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gimp/app/tools/gimplevelstool.c

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/* GIMP - The GNU 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpconfig/gimpconfig.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "gegl/gimp-babl.h"
#include "operations/gimplevelsconfig.h"
#include "operations/gimpoperationlevels.h"
#include "core/gimp-gui.h"
#include "core/gimpasync.h"
#include "core/gimpcancelable.h"
#include "core/gimpdrawable.h"
#include "core/gimpdrawable-histogram.h"
#include "core/gimperror.h"
#include "core/gimphistogram.h"
#include "core/gimpimage.h"
#include "core/gimptoolinfo.h"
#include "core/gimptriviallycancelablewaitable.h"
#include "core/gimpwaitable.h"
#include "widgets/gimpcolorbar.h"
#include "widgets/gimphandlebar.h"
#include "widgets/gimphelp-ids.h"
#include "widgets/gimphistogramview.h"
#include "widgets/gimppropwidgets.h"
#include "widgets/gimpwidgets-constructors.h"
#include "display/gimpdisplay.h"
#include "gimphistogramoptions.h"
#include "gimplevelstool.h"
#include "gimp-intl.h"
#define PICK_LOW_INPUT (1 << 0)
#define PICK_GAMMA (1 << 1)
#define PICK_HIGH_INPUT (1 << 2)
#define PICK_ALL_CHANNELS (1 << 8)
#define HISTOGRAM_WIDTH 256
#define GRADIENT_HEIGHT 12
#define CONTROL_HEIGHT 10
/* local function prototypes */
static void gimp_levels_tool_finalize (GObject *object);
static gboolean gimp_levels_tool_initialize (GimpTool *tool,
GimpDisplay *display,
GError **error);
static gchar * gimp_levels_tool_get_operation (GimpFilterTool *filter_tool,
gchar **description);
static void gimp_levels_tool_dialog (GimpFilterTool *filter_tool);
static void gimp_levels_tool_reset (GimpFilterTool *filter_tool);
static void gimp_levels_tool_config_notify (GimpFilterTool *filter_tool,
GimpConfig *config,
const GParamSpec *pspec);
static gboolean gimp_levels_tool_settings_import(GimpFilterTool *filter_tool,
GInputStream *input,
GError **error);
static gboolean gimp_levels_tool_settings_export(GimpFilterTool *filter_tool,
GOutputStream *output,
GError **error);
static void gimp_levels_tool_color_picked (GimpFilterTool *filter_tool,
gpointer identifier,
gdouble x,
gdouble y,
const Babl *sample_format,
GeglColor *color);
static void gimp_levels_tool_export_setup (GimpSettingsBox *settings_box,
GtkFileChooserDialog *dialog,
gboolean export,
GimpLevelsTool *tool);
static void levels_update_input_bar (GimpLevelsTool *tool);
static void levels_channel_callback (GtkWidget *widget,
GimpFilterTool *filter_tool);
static void levels_channel_reset_callback (GtkWidget *widget,
GimpFilterTool *filter_tool);
static gboolean levels_menu_sensitivity (gint value,
gpointer data);
static void levels_stretch_callback (GtkWidget *widget,
GimpLevelsTool *tool);
static void levels_linear_gamma_changed (GtkAdjustment *adjustment,
GimpLevelsTool *tool);
static void levels_to_curves_callback (GtkWidget *widget,
GimpFilterTool *filter_tool);
G_DEFINE_TYPE (GimpLevelsTool, gimp_levels_tool, GIMP_TYPE_FILTER_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_ICON_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);
GimpFilterToolClass *filter_tool_class = GIMP_FILTER_TOOL_CLASS (klass);
object_class->finalize = gimp_levels_tool_finalize;
tool_class->initialize = gimp_levels_tool_initialize;
filter_tool_class->get_operation = gimp_levels_tool_get_operation;
