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 |
5 | |
5 | #:META:X_RESOURCE:%.interval:seconds:minimum time between updates |
6 | #TODO: once, rootalign |
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7 | |
6 | |
8 | =head1 NAME |
7 | =head1 NAME |
9 | |
8 | |
10 | background - manage terminal background |
9 | background - manage terminal background |
11 | |
10 | |
12 | =head1 SYNOPSIS |
11 | =head1 SYNOPSIS |
13 | |
12 | |
14 | urxvt --background-expr 'background expression' |
13 | urxvt --background-expr 'background expression' |
15 | --background-border |
14 | --background-border |
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15 | --background-interval seconds |
16 | |
16 | |
17 | =head1 DESCRIPTION |
17 | =head1 DESCRIPTION |
18 | |
18 | |
19 | This extension manages the terminal background by creating a picture that |
19 | This extension manages the terminal background by creating a picture that |
20 | is behind the text, replacing the normal background colour. |
20 | is behind the text, replacing the normal background colour. |
… | |
… | |
57 | |
57 | |
58 | 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 |
59 | 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 |
60 | 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 |
61 | example. That ensures that the picture always fills the terminal, even |
61 | example. That ensures that the picture always fills the terminal, even |
62 | after it's size changes. |
62 | after its size changes. |
63 | |
63 | |
64 | =head2 EXPRESSIONS |
64 | =head2 EXPRESSIONS |
65 | |
65 | |
66 | Expressions are normal Perl expressions, in fact, they are Perl blocks - |
66 | Expressions are normal Perl expressions, in fact, they are Perl blocks - |
67 | which means you could use multiple lines and statements: |
67 | which means you could use multiple lines and statements: |
… | |
… | |
71 | return scale load "$HOME/weekday.png"; |
71 | return scale load "$HOME/weekday.png"; |
72 | } else { |
72 | } else { |
73 | return scale load "$HOME/sunday.png"; |
73 | return scale load "$HOME/sunday.png"; |
74 | } |
74 | } |
75 | |
75 | |
76 | 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 |
77 | background on Sundays, and F<weekday.png> on all other days. |
77 | background on Sundays, and F<weekday.png> on all other days. |
78 | |
78 | |
79 | Fortunately, we expect that most expressions will be much simpler, with |
79 | Fortunately, we expect that most expressions will be much simpler, with |
80 | little Perl knowledge needed. |
80 | little Perl knowledge needed. |
81 | |
81 | |
… | |
… | |
115 | horizontal and vertical dimensions. For example, this halves the image |
115 | horizontal and vertical dimensions. For example, this halves the image |
116 | width and doubles the image height: |
116 | width and doubles the image height: |
117 | |
117 | |
118 | scale 0.5, 2, load "$HOME/mypic.png" |
118 | scale 0.5, 2, load "$HOME/mypic.png" |
119 | |
119 | |
120 | Other effects than scalign are also readily available, for exmaple, you can |
120 | Other effects than scaling are also readily available, for example, you can |
121 | tile the image to fill the whole window, instead of resizing it: |
121 | tile the image to fill the whole window, instead of resizing it: |
122 | |
122 | |
123 | tile load "$HOME/mypic.png" |
123 | tile load "$HOME/mypic.png" |
124 | |
124 | |
125 | In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator |
125 | In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator |
… | |
… | |
151 | This only works for one cycle though, so as long as you load the same |
151 | This only works for one cycle though, so as long as you load the same |
152 | image every time, it will always be cached, but when you load a different |
152 | image every time, it will always be cached, but when you load a different |
153 | image, it will forget about the first one. |
153 | image, it will forget about the first one. |
154 | |
154 | |
155 | This allows you to either speed things up by keeping multiple images in |
155 | This allows you to either speed things up by keeping multiple images in |
156 | memory, or comserve memory by loading images more often. |
156 | memory, or conserve memory by loading images more often. |
157 | |
157 | |
158 | For example, you can keep two images in memory and use a random one like |
158 | For example, you can keep two images in memory and use a random one like |
159 | this: |
159 | this: |
160 | |
160 | |
161 | my $img1 = load "img1.png"; |
161 | my $img1 = load "img1.png"; |
… | |
… | |
189 | overwriting borders and any other areas, such as the scrollbar. |
189 | overwriting borders and any other areas, such as the scrollbar. |
190 | |
190 | |
191 | Specifying this flag changes the behaviour, so that the image only |
191 | Specifying this flag changes the behaviour, so that the image only |
192 | replaces the background of the character area. |
192 | replaces the background of the character area. |
