gimpcurvestool.c 32.6 KB
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/* GIMP - The GNU Image Manipulation Program
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 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 3 of the License, or
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 * (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
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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#include "config.h"

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#include <errno.h>

#include <glib/gstdio.h>
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#include <gegl.h>
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#include <gtk/gtk.h>

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#include "libgimpbase/gimpbase.h"
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpconfig/gimpconfig.h"
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#include "libgimpwidgets/gimpwidgets.h"
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#include "tools-types.h"
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#include "operations/gimpcurvesconfig.h"
#include "operations/gimpoperationcurves.h"
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#include "core/gimp.h"
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#include "core/gimpcurve.h"
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#include "core/gimpcurve-map.h"
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#include "core/gimpdrawable.h"
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#include "core/gimpdrawable-histogram.h"
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#include "core/gimperror.h"
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#include "core/gimphistogram.h"
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#include "core/gimpimage.h"

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#include "widgets/gimpcolorbar.h"
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#include "widgets/gimphelp-ids.h"
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#include "widgets/gimpcurveview.h"
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#include "widgets/gimpwidgets-utils.h"
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#include "display/gimpdisplay.h"

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#include "gimpcurvestool.h"
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#include "gimphistogramoptions.h"
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#include "gimp-intl.h"
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#define GRAPH_SIZE 256
#define BAR_SIZE    12
#define RADIUS       4
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/*  local function prototypes  */

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static gboolean   gimp_curves_tool_initialize      (GimpTool             *tool,
                                                    GimpDisplay          *display,
                                                    GError              **error);
static void       gimp_curves_tool_button_release  (GimpTool             *tool,
                                                    const GimpCoords     *coords,
                                                    guint32               time,
                                                    GdkModifierType       state,
                                                    GimpButtonReleaseType release_type,
                                                    GimpDisplay          *display);
static gboolean   gimp_curves_tool_key_press       (GimpTool             *tool,
                                                    GdkEventKey          *kevent,
                                                    GimpDisplay          *display);
static void       gimp_curves_tool_oper_update     (GimpTool             *tool,
                                                    const GimpCoords     *coords,
                                                    GdkModifierType       state,
                                                    gboolean              proximity,
                                                    GimpDisplay          *display);

static gchar    * gimp_curves_tool_get_operation   (GimpFilterTool       *filter_tool,
                                                    gchar               **title,
                                                    gchar               **description,
                                                    gchar               **undo_desc,
                                                    gchar               **icon_name,
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                                                    gchar               **help_id,
                                                    gboolean             *has_settings,
                                                    gchar               **import_dialog_title,
                                                    gchar               **export_dialog_title);
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static void       gimp_curves_tool_dialog          (GimpFilterTool       *filter_tool);
static void       gimp_curves_tool_reset           (GimpFilterTool       *filter_tool);
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static void       gimp_curves_tool_config_notify   (GimpFilterTool       *filter_tool,
                                                    GimpConfig           *config,
                                                    const GParamSpec     *pspec);
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static gboolean   gimp_curves_tool_settings_import (GimpFilterTool       *filter_tool,
                                                    GInputStream         *input,
                                                    GError              **error);
static gboolean   gimp_curves_tool_settings_export (GimpFilterTool       *filter_tool,
                                                    GOutputStream        *output,
                                                    GError              **error);
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static void       gimp_curves_tool_color_picked    (GimpFilterTool       *filter_tool,
                                                    gpointer              identifier,
                                                    gdouble               x,
                                                    gdouble               y,
                                                    const Babl           *sample_format,
                                                    const GimpRGB        *color);
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static void       gimp_curves_tool_export_setup    (GimpSettingsBox      *settings_box,
                                                    GtkFileChooserDialog *dialog,
                                                    gboolean              export,
                                                    GimpCurvesTool       *tool);
static void       gimp_curves_tool_update_channel  (GimpCurvesTool       *tool);

static void       curves_channel_callback          (GtkWidget            *widget,
                                                    GimpCurvesTool       *tool);
static void       curves_channel_reset_callback    (GtkWidget            *widget,
                                                    GimpCurvesTool       *tool);

static gboolean   curves_menu_sensitivity          (gint                  value,
                                                    gpointer              data);

static void       curves_curve_type_callback       (GtkWidget            *widget,
                                                    GimpCurvesTool       *tool);