filter_tool_class->dialog = gimp_levels_tool_dialog;
filter_tool_class->reset = gimp_levels_tool_reset;
filter_tool_class->config_notify = gimp_levels_tool_config_notify;
filter_tool_class->settings_import = gimp_levels_tool_settings_import;
filter_tool_class->settings_export = gimp_levels_tool_settings_export;
filter_tool_class->color_picked = gimp_levels_tool_color_picked;
}
static void
gimp_levels_tool_init (GimpLevelsTool *tool)
{
}
static void
gimp_levels_tool_finalize (GObject *object)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (object);
g_clear_object (&tool->histogram);
g_clear_object (&tool->histogram_async);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gimp_levels_tool_initialize (GimpTool *tool,
GimpDisplay *display,
GError **error)
{
GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (tool);
GimpLevelsTool *l_tool = GIMP_LEVELS_TOOL (tool);
GimpImage *image = gimp_display_get_image (display);
GList *drawables;
GimpDrawable *drawable;
GimpLevelsConfig *config;
gdouble scale_factor;
gdouble step_increment;
gdouble page_increment;
gint digits;
if (! GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error))
{
return FALSE;
}
drawables = gimp_image_get_selected_drawables (image);
if (g_list_length (drawables) != 1)
{
if (g_list_length (drawables) > 1)
gimp_tool_message_literal (tool, display,
_("Cannot modify multiple drawables. Select only one."));
else
gimp_tool_message_literal (tool, display, _("No selected drawables."));
g_list_free (drawables);
return FALSE;
}
drawable = drawables->data;
g_list_free (drawables);
config = GIMP_LEVELS_CONFIG (filter_tool->config);
g_clear_object (&l_tool->histogram);
g_clear_object (&l_tool->histogram_async);
l_tool->histogram = gimp_histogram_new (config->trc);
l_tool->histogram_async = gimp_drawable_calculate_histogram_async
(drawable, l_tool->histogram, FALSE);
gimp_histogram_view_set_histogram (GIMP_HISTOGRAM_VIEW (l_tool->histogram_view),
l_tool->histogram);
if (gimp_drawable_get_component_type (drawable) == GIMP_COMPONENT_TYPE_U8)
{
scale_factor = 255.0;
step_increment = 1.0;
page_increment = 8.0;
digits = 0;
}
else
{
scale_factor = 100;
step_increment = 0.01;
page_increment = 1.0;
digits = 2;
}
gimp_prop_widget_set_factor (l_tool->low_input_spinbutton,
scale_factor, step_increment, page_increment,
digits);
gimp_prop_widget_set_factor (l_tool->high_input_spinbutton,
scale_factor, step_increment, page_increment,
digits);
gimp_prop_widget_set_factor (l_tool->low_output_spinbutton,
scale_factor, step_increment, page_increment,
digits);
gimp_prop_widget_set_factor (l_tool->high_output_spinbutton,
scale_factor, step_increment, page_increment,
digits);
gtk_adjustment_configure (l_tool->gamma_linear,
scale_factor / 2.0,
0, scale_factor, 0.1, 1.0, 0);
return TRUE;
}
static gchar *
gimp_levels_tool_get_operation (GimpFilterTool *filter_tool,
gchar **description)
{
*description = g_strdup (_("Adjust Color Levels"));
return g_strdup ("gimp:levels");
}
/*******************/
/* Levels dialog */
/*******************/
static GtkWidget *
gimp_levels_tool_color_picker_new (GimpLevelsTool *tool,
guint value)
{
const gchar *icon_name;
const gchar *help;
gboolean all_channels = (value & PICK_ALL_CHANNELS) != 0;
switch (value & 0xF)
{
case PICK_LOW_INPUT:
icon_name = GIMP_ICON_COLOR_PICKER_BLACK;
if (all_channels)
