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DBus: cleanup (#2001)

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Leo 2024-07-28 19:21:23 +09:00 committed by GitHub
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1 changed files with 58 additions and 243 deletions
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201
src/DBus.vala
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@ -1,23 +1,12 @@
//
// Copyright (C) 2012 - 2014 Tom Beckmann, Jacob Parker
//
// 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 <http://www.gnu.org/licenses/>.
//
/*
* SPDX-License-Identifier: GPL-3.0-or-later
* SPDX-FileCopyrightText: 2024 elementary, Inc. (https://elementary.io)
* 2012-2014 Tom Beckmann
* 2012-2014 Jacob Parker
*/
namespace Gala {
[DBus (name="org.pantheon.gala")]
public class DBus {
[DBus (name="org.pantheon.gala")]
public class Gala.DBus {
private static DBus? instance;
private static WindowManagerGala wm;
@ -75,181 +64,7 @@ namespace Gala {
() => critical ("Could not acquire ScreenSaver bus") );
}
private DBus () {
if (wm.background_group != null)
((BackgroundContainer) wm.background_group).changed.connect (() => background_changed ());
else
assert_not_reached ();
}
public void perform_action (ActionType type) throws DBusError, IOError {
wm.perform_action (type);
}
private const double SATURATION_WEIGHT = 1.5;
private const double WEIGHT_THRESHOLD = 1.0;
private class DummyOffscreenEffect : Clutter.OffscreenEffect {
public signal void done_painting ();
public override void post_paint (Clutter.PaintNode node, Clutter.PaintContext context) {
base.post_paint (node, context);
done_painting ();
}
}
public struct ColorInformation {
double average_red;
double average_green;
double average_blue;
double mean;
double variance;
}
/**
* Emitted when the background change occurred and the transition ended.
* You can safely call get_optimal_panel_alpha then. It is not guaranteed
* that this signal will be emitted only once per group of changes as often
* done by GUIs. The change may not be visible to the user.
*/
public signal void background_changed ();
/**
* Attaches a dummy offscreen effect to the background at monitor to get its
* isolated color data. Then calculate the red, green and blue components of
* the average color in that area and the mean color value and variance. All
* variables are returned as a tuple in that order.
*
* @param monitor The monitor where the panel will be placed
* @param reference_x X coordinate of the rectangle used to gather color data
* relative to the monitor you picked. Values will be clamped
* to its dimensions
* @param reference_y Y coordinate
* @param reference_width Width of the rectangle
* @param reference_height Height of the rectangle
*/
public async ColorInformation get_background_color_information (int monitor,
int reference_x, int reference_y, int reference_width, int reference_height)
throws DBusError, IOError {
var background = wm.background_group.get_child_at_index (monitor);
if (background == null)
throw new DBusError.INVALID_ARGS ("Invalid monitor requested");
var effect = new DummyOffscreenEffect ();
background.add_effect (effect);
var tex_width = (int)background.width;
var tex_height = (int)background.height;
int x_start = reference_x;
int y_start = reference_y;
int width = int.min (tex_width - reference_x, reference_width);
int height = int.min (tex_height - reference_y, reference_height);
if (x_start > tex_width || x_start > tex_height || width <= 0 || height <= 0)
throw new DBusError.INVALID_ARGS ("Invalid rectangle specified");
double variance = 0, mean = 0,
r_total = 0, g_total = 0, b_total = 0;
ulong paint_signal_handler = 0;
paint_signal_handler = effect.done_painting.connect (() => {
SignalHandler.disconnect (effect, paint_signal_handler);
background.remove_effect (effect);
var texture = (Cogl.Texture)effect.get_texture ();
var pixels = new uint8[texture.get_width () * texture.get_height () * 4];
texture.get_data (Cogl.PixelFormat.BGRA_8888_PRE, 0, pixels);
int size = width * height;
double mean_squares = 0;
double pixel = 0;
double max, min, score, delta, score_total = 0,
r_total2 = 0, g_total2 = 0, b_total2 = 0;
// code to calculate weighted average color is copied from
// plank's lib/Drawing/DrawingService.vala average_color()
// http://bazaar.launchpad.net/~docky-core/plank/trunk/view/head:/lib/Drawing/DrawingService.vala
for (int y = y_start; y < height; y++) {
for (int x = x_start; x < width; x++) {
int i = y * width * 4 + x * 4;
uint8 r = pixels[i];
uint8 g = pixels[i + 1];
uint8 b = pixels[i + 2];
pixel = (0.3 * r + 0.6 * g + 0.11 * b) - 128f;
min = uint8.min (r, uint8.min (g, b));
max = uint8.max (r, uint8.max (g, b));
delta = max - min;
// prefer colored pixels over shades of grey
score = SATURATION_WEIGHT * (delta == 0 ? 0.0 : delta / max);
r_total += score * r;
g_total += score * g;
b_total += score * b;
score_total += score;
r_total += r;
g_total += g;
b_total += b;
mean += pixel;
mean_squares += pixel * pixel;
}
}
score_total /= size;
b_total /= size;
g_total /= size;
r_total /= size;
if (score_total > 0.0) {
b_total /= score_total;
g_total /= score_total;
r_total /= score_total;
}
b_total2 /= size * uint8.MAX;
g_total2 /= size * uint8.MAX;
r_total2 /= size * uint8.MAX;
// combine weighted and not weighted sum depending on the average "saturation"
// if saturation isn't reasonable enough
// s = 0.0 -> f = 0.0 ; s = WEIGHT_THRESHOLD -> f = 1.0
if (score_total <= WEIGHT_THRESHOLD) {
var f = 1.0 / WEIGHT_THRESHOLD * score_total;
var rf = 1.0 - f;
b_total = b_total * f + b_total2 * rf;
g_total = g_total * f + g_total2 * rf;
r_total = r_total * f + r_total2 * rf;
}
// there shouldn't be values larger then 1.0
var max_val = double.max (r_total, double.max (g_total, b_total));
if (max_val > 1.0) {
b_total /= max_val;
g_total /= max_val;
r_total /= max_val;
}
mean /= size;
mean_squares *= mean_squares / size;
variance = Math.sqrt (mean_squares - mean * mean) / (double) size;
get_background_color_information.callback ();
});
background.queue_redraw ();
yield;
return { r_total, g_total, b_total, mean, variance };
}
}
}