193 | |
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 | |
194 | =back |
203 | =back |
195 | |
204 | |
196 | =cut |
205 | =cut |
197 | |
206 | |
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207 | our %_IMG_CACHE; |
198 | our $HOME; |
208 | our $HOME; |
199 | our ($self, $old, $new); |
209 | our ($self, $old, $new); |
200 | our ($x, $y, $w, $h); |
210 | our ($x, $y, $w, $h); |
201 | |
211 | |
202 | # enforce at least this interval between updates |
212 | # enforce at least this interval between updates |
203 | our $MIN_INTERVAL = 1/100; |
213 | our $MIN_INTERVAL = 6/59.951; |
204 | |
214 | |
205 | { |
215 | { |
206 | package urxvt::bgdsl; # background language |
216 | package urxvt::bgdsl; # background language |
207 | |
217 | |
208 | use List::Util qw(min max sum shuffle); |
218 | use List::Util qw(min max sum shuffle); |
… | |
… | |
218 | =item load $path |
228 | =item load $path |
219 | |
229 | |
220 | Loads the image at the given C<$path>. The image is set to plane tiling |
230 | Loads the image at the given C<$path>. The image is set to plane tiling |
221 | mode. |
231 | mode. |
222 | |
232 | |
223 | 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>). |
224 | |
235 | |
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236 | =item load_uc $path |
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237 | |
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238 | Load uncached - same as load, but does not cache the image. This function |
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239 | is most useufl if you want to optimise a background expression in some |
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240 | way. |
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241 | |
225 | =cut |
242 | =cut |
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243 | |
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244 | sub load_uc($) { |
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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 | $img |
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251 | } |
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252 | } |
226 | |
253 | |
227 | sub load($) { |
254 | sub load($) { |
228 | my ($path) = @_; |
255 | my ($path) = @_; |
229 | |
256 | |
230 | $new->{load}{$path} = $old->{load}{$path} || $self->new_img_from_file ($path); |
257 | $new->{load}{$path} = $old->{load}{$path} || load_uc $path; |
231 | } |
258 | } |
232 | |
259 | |
233 | =item root |
260 | =item root |
234 | |
261 | |
235 | Returns the root window pixmap, that is, hopefully, the background image |
262 | Returns the root window pixmap, that is, hopefully, the background image |
… | |
… | |
239 | reevaluated when the bg image changes. |
266 | reevaluated when the bg image changes. |
240 | |
267 | |
241 | =cut |
268 | =cut |
242 | |
269 | |
243 | sub root() { |
270 | sub root() { |
244 | $new->{rootpmap_sensitive} = 1; |
271 | $new->{again}{rootpmap} = 1; |
245 | die "root op not supported, exg, we need you"; |
272 | $self->new_img_from_root |
246 | } |
273 | } |
247 | |
274 | |
248 | =item solid $colour |
275 | =item solid $colour |
249 | |
276 | |
250 | =item solid $width, $height, $colour |
277 | =item solid $width, $height, $colour |
… | |
… | |
258 | =cut |
285 | =cut |
259 | |
286 | |
260 | sub solid($;$$) { |
287 | sub solid($;$$) { |
261 | my $colour = pop; |
288 | my $colour = pop; |
262 | |
289 | |
263 | 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); |
264 | $img->fill ($colour); |
291 | $img->fill ($colour); |
265 | $img |
292 | $img |
266 | } |
293 | } |
267 | |
294 | |
268 | =back |
295 | =item clone $img |
269 | |
296 | |
270 | =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. |
271 | |
299 | |
272 | The following functions provide variable data such as the terminal window |
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273 | dimensions. They are not (Perl-) variables, they jsut return stuff that |
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274 | varies. Most of them make your expression sensitive to some events, for |
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275 | example using C<TW> (terminal width) means your expression is evaluated |
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276 | again when the terminal is resized. |
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277 | |
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278 | =over 4 |
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279 | |
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280 | =item TX |
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281 | |
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282 | =item TY |
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283 | |
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284 | Return the X and Y coordinates of the terminal window (the terminal |