help = _("Pick black point for all channels");
else
help = _("Pick black point for the selected channel");
break;
case PICK_GAMMA:
icon_name = GIMP_ICON_COLOR_PICKER_GRAY;
if (all_channels)
help = _("Pick gray point for all channels");
else
help = _("Pick gray point for the selected channel");
break;
case PICK_HIGH_INPUT:
icon_name = GIMP_ICON_COLOR_PICKER_WHITE;
if (all_channels)
help = _("Pick white point for all channels");
else
help = _("Pick white point for the selected channel");
break;
default:
return NULL;
}
return gimp_filter_tool_add_color_picker (GIMP_FILTER_TOOL (tool),
GUINT_TO_POINTER (value),
icon_name,
help,
/* pick_abyss = */ FALSE,
NULL, NULL);
}
static void
gimp_levels_tool_dialog (GimpFilterTool *filter_tool)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (filter_tool);
GimpToolOptions *tool_options = GIMP_TOOL_GET_OPTIONS (filter_tool);
GimpLevelsConfig *config = GIMP_LEVELS_CONFIG (filter_tool->config);
GtkListStore *store;
GtkWidget *main_vbox;
GtkWidget *frame_vbox;
GtkWidget *vbox;
GtkWidget *vbox2;
GtkWidget *vbox3;
GtkWidget *hbox;
GtkWidget *hbox2;
GtkWidget *label;
GtkWidget *main_frame;
GtkWidget *frame;
GtkWidget *button;
GtkWidget *spinbutton;
GtkAdjustment *adjustment;
GtkWidget *bar;
GtkWidget *handle_bar;
gint border;
g_signal_connect (filter_tool->settings_box, "file-dialog-setup",
G_CALLBACK (gimp_levels_tool_export_setup),
filter_tool);
main_vbox = gimp_filter_tool_dialog_get_vbox (filter_tool);
/* The combo box for selecting channels */
main_frame = gimp_frame_new (NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), main_frame, TRUE, TRUE, 0);
gtk_widget_show (main_frame);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_frame_set_label_widget (GTK_FRAME (main_frame), hbox);
gtk_widget_show (hbox);
label = gtk_label_new_with_mnemonic (_("Cha_nnel:"));
gimp_label_set_attributes (GTK_LABEL (label),
PANGO_ATTR_WEIGHT, PANGO_WEIGHT_BOLD,
-1);
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);
g_set_weak_pointer (&tool->channel_menu,
gimp_enum_combo_box_new_with_model (GIMP_ENUM_STORE (store)));
g_object_unref (store);
gimp_enum_combo_box_set_icon_prefix (GIMP_ENUM_COMBO_BOX (tool->channel_menu),
"gimp-channel");
gimp_int_combo_box_set_sensitivity (GIMP_INT_COMBO_BOX (tool->channel_menu),
levels_menu_sensitivity, filter_tool, NULL);
gtk_box_pack_start (GTK_BOX (hbox), tool->channel_menu, FALSE, FALSE, 0);
gtk_widget_show (tool->channel_menu);
g_signal_connect (tool->channel_menu, "changed",
G_CALLBACK (levels_channel_callback),
tool);
gtk_label_set_mnemonic_widget (GTK_LABEL (label), tool->channel_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);
/* The histogram scale radio buttons */
hbox2 = gimp_prop_enum_icon_box_new (G_OBJECT (tool_options),
"histogram-scale", "gimp-histogram",
0, 0);
gtk_box_pack_end (GTK_BOX (hbox), hbox2, FALSE, FALSE, 0);
/* The linear/perceptual radio buttons */
hbox2 = gimp_prop_enum_icon_box_new (G_OBJECT (config), "trc",
"gimp-color-space",
-1, -1);
gtk_box_pack_end (GTK_BOX (hbox), hbox2, FALSE, FALSE, 0);
frame_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
gtk_container_add (GTK_CONTAINER (main_frame), frame_vbox);
gtk_widget_show (frame_vbox);
/* Input levels frame */
frame = gimp_frame_new (_("Input Levels"));
gtk_box_pack_start (GTK_BOX (frame_vbox), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
