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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.79 by root, Tue Sep 4 22:41:11 2012 UTC vs.
Revision 1.83 by sf-exg, Sun Jun 2 17:55:07 2013 UTC

… …
308 308
309Loads the image at the given C<$path>. The image is set to plane tiling 309Loads the image at the given C<$path>. The image is set to plane tiling
310mode. 310mode.
311 311
312If the image is already in memory (e.g. because another terminal instance 312If the image is already in memory (e.g. because another terminal instance
313uses it), then the in-memory copy us returned instead. 313uses it), then the in-memory copy is returned instead.
314 314
315=item load_uc $path 315=item load_uc $path
316 316
317Load uncached - same as load, but does not cache the image, which means it 317Load uncached - same as load, but does not cache the image, which means it
318is I<always> loaded from the filesystem again, even if another copy of it 318is I<always> loaded from the filesystem again, even if another copy of it
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641=item scale $width_factor, $height_factor, $img 641=item scale $width_factor, $height_factor, $img
642 642
643Scales the image by the given factors in horizontal 643Scales the image by the given factors in horizontal
644(C<$width>) and vertical (C<$height>) direction. 644(C<$width>) and vertical (C<$height>) direction.
645 645
646If only one factor is give, it is used for both directions. 646If only one factor is given, it is used for both directions.
647 647
648If no factors are given, scales the image to the window size without 648If no factors are given, scales the image to the window size without
649keeping aspect. 649keeping aspect.
650 650
651=item resize $width, $height, $img 651=item resize $width, $height, $img
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776=item rotate $center_x, $center_y, $degrees, $img 776=item rotate $center_x, $center_y, $degrees, $img
777 777
778Rotates the image clockwise by C<$degrees> degrees, around the point at 778Rotates the image clockwise by C<$degrees> degrees, around the point at
779C<$center_x> and C<$center_y> (specified as factor of image width/height). 779C<$center_x> and C<$center_y> (specified as factor of image width/height).
780 780
781Example: rotate the image by 90 degrees around it's center. 781Example: rotate the image by 90 degrees around its center.
782 782
783 rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" } 783 rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" }
784 784
785=cut 785=cut
786 786
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817 817
818 sub tint($$) { 818 sub tint($$) {
819 $_[1]->tint ($_[0]) 819 $_[1]->tint ($_[0])
820 } 820 }
821 821
822=item shade $factor, $img
823
824Shade the image by the given factor.
825
826=cut
827
828 sub shade($$) {
829 $_[1]->shade ($_[0])
830 }
831
822=item contrast $factor, $img 832=item contrast $factor, $img
823 833
824=item contrast $r, $g, $b, $img 834=item contrast $r, $g, $b, $img
825 835
826=item contrast $r, $g, $b, $a, $img 836=item contrast $r, $g, $b, $a, $img
… …
885 $img 895 $img
886 } 896 }
887 897
888=item muladd $mul, $add, $img # EXPERIMENTAL 898=item muladd $mul, $add, $img # EXPERIMENTAL
889 899
890First multipliesthe pixels by C<$mul>, then adds C<$add>. This cna be used 900First multiplies the pixels by C<$mul>, then adds C<$add>. This can be used
891to implement brightness and contrast at the same time, with a wider value 901to implement brightness and contrast at the same time, with a wider value
892range than contrast and brightness operators. 902range than contrast and brightness operators.
893 903
894Due to numerous bugs in XRender implementations, it can also introduce a 904Due to numerous bugs in XRender implementations, it can also introduce a
895number of visual artifacts. 905number of visual artifacts.

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