[gnome-photos/wip/rishi/shadhi: 3/4] tool-colors: Add gegl:shadows-highlights

[Debarshi Ray <debarshir src gnome org>]

commit fa6c11fc64b731a1a3f31366288c86f5f05d37cd
Author: Umang Jain <mailumangjain gmail com>
Date:   Wed Oct 25 18:12:37 2017 +0530

    tool-colors: Add gegl:shadows-highlights
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788201

 src/photos-tool-colors.c |  124 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 124 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-tool-colors.c b/src/photos-tool-colors.c
index 89c5af9..e0a50aa 100644
--- a/src/photos-tool-colors.c
+++ b/src/photos-tool-colors.c
@@ -1,6 +1,7 @@
 /*
  * Photos - access, organize and share your photos on GNOME
  * Copyright © 2015 – 2017 Red Hat, Inc.
+ * Copyright © 2017 Umang Jain
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -40,15 +41,19 @@ struct _PhotosToolColors
   GAction *blacks_exposure;
   GAction *brightness_contrast;
   GAction *saturation;
+  GAction *shadows_highlights;
   GtkWidget *blacks_scale;
   GtkWidget *brightness_scale;
   GtkWidget *contrast_scale;
   GtkWidget *exposure_scale;
   GtkWidget *grid;
+  GtkWidget *highlights_scale;
   GtkWidget *saturation_scale;
+  GtkWidget *shadows_scale;
   guint blacks_exposure_value_changed_id;
   guint brightness_contrast_value_changed_id;
   guint saturation_value_changed_id;
+  guint shadows_highlights_value_changed_id;
 };
 
 
@@ -76,10 +81,18 @@ static const gdouble EXPOSURE_DEFAULT = 0.0;
 static const gdouble EXPOSURE_MAXIMUM = 3.0;
 static const gdouble EXPOSURE_MINIMUM = -3.0;
 static const gdouble EXPOSURE_STEP = 0.3;
+static const gdouble HIGHLIGHTS_DEFAULT = -1.0;
+static const gdouble HIGHLIGHTS_MAXIMUM = -1.0;
+static const gdouble HIGHLIGHTS_MINIMUM = -16.0;
+static const gdouble HIGHLIGHTS_STEP = 0.5;
 static const gdouble SATURATION_DEFAULT = 1.0;
 static const gdouble SATURATION_MAXIMUM = 2.0;
 static const gdouble SATURATION_MINIMUM = 0.0;
 static const gdouble SATURATION_STEP = 0.1;
+static const gdouble SHADOWS_DEFAULT = 1.0;
+static const gdouble SHADOWS_MAXIMUM = 16.0;
+static const gdouble SHADOWS_MINIMUM = 1.0;
+static const gdouble SHADOWS_STEP = 0.5;
 
 
 static gboolean
@@ -142,6 +155,34 @@ photos_tool_colors_saturation_value_changed_timeout (gpointer user_data)
 }
 
 
+static gboolean
+photos_tool_colors_shadows_highlights_value_changed_timeout (gpointer user_data)
+{
+  PhotosToolColors *self = PHOTOS_TOOL_COLORS (user_data);
+  GVariantBuilder parameter;
+  GVariantType *parameter_type;
+  gdouble shadows;
+  gdouble shadows_real;
+  gdouble highlights;
+  gdouble highlights_real;
+
+  highlights = gtk_range_get_value (GTK_RANGE (self->highlights_scale));
+  shadows = gtk_range_get_value (GTK_RANGE (self->shadows_scale));
+
+  highlights_real = -25.0 * log2 (-highlights);
+  shadows_real = 25.0 * log2 (shadows);
+  parameter_type = g_variant_type_new ("a{sd}");
+  g_variant_builder_init (&parameter, parameter_type);
+  g_variant_builder_add (&parameter, "{sd}", "highlights", highlights_real);
+  g_variant_builder_add (&parameter, "{sd}", "shadows", shadows_real);
+  g_action_activate (self->shadows_highlights, g_variant_builder_end (&parameter));
+
+  g_variant_type_free (parameter_type);
+  self->shadows_highlights_value_changed_id = 0;
+  return G_SOURCE_REMOVE;
+}
+
+
 static void
 photos_tool_colors_blacks_exposure_value_changed (PhotosToolColors *self)
 {
@@ -180,6 +221,19 @@ photos_tool_colors_saturation_value_changed (PhotosToolColors *self)
 
