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: |
… | |
… | |
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; |
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208 | our %_ONCE_CACHE; |
198 | our $HOME; |
209 | our $HOME; |
199 | our ($self, $old, $new); |
210 | our ($self, $old, $new); |
200 | our ($x, $y, $w, $h); |
211 | our ($x, $y, $w, $h); |
201 | |
212 | |
202 | # enforce at least this interval between updates |
213 | # enforce at least this interval between updates |
203 | our $MIN_INTERVAL = 1/100; |
214 | our $MIN_INTERVAL = 6/59.951; |
204 | |
215 | |
205 | { |
216 | { |
206 | package urxvt::bgdsl; # background language |
217 | package urxvt::bgdsl; # background language |
207 | |
218 | |
208 | use List::Util qw(min max sum shuffle); |
219 | use List::Util qw(min max sum shuffle); |
… | |
… | |
240 | |
251 | |
241 | =cut |
252 | =cut |
242 | |
253 | |
243 | sub root() { |
254 | sub root() { |
244 | $new->{rootpmap_sensitive} = 1; |
255 | $new->{rootpmap_sensitive} = 1; |
245 | die "root op not supported, exg, we need you"; |
256 | $self->new_img_from_root |
246 | } |
257 | } |
247 | |
258 | |
248 | =item solid $colour |
259 | =item solid $colour |
249 | |
260 | |
250 | =item solid $width, $height, $colour |
261 | =item solid $width, $height, $colour |
… | |
… | |
263 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
274 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
264 | $img->fill ($colour); |
275 | $img->fill ($colour); |
265 | $img |
276 | $img |
266 | } |
277 | } |
267 | |
278 | |
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279 | =item clone $img |
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280 | |
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281 | Returns an exact copy of the image. This is useful if you want to have |
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282 | multiple copies of the same image to apply different effects to. |
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283 | |
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284 | =cut |
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285 | |
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286 | sub clone($) { |
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287 | $_[0]->clone |
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288 | } |
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289 | |
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290 | =head2 TILING MODES |
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291 | |
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292 | The following operators modify the tiling mode of an image, that is, the |
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293 | way that pixels outside the image area are painted when the image is used. |
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294 | |
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295 | =over 4 |
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296 | |
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297 | =item tile $img |
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298 | |
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299 | Tiles the whole plane with the image and returns this new image - or in |
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300 | other words, it returns a copy of the image in plane tiling mode. |
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301 | |
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302 | Example: load an image and tile it over the background, without |
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303 | resizing. The C<tile> call is superfluous because C<load> already defaults |
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304 | to tiling mode. |
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305 | |
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306 | tile load "mybg.png" |
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307 | |
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308 | =item mirror $img |
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309 | |
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310 | Similar to tile, but reflects the image each time it uses a new copy, so |
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311 | that top edges always touch top edges, right edges always touch right |
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312 | edges and so on (with normal tiling, left edges always touch right edges |
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313 | and top always touch bottom edges). |
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314 | |
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315 | Example: load an image and mirror it over the background, avoiding sharp |
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316 | edges at the image borders at the expense of mirroring the image itself |
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317 | |
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318 | mirror load "mybg.png" |
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319 | |
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320 | =item pad $img |
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321 | |
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322 | Takes an image and modifies it so that all pixels outside the image area |
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323 | become transparent. This mode is most useful when you want to place an |
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324 | image over another image or the background colour while leaving all |
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325 | background pixels outside the image unchanged. |
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326 | |
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327 | Example: load an image and display it in the upper left corner. The rest |
