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 | #:META:X_RESOURCE:%.interval:seconds:minimum time between updates |
5 | #:META:X_RESOURCE:%.interval:seconds:minimum time between updates |
6 | |
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7 | #TODO: once, rootalign |
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8 | |
6 | |
9 | =head1 NAME |
7 | =head1 NAME |
10 | |
8 | |
11 | background - manage terminal background |
9 | background - manage terminal background |
12 | |
10 | |
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59 | |
57 | |
60 | 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 |
61 | 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 |
62 | 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 |
63 | example. That ensures that the picture always fills the terminal, even |
61 | example. That ensures that the picture always fills the terminal, even |
64 | after it's size changes. |
62 | after its size changes. |
65 | |
63 | |
66 | =head2 EXPRESSIONS |
64 | =head2 EXPRESSIONS |
67 | |
65 | |
68 | Expressions are normal Perl expressions, in fact, they are Perl blocks - |
66 | Expressions are normal Perl expressions, in fact, they are Perl blocks - |
69 | which means you could use multiple lines and statements: |
67 | which means you could use multiple lines and statements: |
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73 | return scale load "$HOME/weekday.png"; |
71 | return scale load "$HOME/weekday.png"; |
74 | } else { |
72 | } else { |
75 | return scale load "$HOME/sunday.png"; |
73 | return scale load "$HOME/sunday.png"; |
76 | } |
74 | } |
77 | |
75 | |
78 | 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 |
79 | background on Sundays, and F<weekday.png> on all other days. |
77 | background on Sundays, and F<weekday.png> on all other days. |
80 | |
78 | |
81 | Fortunately, we expect that most expressions will be much simpler, with |
79 | Fortunately, we expect that most expressions will be much simpler, with |
82 | little Perl knowledge needed. |
80 | little Perl knowledge needed. |
83 | |
81 | |
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117 | horizontal and vertical dimensions. For example, this halves the image |
115 | horizontal and vertical dimensions. For example, this halves the image |
118 | width and doubles the image height: |
116 | width and doubles the image height: |
119 | |
117 | |
120 | scale 0.5, 2, load "$HOME/mypic.png" |
118 | scale 0.5, 2, load "$HOME/mypic.png" |
121 | |
119 | |
122 | 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 |
123 | 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: |
124 | |
122 | |
125 | tile load "$HOME/mypic.png" |
123 | tile load "$HOME/mypic.png" |
126 | |
124 | |
127 | 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 |
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153 | 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 |
154 | 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 |
155 | image, it will forget about the first one. |
153 | image, it will forget about the first one. |
156 | |
154 | |
157 | 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 |
158 | memory, or comserve memory by loading images more often. |
156 | memory, or conserve memory by loading images more often. |
159 | |
157 | |
160 | 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 |
161 | this: |
159 | this: |
162 | |
160 | |
163 | my $img1 = load "img1.png"; |
161 | my $img1 = load "img1.png"; |
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193 | Specifying this flag changes the behaviour, so that the image only |
191 | Specifying this flag changes the behaviour, so that the image only |
194 | replaces the background of the character area. |
192 | replaces the background of the character area. |
195 | |
193 | |
196 | =item --background-interval seconds |
194 | =item --background-interval seconds |
197 | |
195 | |
198 | Since some operations in the underlying XRender extension can effetively |
196 | Since some operations in the underlying XRender extension can effectively |
199 | freeze your X-server for prolonged time, this extension enforces a minimum |
197 | freeze your X-server for prolonged time, this extension enforces a minimum |
200 | time between updates, which is normally about 0.1 seconds. |
198 | time between updates, which is normally about 0.1 seconds. |
201 | |
199 | |
202 | If you want to do updates more often, you can decrease this safety |
200 | If you want to do updates more often, you can decrease this safety |
203 | interval with this switch. |
201 | interval with this switch. |
204 | |
202 | |
205 | =back |
203 | =back |
206 | |
204 | |
207 | =cut |
205 | =cut |
208 | |
206 | |
209 | our %_IMGCACHE; |
207 | our %_IMG_CACHE; |
210 | our $HOME; |
208 | our $HOME; |
211 | our ($self, $old, $new); |
209 | our ($self, $old, $new); |
