_pack_start (GTK_BOX (vbox3), bar, FALSE, FALSE, 0);
gtk_widget_show (bar);
/* Horizontal box for input levels spinbuttons */
hbox = gtk_hbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (vbox2), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
/* low input spin */
hbox2 = gtk_hbox_new (FALSE, 2);
gtk_box_pack_start (GTK_BOX (hbox), hbox2, FALSE, FALSE, 0);
gtk_widget_show (hbox2);
button = gimp_levels_tool_color_picker_new (tool, LOW_INPUT);
gtk_box_pack_start (GTK_BOX (hbox2), button, FALSE, FALSE, 0);
gtk_widget_show (button);
spinbutton = gimp_spin_button_new (&data, 0, 0, 255, 1, 10, 10, 0.5, 0);
gtk_box_pack_start (GTK_BOX (hbox2), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
tool->low_input = GTK_ADJUSTMENT (data);
g_signal_connect (tool->low_input, "value-changed",
G_CALLBACK (levels_low_input_adjustment_update),
tool);
/* input gamma spin */
spinbutton = gimp_spin_button_new (&data, 1, 0.1, 10, 0.01, 0.1, 1, 0.5, 2);
gtk_box_pack_start (GTK_BOX (hbox), spinbutton, TRUE, FALSE, 0);
gimp_help_set_help_data (spinbutton, _("Gamma"), NULL);
gtk_widget_show (spinbutton);
tool->gamma = GTK_ADJUSTMENT (data);
g_signal_connect (tool->gamma, "value-changed",
G_CALLBACK (levels_gamma_adjustment_update),
tool);
/* high input spin */
hbox2 = gtk_hbox_new (FALSE, 2);
gtk_box_pack_end (GTK_BOX (hbox), hbox2, FALSE, FALSE, 0);
gtk_widget_show (hbox2);
button = gimp_levels_tool_color_picker_new (tool, HIGH_INPUT);
gtk_box_pack_start (GTK_BOX (hbox2), button, FALSE, FALSE, 0);
gtk_widget_show (button);
spinbutton = gimp_spin_button_new (&data, 255, 0, 255, 1, 10, 10, 0.5, 0);
gtk_box_pack_start (GTK_BOX (hbox2), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
tool->high_input = GTK_ADJUSTMENT (data);
g_signal_connect (tool->high_input, "value-changed",
G_CALLBACK (levels_high_input_adjustment_update),
tool);
/* Output levels frame */
frame = gimp_frame_new (_("Output Levels"));
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
vbox2 = gtk_vbox_new (FALSE, 4);
gtk_container_add (GTK_CONTAINER (frame), vbox2);
gtk_widget_show (vbox2);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (vbox2), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
tool->output_area = gtk_event_box_new ();
gtk_widget_set_size_request (tool->output_area, -1,
GRADIENT_HEIGHT + CONTROL_HEIGHT);
gtk_widget_add_events (bar, LEVELS_EVENT_MASK);
gtk_container_add (GTK_CONTAINER (frame), tool->output_area);
gtk_widget_show (tool->output_area);
g_signal_connect (tool->output_area, "event",
G_CALLBACK (levels_output_area_event),
tool);
g_signal_connect_after (tool->output_area, "expose-event",
G_CALLBACK (levels_output_area_expose),
tool);
vbox3 = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (tool->output_area), vbox3);
gtk_widget_show (vbox3);
tool->output_bar = g_object_new (GIMP_TYPE_COLOR_BAR,
"xpad", border,
"ypad", 0,
NULL);
gtk_widget_set_size_request (tool->output_bar, -1, GRADIENT_HEIGHT);
gtk_box_pack_start (GTK_BOX (vbox3), tool->output_bar, FALSE, FALSE, 0);
gtk_widget_show (tool->output_bar);
/* Horizontal box for levels spin widgets */
hbox = gtk_hbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (vbox2), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
/* low output spin */
spinbutton = gimp_spin_button_new (&data, 0, 0, 255, 1, 10, 10, 0.5, 0);
gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
tool->low_output = GTK_ADJUSTMENT (data);
g_signal_connect (tool->low_output, "value-changed",