 
 static void
+photos_tool_colors_shadows_highlights_value_changed (PhotosToolColors *self)
+{
+  if (self->shadows_highlights_value_changed_id != 0)
+    g_source_remove (self->shadows_highlights_value_changed_id);
+
+  self->shadows_highlights_value_changed_id
+    = g_timeout_add (150,
+                     photos_tool_colors_shadows_highlights_value_changed_timeout,
+                     self);
+}
+
+
+static void
 photos_tool_colors_activate (PhotosTool *tool, PhotosBaseItem *item, PhotosImageView *view)
 {
   PhotosToolColors *self = PHOTOS_TOOL_COLORS (tool);
@@ -188,7 +242,11 @@ photos_tool_colors_activate (PhotosTool *tool, PhotosBaseItem *item, PhotosImage
   gdouble contrast;
   gdouble contrast_real;
   gdouble exposure;
+  gdouble highlights;
+  gdouble highlights_real;
   gdouble saturation;
+  gdouble shadows;
+  gdouble shadows_real;
 
   if (photos_base_item_operation_get (item,
                                       "gegl:brightness-contrast",
@@ -213,11 +271,28 @@ photos_tool_colors_activate (PhotosTool *tool, PhotosBaseItem *item, PhotosImage
   if (!photos_base_item_operation_get (item, "photos:saturation", "scale", &saturation, NULL))
     saturation = SATURATION_DEFAULT;
 
+  if (photos_base_item_operation_get (item,
+                                      "gegl:shadows-highlights",
+                                      "highlights", &highlights_real,
+                                      "shadows", &shadows_real,
+                                      NULL))
+    {
+      highlights = -1.0 * pow (2.0, highlights_real / -25.0);
+      shadows = pow (2.0, shadows_real / 25.0);
+    }
+  else
+    {
+      shadows = SHADOWS_DEFAULT;
+      highlights = HIGHLIGHTS_DEFAULT;
+    }
+
   blacks = CLAMP (blacks, BLACKS_MINIMUM, BLACKS_MAXIMUM);
   brightness = CLAMP (brightness, BRIGHTNESS_MINIMUM, BRIGHTNESS_MAXIMUM);
   contrast = CLAMP (contrast, CONTRAST_MINIMUM, CONTRAST_MAXIMUM);
   exposure = CLAMP (exposure, EXPOSURE_MINIMUM, EXPOSURE_MAXIMUM);
+  highlights = CLAMP (highlights, HIGHLIGHTS_MINIMUM, HIGHLIGHTS_MAXIMUM);
   saturation = CLAMP (saturation, SATURATION_MINIMUM, SATURATION_MAXIMUM);
+  shadows = CLAMP (shadows, SHADOWS_MINIMUM, SHADOWS_MAXIMUM);
 
   g_signal_handlers_block_by_func (self->blacks_scale, photos_tool_colors_blacks_exposure_value_changed, 
self);
   g_signal_handlers_block_by_func (self->brightness_scale,
@@ -227,12 +302,16 @@ photos_tool_colors_activate (PhotosTool *tool, PhotosBaseItem *item, PhotosImage
                                    photos_tool_colors_brightness_contrast_value_changed,
                                    self);
   g_signal_handlers_block_by_func (self->exposure_scale, photos_tool_colors_blacks_exposure_value_changed, 
self);
+  g_signal_handlers_block_by_func (self->highlights_scale, 
photos_tool_colors_shadows_highlights_value_changed, self);
   g_signal_handlers_block_by_func (self->saturation_scale, photos_tool_colors_saturation_value_changed, 
self);
+  g_signal_handlers_block_by_func (self->shadows_scale, photos_tool_colors_shadows_highlights_value_changed, 
self);
   gtk_range_set_value (GTK_RANGE (self->blacks_scale), blacks);
   gtk_range_set_value (GTK_RANGE (self->brightness_scale), brightness);
   gtk_range_set_value (GTK_RANGE (self->contrast_scale), contrast);
   gtk_range_set_value (GTK_RANGE (self->exposure_scale), exposure);
+  gtk_range_set_value (GTK_RANGE (self->highlights_scale), highlights);
   gtk_range_set_value (GTK_RANGE (self->saturation_scale), saturation);
+  gtk_range_set_value (GTK_RANGE (self->shadows_scale), shadows);
   g_signal_handlers_unblock_by_func (self->blacks_scale, photos_tool_colors_blacks_exposure_value_changed, 
self);
   g_signal_handlers_unblock_by_func (self->brightness_scale,
                                      photos_tool_colors_brightness_contrast_value_changed,
@@ -241,7 +320,9 @@ photos_tool_colors_activate (PhotosTool *tool, PhotosBaseItem *item, PhotosImage
                                      photos_tool_colors_brightness_contrast_value_changed,
                                      self);
   g_signal_handlers_unblock_by_func (self->exposure_scale, photos_tool_colors_blacks_exposure_value_changed, 
self);
+  g_signal_handlers_unblock_by_func (self->highlights_scale, 
photos_tool_colors_shadows_highlights_value_changed, self);
   g_signal_handlers_unblock_by_func (self->saturation_scale, photos_tool_colors_saturation_value_changed, 
self);
+  g_signal_handlers_unblock_by_func (self->shadows_scale, 
photos_tool_colors_shadows_highlights_value_changed, self);
 