212 | our ($x, $y, $w, $h); |
210 | our ($x, $y, $w, $h); |
213 | |
211 | |
214 | # enforce at least this interval between updates |
212 | # enforce at least this interval between updates |
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230 | =item load $path |
228 | =item load $path |
231 | |
229 | |
232 | Loads the image at the given C<$path>. The image is set to plane tiling |
230 | Loads the image at the given C<$path>. The image is set to plane tiling |
233 | mode. |
231 | mode. |
234 | |
232 | |
235 | 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>). |
236 | |
235 | |
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236 | =item load_uc $path |
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237 | |
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238 | Load uncached - same as load, but does not cache the image. This function |
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239 | is most useufl if you want to optimise a background expression in some |
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240 | way. |
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241 | |
237 | =cut |
242 | =cut |
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243 | |
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244 | sub load_uc($) { |
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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 | $img |
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251 | } |
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252 | } |
238 | |
253 | |
239 | sub load($) { |
254 | sub load($) { |
240 | my ($path) = @_; |
255 | my ($path) = @_; |
241 | |
256 | |
242 | $new->{load}{$path} = $old->{load}{$path} || $self->new_img_from_file ($path); |
257 | $new->{load}{$path} = $old->{load}{$path} || load_uc $path; |
243 | } |
258 | } |
244 | |
259 | |
245 | =item root |
260 | =item root |
246 | |
261 | |
247 | Returns the root window pixmap, that is, hopefully, the background image |
262 | Returns the root window pixmap, that is, hopefully, the background image |
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251 | reevaluated when the bg image changes. |
266 | reevaluated when the bg image changes. |
252 | |
267 | |
253 | =cut |
268 | =cut |
254 | |
269 | |
255 | sub root() { |
270 | sub root() { |
256 | $new->{rootpmap_sensitive} = 1; |
271 | $new->{again}{rootpmap} = 1; |
257 | die "root op not supported, exg, we need you"; |
272 | $self->new_img_from_root |
258 | } |
273 | } |
259 | |
274 | |
260 | =item solid $colour |
275 | =item solid $colour |
261 | |
276 | |
262 | =item solid $width, $height, $colour |
277 | =item solid $width, $height, $colour |
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286 | |
301 | |
287 | sub clone($) { |
302 | sub clone($) { |
288 | $_[0]->clone |
303 | $_[0]->clone |
289 | } |
304 | } |
290 | |
305 | |
291 | =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 = $self->new_img ($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->blend (1., $_) |
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338 | for @_; |
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339 | |
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340 | $base |
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341 | } |
292 | |
342 | |
293 | =head2 TILING MODES |
343 | =head2 TILING MODES |
294 | |
344 | |
295 | 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 |
296 | 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. |
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326 | 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 |
327 | image over another image or the background colour while leaving all |
377 | image over another image or the background colour while leaving all |
328 | background pixels outside the image unchanged. |
378 | background pixels outside the image unchanged. |
329 | |
379 | |
330 | 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 |
331 | 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 |
332 | in alpha mode, else background colour). |
382 | in alpha mode, else background colour). |
333 | |
383 | |
334 | pad load "mybg.png" |
384 | pad load "mybg.png" |
335 | |
385 | |
336 | =item extend $img |
386 | =item extend $img |
337 | |
387 | |
338 | 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 |
339 | 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 |
340 | 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 |
341 | same values as the pixels near the edge. |
391 | same values as the pixels near the edge. |
342 | |
392 | |
343 | Example: just for curiosity, how does this pixel extension stuff work? |
393 | Example: just for curiosity, how does this pixel extension stuff work? |
344 | |
394 | |
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411 | the window size to conserve memory. |
461 | the window size to conserve memory. |
412 | |
