… | |
… | |
26 | to be as simple as possible. |
26 | to be as simple as possible. |
27 | |
27 | |
28 | For example, to load an image and scale it to the window size, you would |
28 | For example, to load an image and scale it to the window size, you would |
29 | use: |
29 | use: |
30 | |
30 | |
31 | urxvt --background-expr 'scale load "/path/to/mybg.png"' |
31 | urxvt --background-expr 'scale keep { load "/path/to/mybg.png" }' |
32 | |
32 | |
33 | Or specified as a X resource: |
33 | Or specified as a X resource: |
34 | |
34 | |
35 | URxvt.background-expr: scale load "/path/to/mybg.png" |
35 | URxvt.background-expr: scale keep { load "/path/to/mybg.png" } |
36 | |
36 | |
37 | =head1 THEORY OF OPERATION |
37 | =head1 THEORY OF OPERATION |
38 | |
38 | |
39 | 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 |
40 | 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 |
… | |
… | |
53 | If any of the parameters that the expression relies on changes (when the |
53 | If any of the parameters that the expression relies on changes (when the |
54 | window is moved or resized, its position or size changes; when the root |
54 | window is moved or resized, its position or size changes; when the root |
55 | pixmap is replaced by another one the root background changes; or when the |
55 | pixmap is replaced by another one the root background changes; or when the |
56 | timer elapses), then the expression will be evaluated again. |
56 | timer elapses), then the expression will be evaluated again. |
57 | |
57 | |
58 | For example, an expression such as C<scale load "$HOME/mybg.png"> scales the |
58 | For example, an expression such as C<scale keep { load "$HOME/mybg.png" |
59 | image to the window size, so it relies on the window size and will |
59 | }> scales the image to the window size, so it relies on the window size |
60 | be reevaluated each time it is changed, but not when it moves for |
60 | and will 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 its 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: |
68 | |
68 | |
|
|
69 | scale keep { |
69 | again 3600; |
70 | again 3600; |
70 | if (localtime now)[6]) { |
71 | if (localtime now)[6]) { |
71 | return scale load "$HOME/weekday.png"; |
72 | return load "$HOME/weekday.png"; |
72 | } else { |
73 | } else { |
73 | return scale load "$HOME/sunday.png"; |
74 | return load "$HOME/sunday.png"; |
|
|
75 | } |
74 | } |
76 | } |
75 | |
77 | |
76 | This expression gets evaluated once per hour. It will set F<sunday.png> as |
78 | 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. |
79 | background on Sundays, and F<weekday.png> on all other days. |
78 | |
80 | |
79 | Fortunately, we expect that most expressions will be much simpler, with |
81 | Fortunately, we expect that most expressions will be much simpler, with |
80 | little Perl knowledge needed. |
82 | little Perl knowledge needed. |
81 | |
83 | |
… | |
… | |
115 | horizontal and vertical dimensions. For example, this halves the image |
117 | horizontal and vertical dimensions. For example, this halves the image |
116 | width and doubles the image height: |
118 | width and doubles the image height: |
117 | |
119 | |
118 | scale 0.5, 2, load "$HOME/mypic.png" |
120 | scale 0.5, 2, load "$HOME/mypic.png" |
119 | |
121 | |
120 | Other effects than scaling are also readily available, for example, you can |
122 | IF you try out these expressions, you might suffer from sluggishness, |
121 | tile the image to fill the whole window, instead of resizing it: |
123 | because each time the terminal is resized, it again loads the PNG image |
|
|
124 | and scales it. Scaling is usually fast, but loading the image can be quite |
|
|
125 | time consuming. This is where C<keep> comes in handy: |
122 | |
126 | |
|
|
127 | scale 0.5, 2, keep { load "$HOME/mypic.png" } |
|
|
128 | |
|
|
129 | The C<keep> operator executes all the statements inside the braces only |
|
|
130 | once, or when it thinks the outcome might change. In other cases it |
|
|
131 | returns the last value computed by the brace block. |
|
|
132 | |
|
|
133 | This means that the C<load> is only executed once, which makes it much |
|
|
134 | faster, but also means that more memory is being used, because the loaded |
