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-rw-r--r--app/tools/gimpthresholdtool.c436
1 files changed, 436 insertions, 0 deletions
diff --git a/app/tools/gimpthresholdtool.c b/app/tools/gimpthresholdtool.c
new file mode 100644
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--- /dev/null
+++ b/app/tools/gimpthresholdtool.c
@@ -0,0 +1,436 @@
+/* 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 "libgimpconfig/gimpconfig.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "tools-types.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/gimphistogram.h"
+#include "core/gimpimage.h"
+#include "core/gimptoolinfo.h"
+#include "core/gimptriviallycancelablewaitable.h"
+#include "core/gimpwaitable.h"
+
+#include "widgets/gimphelp-ids.h"
+#include "widgets/gimphistogrambox.h"
+#include "widgets/gimphistogramview.h"
+
+#include "display/gimpdisplay.h"
+
+#include "gimphistogramoptions.h"
+#include "gimpthresholdtool.h"
+#include "gimptooloptions-gui.h"
+
+#include "gimp-intl.h"
+
+
+/* local function prototypes */
+
+static void gimp_threshold_tool_finalize (GObject *object);
+
+static gboolean gimp_threshold_tool_initialize (GimpTool *tool,
+ GimpDisplay *display,
+ GError **error);
+
+static gchar * gimp_threshold_tool_get_operation (GimpFilterTool *filter_tool,
+ gchar **description);
+static void gimp_threshold_tool_dialog (GimpFilterTool *filter_tool);
+static void gimp_threshold_tool_config_notify (GimpFilterTool *filter_tool,
+ GimpConfig *config,
+ const GParamSpec *pspec);
+
+static gboolean gimp_threshold_tool_channel_sensitive
+ (gint value,
+ gpointer data);
+static void gimp_threshold_tool_histogram_range (GimpHistogramView *view,
+ gint start,
+ gint end,
+ GimpThresholdTool *t_tool);
+static void gimp_threshold_tool_auto_clicked (GtkWidget *button,
+ GimpThresholdTool *t_tool);
+
+
+G_DEFINE_TYPE (GimpThresholdTool, gimp_threshold_tool,
+ GIMP_TYPE_FILTER_TOOL)
+
+#define parent_class gimp_threshold_tool_parent_class
+
+
+void
+gimp_threshold_tool_register (GimpToolRegisterCallback callback,
+ gpointer data)
+{
+ (* callback) (GIMP_TYPE_THRESHOLD_TOOL,
+ GIMP_TYPE_HISTOGRAM_OPTIONS,
+ NULL,
+ 0,
+ "gimp-threshold-tool",
+ _("Threshold"),
+ _("Reduce image to two colors using a threshold"),
+ N_("_Threshold..."), NULL,
+ NULL, GIMP_HELP_TOOL_THRESHOLD,
+ GIMP_ICON_TOOL_THRESHOLD,
+ data);
+}
+
+static void
+gimp_threshold_tool_class_init (GimpThresholdToolClass *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_threshold_tool_finalize;
+
+ tool_class->initialize = gimp_threshold_tool_initialize;
+
+ filter_tool_class->get_operation = gimp_threshold_tool_get_operation;
+ filter_tool_class->dialog = gimp_threshold_tool_dialog;
+ filter_tool_class->config_notify = gimp_threshold_tool_config_notify;
+}
+
+static void
+gimp_threshold_tool_init (GimpThresholdTool *t_tool)
+{
+ t_tool->histogram = gimp_histogram_new (FALSE);
+}
+
+static void
+gimp_threshold_tool_finalize (GObject *object)
+{
+ GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (object);
+
+ g_clear_object (&t_tool->histogram);
+ g_clear_object (&t_tool->histogram_async);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static gboolean
+gimp_threshold_tool_initialize (GimpTool *tool,
+ GimpDisplay *display,
+ GError **error)
+{
+ GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (tool);
+ GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (tool);
+ GimpImage *image = gimp_display_get_image (display);
+ GimpDrawable *drawable = gimp_image_get_active_drawable (image);
+ gdouble low;
+ gdouble high;
+ gint n_bins;
+
+ if (! GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error))
+ {
+ return FALSE;
+ }
+
+ g_clear_object (&t_tool->histogram_async);
+
+ g_object_get (filter_tool->config,
+ "low", &low,
+ "high", &high,
+ NULL);
+
+ /* this is a hack to make sure that
+ * 'gimp_histogram_n_bins (t_tool->histogram)' returns the correct value for
+ * 'drawable' before the asynchronous calculation of its histogram is
+ * finished.