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285 | window is the full window by default, and the character area only when in |
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286 | border-respect mode). |
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287 | |
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288 | Using these functions make your expression sensitive to window moves. |
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289 | |
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290 | These functions are mainly useful to align images to the root window. |
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291 | |
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292 | Example: load an image and align it so it looks as if anchored to the |
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293 | background. |
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294 | |
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295 | move -TX, -TY, load "mybg.png" |
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296 | |
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297 | =item TW |
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298 | |
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299 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
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300 | terminal window is the full window by default, and the character area only |
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301 | when in border-respect mode). |
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302 | |
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303 | Using these functions make your expression sensitive to window resizes. |
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304 | |
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305 | These functions are mainly useful to scale images, or to clip images to |
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306 | the window size to conserve memory. |
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307 | |
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308 | Example: take the screen background, clip it to the window size, blur it a |
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309 | bit, align it to the window position and use it as background. |
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310 | |
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311 | clip move -TX, -TY, blur 5, root |
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312 | |
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313 | =cut |
300 | =cut |
314 | |
301 | |
315 | sub TX() { $new->{position_sensitive} = 1; $x } |
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316 | sub TY() { $new->{position_sensitive} = 1; $y } |
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317 | sub TW() { $new->{size_sensitive} = 1; $w } |
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318 | sub TH() { $new->{size_sensitive} = 1; $h } |
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319 | |
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320 | =item now |
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321 | |
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322 | Returns the current time as (fractional) seconds since the epoch. |
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323 | |
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324 | Using this expression does I<not> make your expression sensitive to time, |
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325 | but the next two functions do. |
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326 | |
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327 | =item again $seconds |
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328 | |
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329 | When this function is used the expression will be reevaluated again in |
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330 | C<$seconds> seconds. |
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331 | |
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332 | Example: load some image and rotate it according to the time of day (as if it were |
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333 | the hour pointer of a clock). Update this image every minute. |
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334 | |
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335 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
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336 | |
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337 | =item counter $seconds |
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338 | |
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339 | Like C<again>, but also returns an increasing counter value, starting at |
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340 | 0, which might be useful for some simple animation effects. |