|
|
135 | image must be kept in memory at all times. In this expression, the |
|
|
136 | trade-off is likely worth it. |
|
|
137 | |
|
|
138 | But back to effects: Other effects than scaling are also readily |
|
|
139 | available, for example, you can tile the image to fill the whole window, |
|
|
140 | instead of resizing it: |
|
|
141 | |
123 | tile load "$HOME/mypic.png" |
142 | tile keep { load "$HOME/mypic.png" } |
124 | |
143 | |
125 | In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator |
144 | In fact, images returned by C<load> are in C<tile> mode by default, so the |
126 | is kind of superfluous. |
145 | C<tile> operator is kind of superfluous. |
127 | |
146 | |
128 | Another common effect is to mirror the image, so that the same edges touch: |
147 | Another common effect is to mirror the image, so that the same edges |
|
|
148 | touch: |
129 | |
149 | |
130 | mirror load "$HOME/mypic.png" |
150 | mirror keep { load "$HOME/mypic.png" } |
131 | |
151 | |
132 | This is also a typical background expression: |
152 | Another common background expression is: |
133 | |
153 | |
134 | rootalign root |
154 | rootalign root |
135 | |
155 | |
136 | It first takes a snapshot of the screen background image, and then |
156 | This one first takes a snapshot of the screen background image, and then |
137 | moves it to the upper left corner of the screen - the result is |
157 | moves it to the upper left corner of the screen (as opposed to the upper |
138 | pseudo-transparency, as the image seems to be static while the window is |
158 | left corner of the terminal window)- the result is pseudo-transparency: |
139 | moved around. |
159 | the image seems to be static while the window is moved around. |
140 | |
160 | |
141 | =head2 CYCLES AND CACHING |
161 | =head2 CACHING AND SENSITIVITY |
142 | |
162 | |
143 | As has been mentioned before, the expression might be evaluated multiple |
163 | Since some operations (such as C<load> and C<blur>) can take a long time, |
144 | times. Each time the expression is reevaluated, a new cycle is said to |
164 | caching results can be very important for a smooth operation. Caching can |
145 | have begun. Many operators cache their results till the next cycle. |
165 | also be useful to reduce memory usage, though, for example, when an image |
|
|
166 | is cached by C<load>, it could be shared by multiple terminal windows |
|
|
167 | running inside urxvtd. |
146 | |
168 | |
147 | For example, the C<load> operator keeps a copy of the image. If it is |
169 | =head3 C<keep { ... }> caching |
148 | asked to load the same image on the next cycle it will not load it again, |
|
|
149 | but return the cached copy. |
|
|
150 | |
170 | |
151 | This only works for one cycle though, so as long as you load the same |
171 | The most important way to cache expensive operations is to use C<keep { |
152 | image every time, it will always be cached, but when you load a different |
172 | ... }>. The C<keep> operator takes a block of multiple statements enclosed |
153 | image, it will forget about the first one. |
173 | by C<{}> and keeps the return value in memory. |
154 | |
174 | |
155 | This allows you to either speed things up by keeping multiple images in |
175 | An expression can be "sensitive" to various external events, such as |
156 | memory, or conserve memory by loading images more often. |
176 | scaling or moving the window, root background changes and timers. Simply |
|
|
177 | using an expression (such as C<scale> without parameters) that depend on |
|
|
178 | certain changing values (called "variables"), or using those variables |
|
|
179 | directly, will make an expression sensitive to these events - for example, |
|
|
180 | using C<scale> or C<TW> will make the expression sensitive to the terminal |
|
|
181 | size, and thus to resizing events. |
157 | |
182 | |
158 | For example, you can keep two images in memory and use a random one like |
183 | When such an event happens, C<keep> will automatically trigger a |
159 | this: |
184 | reevaluation of the whole expression with the new value of the expression. |
160 | |
185 | |
161 | my $img1 = load "img1.png"; |
186 | C<keep> is most useful for expensive operations, such as C<blur>: |
