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Revision 1.140 by sasha, Fri Oct 26 18:27:29 2007 UTC vs.
Revision 1.161 by ayin, Sat Jan 26 14:24:42 2008 UTC

12emulator intended as an I<xterm>(1) replacement for users who do not 12emulator intended as an I<xterm>(1) replacement for users who do not
13require features such as Tektronix 4014 emulation and toolkit-style 13require features such as Tektronix 4014 emulation and toolkit-style
14configurability. As a result, B<rxvt-unicode> uses much less swap space -- 14configurability. As a result, B<rxvt-unicode> uses much less swap space --
15a significant advantage on a machine serving many X sessions. 15a significant advantage on a machine serving many X sessions.
16 16
17This document is also available on the World-Wide-Web at
18L<http://pod.tst.eu/http://cvs.schmorp.de/rxvt-unicode/doc/rxvt.1.pod>.
19
17=head1 FREQUENTLY ASKED QUESTIONS 20=head1 FREQUENTLY ASKED QUESTIONS
18 21
19See @@RXVT_NAME@@(7) (try C<man 7 @@RXVT_NAME@@>) for a list of 22See @@RXVT_NAME@@(7) (try C<man 7 @@RXVT_NAME@@>) for a list of
20frequently asked questions and answer to them and some common 23frequently asked questions and answer to them and some common
21problems. That document is also accessible on the World-Wide-Web at 24problems. That document is also accessible on the World-Wide-Web at
22L<http://cvs.schmorp.de/browse/rxvt-unicode/doc/rxvt.7.html>. 25L<http://pod.tst.eu/http://cvs.schmorp.de/rxvt-unicode/doc/rxvt.7.pod>.
23 26
24=head1 RXVT-UNICODE VS. RXVT 27=head1 RXVT-UNICODE VS. RXVT
25 28
26Unlike the original rxvt, B<rxvt-unicode> stores all text in Unicode 29Unlike the original rxvt, B<rxvt-unicode> stores all text in Unicode
27internally. That means it can store and display most scripts in the 30internally. That means it can store and display most scripts in the
30like mongolian or scripts requiring extremely complex combining rules, 33like mongolian or scripts requiring extremely complex combining rules,
31like tibetan or devanagari. Don't expect pretty output when using these 34like tibetan or devanagari. Don't expect pretty output when using these
32scripts. Most other scripts, latin, cyrillic, kanji, thai etc. should work 35scripts. Most other scripts, latin, cyrillic, kanji, thai etc. should work
33fine, though. A somewhat difficult case are right-to-left scripts, such 36fine, though. A somewhat difficult case are right-to-left scripts, such
34as hebrew: B<rxvt-unicode> adopts the view that bidirectional algorithms 37as hebrew: B<rxvt-unicode> adopts the view that bidirectional algorithms
35belong into the application, not the terminal emulator (too many things -- 38belong in the application, not the terminal emulator (too many things --
36such as cursor-movement while editing -- break otherwise), but that might 39such as cursor-movement while editing -- break otherwise), but that might
37change. 40change.
38 41
39If you are looking for a terminal that supports more exotic scripts, let 42If you are looking for a terminal that supports more exotic scripts, let
40me recommend C<mlterm>, which is a very user friendly, lean and clean 43me recommend C<mlterm>, which is a very user friendly, lean and clean
98=item B<-depth> I<bitdepth> 101=item B<-depth> I<bitdepth>
99 102
100Compile I<xft>: Attempt to find a visual with the given bit depth; 103Compile I<xft>: Attempt to find a visual with the given bit depth;
101resource B<depth>. 104resource B<depth>.
102 105
106[Please note that many X servers (and libXft) are buggy with
107respect to C<-depth 32> and/or alpha channels, and will cause all sorts
108of graphical corruption. This is harmless, but we can't do anything about
109this, so watch out]
110
103=item B<-geometry> I<geom> 111=item B<-geometry> I<geom>
104 112
105Window geometry (B<-g> still respected); resource B<geometry>. 113Window geometry (B<-g> still respected); resource B<geometry>.