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341 | |
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342 | =cut |
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343 | |
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344 | sub now() { urxvt::NOW } |
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345 | |
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346 | sub again($) { |
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347 | $new->{again} = $_[0]; |
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348 | } |
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349 | |
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350 | sub counter($) { |
302 | sub clone($) { |
351 | $new->{again} = $_[0]; |
303 | $_[0]->clone |
352 | $self->{counter} + 0 |
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353 | } |
304 | } |
354 | |
305 | |
355 | =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. |
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310 | |
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311 | =cut |
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312 | |
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313 | sub merge(@) { |
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314 | # rather annoyingly clumsy, but optimisation is for another time |
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315 | |
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316 | my $x0 = +1e9; |
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317 | my $y0 = +1e9; |
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318 | my $x1 = -1e9; |
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319 | my $y1 = -1e9; |
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320 | |
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321 | for (@_) { |
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322 | my ($x, $y, $w, $h) = $_->geometry; |
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323 | |
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324 | $x0 = $x if $x0 > $x; |
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325 | $y0 = $y if $y0 > $y; |
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326 | |
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327 | $x += $w; |
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328 | $y += $h; |
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329 | |
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330 | $x1 = $x if $x1 < $x; |
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331 | $y1 = $y if $y1 < $y; |
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332 | } |
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333 | |
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334 | my $base = $self->new_img (urxvt::PictStandardARGB32, $x0, $y0, $x1 - $x0, $y1 - $y0); |
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335 | $base->fill ([0, 0, 0, 0]); |
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336 | |
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337 | $base->draw ($_) |
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338 | for @_; |
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339 | |
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340 | $base |
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341 | } |
356 | |
342 | |
357 | =head2 TILING MODES |
343 | =head2 TILING MODES |
358 | |
344 | |
359 | The following operators modify the tiling mode of an image, that is, the |
345 | The following operators modify the tiling mode of an image, that is, the |
360 | way that pixels outside the image area are painted when the image is used. |
346 | way that pixels outside the image area are painted when the image is used. |
… | |
… | |
390 | become transparent. This mode is most useful when you want to place an |
376 | become transparent. This mode is most useful when you want to place an |
391 | image over another image or the background colour while leaving all |
377 | image over another image or the background colour while leaving all |
392 | background pixels outside the image unchanged. |
378 | background pixels outside the image unchanged. |
393 | |
379 | |
394 | Example: load an image and display it in the upper left corner. The rest |
380 | Example: load an image and display it in the upper left corner. The rest |
395 | of the space is left "empty" (transparent or wahtever your compisotr does |
381 | of the space is left "empty" (transparent or whatever your compositor does |
396 | in alpha mode, else background colour). |
382 | in alpha mode, else background colour). |
397 | |
383 | |
398 | pad load "mybg.png" |
384 | pad load "mybg.png" |
399 | |
385 | |
400 | =item extend $img |
386 | =item extend $img |
401 | |
387 | |
402 | Extends the image over the whole plane, using the closest pixel in the |