gtk_container_add (GTK_CONTAINER (frame), vbox);
gtk_widget_show (vbox);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
vbox2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_container_add (GTK_CONTAINER (frame), vbox2);
gtk_widget_show (vbox2);
g_set_weak_pointer (&tool->histogram_view,
gimp_histogram_view_new (FALSE));
gtk_box_pack_start (GTK_BOX (vbox2), tool->histogram_view, TRUE, TRUE, 0);
gtk_widget_show (GTK_WIDGET (tool->histogram_view));
g_object_bind_property (G_OBJECT (tool_options), "histogram-scale",
G_OBJECT (tool->histogram_view), "histogram-scale",
G_BINDING_SYNC_CREATE |
G_BINDING_BIDIRECTIONAL);
g_object_get (tool->histogram_view, "border-width", &border, NULL);
vbox3 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_container_set_border_width (GTK_CONTAINER (vbox3), border);
gtk_box_pack_start (GTK_BOX (vbox2), vbox3, FALSE, FALSE, 0);
gtk_widget_show (vbox3);
tool->input_bar = g_object_new (GIMP_TYPE_COLOR_BAR, 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, 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);
handle_bar = g_object_new (GIMP_TYPE_HANDLE_BAR, NULL);
gtk_widget_set_size_request (handle_bar, -1, CONTROL_HEIGHT);
gtk_box_pack_start (GTK_BOX (vbox3), handle_bar, FALSE, FALSE, 0);
gtk_widget_show (handle_bar);
gimp_handle_bar_connect_events (GIMP_HANDLE_BAR (handle_bar),
tool->input_bar);
gimp_handle_bar_connect_events (GIMP_HANDLE_BAR (handle_bar),
bar);
/* Horizontal box for input levels spinbuttons */
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
/* low input spin */
hbox2 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 2);
gtk_box_pack_start (GTK_BOX (hbox), hbox2, FALSE, FALSE, 0);
gtk_widget_show (hbox2);
button = gimp_levels_tool_color_picker_new (tool, PICK_LOW_INPUT);
gtk_box_pack_start (GTK_BOX (hbox2), button, FALSE, FALSE, 0);
gtk_widget_show (button);
tool->low_input_spinbutton = spinbutton =
gimp_prop_spin_button_new (filter_tool->config, "low-input",
0.01, 0.1, 1);
gtk_box_pack_start (GTK_BOX (hbox2), spinbutton, FALSE, FALSE, 0);
tool->low_input = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (spinbutton));
gimp_handle_bar_set_adjustment (GIMP_HANDLE_BAR (handle_bar), 0,
tool->low_input);
/* clamp input toggle */
hbox2 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 2);
gtk_box_pack_start (GTK_BOX (hbox), hbox2, TRUE, FALSE, 0);
gtk_widget_show (hbox2);
button = gimp_prop_check_button_new (filter_tool->config, "clamp-input",
_("Clamp _input"));
gtk_box_pack_start (GTK_BOX (hbox2), button, FALSE, FALSE, 0);
/* input gamma spin */
spinbutton = gimp_prop_spin_button_new (filter_tool->config, "gamma",
0.01, 0.1, 2);
gtk_box_pack_start (GTK_BOX (hbox2), spinbutton, FALSE, FALSE, 0);
gimp_help_set_help_data (spinbutton, _("Gamma"), NULL);
tool->gamma = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (spinbutton));
tool->gamma_linear = gtk_adjustment_new (127, 0, 255, 0.1, 1.0, 0.0);
g_signal_connect (tool->gamma_linear, "value-changed",
G_CALLBACK (levels_linear_gamma_changed),
tool);
gimp_handle_bar_set_adjustment (GIMP_HANDLE_BAR (handle_bar), 1,
tool->gamma_linear);
g_object_unref (tool->gamma_linear);
/* high input spin */
hbox2 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 2);
gtk_box_pack_end (GTK_BOX (hbox), hbox2, FALSE, FALSE, 0);
gtk_widget_show (hbox2);