G_CALLBACK (levels_low_output_adjustment_update),
tool);
/* high output spin */
spinbutton = gimp_spin_button_new (&data, 255, 0, 255, 1, 10, 10, 0.5, 0);
gtk_box_pack_end (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
tool->high_output = GTK_ADJUSTMENT (data);
g_signal_connect (tool->high_output, "value-changed",
G_CALLBACK (levels_high_output_adjustment_update),
tool);
frame = gimp_frame_new (_("All Channels"));
gtk_box_pack_end (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
hbox = gtk_hbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (frame), hbox);
gtk_widget_show (hbox);
hbbox = gtk_hbutton_box_new ();
gtk_box_set_spacing (GTK_BOX (hbbox), 4);
gtk_box_pack_start (GTK_BOX (hbox), hbbox, FALSE, FALSE, 0);
gtk_widget_show (hbbox);
gtk_box_pack_start (GTK_BOX (hbbox), image_map_tool->load_button,
FALSE, FALSE, 0);
gtk_widget_show (image_map_tool->load_button);
gtk_box_pack_start (GTK_BOX (hbbox), image_map_tool->save_button,
FALSE, FALSE, 0);
gtk_widget_show (image_map_tool->save_button);
hbbox = gtk_hbox_new (FALSE, 6);
gtk_box_pack_end (GTK_BOX (hbox), hbbox, FALSE, FALSE, 0);
gtk_widget_show (hbbox);
button = gtk_button_new_with_mnemonic (_("_Auto"));
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
gimp_help_set_help_data (button, _("Adjust levels automatically"), NULL);
gtk_widget_show (button);
g_signal_connect (button, "clicked",
G_CALLBACK (levels_stretch_callback),
tool);
button = gimp_levels_tool_color_picker_new (tool,
LOW_INPUT | ALL_CHANNELS);
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
button = gimp_levels_tool_color_picker_new (tool, GAMMA | ALL_CHANNELS);
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
button = gimp_levels_tool_color_picker_new (tool,
HIGH_INPUT | ALL_CHANNELS);
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
}
static void
gimp_levels_tool_reset (GimpImageMapTool *image_map_tool)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (image_map_tool);
levels_init (tool->levels);
levels_update (tool, ALL);
}
static gboolean
gimp_levels_tool_settings_load (GimpImageMapTool *image_map_tool,
gpointer fp)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (image_map_tool);
FILE *file = fp;
gint low_input[5];
gint high_input[5];
gint low_output[5];
gint high_output[5];
gdouble gamma[5];
gint i, fields;
gchar buf[50];
gchar *nptr;
if (! fgets (buf, sizeof (buf), file))
return FALSE;
if (strcmp (buf, "# GIMP Levels File\n") != 0)
return FALSE;
for (i = 0; i < 5; i++)
{
fields = fscanf (file, "%d %d %d %d ",
&low_input[i],
&high_input[i],
&low_output[i],
&high_output[i]);
if (fields != 4)
return FALSE;
if (! fgets (buf, 50, file))
return FALSE;
gamma[i] = g_ascii_strtod (buf, &nptr);
if (buf == nptr || errno == ERANGE)
return FALSE;
}
for (i = 0; i < 5; i++)
{
tool->levels->low_input[i] = low_input[i];
tool->levels->high_input[i] = high_input[i];
tool->levels->low_output[i] = low_output[i];
tool->levels->high_output[i] = high_output[i];
tool->levels->gamma[i] = gamma[i];
}
levels_update (tool, ALL);
return TRUE;
}
static gboolean
gimp_levels_tool_settings_save (GimpImageMapTool *image_map_tool,
gpointer fp)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (image_map_tool);
FILE *file = fp;
gint i;
fprintf (file, "# GIMP Levels File\n");
for (i = 0; i < 5; i++)
{
gchar buf[G_ASCII_DTOSTR_BUF_SIZE];
fprintf (file, "%d %d %d %d %s\n",
tool->levels->low_input[i],
tool->levels->high_input[i],
tool->levels->low_output[i],
tool->levels->high_output[i],
