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f74d8fdad5
* 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
/*
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* Copyright 2019 elementary, Inc. (https://elementary.io)
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* Copyright 2011-2013 Maxwell Barvian <maxwell@elementaryos.org>
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* Copyright Robert Dyer
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* SPDX-License-Identifier: LGPL-3.0-or-later
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*/
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/**
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* A utility class for frequently-performed drawing operations.
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*/
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public class Gala.Drawing.Utilities : GLib.Object {
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/**
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* Adds a closed sub-path rounded rectangle of the given size and border radius to the current path
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* at position (x, y) in user-space coordinates.
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*
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* @param cr a {@link Cairo.Context}
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* @param x the X coordinate of the top left corner of the rounded rectangle
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* @param y the Y coordinate to the top left corner of the rounded rectangle
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* @param width the width of the rounded rectangle
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* @param height the height of the rounded rectangle
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* @param radius the border radius of the rounded rectangle
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*/
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public static void cairo_rounded_rectangle (
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Cairo.Context cr,
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double x,
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double y,
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double width,
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double height,
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double radius
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) {
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cr.move_to (x + radius, y);
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cr.arc (x + width - radius, y + radius, radius, Math.PI * 1.5, Math.PI * 2);
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cr.arc (x + width - radius, y + height - radius, radius, 0, Math.PI * 0.5);
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cr.arc (x + radius, y + height - radius, radius, Math.PI * 0.5, Math.PI);
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cr.arc (x + radius, y + radius, radius, Math.PI, Math.PI * 1.5);
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cr.close_path ();
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}
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/**
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* Averages the colors in the {@link Gdk.Pixbuf} and returns it.
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*
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* @param source the {@link Gdk.Pixbuf}
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*
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* @return the {@link Gala.Drawing.Color} containing the averaged color
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*/
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public static Drawing.Color average_color (Gdk.Pixbuf source) {
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var r_total = 0.0;
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var g_total = 0.0;
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var b_total = 0.0;
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uint8* data_ptr = source.get_pixels ();
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double pixels = source.height * source.rowstride / source.n_channels;
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for (var i = 0; i < pixels; i++) {
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var r = data_ptr [0];
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var g = data_ptr [1];
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var b = data_ptr [2];
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var max = (uint8) double.max (r, double.max (g, b));
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var min = (uint8) double.min (r, double.min (g, b));
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double delta = max - min;
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var sat = delta == 0 ? 0.0 : delta / max;
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var score = 0.2 + 0.8 * sat;
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r_total += r * score;
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g_total += g * score;
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b_total += b * score;
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data_ptr += source.n_channels;
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}
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return new Drawing.Color (
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r_total / uint8.MAX / pixels,
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g_total / uint8.MAX / pixels,
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b_total / uint8.MAX / pixels,
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1
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).set_val (0.8).multiply_sat (1.15);
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}
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}
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