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| 11 | =head1 SYNOPSIS |
11 | =head1 SYNOPSIS |
| 12 | |
12 | |
| 13 | urxvt --background-expr 'background expression' |
13 | urxvt --background-expr 'background expression' |
| 14 | --background-border |
14 | --background-border |
| 15 | --background-interval seconds |
15 | --background-interval seconds |
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16 | |
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17 | =head1 QUICK AND DIRTY CHEAT SHEET |
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18 | |
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19 | Just load a random jpeg image and tile the background with it without |
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20 | scaling or anything else: |
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21 | |
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22 | load "/path/to/img.jpg" |
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23 | |
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24 | The same, but use mirroring/reflection instead of tiling: |
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25 | |
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26 | mirror load "/path/to/img.jpg" |
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27 | |
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28 | Load an image and scale it to exactly fill the terminal window: |
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29 | |
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30 | scale keep { load "/path/to/img.jpg" } |
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31 | |
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32 | Implement pseudo-transparency by using a suitably-aligned root pixmap |
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33 | as window background: |
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34 | |
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35 | rootalign root |
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36 | |
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37 | Likewise, but keep a blurred copy: |
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38 | |
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39 | rootalign keep { blur 10, root } |
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40 | |
| 17 | =head1 DESCRIPTION |
41 | =head1 DESCRIPTION |
| 18 | |
42 | |
| 19 | This extension manages the terminal background by creating a picture that |
43 | This extension manages the terminal background by creating a picture that |
| 20 | is behind the text, replacing the normal background colour. |
44 | is behind the text, replacing the normal background colour. |
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| 398 | for @_; |
422 | for @_; |
| 399 | |
423 | |
| 400 | $base |
424 | $base |
| 401 | } |
425 | } |
| 402 | |
426 | |
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427 | =back |
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428 | |
| 403 | =head2 TILING MODES |
429 | =head2 TILING MODES |
| 404 | |
430 | |
| 405 | The following operators modify the tiling mode of an image, that is, the |
431 | The following operators modify the tiling mode of an image, that is, the |
| 406 | way that pixels outside the image area are painted when the image is used. |
432 | way that pixels outside the image area are painted when the image is used. |
| 407 | |
433 | |
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| 827 | latter in a white picture. |
853 | latter in a white picture. |
| 828 | |
854 | |
| 829 | Due to idiosyncrasies in the underlying XRender extension, biases less |
855 | Due to idiosyncrasies in the underlying XRender extension, biases less |
| 830 | than zero can be I<very> slow. |
856 | than zero can be I<very> slow. |
| 831 | |
857 | |
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858 | You can also try the experimental(!) C<muladd> operator. |
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859 | |
| 832 | =cut |
860 | =cut |
| 833 | |
861 | |
| 834 | sub contrast($$;$$;$) { |
862 | sub contrast($$;$$;$) { |
| 835 | my $img = pop; |
863 | my $img = pop; |
| 836 | my ($r, $g, $b, $a) = @_; |
864 | my ($r, $g, $b, $a) = @_; |
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| 851 | $a = 1 if @_ < 4; |
879 | $a = 1 if @_ < 4; |
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880 | |
| 853 | $img = $img->clone; |
881 | $img = $img->clone; |
| 854 | $img->brightness ($r, $g, $b, $a); |
882 | $img->brightness ($r, $g, $b, $a); |
| 855 | $img |
883 | $img |
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884 | } |
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885 | |
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886 | =item muladd $mul, $add, $img # EXPERIMENTAL |
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887 | |
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888 | First multipliesthe pixels by C<$mul>, then adds C<$add>. This cna be used |
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889 | to implement brightness and contrast at the same time, with a wider value |
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890 | range than contrast and brightness operators. |
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891 | |
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892 | Due to numerous bugs in XRender implementations, it can also introduce a |
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893 | number of visual artifacts. |
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894 | |
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895 | Example: increase contrast by a factor of C<$c> without changing image |
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896 | brightness too much. |
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897 | |
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898 | muladd $c, (1 - $c) * 0.5, $img |
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899 | |
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900 | =cut |
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901 | |
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902 | sub muladd($$$) { |
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903 | $_[2]->muladd ($_[0], $_[1]) |
| 856 | } |
904 | } |
| 857 | |
905 | |
| 858 | =item blur $radius, $img |
906 | =item blur $radius, $img |
| 859 | |
907 | |
| 860 | =item blur $radius_horz, $radius_vert, $img |
908 | =item blur $radius_horz, $radius_vert, $img |