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static gboolean   curves_get_channel_color         (GtkWidget            *widget,
                                                    GimpHistogramChannel  channel,
                                                    GimpRGB              *color);
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G_DEFINE_TYPE (GimpCurvesTool, gimp_curves_tool, GIMP_TYPE_FILTER_TOOL)
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#define parent_class gimp_curves_tool_parent_class
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/*  public functions  */
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void
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gimp_curves_tool_register (GimpToolRegisterCallback  callback,
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                           gpointer                  data)
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{
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  (* callback) (GIMP_TYPE_CURVES_TOOL,
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                GIMP_TYPE_HISTOGRAM_OPTIONS,
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                gimp_color_options_gui,
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                0,
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                "gimp-curves-tool",
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                _("Curves"),
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                _("Curves Tool: Adjust color curves"),
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                N_("_Curves..."), NULL,
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                NULL, GIMP_HELP_TOOL_CURVES,
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                GIMP_ICON_TOOL_CURVES,
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                data);
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}

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/*  private functions  */

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static void
gimp_curves_tool_class_init (GimpCurvesToolClass *klass)
{
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  GimpToolClass       *tool_class        = GIMP_TOOL_CLASS (klass);
  GimpFilterToolClass *filter_tool_class = GIMP_FILTER_TOOL_CLASS (klass);
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  tool_class->initialize             = gimp_curves_tool_initialize;
  tool_class->button_release         = gimp_curves_tool_button_release;
  tool_class->key_press              = gimp_curves_tool_key_press;
  tool_class->oper_update            = gimp_curves_tool_oper_update;
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  filter_tool_class->get_operation   = gimp_curves_tool_get_operation;
  filter_tool_class->dialog          = gimp_curves_tool_dialog;
  filter_tool_class->reset           = gimp_curves_tool_reset;
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  filter_tool_class->config_notify   = gimp_curves_tool_config_notify;
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  filter_tool_class->settings_import = gimp_curves_tool_settings_import;
  filter_tool_class->settings_export = gimp_curves_tool_settings_export;
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  filter_tool_class->color_picked    = gimp_curves_tool_color_picked;
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}

static void
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gimp_curves_tool_init (GimpCurvesTool *tool)
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{
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  gint i;
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  for (i = 0; i < G_N_ELEMENTS (tool->picked_color); i++)
    tool->picked_color[i] = -1.0;
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}

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static gboolean
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gimp_curves_tool_initialize (GimpTool     *tool,
                             GimpDisplay  *display,
                             GError      **error)
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{
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  GimpCurvesTool *c_tool      = GIMP_CURVES_TOOL (tool);
  GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (tool);
  GimpImage      *image       = gimp_display_get_image (display);
  GimpDrawable   *drawable    = gimp_image_get_active_drawable (image);
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  GimpHistogram  *histogram;
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  if (! GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error))
    {
      return FALSE;
    }
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  histogram = gimp_histogram_new (FALSE);
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  gimp_drawable_calculate_histogram (drawable, histogram);
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  gimp_histogram_view_set_background (GIMP_HISTOGRAM_VIEW (c_tool->graph),
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                                      histogram);
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  g_object_unref (histogram);
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  if (gimp_drawable_get_component_type (drawable) == GIMP_COMPONENT_TYPE_U8)
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    {
      gimp_curve_view_set_range_x (GIMP_CURVE_VIEW (c_tool->graph), 0, 255);
      gimp_curve_view_set_range_y (GIMP_CURVE_VIEW (c_tool->graph), 0, 255);
    }
  else
    {
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      gimp_curve_view_set_range_x (GIMP_CURVE_VIEW (c_tool->graph), 0, 100);
      gimp_curve_view_set_range_y (GIMP_CURVE_VIEW (c_tool->graph), 0, 100);
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    }