button = gimp_levels_tool_color_picker_new (tool, PICK_HIGH_INPUT);
gtk_box_pack_start (GTK_BOX (hbox2), button, FALSE, FALSE, 0);
gtk_widget_show (button);
spinbutton = gimp_prop_spin_button_new (filter_tool->config, "high-input",
0.01, 0.1, 1);
gtk_box_pack_start (GTK_BOX (hbox2), spinbutton, FALSE, FALSE, 0);
tool->high_input_spinbutton = spinbutton;
tool->high_input = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (spinbutton));
gimp_handle_bar_set_adjustment (GIMP_HANDLE_BAR (handle_bar), 2,
tool->high_input);
/* Output levels frame */
frame = gimp_frame_new (_("Output Levels"));
gtk_box_pack_start (GTK_BOX (frame_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
gtk_container_add (GTK_CONTAINER (frame), vbox);
gtk_widget_show (vbox);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
vbox2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_container_set_border_width (GTK_CONTAINER (vbox2), border);
gtk_container_add (GTK_CONTAINER (frame), vbox2);
gtk_widget_show (vbox2);
tool->output_bar = g_object_new (GIMP_TYPE_COLOR_BAR, NULL);
gtk_widget_set_size_request (tool->output_bar, -1, GRADIENT_HEIGHT);
gtk_box_pack_start (GTK_BOX (vbox2), tool->output_bar, FALSE, FALSE, 0);
gtk_widget_show (tool->output_bar);
handle_bar = g_object_new (GIMP_TYPE_HANDLE_BAR, NULL);
gtk_widget_set_size_request (handle_bar, -1, CONTROL_HEIGHT);
gtk_box_pack_start (GTK_BOX (vbox2), handle_bar, FALSE, FALSE, 0);
gtk_widget_show (handle_bar);
gimp_handle_bar_connect_events (GIMP_HANDLE_BAR (handle_bar),
tool->output_bar);
/* Horizontal box for levels spin widgets */
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
/* low output spin */
tool->low_output_spinbutton = spinbutton =
gimp_prop_spin_button_new (filter_tool->config, "low-output",
0.01, 0.1, 1);
gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
adjustment = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (spinbutton));
gimp_handle_bar_set_adjustment (GIMP_HANDLE_BAR (handle_bar), 0, adjustment);
/* clamp output toggle */
button = gimp_prop_check_button_new (filter_tool->config, "clamp-output",
_("Clamp outpu_t"));
gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, FALSE, 0);
/* high output spin */
tool->high_output_spinbutton = spinbutton =
gimp_prop_spin_button_new (filter_tool->config, "high-output",
0.01, 0.1, 1);
gtk_box_pack_end (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
adjustment = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (spinbutton));
gimp_handle_bar_set_adjustment (GIMP_HANDLE_BAR (handle_bar), 2, adjustment);
/* all channels frame */
main_frame = gimp_frame_new (_("All Channels"));
gtk_box_pack_start (GTK_BOX (main_vbox), main_frame, FALSE, FALSE, 0);
gtk_widget_show (main_frame);
frame_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
gtk_container_add (GTK_CONTAINER (main_frame), frame_vbox);
gtk_widget_show (frame_vbox);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_box_pack_start (GTK_BOX (frame_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
button = gtk_button_new_with_mnemonic (_("_Auto Input Levels"));
gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gimp_help_set_help_data (button,
_("Adjust levels for all channels 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,
PICK_HIGH_INPUT |
PICK_ALL_CHANNELS);
gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
