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
|
#
# this is an example of various ways to include inline image data in your
# gtk2-perl programs.
# -- muppet, 29 nov 03
#
use Gtk2 -init;
#
# This is the text of a regular XPM file, reformatted to be valid Perl syntax.
# Note in particular the use of single quotes instead of double quotes; this
# makes sure that Perl doesn't treat the embedded $ and @ characters as
# special.
#
my @question_xpm = (
'32 32 17 1',
' c None',
'. c #030303',
'+ c #1A1A1A',
'@ c #4A4A4A',
'# c #616161',
'$ c #939393',
'% c #AAAAAA',
'& c #D2D2D2',
'* c #DCDCDC',
'= c #E2E2E2',
'- c #E6E6E6',
'; c #EDEDED',
'> c #343434',
', c #AEAEAE',
'x c #7B7B7B',
') c #C5C5C5',
'! c #F3F3F3',
' ',
' ',
' ',
' )&&&&)), ',
' )=*=--=-=;*& ',
' )*-;;!;;!;;;** ',
' )=;!)x@>+>#)!;!* ',
' &*!;#.>x%%x..>&!!& ',
' =;!@.$!!;;!=+.+;;=& ',
' );!%..;!;--;!$..x!;& ',
' *;;#..&!-&*;!&..>!;& ',
' &=;#..x!=&*;!&..>!;& ',
' )*;*@>&;&)=;!$..@!;& ',
' &*;;;;=&=;!!+..,!;* ',
' &--***=;!*@..#!;= ',
' )&)&=;!$..+x!;=& ',
' %&;!#.@%;!!=& ',
' &&;$.x!!;;-* ',
' &-!#.!!;=&) ',
' )-!@@;;*) ',
' )*;x$;-) ',
' &;!!!;;* ',
' &*!&@@);=& ',
' *=;@..@;=) ',
' *-;@..>!;* ',
' )-;)>>&-*& ',
' )=!!;;=) ',
' &=-;=) ',
' )**) ',
' ',
' ',
' ');
$pixbuf_from_xpm_data = Gtk2::Gdk::Pixbuf->new_from_xpm_data (@question_xpm);
#
# here we create a Pixbuf from raw rgba image data created on the fly.
# beware that this isn't the most efficient thing to do; if you have
# heavy bit-banging to do, you may be more interested in writing some
# xs code to get direct access to the pixel data in C.
#
my ($width, $height) = (64, 64);
my $data = pack "C*", map { ($_, $_/2, 64, $_) } map { ($_) x $width } (0..($height-1));
$pixbuf_from_raw_data = Gtk2::Gdk::Pixbuf->new_from_data
($data, # the data. this will be copied.
'rgb', # only currently supported colorspace
1, # true, because we do have alpha channel data
8, # gdk-pixbuf currently allows only 8-bit samples
$width, # width in pixels
$height, # height in pixels
$width * 4); # rowstride -- we have RGBA data, so it's four
# bytes per pixel.
#
# Gtk+ ships with a utility program called gdk-pixbuf-csource, which turns
# any image understood by gdk-pixbuf into a C data structure that can be
# parsed by gdk_pixbuf_new_from_inline(). here's an example of that output:
#
#----
#/* GdkPixbuf RGBA C-Source image dump */
#
#static const guint8 my_pixbuf[] =
#{ ""
# /* Pixbuf magic (0x47646b50) */
# "GdkP"
# /* length: header (24) + pixel_data (64) */
# "\0\0\0X"
# /* pixdata_type (0x1010002) */
# "\1\1\0\2"
# /* rowstride (16) */
# "\0\0\0\20"
# /* width (4) */
# "\0\0\0\4"
# /* height (4) */
# "\0\0\0\4"
# /* pixel_data: */
# "\377\0\0\377\377\0\0\377\0\0\0\0\0\0\377\377\377\0\0\377\0\0\0\0\0\0"
# "\377\377\0\0\377\377\0\0\0\0\0\0\377\377\0\0\377\377\377\0\0\377\0\0"
# "\377\377\0\0\377\377\377\0\0\377\377\0\0\377"};
#----
#
# obviously, this C syntax is not valid Perl. you can mangle that into Perl
# code and create the proper binary string using pack, as shown below, but
# in my experience, it's more trouble than it's worth. Since the data is in
# a Perl scalar which will be garbage-collected, the image data must always
# be copied, so you lose the ability to use static image data. Also, the
# direct output from that tool is not useful. [FIXME perhaps we should make
# a tool dedicated to gtk2-perl?]
#
my $my_pixbuf = pack "a4a4a4a4a4a4a64",
"GdkP", # Pixbuf magic (0x47646b50)
"\0\0\0X", # length: header (24) + pixel_data (64)
"\1\1\0\2", # pixdata_type (0x1010002)
"\0\0\0\20", # rowstride (16)
"\0\0\0\4", # width (4)
"\0\0\0\4", # height (4)
# pixel_data:
"\377\0\0\377\377\0\0\377\0\0\0\0\0\0\377\377\377\0\0\377\0\0\0\0\0\0"
."\377\377\0\0\377\377\0\0\0\0\0\0\377\377\0\0\377\377\377\0\0\377\0\0"
."\377\377\0\0\377\377\377\0\0\377\377\0\0\377";
$pixbuf_from_inline = Gtk2::Gdk::Pixbuf->new_from_inline ($my_pixbuf);
$dlg = Gtk2::Dialog->new;
$hbox = Gtk2::HBox->new (1, 6);
$dlg->vbox->add ($hbox);
$frame = Gtk2::Frame->new ('xpm data');
$frame->add (Gtk2::Image->new_from_pixbuf ($pixbuf_from_xpm_data));
$hbox->add ($frame);
$frame = Gtk2::Frame->new ('raw data');
$frame->add (Gtk2::Image->new_from_pixbuf ($pixbuf_from_raw_data));
$hbox->add ($frame);
$frame = Gtk2::Frame->new ('inline data');
$frame->add (Gtk2::Image->new_from_pixbuf ($pixbuf_from_inline));
$hbox->add ($frame);
$dlg->add_button ('gtk-close' => 'close');
$dlg->show_all;
$dlg->run;
|