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  /*  always pick colors  */
  gimp_filter_tool_enable_color_picking (filter_tool, NULL, FALSE);

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  return TRUE;
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}

static void
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gimp_curves_tool_button_release (GimpTool              *tool,
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                                 const GimpCoords      *coords,
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                                 guint32                time,
                                 GdkModifierType        state,
                                 GimpButtonReleaseType  release_type,
                                 GimpDisplay           *display)
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{
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  GimpCurvesTool   *c_tool      = GIMP_CURVES_TOOL (tool);
  GimpFilterTool   *filter_tool = GIMP_FILTER_TOOL (tool);
  GimpCurvesConfig *config      = GIMP_CURVES_CONFIG (filter_tool->config);
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  if (state & gimp_get_extend_selection_mask ())
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    {
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      GimpCurve *curve = config->curve[config->channel];
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      gdouble    value = c_tool->picked_color[config->channel];
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      gint       closest;
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      closest = gimp_curve_get_closest_point (curve, value);
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      gimp_curve_view_set_selected (GIMP_CURVE_VIEW (c_tool->graph),
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                                    closest);
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      gimp_curve_set_point (curve, closest,
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                            value, gimp_curve_map_value (curve, value));
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    }
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  else if (state & gimp_get_toggle_behavior_mask ())
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    {
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      GimpHistogramChannel channel;
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      for (channel = GIMP_HISTOGRAM_VALUE;
           channel <= GIMP_HISTOGRAM_ALPHA;
           channel++)
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        {
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          GimpCurve *curve = config->curve[channel];
          gdouble    value = c_tool->picked_color[channel];
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          gint       closest;
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          if (value != -1)
            {
              closest = gimp_curve_get_closest_point (curve, value);
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              gimp_curve_view_set_selected (GIMP_CURVE_VIEW (c_tool->graph),
                                            closest);
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              gimp_curve_set_point (curve, closest,
                                    value, gimp_curve_map_value (curve, value));
            }
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        }
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    }

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  /*  chain up to halt the tool */
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  GIMP_TOOL_CLASS (parent_class)->button_release (tool, coords, time, state,
                                                  release_type, display);
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}

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static gboolean
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gimp_curves_tool_key_press (GimpTool    *tool,
                            GdkEventKey *kevent,
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                            GimpDisplay *display)
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{
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  GimpCurvesTool *c_tool = GIMP_CURVES_TOOL (tool);

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  if (tool->display && c_tool->graph)
    {
      if (gtk_widget_event (c_tool->graph, (GdkEvent *) kevent))
        return TRUE;
    }
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  return GIMP_TOOL_CLASS (parent_class)->key_press (tool, kevent, display);
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}

static void
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gimp_curves_tool_oper_update (GimpTool         *tool,
                              const GimpCoords *coords,
                              GdkModifierType   state,
                              gboolean          proximity,
                              GimpDisplay      *display)
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{
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  if (gimp_filter_tool_on_guide (GIMP_FILTER_TOOL (tool),
                                 coords, display))
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    {
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      GIMP_TOOL_CLASS (parent_class)->oper_update (tool, coords, state, proximity,
                                                   display);
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    }
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  else
    {
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      GimpColorPickMode  mode;
      gchar             *status      = NULL;
      GdkModifierType    extend_mask = gimp_get_extend_selection_mask ();
      GdkModifierType    toggle_mask = gimp_get_toggle_behavior_mask ();
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      gimp_tool_pop_status (tool, display);
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      if (state & extend_mask)
        {
          mode   = GIMP_COLOR_PICK_MODE_PALETTE;
          status = g_strdup (_("Click to add a control point"));
        }
      else if (state & toggle_mask)
        {
          mode   = GIMP_COLOR_PICK_MODE_PALETTE;
          status = g_strdup (_("Click to add control points to all channels"));
        }
      else
        {
          mode   = GIMP_COLOR_PICK_MODE_NONE;
          status = gimp_suggest_modifiers (_("Click to locate on curve"),
                                           (extend_mask | toggle_mask) & ~state,
                                           _("%s: add control point"),
                                           _("%s: add control points to all channels"),
                                           NULL);
        }
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      GIMP_COLOR_TOOL (tool)->pick_mode = mode;