g_ascii_formatd (buf, G_ASCII_DTOSTR_BUF_SIZE, "%f",
tool->levels->gamma[i]));
}
return TRUE;
}
static void
levels_draw_slider (GtkWidget *widget,
GdkGC *border_gc,
GdkGC *fill_gc,
gint xpos)
{
gint y;
for (y = 0; y < CONTROL_HEIGHT; y++)
gdk_draw_line (widget->window, fill_gc,
xpos - y / 2, GRADIENT_HEIGHT + y,
xpos + y / 2, GRADIENT_HEIGHT + y);
gdk_draw_line (widget->window, border_gc,
xpos,
GRADIENT_HEIGHT,
xpos - (CONTROL_HEIGHT - 1) / 2,
GRADIENT_HEIGHT + CONTROL_HEIGHT - 1);
gdk_draw_line (widget->window, border_gc,
xpos,
GRADIENT_HEIGHT,
xpos + (CONTROL_HEIGHT - 1) / 2,
GRADIENT_HEIGHT + CONTROL_HEIGHT - 1);
gdk_draw_line (widget->window, border_gc,
xpos - (CONTROL_HEIGHT - 1) / 2,
GRADIENT_HEIGHT + CONTROL_HEIGHT - 1,
xpos + (CONTROL_HEIGHT - 1) / 2,
GRADIENT_HEIGHT + CONTROL_HEIGHT - 1);
}
static void
levels_update (GimpLevelsTool *tool,
guint update)
{
GimpHistogramChannel channel;
if (tool->color)
{
channel = tool->channel;
}
else
{
/* FIXME: hack */
if (tool->channel == 1)
channel = GIMP_HISTOGRAM_ALPHA;
else
channel = GIMP_HISTOGRAM_VALUE;
}
/* Recalculate the transfer arrays */
levels_calculate_transfers (tool->levels);
/* set up the lut */
if (GIMP_IMAGE_MAP_TOOL (tool)->drawable)
gimp_lut_setup (tool->lut,
(GimpLutFunc) levels_lut_func,
tool->levels,
gimp_drawable_bytes (GIMP_IMAGE_MAP_TOOL (tool)->drawable));
if (update & LOW_INPUT)
gtk_adjustment_set_value (tool->low_input,
tool->levels->low_input[tool->channel]);
if (update & GAMMA)
gtk_adjustment_set_value (tool->gamma,
tool->levels->gamma[tool->channel]);
if (update & HIGH_INPUT)
gtk_adjustment_set_value (tool->high_input,
tool->levels->high_input[tool->channel]);
if (update & LOW_OUTPUT)
gtk_adjustment_set_value (tool->low_output,
tool->levels->low_output[tool->channel]);
if (update & HIGH_OUTPUT)
gtk_adjustment_set_value (tool->high_output,
tool->levels->high_output[tool->channel]);
if (update & INPUT_LEVELS)
{
switch (channel)
{
case GIMP_HISTOGRAM_VALUE:
case GIMP_HISTOGRAM_ALPHA:
case GIMP_HISTOGRAM_RGB:
gimp_color_bar_set_buffers (GIMP_COLOR_BAR (tool->input_bar),
tool->levels->input[tool->channel],
tool->levels->input[tool->channel],
tool->levels->input[tool->channel]);
break;
case GIMP_HISTOGRAM_RED:
case GIMP_HISTOGRAM_GREEN:
case GIMP_HISTOGRAM_BLUE:
gimp_color_bar_set_buffers (GIMP_COLOR_BAR (tool->input_bar),
tool->levels->input[GIMP_HISTOGRAM_RED],
tool->levels->input[GIMP_HISTOGRAM_GREEN],
tool->levels->input[GIMP_HISTOGRAM_BLUE]);
break;
}
}
if (update & OUTPUT_LEVELS)
{
gimp_color_bar_set_channel (GIMP_COLOR_BAR (tool->output_bar), channel);
}
if (update & INPUT_SLIDERS)
{
gtk_widget_queue_draw (tool->input_area);
}
if (update & OUTPUT_SLIDERS)
{
gtk_widget_queue_draw (tool->output_area);
}
}
static void
levels_channel_callback (GtkWidget *widget,
GimpLevelsTool *tool)
{
gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (widget),
(gint *) &tool->channel);
gimp_histogram_view_set_channel (GIMP_HISTOGRAM_VIEW (tool->hist_view),
tool->channel);
/* FIXME: hack */
if (! tool->color)
tool->channel = (tool->channel == GIMP_HISTOGRAM_ALPHA) ? 1 : 0;
levels_update (tool, ALL);
}
static void
levels_channel_reset_callback (GtkWidget *widget,
GimpLevelsTool *tool)
{
levels_channel_reset (tool->levels, tool->channel);
levels_update (tool, ALL);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
}
static gboolean
levels_menu_sensitivity (gint value,
gpointer data)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (data);
GimpHistogramChannel channel = value;