106 114
107=item B<-rv>|B<+rv> 115=item B<-rv>|B<+rv>
116 124
117Turn on/off skip scrolling (allow multiple screens per refresh); resource B<skipScroll>. 125Turn on/off skip scrolling (allow multiple screens per refresh); resource B<skipScroll>.
118 126
119=item B<-tr>|B<+tr> 127=item B<-tr>|B<+tr>
120 128
121Turn on/off illusion of a transparent window background. Obsolete form of it is 129Turn on/off illusion of a transparent window background; resource B<transparent>.
122B<-ip> and it should not be used anymore; resource B<transparent>.
123 130
124I<Please note that old resource name of B<inheritPixmap> is obsolete and should be 131B<-ip> is still accepted as an obsolete alias but will be removed in
125changed to B<transparent>. Backwards compatibility support for B<inheritPixmap> will 132future versions.
126be phased out in future versions of rxvt!>
127 133
128I<Please address all transparency related issues to Sasha Vasko at 134I<Please address all transparency related issues to Sasha Vasko at
129sasha@aftercode.net. Read the FAQ (man 7 @@RXVT_NAME@@)!> 135sasha@aftercode.net. Read the FAQ (man 7 @@RXVT_NAME@@)!>
130 136
131=item B<-fade> I<number> 137=item B<-fade> I<number>
132 138
133Fade the text by the given percentage when focus is lost. Small values 139Fade the text by the given percentage when focus is lost. Small values
145transparency is enabled with B<-tr>. This only works for 151transparency is enabled with B<-tr>. This only works for
146non-tiled backgrounds, currently. See also the B<-sh> option that can be 152non-tiled backgrounds, currently. See also the B<-sh> option that can be
147used to brighten or darken the image in addition to tinting it. 153used to brighten or darken the image in addition to tinting it.
148Please note that certain tint colours can be applied on the server-side, 154Please note that certain tint colours can be applied on the server-side,
149thus yielding performance gain of two orders of magnitude. These colours are: 155thus yielding performance gain of two orders of magnitude. These colours are:
150blue, red, green, cyan, magenta, yellow, and those close to them; resource 156blue, red, green, cyan, magenta, yellow, and those close to them. Also
157pure black and pure white colors essentially mean no tinting; resource
151I<tintColor>. Example: 158I<tintColor>. Example:
152 159
153 @@RXVT_NAME@@ -tr -tint blue -sh 40 160 @@RXVT_NAME@@ -tr -tint blue -sh 40
154 161
155=item B<-sh> I<number> 162=item B<-sh> I<number>
156 163
157Darken (0 .. 100) or lighten (-1 .. -100) the transparent 164Darken (0 .. 100) or lighten (100 .. 200) the transparent
158background image in addition to (or instead of) tinting it; 165background image in addition to (or instead of) tinting it;
159resource I<shading>. 166resource I<shading>.
160 167
161=item B<-blt> I<string> 168=item B<-blt> I<string>
162 169
183 190
184=item B<-fg> I<colour> 191=item B<-fg> I<colour>
185 192
186Window foreground colour; resource B<foreground>. 193Window foreground colour; resource B<foreground>.
187 194
188=item B<-pixmap> I<file[;geom]> 195=item B<-pixmap> I<file[;geom[:op1][:op2][...]]>
189 196
190Compile I<afterimage>: Specify image file for the background and also 197Compile I<afterimage>: Specify image file for the background and also
191optionally specify its scaling with a geometry string. Note you may need to 198optionally specify its scaling with a geometry string. Note you may need to
192add quotes to avoid special shell interpretation of the C<;> in the 199add quotes to avoid special shell interpretation of the C<;> in the
193command-line; for more details see resource B<backgroundPixmap>. 200command-line; for more details see resource B<backgroundPixmap>.
