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gimp/app/widgets/gimphistogrameditor.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 "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "core/gimp.h"
#include "core/gimpasync.h"
#include "core/gimpdrawable.h"
#include "core/gimpdrawable-histogram.h"
#include "core/gimphistogram.h"
#include "core/gimpimage.h"
#include "gimpdocked.h"
#include "gimphelp-ids.h"
#include "gimphistogrambox.h"
#include "gimphistogrameditor.h"
#include "gimphistogramview.h"
#include "gimppropwidgets.h"
#include "gimpsessioninfo-aux.h"
#include "gimpwidgets-utils.h"
#include "gimp-intl.h"
enum
{
PROP_0,
PROP_TRC
};
static void gimp_histogram_editor_docked_iface_init (GimpDockedInterface *iface);
static void gimp_histogram_editor_finalize (GObject *object);
static void gimp_histogram_editor_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_histogram_editor_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_histogram_editor_set_aux_info (GimpDocked *docked,
GList *aux_info);
static GList * gimp_histogram_editor_get_aux_info (GimpDocked *docked);
static void gimp_histogram_editor_set_image (GimpImageEditor *editor,
GimpImage *image);
static void gimp_histogram_editor_layer_changed (GimpImage *image,
GimpHistogramEditor *editor);
static void gimp_histogram_editor_frozen_update (GimpHistogramEditor *editor,
const GParamSpec *pspec);
static void gimp_histogram_editor_buffer_update (GimpHistogramEditor *editor,
const GParamSpec *pspec);
static void gimp_histogram_editor_update (GimpHistogramEditor *editor);
static gboolean gimp_histogram_editor_idle_update (GimpHistogramEditor *editor);
static gboolean gimp_histogram_menu_sensitivity (gint value,
gpointer data);
static void gimp_histogram_editor_menu_update (GimpHistogramEditor *editor);
static void gimp_histogram_editor_name_update (GimpHistogramEditor *editor);
static void gimp_histogram_editor_info_update (GimpHistogramEditor *editor);
static gboolean gimp_histogram_editor_view_draw (GimpHistogramEditor *editor,
cairo_t *cr);
G_DEFINE_TYPE_WITH_CODE (GimpHistogramEditor, gimp_histogram_editor,
GIMP_TYPE_IMAGE_EDITOR,
G_IMPLEMENT_INTERFACE (GIMP_TYPE_DOCKED,
gimp_histogram_editor_docked_iface_init))
#define parent_class gimp_histogram_editor_parent_class
static GimpDockedInterface *parent_docked_iface = NULL;
static void
gimp_histogram_editor_class_init (GimpHistogramEditorClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpImageEditorClass *image_editor_class = GIMP_IMAGE_EDITOR_CLASS (klass);
object_class->finalize = gimp_histogram_editor_finalize;
object_class->set_property = gimp_histogram_editor_set_property;
object_class->get_property = gimp_histogram_editor_get_property;
image_editor_class->set_image = gimp_histogram_editor_set_image;
g_object_class_install_property (object_class, PROP_TRC,
g_param_spec_enum ("trc",
_("Linear/Perceptual"),
NULL,
GIMP_TYPE_TRC_TYPE,
GIMP_TRC_LINEAR,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
}
static void
gimp_histogram_editor_init (GimpHistogramEditor *editor)
{
GimpHistogramView *view;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *menu;
GtkWidget *grid;
gint i;
const gchar *gimp_histogram_editor_labels[] =
{
N_("Mean:"),
N_("Std dev:"),
N_("Median:"),
N_("Pixels:"),
N_("Count:"),
N_("Percentile:")
};
editor->box = gimp_histogram_box_new ();
gimp_editor_set_show_name (GIMP_EDITOR (editor), TRUE);
view = GIMP_HISTOGRAM_BOX (editor->box)->view;
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
gtk_box_pack_start (GTK_BOX (editor), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
