1 | #! perl |
1 | #! perl |
2 | |
2 | |
3 | #:META:X_RESOURCE:%.expr:string:background expression |
3 | #:META:X_RESOURCE:%.expr:string:background expression |
4 | #:META:X_RESOURCE:%.border.:boolean:respect the terminal border |
4 | #:META:X_RESOURCE:%.border:boolean:respect the terminal border |
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5 | #:META:X_RESOURCE:%.interval:seconds:minimum time between updates |
5 | |
6 | |
6 | #TODO: once, rootalign |
7 | =head1 NAME |
7 | |
8 | |
8 | =head1 background - manage terminal background |
9 | background - manage terminal background |
9 | |
10 | |
10 | =head2 SYNOPSIS |
11 | =head1 SYNOPSIS |
11 | |
12 | |
12 | urxvt --background-expr 'background expression' |
13 | urxvt --background-expr 'background expression' |
13 | --background-border |
14 | --background-border |
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15 | --background-interval seconds |
14 | |
16 | |
15 | =head2 DESCRIPTION |
17 | =head1 DESCRIPTION |
16 | |
18 | |
17 | This extension manages the terminal background by creating a picture that |
19 | This extension manages the terminal background by creating a picture that |
18 | is behind the text, replacing the normal background colour. |
20 | is behind the text, replacing the normal background colour. |
19 | |
21 | |
20 | It does so by evaluating a Perl expression that I<calculates> the image on |
22 | It does so by evaluating a Perl expression that I<calculates> the image on |
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30 | |
32 | |
31 | Or specified as a X resource: |
33 | Or specified as a X resource: |
32 | |
34 | |
33 | URxvt.background-expr: scale load "/path/to/mybg.png" |
35 | URxvt.background-expr: scale load "/path/to/mybg.png" |
34 | |
36 | |
35 | =head2 THEORY OF OPERATION |
37 | =head1 THEORY OF OPERATION |
36 | |
38 | |
37 | At startup, just before the window is mapped for the first time, the |
39 | At startup, just before the window is mapped for the first time, the |
38 | expression is evaluated and must yield an image. The image is then |
40 | expression is evaluated and must yield an image. The image is then |
39 | extended as necessary to cover the whole terminal window, and is set as a |
41 | extended as necessary to cover the whole terminal window, and is set as a |
40 | background pixmap. |
42 | background pixmap. |
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55 | |
57 | |
56 | For example, an expression such as C<scale load "$HOME/mybg.png"> scales the |
58 | For example, an expression such as C<scale load "$HOME/mybg.png"> scales the |
57 | image to the window size, so it relies on the window size and will |
59 | image to the window size, so it relies on the window size and will |
58 | be reevaluated each time it is changed, but not when it moves for |
60 | be reevaluated each time it is changed, but not when it moves for |
59 | example. That ensures that the picture always fills the terminal, even |
61 | example. That ensures that the picture always fills the terminal, even |
60 | after it's size changes. |
62 | after its size changes. |
61 | |
63 | |
62 | =head3 EXPRESSIONS |
64 | =head2 EXPRESSIONS |
63 | |
65 | |
64 | Expressions are normal Perl expressions, in fact, they are Perl blocks - |
66 | Expressions are normal Perl expressions, in fact, they are Perl blocks - |
65 | which means you could use multiple lines and statements: |
67 | which means you could use multiple lines and statements: |
66 | |
68 | |
67 | again 3600; |
69 | again 3600; |
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69 | return scale load "$HOME/weekday.png"; |
71 | return scale load "$HOME/weekday.png"; |
70 | } else { |
72 | } else { |
71 | return scale load "$HOME/sunday.png"; |
73 | return scale load "$HOME/sunday.png"; |
72 | } |
74 | } |
73 | |
75 | |
74 | This expression gets evaluated once per hour. It will set F<sunday.png> as |
76 | This expression is evaluated once per hour. It will set F<sunday.png> as |
75 | background on sundays, and F<weekday.png> on all other days. |
77 | background on Sundays, and F<weekday.png> on all other days. |
76 | |
78 | |
77 | Fortunately, we expect that most expressions will be much simpler, with |
79 | Fortunately, we expect that most expressions will be much simpler, with |
78 | little Perl knowledge needed. |
80 | little Perl knowledge needed. |
79 | |
81 | |
80 | Basically, you always start with a function that "generates" an image |
82 | Basically, you always start with a function that "generates" an image |
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97 | its result becomes the argument to the C<scale> function. |
99 | its result becomes the argument to the C<scale> function. |
98 | |
100 | |
99 | Many operators also allow some parameters preceding the input image |
101 | Many operators also allow some parameters preceding the input image |
100 | that modify its behaviour. For example, C<scale> without any additional |
102 | that modify its behaviour. For example, C<scale> without any additional |
101 | arguments scales the image to size of the terminal window. If you specify |
103 | arguments scales the image to size of the terminal window. If you specify |
102 | an additional argument, it uses it as a percentage: |
104 | an additional argument, it uses it as a scale factor (multiply by 100 to |
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105 | get a percentage): |
103 | |
106 | |
104 | scale 200, load "$HOME/mypic.png" |
107 | scale 2, load "$HOME/mypic.png" |
105 | |
108 | |
106 | This enlarges the image by a factor of 2 (200%). As you can see, C<scale> |
109 | This enlarges the image by a factor of 2 (200%). As you can see, C<scale> |
107 | has now two arguments, the C<200> and the C<load> expression, while |
110 | has now two arguments, the C<200> and the C<load> expression, while |
108 | C<load> only has one argument. Arguments are separated from each other by |
111 | C<load> only has one argument. Arguments are separated from each other by |
109 | commas. |
112 | commas. |
110 | |
113 | |
111 | Scale also accepts two arguments, which are then separate factors for both |
114 | Scale also accepts two arguments, which are then separate factors for both |
112 | horizontal and vertical dimensions. For example, this halves the image |
115 | horizontal and vertical dimensions. For example, this halves the image |
113 | width and doubles the image height: |
116 | width and doubles the image height: |
114 | |
117 | |
115 | scale 50, 200, load "$HOME/mypic.png" |
118 | scale 0.5, 2, load "$HOME/mypic.png" |
116 | |
119 | |
117 | TODO |
120 | Other effects than scaling are also readily available, for example, you can |
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121 | tile the image to fill the whole window, instead of resizing it: |
118 | |
122 | |
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123 | tile load "$HOME/mypic.png" |
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124 | |
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125 | In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator |
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126 | is kind of superfluous. |
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127 | |
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128 | Another common effect is to mirror the image, so that the same edges touch: |
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129 | |
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130 | mirror load "$HOME/mypic.png" |
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131 | |
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132 | This is also a typical background expression: |
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133 | |
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134 | rootalign root |
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135 | |
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136 | It first takes a snapshot of the screen background image, and then |
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137 | moves it to the upper left corner of the screen - the result is |