194 201
195=item B<-cr> I<colour> 202=item B<-cr> I<colour>
243italic> >> characters are to be printed. See resource B<boldItalicFont> 250italic> >> characters are to be printed. See resource B<boldItalicFont>
244for details. 251for details.
245 252
246=item B<-is>|B<+is> 253=item B<-is>|B<+is>
247 254
248Compile I<font-styles>: Bold/Italic font styles imply high intensity 255Compile I<font-styles>: Bold/Blink font styles imply high intensity
249foreground/background (default). See resource B<intensityStyles> for 256foreground/background (default). See resource B<intensityStyles> for
250details. 257details.
251 258
252=item B<-name> I<name> 259=item B<-name> I<name>
253 260
271 278
272=item B<-sb>|B<+sb> 279=item B<-sb>|B<+sb>
273 280
274Turn on/off scrollbar; resource B<scrollBar>. 281Turn on/off scrollbar; resource B<scrollBar>.
275 282
283=item B<-sr>|B<+sr>
284
285Put scrollbar on right/left; resource B<scrollBar_right>.
286
287=item B<-st>|B<+st>
288
289Display rxvt (non XTerm/NeXT) scrollbar without/with a trough;
290resource B<scrollBar_floating>.
291
276=item B<-si>|B<+si> 292=item B<-si>|B<+si>
277 293
278Turn on/off scroll-to-bottom on TTY output inhibit; resource 294Turn on/off scroll-to-bottom on TTY output inhibit; resource
279B<scrollTtyOutput> has opposite effect. 295B<scrollTtyOutput> has opposite effect.
280 296
286=item B<-sw>|B<+sw> 302=item B<-sw>|B<+sw>
287 303
288Turn on/off scrolling with the scrollback buffer as new lines appear. 304Turn on/off scrolling with the scrollback buffer as new lines appear.
289This only takes effect if B<-si> is also given; resource 305This only takes effect if B<-si> is also given; resource
290B<scrollWithBuffer>. 306B<scrollWithBuffer>.
291
292=item B<-sr>|B<+sr>
293
294Put scrollbar on right/left; resource B<scrollBar_right>.
295
296=item B<-st>|B<+st>
297
298Display rxvt (non XTerm/NeXT) scrollbar without/with a trough;
299resource B<scrollBar_floating>.
300 307
301=item B<-ptab>|B<+ptab> 308=item B<-ptab>|B<+ptab>
302 309
303If enabled (default), "Horizontal Tab" characters are being stored as 310If enabled (default), "Horizontal Tab" characters are being stored as
304actual wide characters in the screen buffer, which makes it possible to 311actual wide characters in the screen buffer, which makes it possible to
416 423
417=item B<-tcw> 424=item B<-tcw>
418 425
419Change the meaning of triple-click selection with the left mouse 426Change the meaning of triple-click selection with the left mouse
420button. Only effective when the original (non-perl) selection code is 427button. Only effective when the original (non-perl) selection code is
421in-use. Instead of selecting a full line it will extend the selection the 428in-use. Instead of selecting a full line it will extend the selection to
422end of the logical line only. resource B<tripleclickwords>. 429the end of the logical line only. resource B<tripleclickwords>.
423 430
424=item B<-insecure> 431=item B<-insecure>
425 432
426Enable "insecure" mode, which currently enables most of the escape 433Enable "insecure" mode, which currently enables most of the escape
427sequences that echo strings. See the resource B<insecure> for more 434sequences that echo strings. See the resource B<insecure> for more
447 454
448Turn on/off hold window after exit support. If enabled, @@RXVT_NAME@@ 455Turn on/off hold window after exit support. If enabled, @@RXVT_NAME@@
449will not immediately destroy its window when the program executed within 456will not immediately destroy its window when the program executed within
450it exits. Instead, it will wait till it is being killed or closed by the 457it exits. Instead, it will wait till it is being killed or closed by the
451user; resource B<hold>. 458user; resource B<hold>.