      if (proximity)
        gimp_tool_push_status (tool, display, "%s", status);

      g_free (status);
    }
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}

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static gchar *
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gimp_curves_tool_get_operation (GimpFilterTool  *filter_tool,
                                gchar          **title,
                                gchar          **description,
                                gchar          **undo_desc,
                                gchar          **icon_name,
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                                gchar          **help_id,
                                gboolean        *has_settings,
                                gchar          **import_dialog_title,
                                gchar          **export_dialog_title)
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{
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  *description         = g_strdup (_("Adjust Color Curves"));
  *has_settings        = TRUE;
  *import_dialog_title = g_strdup (_("Import Curves"));
  *export_dialog_title = g_strdup (_("Export Curves"));
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  return g_strdup ("gimp:curves");
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}
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/*******************/
/*  Curves dialog  */
/*******************/
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static void
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gimp_curves_tool_dialog (GimpFilterTool *filter_tool)
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{
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  GimpCurvesTool   *tool         = GIMP_CURVES_TOOL (filter_tool);
  GimpToolOptions  *tool_options = GIMP_TOOL_GET_OPTIONS (filter_tool);
  GimpCurvesConfig *config       = GIMP_CURVES_CONFIG (filter_tool->config);
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  GtkListStore     *store;
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  GtkWidget        *main_vbox;
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  GtkWidget        *frame_vbox;
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  GtkWidget        *vbox;
  GtkWidget        *hbox;
  GtkWidget        *hbox2;
  GtkWidget        *label;
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  GtkWidget        *main_frame;
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  GtkWidget        *frame;
  GtkWidget        *table;
  GtkWidget        *button;
  GtkWidget        *bar;
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  GtkWidget        *combo;
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  g_signal_connect (filter_tool->settings_box, "file-dialog-setup",
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                    G_CALLBACK (gimp_curves_tool_export_setup),
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                    filter_tool);
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  main_vbox = gimp_filter_tool_dialog_get_vbox (filter_tool);
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  /*  The combo box for selecting channels  */
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  main_frame = gimp_frame_new (NULL);
  gtk_box_pack_start (GTK_BOX (main_vbox), main_frame, TRUE, TRUE, 0);
  gtk_widget_show (main_frame);

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  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
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  gtk_frame_set_label_widget (GTK_FRAME (main_frame), hbox);
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  gtk_widget_show (hbox);

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  label = gtk_label_new_with_mnemonic (_("Cha_nnel:"));
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  gimp_label_set_attributes (GTK_LABEL (label),
                             PANGO_ATTR_WEIGHT, PANGO_WEIGHT_BOLD,
                             -1);
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  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
  gtk_widget_show (label);

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  store = gimp_enum_store_new_with_range (GIMP_TYPE_HISTOGRAM_CHANNEL,
                                          GIMP_HISTOGRAM_VALUE,
                                          GIMP_HISTOGRAM_ALPHA);
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  tool->channel_menu =
    gimp_enum_combo_box_new_with_model (GIMP_ENUM_STORE (store));
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  g_object_unref (store);