462 | |
413 | Example: take the screen background, clip it to the window size, blur it a |
463 | Example: take the screen background, clip it to the window size, blur it a |
414 | bit, align it to the window position and use it as background. |
464 | bit, align it to the window position and use it as background. |
415 | |
465 | |
416 | clip move -TX, -TY, blur 5, root |
466 | clip move -TX, -TY, once { blur 5, root } |
417 | |
467 | |
418 | =cut |
468 | =cut |
419 | |
469 | |
420 | sub TX() { $new->{position_sensitive} = 1; $x } |
470 | sub TX() { $new->{again}{position} = 1; $x } |
421 | sub TY() { $new->{position_sensitive} = 1; $y } |
471 | sub TY() { $new->{again}{position} = 1; $y } |
422 | sub TW() { $new->{size_sensitive} = 1; $w } |
472 | sub TW() { $new->{again}{size} = 1; $w } |
423 | sub TH() { $new->{size_sensitive} = 1; $h } |
473 | sub TH() { $new->{again}{size} = 1; $h } |
424 | |
474 | |
425 | =item now |
475 | =item now |
426 | |
476 | |
427 | Returns the current time as (fractional) seconds since the epoch. |
477 | Returns the current time as (fractional) seconds since the epoch. |
428 | |
478 | |
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435 | C<$seconds> seconds. |
485 | C<$seconds> seconds. |
436 | |
486 | |
437 | Example: load some image and rotate it according to the time of day (as if it were |
487 | Example: load some image and rotate it according to the time of day (as if it were |
438 | the hour pointer of a clock). Update this image every minute. |
488 | the hour pointer of a clock). Update this image every minute. |
439 | |
489 | |
440 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
490 | again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
441 | |
491 | |
442 | =item counter $seconds |
492 | =item counter $seconds |
443 | |
493 | |
444 | Like C<again>, but also returns an increasing counter value, starting at |
494 | Like C<again>, but also returns an increasing counter value, starting at |
445 | 0, which might be useful for some simple animation effects. |
495 | 0, which might be useful for some simple animation effects. |
… | |
… | |
447 | =cut |
497 | =cut |
448 | |
498 | |
449 | sub now() { urxvt::NOW } |
499 | sub now() { urxvt::NOW } |
450 | |
500 | |
451 | sub again($) { |
501 | sub again($) { |
452 | $new->{again} = $_[0]; |
502 | $new->{again}{time} = $_[0]; |
453 | } |
503 | } |
454 | |
504 | |
455 | sub counter($) { |
505 | sub counter($) { |
456 | $new->{again} = $_[0]; |
506 | $new->{again}{time} = $_[0]; |
457 | $self->{counter} + 0 |
507 | $self->{counter} + 0 |
458 | } |
508 | } |
459 | |
509 | |
460 | =back |
510 | =back |
461 | |
511 | |
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632 | |
682 | |
633 | sub rootalign($) { |
683 | sub rootalign($) { |
634 | move -TX, -TY, $_[0] |
684 | move -TX, -TY, $_[0] |
635 | } |
685 | } |
636 | |
686 | |
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687 | =item rotate $center_x, $center_y, $degrees |
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688 | |
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689 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
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690 | pointer at C<$center_x> and C<$center_y> (specified as factor of image |
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691 | width/height). |
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692 | |
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693 | #TODO# new width, height, maybe more operators? |
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694 | |
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695 | Example: rotate the image by 90 degrees |
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696 | |
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697 | =cut |
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698 | |
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699 | sub rotate($$$$) { |
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700 | my $img = pop; |
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701 | $img->rotate ( |
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702 | $_[0] * $img->w, |
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703 | $_[1] * $img->h, |
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704 | $_[2] * (3.14159265 / 180), |
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705 | ) |
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706 | } |
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707 | |
637 | =back |
708 | =back |
638 | |
709 | |
639 | =head2 COLOUR MODIFICATIONS |
710 | =head2 COLOUR MODIFICATIONS |
640 | |
711 | |
641 | The following operators change the pixels of the image. |
712 | The following operators change the pixels of the image. |
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… | |
675 | |
746 | |
