1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/*
Copyright (c) 2011 by Simon Schneegans
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/>.
*/
namespace GnomePie {
/////////////////////////////////////////////////////////////////////////
/// A class representing string, rendered on an Image.
/////////////////////////////////////////////////////////////////////////
public class RenderedText : Image {
/////////////////////////////////////////////////////////////////////
/// A cache which stores images. It is cleared when the theme of
/// Gnome-Pie changes.
/// The key is in form <string>@<width>x<height>:<font>.
/////////////////////////////////////////////////////////////////////
private static Gee.HashMap<string, Cairo.ImageSurface?> cache { private get; private set; }
/////////////////////////////////////////////////////////////////////
/// Initializes the cache.
/////////////////////////////////////////////////////////////////////
public static void init() {
clear_cache();
Config.global.notify["theme"].connect(() => {
clear_cache();
});
}
/////////////////////////////////////////////////////////////////////
/// Clears the cache.
/////////////////////////////////////////////////////////////////////
static void clear_cache() {
cache = new Gee.HashMap<string, Cairo.ImageSurface?>();
}
/////////////////////////////////////////////////////////////////////
/// C'tor, creates a new image representation of a string.
/////////////////////////////////////////////////////////////////////
public RenderedText(string text, int width, int height, string font,
Color color, double scale) {
var cached = this.cache.get("%s@%ux%u@%f:%s:%f:%f:%f:%f".printf(text, width, height, scale, font,
color.r, color.g, color.b, color.a));
if (cached == null) {
this.render_text(text, width, height, font, color, scale);
this.cache.set("%s@%ux%u@%f:%s:%f:%f:%f:%f".printf(text, width, height, scale, font,
color.r, color.g, color.b, color.a), this.surface);
} else {
this.surface = cached;
}
}
/////////////////////////////////////////////////////////////////////
/// C'tor, creates a new image representation of a string. This
/// string may contain markup information.
/////////////////////////////////////////////////////////////////////
public RenderedText.with_markup(string text, int width, int height, string font,
Color color, double scale) {
var cached = this.cache.get("%s@%ux%u@%f:%s:%f:%f:%f:%f".printf(text, width, height, scale, font,
color.r, color.g, color.b, color.a));
if (cached == null) {
this.render_markup(text, width, height, font, color, scale);
this.cache.set("%s@%ux%u@%f:%s:%f:%f:%f:%f".printf(text, width, height, scale, font,
color.r, color.g, color.b, color.a), this.surface);
} else {
this.surface = cached;
}
}
/////////////////////////////////////////////////////////////////////
/// Creates a new transparent image, with text written onto.
/////////////////////////////////////////////////////////////////////
public void render_text(string text, int width, int height, string font,
Color color, double scale) {
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
var ctx = this.context();
// set the color
ctx.set_source_rgb(color.r, color.g, color.g);
var layout = Pango.cairo_create_layout(ctx);
layout.set_width(Pango.units_from_double(width));
var font_description = Pango.FontDescription.from_string(font);
font_description.set_size((int)(font_description.get_size() * scale));
layout.set_font_description(font_description);
layout.set_text(text, -1);
// add newlines at the end of each line, in order to allow ellipsizing
string broken_string = "";
foreach (var line in layout.get_lines()) {
broken_string = broken_string.concat(text.substring(line.start_index, line.length), "\n");
}
layout.set_text(broken_string, broken_string.length-1);
layout.set_ellipsize(Pango.EllipsizeMode.END);
layout.set_alignment(Pango.Alignment.CENTER);
Pango.Rectangle extents;
layout.get_pixel_extents(null, out extents);
ctx.move_to(0, (int)(0.5*(height - extents.height)));
Pango.cairo_update_layout(ctx, layout);
Pango.cairo_show_layout(ctx, layout);
}
/////////////////////////////////////////////////////////////////////
/// Creates a new transparent image, with text written onto.
/////////////////////////////////////////////////////////////////////
public void render_markup(string text, int width, int height, string font,
Color color, double scale) {
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
var ctx = this.context();
// set the color
ctx.set_source_rgb(color.r, color.g, color.g);
var layout = Pango.cairo_create_layout(ctx);
layout.set_width(Pango.units_from_double(width));
var font_description = Pango.FontDescription.from_string(font);
font_description.set_size((int)(font_description.get_size() * scale));
layout.set_font_description(font_description);
layout.set_markup(text, -1);
layout.set_ellipsize(Pango.EllipsizeMode.END);
layout.set_alignment(Pango.Alignment.CENTER);
Pango.Rectangle extents;
layout.get_pixel_extents(null, out extents);
ctx.move_to(0, (int)(0.5*(height - extents.height)));
Pango.cairo_update_layout(ctx, layout);
Pango.cairo_show_layout(ctx, layout);
}
}
}
|