+ */
+ {
+ GeglBuffer *temp;
+
+ temp = gegl_buffer_new (GEGL_RECTANGLE (0, 0, 1, 1),
+ gimp_drawable_get_format (drawable));
+
+ gimp_histogram_calculate (t_tool->histogram,
+ temp, GEGL_RECTANGLE (0, 0, 1, 1),
+ NULL, NULL);
+
+ g_object_unref (temp);
+ }
+
+ n_bins = gimp_histogram_n_bins (t_tool->histogram);
+
+ t_tool->histogram_async = gimp_drawable_calculate_histogram_async (
+ drawable, t_tool->histogram, FALSE);
+ gimp_histogram_view_set_histogram (t_tool->histogram_box->view,
+ t_tool->histogram);
+
+ gimp_histogram_view_set_range (t_tool->histogram_box->view,
+ low * (n_bins - 0.0001),
+ high * (n_bins - 0.0001));
+
+ return TRUE;
+}
+
+static gchar *
+gimp_threshold_tool_get_operation (GimpFilterTool *filter_tool,
+ gchar **description)
+{
+ *description = g_strdup (_("Apply Threshold"));
+
+ return g_strdup ("gimp:threshold");
+}
+
+
+/**********************/
+/* Threshold dialog */
+/**********************/
+
+static void
+gimp_threshold_tool_dialog (GimpFilterTool *filter_tool)
+{
+ GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (filter_tool);
+ GimpToolOptions *tool_options = GIMP_TOOL_GET_OPTIONS (filter_tool);
+ GtkWidget *main_vbox;
+ GtkWidget *main_frame;
+ GtkWidget *frame_vbox;
+ GtkWidget *hbox;
+ GtkWidget *label;
+ GtkWidget *hbox2;
+ GtkWidget *box;
+ GtkWidget *button;
+ GimpHistogramChannel channel;
+
+ main_vbox = gimp_filter_tool_dialog_get_vbox (filter_tool);
+
+ 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);
+
+ t_tool->channel_menu = gimp_prop_enum_combo_box_new (filter_tool->config,
+ "channel", -1, -1);
+ gimp_enum_combo_box_set_icon_prefix (GIMP_ENUM_COMBO_BOX (t_tool->channel_menu),
+ "gimp-channel");
+
+ gimp_int_combo_box_set_sensitivity (GIMP_INT_COMBO_BOX (t_tool->channel_menu),
+ gimp_threshold_tool_channel_sensitive,
+ filter_tool, NULL);
+
+ gtk_box_pack_start (GTK_BOX (hbox), t_tool->channel_menu, FALSE, FALSE, 0);
+ gtk_widget_show (t_tool->channel_menu);
+
+ gtk_label_set_mnemonic_widget (GTK_LABEL (label), t_tool->channel_menu);
+
+ 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);
+ gtk_widget_show (hbox2);
+
+ frame_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+ gtk_container_add (GTK_CONTAINER (main_frame), frame_vbox);
+ gtk_widget_show (frame_vbox);
+
+ box = gimp_histogram_box_new ();
+ gtk_box_pack_start (GTK_BOX (frame_vbox), box, TRUE, TRUE, 0);
+ gtk_widget_show (box);
+
+ t_tool->histogram_box = GIMP_HISTOGRAM_BOX (box);
+
+ g_object_get (filter_tool->config,
+ "channel", &channel,
+ NULL);
+
+ gimp_histogram_view_set_channel (t_tool->histogram_box->view, channel);
+
+ g_signal_connect (t_tool->histogram_box->view, "range-changed",
+ G_CALLBACK (gimp_threshold_tool_histogram_range),
+ t_tool);
+
+ g_object_bind_property (G_OBJECT (tool_options), "histogram-scale",
+ G_OBJECT (t_tool->histogram_box->view), "histogram-scale",
+ G_BINDING_SYNC_CREATE |
+ G_BINDING_BIDIRECTIONAL);
+
+ 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"));
+ gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+ gimp_help_set_help_data (button, _("Automatically adjust to optimal "