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138 | pseudo-transparency, as the image seems to be static while the window is |
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139 | moved around. |
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140 | |
119 | =head3 CYCLES AND CACHING |
141 | =head2 CYCLES AND CACHING |
120 | |
142 | |
121 | TODO |
143 | As has been mentioned before, the expression might be evaluated multiple |
122 | |
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123 | Each time the expression is reevaluated, a new cycle is said to have begun. Many operators |
144 | times. Each time the expression is reevaluated, a new cycle is said to |
124 | cache their results till the next cycle. For example |
145 | have begun. Many operators cache their results till the next cycle. |
125 | |
146 | |
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147 | For example, the C<load> operator keeps a copy of the image. If it is |
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148 | asked to load the same image on the next cycle it will not load it again, |
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149 | but return the cached copy. |
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150 | |
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151 | This only works for one cycle though, so as long as you load the same |
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152 | image every time, it will always be cached, but when you load a different |
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153 | image, it will forget about the first one. |
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154 | |
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155 | This allows you to either speed things up by keeping multiple images in |
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156 | memory, or conserve memory by loading images more often. |
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157 | |
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158 | For example, you can keep two images in memory and use a random one like |
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159 | this: |
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160 | |
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161 | my $img1 = load "img1.png"; |
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162 | my $img2 = load "img2.png"; |
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163 | (0.5 > rand) ? $img1 : $img2 |
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164 | |
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165 | Since both images are "loaded" every time the expression is evaluated, |
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166 | they are always kept in memory. Contrast this version: |
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167 | |
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168 | my $path1 = "img1.png"; |
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169 | my $path2 = "img2.png"; |
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170 | load ((0.5 > rand) ? $path1 : $path2) |
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171 | |
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172 | Here, a path is selected randomly, and load is only called for one image, |
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173 | so keeps only one image in memory. If, on the next evaluation, luck |
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174 | decides to use the other path, then it will have to load that image again. |
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175 | |
126 | =head2 REFERENCE |
176 | =head1 REFERENCE |
127 | |
177 | |
128 | =head3 COMMAND LINE SWITCHES |
178 | =head2 COMMAND LINE SWITCHES |
129 | |
179 | |
130 | =over 4 |
180 | =over 4 |
131 | |
181 | |
132 | =item --background-expr perl-expression |
182 | =item --background-expr perl-expression |
133 | |
183 | |
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139 | overwriting borders and any other areas, such as the scrollbar. |
189 | overwriting borders and any other areas, such as the scrollbar. |
140 | |
190 | |
141 | Specifying this flag changes the behaviour, so that the image only |
191 | Specifying this flag changes the behaviour, so that the image only |
142 | replaces the background of the character area. |
192 | replaces the background of the character area. |
143 | |
193 | |
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194 | =item --background-interval seconds |
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195 | |
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196 | Since some operations in the underlying XRender extension can effectively |
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197 | freeze your X-server for prolonged time, this extension enforces a minimum |
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198 | time between updates, which is normally about 0.1 seconds. |
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199 | |
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200 | If you want to do updates more often, you can decrease this safety |
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201 | interval with this switch. |
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202 | |
144 | =back |
203 | =back |
145 | |
204 | |
146 | =cut |
205 | =cut |
147 | |
206 | |
148 | our $EXPR;#d# |
207 | our %_IMG_CACHE; |
149 | #$EXPR = 'move W * 0.1, -H * 0.1, resize W * 0.5, H * 0.5, repeat_none load "opensource.png"'; |
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150 | $EXPR = 'move -TX, -TY, load "argb.png"'; |
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151 | #$EXPR = ' |
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152 | # rotate W, H, 50, 50, counter 1/59.95, repeat_mirror, |
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153 | # clip X, Y, W, H, repeat_mirror, |
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154 | # load "/root/pix/das_fette_schwein.jpg" |
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155 | #'; |
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156 | #$EXPR = 'solid "red"'; |
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157 | #$EXPR = 'blur root, 10, 10' |
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158 | #$EXPR = 'blur move (root, -x, -y), 5, 5' |
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159 | #resize load "/root/pix/das_fette_schwein.jpg", w, h |
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160 | |
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161 | our $HOME; |
208 | our $HOME; |
162 | our ($self, $old, $new); |
209 | our ($self, $old, $new); |
163 | our ($x, $y, $w, $h); |
210 | our ($x, $y, $w, $h); |
164 | |
211 | |
165 | # enforce at least this interval between updates |
212 | # enforce at least this interval between updates |
166 | our $MIN_INTERVAL = 1/100; |
213 | our $MIN_INTERVAL = 6/59.951; |
167 | |
214 | |
168 | { |
215 | { |
169 | package urxvt::bgdsl; # background language |
216 | package urxvt::bgdsl; # background language |
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217 | |
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218 | use List::Util qw(min max sum shuffle); |
170 | |
219 | |
171 | =head2 PROVIDERS/GENERATORS |
220 | =head2 PROVIDERS/GENERATORS |
172 | |
221 | |
173 | These functions provide an image, by loading it from disk, grabbing it |
222 | These functions provide an image, by loading it from disk, grabbing it |
174 | from the root screen or by simply generating it. They are used as starting |
223 | from the root screen or by simply generating it. They are used as starting |
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179 | =item load $path |
228 | =item load $path |
180 | |
229 | |
181 | Loads the image at the given C<$path>. The image is set to plane tiling |
230 | Loads the image at the given C<$path>. The image is set to plane tiling |
182 | mode. |
231 | mode. |
183 | |
232 | |
184 | Loaded images will be cached for one cycle. |
233 | Loaded images will be cached for one cycle, and shared between temrinals |
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234 | running in the same process (e.g. in C<urxvtd>). |