459
460=item B<-xrm> I<string>
461
462Works like the X Toolkit option of the same name, by adding the I<string>
463as if it were specified in a resource file. Resource values specified this
464way take precedence over all other resource specifications.
465
466Note that you need to use the I<same> syntax as in the .Xdefaults file,
467e.g. C<*.background: black>. Also note that all @@RXVT_NAME@@-specific
468options can be specified as long-options on the commandline, so use
469of B<-xrm> is mostly limited to cases where you want to specify other
470resources (e.g. for input methods) or for compatibility with other
471programs.
452 472
453=item B<-keysym.>I<sym> I<string> 473=item B<-keysym.>I<sym> I<string>
454 474
455Remap a key symbol. See resource B<keysym>. 475Remap a key symbol. See resource B<keysym>.
456 476
491If this switch is given, @@RXVT_NAME@@ will not create any utmp/wtmp 511If this switch is given, @@RXVT_NAME@@ will not create any utmp/wtmp
492entries and will not tinker with pty/tty permissions - you have to do that 512entries and will not tinker with pty/tty permissions - you have to do that
493yourself if you want that. 513yourself if you want that.
494 514
495As an extremely special case, specifying C<-1> will completely suppress 515As an extremely special case, specifying C<-1> will completely suppress
496pty/tty operations. 516pty/tty operations, which is probably only useful in conjunction with some
517perl extension that manages the terminal.
497 518
498Here is a example in perl that illustrates how this option can be used (a 519Here is a example in perl that illustrates how this option can be used (a
499longer example is in F<doc/pty-fd>): 520longer example is in F<doc/pty-fd>):
500 521
501 use IO::Pty; 522 use IO::Pty;
515Comma-separated list of perl extension scripts to use (or not to use) in 536Comma-separated list of perl extension scripts to use (or not to use) in
516this terminal instance. See resource B<perl-ext> for details. 537this terminal instance. See resource B<perl-ext> for details.
517 538
518=back 539=back
519 540
520=head1 RESOURCES (available also as long-options) 541=head1 RESOURCES
521 542
522Note: `@@RXVT_NAME@@ --help' gives a list of all resources (long 543Note: `@@RXVT_NAME@@ --help' gives a list of all resources (long
523options) compiled into your version. 544options) compiled into your version. All resources are also available as
545long-options.
524 546
525You can set and change the resources using X11 tools like B<xrdb>. Many 547You can set and change the resources using X11 tools like B<xrdb>. Many
526distribution do also load settings from the B<~/.Xresources> file when X 548distribution do also load settings from the B<~/.Xresources> file when X
527starts. @@RXVT_NAME@@ will consult the following files/resources in order, 549starts. @@RXVT_NAME@@ will consult the following files/resources in order,
528with later settings overwriting earlier ones: 550with later settings overwriting earlier ones:
530 1. system-wide app-defaults file, either locale-dependent OR global 552 1. system-wide app-defaults file, either locale-dependent OR global
531 2. app-defaults file in $XAPPLRESDIR 553 2. app-defaults file in $XAPPLRESDIR
532 3. RESOURCE_MANAGER property on root-window OR $HOME/.Xdefaults 554 3. RESOURCE_MANAGER property on root-window OR $HOME/.Xdefaults
533 4. SCREEN_RESOURCES for the current screen 555 4. SCREEN_RESOURCES for the current screen
534 5. $XENVIRONMENT file OR $HOME/.Xdefaults-<nodename> 556 5. $XENVIRONMENT file OR $HOME/.Xdefaults-<nodename>
557 6. resources specified via -xrm on the commandline
535 558
536Note that when reading X resources, B<@@RXVT_NAME@@> recognizes two class 559Note that when reading X resources, B<@@RXVT_NAME@@> recognizes two class
537names: B<Rxvt> and B<URxvt>. The class name B<Rxvt> allows resources 560names: B<Rxvt> and B<URxvt>. The class name B<Rxvt> allows resources
538common to both B<@@RXVT_NAME@@> and the original I<rxvt> to be easily 561common to both B<@@RXVT_NAME@@> and the original I<rxvt> to be easily
539configured, while the class name B<URxvt> allows resources unique to 562configured, while the class name B<URxvt> allows resources unique to
549=item B<depth:> I<bitdepth> 572=item B<depth:> I<bitdepth>
550 573
551Compile I<xft>: Attempt to find a visual with the given bit depth; 574Compile I<xft>: Attempt to find a visual with the given bit depth;
552option B<-depth>. 575option B<-depth>.