switch (channel)
{
case GIMP_HISTOGRAM_VALUE:
return TRUE;
case GIMP_HISTOGRAM_RED:
case GIMP_HISTOGRAM_GREEN:
case GIMP_HISTOGRAM_BLUE:
return tool->color;
case GIMP_HISTOGRAM_ALPHA:
return tool->alpha;
case GIMP_HISTOGRAM_RGB:
return FALSE;
}
return FALSE;
}
static void
levels_stretch_callback (GtkWidget *widget,
GimpLevelsTool *tool)
{
levels_stretch (tool->levels, tool->hist, tool->color);
levels_update (tool, ALL);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
}
static void
levels_low_input_adjustment_update (GtkAdjustment *adjustment,
GimpLevelsTool *tool)
{
gint value = ROUND (adjustment->value);
value = CLAMP (value, 0, tool->levels->high_input[tool->channel]);
/* enforce a consistent displayed value (low_input <= high_input) */
gtk_adjustment_set_value (adjustment, value);
if (tool->levels->low_input[tool->channel] != value)
{
tool->levels->low_input[tool->channel] = value;
levels_update (tool, INPUT_LEVELS | INPUT_SLIDERS);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
}
}
static void
levels_gamma_adjustment_update (GtkAdjustment *adjustment,
GimpLevelsTool *tool)
{
if (tool->levels->gamma[tool->channel] != adjustment->value)
{
tool->levels->gamma[tool->channel] = adjustment->value;
levels_update (tool, INPUT_LEVELS | INPUT_SLIDERS);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
}
}
static void
levels_high_input_adjustment_update (GtkAdjustment *adjustment,
GimpLevelsTool *tool)
{
gint value = ROUND (adjustment->value);
value = CLAMP (value, tool->levels->low_input[tool->channel], 255);
/* enforce a consistent displayed value (high_input >= low_input) */
gtk_adjustment_set_value (adjustment, value);
if (tool->levels->high_input[tool->channel] != value)
{
tool->levels->high_input[tool->channel] = value;
levels_update (tool, INPUT_LEVELS | INPUT_SLIDERS);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
}
}
static void
levels_low_output_adjustment_update (GtkAdjustment *adjustment,
GimpLevelsTool *tool)
{
gint value = ROUND (adjustment->value);
if (tool->levels->low_output[tool->channel] != value)
{
tool->levels->low_output[tool->channel] = value;
levels_update (tool, OUTPUT_LEVELS | OUTPUT_SLIDERS);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
}
}
static void
levels_high_output_adjustment_update (GtkAdjustment *adjustment,
GimpLevelsTool *tool)
{
gint value = ROUND (adjustment->value);
if (tool->levels->high_output[tool->channel] != value)
{
tool->levels->high_output[tool->channel] = value;
levels_update (tool, OUTPUT_LEVELS | OUTPUT_SLIDERS);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
}
}
static void
levels_input_picker_toggled (GtkWidget *widget,
GimpLevelsTool *tool)
{
if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (widget)))
{
if (tool->active_picker == widget)
return;
if (tool->active_picker)
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (tool->active_picker),
FALSE);
tool->active_picker = widget;
gimp_color_tool_enable (GIMP_COLOR_TOOL (tool),
GIMP_COLOR_OPTIONS (GIMP_TOOL (tool)->tool_info->tool_options));
}
else if (tool->active_picker == widget)
{
tool->active_picker = NULL;
gimp_color_tool_disable (GIMP_COLOR_TOOL (tool));
}
}
static gboolean
levels_input_area_event (GtkWidget *widget,
GdkEvent *event,
GimpLevelsTool *tool)
{
GdkEventButton *bevent;
GdkEventMotion *mevent;
gchar text[12];
gint x, distance;
gint i;
gboolean update = FALSE;
switch (event->type)
{
case GDK_BUTTON_PRESS:
bevent = (GdkEventButton *) event;
distance = G_MAXINT;