676 | Values less than 0 reduce brightness, while values larger than 0 increase |
747 | Values less than 0 reduce brightness, while values larger than 0 increase |
677 | it. Useful range is from -1 to 1 - the former results in a black, the |
748 | it. Useful range is from -1 to 1 - the former results in a black, the |
678 | latter in a white picture. |
749 | latter in a white picture. |
679 | |
750 | |
680 | Due to idiosynchrasies in the underlying XRender extension, biases less |
751 | Due to idiosyncrasies in the underlying XRender extension, biases less |
681 | than zero can be I<very> slow. |
752 | than zero can be I<very> slow. |
682 | |
753 | |
683 | =cut |
754 | =cut |
684 | |
755 | |
685 | sub contrast($$;$$;$) { |
756 | sub contrast($$;$$;$) { |
… | |
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723 | sub blur($$;$) { |
794 | sub blur($$;$) { |
724 | my $img = pop; |
795 | my $img = pop; |
725 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
796 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
726 | } |
797 | } |
727 | |
798 | |
728 | =item rotate $new_width, $new_height, $center_x, $center_y, $degrees |
799 | =back |
729 | |
800 | |
730 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
801 | =head2 OTHER STUFF |
731 | pointer at C<$center_x> and C<$center_y> (specified as factor of image |
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732 | width/height), generating a new image with width C<$new_width> and height |
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733 | C<$new_height>. |
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734 | |
802 | |
735 | #TODO# new width, height, maybe more operators? |
803 | Anything that didn't fit any of the other categories, even after applying |
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804 | force and closing our eyes. |
736 | |
805 | |
737 | Example: rotate the image by 90 degrees |
806 | =over 4 |
738 | |
807 | |
739 | =cut |
808 | =item once { ... } |
740 | |
809 | |
741 | sub rotate($$$$$$) { |
810 | This function takes a code block as argument, that is, one or more |
742 | my $img = pop; |
811 | statements enclosed by braces. |
743 | $img->rotate ( |
812 | |
744 | $_[0], |
813 | The trick is that this code block is only evaluated once - future calls |
745 | $_[1], |
814 | will simply return the original image (yes, it should only be used with |
746 | $_[2] * $img->w, |
815 | images). |
747 | $_[3] * $img->h, |
816 | |
748 | $_[4] * (3.14159265 / 180), |
817 | This can be extremely useful to avoid redoign the same slow operations |
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818 | again and again- for example, if your background expression takes the root |
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819 | background, blurs it and then root-aligns it it would have to blur the |
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820 | root background on every window move or resize. |
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821 | |
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822 | Putting the blur into a C<once> block will make sure the blur is only done |
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823 | once: |
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824 | |
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825 | rootlign once { blur 10, root } |
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826 | |
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827 | This leaves the question of how to force reevaluation of the block, in |
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828 | case the root background changes: Right now, all once blocks forget that |
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829 | they ahve been executed before each time the root background changes (if |
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830 | the expression is sensitive to that) or when C<once_again> is called. |
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831 | |
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832 | =item once_again |
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833 | |
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834 | Resets all C<once> block as if they had never been called, i.e. on the |
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835 | next call they will be reevaluated again. |
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836 | |
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837 | =cut |
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838 | |
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839 | sub once(&) { |
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840 | my $once = $self->{once_cache}{$_[0]+0} ||= do { |
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841 | local $new->{again}; |