162 | my $img2 = load "img2.png"; |
|
|
163 | (0.5 > rand) ? $img1 : $img2 |
|
|
164 | |
187 | |
165 | Since both images are "loaded" every time the expression is evaluated, |
188 | rootalign once { blur 20, root } |
166 | they are always kept in memory. Contrast this version: |
|
|
167 | |
189 | |
168 | my $path1 = "img1.png"; |
190 | This makes a blurred copy of the root background once, and on subsequent |
169 | my $path2 = "img2.png"; |
191 | calls, just root-aligns it. Since C<blur> is usually quite slow and |
170 | load ((0.5 > rand) ? $path1 : $path2) |
192 | C<rootalign> is quite fast, this trades extra memory (for the cached |
|
|
193 | blurred pixmap) with speed (blur only needs to be redone when root |
|
|
194 | changes). |
171 | |
195 | |
172 | Here, a path is selected randomly, and load is only called for one image, |
196 | =head3 C<load> caching |
173 | so keeps only one image in memory. If, on the next evaluation, luck |
197 | |
174 | decides to use the other path, then it will have to load that image again. |
198 | The C<load> operator itself does not keep images in memory, but as long as |
|
|
199 | the image is still in memory, C<load> will use the in-memory image instead |
|
|
200 | of loading it freshly from disk. |
|
|
201 | |
|
|
202 | That means that this expression: |
|
|
203 | |
|
|
204 | keep { load "$HOME/path..." } |
|
|
205 | |
|
|
206 | Not only caches the image in memory, other terminal instances that try to |
|
|
207 | C<load> it can reuse that in-memory copy. |
175 | |
208 | |
176 | =head1 REFERENCE |
209 | =head1 REFERENCE |
177 | |
210 | |
178 | =head2 COMMAND LINE SWITCHES |
211 | =head2 COMMAND LINE SWITCHES |
179 | |
212 | |
… | |
… | |
203 | =back |
236 | =back |
204 | |
237 | |
205 | =cut |
238 | =cut |
206 | |
239 | |
207 | our %_IMG_CACHE; |
240 | our %_IMG_CACHE; |
208 | our %_ONCE_CACHE; |
|
|
209 | our $HOME; |
241 | our $HOME; |
210 | our ($self, $old, $new); |
242 | our ($self, $frame); |
211 | our ($x, $y, $w, $h); |
243 | our ($x, $y, $w, $h); |
212 | |
244 | |
213 | # enforce at least this interval between updates |
245 | # enforce at least this interval between updates |
214 | our $MIN_INTERVAL = 6/59.951; |
246 | our $MIN_INTERVAL = 6/59.951; |
215 | |
247 | |
216 | { |
248 | { |
217 | package urxvt::bgdsl; # background language |
249 | package urxvt::bgdsl; # background language |
|
|
250 | |
|
|
251 | sub FR_PARENT() { 0 } # parent frame, if any - must be #0 |
|
|
252 | sub FR_CACHE () { 1 } # cached values |
|
|
253 | sub FR_AGAIN () { 2 } # what this expr is sensitive to |
|
|
254 | sub FR_STATE () { 3 } # watchers etc. |
218 | |
255 | |
219 | use List::Util qw(min max sum shuffle); |
256 | use List::Util qw(min max sum shuffle); |
220 | |
257 | |
221 | =head2 PROVIDERS/GENERATORS |
258 | =head2 PROVIDERS/GENERATORS |
222 | |
259 | |
… | |
… | |
229 | =item load $path |
266 | =item load $path |
230 | |
267 | |
231 | Loads the image at the given C<$path>. The image is set to plane tiling |
268 | Loads the image at the given C<$path>. The image is set to plane tiling |
232 | mode. |
269 | mode. |
233 | |
270 | |
234 | Loaded images will be cached for one cycle. |
271 | If the image is already in memory (e.g. because another terminal instance |
|
|
272 | uses it), then the in-memory copy us returned instead. |
235 | |
273 | |
|
|
274 | =item load_uc $path |
|
|
275 | |
|
|
276 | Load uncached - same as load, but does not cache the image, which means it |
|
|
277 | is I<always> loaded from the filesystem again. |
|
|
278 | |
236 | =cut |
279 | =cut |
|
|
280 | |
|
|
281 | sub load_uc($) { |
|
|
282 | $self->new_img_from_file ($path) |
|
|
283 | } |
237 | |
284 | |
238 | sub load($) { |
285 | sub load($) { |
239 | my ($path) = @_; |
286 | my ($path) = @_; |
240 | |
287 | |
241 | $new->{load}{$path} = $old->{load}{$path} || $self->new_img_from_file ($path); |
288 | $_IMG_CACHE{$path} || do { |
|
|
289 | my $img = load_uc $path; |
|
|
290 | Scalar::Util::weaken ($_IMG_CACHE{$path} = $img); |
|
|
291 | $img |
|
|
292 | } |
242 | } |
293 | } |
243 | |
294 | |
244 | =item root |
295 | =item root |
245 | |
296 | |
246 | Returns the root window pixmap, that is, hopefully, the background image |