editor->menu = menu = gimp_prop_enum_combo_box_new (G_OBJECT (view),
"histogram-channel",
0, 0);
gimp_enum_combo_box_set_icon_prefix (GIMP_ENUM_COMBO_BOX (menu),
"gimp-channel");
gimp_int_combo_box_set_sensitivity (GIMP_INT_COMBO_BOX (editor->menu),
gimp_histogram_menu_sensitivity,
editor, NULL);
gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (editor->menu),
view->channel);
gtk_box_pack_start (GTK_BOX (hbox), menu, FALSE, FALSE, 0);
gimp_help_set_help_data (editor->menu,
_("Histogram channel"), NULL);
menu = gimp_prop_enum_icon_box_new (G_OBJECT (view),
"histogram-scale", "gimp-histogram",
0, 0);
gtk_box_pack_end (GTK_BOX (hbox), menu, FALSE, FALSE, 0);
menu = gimp_prop_enum_icon_box_new (G_OBJECT (editor), "trc",
"gimp-color-space",
-1, -1);
gtk_box_pack_end (GTK_BOX (hbox), menu, FALSE, FALSE, 0);
gtk_box_pack_start (GTK_BOX (editor), editor->box, TRUE, TRUE, 0);
gtk_widget_show (GTK_WIDGET (editor->box));
g_signal_connect_swapped (view, "range-changed",
G_CALLBACK (gimp_histogram_editor_info_update),
editor);
g_signal_connect_swapped (view, "notify::histogram-channel",
G_CALLBACK (gimp_histogram_editor_info_update),
editor);
g_signal_connect_swapped (view, "draw",
G_CALLBACK (gimp_histogram_editor_view_draw),
editor);
grid = gtk_grid_new ();
gtk_grid_set_column_spacing (GTK_GRID (grid), 2);
gtk_box_pack_start (GTK_BOX (editor), grid, FALSE, FALSE, 0);
gtk_widget_show (grid);
for (i = 0; i < 6; i++)
{
gint x = (i / 3) * 2;
gint y = (i % 3);
label = gtk_label_new (gettext (gimp_histogram_editor_labels[i]));
gimp_label_set_attributes (GTK_LABEL (label),
PANGO_ATTR_WEIGHT, PANGO_WEIGHT_BOLD,
PANGO_ATTR_SCALE, PANGO_SCALE_SMALL,
-1);
gtk_label_set_xalign (GTK_LABEL (label), 1.0);
gtk_widget_set_hexpand (label, TRUE);
gtk_grid_attach (GTK_GRID (grid), label, x, y, 1, 1);
gtk_widget_show (label);
editor->labels[i] =
label = g_object_new (GTK_TYPE_LABEL,
"xalign", 0.0,
"yalign", 0.5,
"width-chars", i > 2 ? 9 : 5,
NULL);
gimp_label_set_attributes (GTK_LABEL (editor->labels[i]),
PANGO_ATTR_SCALE, PANGO_SCALE_SMALL,
-1);
gtk_grid_attach (GTK_GRID (grid), label, x + 1, y, 1, 1);
gtk_widget_show (label);
}
}
static void
gimp_histogram_editor_docked_iface_init (GimpDockedInterface *docked_iface)
{
parent_docked_iface = g_type_interface_peek_parent (docked_iface);
if (! parent_docked_iface)
parent_docked_iface = g_type_default_interface_peek (GIMP_TYPE_DOCKED);
docked_iface->set_aux_info = gimp_histogram_editor_set_aux_info;
docked_iface->get_aux_info = gimp_histogram_editor_get_aux_info;
}
static void
gimp_histogram_editor_finalize (GObject *object)
{
if (GIMP_HISTOGRAM_EDITOR (object)->idle_id)
g_source_remove (GIMP_HISTOGRAM_EDITOR (object)->idle_id);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_histogram_editor_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpHistogramEditor *editor = GIMP_HISTOGRAM_EDITOR (object);
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
switch (property_id)
{
case PROP_TRC:
editor->trc = g_value_get_enum (value);
if (editor->histogram)
{
g_clear_object (&editor->histogram);
gimp_histogram_view_set_histogram (view, NULL);
}
if (editor->bg_histogram)
{
g_clear_object (&editor->bg_histogram);
gimp_histogram_view_set_background (view, NULL);
}
gimp_histogram_editor_update (editor);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_histogram_editor_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpHistogramEditor *editor = GIMP_HISTOGRAM_EDITOR (object);
switch (property_id)
{
case PROP_TRC:
g_value_set_enum (value, editor->trc);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_histogram_editor_set_aux_info (GimpDocked *docked,
GList *aux_info)
{
GimpHistogramEditor *editor = GIMP_HISTOGRAM_EDITOR (docked);
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
parent_docked_iface->set_aux_info (docked, aux_info);
gimp_session_info_aux_set_props (G_OBJECT (view), aux_info,
"histogram-channel",
"histogram-scale",
NULL);
}
static GList *
gimp_histogram_editor_get_aux_info (GimpDocked *docked)
{
GimpHistogramEditor *editor = GIMP_HISTOGRAM_EDITOR (docked);
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
GList *aux_info;
aux_info = parent_docked_iface->get_aux_info (docked);
return g_list_concat (aux_info,
gimp_session_info_aux_new_from_props (G_OBJECT (view),
"histogram-channel",
"histogram-scale",
NULL));
}
static void
gimp_histogram_editor_set_image (GimpImageEditor *image_editor,
GimpImage *image)
{
GimpHistogramEditor *editor = GIMP_HISTOGRAM_EDITOR (image_editor);
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
if (image_editor->image)
{
if (editor->idle_id)
{
g_source_remove (editor->idle_id);
editor->idle_id = 0;
}
editor->update_pending = FALSE;
g_signal_handlers_disconnect_by_func (image_editor->image,
gimp_histogram_editor_update,
editor);
g_signal_handlers_disconnect_by_func (image_editor->image,
gimp_histogram_editor_layer_changed,
editor);
g_signal_handlers_disconnect_by_func (image_editor->image,
gimp_histogram_editor_menu_update,
editor);
if (editor->histogram)
{
g_clear_object (&editor->histogram);
gimp_histogram_view_set_histogram (view, NULL);
}
if (editor->bg_histogram)
{
g_clear_object (&editor->bg_histogram);
gimp_histogram_view_set_background (view, NULL);
}
}
GIMP_IMAGE_EDITOR_CLASS (parent_class)->set_image (image_editor, image);
if (image)
{
g_signal_connect_object (image, "mode-changed",
G_CALLBACK (gimp_histogram_editor_menu_update),
editor, G_CONNECT_SWAPPED);
g_signal_connect_object (image, "selected-layers-changed",
G_CALLBACK (gimp_histogram_editor_layer_changed),
editor, 0);
g_signal_connect_object (image, "mask-changed",
G_CALLBACK (gimp_histogram_editor_update),
editor, G_CONNECT_SWAPPED);
}
gimp_histogram_editor_layer_changed (image, editor);
}
GtkWidget *
gimp_histogram_editor_new (void)
{
return g_object_new (GIMP_TYPE_HISTOGRAM_EDITOR, NULL);
}
static void
gimp_histogram_editor_layer_changed (GimpImage *image,
GimpHistogramEditor *editor)
{
if (editor->drawable)
{
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
if (editor->histogram)
{
g_clear_object (&editor->histogram);
gimp_histogram_view_set_histogram (view, NULL);
}
if (editor->bg_histogram)
{
g_clear_object (&editor->bg_histogram);
gimp_histogram_view_set_background (view, NULL);
}
g_signal_handlers_disconnect_by_func (editor->drawable,
gimp_histogram_editor_name_update,
editor);
g_signal_handlers_disconnect_by_func (editor->drawable,
gimp_histogram_editor_menu_update,
editor);
g_signal_handlers_disconnect_by_func (editor->drawable,
gimp_histogram_editor_update,
editor);
g_signal_handlers_disconnect_by_func (editor->drawable,
gimp_histogram_editor_buffer_update,
editor);
g_signal_handlers_disconnect_by_func (editor->drawable,
gimp_histogram_editor_frozen_update,
editor);
editor->drawable = NULL;
}
if (image)
{
GList *layers;
layers = gimp_image_get_selected_layers (image);
/*
* TODO: right now, we only support making an histogram for a single
* layer. In future, it would be nice to have the ability to make the
* histogram for:
* - all individual pixels of selected layers;
* - the merged composition of selected layers;
* - the visible image.