388 | Extends the image over the whole plane, using the closest pixel in the |
403 | area outside the image. This mode is mostly useful when you more complex |
389 | area outside the image. This mode is mostly useful when you use more complex |
404 | filtering operations and want the pixels outside the image to have the |
390 | filtering operations and want the pixels outside the image to have the |
405 | same values as the pixels near the edge. |
391 | same values as the pixels near the edge. |
406 | |
392 | |
407 | Example: just for curiosity, how does this pixel extension stuff work? |
393 | Example: just for curiosity, how does this pixel extension stuff work? |
408 | |
394 | |
… | |
… | |
434 | $img |
420 | $img |
435 | } |
421 | } |
436 | |
422 | |
437 | =back |
423 | =back |
438 | |
424 | |
439 | =head2 PIXEL OPERATORS |
425 | =head2 VARIABLE VALUES |
440 | |
426 | |
441 | The following operators modify the image pixels in various ways. |
427 | The following functions provide variable data such as the terminal window |
|
|
428 | dimensions. They are not (Perl-) variables, they just return stuff that |
|
|
429 | varies. Most of them make your expression sensitive to some events, for |
|
|
430 | example using C<TW> (terminal width) means your expression is evaluated |
|
|
431 | again when the terminal is resized. |
442 | |
432 | |
443 | =over 4 |
433 | =over 4 |
444 | |
434 | |
445 | =item clone $img |
435 | =item TX |
446 | |
436 | |
447 | Returns an exact copy of the image. |
437 | =item TY |
448 | |
438 | |
449 | =cut |
439 | Return the X and Y coordinates of the terminal window (the terminal |
|
|
440 | window is the full window by default, and the character area only when in |
|
|
441 | border-respect mode). |
450 | |
442 | |
|
|
443 | Using these functions make your expression sensitive to window moves. |
|
|
444 | |
|
|
445 | These functions are mainly useful to align images to the root window. |
|
|
446 | |
|
|
447 | Example: load an image and align it so it looks as if anchored to the |
|
|
448 | background. |
|
|
449 | |
|
|
450 | move -TX, -TY, load "mybg.png" |
|
|
451 | |
|
|
452 | =item TW |
|
|
453 | |
|
|
454 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
|
|
455 | terminal window is the full window by default, and the character area only |
|
|
456 | when in border-respect mode). |
|
|
457 | |
|
|
458 | Using these functions make your expression sensitive to window resizes. |
|
|
459 | |
|
|
460 | These functions are mainly useful to scale images, or to clip images to |
|
|
461 | the window size to conserve memory. |
|
|
462 | |
|
|
463 | Example: take the screen background, clip it to the window size, blur it a |
|
|
464 | bit, align it to the window position and use it as background. |
|
|
465 | |
|
|
466 | clip move -TX, -TY, once { blur 5, root } |
|
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467 | |
|
|
468 | =cut |
|
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469 | |
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|
470 | sub TX() { $new->{again}{position} = 1; $x } |
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471 | sub TY() { $new->{again}{position} = 1; $y } |
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472 | sub TW() { $new->{again}{size} = 1; $w } |
|
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473 | sub TH() { $new->{again}{size} = 1; $h } |
|
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474 | |
|
|
475 | =item now |
|
|
476 | |
|
|
477 | Returns the current time as (fractional) seconds since the epoch. |
|
|
478 | |
|
|
479 | Using this expression does I<not> make your expression sensitive to time, |
|
|
480 | but the next two functions do. |
|
|
481 | |
|
|
482 | =item again $seconds |
|
|
483 | |
|
|
484 | When this function is used the expression will be reevaluated again in |
|
|
485 | C<$seconds> seconds. |
|
|
486 | |
|
|
487 | Example: load some image and rotate it according to the time of day (as if it were |
|
|
488 | the hour pointer of a clock). Update this image every minute. |
|
|
489 | |
|
|
490 | again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
|
|
491 | |
|
|
492 | =item counter $seconds |
|
|
493 | |
|
|
494 | Like C<again>, but also returns an increasing counter value, starting at |
|
|
495 | 0, which might be useful for some simple animation effects. |
|
|
496 | |
|
|
497 | =cut |
|
|
498 | |
|
|
499 | sub now() { urxvt::NOW } |
|
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500 | |
|
|
501 | sub again($) { |
|
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502 | $new->{again}{time} = $_[0]; |
|
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503 | } |
|
|
504 | |
451 | sub clone($) { |
505 | sub counter($) { |
452 | $_[0]->clone |
506 | $new->{again}{time} = $_[0]; |
|
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507 | $self->{counter} + 0 |
453 | } |
508 | } |
|
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509 | |