297 | Returns the root window pixmap, that is, hopefully, the background image |
247 | of your screen. The image is set to extend mode. |
298 | of your screen. |
248 | |
299 | |
249 | This function makes your expression root sensitive, that means it will be |
300 | This function makes your expression root sensitive, that means it will be |
250 | reevaluated when the bg image changes. |
301 | reevaluated when the bg image changes. |
251 | |
302 | |
252 | =cut |
303 | =cut |
253 | |
304 | |
254 | sub root() { |
305 | sub root() { |
255 | $new->{rootpmap_sensitive} = 1; |
306 | $frame->[FR_AGAIN]{rootpmap} = 1; |
256 | $self->new_img_from_root |
307 | $self->new_img_from_root |
257 | } |
308 | } |
258 | |
309 | |
259 | =item solid $colour |
310 | =item solid $colour |
260 | |
311 | |
… | |
… | |
269 | =cut |
320 | =cut |
270 | |
321 | |
271 | sub solid($;$$) { |
322 | sub solid($;$$) { |
272 | my $colour = pop; |
323 | my $colour = pop; |
273 | |
324 | |
274 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
325 | my $img = $self->new_img (urxvt::PictStandardARGB32, 0, 0, $_[0] || 1, $_[1] || 1); |
275 | $img->fill ($colour); |
326 | $img->fill ($colour); |
276 | $img |
327 | $img |
277 | } |
328 | } |
278 | |
329 | |
279 | =item clone $img |
330 | =item clone $img |
… | |
… | |
283 | |
334 | |
284 | =cut |
335 | =cut |
285 | |
336 | |
286 | sub clone($) { |
337 | sub clone($) { |
287 | $_[0]->clone |
338 | $_[0]->clone |
|
|
339 | } |
|
|
340 | |
|
|
341 | =item merge $img ... |
|
|
342 | |
|
|
343 | Takes any number of images and merges them together, creating a single |
|
|
344 | image containing them all. The tiling mode of the first image is used as |
|
|
345 | the tiling mode of the resulting image. |
|
|
346 | |
|
|
347 | This function is called automatically when an expression returns multiple |
|
|
348 | images. |
|
|
349 | |
|
|
350 | =cut |
|
|
351 | |
|
|
352 | sub merge(@) { |
|
|
353 | return $_[0] unless $#_; |
|
|
354 | |
|
|
355 | # rather annoyingly clumsy, but optimisation is for another time |
|
|
356 | |
|
|
357 | my $x0 = +1e9; |
|
|
358 | my $y0 = +1e9; |
|
|
359 | my $x1 = -1e9; |
|
|
360 | my $y1 = -1e9; |
|
|
361 | |
|
|
362 | for (@_) { |
|
|
363 | my ($x, $y, $w, $h) = $_->geometry; |
|
|
364 | |
|
|
365 | $x0 = $x if $x0 > $x; |
|
|
366 | $y0 = $y if $y0 > $y; |
|
|
367 | |
|
|
368 | $x += $w; |
|
|
369 | $y += $h; |
|
|
370 | |
|
|
371 | $x1 = $x if $x1 < $x; |
|
|
372 | $y1 = $y if $y1 < $y; |
|
|
373 | } |
|
|
374 | |
|
|
375 | my $base = $self->new_img (urxvt::PictStandardARGB32, $x0, $y0, $x1 - $x0, $y1 - $y0); |
|
|
376 | $base->repeat_mode ($_[0]->repeat_mode); |
|
|
377 | $base->fill ([0, 0, 0, 0]); |
|
|
378 | |
|
|
379 | $base->draw ($_) |
|
|
380 | for @_; |
|
|
381 | |
|
|
382 | $base |
288 | } |
383 | } |
289 | |
384 | |
290 | =head2 TILING MODES |
385 | =head2 TILING MODES |
291 | |
386 | |
292 | The following operators modify the tiling mode of an image, that is, the |
387 | The following operators modify the tiling mode of an image, that is, the |
… | |
… | |
390 | Using these functions make your expression sensitive to window moves. |
485 | Using these functions make your expression sensitive to window moves. |
391 | |
486 | |
392 | These functions are mainly useful to align images to the root window. |
487 | These functions are mainly useful to align images to the root window. |
393 | |
488 | |
394 | Example: load an image and align it so it looks as if anchored to the |
489 | Example: load an image and align it so it looks as if anchored to the |
395 | background. |
490 | background (that's exactly what C<rootalign> does btw.): |
396 | |
491 | |
397 | move -TX, -TY, load "mybg.png" |
492 | move -TX, -TY, keep { load "mybg.png" } |
398 | |
493 | |
399 | =item TW |
494 | =item TW |
400 | |
495 | |
401 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
496 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
402 | terminal window is the full window by default, and the character area only |
497 | terminal window is the full window by default, and the character area only |
… | |
… | |
408 | the window size to conserve memory. |
503 | the window size to conserve memory. |
409 | |
504 | |