*/
editor->drawable = (g_list_length (layers) == 1 ? layers->data : NULL);
}
gimp_histogram_editor_menu_update (editor);
if (editor->drawable)
{
g_signal_connect_object (editor->drawable, "notify::frozen",
G_CALLBACK (gimp_histogram_editor_frozen_update),
editor, G_CONNECT_SWAPPED);
g_signal_connect_object (editor->drawable, "notify::buffer",
G_CALLBACK (gimp_histogram_editor_buffer_update),
editor, G_CONNECT_SWAPPED);
g_signal_connect_object (editor->drawable, "update",
G_CALLBACK (gimp_histogram_editor_update),
editor, G_CONNECT_SWAPPED);
g_signal_connect_object (editor->drawable, "alpha-changed",
G_CALLBACK (gimp_histogram_editor_menu_update),
editor, G_CONNECT_SWAPPED);
g_signal_connect_object (editor->drawable, "name-changed",
G_CALLBACK (gimp_histogram_editor_name_update),
editor, G_CONNECT_SWAPPED);
gimp_histogram_editor_buffer_update (editor, NULL);
}
else if (editor->histogram)
{
editor->recompute = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (editor->box));
}
gimp_histogram_editor_info_update (editor);
gimp_histogram_editor_name_update (editor);
}
static void
gimp_histogram_editor_calculate_async_callback (GimpAsync *async,
GimpHistogramEditor *editor)
{
editor->calculate_async = NULL;
if (gimp_async_is_finished (async) && editor->histogram)
{
if (editor->bg_pending)
{
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
editor->bg_histogram = gimp_histogram_duplicate (editor->histogram);
gimp_histogram_view_set_background (view, editor->bg_histogram);
}
gimp_histogram_editor_info_update (editor);
}
editor->bg_pending = FALSE;
if (editor->update_pending)
gimp_histogram_editor_update (editor);
}
static gboolean
gimp_histogram_editor_validate (GimpHistogramEditor *editor)
{
if (editor->recompute || ! editor->histogram)
{
if (editor->drawable &&
/* avoid calculating the histogram of a detached layer. this can
* happen during gimp_image_remove_layer(), as a result of a pending
* "expose-event" signal (handled in
* gimp_histogram_editor_view_expose()) executed through
* gtk_tree_view_clamp_node_visible(), as a result of the
* GimpLayerTreeView in the Layers dialog receiving the image's
* "selected-layers-changed" signal before us. See bug #795716,
* comment 6.
*/
gimp_item_is_attached (GIMP_ITEM (editor->drawable)))
{
GimpAsync *async;
if (! editor->histogram)
{
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
editor->histogram = gimp_histogram_new (editor->trc);
gimp_histogram_clear_values (
editor->histogram,
babl_format_get_n_components (
gimp_drawable_get_format (editor->drawable)));
gimp_histogram_view_set_histogram (view, editor->histogram);
}
async = gimp_drawable_calculate_histogram_async (editor->drawable,
editor->histogram,
TRUE);
editor->calculate_async = async;
gimp_async_add_callback (
async,
(GimpAsyncCallback) gimp_histogram_editor_calculate_async_callback,
editor);
g_object_unref (async);
}
else if (editor->histogram)
{
gimp_histogram_clear_values (editor->histogram, 0);
gimp_histogram_editor_info_update (editor);
}
editor->recompute = FALSE;
if (editor->idle_id)
{
g_source_remove (editor->idle_id);
editor->idle_id = 0;
}
}
return (editor->histogram != NULL);
}
static void
gimp_histogram_editor_frozen_update (GimpHistogramEditor *editor,
const GParamSpec *pspec)
{
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
if (gimp_viewable_preview_is_frozen (GIMP_VIEWABLE (editor->drawable)))
{
/* Only do the background histogram if the histogram is visible.
* This is a workaround for the fact that recalculating the
* histogram is expensive and that it is only validated when it
* is shown. So don't slow down painting by doing something that
* is not even seen by the user.