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  gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (tool->channel_menu),
                                 config->channel);
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  gimp_enum_combo_box_set_icon_prefix (GIMP_ENUM_COMBO_BOX (tool->channel_menu),
                                       "gimp-channel");
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  gimp_int_combo_box_set_sensitivity (GIMP_INT_COMBO_BOX (tool->channel_menu),
                                      curves_menu_sensitivity, filter_tool, NULL);
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  gtk_box_pack_start (GTK_BOX (hbox), tool->channel_menu, FALSE, FALSE, 0);
  gtk_widget_show (tool->channel_menu);
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  g_signal_connect (tool->channel_menu, "changed",
                    G_CALLBACK (curves_channel_callback),
                    tool);
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  gtk_label_set_mnemonic_widget (GTK_LABEL (label), tool->channel_menu);
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  button = gtk_button_new_with_mnemonic (_("R_eset Channel"));
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  gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
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  gtk_widget_show (button);
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  g_signal_connect (button, "clicked",
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                    G_CALLBACK (curves_channel_reset_callback),
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                    tool);
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  /*  The histogram scale radio buttons  */
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  hbox2 = gimp_prop_enum_icon_box_new (G_OBJECT (tool_options),
                                       "histogram-scale", "gimp-histogram",
                                       0, 0);
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  gtk_box_pack_end (GTK_BOX (hbox), hbox2, FALSE, FALSE, 0);
  gtk_widget_show (hbox2);
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  frame_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
  gtk_container_add (GTK_CONTAINER (main_frame), frame_vbox);
  gtk_widget_show (frame_vbox);

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  /*  The table for the color bars and the graph  */
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  table = gtk_table_new (2, 2, FALSE);
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  gtk_table_set_col_spacings (GTK_TABLE (table), 2);
  gtk_table_set_row_spacings (GTK_TABLE (table), 2);
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  gtk_box_pack_start (GTK_BOX (frame_vbox), table, TRUE, TRUE, 0);
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  /*  The left color bar  */
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  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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  gtk_table_attach (GTK_TABLE (table), vbox, 0, 1, 0, 1,
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                    GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
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  gtk_widget_show (vbox);
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  frame = gtk_frame_new (NULL);
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  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
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  gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, RADIUS);
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  gtk_widget_show (frame);

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  tool->yrange = gimp_color_bar_new (GTK_ORIENTATION_VERTICAL);
  gtk_widget_set_size_request (tool->yrange, BAR_SIZE, -1);
  gtk_container_add (GTK_CONTAINER (frame), tool->yrange);
  gtk_widget_show (tool->yrange);
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  /*  The curves graph  */
  frame = gtk_frame_new (NULL);
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  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
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  gtk_table_attach (GTK_TABLE (table), frame, 1, 2, 0, 1,
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                    GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
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  gtk_widget_show (frame);
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  tool->graph = gimp_curve_view_new ();
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  gimp_curve_view_set_range_x (GIMP_CURVE_VIEW (tool->graph), 0, 255);
  gimp_curve_view_set_range_y (GIMP_CURVE_VIEW (tool->graph), 0, 255);
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  gtk_widget_set_size_request (tool->graph,
                               GRAPH_SIZE + RADIUS * 2,
                               GRAPH_SIZE + RADIUS * 2);
  g_object_set (tool->graph,
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                "border-width", RADIUS,
                "subdivisions", 1,
                NULL);
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  gtk_container_add (GTK_CONTAINER (frame), tool->graph);
  gtk_widget_show (tool->graph);
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  g_object_bind_property (G_OBJECT (tool_options), "histogram-scale",
                          G_OBJECT (tool->graph),  "histogram-scale",
                          G_BINDING_SYNC_CREATE |
                          G_BINDING_BIDIRECTIONAL);
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  /*  The bottom color bar  */
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  hbox2 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
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  gtk_table_attach (GTK_TABLE (table), hbox2, 1, 2, 1, 2,
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                    GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
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  gtk_widget_show (hbox2);
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  frame = gtk_frame_new (NULL);
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  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
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  gtk_box_pack_start (GTK_BOX (hbox2), frame, TRUE, TRUE, RADIUS);
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  gtk_widget_show (frame);

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  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
  gtk_box_set_homogeneous (GTK_BOX (vbox), TRUE);
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  gtk_container_add (GTK_CONTAINER (frame), vbox);
  gtk_widget_show (vbox);
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  tool->xrange = gimp_color_bar_new (GTK_ORIENTATION_HORIZONTAL);
  gtk_widget_set_size_request (tool->xrange, -1, BAR_SIZE / 2);
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  gtk_box_pack_start (GTK_BOX (vbox), tool->xrange, TRUE, TRUE, 0);
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  gtk_widget_show (tool->xrange);
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  bar = gimp_color_bar_new (GTK_ORIENTATION_HORIZONTAL);
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  gtk_box_pack_start (GTK_BOX (vbox), bar, TRUE, TRUE, 0);
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  gtk_widget_show (bar);