button = gimp_levels_tool_color_picker_new (tool,
PICK_GAMMA |
PICK_ALL_CHANNELS);
gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
button = gimp_levels_tool_color_picker_new (tool,
PICK_LOW_INPUT |
PICK_ALL_CHANNELS);
gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
button = gimp_icon_button_new (GIMP_ICON_TOOL_CURVES,
_("Edit these Settings as Curves"));
gtk_box_pack_start (GTK_BOX (main_vbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
g_signal_connect (button, "clicked",
G_CALLBACK (levels_to_curves_callback),
tool);
gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (tool->channel_menu),
config->channel);
}
static void
gimp_levels_tool_reset (GimpFilterTool *filter_tool)
{
GimpHistogramChannel channel;
g_object_get (filter_tool->config,
"channel", &channel,
NULL);
GIMP_FILTER_TOOL_CLASS (parent_class)->reset (filter_tool);
g_object_set (filter_tool->config,
"channel", channel,
NULL);
}
static void
gimp_levels_tool_config_notify (GimpFilterTool *filter_tool,
GimpConfig *config,
const GParamSpec *pspec)
{
GimpLevelsTool *levels_tool = GIMP_LEVELS_TOOL (filter_tool);
GimpLevelsConfig *levels_config = GIMP_LEVELS_CONFIG (config);
GIMP_FILTER_TOOL_CLASS (parent_class)->config_notify (filter_tool,
config, pspec);
if (! levels_tool->channel_menu ||
! levels_tool->histogram_view)
return;
if (! strcmp (pspec->name, "trc"))
{
g_clear_object (&levels_tool->histogram);
g_clear_object (&levels_tool->histogram_async);
levels_tool->histogram = gimp_histogram_new (levels_config->trc);
levels_tool->histogram_async = gimp_drawable_calculate_histogram_async
(GIMP_TOOL (filter_tool)->drawables->data, levels_tool->histogram, FALSE);
gimp_histogram_view_set_histogram (GIMP_HISTOGRAM_VIEW (levels_tool->histogram_view),
levels_tool->histogram);
}
else if (! strcmp (pspec->name, "channel"))
{
gimp_histogram_view_set_channel (GIMP_HISTOGRAM_VIEW (levels_tool->histogram_view),
levels_config->channel);
gimp_color_bar_set_channel (GIMP_COLOR_BAR (levels_tool->output_bar),
levels_config->channel);
gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (levels_tool->channel_menu),
levels_config->channel);
}
else if (! strcmp (pspec->name, "gamma") ||
! strcmp (pspec->name, "low-input") ||
! strcmp (pspec->name, "high-input"))
{
gdouble low = gtk_adjustment_get_value (levels_tool->low_input);
gdouble high = gtk_adjustment_get_value (levels_tool->high_input);
gdouble delta, mid, tmp, value;
gtk_adjustment_set_lower (levels_tool->high_input, low);
gtk_adjustment_set_lower (levels_tool->gamma_linear, low);
gtk_adjustment_set_upper (levels_tool->low_input, high);
gtk_adjustment_set_upper (levels_tool->gamma_linear, high);
levels_update_input_bar (levels_tool);
delta = (high - low) / 2.0;
mid = low + delta;
tmp = log10 (1.0 / levels_config->gamma[levels_config->channel]);
value = mid + delta * tmp;
gtk_adjustment_set_value (levels_tool->gamma_linear, value);
}
}
static gboolean
gimp_levels_tool_settings_import (GimpFilterTool *filter_tool,
GInputStream *input,
GError **error)
{
GimpLevelsConfig *config = GIMP_LEVELS_CONFIG (filter_tool->config);
gchar header[64];
gsize bytes_read;
if (! g_input_stream_read_all (input, header, sizeof (header),
&bytes_read, NULL, error) ||
bytes_read != sizeof (header))
{
g_prefix_error (error, _("Could not read header: "));
return FALSE;
}