410 | Example: take the screen background, clip it to the window size, blur it a |
505 | Example: take the screen background, clip it to the window size, blur it a |
411 | bit, align it to the window position and use it as background. |
506 | bit, align it to the window position and use it as background. |
412 | |
507 | |
413 | clip move -TX, -TY, blur 5, root |
508 | clip move -TX, -TY, keep { blur 5, root } |
414 | |
509 | |
415 | =cut |
510 | =cut |
416 | |
511 | |
417 | sub TX() { $new->{position_sensitive} = 1; $x } |
512 | sub TX() { $frame->[FR_AGAIN]{position} = 1; $x } |
418 | sub TY() { $new->{position_sensitive} = 1; $y } |
513 | sub TY() { $frame->[FR_AGAIN]{position} = 1; $y } |
419 | sub TW() { $new->{size_sensitive} = 1; $w } |
514 | sub TW() { $frame->[FR_AGAIN]{size} = 1; $w } |
420 | sub TH() { $new->{size_sensitive} = 1; $h } |
515 | sub TH() { $frame->[FR_AGAIN]{size} = 1; $h } |
421 | |
516 | |
422 | =item now |
517 | =item now |
423 | |
518 | |
424 | Returns the current time as (fractional) seconds since the epoch. |
519 | Returns the current time as (fractional) seconds since the epoch. |
425 | |
520 | |
… | |
… | |
432 | C<$seconds> seconds. |
527 | C<$seconds> seconds. |
433 | |
528 | |
434 | Example: load some image and rotate it according to the time of day (as if it were |
529 | Example: load some image and rotate it according to the time of day (as if it were |
435 | the hour pointer of a clock). Update this image every minute. |
530 | the hour pointer of a clock). Update this image every minute. |
436 | |
531 | |
|
|
532 | again 60; |
437 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
533 | rotate 50, 50, (now % 86400) * -72 / 8640, scale keep { load "myclock.png" } |
438 | |
534 | |
439 | =item counter $seconds |
535 | =item counter $seconds |
440 | |
536 | |
441 | Like C<again>, but also returns an increasing counter value, starting at |
537 | Like C<again>, but also returns an increasing counter value, starting at |
442 | 0, which might be useful for some simple animation effects. |
538 | 0, which might be useful for some simple animation effects. |
… | |
… | |
444 | =cut |
540 | =cut |
445 | |
541 | |
446 | sub now() { urxvt::NOW } |
542 | sub now() { urxvt::NOW } |
447 | |
543 | |
448 | sub again($) { |
544 | sub again($) { |
449 | $new->{again} = $_[0]; |
545 | $frame->[FR_AGAIN]{time} = $_[0]; |
450 | } |
546 | } |
451 | |
547 | |
452 | sub counter($) { |
548 | sub counter($) { |
453 | $new->{again} = $_[0]; |
549 | $frame->[FR_AGAIN]{time} = $_[0]; |
454 | $self->{counter} + 0 |
550 | $frame->[FR_STATE]{counter} + 0 |
455 | } |
551 | } |
456 | |
552 | |
457 | =back |
553 | =back |
458 | |
554 | |
459 | =head2 SHAPE CHANGING OPERATORS |
555 | =head2 SHAPE CHANGING OPERATORS |
… | |
… | |
479 | assumed. |
575 | assumed. |
480 | |
576 | |
481 | Example: load an image, blur it, and clip it to the window size to save |
577 | Example: load an image, blur it, and clip it to the window size to save |
482 | memory. |
578 | memory. |
483 | |
579 | |
484 | clip blur 10, load "mybg.png" |
580 | clip keep { blur 10, load "mybg.png" } |
485 | |
581 | |
486 | =cut |
582 | =cut |
487 | |
583 | |
488 | sub clip($;$$;$$) { |
584 | sub clip($;$$;$$) { |
489 | my $img = pop; |
585 | my $img = pop; |
… | |
… | |
583 | the terminal window (or the box specified by C<$width> and C<$height> if |
679 | the terminal window (or the box specified by C<$width> and C<$height> if |
584 | given). |
680 | given). |
585 | |
681 | |
586 | Example: load an image and center it. |
682 | Example: load an image and center it. |
587 | |
683 | |
588 | center pad load "mybg.png" |
684 | center keep { pad load "mybg.png" } |
589 | |
685 | |
590 | =item rootalign $img |
686 | =item rootalign $img |
591 | |
687 | |
592 | Moves the image so that it appears glued to the screen as opposed to the |
688 | Moves the image so that it appears glued to the screen as opposed to the |
593 | window. This gives the illusion of a larger area behind the window. It is |
689 | window. This gives the illusion of a larger area behind the window. It is |
594 | exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the |
690 | exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the |
595 | top left of the screen. |