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  gtk_widget_show (table);
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  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
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  gtk_box_pack_end (GTK_BOX (frame_vbox), hbox, FALSE, FALSE, 0);
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  gtk_widget_show (hbox);
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  label = gtk_label_new_with_mnemonic (_("Curve _type:"));
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
  gtk_widget_show (label);
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  tool->curve_type = combo = gimp_enum_combo_box_new (GIMP_TYPE_CURVE_TYPE);
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  gimp_enum_combo_box_set_icon_prefix (GIMP_ENUM_COMBO_BOX (combo),
                                       "gimp-curve");
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  gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo), 0,
                              G_CALLBACK (curves_curve_type_callback),
                              tool);
  gtk_box_pack_start (GTK_BOX (hbox), combo, TRUE, TRUE, 0);
  gtk_widget_show (combo);
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  gtk_label_set_mnemonic_widget (GTK_LABEL (label), combo);
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  gimp_curves_tool_update_channel (tool);
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}

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static void
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gimp_curves_tool_reset (GimpFilterTool *filter_tool)
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{
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  GimpCurvesConfig     *config = GIMP_CURVES_CONFIG (filter_tool->config);
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  GimpCurvesConfig     *default_config;
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  GimpHistogramChannel  channel;
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  default_config = GIMP_CURVES_CONFIG (filter_tool->default_config);
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  for (channel = GIMP_HISTOGRAM_VALUE;
       channel <= GIMP_HISTOGRAM_ALPHA;
       channel++)
    {
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      if (default_config)
        {
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          GimpCurveType curve_type = config->curve[channel]->curve_type;
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          g_object_freeze_notify (G_OBJECT (config->curve[channel]));
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          gimp_config_copy (GIMP_CONFIG (default_config->curve[channel]),
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                            GIMP_CONFIG (config->curve[channel]),
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                            0);

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          g_object_set (config->curve[channel],
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                        "curve-type", curve_type,
                        NULL);

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          g_object_thaw_notify (G_OBJECT (config->curve[channel]));
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        }
      else
        {
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          gimp_curve_reset (config->curve[channel], FALSE);
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        }
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    }
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}

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static void
gimp_curves_tool_config_notify (GimpFilterTool   *filter_tool,
                                GimpConfig       *config,
                                const GParamSpec *pspec)
{
  GimpCurvesTool   *curves_tool   = GIMP_CURVES_TOOL (filter_tool);
  GimpCurvesConfig *curves_config = GIMP_CURVES_CONFIG (config);
  GimpCurve        *curve         = curves_config->curve[curves_config->channel];

  GIMP_FILTER_TOOL_CLASS (parent_class)->config_notify (filter_tool,
                                                        config, pspec);

  if (! curves_tool->xrange)
    return;

  if (! strcmp (pspec->name, "channel"))
    {
      gimp_curves_tool_update_channel (GIMP_CURVES_TOOL (filter_tool));
    }
  else if (! strcmp (pspec->name, "curve"))
    {
      gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (curves_tool->curve_type),
                                     curve->curve_type);
    }
}

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static gboolean
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gimp_curves_tool_settings_import (GimpFilterTool  *filter_tool,
                                  GInputStream    *input,
                                  GError         **error)
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{
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  GimpCurvesConfig *config = GIMP_CURVES_CONFIG (filter_tool->config);
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  gchar             header[64];
  gsize             bytes_read;
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  if (! g_input_stream_read_all (input, header, sizeof (header),
                                 &bytes_read, NULL, error) ||
      bytes_read != sizeof (header))
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    {
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      g_prefix_error (error, _("Could not read header: "));
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      return FALSE;
    }