g_seekable_seek (G_SEEKABLE (input), 0, G_SEEK_SET, NULL, NULL);
if (g_str_has_prefix (header, "# GIMP Levels File\n"))
return gimp_levels_config_load_cruft (config, input, error);
return GIMP_FILTER_TOOL_CLASS (parent_class)->settings_import (filter_tool,
input,
error);
}
static gboolean
gimp_levels_tool_settings_export (GimpFilterTool *filter_tool,
GOutputStream *output,
GError **error)
{
GimpLevelsTool *tool = GIMP_LEVELS_TOOL (filter_tool);
GimpLevelsConfig *config = GIMP_LEVELS_CONFIG (filter_tool->config);
if (tool->export_old_format)
return gimp_levels_config_save_cruft (config, output, error);
return GIMP_FILTER_TOOL_CLASS (parent_class)->settings_export (filter_tool,
output,
error);
}
static void
levels_input_adjust_by_color (GimpLevelsConfig *config,
guint value,
GimpHistogramChannel channel,
GeglColor *color)
{
switch (value & 0xF)
{
case PICK_LOW_INPUT:
gimp_levels_config_adjust_by_colors (config, channel, color, NULL, NULL);
break;
case PICK_GAMMA:
gimp_levels_config_adjust_by_colors (config, channel, NULL, color, NULL);
break;
case PICK_HIGH_INPUT:
gimp_levels_config_adjust_by_colors (config, channel, NULL, NULL, color);
break;
default:
break;
}
}
static void
gimp_levels_tool_color_picked (GimpFilterTool *color_tool,
gpointer identifier,
gdouble x,
gdouble y,
const Babl *sample_format,
GeglColor *color)
{
GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (color_tool);
GimpLevelsConfig *config = GIMP_LEVELS_CONFIG (filter_tool->config);
guint value = GPOINTER_TO_UINT (identifier);
if (value & PICK_ALL_CHANNELS &&
gimp_babl_format_get_base_type (sample_format) == GIMP_RGB)
{
GimpHistogramChannel channel;
/* first reset the value channel */
switch (value & 0xF)
{
case PICK_LOW_INPUT:
config->low_input[GIMP_HISTOGRAM_VALUE] = 0.0;
break;
case PICK_GAMMA:
config->gamma[GIMP_HISTOGRAM_VALUE] = 1.0;
break;
case PICK_HIGH_INPUT:
config->high_input[GIMP_HISTOGRAM_VALUE] = 1.0;
break;
default:
break;
}
/* then adjust all color channels */
for (channel = GIMP_HISTOGRAM_RED;
channel <= GIMP_HISTOGRAM_BLUE;
channel++)
{
levels_input_adjust_by_color (config, value, channel, color);
}
}
else
{
levels_input_adjust_by_color (config, value, config->channel, color);
}
}
static void
gimp_levels_tool_export_setup (GimpSettingsBox *settings_box,
GtkFileChooserDialog *dialog,
gboolean export,
GimpLevelsTool *tool)
{
GtkWidget *button;
if (! export)
return;
button = gtk_check_button_new_with_mnemonic (_("Use _old levels file format"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button),
tool->export_old_format);
gtk_file_chooser_set_extra_widget (GTK_FILE_CHOOSER (dialog), button);
gtk_widget_show (button);
g_signal_connect (button, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&tool->export_old_format);
}
static void
levels_update_input_bar (GimpLevelsTool *tool)
{
GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (tool);
GimpLevelsConfig *config = GIMP_LEVELS_CONFIG (filter_tool->config);
switch (config->channel)
{
gdouble value;
case GIMP_HISTOGRAM_VALUE:
case GIMP_HISTOGRAM_ALPHA:
case GIMP_HISTOGRAM_RGB:
case GIMP_HISTOGRAM_LUMINANCE:
{
guchar v[256];
gint i;
for (i = 0; i < 256; i++)
{
value = gimp_operation_levels_map_input (config,
config->channel,
i / 255.0);
v[i] = CLAMP (value, 0.0, 1.0) * 255.999;
}
gimp_color_bar_set_buffers (GIMP_COLOR_BAR (tool->input_bar),
v, v, v);
}
break;