   g_signal_emit_by_name (self, "activated");
 }
@@ -280,6 +361,9 @@ photos_tool_colors_finalize (GObject *object)
   if (self->saturation_value_changed_id != 0)
     g_source_remove (self->saturation_value_changed_id);
 
+  if (self->shadows_highlights_value_changed_id != 0)
+    g_source_remove (self->shadows_highlights_value_changed_id);
+
   G_OBJECT_CLASS (photos_tool_colors_parent_class)->dispose (object);
 }
 
@@ -296,6 +380,7 @@ photos_tool_colors_init (PhotosToolColors *self)
   self->blacks_exposure = g_action_map_lookup_action (G_ACTION_MAP (app), "blacks-exposure-current");
   self->brightness_contrast = g_action_map_lookup_action (G_ACTION_MAP (app), "brightness-contrast-current");
   self->saturation = g_action_map_lookup_action (G_ACTION_MAP (app), "saturation-current");
+  self->shadows_highlights = g_action_map_lookup_action (G_ACTION_MAP (app), "shadows-highlights-current");
 
   self->grid = g_object_ref_sink (gtk_grid_new ());
   gtk_orientable_set_orientation (GTK_ORIENTABLE (self->grid), GTK_ORIENTATION_VERTICAL);
@@ -407,6 +492,45 @@ photos_tool_colors_init (PhotosToolColors *self)
                             "value-changed",
                             G_CALLBACK (photos_tool_colors_saturation_value_changed),
                             self);
+
+  label = gtk_label_new (_("Shadows"));
+  gtk_widget_set_halign (label, GTK_ALIGN_START);
+  context = gtk_widget_get_style_context (label);
+  gtk_style_context_add_class (context, "dim-label");
+  gtk_container_add (GTK_CONTAINER (box), label);
+
+  self->shadows_scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL,
+                                                  SHADOWS_MINIMUM,
+                                                  SHADOWS_MAXIMUM,
+                                                  SHADOWS_STEP);
+  gtk_widget_set_hexpand (self->shadows_scale, TRUE);
+  gtk_scale_add_mark (GTK_SCALE (self->shadows_scale), SHADOWS_DEFAULT, GTK_POS_BOTTOM, NULL);
+  gtk_scale_set_draw_value (GTK_SCALE (self->shadows_scale), FALSE);
+  gtk_container_add (GTK_CONTAINER (box), self->shadows_scale);
+  g_signal_connect_swapped (self->shadows_scale,
+                            "value-changed",
+                            G_CALLBACK (photos_tool_colors_shadows_highlights_value_changed),
+                            self);
+
+  label = gtk_label_new (_("Highlights"));
+  gtk_widget_set_halign (label, GTK_ALIGN_START);
+  context = gtk_widget_get_style_context (label);
+  gtk_style_context_add_class (context, "dim-label");
+  gtk_container_add (GTK_CONTAINER (box), label);
+
+  self->highlights_scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL,
+                                                     HIGHLIGHTS_MINIMUM,
+                                                     HIGHLIGHTS_MAXIMUM,
+                                                     HIGHLIGHTS_STEP);
+  gtk_widget_set_hexpand (self->highlights_scale, TRUE);
+  gtk_scale_add_mark (GTK_SCALE (self->highlights_scale), SHADOWS_DEFAULT, GTK_POS_BOTTOM, NULL);
+  gtk_scale_set_draw_value (GTK_SCALE (self->highlights_scale), FALSE);
+  gtk_container_add (GTK_CONTAINER (box), self->highlights_scale);
+  g_signal_connect_swapped (self->highlights_scale,
+                            "value-changed",
+                            G_CALLBACK (photos_tool_colors_shadows_highlights_value_changed),
+                            self);
+
 }