for (i = 0; i < 3; i++)
if (fabs (bevent->x - tool->slider_pos[i]) < distance)
{
tool->active_slider = i;
distance = fabs (bevent->x - tool->slider_pos[i]);
}
x = bevent->x;
update = TRUE;
break;
case GDK_BUTTON_RELEASE:
switch (tool->active_slider)
{
case 0: /* low input */
levels_update (tool, LOW_INPUT | GAMMA);
break;
case 1: /* gamma */
levels_update (tool, GAMMA);
break;
case 2: /* high input */
levels_update (tool, HIGH_INPUT | GAMMA);
break;
}
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
break;
case GDK_MOTION_NOTIFY:
mevent = (GdkEventMotion *) event;
gdk_window_get_pointer (widget->window, &x, NULL, NULL);
update = TRUE;
break;
default:
break;
}
if (update)
{
gdouble delta, mid, tmp;
gint width;
gint border;
g_object_get (tool->hist_view, "border-width", &border, NULL);
width = widget->allocation.width - 2 * border;
if (width < 1)
return FALSE;
switch (tool->active_slider)
{
case 0: /* low input */
tool->levels->low_input[tool->channel] =
((gdouble) (x - border) / (gdouble) width) * 255.0;
tool->levels->low_input[tool->channel] =
CLAMP (tool->levels->low_input[tool->channel],
0, tool->levels->high_input[tool->channel]);
break;
case 1: /* gamma */
delta = (gdouble) (tool->slider_pos[2] - tool->slider_pos[0]) / 2.0;
mid = tool->slider_pos[0] + delta;
x = CLAMP (x, tool->slider_pos[0], tool->slider_pos[2]);
tmp = (gdouble) (x - mid) / delta;
tool->levels->gamma[tool->channel] = 1.0 / pow (10, tmp);
/* round the gamma value to the nearest 1/100th */
sprintf (text, "%2.2f", tool->levels->gamma[tool->channel]);
tool->levels->gamma[tool->channel] = atof (text);
break;
case 2: /* high input */
tool->levels->high_input[tool->channel] =
((gdouble) (x - border) / (gdouble) width) * 255.0;
tool->levels->high_input[tool->channel] =
CLAMP (tool->levels->high_input[tool->channel],
tool->levels->low_input[tool->channel], 255);
break;
}
levels_update (tool, INPUT_SLIDERS | INPUT_LEVELS);
}
return FALSE;
}
static gboolean
levels_input_area_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpLevelsTool *tool)
{
Levels *levels = tool->levels;
gint width = widget->allocation.width;
gdouble delta, mid, tmp;
gint border;
g_object_get (tool->hist_view, "border-width", &border, NULL);
width -= 2 * border;
tool->slider_pos[0] = ROUND ((gdouble) width *
levels->low_input[tool->channel] /
256.0) + border;
tool->slider_pos[2] = ROUND ((gdouble) width *
levels->high_input[tool->channel] /
256.0) + border;
delta = (gdouble) (tool->slider_pos[2] - tool->slider_pos[0]) / 2.0;
mid = tool->slider_pos[0] + delta;
tmp = log10 (1.0 / levels->gamma[tool->channel]);
tool->slider_pos[1] = ROUND (mid + delta * tmp) + border;
levels_draw_slider (widget,
widget->style->black_gc,
widget->style->black_gc,
tool->slider_pos[0]);
levels_draw_slider (widget,
widget->style->black_gc,
widget->style->dark_gc[GTK_STATE_NORMAL],
tool->slider_pos[1]);
levels_draw_slider (widget,
widget->style->black_gc,
widget->style->white_gc,
tool->slider_pos[2]);
return FALSE;
}
static gboolean
levels_output_area_event (GtkWidget *widget,
GdkEvent *event,
GimpLevelsTool *tool)
{
GdkEventButton *bevent;
GdkEventMotion *mevent;
gint x, distance;
gint i;
gboolean update = FALSE;
switch (event->type)
{
case GDK_BUTTON_PRESS:
bevent = (GdkEventButton *) event;
distance = G_MAXINT;
for (i = 3; i < 5; i++)
if (fabs (bevent->x - tool->slider_pos[i]) < distance)
{
tool->active_slider = i;
distance = fabs (bevent->x - tool->slider_pos[i]);
}
x = bevent->x;
update = TRUE;
break;
