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Diffstat (limited to 'app/tools/gimpthresholdtool.c')
| -rw-r--r-- | app/tools/gimpthresholdtool.c | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/app/tools/gimpthresholdtool.c b/app/tools/gimpthresholdtool.c new file mode 100644 index 0000000..3b21d72 --- /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); + } +} |