185 | |
235 | |
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236 | =item load_uc $path |
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237 | |
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238 | Load uncached - same as load, but does not cache the image. This function |
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239 | is most useufl if you want to optimise a background expression in some |
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240 | way. |
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241 | |
186 | =cut |
242 | =cut |
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243 | |
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244 | sub load_uc($) { |
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245 | my ($path) = @_; |
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246 | |
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247 | $_IMG_CACHE{$path} || do { |
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248 | my $img = $self->new_img_from_file ($path); |
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249 | Scalar::Util::weaken ($_IMG_CACHE{$path} = $img); |
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250 | $img |
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251 | } |
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252 | } |
187 | |
253 | |
188 | sub load($) { |
254 | sub load($) { |
189 | my ($path) = @_; |
255 | my ($path) = @_; |
190 | |
256 | |
191 | $new->{load}{$path} = $old->{load}{$path} || $self->new_img_from_file ($path); |
257 | $new->{load}{$path} = $old->{load}{$path} || load_uc $path; |
192 | } |
258 | } |
193 | |
259 | |
194 | =item root |
260 | =item root |
195 | |
261 | |
196 | Returns the root window pixmap, that is, hopefully, the background image |
262 | Returns the root window pixmap, that is, hopefully, the background image |
197 | of your screen. The image is set to extend mode. |
263 | of your screen. |
198 | |
264 | |
199 | This function makes your expression root sensitive, that means it will be |
265 | This function makes your expression root sensitive, that means it will be |
200 | reevaluated when the bg image changes. |
266 | reevaluated when the bg image changes. |
201 | |
267 | |
202 | =cut |
268 | =cut |
203 | |
269 | |
204 | sub root() { |
270 | sub root() { |
205 | $new->{rootpmap_sensitive} = 1; |
271 | $new->{again}{rootpmap} = 1; |
206 | die "root op not supported, exg, we need you"; |
272 | $self->new_img_from_root |
207 | } |
273 | } |
208 | |
274 | |
209 | =item solid $colour |
275 | =item solid $colour |
210 | |
276 | |
211 | =item solid $width, $height, $colour |
277 | =item solid $width, $height, $colour |
212 | |
278 | |
213 | Creates a new image and completely fills it with the given colour. The |
279 | Creates a new image and completely fills it with the given colour. The |
214 | image is set to tiling mode. |
280 | image is set to tiling mode. |
215 | |
281 | |
216 | If <$width> and C<$height> are omitted, it creates a 1x1 image, which is |
282 | If C<$width> and C<$height> are omitted, it creates a 1x1 image, which is |
217 | useful for solid backgrounds or for use in filtering effects. |
283 | useful for solid backgrounds or for use in filtering effects. |
218 | |
284 | |
219 | =cut |
285 | =cut |
220 | |
286 | |
221 | sub solid($$;$) { |
287 | sub solid($;$$) { |
222 | my $colour = pop; |
288 | my $colour = pop; |
223 | |
289 | |
224 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
290 | my $img = $self->new_img (urxvt::PictStandardARGB32, 0, 0, $_[0] || 1, $_[1] || 1); |
225 | $img->fill ($colour); |
291 | $img->fill ($colour); |
226 | $img |
292 | $img |
227 | } |
293 | } |
228 | |
294 | |
229 | =back |
295 | =item clone $img |
230 | |
296 | |
231 | =head2 VARIABLES |
297 | Returns an exact copy of the image. This is useful if you want to have |
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298 | multiple copies of the same image to apply different effects to. |
232 | |
299 | |
233 | The following functions provide variable data such as the terminal |
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234 | window dimensions. Most of them make your expression sensitive to some |
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235 | events, for example using C<TW> (terminal width) means your expression is |
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236 | evaluated again when the terminal is resized. |
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237 | |
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238 | =over 4 |
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239 | |
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240 | =item TX |
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241 | |
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242 | =item TY |
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243 | |
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244 | Return the X and Y coordinates of the terminal window (the terminal |
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245 | window is the full window by default, and the character area only when in |
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246 | border-respect mode). |
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247 | |
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248 | Using these functions make your expression sensitive to window moves. |
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249 | |
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250 | These functions are mainly useful to align images to the root window. |
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251 | |
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252 | Example: load an image and align it so it looks as if anchored to the |
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253 | background. |
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254 | |
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255 | move -TX, -TY, load "mybg.png" |
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256 | |
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257 | =item TW |
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258 | |
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259 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
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260 | terminal window is the full window by default, and the character area only |
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261 | when in border-respect mode). |
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262 | |
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263 | Using these functions make your expression sensitive to window resizes. |
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264 | |
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265 | These functions are mainly useful to scale images, or to clip images to |
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266 | the window size to conserve memory. |
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267 | |
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268 | Example: take the screen background, clip it to the window size, blur it a |
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269 | bit, align it to the window position and use it as background. |
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270 | |
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271 | clip move -TX, -TY, blur 5, root |
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272 | |
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273 | =cut |
300 | =cut |
274 | |
301 | |
275 | sub TX() { $new->{position_sensitive} = 1; $x } |
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276 | sub TY() { $new->{position_sensitive} = 1; $y } |
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277 | sub TW() { $new->{size_sensitive} = 1; $w } |
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278 | sub TH() { $new->{size_sensitive} = 1; $h } |
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279 | |
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280 | =item now |
