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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
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 which loads image files. It can load image files in various
/// formats, including jpeg, png and svg.
/////////////////////////////////////////////////////////////////////////
public class Image : GLib.Object {
/////////////////////////////////////////////////////////////////////
/// The internally used surface.
/////////////////////////////////////////////////////////////////////
public Cairo.ImageSurface surface { public get; protected set; default=null; }
/////////////////////////////////////////////////////////////////////
/// Creates an empty Image.
/////////////////////////////////////////////////////////////////////
public Image.empty(int width, int height, Color? color = null) {
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
if (color != null) {
var ctx = this.context();
ctx.set_source_rgb(color.r, color.g, color.b);
ctx.paint();
}
}
/////////////////////////////////////////////////////////////////////
/// Creates an image from the the given filename.
/////////////////////////////////////////////////////////////////////
public Image.from_file(string filename) {
this.load_file(filename);
}
/////////////////////////////////////////////////////////////////////
/// Creates an image from the the given filename at a given size.
/////////////////////////////////////////////////////////////////////
public Image.from_file_at_size(string filename, int width, int height) {
this.load_file_at_size(filename, width, height);
}
/////////////////////////////////////////////////////////////////////
/// Creates an image from the the given Gdk.Pixbuf.
/////////////////////////////////////////////////////////////////////
public Image.from_pixbuf(Gdk.Pixbuf pixbuf) {
if (pixbuf != null) this.load_pixbuf(pixbuf);
else this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 1, 1);
}
/////////////////////////////////////////////////////////////////////
/// Captures a part of the screen.
/////////////////////////////////////////////////////////////////////
public Image.capture_screen(int posx, int posy, int width, int height, bool hide_pies = true) {
Gdk.Window root = Gdk.get_default_root_window();
#if HAVE_GTK_3
Gdk.Pixbuf pixbuf = Gdk.pixbuf_get_from_window(root, posx, posy, width, height);
#else
Gdk.Pixbuf pixbuf = Gdk.pixbuf_get_from_drawable(null, root, null, posx, posy, 0, 0, width, height);
#endif
this.load_pixbuf(pixbuf);
if (hide_pies) {
// check for opened pies
foreach (var window in PieManager.opened_windows) {
if (window.background != null) {
int x=0, y=0, dx=0, dy=0;
window.get_position(out x, out y);
window.get_size(out dx, out dy);
var ctx = this.context();
ctx.translate((int)(x-posx + (dx+3)/2), (int)(y-posy + (dy+3)/2));
window.background.paint_on(ctx);
}
}
}
}
/////////////////////////////////////////////////////////////////////
/// Loads an image from the the given filename.
/////////////////////////////////////////////////////////////////////
public void load_file(string filename) {
try {
var pixbuf = new Gdk.Pixbuf.from_file(filename);
if (pixbuf != null) {
this.load_pixbuf(pixbuf);
} else {
warning("Failed to load " + filename + "!");
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 1, 1);
}
} catch (GLib.Error e) {
message("Error loading image file: %s", e.message);
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 1, 1);
}
}
/////////////////////////////////////////////////////////////////////
/// Loads an image from the the given filename at a given size.
/////////////////////////////////////////////////////////////////////
public void load_file_at_size(string filename, int width, int height) {
try {
var pixbuf = new Gdk.Pixbuf.from_file_at_size(filename, width, height);
if (pixbuf != null) {
this.load_pixbuf(pixbuf);
} else {
warning("Failed to load " + filename + "!");
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
}
} catch (GLib.Error e) {
message("Error loading image file: %s", e.message);
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
}
}
/////////////////////////////////////////////////////////////////////
/// Loads an image from the the given Gdk.Pixbuf.
/////////////////////////////////////////////////////////////////////
public void load_pixbuf(Gdk.Pixbuf pixbuf) {
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, pixbuf.width, pixbuf.height);
var ctx = this.context();
Gdk.cairo_set_source_pixbuf(ctx, pixbuf, 1.0, 1.0);
ctx.paint();
}
/////////////////////////////////////////////////////////////////////
/// Paints the image onto the given Cairo.Context
/////////////////////////////////////////////////////////////////////
public void paint_on(Cairo.Context ctx, double alpha = 1.0) {
ctx.set_source_surface(this.surface, (int)(-0.5*this.width()-1), (int)(-0.5*this.height()-1));
if (alpha >= 1.0) ctx.paint();
else ctx.paint_with_alpha(alpha);
}
/////////////////////////////////////////////////////////////////////
/// Converts the image to a Gdk.Pixbuf.
/////////////////////////////////////////////////////////////////////
public Gdk.Pixbuf to_pixbuf() {
if (this.surface == null || this.surface.get_data().length <= 0)
return new Gdk.Pixbuf(Gdk.Colorspace.RGB, true, 8, 1, 1);
var pixbuf = new Gdk.Pixbuf.from_data(this.surface.get_data(), Gdk.Colorspace.RGB, true, 8,
width(), height(), this.surface.get_stride(), null);
pixbuf = pixbuf.copy();
// funny stuff here --- need to swap Red end Blue because Cairo
// and Gdk are different...
uint8* p = pixbuf.pixels;
for (int i=0; i<width()*height()*4-4; i+=4) {
var tmp = *(p + i);
*(p + i) = *(p + i + 2);
*(p + i + 2) = tmp;
}
return pixbuf;
}
/////////////////////////////////////////////////////////////////////
/// Returns a Cairo.Context for the Image.
/////////////////////////////////////////////////////////////////////
public Cairo.Context context() {
return new Cairo.Context(this.surface);
}
/////////////////////////////////////////////////////////////////////
/// Returns the width of the image in pixels.
/////////////////////////////////////////////////////////////////////
public int width() {
if (this.surface != null)
return this.surface.get_width();
return 0;
}
/////////////////////////////////////////////////////////////////////
/// Returns the height of the image in pixels.
/////////////////////////////////////////////////////////////////////
public int height() {
if (this.surface != null)
return this.surface.get_height();
return 0;
}
}
}
|