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328 | of the space is left "empty" (transparent or whatever your compositor does |
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329 | in alpha mode, else background colour). |
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330 | |
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331 | pad load "mybg.png" |
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332 | |
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333 | =item extend $img |
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334 | |
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335 | Extends the image over the whole plane, using the closest pixel in the |
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336 | area outside the image. This mode is mostly useful when you use more complex |
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337 | filtering operations and want the pixels outside the image to have the |
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338 | same values as the pixels near the edge. |
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339 | |
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340 | Example: just for curiosity, how does this pixel extension stuff work? |
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341 | |
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342 | extend move 50, 50, load "mybg.png" |
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343 | |
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344 | =cut |
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345 | |
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346 | sub pad($) { |
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347 | my $img = $_[0]->clone; |
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348 | $img->repeat_mode (urxvt::RepeatNone); |
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349 | $img |
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350 | } |
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351 | |
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352 | sub tile($) { |
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353 | my $img = $_[0]->clone; |
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354 | $img->repeat_mode (urxvt::RepeatNormal); |
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355 | $img |
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356 | } |
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357 | |
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358 | sub mirror($) { |
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359 | my $img = $_[0]->clone; |
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360 | $img->repeat_mode (urxvt::RepeatReflect); |
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361 | $img |
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362 | } |
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363 | |
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364 | sub extend($) { |
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365 | my $img = $_[0]->clone; |
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366 | $img->repeat_mode (urxvt::RepeatPad); |
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367 | $img |
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368 | } |
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369 | |
268 | =back |
370 | =back |
269 | |
371 | |
270 | =head2 VARIABLES |
372 | =head2 VARIABLE VALUES |
271 | |
373 | |
272 | The following functions provide variable data such as the terminal window |
374 | The following functions provide variable data such as the terminal window |
273 | dimensions. They are not (Perl-) variables, they jsut return stuff that |
375 | dimensions. They are not (Perl-) variables, they just return stuff that |
274 | varies. Most of them make your expression sensitive to some events, for |
376 | varies. Most of them make your expression sensitive to some events, for |
275 | example using C<TW> (terminal width) means your expression is evaluated |
377 | example using C<TW> (terminal width) means your expression is evaluated |
276 | again when the terminal is resized. |
378 | again when the terminal is resized. |
277 | |
379 | |
278 | =over 4 |
380 | =over 4 |
… | |
… | |
330 | C<$seconds> seconds. |
432 | C<$seconds> seconds. |
331 | |
433 | |
332 | Example: load some image and rotate it according to the time of day (as if it were |
434 | Example: load some image and rotate it according to the time of day (as if it were |
333 | the hour pointer of a clock). Update this image every minute. |
435 | the hour pointer of a clock). Update this image every minute. |
334 | |
436 | |
335 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
437 | again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
336 | |
438 | |
337 | =item counter $seconds |
439 | =item counter $seconds |
338 | |
440 | |
339 | Like C<again>, but also returns an increasing counter value, starting at |
441 | Like C<again>, but also returns an increasing counter value, starting at |
340 | 0, which might be useful for some simple animation effects. |
442 | 0, which might be useful for some simple animation effects. |
… | |
… | |
352 | $self->{counter} + 0 |
454 | $self->{counter} + 0 |
353 | } |
455 | } |
354 | |
456 | |
355 | =back |
457 | =back |
356 | |
458 | |
357 | =head2 TILING MODES |
459 | =head2 SHAPE CHANGING OPERATORS |
358 | |
460 | |
359 | The following operators modify the tiling mode of an image, that is, the |
461 | The following operators modify the shape, size or position of the image. |
360 | way that pixels outside the image area are painted when the image is used. |
|
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361 | |
462 | |
362 | =over 4 |
463 | =over 4 |
363 | |
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364 | =item tile $img |
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365 | |
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366 | Tiles the whole plane with the image and returns this new image - or in |