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281 | |
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282 | Returns the current time as (fractional) seconds since the epoch. |
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283 | |
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284 | Using this expression does I<not> make your expression sensitive to time, |
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285 | but the next two functions do. |
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286 | |
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287 | =item again $seconds |
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288 | |
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289 | When this function is used the expression will be reevaluated again in |
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290 | C<$seconds> seconds. |
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291 | |
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292 | Example: load some image and rotate it according to the time of day (as if it were |
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293 | the hour pointer of a clock). Update this image every minute. |
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294 | |
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295 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
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296 | |
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297 | =item counter $seconds |
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298 | |
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299 | Like C<again>, but also returns an increasing counter value, starting at |
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300 | 0, which might be useful for some simple animation effects. |
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301 | |
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302 | =cut |
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303 | |
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304 | sub now() { urxvt::NOW } |
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305 | |
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306 | sub again($) { |
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307 | $new->{again} = $_[0]; |
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308 | } |
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309 | |
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310 | sub counter($) { |
302 | sub clone($) { |
311 | $new->{again} = $_[0]; |
303 | $_[0]->clone |
312 | $self->{counter} + 0 |
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313 | } |
304 | } |
314 | |
305 | |
315 | =back |
306 | =item merge $img ... |
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307 | |
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308 | Takes any number of images and merges them together, creating a single |
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309 | image containing them all. The tiling mode of the first image is used as |
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310 | the tiling mdoe of the resulting image. |
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311 | |
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312 | This function is called automatically when an expression returns multiple |
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313 | images. |
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314 | |
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315 | =cut |
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316 | |
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317 | sub merge(@) { |
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318 | return $_[0] unless $#_; |
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319 | |
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320 | # rather annoyingly clumsy, but optimisation is for another time |
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321 | |
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322 | my $x0 = +1e9; |
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323 | my $y0 = +1e9; |
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324 | my $x1 = -1e9; |
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325 | my $y1 = -1e9; |
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326 | |
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327 | for (@_) { |
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328 | my ($x, $y, $w, $h) = $_->geometry; |
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329 | |
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330 | $x0 = $x if $x0 > $x; |
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331 | $y0 = $y if $y0 > $y; |
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332 | |
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333 | $x += $w; |
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334 | $y += $h; |
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335 | |
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336 | $x1 = $x if $x1 < $x; |
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337 | $y1 = $y if $y1 < $y; |
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338 | } |
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339 | |
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340 | my $base = $self->new_img (urxvt::PictStandardARGB32, $x0, $y0, $x1 - $x0, $y1 - $y0); |
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341 | $base->repeat_mode ($_[0]->repeat_mode); |
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342 | $base->fill ([0, 0, 0, 0]); |
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343 | |
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344 | $base->draw ($_) |
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345 | for @_; |
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346 | |
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347 | $base |
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348 | } |
316 | |
349 | |
317 | =head2 TILING MODES |
350 | =head2 TILING MODES |
318 | |
351 | |
319 | The following operators modify the tiling mode of an image, that is, the |
352 | The following operators modify the tiling mode of an image, that is, the |
320 | way that pixels outside the image area are painted when the image is used. |
353 | way that pixels outside the image area are painted when the image is used. |
… | |
… | |
350 | become transparent. This mode is most useful when you want to place an |
383 | become transparent. This mode is most useful when you want to place an |
351 | image over another image or the background colour while leaving all |
384 | image over another image or the background colour while leaving all |
352 | background pixels outside the image unchanged. |
385 | background pixels outside the image unchanged. |
353 | |
386 | |
354 | Example: load an image and display it in the upper left corner. The rest |
387 | Example: load an image and display it in the upper left corner. The rest |
355 | of the space is left "empty" (transparent or wahtever your compisotr does |
388 | of the space is left "empty" (transparent or whatever your compositor does |
356 | in alpha mode, else background colour). |
389 | in alpha mode, else background colour). |
357 | |
390 | |
358 | pad load "mybg.png" |
391 | pad load "mybg.png" |
359 | |
392 | |
360 | =item extend $img |
393 | =item extend $img |
361 | |
394 | |
362 | Extends the image over the whole plane, using the closest pixel in the |
395 | Extends the image over the whole plane, using the closest pixel in the |
363 | area outside the image. This mode is mostly useful when you more complex |
396 | area outside the image. This mode is mostly useful when you use more complex |
364 | filtering operations and want the pixels outside the image to have the |
397 | filtering operations and want the pixels outside the image to have the |
365 | same values as the pixels near the edge. |
398 | same values as the pixels near the edge. |
366 | |
399 | |