case GDK_BUTTON_RELEASE:
switch (tool->active_slider)
{
case 3: /* low output */
levels_update (tool, LOW_OUTPUT);
break;
case 4: /* high output */
levels_update (tool, HIGH_OUTPUT);
break;
}
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
break;
case GDK_MOTION_NOTIFY:
mevent = (GdkEventMotion *) event;
gdk_window_get_pointer (widget->window, &x, NULL, NULL);
update = TRUE;
break;
default:
break;
}
if (update)
{
gint width;
gint border;
g_object_get (tool->hist_view, "border-width", &border, NULL);
width = widget->allocation.width - 2 * border;
if (width < 1)
return FALSE;
switch (tool->active_slider)
{
case 3: /* low output */
tool->levels->low_output[tool->channel] =
((gdouble) (x - border) / (gdouble) width) * 255.0;
tool->levels->low_output[tool->channel] =
CLAMP (tool->levels->low_output[tool->channel], 0, 255);
break;
case 4: /* high output */
tool->levels->high_output[tool->channel] =
((gdouble) (x - border) / (gdouble) width) * 255.0;
tool->levels->high_output[tool->channel] =
CLAMP (tool->levels->high_output[tool->channel], 0, 255);
break;
}
levels_update (tool, OUTPUT_SLIDERS);
}
return FALSE;
}
static gboolean
levels_output_area_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpLevelsTool *tool)
{
Levels *levels = tool->levels;
gint width = widget->allocation.width;
gint border;
g_object_get (tool->hist_view, "border-width", &border, NULL);
width -= 2 * border;
tool->slider_pos[3] = ROUND ((gdouble) width *
levels->low_output[tool->channel] /
256.0) + border;
tool->slider_pos[4] = ROUND ((gdouble) width *
levels->high_output[tool->channel] /
256.0) + border;
levels_draw_slider (widget,
widget->style->black_gc,
widget->style->black_gc,
tool->slider_pos[3]);
levels_draw_slider (widget,
widget->style->black_gc,
widget->style->white_gc,
tool->slider_pos[4]);
return FALSE;
}
static void
levels_input_adjust_by_color (Levels *levels,
guint value,
GimpHistogramChannel channel,
guchar *color)
{
switch (value & 0xF)
{
case LOW_INPUT:
levels_adjust_by_colors (levels, channel, color, NULL, NULL);
break;
case GAMMA:
levels_adjust_by_colors (levels, channel, NULL, color, NULL);
break;
case HIGH_INPUT:
levels_adjust_by_colors (levels, channel, NULL, NULL, color);
break;
default:
break;
}
}
static void
gimp_levels_tool_color_picked (GimpColorTool *color_tool,
GimpColorPickState pick_state,
GimpImageType sample_type,
GimpRGB *color,
gint color_index)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (color_tool);
guchar col[5];
guint value;
gimp_rgba_get_uchar (color,
col + RED_PIX,
col + GREEN_PIX,
col + BLUE_PIX,
col + ALPHA_PIX);
value = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (tool->active_picker),
"pick_value"));
if (value & ALL_CHANNELS && GIMP_IMAGE_TYPE_IS_RGB (sample_type))
{
GimpHistogramChannel channel;
/* first reset the value channel */
switch (value & 0xF)
{
case LOW_INPUT:
tool->levels->low_input[GIMP_HISTOGRAM_VALUE] = 0;
break;
case GAMMA:
tool->levels->gamma[GIMP_HISTOGRAM_VALUE] = 1.0;
break;
case HIGH_INPUT:
tool->levels->high_input[GIMP_HISTOGRAM_VALUE] = 255;
break;
default:
break;
}
/* then adjust all color channels */
for (channel = GIMP_HISTOGRAM_RED;
channel <= GIMP_HISTOGRAM_BLUE;
channel++)
{
levels_input_adjust_by_color (tool->levels,
value, channel, col);
}
}
else
{
levels_input_adjust_by_color (tool->levels,
value, tool->channel, col);
}
levels_update (tool, ALL);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
}
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