[gnome-photos/wip/rishi/edit-mode: 23/28] Add PhotosToolColors

[Debarshi Ray <debarshir src gnome org>]

commit c51c813a65abb5f67de2b3fb7b3b1df17d0b3704
Author: Debarshi Ray <debarshir gnome org>
Date:   Tue Nov 10 10:50:32 2015 +0100

    Add PhotosToolColors

 src/Makefile.am          |    2 +
 src/photos-tool-colors.c |  247 ++++++++++++++++++++++++++++++++++++++++++++++
 src/photos-tool-colors.h |   45 +++++++++
 src/photos-utils.c       |    2 +
 4 files changed, 296 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 4e08294..fe70d41 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -190,6 +190,8 @@ gnome_photos_SOURCES = \
        photos-spinner-box.h \
        photos-tool.c \
        photos-tool.h \
+       photos-tool-colors.c \
+       photos-tool-colors.h \
        photos-tool-crop.c \
        photos-tool-crop.h \
        photos-tool-enhance.c \
diff --git a/src/photos-tool-colors.c b/src/photos-tool-colors.c
new file mode 100644
index 0000000..491c763
--- /dev/null
+++ b/src/photos-tool-colors.c
@@ -0,0 +1,247 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2015 Red Hat, Inc.
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+
+#include "config.h"
+
+#include <gio/gio.h>
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <gtk/gtk.h>
+
+#include "photos-icons.h"
+#include "photos-tool.h"
+#include "photos-tool-colors.h"
+#include "photos-utils.h"
+
+
+struct _PhotosToolColors
+{
+  PhotosTool parent_instance;
+  GAction *brightness_contrast;
+  GtkWidget *box;
+  GtkWidget *brightness_scale;
+  GtkWidget *contrast_scale;
+  guint brightness_contrast_value_changed_id;
+};
+
+struct _PhotosToolColorsClass
+{
+  PhotosToolClass parent_class;
+};
+
+
+G_DEFINE_TYPE_WITH_CODE (PhotosToolColors, photos_tool_colors, PHOTOS_TYPE_TOOL,
+                         photos_utils_ensure_extension_points ();
+                         g_io_extension_point_implement (PHOTOS_TOOL_EXTENSION_POINT_NAME,
+                                                         g_define_type_id,
+                                                         "colors",
+                                                         200));
+
+
+static const gdouble BRIGHTNESS_DEFAULT = 0.0;
+static const gdouble BRIGHTNESS_MAXIMUM = 1.0;
+static const gdouble BRIGHTNESS_MINIMUM = -1.0;
+static const gdouble BRIGHTNESS_STEP = 0.1;
+static const gdouble CONTRAST_DEFAULT = 1.0;
+static const gdouble CONTRAST_MAXIMUM = 2.0;
+static const gdouble CONTRAST_MINIMUM = 0.0;
+static const gdouble CONTRAST_STEP = 0.1;
+
+
+static gboolean
+photos_tool_colors_brightness_contrast_value_changed_timeout (gpointer user_data)
+{
+  PhotosToolColors *self = PHOTOS_TOOL_COLORS (user_data);
+  GVariantBuilder parameter;
+  GVariantType *parameter_type;
+  gdouble brightness;
+  gdouble contrast;
+
+  brightness = gtk_range_get_value (GTK_RANGE (self->brightness_scale));
+  contrast = gtk_range_get_value (GTK_RANGE (self->contrast_scale));
+
+  parameter_type = g_variant_type_new ("a{sd}");
+  g_variant_builder_init (&parameter, parameter_type);
+  g_variant_builder_add (&parameter, "{sd}", "brightness", brightness);
+  g_variant_builder_add (&parameter, "{sd}", "contrast", contrast);
+  g_action_activate (self->brightness_contrast, g_variant_builder_end (&parameter));
+
+  self->brightness_contrast_value_changed_id = 0;
+  return G_SOURCE_REMOVE;
+}
+
+
+static void
+photos_tool_colors_brightness_contrast_value_changed (PhotosToolColors *self)
+{
+  if (self->brightness_contrast_value_changed_id != 0)
+    g_source_remove (self->brightness_contrast_value_changed_id);
+
+  self->brightness_contrast_value_changed_id