case GIMP_HISTOGRAM_RED:
case GIMP_HISTOGRAM_GREEN:
case GIMP_HISTOGRAM_BLUE:
{
guchar r[256];
guchar g[256];
guchar b[256];
gint i;
for (i = 0; i < 256; i++)
{
value = gimp_operation_levels_map_input (config,
GIMP_HISTOGRAM_RED,
i / 255.0);
r[i] = CLAMP (value, 0.0, 1.0) * 255.999;
value = gimp_operation_levels_map_input (config,
GIMP_HISTOGRAM_GREEN,
i / 255.0);
g[i] = CLAMP (value, 0.0, 1.0) * 255.999;
value = gimp_operation_levels_map_input (config,
GIMP_HISTOGRAM_BLUE,
i / 255.0);
b[i] = CLAMP (value, 0.0, 1.0) * 255.999;
}
gimp_color_bar_set_buffers (GIMP_COLOR_BAR (tool->input_bar),
r, g, b);
}
break;
}
}
static void
levels_channel_callback (GtkWidget *widget,
GimpFilterTool *filter_tool)
{
GimpLevelsConfig *config = GIMP_LEVELS_CONFIG (filter_tool->config);
gint value;
if (gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (widget), &value) &&
config->channel != value)
{
g_object_set (config,
"channel", value,
NULL);
}
}
static void
levels_channel_reset_callback (GtkWidget *widget,
GimpFilterTool *filter_tool)
{
gimp_levels_config_reset_channel (GIMP_LEVELS_CONFIG (filter_tool->config));
}
static gboolean
levels_menu_sensitivity (gint value,
gpointer data)
{
GimpDrawable *drawable;
GimpHistogramChannel channel = value;
if (! GIMP_TOOL (data)->drawables)
return FALSE;
drawable = GIMP_TOOL (data)->drawables->data;
switch (channel)
{
case GIMP_HISTOGRAM_VALUE:
return TRUE;
case GIMP_HISTOGRAM_RED:
case GIMP_HISTOGRAM_GREEN:
case GIMP_HISTOGRAM_BLUE:
return gimp_drawable_is_rgb (drawable);
case GIMP_HISTOGRAM_ALPHA:
return gimp_drawable_has_alpha (drawable);
case GIMP_HISTOGRAM_RGB:
return FALSE;
case GIMP_HISTOGRAM_LUMINANCE:
return FALSE;
}
return FALSE;
}
static void
levels_stretch_callback (GtkWidget *widget,
GimpLevelsTool *levels_tool)
{
GimpTool *tool = GIMP_TOOL (levels_tool);
GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (levels_tool);
GimpWaitable *waitable;
waitable = gimp_trivially_cancelable_waitable_new (
GIMP_WAITABLE (levels_tool->histogram_async));
gimp_wait (tool->tool_info->gimp, waitable, _("Calculating histogram..."));
g_object_unref (waitable);
if (gimp_async_is_synced (levels_tool->histogram_async) &&
gimp_async_is_finished (levels_tool->histogram_async))
{
gimp_levels_config_stretch (GIMP_LEVELS_CONFIG (filter_tool->config),
levels_tool->histogram,
gimp_drawable_is_rgb (tool->drawables->data));
}
}
static void
levels_linear_gamma_changed (GtkAdjustment *adjustment,
GimpLevelsTool *tool)
{
gdouble low_input = gtk_adjustment_get_value (tool->low_input);
gdouble high_input = gtk_adjustment_get_value (tool->high_input);
gdouble delta, mid, tmp, value;
delta = (high_input - low_input) / 2.0;
if (delta >= 0.5)
{
mid = low_input + delta;
tmp = (gtk_adjustment_get_value (adjustment) - mid) / delta;
value = 1.0 / pow (10, tmp);
/* round the gamma value to the nearest 1/100th */
value = floor (value * 100 + 0.5) / 100.0;
gtk_adjustment_set_value (tool->gamma, value);
}
}
static void
levels_to_curves_callback (GtkWidget *widget,
GimpFilterTool *filter_tool)
{
GimpLevelsConfig *config = GIMP_LEVELS_CONFIG (filter_tool->config);
GimpCurvesConfig *curves;
curves = gimp_levels_config_to_curves_config (config);
gimp_filter_tool_edit_as (filter_tool,
"gimp-curves-tool",
GIMP_CONFIG (curves));
g_object_unref (curves);
}
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