691 | top left of the screen. |
596 | |
692 | |
597 | Example: load a background image, put it in mirror mode and root align it. |
693 | Example: load a background image, put it in mirror mode and root align it. |
598 | |
694 | |
599 | rootalign mirror load "mybg.png" |
695 | rootalign keep { mirror load "mybg.png" } |
600 | |
696 | |
601 | Example: take the screen background and align it, giving the illusion of |
697 | Example: take the screen background and align it, giving the illusion of |
602 | transparency as long as the window isn't in front of other windows. |
698 | transparency as long as the window isn't in front of other windows. |
603 | |
699 | |
604 | rootalign root |
700 | rootalign root |
… | |
… | |
629 | |
725 | |
630 | sub rootalign($) { |
726 | sub rootalign($) { |
631 | move -TX, -TY, $_[0] |
727 | move -TX, -TY, $_[0] |
632 | } |
728 | } |
633 | |
729 | |
634 | =item rotate $center_x, $center_y, $degrees, $new_width, $new_height |
730 | =item rotate $center_x, $center_y, $degrees, $img |
635 | |
731 | |
636 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
732 | Rotates the image clockwise by C<$degrees> degrees, around the point at |
637 | pointer at C<$center_x> and C<$center_y> (specified as factor of image |
733 | C<$center_x> and C<$center_y> (specified as factor of image width/height). |
638 | width/height), generating a new image with width C<$new_width> and height |
|
|
639 | C<$new_height>. |
|
|
640 | |
734 | |
641 | #TODO# new width, height, maybe more operators? |
|
|
642 | |
|
|
643 | Example: rotate the image by 90 degrees |
735 | Example: rotate the image by 90 degrees around it's center. |
644 | |
736 | |
645 | =cut |
737 | rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" } |
646 | |
738 | |
|
|
739 | =cut |
|
|
740 | |
647 | sub rotate($$$$$$) { |
741 | sub rotate($$$$) { |
648 | my $img = pop; |
742 | my $img = pop; |
649 | $img->rotate ( |
743 | $img->rotate ( |
650 | $_[0] * $img->w, |
744 | $_[0] * ($img->w + $img->x), |
651 | $_[1] * $img->h, |
745 | $_[1] * ($img->h + $img->y), |
652 | $_[2] * (3.14159265 / 180), |
746 | $_[2] * (3.14159265 / 180), |
653 | $_[3], |
|
|
654 | $_[4], |
|
|
655 | ) |
747 | ) |
656 | } |
748 | } |
657 | |
749 | |
658 | =back |
750 | =back |
659 | |
751 | |
… | |
… | |
748 | |
840 | |
749 | =back |
841 | =back |
750 | |
842 | |
751 | =head2 OTHER STUFF |
843 | =head2 OTHER STUFF |
752 | |
844 | |
753 | Anything that didn't fit any of the other categories, even after appliyng |
845 | Anything that didn't fit any of the other categories, even after applying |
754 | force and closing our eyes. |
846 | force and closing our eyes. |
755 | |
847 | |
756 | =over 4 |
848 | =over 4 |
757 | |
849 | |
758 | =item once { ... } |
850 | =item once { ... } |
… | |
… | |
762 | |
854 | |
763 | The trick is that this code block is only evaluated once - future calls |
855 | The trick is that this code block is only evaluated once - future calls |
764 | will simply return the original image (yes, it should only be used with |
856 | will simply return the original image (yes, it should only be used with |
765 | images). |
857 | images). |
766 | |
858 | |
767 | This can be extremely useful to avoid redoign the same slow operations |
859 | This can be extremely useful to avoid redoing the same slow operations |
768 | again and again- for example, if your background expression takes the root |
860 | again and again- for example, if your background expression takes the root |
769 | background, blurs it and then root-aligns it it would have to blur the |
861 | background, blurs it and then root-aligns it it would have to blur the |
770 | root background on every window move or resize. |
862 | root background on every window move or resize. |
771 | |
863 | |
|
|
864 | In fact, urxvt itself encloses the whole expression in some kind of |
|
|
865 | C<once> block so it only is reevaluated as required. |
|
|
866 | |
772 | Putting the blur into a C<once> block will make sure the blur is only done |
867 | Putting the blur into a C<once> block will make sure the blur is only done |
773 | once: |
868 | once: |
774 | |
869 | |
775 | rootlign once { blur 10, root } |
870 | rootlign once { blur 10, root } |