+    = g_timeout_add (150,
+                     photos_tool_colors_brightness_contrast_value_changed_timeout,
+                     self);
+}
+
+
+static void
+photos_tool_colors_activate (PhotosTool *tool, PhotosBaseItem *item, GeglGtkView *view)
+{
+  PhotosToolColors *self = PHOTOS_TOOL_COLORS (tool);
+  gdouble brightness;
+  gdouble contrast;
+
+  if (!photos_base_item_operation_get (item,
+                                       "gegl:brightness-contrast",
+                                       "brightness", &brightness,
+                                       "contrast", &contrast,
+                                       NULL))
+    {
+      brightness = BRIGHTNESS_DEFAULT;
+      contrast = CONTRAST_DEFAULT;
+    }
+
+  brightness = CLAMP (brightness, BRIGHTNESS_MINIMUM, BRIGHTNESS_MAXIMUM);
+  contrast = CLAMP (contrast, CONTRAST_MINIMUM, CONTRAST_MAXIMUM);
+
+  g_signal_handlers_block_by_func (self->brightness_scale,
+                                   photos_tool_colors_brightness_contrast_value_changed,
+                                   self);
+  g_signal_handlers_block_by_func (self->contrast_scale,
+                                   photos_tool_colors_brightness_contrast_value_changed,
+                                   self);
+  gtk_range_set_value (GTK_RANGE (self->brightness_scale), brightness);
+  gtk_range_set_value (GTK_RANGE (self->contrast_scale), contrast);
+  g_signal_handlers_unblock_by_func (self->brightness_scale,
+                                     photos_tool_colors_brightness_contrast_value_changed,
+                                     self);
+  g_signal_handlers_unblock_by_func (self->contrast_scale,
+                                     photos_tool_colors_brightness_contrast_value_changed,
+                                     self);
+}
+
+
+static GtkWidget *
+photos_tool_colors_get_widget (PhotosTool *tool)
+{
+  PhotosToolColors *self = PHOTOS_TOOL_COLORS (tool);
+  return self->box;
+}
+
+
+static void
+photos_tool_colors_dispose (GObject *object)
+{
+  PhotosToolColors *self = PHOTOS_TOOL_COLORS (object);
+
+  g_clear_object (&self->box);
+
+  G_OBJECT_CLASS (photos_tool_colors_parent_class)->dispose (object);
+}
+
+
+static void
+photos_tool_colors_finalize (GObject *object)
+{
+  PhotosToolColors *self = PHOTOS_TOOL_COLORS (object);
+
+  if (self->brightness_contrast_value_changed_id != 0)
+    g_source_remove (self->brightness_contrast_value_changed_id);
+
+  G_OBJECT_CLASS (photos_tool_colors_parent_class)->dispose (object);
+}
+
+
+static void
+photos_tool_colors_init (PhotosToolColors *self)
+{
+  GApplication *app;
+  GtkStyleContext *context;
+  GtkWidget *box;
+  GtkWidget *label;
+
+  app = g_application_get_default ();
+  self->brightness_contrast = g_action_map_lookup_action (G_ACTION_MAP (app), "brightness-contrast-current");
+
+  /* We really need a GtkBox here. A GtkGrid won't work because it
+   * doesn't expand the children to fill the full width of the
+   * palette.
+   */
+  self->box = g_object_ref_sink (gtk_box_new (GTK_ORIENTATION_VERTICAL, 12));
+
+  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 3);
+  gtk_container_add (GTK_CONTAINER (self->box), box);
+
+  label = gtk_label_new (_("Brightness"));
+  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->brightness_scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL,
+                                                     BRIGHTNESS_MINIMUM,
+                                                     BRIGHTNESS_MAXIMUM,
+                                                     BRIGHTNESS_STEP);