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  g_seekable_seek (G_SEEKABLE (input), 0, G_SEEK_SET, NULL, NULL);
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  if (g_str_has_prefix (header, "# GIMP Curves File\n"))
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    return gimp_curves_config_load_cruft (config, input, error);
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  return GIMP_FILTER_TOOL_CLASS (parent_class)->settings_import (filter_tool,
                                                                 input,
                                                                 error);
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}

static gboolean
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gimp_curves_tool_settings_export (GimpFilterTool  *filter_tool,
                                  GOutputStream   *output,
                                  GError         **error)
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{
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  GimpCurvesTool   *tool   = GIMP_CURVES_TOOL (filter_tool);
  GimpCurvesConfig *config = GIMP_CURVES_CONFIG (filter_tool->config);
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  if (tool->export_old_format)
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    return gimp_curves_config_save_cruft (config, output, error);
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  return GIMP_FILTER_TOOL_CLASS (parent_class)->settings_export (filter_tool,
                                                                 output,
                                                                 error);
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}

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static void
gimp_curves_tool_color_picked (GimpFilterTool *filter_tool,
                               gpointer        identifier,
                               gdouble         x,
                               gdouble         y,
                               const Babl     *sample_format,
                               const GimpRGB  *color)
{
  GimpCurvesTool   *tool   = GIMP_CURVES_TOOL (filter_tool);
  GimpCurvesConfig *config = GIMP_CURVES_CONFIG (filter_tool->config);
  GimpDrawable     *drawable;

  drawable = GIMP_FILTER_TOOL (tool)->drawable;

  tool->picked_color[GIMP_HISTOGRAM_RED]   = color->r;
  tool->picked_color[GIMP_HISTOGRAM_GREEN] = color->g;
  tool->picked_color[GIMP_HISTOGRAM_BLUE]  = color->b;

  if (gimp_drawable_has_alpha (drawable))
    tool->picked_color[GIMP_HISTOGRAM_ALPHA] = color->a;
  else
    tool->picked_color[GIMP_HISTOGRAM_ALPHA] = -1;

  tool->picked_color[GIMP_HISTOGRAM_VALUE] = MAX (MAX (color->r, color->g),
                                                  color->b);

  gimp_curve_view_set_xpos (GIMP_CURVE_VIEW (tool->graph),
                            tool->picked_color[config->channel]);
}

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static void
gimp_curves_tool_export_setup (GimpSettingsBox      *settings_box,
                               GtkFileChooserDialog *dialog,
                               gboolean              export,
                               GimpCurvesTool       *tool)
{
  GtkWidget *button;
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  if (! export)
    return;

  button = gtk_check_button_new_with_mnemonic (_("Use _old curves 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);
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  g_signal_connect (button, "toggled",
                    G_CALLBACK (gimp_toggle_button_update),
                    &tool->export_old_format);
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}
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static void
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gimp_curves_tool_update_channel (GimpCurvesTool *tool)
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{
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  GimpFilterTool       *filter_tool = GIMP_FILTER_TOOL (tool);
  GimpCurvesConfig     *config      = GIMP_CURVES_CONFIG (filter_tool->config);
  GimpCurve            *curve       = config->curve[config->channel];
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  GimpHistogramChannel  channel;
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  gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (tool->channel_menu),
                                 config->channel);
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  switch (config->channel)
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    {
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      guchar r[256];
      guchar g[256];
      guchar b[256];

    case GIMP_HISTOGRAM_VALUE:
    case GIMP_HISTOGRAM_ALPHA:
    case GIMP_HISTOGRAM_RGB:
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    case GIMP_HISTOGRAM_LUMINANCE:
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      gimp_curve_get_uchar (curve, sizeof (r), r);

      gimp_color_bar_set_buffers (GIMP_COLOR_BAR (tool->xrange),
                                  r, r, r);
      break;