|
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367 | other words, it returns a copy of the image in plane tiling mode. |
|
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368 | |
|
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369 | Example: load an image and tile it over the background, without |
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370 | resizing. The C<tile> call is superfluous because C<load> already defaults |
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371 | to tiling mode. |
|
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372 | |
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373 | tile load "mybg.png" |
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374 | |
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375 | =item mirror $img |
|
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376 | |
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377 | Similar to tile, but reflects the image each time it uses a new copy, so |
|
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378 | that top edges always touch top edges, right edges always touch right |
|
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379 | edges and so on (with normal tiling, left edges always touch right edges |
|
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380 | and top always touch bottom edges). |
|
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381 | |
|
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382 | Example: load an image and mirror it over the background, avoiding sharp |
|
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383 | edges at the image borders at the expense of mirroring the image itself |
|
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384 | |
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385 | mirror load "mybg.png" |
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386 | |
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387 | =item pad $img |
|
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388 | |
|
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389 | Takes an image and modifies it so that all pixels outside the image area |
|
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390 | 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 |
|
|
392 | background pixels outside the image unchanged. |
|
|
393 | |
|
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394 | Example: load an image and display it in the upper left corner. The rest |
|
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395 | of the space is left "empty" (transparent or wahtever your compisotr does |
|
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396 | in alpha mode, else background colour). |
|
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397 | |
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398 | pad load "mybg.png" |
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399 | |
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400 | =item extend $img |
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401 | |
|
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402 | Extends the image over the whole plane, using the closest pixel in the |
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403 | area outside the image. This mode is mostly useful when you more complex |
|
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404 | filtering operations and want the pixels outside the image to have the |
|
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405 | same values as the pixels near the edge. |
|
|
406 | |
|
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407 | Example: just for curiosity, how does this pixel extension stuff work? |
|
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408 | |
|
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409 | extend move 50, 50, load "mybg.png" |
|
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410 | |
|
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411 | =cut |
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412 | |
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413 | sub pad($) { |
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414 | my $img = $_[0]->clone; |
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415 | $img->repeat_mode (urxvt::RepeatNone); |
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416 | $img |
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417 | } |
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418 | |
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419 | sub tile($) { |
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420 | my $img = $_[0]->clone; |
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421 | $img->repeat_mode (urxvt::RepeatNormal); |
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422 | $img |
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423 | } |
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424 | |
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425 | sub mirror($) { |
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426 | my $img = $_[0]->clone; |
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427 | $img->repeat_mode (urxvt::RepeatReflect); |
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428 | $img |
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429 | } |
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430 | |
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431 | sub extend($) { |
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432 | my $img = $_[0]->clone; |
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433 | $img->repeat_mode (urxvt::RepeatPad); |
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434 | $img |
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435 | } |
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436 | |
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437 | =back |
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438 | |