+ "binarization threshold"), NULL);
+ gtk_widget_show (button);
+
+ g_signal_connect (button, "clicked",
+ G_CALLBACK (gimp_threshold_tool_auto_clicked),
+ t_tool);
+}
+
+static void
+gimp_threshold_tool_config_notify (GimpFilterTool *filter_tool,
+ GimpConfig *config,
+ const GParamSpec *pspec)
+{
+ GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (filter_tool);
+
+ GIMP_FILTER_TOOL_CLASS (parent_class)->config_notify (filter_tool,
+ config, pspec);
+
+ if (! t_tool->histogram_box)
+ return;
+
+ if (! strcmp (pspec->name, "channel"))
+ {
+ GimpHistogramChannel channel;
+
+ g_object_get (config,
+ "channel", &channel,
+ NULL);
+
+ gimp_histogram_view_set_channel (t_tool->histogram_box->view,
+ channel);
+ }
+ else if (! strcmp (pspec->name, "low") ||
+ ! strcmp (pspec->name, "high"))
+ {
+ gdouble low;
+ gdouble high;
+ gint n_bins;
+
+ g_object_get (config,
+ "low", &low,
+ "high", &high,
+ NULL);
+
+ n_bins = gimp_histogram_n_bins (t_tool->histogram);
+
+ gimp_histogram_view_set_range (t_tool->histogram_box->view,
+ low * (n_bins - 0.0001),
+ high * (n_bins - 0.0001));
+ }
+}
+
+static gboolean
+gimp_threshold_tool_channel_sensitive (gint value,
+ gpointer data)
+{
+ GimpDrawable *drawable = GIMP_TOOL (data)->drawable;
+ GimpHistogramChannel channel = value;
+
+ if (!drawable)
+ return FALSE;
+
+ 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 gimp_drawable_is_rgb (drawable);
+
+ case GIMP_HISTOGRAM_LUMINANCE:
+ return gimp_drawable_is_rgb (drawable);
+ }
+
+ return FALSE;
+}
+
+static void
+gimp_threshold_tool_histogram_range (GimpHistogramView *widget,
+ gint start,
+ gint end,
+ GimpThresholdTool *t_tool)
+{
+ GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (t_tool);
+ gint n_bins = gimp_histogram_n_bins (t_tool->histogram);
+ gdouble low = (gdouble) start / (n_bins - 1);
+ gdouble high = (gdouble) end / (n_bins - 1);
+ gdouble config_low;
+ gdouble config_high;
+
+ g_object_get (filter_tool->config,
+ "low", &config_low,
+ "high", &config_high,
+ NULL);
+
+ if (low != config_low ||
+ high != config_high)
+ {
+ g_object_set (filter_tool->config,
+ "low", low,
+ "high", high,
+ NULL);
+ }
+}
+
+static void
+gimp_threshold_tool_auto_clicked (GtkWidget *button,
+ GimpThresholdTool *t_tool)
+{
+ GimpTool *tool = GIMP_TOOL (t_tool);
+ GimpWaitable *waitable;
+
+ waitable = gimp_trivially_cancelable_waitable_new (
+ GIMP_WAITABLE (t_tool->histogram_async));
+
+ gimp_wait (tool->tool_info->gimp, waitable, _("Calculating histogram..."));
+
+ g_object_unref (waitable);
+
+ if (gimp_async_is_synced (t_tool->histogram_async) &&
+ gimp_async_is_finished (t_tool->histogram_async))
+ {
+ GimpHistogramChannel channel;
+ gint n_bins;
+ gdouble low;
+
+ g_object_get (GIMP_FILTER_TOOL (t_tool)->config,
+ "channel", &channel,
+ NULL);
+
+ n_bins = gimp_histogram_n_bins (t_tool->histogram);
+
+ low = gimp_histogram_get_threshold (t_tool->histogram,
+ channel,
+ 0, n_bins - 1);
+
+ gimp_histogram_view_set_range (t_tool->histogram_box->view,
+ low, n_bins - 1);
+ }
+}
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