776 | |
871 | |
777 | This leaves the question of how to force reevaluation of the block, in |
872 | This leaves the question of how to force reevaluation of the block, |
778 | case the root background changes: Right now, all once blocks forget that |
873 | in case the root background changes: If expression inside the block |
779 | they ahve been executed before each time the root background changes (if |
874 | is sensitive to some event (root background changes, window geometry |
780 | the expression is sensitive to that) or when C<once_again> is called. |
875 | changes), then it will be reevaluated automatically as needed. |
781 | |
876 | |
782 | =item once_again |
877 | =item once_again |
783 | |
878 | |
784 | Resets all C<once> block as if they had never been called, i.e. on the |
879 | Resets all C<once> block as if they had never been called, i.e. on the |
785 | next call they will be reevaluated again. |
880 | next call they will be reevaluated again. |
786 | |
881 | |
787 | =cut |
882 | =cut |
788 | |
883 | |
789 | sub once(&) { |
884 | sub once(&) { |
790 | $_ONCE_CACHE{$_[0]+0} ||= $_[0]() |
885 | my $id = $_[0]+0; |
|
|
886 | |
|
|
887 | local $frame = $self->{frame_cache}{$id} ||= [$frame]; |
|
|
888 | |
|
|
889 | unless ($frame->[FR_CACHE]) { |
|
|
890 | $frame->[FR_CACHE] = [ $_[0]() ]; |
|
|
891 | |
|
|
892 | my $self = $self; |
|
|
893 | my $frame = $frame; |
|
|
894 | Scalar::Util::weaken $frame; |
|
|
895 | $self->compile_frame ($frame, sub { |
|
|
896 | # clear this frame cache, also for all parents |
|
|
897 | for (my $frame = $frame; $frame; $frame = $frame->[0]) { |
|
|
898 | undef $frame->[FR_CACHE]; |
|
|
899 | } |
|
|
900 | |
|
|
901 | $self->recalculate; |
|
|
902 | }); |
|
|
903 | }; |
|
|
904 | |
|
|
905 | # in scalar context we always return the first original result, which |
|
|
906 | # is not quite how perl works. |
|
|
907 | wantarray |
|
|
908 | ? @{ $frame->[FR_CACHE] } |
|
|
909 | : $frame->[FR_CACHE][0] |
791 | } |
910 | } |
792 | |
911 | |
793 | sub once_again() { |
912 | sub once_again() { |
794 | %_ONCE_CACHE = (); |
913 | delete $self->{frame_cache}; |
795 | } |
914 | } |
796 | |
915 | |
797 | =back |
916 | =back |
798 | |
917 | |
799 | =cut |
918 | =cut |
800 | |
919 | |
801 | } |
920 | } |
802 | |
921 | |
803 | sub parse_expr { |
922 | sub parse_expr { |
804 | my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}"; |
923 | my $expr = eval |
|
|
924 | "sub {\n" |
|
|
925 | . "package urxvt::bgdsl;\n" |
|
|
926 | . "#line 0 'background expression'\n" |
|
|
927 | . "$_[0]\n" |
|
|
928 | . "}"; |
805 | die if $@; |
929 | die if $@; |
806 | $expr |
930 | $expr |
807 | } |
931 | } |
808 | |
932 | |
809 | # compiles a parsed expression |
933 | # compiles a parsed expression |
810 | sub set_expr { |
934 | sub set_expr { |
811 | my ($self, $expr) = @_; |
935 | my ($self, $expr) = @_; |
812 | |
936 | |
|
|
937 | $self->{root} = []; |
813 | $self->{expr} = $expr; |
938 | $self->{expr} = $expr; |
814 | $self->recalculate; |
939 | $self->recalculate; |
|
|
940 | } |
|
|
941 | |
|
|
942 | # takes a hash of sensitivity indicators and installs watchers |
|
|
943 | sub compile_frame { |
|
|
944 | my ($self, $frame, $cb) = @_; |
|
|
945 | |
|
|
946 | my $state = $frame->[urxvt::bgdsl::FR_STATE] ||= {}; |
|
|
947 | my $again = $frame->[urxvt::bgdsl::FR_AGAIN]; |
|
|
948 | |
|
|
949 | # don't keep stuff alive |
|
|
950 | Scalar::Util::weaken $state; |
|
|
951 | |
|
|
952 | if ($again->{nested}) { |
|
|
953 | $state->{nested} = 1; |
|
|
954 | } else { |
|
|
955 | delete $state->{nested}; |
|
|
956 | } |
|
|
957 | |
|
|
958 | if (my $interval = $again->{time}) { |
|
|
959 | $state->{time} = [$interval, urxvt::timer->new->after ($interval)->interval ($interval)] |
|
|
960 | if $state->{time}[0] != $interval; |
|
|
961 | |
|
|
962 | # callback *might* have changed, although we could just rule that out |
|
|
963 | $state->{time}[1]->cb (sub { |
|
|
964 | ++$state->{counter}; |
|
|
965 | $cb->(); |
|
|
966 | }); |
|
|
967 | } else { |
|
|
968 | delete $state->{time}; |
|
|
969 | } |
|
|
970 | |
|
|
971 | if ($again->{position}) { |
|
|
972 | $state->{position} = $self->on (position_change => $cb); |
|
|
973 | } else { |
|
|