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439 | =head2 PIXEL OPERATORS |
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440 | |
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441 | The following operators modify the image pixels in various ways. |
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442 | |
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443 | =over 4 |
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444 | |
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445 | =item clone $img |
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446 | |
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447 | Returns an exact copy of the image. |
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448 | |
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449 | =cut |
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450 | |
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451 | sub clone($) { |
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452 | $_[0]->clone |
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453 | } |
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454 | |
464 | |
455 | =item clip $img |
465 | =item clip $img |
456 | |
466 | |
457 | =item clip $width, $height, $img |
467 | =item clip $width, $height, $img |
458 | |
468 | |
… | |
… | |
552 | |
562 | |
553 | Example: move the image right by 20 pixels and down by 30. |
563 | Example: move the image right by 20 pixels and down by 30. |
554 | |
564 | |
555 | move 20, 30, ... |
565 | move 20, 30, ... |
556 | |
566 | |
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567 | =item align $xalign, $yalign, $img |
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568 | |
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569 | Aligns the image according to a factor - C<0> means the image is moved to |
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570 | the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is |
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571 | exactly centered and C<1> means it touches the right or bottom edge. |
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572 | |
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573 | Example: remove any visible border around an image, center it vertically but move |
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574 | it to the right hand side. |
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575 | |
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576 | align 1, 0.5, pad $img |
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577 | |
557 | =item center $img |
578 | =item center $img |
558 | |
579 | |
559 | =item center $width, $height, $img |
580 | =item center $width, $height, $img |
560 | |
581 | |
561 | Centers the image, i.e. the center of the image is moved to the center of |
582 | Centers the image, i.e. the center of the image is moved to the center of |
562 | the terminal window (or the box specified by C<$width> and C<$height> if |
583 | the terminal window (or the box specified by C<$width> and C<$height> if |
563 | given). |
584 | given). |
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585 | |
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586 | Example: load an image and center it. |
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587 | |
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588 | center pad load "mybg.png" |
564 | |
589 | |
565 | =item rootalign $img |
590 | =item rootalign $img |
566 | |
591 | |
567 | Moves the image so that it appears glued to the screen as opposed to the |
592 | Moves the image so that it appears glued to the screen as opposed to the |
568 | window. This gives the illusion of a larger area behind the window. It is |
593 | window. This gives the illusion of a larger area behind the window. It is |
… | |
… | |
574 | rootalign mirror load "mybg.png" |
599 | rootalign mirror load "mybg.png" |
575 | |
600 | |
576 | Example: take the screen background and align it, giving the illusion of |
601 | Example: take the screen background and align it, giving the illusion of |
577 | transparency as long as the window isn't in front of other windows. |
602 | transparency as long as the window isn't in front of other windows. |
578 | |
603 | |
579 | rootalign root |
604 | rootalign root |
580 | |
605 | |
581 | =cut |
606 | =cut |
582 | |
607 | |
583 | sub move($$;$) { |
608 | sub move($$;$) { |
584 | my $img = pop->clone; |
609 | my $img = pop->clone; |
585 | $img->move ($_[0], $_[1]); |
610 | $img->move ($_[0], $_[1]); |
586 | $img |
611 | $img |
587 | } |
612 | } |
588 | |
613 | |
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614 | sub align($;$$) { |
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615 | my $img = pop; |
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616 | |
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617 | move $_[0] * (TW - $img->w), |
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618 | $_[1] * (TH - $img->h), |
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619 | $img |
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620 | } |
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621 | |
589 | sub center($;$$) { |
622 | sub center($;$$) { |
590 | my $img = pop; |
623 | my $img = pop; |
591 | my $w = $_[0] || TW; |
624 | my $w = $_[0] || TW; |
592 | my $h = $_[0] || TH; |
625 | my $h = $_[1] || TH; |
593 | |
626 | |
594 | move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img |
627 | move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img |
595 | } |
628 | } |
596 | |
629 | |
597 | sub rootalign($) { |
630 | sub rootalign($) { |
598 | move -TX, -TY, $_[0] |
631 | move -TX, -TY, $_[0] |
599 | } |
632 | } |
600 | |
633 | |
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634 | =item rotate $center_x, $center_y, $degrees |
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635 | |
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636 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