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510 | =back |
|
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511 | |
|
|
512 | =head2 SHAPE CHANGING OPERATORS |
|
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513 | |
|
|
514 | The following operators modify the shape, size or position of the image. |
|
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515 | |
|
|
516 | =over 4 |
454 | |
517 | |
455 | =item clip $img |
518 | =item clip $img |
456 | |
519 | |
457 | =item clip $width, $height, $img |
520 | =item clip $width, $height, $img |
458 | |
521 | |
… | |
… | |
552 | |
615 | |
553 | Example: move the image right by 20 pixels and down by 30. |
616 | Example: move the image right by 20 pixels and down by 30. |
554 | |
617 | |
555 | move 20, 30, ... |
618 | move 20, 30, ... |
556 | |
619 | |
|
|
620 | =item align $xalign, $yalign, $img |
|
|
621 | |
|
|
622 | Aligns the image according to a factor - C<0> means the image is moved to |
|
|
623 | the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is |
|
|
624 | exactly centered and C<1> means it touches the right or bottom edge. |
|
|
625 | |
|
|
626 | Example: remove any visible border around an image, center it vertically but move |
|
|
627 | it to the right hand side. |
|
|
628 | |
|
|
629 | align 1, 0.5, pad $img |
|
|
630 | |
|
|
631 | =item center $img |
|
|
632 | |
|
|
633 | =item center $width, $height, $img |
|
|
634 | |
|
|
635 | Centers the image, i.e. the center of the image is moved to the center of |
|
|
636 | the terminal window (or the box specified by C<$width> and C<$height> if |
|
|
637 | given). |
|
|
638 | |
|
|
639 | Example: load an image and center it. |
|
|
640 | |
|
|
641 | center pad load "mybg.png" |
|
|
642 | |
557 | =item rootalign $img |
643 | =item rootalign $img |
558 | |
644 | |
559 | Moves the image so that it appears glued to the screen as opposed to the |
645 | Moves the image so that it appears glued to the screen as opposed to the |
560 | window. This gives the illusion of a larger area behind the window. It is |
646 | window. This gives the illusion of a larger area behind the window. It is |
561 | exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the |
647 | exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the |
… | |
… | |
566 | rootalign mirror load "mybg.png" |
652 | rootalign mirror load "mybg.png" |
567 | |
653 | |
568 | Example: take the screen background and align it, giving the illusion of |
654 | Example: take the screen background and align it, giving the illusion of |
569 | transparency as long as the window isn't in front of other windows. |
655 | transparency as long as the window isn't in front of other windows. |
570 | |
656 | |
571 | rootalign root |
657 | rootalign root |
572 | |
658 | |
573 | =cut |
659 | =cut |
574 | |
660 | |
575 | sub move($$;$) { |
661 | sub move($$;$) { |
576 | my $img = pop->clone; |
662 | my $img = pop->clone; |
577 | $img->move ($_[0], $_[1]); |
663 | $img->move ($_[0], $_[1]); |
578 | $img |
664 | $img |
579 | } |
665 | } |
580 | |
666 | |
|
|
667 | sub align($;$$) { |
|
|
668 | my $img = pop; |
|
|
669 | |
|
|
670 | move $_[0] * (TW - $img->w), |
|
|
671 | $_[1] * (TH - $img->h), |
|
|
672 | $img |
|
|
673 | } |
|
|
674 | |
|
|
675 | sub center($;$$) { |
|
|
676 | my $img = pop; |
|
|
677 | my $w = $_[0] || TW; |
|
|
678 | my $h = $_[1] || TH; |
|
|
679 | |
|
|
680 | move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img |
|
|
681 | } |
|
|
682 | |
581 | sub rootalign($) { |
683 | sub rootalign($) { |
582 | move -TX, -TY, $_[0] |
684 | move -TX, -TY, $_[0] |
583 | } |
685 | } |
584 | |
686 | |
|
|
687 | =item rotate $center_x, $center_y, $degrees |
|
|
688 | |
|
|
689 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
|
|
690 | pointer at C<$center_x> and C<$center_y> (specified as factor of image |
|
|
691 | width/height). |
|
|
692 | |
|
|
693 | #TODO# new width, height, maybe more operators? |
|
|
694 | |
|
|
695 | Example: rotate the image by 90 degrees |
|
|
696 | |
|
|
697 | =cut |
|
|
698 | |
|
|
699 | sub rotate($$$$) { |
|
|
700 | my $img = pop; |
|
|
701 | $img->rotate ( |
|
|
702 | $_[0] * ($img->w + $img->x), |
|
|
703 | $_[1] * ($img->h + $img->y), |
|
|
704 | $_[2] * (3.14159265 / 180), |
|
|
705 | ) |
|
|
706 | } |
|
|
707 | |
|
|
708 | =back |
|
|
709 | |
|
|
710 | =head2 COLOUR MODIFICATIONS |
|
|
711 | |
|
|
712 | The following operators change the pixels of the image. |
|
|
713 | |
|
|
714 | =over 4 |
|
|
715 | |
585 | =item contrast $factor, $img |
716 | =item contrast $factor, $img |
586 | |
717 | |
587 | =item contrast $r, $g, $b, $img |
718 | =item contrast $r, $g, $b, $img |
588 | |
719 | |
589 | =item contrast $r, $g, $b, $a, $img |
720 | =item contrast $r, $g, $b, $a, $img |
590 | |
721 | |
591 | Adjusts the I<contrast> of an image. |
722 | Adjusts the I<contrast> of an image. |
592 | |
723 | |
593 | #TODO# |
724 | The first form applies a single C<$factor> to red, green and blue, the |
