… | |
… | |
263 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
263 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
264 | $img->fill ($colour); |
264 | $img->fill ($colour); |
265 | $img |
265 | $img |
266 | } |
266 | } |
267 | |
267 | |
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268 | =item clone $img |
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269 | |
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270 | Returns an exact copy of the image. This is useful if you want to have |
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271 | multiple copies of the same image to apply different effects to. |
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272 | |
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273 | =cut |
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274 | |
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275 | sub clone($) { |
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276 | $_[0]->clone |
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277 | } |
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278 | |
268 | =back |
279 | =back |
269 | |
280 | |
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281 | =head2 TILING MODES |
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282 | |
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283 | The following operators modify the tiling mode of an image, that is, the |
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284 | way that pixels outside the image area are painted when the image is used. |
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285 | |
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286 | =over 4 |
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287 | |
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288 | =item tile $img |
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289 | |
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290 | Tiles the whole plane with the image and returns this new image - or in |
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291 | other words, it returns a copy of the image in plane tiling mode. |
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292 | |
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293 | Example: load an image and tile it over the background, without |
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294 | resizing. The C<tile> call is superfluous because C<load> already defaults |
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295 | to tiling mode. |
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296 | |
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297 | tile load "mybg.png" |
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298 | |
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299 | =item mirror $img |
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300 | |
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301 | Similar to tile, but reflects the image each time it uses a new copy, so |
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302 | that top edges always touch top edges, right edges always touch right |
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303 | edges and so on (with normal tiling, left edges always touch right edges |
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304 | and top always touch bottom edges). |
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305 | |
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306 | Example: load an image and mirror it over the background, avoiding sharp |
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307 | edges at the image borders at the expense of mirroring the image itself |
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308 | |
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309 | mirror load "mybg.png" |
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310 | |
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311 | =item pad $img |
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312 | |
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313 | Takes an image and modifies it so that all pixels outside the image area |
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314 | become transparent. This mode is most useful when you want to place an |
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315 | image over another image or the background colour while leaving all |
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316 | background pixels outside the image unchanged. |
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317 | |
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318 | Example: load an image and display it in the upper left corner. The rest |
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319 | of the space is left "empty" (transparent or wahtever your compisotr does |
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320 | in alpha mode, else background colour). |
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321 | |
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322 | pad load "mybg.png" |
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323 | |
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324 | =item extend $img |
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325 | |
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326 | Extends the image over the whole plane, using the closest pixel in the |
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327 | area outside the image. This mode is mostly useful when you more complex |
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328 | filtering operations and want the pixels outside the image to have the |