367 | Example: just for curiosity, how does this pixel extension stuff work? |
400 | Example: just for curiosity, how does this pixel extension stuff work? |
368 | |
401 | |
… | |
… | |
394 | $img |
427 | $img |
395 | } |
428 | } |
396 | |
429 | |
397 | =back |
430 | =back |
398 | |
431 | |
399 | =head2 PIXEL OPERATORS |
432 | =head2 VARIABLE VALUES |
400 | |
433 | |
401 | The following operators modify the image pixels in various ways. |
434 | The following functions provide variable data such as the terminal window |
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435 | dimensions. They are not (Perl-) variables, they just return stuff that |
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436 | varies. Most of them make your expression sensitive to some events, for |
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437 | example using C<TW> (terminal width) means your expression is evaluated |
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438 | again when the terminal is resized. |
402 | |
439 | |
403 | =over 4 |
440 | =over 4 |
404 | |
441 | |
405 | =item clone $img |
442 | =item TX |
406 | |
443 | |
407 | Returns an exact copy of the image. |
444 | =item TY |
408 | |
445 | |
409 | =cut |
446 | Return the X and Y coordinates of the terminal window (the terminal |
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447 | window is the full window by default, and the character area only when in |
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448 | border-respect mode). |
410 | |
449 | |
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450 | Using these functions make your expression sensitive to window moves. |
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451 | |
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452 | These functions are mainly useful to align images to the root window. |
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453 | |
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454 | Example: load an image and align it so it looks as if anchored to the |
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455 | background. |
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456 | |
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457 | move -TX, -TY, load "mybg.png" |
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458 | |
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459 | =item TW |
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460 | |
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461 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
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462 | terminal window is the full window by default, and the character area only |
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463 | when in border-respect mode). |
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464 | |
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465 | Using these functions make your expression sensitive to window resizes. |
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466 | |
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467 | These functions are mainly useful to scale images, or to clip images to |
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468 | the window size to conserve memory. |
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469 | |
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470 | Example: take the screen background, clip it to the window size, blur it a |
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471 | bit, align it to the window position and use it as background. |
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472 | |
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473 | clip move -TX, -TY, once { blur 5, root } |
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474 | |
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475 | =cut |
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476 | |
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477 | sub TX() { $new->{again}{position} = 1; $x } |
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478 | sub TY() { $new->{again}{position} = 1; $y } |
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479 | sub TW() { $new->{again}{size} = 1; $w } |
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480 | sub TH() { $new->{again}{size} = 1; $h } |
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481 | |
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482 | =item now |
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483 | |
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484 | Returns the current time as (fractional) seconds since the epoch. |
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485 | |
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486 | Using this expression does I<not> make your expression sensitive to time, |
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487 | but the next two functions do. |
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488 | |
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489 | =item again $seconds |
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490 | |
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491 | When this function is used the expression will be reevaluated again in |
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492 | C<$seconds> seconds. |
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493 | |
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494 | Example: load some image and rotate it according to the time of day (as if it were |
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495 | the hour pointer of a clock). Update this image every minute. |
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496 | |
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497 | again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
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498 | |
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499 | =item counter $seconds |
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500 | |
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501 | Like C<again>, but also returns an increasing counter value, starting at |
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502 | 0, which might be useful for some simple animation effects. |
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503 | |
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504 | =cut |
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505 | |
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506 | sub now() { urxvt::NOW } |
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507 | |
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508 | sub again($) { |
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509 | $new->{again}{time} = $_[0]; |
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510 | } |
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511 | |
411 | sub clone($) { |
512 | sub counter($) { |
412 | $_[0]->clone |
513 | $new->{again}{time} = $_[0]; |
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514 | $self->{counter} + 0 |
413 | } |
515 | } |
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516 | |
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517 | =back |
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518 | |
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519 | =head2 SHAPE CHANGING OPERATORS |
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520 | |
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521 | The following operators modify the shape, size or position of the image. |
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522 | |
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523 | =over 4 |
414 | |
524 | |
415 | =item clip $img |
525 | =item clip $img |
416 | |
526 | |
417 | =item clip $width, $height, $img |
527 | =item clip $width, $height, $img |
418 | |
528 | |
… | |
… | |
442 | $img->sub_rect ($_[0], $_[1], $w, $h) |
552 | $img->sub_rect ($_[0], $_[1], $w, $h) |
443 | } |
553 | } |
444 | |
554 | |
445 | =item scale $img |
555 | =item scale $img |
446 | |
556 | |
447 | =item scale $size_percent, $img |
557 | =item scale $size_factor, $img |