|
|
725 | second form applies separate factors to each colour channel, and the last |
|
|
726 | form includes the alpha channel. |
594 | |
727 | |
|
|
728 | Values from 0 to 1 lower the contrast, values higher than 1 increase the |
|
|
729 | contrast. |
|
|
730 | |
|
|
731 | Due to limitations in the underlying XRender extension, lowering contrast |
|
|
732 | also reduces brightness, while increasing contrast currently also |
|
|
733 | increases brightness. |
|
|
734 | |
595 | =item brightness $factor, $img |
735 | =item brightness $bias, $img |
596 | |
736 | |
597 | =item brightness $r, $g, $b, $img |
737 | =item brightness $r, $g, $b, $img |
598 | |
738 | |
599 | =item brightness $r, $g, $b, $a, $img |
739 | =item brightness $r, $g, $b, $a, $img |
600 | |
740 | |
601 | Adjusts the brightness of an image. |
741 | Adjusts the brightness of an image. |
602 | |
742 | |
|
|
743 | The first form applies a single C<$bias> to red, green and blue, the |
|
|
744 | second form applies separate biases to each colour channel, and the last |
|
|
745 | form includes the alpha channel. |
|
|
746 | |
|
|
747 | Values less than 0 reduce brightness, while values larger than 0 increase |
|
|
748 | it. Useful range is from -1 to 1 - the former results in a black, the |
|
|
749 | latter in a white picture. |
|
|
750 | |
|
|
751 | Due to idiosyncrasies in the underlying XRender extension, biases less |
|
|
752 | than zero can be I<very> slow. |
|
|
753 | |
603 | =cut |
754 | =cut |
604 | |
755 | |
605 | sub contrast($$;$$;$) { |
756 | sub contrast($$;$$;$) { |
606 | my $img = pop; |
757 | my $img = pop; |
607 | my ($r, $g, $b, $a) = @_; |
758 | my ($r, $g, $b, $a) = @_; |
608 | |
759 | |
609 | ($g, $b) = ($r, $r) if @_ < 4; |
760 | ($g, $b) = ($r, $r) if @_ < 3; |
610 | $a = 1 if @_ < 5; |
761 | $a = 1 if @_ < 4; |
611 | |
762 | |
612 | $img = $img->clone; |
763 | $img = $img->clone; |
613 | $img->contrast ($r, $g, $b, $a); |
764 | $img->contrast ($r, $g, $b, $a); |
614 | $img |
765 | $img |
615 | } |
766 | } |
616 | |
767 | |
617 | sub brightness($$;$$;$) { |
768 | sub brightness($$;$$;$) { |
618 | my $img = pop; |
769 | my $img = pop; |
619 | my ($r, $g, $b, $a) = @_; |
770 | my ($r, $g, $b, $a) = @_; |
620 | |
771 | |
621 | ($g, $b) = ($r, $r) if @_ < 4; |
772 | ($g, $b) = ($r, $r) if @_ < 3; |
622 | $a = 1 if @_ < 5; |
773 | $a = 1 if @_ < 4; |
623 | |
774 | |
624 | $img = $img->clone; |
775 | $img = $img->clone; |
625 | $img->brightness ($r, $g, $b, $a); |
776 | $img->brightness ($r, $g, $b, $a); |
626 | $img |
777 | $img |
627 | } |
778 | } |
… | |
… | |
643 | sub blur($$;$) { |
794 | sub blur($$;$) { |
644 | my $img = pop; |
795 | my $img = pop; |
645 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
796 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
646 | } |
797 | } |
647 | |
798 | |
648 | =item rotate $new_width, $new_height, $center_x, $center_y, $degrees |
799 | =back |
649 | |
800 | |
650 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
801 | =head2 OTHER STUFF |
651 | pointer at C<$center_x> and C<$center_y> (specified as factor of image |
|
|
652 | width/height), generating a new image with width C<$new_width> and height |
|
|
653 | C<$new_height>. |
|
|
654 | |
802 | |
655 | #TODO# new width, height, maybe more operators? |
803 | Anything that didn't fit any of the other categories, even after applying |
|
|
804 | force and closing our eyes. |
656 | |
805 | |
657 | Example: rotate the image by 90 degrees |
806 | =over 4 |
658 | |
807 | |
659 | =cut |
808 | =item once { ... } |
660 | |
809 | |
661 | sub rotate($$$$$$) { |
810 | This function takes a code block as argument, that is, one or more |
662 | my $img = pop; |
811 | statements enclosed by braces. |
663 | $img->rotate ( |
812 | |
664 | $_[0], |
813 | The trick is that this code block is only evaluated once - future calls |
665 | $_[1], |
814 | will simply return the original image (yes, it should only be used with |
666 | $_[2] * $img->w, |
815 | images). |
667 | $_[3] * $img->h, |
816 | |
668 | $_[4] * (3.14159265 / 180), |
817 | This can be extremely useful to avoid redoign the same slow operations |
|
|
818 | again and again- for example, if your background expression takes the root |
|
|
819 | background, blurs it and then root-aligns it it would have to blur the |
|
|
820 | root background on every window move or resize. |
|
|
821 | |
|
|
822 | Putting the blur into a C<once> block will make sure the blur is only done |
|
|
823 | once: |
|
|
824 | |
|
|
825 | rootlign once { blur 10, root } |
|
|
826 | |
|
|
827 | This leaves the question of how to force reevaluation of the block, in |
|
|
828 | case the root background changes: Right now, all once blocks forget that |
|
|
829 | they ahve been executed before each time the root background changes (if |
|
|
830 | the expression is sensitive to that) or when C<once_again> is called. |
|
|
831 | |
|
|
832 | =item once_again |
|
|