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329 | same values as the pixels near the edge. |
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330 | |
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331 | Example: just for curiosity, how does this pixel extension stuff work? |
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332 | |
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333 | extend move 50, 50, load "mybg.png" |
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334 | |
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335 | =cut |
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336 | |
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337 | sub pad($) { |
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338 | my $img = $_[0]->clone; |
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339 | $img->repeat_mode (urxvt::RepeatNone); |
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340 | $img |
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341 | } |
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342 | |
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343 | sub tile($) { |
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344 | my $img = $_[0]->clone; |
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345 | $img->repeat_mode (urxvt::RepeatNormal); |
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346 | $img |
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347 | } |
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348 | |
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349 | sub mirror($) { |
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350 | my $img = $_[0]->clone; |
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351 | $img->repeat_mode (urxvt::RepeatReflect); |
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352 | $img |
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353 | } |
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354 | |
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355 | sub extend($) { |
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356 | my $img = $_[0]->clone; |
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357 | $img->repeat_mode (urxvt::RepeatPad); |
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358 | $img |
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359 | } |
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360 | |
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361 | =back |
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362 | |
270 | =head2 VARIABLES |
363 | =head2 VARIABLE VALUES |
271 | |
364 | |
272 | The following functions provide variable data such as the terminal window |
365 | The following functions provide variable data such as the terminal window |
273 | dimensions. They are not (Perl-) variables, they jsut return stuff that |
366 | dimensions. They are not (Perl-) variables, they just return stuff that |
274 | varies. Most of them make your expression sensitive to some events, for |
367 | varies. Most of them make your expression sensitive to some events, for |
275 | example using C<TW> (terminal width) means your expression is evaluated |
368 | example using C<TW> (terminal width) means your expression is evaluated |
276 | again when the terminal is resized. |
369 | again when the terminal is resized. |
277 | |
370 | |
278 | =over 4 |
371 | =over 4 |
… | |
… | |
352 | $self->{counter} + 0 |
445 | $self->{counter} + 0 |
353 | } |
446 | } |
354 | |
447 | |
355 | =back |
448 | =back |
356 | |
449 | |
357 | =head2 TILING MODES |
450 | =head2 SHAPE CHANGING OPERATORS |
358 | |
451 | |
359 | The following operators modify the tiling mode of an image, that is, the |
452 | 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 | |
453 | |
362 | =over 4 |
454 | =over 4 |
363 | |
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364 | =item tile $img |
|
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365 | |
|
|
366 | Tiles the whole plane with the image and returns this new image - or in |
|
|
367 | other words, it returns a copy of the image in plane tiling mode. |
|
|
368 | |
|
|
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 | |
|
|
377 | Similar to tile, but reflects the image each time it uses a new copy, so |
|
|
378 | that top edges always touch top edges, right edges always touch right |
|
|
379 | edges and so on (with normal tiling, left edges always touch right edges |
|
|
380 | and top always touch bottom edges). |
|
|
381 | |
|
|
382 | Example: load an image and mirror it over the background, avoiding sharp |
|
|
383 | edges at the image borders at the expense of mirroring the image itself |
|
|
384 | |
|
|
385 | mirror load "mybg.png" |
|
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386 | |
|
|
387 | =item pad $img |
|
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388 | |
|
|
389 | Takes an image and modifies it so that all pixels outside the image area |
|
|
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 | |
|
|
394 | Example: load an image and display it in the upper left corner. The rest |
|
|
395 | of the space is left "empty" (transparent or wahtever your compisotr does |
|
|
396 | in alpha mode, else background colour). |
|
|
397 | |
|
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398 | pad load "mybg.png" |
|
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399 | |
|
|
400 | =item extend $img |
|
|
401 | |
|
|
402 | Extends the image over the whole plane, using the closest pixel in the |
|
|
403 | area outside the image. This mode is mostly useful when you more complex |
|
|
404 | filtering operations and want the pixels outside the image to have the |
|
|
405 | same values as the pixels near the edge. |
|
|
406 | |