+  gtk_scale_add_mark (GTK_SCALE (self->brightness_scale), BRIGHTNESS_DEFAULT, GTK_POS_BOTTOM, NULL);
+  gtk_scale_set_draw_value (GTK_SCALE (self->brightness_scale), FALSE);
+  gtk_container_add (GTK_CONTAINER (box), self->brightness_scale);
+  g_signal_connect_swapped (self->brightness_scale,
+                            "value-changed",
+                            G_CALLBACK (photos_tool_colors_brightness_contrast_value_changed),
+                            self);
+
+  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 3);
+  gtk_container_add (GTK_CONTAINER (self->box), box);
+
+  label = gtk_label_new (_("Contrast"));
+  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->contrast_scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL,
+                                                   CONTRAST_MINIMUM,
+                                                   CONTRAST_MAXIMUM,
+                                                   CONTRAST_STEP);
+  gtk_scale_add_mark (GTK_SCALE (self->contrast_scale), CONTRAST_DEFAULT, GTK_POS_BOTTOM, NULL);
+  gtk_scale_set_draw_value (GTK_SCALE (self->contrast_scale), FALSE);
+  gtk_container_add (GTK_CONTAINER (box), self->contrast_scale);
+  g_signal_connect_swapped (self->contrast_scale,
+                            "value-changed",
+                            G_CALLBACK (photos_tool_colors_brightness_contrast_value_changed),
+                            self);
+}
+
+
+static void
+photos_tool_colors_class_init (PhotosToolColorsClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+  PhotosToolClass *tool_class = PHOTOS_TOOL_CLASS (class);
+
+  tool_class->icon_name = PHOTOS_ICON_IMAGE_SHARPEN_SYMBOLIC;
+  tool_class->name = _("Colors");
+
+  object_class->dispose = photos_tool_colors_dispose;
+  object_class->finalize = photos_tool_colors_finalize;
+  tool_class->activate = photos_tool_colors_activate;
+  tool_class->get_widget = photos_tool_colors_get_widget;
+}
diff --git a/src/photos-tool-colors.h b/src/photos-tool-colors.h
new file mode 100644
index 0000000..a3a7108
--- /dev/null
+++ b/src/photos-tool-colors.h
@@ -0,0 +1,45 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2015 Red Hat, Inc.
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef PHOTOS_TOOL_COLORS_H
+#define PHOTOS_TOOL_COLORS_H
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_TOOL_COLORS (photos_tool_colors_get_type ())
+
+#define PHOTOS_TOOL_COLORS(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+   PHOTOS_TYPE_TOOL_COLORS, PhotosToolColors))
+
+#define PHOTOS_IS_TOOL_COLORS(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+   PHOTOS_TYPE_TOOL_COLORS))
+
+typedef struct _PhotosToolColors      PhotosToolColors;
+typedef struct _PhotosToolColorsClass PhotosToolColorsClass;
+
+GType               photos_tool_colors_get_type           (void) G_GNUC_CONST;
+
+G_END_DECLS
+
+#endif /* PHOTOS_TOOL_COLORS_H */
diff --git a/src/photos-utils.c b/src/photos-utils.c
index 2cfdec2..8b3d23e 100644
--- a/src/photos-utils.c
+++ b/src/photos-utils.c
@@ -47,6 +47,7 @@
 #include "photos-query.h"
 #include "photos-source.h"
 #include "photos-tool.h"
+#include "photos-tool-colors.h"
 #include "photos-tool-crop.h"
 #include "photos-tool-enhance.h"
 #include "photos-tool-filters.h"
@@ -590,6 +591,7 @@ photos_utils_ensure_builtins (void)
       g_type_ensure (PHOTOS_TYPE_OPERATION_INSTA_CURVE);
       g_type_ensure (PHOTOS_TYPE_OPERATION_INSTA_FILTER);
 
+      g_type_ensure (PHOTOS_TYPE_TOOL_COLORS);
       g_type_ensure (PHOTOS_TYPE_TOOL_CROP);
       g_type_ensure (PHOTOS_TYPE_TOOL_ENHANCE);
       g_type_ensure (PHOTOS_TYPE_TOOL_FILTERS);