    case GIMP_HISTOGRAM_RED:
    case GIMP_HISTOGRAM_GREEN:
    case GIMP_HISTOGRAM_BLUE:
      gimp_curve_get_uchar (config->curve[GIMP_HISTOGRAM_RED],
                            sizeof (r), r);
      gimp_curve_get_uchar (config->curve[GIMP_HISTOGRAM_GREEN],
                            sizeof (g), g);
      gimp_curve_get_uchar (config->curve[GIMP_HISTOGRAM_BLUE],
                            sizeof (b), b);

      gimp_color_bar_set_buffers (GIMP_COLOR_BAR (tool->xrange),
                                  r, g, b);
      break;
    }

  gimp_histogram_view_set_channel (GIMP_HISTOGRAM_VIEW (tool->graph),
                                   config->channel);
  gimp_curve_view_set_xpos (GIMP_CURVE_VIEW (tool->graph),
                            tool->picked_color[config->channel]);

  gimp_color_bar_set_channel (GIMP_COLOR_BAR (tool->yrange),
                              config->channel);
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  gimp_curve_view_remove_all_backgrounds (GIMP_CURVE_VIEW (tool->graph));
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  for (channel = GIMP_HISTOGRAM_VALUE;
       channel <= GIMP_HISTOGRAM_ALPHA;
       channel++)
    {
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      GimpRGB  curve_color;
      gboolean has_color;

      has_color = curves_get_channel_color (tool->graph, channel, &curve_color);

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      if (channel == config->channel)
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        {
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          gimp_curve_view_set_curve (GIMP_CURVE_VIEW (tool->graph), curve,
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                                     has_color ? &curve_color : NULL);
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        }
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      else
        {
          gimp_curve_view_add_background (GIMP_CURVE_VIEW (tool->graph),
                                          config->curve[channel],
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                                          has_color ? &curve_color : NULL);
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        }
    }
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  gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (tool->curve_type),
                                 curve->curve_type);
}
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static void
curves_channel_callback (GtkWidget      *widget,
                         GimpCurvesTool *tool)
{
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  GimpFilterTool   *filter_tool = GIMP_FILTER_TOOL (tool);
  GimpCurvesConfig *config      = GIMP_CURVES_CONFIG (filter_tool->config);
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  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);
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    }
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}

static void
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curves_channel_reset_callback (GtkWidget      *widget,
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                               GimpCurvesTool *tool)
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{
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  GimpFilterTool   *filter_tool = GIMP_FILTER_TOOL (tool);
  GimpCurvesConfig *config      = GIMP_CURVES_CONFIG (filter_tool->config);
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  gimp_curve_reset (config->curve[config->channel], FALSE);
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}

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static gboolean
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curves_menu_sensitivity (gint      value,
                         gpointer  data)
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{
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  GimpDrawable         *drawable = GIMP_FILTER_TOOL (data)->drawable;
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  GimpHistogramChannel  channel  = value;
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  if (!drawable)
    return FALSE;

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  switch (channel)
    {
    case GIMP_HISTOGRAM_VALUE:
      return TRUE;
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    case GIMP_HISTOGRAM_RED:
    case GIMP_HISTOGRAM_GREEN:
    case GIMP_HISTOGRAM_BLUE:
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      return gimp_drawable_is_rgb (drawable);
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    case GIMP_HISTOGRAM_ALPHA:
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      return gimp_drawable_has_alpha (drawable);
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    case GIMP_HISTOGRAM_RGB:
      return FALSE;
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    case GIMP_HISTOGRAM_LUMINANCE:
      return FALSE;
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    }
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  return FALSE;
}

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static void
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curves_curve_type_callback (GtkWidget      *widget,
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                            GimpCurvesTool *tool)
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{
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  gint value;
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  if (gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (widget), &value))
    {
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      GimpFilterTool   *filter_tool = GIMP_FILTER_TOOL (tool);
      GimpCurvesConfig *config      = GIMP_CURVES_CONFIG (filter_tool->config);
      GimpCurveType     curve_type  = value;
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      if (config->curve[config->channel]->curve_type != curve_type)
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        gimp_curve_set_curve_type (config->curve[config->channel], curve_type);
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    }
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}
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