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637 | pointer at C<$center_x> and C<$center_y> (specified as factor of image |
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638 | width/height). |
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639 | |
|
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640 | #TODO# new width, height, maybe more operators? |
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641 | |
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642 | Example: rotate the image by 90 degrees |
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643 | |
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644 | =cut |
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645 | |
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646 | sub rotate($$$$) { |
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647 | my $img = pop; |
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648 | $img->rotate ( |
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649 | $_[0] * $img->w, |
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650 | $_[1] * $img->h, |
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651 | $_[2] * (3.14159265 / 180), |
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652 | ) |
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653 | } |
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654 | |
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655 | =back |
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656 | |
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657 | =head2 COLOUR MODIFICATIONS |
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658 | |
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659 | The following operators change the pixels of the image. |
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660 | |
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661 | =over 4 |
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662 | |
601 | =item contrast $factor, $img |
663 | =item contrast $factor, $img |
602 | |
664 | |
603 | =item contrast $r, $g, $b, $img |
665 | =item contrast $r, $g, $b, $img |
604 | |
666 | |
605 | =item contrast $r, $g, $b, $a, $img |
667 | =item contrast $r, $g, $b, $a, $img |
606 | |
668 | |
607 | Adjusts the I<contrast> of an image. |
669 | Adjusts the I<contrast> of an image. |
608 | |
670 | |
609 | #TODO# |
671 | The first form applies a single C<$factor> to red, green and blue, the |
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672 | second form applies separate factors to each colour channel, and the last |
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673 | form includes the alpha channel. |
610 | |
674 | |
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675 | Values from 0 to 1 lower the contrast, values higher than 1 increase the |
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676 | contrast. |
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677 | |
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678 | Due to limitations in the underlying XRender extension, lowering contrast |
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679 | also reduces brightness, while increasing contrast currently also |
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680 | increases brightness. |
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681 | |
611 | =item brightness $factor, $img |
682 | =item brightness $bias, $img |
612 | |
683 | |
613 | =item brightness $r, $g, $b, $img |
684 | =item brightness $r, $g, $b, $img |
614 | |
685 | |
615 | =item brightness $r, $g, $b, $a, $img |
686 | =item brightness $r, $g, $b, $a, $img |
616 | |
687 | |
617 | Adjusts the brightness of an image. |
688 | Adjusts the brightness of an image. |
618 | |
689 | |
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690 | The first form applies a single C<$bias> to red, green and blue, the |
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691 | second form applies separate biases to each colour channel, and the last |
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692 | form includes the alpha channel. |
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693 | |
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694 | Values less than 0 reduce brightness, while values larger than 0 increase |
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695 | it. Useful range is from -1 to 1 - the former results in a black, the |
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696 | latter in a white picture. |
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697 | |
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698 | Due to idiosyncrasies in the underlying XRender extension, biases less |
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699 | than zero can be I<very> slow. |
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700 | |
619 | =cut |
701 | =cut |
620 | |
702 | |
621 | sub contrast($$;$$;$) { |
703 | sub contrast($$;$$;$) { |
622 | my $img = pop; |
704 | my $img = pop; |
623 | my ($r, $g, $b, $a) = @_; |
705 | my ($r, $g, $b, $a) = @_; |
624 | |
706 | |
625 | ($g, $b) = ($r, $r) if @_ < 4; |
707 | ($g, $b) = ($r, $r) if @_ < 3; |
626 | $a = 1 if @_ < 5; |
708 | $a = 1 if @_ < 4; |
627 | |
709 | |
628 | $img = $img->clone; |
710 | $img = $img->clone; |
629 | $img->contrast ($r, $g, $b, $a); |
711 | $img->contrast ($r, $g, $b, $a); |
630 | $img |
712 | $img |
631 | } |
713 | } |
632 | |
714 | |
633 | sub brightness($$;$$;$) { |
715 | sub brightness($$;$$;$) { |
634 | my $img = pop; |
716 | my $img = pop; |
635 | my ($r, $g, $b, $a) = @_; |
717 | my ($r, $g, $b, $a) = @_; |
636 | |
718 | |
637 | ($g, $b) = ($r, $r) if @_ < 4; |
719 | ($g, $b) = ($r, $r) if @_ < 3; |
638 | $a = 1 if @_ < 5; |
720 | $a = 1 if @_ < 4; |
639 | |
721 | |
640 | $img = $img->clone; |
722 | $img = $img->clone; |
641 | $img->brightness ($r, $g, $b, $a); |
723 | $img->brightness ($r, $g, $b, $a); |
642 | $img |
724 | $img |
643 | } |
725 | } |
… | |
… | |
659 | sub blur($$;$) { |