974 | delete $state->{position}; |
|
|
975 | } |
|
|
976 | |
|
|
977 | if ($again->{size}) { |
|
|
978 | $state->{size} = $self->on (size_change => $cb); |
|
|
979 | } else { |
|
|
980 | delete $state->{size}; |
|
|
981 | } |
|
|
982 | |
|
|
983 | if ($again->{rootpmap}) { |
|
|
984 | $state->{rootpmap} = $self->on (rootpmap_change => $cb); |
|
|
985 | } else { |
|
|
986 | delete $state->{rootpmap}; |
|
|
987 | } |
815 | } |
988 | } |
816 | |
989 | |
817 | # evaluate the current bg expression |
990 | # evaluate the current bg expression |
818 | sub recalculate { |
991 | sub recalculate { |
819 | my ($arg_self) = @_; |
992 | my ($arg_self) = @_; |
… | |
… | |
829 | |
1002 | |
830 | $arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL; |
1003 | $arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL; |
831 | |
1004 | |
832 | # set environment to evaluate user expression |
1005 | # set environment to evaluate user expression |
833 | |
1006 | |
834 | local $self = $arg_self; |
1007 | local $self = $arg_self; |
835 | |
|
|
836 | local $HOME = $ENV{HOME}; |
1008 | local $HOME = $ENV{HOME}; |
837 | local $old = $self->{state}; |
1009 | local $frame = []; |
838 | local $new = my $state = $self->{state} = {}; |
|
|
839 | |
1010 | |
840 | ($x, $y, $w, $h) = |
|
|
841 | $self->background_geometry ($self->{border}); |
1011 | ($x, $y, $w, $h) = $self->background_geometry ($self->{border}); |
842 | |
1012 | |
843 | # evaluate user expression |
1013 | # evaluate user expression |
844 | |
1014 | |
845 | my $img = eval { $self->{expr}->() }; |
1015 | my @img = eval { $self->{expr}->() }; |
846 | warn $@ if $@;#d# |
1016 | die $@ if $@; |
847 | die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img"; |
1017 | die "background-expr did not return anything.\n" unless @img; |
|
|
1018 | die "background-expr: expected image(s), got something else.\n" |
|
|
1019 | if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img; |
848 | |
1020 | |
849 | $state->{size_sensitive} = 1 |
1021 | my $img = urxvt::bgdsl::merge @img; |
|
|
1022 | |
|
|
1023 | $frame->[FR_AGAIN]{size} = 1 |
850 | if $img->repeat_mode != urxvt::RepeatNormal; |
1024 | if $img->repeat_mode != urxvt::RepeatNormal; |
851 | |
1025 | |
852 | # if the expression is sensitive to external events, prepare reevaluation then |
1026 | # if the expression is sensitive to external events, prepare reevaluation then |
853 | |
1027 | $self->compile_frame ($frame, sub { $arg_self->recalculate }); |
854 | my $repeat; |
|
|
855 | |
|
|
856 | if (my $again = $state->{again}) { |
|
|
857 | $repeat = 1; |
|
|
858 | my $self = $self; |
|
|
859 | $state->{timer} = $again == $old->{again} |
|
|
860 | ? $old->{timer} |
|
|
861 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
|
|
862 | ++$self->{counter}; |
|
|
863 | $self->recalculate |
|
|
864 | }); |
|
|
865 | } |
|
|
866 | |
|
|
867 | if (delete $state->{position_sensitive}) { |
|
|
868 | $repeat = 1; |
|
|
869 | $self->enable (position_change => sub { $_[0]->recalculate }); |
|
|
870 | } else { |
|
|
871 | $self->disable ("position_change"); |
|
|
872 | } |
|
|
873 | |
|
|
874 | if (delete $state->{size_sensitive}) { |
|
|
875 | $repeat = 1; |
|
|
876 | $self->enable (size_change => sub { $_[0]->recalculate }); |
|
|
877 | } else { |
|
|
878 | $self->disable ("size_change"); |
|
|
879 | } |
|
|
880 | |
|
|
881 | if (delete $state->{rootpmap_sensitive}) { |
|
|
882 | $repeat = 1; |
|
|
883 | $self->enable (rootpmap_change => sub { $_[0]->recalculate }); |
|
|
884 | } else { |
|
|
885 | $self->disable ("rootpmap_change"); |
|
|
886 | } |
|
|
887 | |
1028 | |
888 | # clear stuff we no longer need |
1029 | # clear stuff we no longer need |
889 | |
1030 | |
890 | %$old = (); |
1031 | # unless (%{ $frame->[FR_STATE] }) { |
891 | |
|
|
892 | unless ($repeat) { |
|
|
893 | delete $self->{state}; |
1032 | # delete $self->{state}; |
894 | delete $self->{expr}; |
1033 | # delete $self->{expr}; |
895 | } |
1034 | # } |
896 | |
1035 | |
897 | # set background pixmap |
1036 | # set background pixmap |
898 | |
1037 | |
899 | $self->set_background ($img, $self->{border}); |
1038 | $self->set_background ($img, $self->{border}); |
900 | $self->scr_recolour (0); |
1039 | $self->scr_recolour (0); |