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/*
* Copyright (C) 2011-2012 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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 <http://www.gnu.org/licenses/>.
*
* Authored by: Gordon Allott <gord.alott@canonical.com>
*/
#include "BGHash.h"
#include <gdk/gdkx.h>
#include <NuxCore/Logger.h>
#include "unity-shared/WindowManager.h"
#ifndef XA_STRING
#define XA_STRING ((Atom) 31)
#endif
DECLARE_LOGGER(logger, "unity.bghash");
namespace unity
{
namespace
{
Atom COLORS_ATOM = 0;
const unsigned TRANSITION_DURATION = 500;
}
BGHash::BGHash()
: transition_animator_(TRANSITION_DURATION)
, override_color_(nux::color::Transparent)
{
COLORS_ATOM = gdk_x11_get_xatom_by_name("_GNOME_BACKGROUND_REPRESENTATIVE_COLORS");
transition_animator_.updated.connect(sigc::mem_fun(this, &BGHash::OnTransitionUpdated));
WindowManager::Default().average_color = unity::colors::Aubergine;
RefreshColor();
}
uint64_t BGHash::ColorAtomId() const
{
return COLORS_ATOM;
}
void BGHash::OverrideColor(nux::Color const& color)
{
override_color_ = color;
RefreshColor();
}
void BGHash::RefreshColor()
{
if (override_color_.alpha > 0.0f)
{
TransitionToNewColor(override_color_);
return;
}
// XXX: move this part to PluginAdapter
Atom real_type;
gint result;
gint real_format;
gulong items_read;
gulong items_left;
gchar* colors;
Display* display;
GdkRGBA color_gdk;
colors = nullptr;
display = gdk_x11_display_get_xdisplay(gdk_display_get_default());
gdk_error_trap_push();
result = XGetWindowProperty (display,
GDK_ROOT_WINDOW(),
COLORS_ATOM,
0L,
G_MAXLONG,
False,
XA_STRING,
&real_type,
&real_format,
&items_read,
&items_left,
(guchar **) &colors);
gdk_flush ();
gdk_error_trap_pop_ignored ();
if (result == Success && items_read)
{
gdk_rgba_parse(&color_gdk, colors);
nux::Color new_color(color_gdk.red, color_gdk.green, color_gdk.blue, 1.0f);
TransitionToNewColor(MatchColor(new_color));
}
XFree(colors);
}
void BGHash::TransitionToNewColor(nux::color::Color const& new_color)
{
auto const& current_color = WindowManager::Default().average_color();
LOG_DEBUG(logger) << "transitioning from: " << current_color.red << " to " << new_color.red;
transition_animator_.Stop();
transition_animator_.SetStartValue(current_color).SetFinishValue(new_color).Start();
}
void BGHash::OnTransitionUpdated(nux::Color const& new_color)
{
WindowManager::Default().average_color = new_color;
}
nux::Color BGHash::MatchColor(nux::Color const& base_color) const
{
nux::Color chosen_color;
nux::color::HueSaturationValue base_hsv(base_color);
if (base_hsv.saturation < 0.08)
{
// grayscale image
LOG_DEBUG (logger) << "got a grayscale image";
chosen_color = nux::Color (46 , 52 , 54 );
chosen_color.alpha = 0.72f;
}
else
{
std::vector<nux::Color> colors = {
nux::Color(0x540e44), nux::Color(0x6e0b2a), nux::Color(0x841617),
nux::Color(0x84371b), nux::Color(0x864d20), nux::Color(0x857f31),
nux::Color(0x1d6331), nux::Color(0x11582e), nux::Color(0x0e5955),
nux::Color(0x192b59), nux::Color(0x1b134c), nux::Color(0x2c0d46),
};
float closest_diff = 200.0f;
LOG_DEBUG (logger) << "got a colour image";
// full colour image
for (auto const& color : colors)
{
nux::color::HueSaturationValue comparison_hsv(color);
float color_diff = fabs(base_hsv.hue - comparison_hsv.hue);
if (color_diff < closest_diff)
{
chosen_color = color;
closest_diff = color_diff;
}
}
nux::color::HueSaturationValue hsv_color(chosen_color);
hsv_color.saturation = std::min(base_hsv.saturation, hsv_color.saturation);
hsv_color.saturation *= (2.0f - hsv_color.saturation);
hsv_color.value = std::min({base_hsv.value, hsv_color.value, 0.26f});
chosen_color = nux::Color(nux::color::RedGreenBlue(hsv_color));
chosen_color.alpha = 0.72f;
}
LOG_DEBUG(logger) << "eventually chose "
<< chosen_color.red << ", "
<< chosen_color.green << ", "
<< chosen_color.blue;
return chosen_color;
}
nux::Color BGHash::CurrentColor() const
{
return WindowManager::Default().average_color();
}
}
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