741 | sub blur($$;$) { |
660 | my $img = pop; |
742 | my $img = pop; |
661 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
743 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
662 | } |
744 | } |
663 | |
745 | |
664 | =item rotate $new_width, $new_height, $center_x, $center_y, $degrees |
746 | =back |
665 | |
747 | |
666 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
748 | =head2 OTHER STUFF |
667 | pointer at C<$center_x> and C<$center_y> (specified as factor of image |
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668 | width/height), generating a new image with width C<$new_width> and height |
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669 | C<$new_height>. |
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670 | |
749 | |
671 | #TODO# new width, height, maybe more operators? |
750 | Anything that didn't fit any of the other categories, even after appliyng |
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751 | force and closing our eyes. |
672 | |
752 | |
673 | Example: rotate the image by 90 degrees |
753 | =over 4 |
674 | |
754 | |
675 | =cut |
755 | =item once { ... } |
676 | |
756 | |
677 | sub rotate($$$$$$) { |
757 | This function takes a code block as argument, that is, one or more |
678 | my $img = pop; |
758 | statements enclosed by braces. |
679 | $img->rotate ( |
759 | |
680 | $_[0], |
760 | The trick is that this code block is only evaluated once - future calls |
681 | $_[1], |
761 | will simply return the original image (yes, it should only be used with |
682 | $_[2] * $img->w, |
762 | images). |
683 | $_[3] * $img->h, |
763 | |
684 | $_[4] * (3.14159265 / 180), |
764 | This can be extremely useful to avoid redoign the same slow operations |
685 | ) |
765 | again and again- for example, if your background expression takes the root |
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766 | background, blurs it and then root-aligns it it would have to blur the |
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767 | root background on every window move or resize. |
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768 | |
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769 | Putting the blur into a C<once> block will make sure the blur is only done |
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770 | once: |
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771 | |
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772 | rootlign once { blur 10, root } |
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773 | |
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774 | This leaves the question of how to force reevaluation of the block, in |
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775 | case the root background changes: Right now, all once blocks forget that |
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776 | they ahve been executed before each time the root background changes (if |
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777 | the expression is sensitive to that) or when C<once_again> is called. |
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778 | |
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779 | =item once_again |
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780 | |
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781 | Resets all C<once> block as if they had never been called, i.e. on the |
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782 | next call they will be reevaluated again. |
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783 | |
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784 | =cut |
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785 | |
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786 | sub once(&) { |
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787 | $_ONCE_CACHE{$_[0]+0} ||= $_[0]() |
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788 | } |
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789 | |
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790 | sub once_again() { |
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791 | %_ONCE_CACHE = (); |
686 | } |
792 | } |
687 | |
793 | |
688 | =back |
794 | =back |
689 | |
795 | |
690 | =cut |
796 | =cut |
… | |
… | |
733 | |
839 | |
734 | # evaluate user expression |
840 | # evaluate user expression |
735 | |
841 | |
736 | my $img = eval { $self->{expr}->() }; |
842 | my $img = eval { $self->{expr}->() }; |
737 | warn $@ if $@;#d# |
843 | warn $@ if $@;#d# |
738 | die if !UNIVERSAL::isa $img, "urxvt::img"; |
844 | die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img"; |
739 | |
845 | |
740 | $state->{size_sensitive} = 1 |
846 | $state->{size_sensitive} = 1 |
741 | if $img->repeat_mode != urxvt::RepeatNormal; |
847 | if $img->repeat_mode != urxvt::RepeatNormal; |
742 | |
848 | |
743 | # if the expression is sensitive to external events, prepare reevaluation then |
849 | # if the expression is sensitive to external events, prepare reevaluation then |
… | |
… | |
793 | } |
899 | } |
794 | |
900 | |
795 | sub on_start { |
901 | sub on_start { |
796 | my ($self) = @_; |
902 | my ($self) = @_; |
797 | |
903 | |
798 | my $expr = $self->x_resource ("background.expr") |
904 | my $expr = $self->x_resource ("%.expr") |
799 | or return; |
905 | or return; |
800 | |
906 | |
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907 | $self->has_render |
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908 | or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n"; |
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909 | |
801 | $self->set_expr (parse_expr $expr); |
910 | $self->set_expr (parse_expr $expr); |
802 | $self->{border} = $self->x_resource_boolean ("background.border"); |
911 | $self->{border} = $self->x_resource_boolean ("%.border"); |
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912 | |
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913 | $MIN_INTERVAL = $self->x_resource ("%.interval"); |
803 | |
914 | |
804 | () |
915 | () |
805 | } |
916 | } |
806 | |
917 | |