833 | |
|
|
834 | Resets all C<once> block as if they had never been called, i.e. on the |
|
|
835 | next call they will be reevaluated again. |
|
|
836 | |
|
|
837 | =cut |
|
|
838 | |
|
|
839 | sub once(&) { |
|
|
840 | my $once = $self->{once_cache}{$_[0]+0} ||= do { |
|
|
841 | local $new->{again}; |
|
|
842 | my @res = $_[0](); |
|
|
843 | [$new->{again}, \@res] |
669 | ) |
844 | }; |
|
|
845 | |
|
|
846 | $new->{again} = { |
|
|
847 | %{ $new->{again} }, |
|
|
848 | %{ $once->[0] } |
|
|
849 | }; |
|
|
850 | |
|
|
851 | # in scalar context we always return the first original result, which |
|
|
852 | # is not quite how perl works. |
|
|
853 | wantarray |
|
|
854 | ? @{ $once->[1] } |
|
|
855 | : $once->[1][0] |
|
|
856 | } |
|
|
857 | |
|
|
858 | sub once_again() { |
|
|
859 | delete $self->{once_cache}; |
670 | } |
860 | } |
671 | |
861 | |
672 | =back |
862 | =back |
673 | |
863 | |
674 | =cut |
864 | =cut |
… | |
… | |
717 | |
907 | |
718 | # evaluate user expression |
908 | # evaluate user expression |
719 | |
909 | |
720 | my $img = eval { $self->{expr}->() }; |
910 | my $img = eval { $self->{expr}->() }; |
721 | warn $@ if $@;#d# |
911 | warn $@ if $@;#d# |
722 | die if !UNIVERSAL::isa $img, "urxvt::img"; |
912 | die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img"; |
723 | |
913 | |
724 | $state->{size_sensitive} = 1 |
914 | # if the expression is sensitive to external events, prepare reevaluation then |
|
|
915 | |
|
|
916 | my $again = delete $state->{again}; |
|
|
917 | |
|
|
918 | $again->{size} = 1 |
725 | if $img->repeat_mode != urxvt::RepeatNormal; |
919 | if $img->repeat_mode != urxvt::RepeatNormal; |
726 | |
920 | |
727 | # if the expression is sensitive to external events, prepare reevaluation then |
|
|
728 | |
|
|
729 | my $repeat; |
|
|
730 | |
|
|
731 | if (my $again = $state->{again}) { |
921 | if (my $again = $again->{time}) { |
732 | $repeat = 1; |
|
|
733 | my $self = $self; |
922 | my $self = $self; |
734 | $state->{timer} = $again == $old->{again} |
923 | $state->{timer} = $again == $old->{again} |
735 | ? $old->{timer} |
924 | ? $old->{timer} |
736 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
925 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
737 | ++$self->{counter}; |
926 | ++$self->{counter}; |
738 | $self->recalculate |
927 | $self->recalculate |
739 | }); |
928 | }); |
740 | } |
929 | } |
741 | |
930 | |
742 | if (delete $state->{position_sensitive}) { |
931 | if ($again->{position}) { |
743 | $repeat = 1; |
|
|
744 | $self->enable (position_change => sub { $_[0]->recalculate }); |
932 | $self->enable (position_change => sub { $_[0]->recalculate }); |
745 | } else { |
933 | } else { |
746 | $self->disable ("position_change"); |
934 | $self->disable ("position_change"); |
747 | } |
935 | } |
748 | |
936 | |
749 | if (delete $state->{size_sensitive}) { |
937 | if ($again->{size}) { |
750 | $repeat = 1; |
|
|
751 | $self->enable (size_change => sub { $_[0]->recalculate }); |
938 | $self->enable (size_change => sub { $_[0]->recalculate }); |
752 | } else { |
939 | } else { |
753 | $self->disable ("size_change"); |
940 | $self->disable ("size_change"); |
754 | } |
941 | } |
755 | |
942 | |
756 | if (delete $state->{rootpmap_sensitive}) { |
943 | if ($again->{rootpmap}) { |
757 | $repeat = 1; |
|
|
758 | $self->enable (rootpmap_change => sub { $_[0]->recalculate }); |
944 | $self->enable (rootpmap_change => sub { |
|
|
945 | delete $_[0]{once_cache}; # this will override once-block values from |
|
|
946 | $_[0]->recalculate; |
|
|
947 | }); |
759 | } else { |
948 | } else { |
760 | $self->disable ("rootpmap_change"); |
949 | $self->disable ("rootpmap_change"); |
761 | } |
950 | } |
762 | |
951 | |
763 | # clear stuff we no longer need |
952 | # clear stuff we no longer need |
764 | |
953 | |
765 | %$old = (); |
954 | %$old = (); |
766 | |
955 | |
767 | unless ($repeat) { |
956 | unless (%$again) { |
768 | delete $self->{state}; |
957 | delete $self->{state}; |
769 | delete $self->{expr}; |
958 | delete $self->{expr}; |
770 | } |
959 | } |
771 | |
960 | |
772 | # set background pixmap |
961 | # set background pixmap |
… | |
… | |
777 | } |
966 | } |
778 | |
967 | |
779 | sub on_start { |
968 | sub on_start { |
780 | my ($self) = @_; |
969 | my ($self) = @_; |
781 | |
970 | |
782 | my $expr = $self->x_resource ("background.expr") |
971 | my $expr = $self->x_resource ("%.expr") |
783 | or return; |
972 | or return; |
784 | |
973 | |
|
|
974 | $self->has_render |
|
|
975 | or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n"; |
|
|
976 | |
785 | $self->set_expr (parse_expr $expr); |
977 | $self->set_expr (parse_expr $expr); |
786 | $self->{border} = $self->x_resource_boolean ("background.border"); |
978 | $self->{border} = $self->x_resource_boolean ("%.border"); |
|
|
979 | |
|
|
980 | $MIN_INTERVAL = $self->x_resource ("%.interval"); |
787 | |
981 | |
788 | () |
982 | () |
789 | } |
983 | } |
790 | |
984 | |