mirror of
https://github.com/elementary/gala.git
synced 2024-09-11 15:15:39 +03:00
* Drawing: Migrate functions removed from Granite 7 Some drawing utilities used by Gala were removed from Granite 7: https://github.com/elementary/granite/pull/603 Add them to Gala. * Drawing: Use drawings functions from Gala instead of Granite
82 lines
2.7 KiB
Vala
82 lines
2.7 KiB
Vala
/*
|
|
* Copyright 2019 elementary, Inc. (https://elementary.io)
|
|
* Copyright 2011-2013 Maxwell Barvian <maxwell@elementaryos.org>
|
|
* Copyright Robert Dyer
|
|
* SPDX-License-Identifier: LGPL-3.0-or-later
|
|
*/
|
|
|
|
/**
|
|
* A utility class for frequently-performed drawing operations.
|
|
*/
|
|
public class Gala.Drawing.Utilities : GLib.Object {
|
|
|
|
/**
|
|
* Adds a closed sub-path rounded rectangle of the given size and border radius to the current path
|
|
* at position (x, y) in user-space coordinates.
|
|
*
|
|
* @param cr a {@link Cairo.Context}
|
|
* @param x the X coordinate of the top left corner of the rounded rectangle
|
|
* @param y the Y coordinate to the top left corner of the rounded rectangle
|
|
* @param width the width of the rounded rectangle
|
|
* @param height the height of the rounded rectangle
|
|
* @param radius the border radius of the rounded rectangle
|
|
*/
|
|
public static void cairo_rounded_rectangle (
|
|
Cairo.Context cr,
|
|
double x,
|
|
double y,
|
|
double width,
|
|
double height,
|
|
double radius
|
|
) {
|
|
cr.move_to (x + radius, y);
|
|
cr.arc (x + width - radius, y + radius, radius, Math.PI * 1.5, Math.PI * 2);
|
|
cr.arc (x + width - radius, y + height - radius, radius, 0, Math.PI * 0.5);
|
|
cr.arc (x + radius, y + height - radius, radius, Math.PI * 0.5, Math.PI);
|
|
cr.arc (x + radius, y + radius, radius, Math.PI, Math.PI * 1.5);
|
|
cr.close_path ();
|
|
}
|
|
|
|
/**
|
|
* Averages the colors in the {@link Gdk.Pixbuf} and returns it.
|
|
*
|
|
* @param source the {@link Gdk.Pixbuf}
|
|
*
|
|
* @return the {@link Gala.Drawing.Color} containing the averaged color
|
|
*/
|
|
public static Drawing.Color average_color (Gdk.Pixbuf source) {
|
|
var r_total = 0.0;
|
|
var g_total = 0.0;
|
|
var b_total = 0.0;
|
|
|
|
uint8* data_ptr = source.get_pixels ();
|
|
double pixels = source.height * source.rowstride / source.n_channels;
|
|
|
|
for (var i = 0; i < pixels; i++) {
|
|
var r = data_ptr [0];
|
|
var g = data_ptr [1];
|
|
var b = data_ptr [2];
|
|
|
|
var max = (uint8) double.max (r, double.max (g, b));
|
|
var min = (uint8) double.min (r, double.min (g, b));
|
|
double delta = max - min;
|
|
|
|
var sat = delta == 0 ? 0.0 : delta / max;
|
|
var score = 0.2 + 0.8 * sat;
|
|
|
|
r_total += r * score;
|
|
g_total += g * score;
|
|
b_total += b * score;
|
|
|
|
data_ptr += source.n_channels;
|
|
}
|
|
|
|
return new Drawing.Color (
|
|
r_total / uint8.MAX / pixels,
|
|
g_total / uint8.MAX / pixels,
|
|
b_total / uint8.MAX / pixels,
|
|
1
|
|
).set_val (0.8).multiply_sat (1.15);
|
|
}
|
|
}
|