448 | |
558 | |
449 | =item scale $width_percent, $height_percent, $img |
559 | =item scale $width_factor, $height_factor, $img |
450 | |
560 | |
451 | Scales the image by the given percentages in horizontal |
561 | Scales the image by the given factors in horizontal |
452 | (C<$width_percent>) and vertical (C<$height_percent>) direction. |
562 | (C<$width>) and vertical (C<$height>) direction. |
453 | |
563 | |
454 | If only one percentage is give, it is used for both directions. |
564 | If only one factor is give, it is used for both directions. |
455 | |
565 | |
456 | If no percentages are given, scales the image to the window size without |
566 | If no factors are given, scales the image to the window size without |
457 | keeping aspect. |
567 | keeping aspect. |
458 | |
568 | |
459 | =item resize $width, $height, $img |
569 | =item resize $width, $height, $img |
460 | |
570 | |
461 | Resizes the image to exactly C<$width> times C<$height> pixels. |
571 | Resizes the image to exactly C<$width> times C<$height> pixels. |
462 | |
572 | |
463 | =cut |
573 | =item fit $img |
464 | |
574 | |
465 | #TODO: maximise, maximise_fill? |
575 | =item fit $width, $height, $img |
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576 | |
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577 | Fits the image into the given C<$width> and C<$height> without changing |
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578 | aspect, or the terminal size. That means it will be shrunk or grown until |
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579 | the whole image fits into the given area, possibly leaving borders. |
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580 | |
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581 | =item cover $img |
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582 | |
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583 | =item cover $width, $height, $img |
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584 | |
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585 | Similar to C<fit>, but shrinks or grows until all of the area is covered |
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586 | by the image, so instead of potentially leaving borders, it will cut off |
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587 | image data that doesn't fit. |
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588 | |
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589 | =cut |
466 | |
590 | |
467 | sub scale($;$;$) { |
591 | sub scale($;$;$) { |
468 | my $img = pop; |
592 | my $img = pop; |
469 | |
593 | |
470 | @_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01) |
594 | @_ == 2 ? $img->scale ($_[0] * $img->w, $_[1] * $img->h) |
471 | : @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01) |
595 | : @_ ? $img->scale ($_[0] * $img->w, $_[0] * $img->h) |
472 | : $img->scale (TW, TH) |
596 | : $img->scale (TW, TH) |
473 | } |
597 | } |
474 | |
598 | |
475 | sub resize($$$) { |
599 | sub resize($$$) { |
476 | my $img = pop; |
600 | my $img = pop; |
477 | $img->scale ($_[0], $_[1]) |
601 | $img->scale ($_[0], $_[1]) |
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602 | } |
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603 | |
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604 | sub fit($;$$) { |
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605 | my $img = pop; |
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606 | my $w = ($_[0] || TW) / $img->w; |
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607 | my $h = ($_[1] || TH) / $img->h; |
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608 | scale +(min $w, $h), $img |
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609 | } |
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610 | |
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611 | sub cover($;$$) { |
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612 | my $img = pop; |
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613 | my $w = ($_[0] || TW) / $img->w; |
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614 | my $h = ($_[1] || TH) / $img->h; |
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615 | scale +(max $w, $h), $img |
478 | } |
616 | } |
479 | |
617 | |
480 | =item move $dx, $dy, $img |
618 | =item move $dx, $dy, $img |
481 | |
619 | |
482 | Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in |
620 | Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in |
483 | the vertical. |
621 | the vertical. |
484 | |
622 | |
485 | Example: move the image right by 20 pixels and down by 30. |
623 | Example: move the image right by 20 pixels and down by 30. |
486 | |
624 | |
487 | move 20, 30, ... |
625 | move 20, 30, ... |
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626 | |
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627 | =item align $xalign, $yalign, $img |
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628 | |
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629 | Aligns the image according to a factor - C<0> means the image is moved to |
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630 | the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is |
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631 | exactly centered and C<1> means it touches the right or bottom edge. |
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632 | |
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633 | Example: remove any visible border around an image, center it vertically but move |
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634 | it to the right hand side. |
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635 | |
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636 | align 1, 0.5, pad $img |
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637 | |
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638 | =item center $img |
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639 | |
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640 | =item center $width, $height, $img |
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641 | |
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642 | Centers the image, i.e. the center of the image is moved to the center of |
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643 | the terminal window (or the box specified by C<$width> and C<$height> if |
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644 | given). |
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645 | |
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646 | Example: load an image and center it. |
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647 | |
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648 | center pad load "mybg.png" |
488 | |
649 | |
489 | =item rootalign $img |
650 | =item rootalign $img |
490 | |
651 | |
491 | Moves the image so that it appears glued to the screen as opposed to the |
652 | Moves the image so that it appears glued to the screen as opposed to the |
492 | window. This gives the illusion of a larger area behind the window. It is |
653 | window. This gives the illusion of a larger area behind the window. It is |
… | |
… | |
498 | rootalign mirror load "mybg.png" |
659 | rootalign mirror load "mybg.png" |
499 | |
660 | |
500 | Example: take the screen background and align it, giving the illusion of |
661 | Example: take the screen background and align it, giving the illusion of |
501 | transparency as long as the window isn't in front of other windows. |
662 | transparency as long as the window isn't in front of other windows. |
502 | |
663 | |
503 | rootalign root |
664 | rootalign root |
504 | |
665 | |
505 | =cut |
666 | =cut |
506 | |
667 | |
507 | sub move($$;$) { |
668 | sub move($$;$) { |
508 | my $img = pop->clone; |
669 | my $img = pop->clone; |
509 | $img->move ($_[0], $_[1]); |
670 | $img->move ($_[0], $_[1]); |
510 | $img |
671 | $img |
511 | } |
672 | } |
512 | |
673 | |
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674 | sub align($;$$) { |
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675 | my $img = pop; |
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676 | |