|
|
407 | Example: just for curiosity, how does this pixel extension stuff work? |
|
|
408 | |
|
|
409 | extend move 50, 50, load "mybg.png" |
|
|
410 | |
|
|
411 | =cut |
|
|
412 | |
|
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413 | sub pad($) { |
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414 | my $img = $_[0]->clone; |
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415 | $img->repeat_mode (urxvt::RepeatNone); |
|
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416 | $img |
|
|
417 | } |
|
|
418 | |
|
|
419 | sub tile($) { |
|
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420 | my $img = $_[0]->clone; |
|
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421 | $img->repeat_mode (urxvt::RepeatNormal); |
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422 | $img |
|
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423 | } |
|
|
424 | |
|
|
425 | sub mirror($) { |
|
|
426 | my $img = $_[0]->clone; |
|
|
427 | $img->repeat_mode (urxvt::RepeatReflect); |
|
|
428 | $img |
|
|
429 | } |
|
|
430 | |
|
|
431 | sub extend($) { |
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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 |
|
|
435 | } |
|
|
436 | |
|
|
437 | =back |
|
|
438 | |
|
|
439 | =head2 PIXEL OPERATORS |
|
|
440 | |
|
|
441 | The following operators modify the image pixels in various ways. |
|
|
442 | |
|
|
443 | =over 4 |
|
|
444 | |
|
|
445 | =item clone $img |
|
|
446 | |
|
|
447 | Returns an exact copy of the image. |
|
|
448 | |
|
|
449 | =cut |
|
|
450 | |
|
|
451 | sub clone($) { |
|
|
452 | $_[0]->clone |
|
|
453 | } |
|
|
454 | |
455 | |
455 | =item clip $img |
456 | =item clip $img |
456 | |
457 | |
457 | =item clip $width, $height, $img |
458 | =item clip $width, $height, $img |
458 | |
459 | |
… | |
… | |
552 | |
553 | |
553 | Example: move the image right by 20 pixels and down by 30. |
554 | Example: move the image right by 20 pixels and down by 30. |
554 | |
555 | |
555 | move 20, 30, ... |
556 | move 20, 30, ... |
556 | |
557 | |
|
|
558 | =item center $img |
|
|
559 | |
|
|
560 | =item center $width, $height, $img |
|
|
561 | |
|
|
562 | Centers the image, i.e. the center of the image is moved to the center of |
|
|
563 | the terminal window (or the box specified by C<$width> and C<$height> if |
|
|
564 | given). |
|
|
565 | |
557 | =item rootalign $img |
566 | =item rootalign $img |
558 | |
567 | |
559 | Moves the image so that it appears glued to the screen as opposed to the |
568 | Moves the image so that it appears glued to the screen as opposed to the |
560 | window. This gives the illusion of a larger area behind the window. It is |
569 | window. This gives the illusion of a larger area behind the window. It is |
561 | exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the |
570 | exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the |
… | |
… | |
576 | my $img = pop->clone; |
585 | my $img = pop->clone; |
577 | $img->move ($_[0], $_[1]); |
586 | $img->move ($_[0], $_[1]); |
578 | $img |
587 | $img |
579 | } |
588 | } |
580 | |
589 | |
|
|
590 | sub center($;$$) { |
|
|
591 | my $img = pop; |
|
|
592 | my $w = $_[0] || TW; |
|
|
593 | my $h = $_[0] || TH; |
|
|
594 | |
|
|
595 | move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img |
|
|
596 | } |
|
|
597 | |
581 | sub rootalign($) { |
598 | sub rootalign($) { |
582 | move -TX, -TY, $_[0] |
599 | move -TX, -TY, $_[0] |
583 | } |
600 | } |
584 | |
601 | |
|
|
602 | =back |
|
|
603 | |
|
|
604 | =head2 COLOUR MODIFICATIONS |
|
|
605 | |
|
|
606 | The following operators change the pixels of the image. |
|
|
607 | |
|
|
608 | =over 4 |
|
|
609 | |
585 | =item contrast $factor, $img |
610 | =item contrast $factor, $img |
586 | |
611 | |
587 | =item contrast $r, $g, $b, $img |
612 | =item contrast $r, $g, $b, $img |
588 | |
613 | |
589 | =item contrast $r, $g, $b, $a, $img |
614 | =item contrast $r, $g, $b, $a, $img |
590 | |
615 | |
591 | Adjusts the I<contrast> of an image. |
616 | Adjusts the I<contrast> of an image. |
592 | |
617 | |
593 | #TODO# |
618 | The first form applies a single C<$factor> to red, green and blue, the |
|
|
619 | second form applies separate factors to each colour channel, and the last |
|
|
620 | form includes the alpha channel. |
594 | |
621 | |
|
|
622 | Values from 0 to 1 lower the contrast, values higher than 1 increase the |
|
|
623 | contrast. |
|
|
624 | |
|
|
625 | Due to limitations in the underlying XRender extension, lowering contrast |
|
|
626 | also reduces brightness, while increasing contrast currently also |
|
|
627 | increases brightness. |
|
|
628 | |
595 | =item brightness $factor, $img |
629 | =item brightness $bias, $img |
596 | |
630 | |
597 | =item brightness $r, $g, $b, $img |
631 | =item brightness $r, $g, $b, $img |
598 | |
632 | |
599 | =item brightness $r, $g, $b, $a, $img |
633 | =item brightness $r, $g, $b, $a, $img |
600 | |
634 | |
601 | Adjusts the brightness of an image. |
635 | Adjusts the brightness of an image. |
|
|
636 | |
|
|
637 | The first form applies a single C<$bias> to red, green and blue, the |
|
|
638 | second form applies separate biases to each colour channel, and the last |
|
|
639 | form includes the alpha channel. |
|
|
640 | |
|
|
641 | Values less than 0 reduce brightness, while values larger than 0 increase |
|
|
642 | it. Useful range is from -1 to 1 - the former results in a black, the |
|
|
643 | latter in a white picture. |
|
|
644 | |
|
|
645 | Due to idiosynchrasies in the underlying XRender extension, biases less |
|
|
646 | than zero can be I<very> slow. |
602 | |
647 | |
603 | =cut |
648 | =cut |
604 | |
649 | |
605 | sub contrast($$;$$;$) { |
650 | sub contrast($$;$$;$) { |
606 | my $img = pop; |
651 | my $img = pop; |