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842 | my @res = $_[0](); |
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843 | [$new->{again}, \@res] |
749 | ) |
844 | }; |
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845 | |
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846 | $new->{again} = { |
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847 | %{ $new->{again} }, |
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848 | %{ $once->[0] } |
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849 | }; |
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850 | |
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851 | # in scalar context we always return the first original result, which |
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852 | # is not quite how perl works. |
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853 | wantarray |
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854 | ? @{ $once->[1] } |
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855 | : $once->[1][0] |
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856 | } |
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857 | |
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858 | sub once_again() { |
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859 | delete $self->{once_cache}; |
750 | } |
860 | } |
751 | |
861 | |
752 | =back |
862 | =back |
753 | |
863 | |
754 | =cut |
864 | =cut |
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… | |
799 | |
909 | |
800 | my $img = eval { $self->{expr}->() }; |
910 | my $img = eval { $self->{expr}->() }; |
801 | warn $@ if $@;#d# |
911 | warn $@ if $@;#d# |
802 | die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img"; |
912 | die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img"; |
803 | |
913 | |
804 | $state->{size_sensitive} = 1 |
914 | # if the expression is sensitive to external events, prepare reevaluation then |
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915 | |
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916 | my $again = delete $state->{again}; |
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917 | |
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918 | $again->{size} = 1 |
805 | if $img->repeat_mode != urxvt::RepeatNormal; |
919 | if $img->repeat_mode != urxvt::RepeatNormal; |
806 | |
920 | |
807 | # if the expression is sensitive to external events, prepare reevaluation then |
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808 | |
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809 | my $repeat; |
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810 | |
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811 | if (my $again = $state->{again}) { |
921 | if (my $again = $again->{time}) { |
812 | $repeat = 1; |
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|
813 | my $self = $self; |
922 | my $self = $self; |
814 | $state->{timer} = $again == $old->{again} |
923 | $state->{timer} = $again == $old->{again} |
815 | ? $old->{timer} |
924 | ? $old->{timer} |
816 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
925 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
817 | ++$self->{counter}; |
926 | ++$self->{counter}; |
818 | $self->recalculate |
927 | $self->recalculate |
819 | }); |
928 | }); |
820 | } |
929 | } |
821 | |
930 | |
822 | if (delete $state->{position_sensitive}) { |
931 | if ($again->{position}) { |
823 | $repeat = 1; |
|
|
824 | $self->enable (position_change => sub { $_[0]->recalculate }); |
932 | $self->enable (position_change => sub { $_[0]->recalculate }); |
825 | } else { |
933 | } else { |
826 | $self->disable ("position_change"); |
934 | $self->disable ("position_change"); |
827 | } |
935 | } |
828 | |
936 | |
829 | if (delete $state->{size_sensitive}) { |
937 | if ($again->{size}) { |
830 | $repeat = 1; |
|
|
831 | $self->enable (size_change => sub { $_[0]->recalculate }); |
938 | $self->enable (size_change => sub { $_[0]->recalculate }); |
832 | } else { |
939 | } else { |
833 | $self->disable ("size_change"); |
940 | $self->disable ("size_change"); |
834 | } |
941 | } |
835 | |
942 | |
836 | if (delete $state->{rootpmap_sensitive}) { |
943 | if ($again->{rootpmap}) { |
837 | $repeat = 1; |
|
|
838 | $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 | }); |
839 | } else { |
948 | } else { |
840 | $self->disable ("rootpmap_change"); |
949 | $self->disable ("rootpmap_change"); |
841 | } |
950 | } |
842 | |
951 | |
843 | # clear stuff we no longer need |
952 | # clear stuff we no longer need |
844 | |
953 | |
845 | %$old = (); |
954 | %$old = (); |
846 | |
955 | |
847 | unless ($repeat) { |
956 | unless (%$again) { |
848 | delete $self->{state}; |
957 | delete $self->{state}; |
849 | delete $self->{expr}; |
958 | delete $self->{expr}; |
850 | } |
959 | } |
851 | |
960 | |
852 | # set background pixmap |
961 | # set background pixmap |