*/
if (! editor->bg_histogram &&
gtk_widget_is_drawable (GTK_WIDGET (editor)))
{
if (editor->idle_id)
{
g_source_remove (editor->idle_id);
gimp_histogram_editor_idle_update (editor);
}
if (gimp_histogram_editor_validate (editor))
{
if (editor->calculate_async)
{
editor->bg_pending = TRUE;
}
else
{
editor->bg_histogram = gimp_histogram_duplicate (
editor->histogram);
gimp_histogram_view_set_background (view,
editor->bg_histogram);
}
}
}
}
else
{
if (editor->bg_histogram)
{
g_clear_object (&editor->bg_histogram);
gimp_histogram_view_set_background (view, NULL);
}
editor->bg_pending = FALSE;
if (editor->update_pending)
gimp_async_cancel_and_wait (editor->calculate_async);
}
}
static void
gimp_histogram_editor_buffer_update (GimpHistogramEditor *editor,
const GParamSpec *pspec)
{
g_object_set (editor,
"trc", gimp_drawable_get_trc (editor->drawable),
NULL);
}
static void
gimp_histogram_editor_update (GimpHistogramEditor *editor)
{
if (editor->bg_pending)
{
editor->update_pending = TRUE;
return;
}
editor->update_pending = FALSE;
if (editor->calculate_async)
gimp_async_cancel_and_wait (editor->calculate_async);
if (editor->idle_id)
g_source_remove (editor->idle_id);
editor->idle_id =
g_timeout_add_full (G_PRIORITY_LOW,
200,
(GSourceFunc) gimp_histogram_editor_idle_update,
editor,
NULL);
}
static gboolean
gimp_histogram_editor_idle_update (GimpHistogramEditor *editor)
{
editor->idle_id = 0;
/* Mark the histogram for recomputation and queue a redraw.
* We will then recalculate the histogram when the view is exposed.
*/
editor->recompute = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (editor->box));
return FALSE;
}
static gboolean
gimp_histogram_menu_sensitivity (gint value,
gpointer data)
{
GimpHistogramEditor *editor = GIMP_HISTOGRAM_EDITOR (data);
GimpHistogramChannel channel = value;
if (editor->histogram)
return gimp_histogram_has_channel (editor->histogram, channel);
return FALSE;
}
static void
gimp_histogram_editor_menu_update (GimpHistogramEditor *editor)
{
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
gtk_widget_queue_draw (editor->menu);
if (editor->histogram &&
! gimp_histogram_has_channel (editor->histogram, view->channel))
{
gimp_histogram_view_set_channel (view, GIMP_HISTOGRAM_VALUE);
}
}
static void
gimp_histogram_editor_name_update (GimpHistogramEditor *editor)
{
const gchar *name = NULL;
if (editor->drawable)
name = gimp_object_get_name (editor->drawable);
gimp_editor_set_name (GIMP_EDITOR (editor), name);
}
static void
gimp_histogram_editor_info_update (GimpHistogramEditor *editor)
{
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
GimpHistogram *hist = editor->histogram;
if (hist)
{
gint n_bins;
gdouble pixels;
gdouble count;
gchar text[12];
n_bins = gimp_histogram_n_bins (hist);
pixels = gimp_histogram_get_count (hist, view->channel, 0, n_bins - 1);
count = gimp_histogram_get_count (hist, view->channel,
view->start, view->end);
/* For the RGB histogram, we need to divide by three
* since it combines three histograms in one */
if (view->channel == GIMP_HISTOGRAM_RGB)
{
pixels /= 3;
count /= 3;
}
g_snprintf (text, sizeof (text), "%.3f",
gimp_histogram_get_mean (hist, view->channel,
view->start, view->end));
gtk_label_set_text (GTK_LABEL (editor->labels[0]), text);
g_snprintf (text, sizeof (text), "%.3f",
gimp_histogram_get_std_dev (hist, view->channel,
view->start, view->end));
gtk_label_set_text (GTK_LABEL (editor->labels[1]), text);
g_snprintf (text, sizeof (text), "%.3f",
gimp_histogram_get_median (hist, view->channel,
view->start,
view->end));
gtk_label_set_text (GTK_LABEL (editor->labels[2]), text);
g_snprintf (text, sizeof (text), "%d", (gint) pixels);
gtk_label_set_text (GTK_LABEL (editor->labels[3]), text);
g_snprintf (text, sizeof (text), "%d", (gint) count);
gtk_label_set_text (GTK_LABEL (editor->labels[4]), text);
g_snprintf (text, sizeof (text), "%.1f", (pixels > 0 ?
(100.0 * count / pixels) :
0.0));
gtk_label_set_text (GTK_LABEL (editor->labels[5]), text);
}
else
{
gint i;
for (i = 0; i < 6; i++)
gtk_label_set_text (GTK_LABEL (editor->labels[i]), NULL);
}
}
static gboolean
gimp_histogram_editor_view_draw (GimpHistogramEditor *editor,
cairo_t *cr)
{
gimp_histogram_editor_validate (editor);
return FALSE;
}
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