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677 | move $_[0] * (TW - $img->w), |
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678 | $_[1] * (TH - $img->h), |
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679 | $img |
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680 | } |
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681 | |
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682 | sub center($;$$) { |
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683 | my $img = pop; |
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684 | my $w = $_[0] || TW; |
|
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685 | my $h = $_[1] || TH; |
|
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686 | |
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687 | move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img |
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688 | } |
|
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689 | |
513 | sub rootalign($) { |
690 | sub rootalign($) { |
514 | move -TX, -TY, $_[0] |
691 | move -TX, -TY, $_[0] |
515 | } |
692 | } |
516 | |
693 | |
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694 | =item rotate $center_x, $center_y, $degrees |
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695 | |
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696 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
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697 | pointer at C<$center_x> and C<$center_y> (specified as factor of image |
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698 | width/height). |
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699 | |
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700 | #TODO# new width, height, maybe more operators? |
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701 | |
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702 | Example: rotate the image by 90 degrees |
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703 | |
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704 | =cut |
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705 | |
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706 | sub rotate($$$$) { |
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707 | my $img = pop; |
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708 | $img->rotate ( |
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709 | $_[0] * ($img->w + $img->x), |
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710 | $_[1] * ($img->h + $img->y), |
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711 | $_[2] * (3.14159265 / 180), |
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712 | ) |
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713 | } |
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714 | |
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715 | =back |
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716 | |
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717 | =head2 COLOUR MODIFICATIONS |
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718 | |
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719 | The following operators change the pixels of the image. |
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720 | |
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|
721 | =over 4 |
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722 | |
517 | =item contrast $factor, $img |
723 | =item contrast $factor, $img |
518 | |
724 | |
519 | =item contrast $r, $g, $b, $img |
725 | =item contrast $r, $g, $b, $img |
520 | |
726 | |
521 | =item contrast $r, $g, $b, $a, $img |
727 | =item contrast $r, $g, $b, $a, $img |
522 | |
728 | |
523 | Adjusts the I<contrast> of an image. |
729 | Adjusts the I<contrast> of an image. |
524 | |
730 | |
|
|
731 | The first form applies a single C<$factor> to red, green and blue, the |
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732 | second form applies separate factors to each colour channel, and the last |
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|
733 | form includes the alpha channel. |
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734 | |
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735 | Values from 0 to 1 lower the contrast, values higher than 1 increase the |
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736 | contrast. |
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737 | |
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738 | Due to limitations in the underlying XRender extension, lowering contrast |
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|
739 | also reduces brightness, while increasing contrast currently also |
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|
740 | increases brightness. |
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|
741 | |
525 | =item brightness $factor, $img |
742 | =item brightness $bias, $img |
526 | |
743 | |
527 | =item brightness $r, $g, $b, $img |
744 | =item brightness $r, $g, $b, $img |
528 | |
745 | |
529 | =item brightness $r, $g, $b, $a, $img |
746 | =item brightness $r, $g, $b, $a, $img |
530 | |
747 | |
|
|
748 | Adjusts the brightness of an image. |
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749 | |
|
|
750 | The first form applies a single C<$bias> to red, green and blue, the |
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|
751 | second form applies separate biases to each colour channel, and the last |
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|
752 | form includes the alpha channel. |
|
|
753 | |
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|
754 | Values less than 0 reduce brightness, while values larger than 0 increase |
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|
755 | it. Useful range is from -1 to 1 - the former results in a black, the |
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|
756 | latter in a white picture. |
|
|
757 | |
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758 | Due to idiosyncrasies in the underlying XRender extension, biases less |
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|
759 | than zero can be I<very> slow. |
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|
760 | |
531 | =cut |
761 | =cut |
532 | |
762 | |
533 | sub contrast($$;$$;$) { |
763 | sub contrast($$;$$;$) { |
534 | my $img = pop; |
764 | my $img = pop; |
535 | my ($r, $g, $b, $a) = @_; |
765 | my ($r, $g, $b, $a) = @_; |
536 | |
766 | |
537 | ($g, $b) = ($r, $r) if @_ < 4; |
767 | ($g, $b) = ($r, $r) if @_ < 3; |
538 | $a = 1 if @_ < 5; |
768 | $a = 1 if @_ < 4; |
539 | |
769 | |
540 | $img = $img->clone; |
770 | $img = $img->clone; |
541 | # $img->contrast ($r, $g, $b, $a); |
771 | $img->contrast ($r, $g, $b, $a); |
542 | $img |
772 | $img |
543 | } |
773 | } |
544 | |
774 | |
545 | sub brightness($$;$$;$) { |
775 | sub brightness($$;$$;$) { |
546 | my $img = pop; |
776 | my $img = pop; |
547 | my ($r, $g, $b, $a) = @_; |
777 | my ($r, $g, $b, $a) = @_; |
548 | |
778 | |
549 | ($g, $b) = ($r, $r) if @_ < 4; |
779 | ($g, $b) = ($r, $r) if @_ < 3; |
550 | $a = 1 if @_ < 5; |
780 | $a = 1 if @_ < 4; |
551 | |
781 | |
552 | $img = $img->clone; |
782 | $img = $img->clone; |
553 | $img->brightness ($r, $g, $b, $a); |
783 | $img->brightness ($r, $g, $b, $a); |
554 | $img |
784 | $img |
555 | } |
785 | } |
556 | |
786 | |
|
|
787 | =item blur $radius, $img |
|
|
788 | |
|
|
789 | =item blur $radius_horz, $radius_vert, $img |
|
|
790 | |
|
|
791 | Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii |
|
|
792 | can also be specified separately. |
|
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793 | |
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|
794 | Blurring is often I<very> slow, at least compared or other |
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|
795 | operators. Larger blur radii are slower than smaller ones, too, so if you |
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|
796 | don't want to freeze your screen for long times, start experimenting with |
|
|
797 | low values for radius (<5). |
|
|
798 | |
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|
799 | =cut |
|
|
800 | |
557 | sub blur($$;$) { |
801 | sub blur($$;$) { |
558 | my $img = pop; |
802 | my $img = pop; |
559 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
803 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
560 | } |
804 | } |
561 | |
805 | |
562 | sub rotate($$$$$$) { |
806 | =back |
563 | my $img = pop; |
807 | |
564 | $img->rotate ( |
808 | =head2 OTHER STUFF |
565 | $_[0], |
809 | |
566 | $_[1], |
810 | Anything that didn't fit any of the other categories, even after applying |
567 | $_[2] * $img->w * .01, |
811 | force and closing our eyes. |
568 | $_[3] * $img->h * .01, |
812 | |
569 | $_[4] * (3.14159265 / 180), |
813 | =over 4 |
|
|
814 | |
|
|
815 | =item once { ... } |
|
|
816 | |
|
|
817 | This function takes a code block as argument, that is, one or more |
|
|
818 | statements enclosed by braces. |
|
|
819 | |
|
|
820 | The trick is that this code block is only evaluated once - future calls |
|
|
821 | will simply return the original image (yes, it should only be used with |
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|
822 | images). |
|
|
823 | |
|
|
824 | This can be extremely useful to avoid redoign the same slow operations |
|
|
825 | again and again- for example, if your background expression takes the root |
|
|
826 | background, blurs it and then root-aligns it it would have to blur the |
|
|
827 | root background on every window move or resize. |
|
|
828 | |
|
|
829 | Putting the blur into a C<once> block will make sure the blur is only done |
|
|
830 | once: |
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|
831 | |
|
|
832 | rootlign once { blur 10, root } |
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833 | |
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|
834 | This leaves the question of how to force reevaluation of the block, in |
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835 | case the root background changes: Right now, all once blocks forget that |
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|
836 | they ahve been executed before each time the root background changes (if |
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|
837 | the expression is sensitive to that) or when C<once_again> is called. |
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838 | |
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|
839 | =item once_again |
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840 | |
|
|
841 | Resets all C<once> block as if they had never been called, i.e. on the |
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842 | next call they will be reevaluated again. |
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843 | |
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|
844 | =cut |
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|
845 | |
|
|
846 | sub once(&) { |
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847 | my $once = $self->{once_cache}{$_[0]+0} ||= do { |
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|
848 | local $new->{again}; |
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|
849 | my @res = $_[0](); |
|
|
850 | [$new->{again}, \@res] |
570 | ) |
851 | }; |
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|
852 | |
|
|
853 | $new->{again} = { |
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|
854 | %{ $new->{again} }, |
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855 | %{ $once->[0] } |
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856 | }; |
|
|
857 | |
|
|
858 | # in scalar context we always return the first original result, which |
|
|
859 | # is not quite how perl works. |
|
|
860 | wantarray |
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|
861 | ? @{ $once->[1] } |
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|
862 | : $once->[1][0] |
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|
863 | } |
|
|
864 | |
|
|
865 | sub once_again() { |
|
|
866 | delete $self->{once_cache}; |
571 | } |
867 | } |
572 | |
868 | |
573 | =back |
869 | =back |
574 | |
870 | |
575 | =cut |
871 | =cut |
… | |
… | |
616 | ($x, $y, $w, $h) = |
912 | ($x, $y, $w, $h) = |
617 | $self->background_geometry ($self->{border}); |
913 | $self->background_geometry ($self->{border}); |
618 | |
914 | |
619 | # evaluate user expression |
915 | # evaluate user expression |
620 | |
916 | |
621 | my $img = eval { $self->{expr}->() }; |
917 | my $img = eval { urxvt::bgdsl::merge $self->{expr}->() }; |
622 | warn $@ if $@;#d# |
918 | die $@ if $@; |
623 | die if !UNIVERSAL::isa $img, "urxvt::img"; |
919 | die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img"; |
624 | |
920 | |
625 | $state->{size_sensitive} = 1 |
921 | # if the expression is sensitive to external events, prepare reevaluation then |
|
|
922 | |
|
|
923 | my $again = delete $state->{again}; |
|
|
924 | |
|
|
925 | $again->{size} = 1 |
626 | if $img->repeat_mode != urxvt::RepeatNormal; |
926 | if $img->repeat_mode != urxvt::RepeatNormal; |
627 | |
927 | |
628 | # if the expression is sensitive to external events, prepare reevaluation then |
|
|
629 | |
|
|
630 | my $repeat; |
|
|
631 | |
|
|
632 | if (my $again = $state->{again}) { |
928 | if (my $again = $again->{time}) { |
633 | $repeat = 1; |
|
|
634 | my $self = $self; |
929 | my $self = $self; |
635 | $state->{timer} = $again == $old->{again} |
930 | $state->{timer} = $again == $old->{again} |
636 | ? $old->{timer} |
931 | ? $old->{timer} |
637 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
932 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
638 | ++$self->{counter}; |
933 | ++$self->{counter}; |
639 | $self->recalculate |
934 | $self->recalculate |
640 | }); |
935 | }); |
641 | } |
936 | } |
642 | |
937 | |
643 | if (delete $state->{position_sensitive}) { |
938 | if ($again->{position}) { |
644 | $repeat = 1; |
|
|
645 | $self->enable (position_change => sub { $_[0]->recalculate }); |
939 | $self->enable (position_change => sub { $_[0]->recalculate }); |
646 | } else { |
940 | } else { |
647 | $self->disable ("position_change"); |
941 | $self->disable ("position_change"); |
648 | } |
942 | } |
649 | |
943 | |
650 | if (delete $state->{size_sensitive}) { |
944 | if ($again->{size}) { |
651 | $repeat = 1; |
|
|
652 | $self->enable (size_change => sub { $_[0]->recalculate }); |
945 | $self->enable (size_change => sub { $_[0]->recalculate }); |
653 | } else { |
946 | } else { |
654 | $self->disable ("size_change"); |
947 | $self->disable ("size_change"); |
655 | } |
948 | } |
656 | |
949 | |
657 | if (delete $state->{rootpmap_sensitive}) { |
950 | if ($again->{rootpmap}) { |
658 | $repeat = 1; |
|
|
659 | $self->enable (rootpmap_change => sub { $_[0]->recalculate }); |
951 | $self->enable (rootpmap_change => sub { |
|
|
952 | delete $_[0]{once_cache}; # this will override once-block values from |
|
|
953 | $_[0]->recalculate; |
|
|
954 | }); |
660 | } else { |
955 | } else { |
661 | $self->disable ("rootpmap_change"); |
956 | $self->disable ("rootpmap_change"); |
662 | } |
957 | } |
663 | |
958 | |
664 | # clear stuff we no longer need |
959 | # clear stuff we no longer need |
665 | |
960 | |
666 | %$old = (); |
961 | %$old = (); |
667 | |
962 | |
668 | unless ($repeat) { |
963 | unless (%$again) { |
669 | delete $self->{state}; |
964 | delete $self->{state}; |
670 | delete $self->{expr}; |
965 | delete $self->{expr}; |
671 | } |
966 | } |
672 | |
967 | |
673 | # set background pixmap |
968 | # set background pixmap |
… | |
… | |
678 | } |
973 | } |
679 | |
974 | |
680 | sub on_start { |
975 | sub on_start { |
681 | my ($self) = @_; |
976 | my ($self) = @_; |
682 | |
977 | |
683 | my $expr = $self->x_resource ("background.expr") |
978 | my $expr = $self->x_resource ("%.expr") |
684 | or return; |
979 | or return; |
685 | |
980 | |
|
|
981 | $self->has_render |
|
|
982 | or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n"; |
|
|
983 | |
686 | $self->set_expr (parse_expr $expr); |
984 | $self->set_expr (parse_expr $expr); |
687 | $self->{border} = $self->x_resource_boolean ("background.border"); |
985 | $self->{border} = $self->x_resource_boolean ("%.border"); |
|
|
986 | |
|
|
987 | $MIN_INTERVAL = $self->x_resource ("%.interval"); |
688 | |
988 | |
689 | () |
989 | () |
690 | } |
990 | } |
691 | |
991 | |