553 576
577=item B<buffered:> I<boolean>
578
579Compile I<xft>: Turn on/off double-buffering for xft (default enabled).
580On some card/driver combination enabling it slightly decreases
581performance, on most it greatly helps it. The slowdown is small, so it
582should normally be enabled.
583
554=item B<geometry:> I<geom> 584=item B<geometry:> I<geom>
555 585
556Create the window with the specified X window geometry [default 80x24]; 586Create the window with the specified X window geometry [default 80x24];
557option B<-geometry>. 587option B<-geometry>.
558 588
641 671
642B<False>: specify that everything is to be displayed, even 672B<False>: specify that everything is to be displayed, even
643if the refresh is too fast for the human eye to read anything (or the 673if the refresh is too fast for the human eye to read anything (or the
644monitor to display anything); option B<+ss>. 674monitor to display anything); option B<+ss>.
645 675
646=item B<inheritPixmap:> I<boolean> 676=item B<transparent:> I<boolean>
647 677
648B<True>: make the background inherit the parent windows' pixmap, giving 678Turn on/off illusion of a transparent window background.
649artificial transparency. B<False>: do not inherit the parent windows'
650pixmap.
651 679
652I<Please note that transparency of any kind if completely unsupported by 680B<inheritPixmap> is still accepted as an obsolete alias but will be removed in
653the author. Don't bug him with installation questions!> 681future versions.
682
683I<Please address all transparency related issues to Sasha Vasko at
684sasha@aftercode.net. Read the FAQ (man 7 @@RXVT_NAME@@)!>
654 685
655=item B<fading:> I<number> 686=item B<fading:> I<number>
656 687
657Fade the text by the given percentage when focus is lost; option B<-fade>. 688Fade the text by the given percentage when focus is lost; option B<-fade>.
658 689
675 706
676Specify background blending type; option B<-blt>. 707Specify background blending type; option B<-blt>.
677 708
678=item B<blurRadius:> I<number> 709=item B<blurRadius:> I<number>
679 710
680Apply Gaussian Blurr with the specified radius to the transparent 711Apply Gaussian Blurr with the specified radius to the transparent
681background image; option B<-blr>. 712background image; option B<-blr>.
682 713
683=item B<scrollColor:> I<colour> 714=item B<scrollColor:> I<colour>
684 715
685Use the specified colour for the scrollbar [default #B2B2B2]. 716Use the specified colour for the scrollbar [default #B2B2B2].
692=item B<borderColor:> I<colour> 723=item B<borderColor:> I<colour>
693 724
694The colour of the border around the text area and between the scrollbar 725The colour of the border around the text area and between the scrollbar
695and the text. 726and the text.
696 727
697=item B<backgroundPixmap:> I<file[;geom]> 728=item B<backgroundPixmap:> I<file[;geom[:op1][:op2][...]]>
698 729
699Use the specified image file for the background and also optionally 730Use the specified image file for the background and also
700specify its scaling with a geometry string B<WxH+X+Y>, 731optionally specify its scaling with a geometry string B<WxH+X+Y>,
701in which B<"W" / "H"> specify the horizontal/vertical scale (percent), 732(default C<0x0+50+50>) in which B<"W" / "H"> specify the
702and B<"X" / "Y"> locate the image centre (percent). 733horizontal/vertical scale (percent), and B<"X" / "Y"> locate the image
703A scale of 0 displays the image with tiling. A scale of 1 displays the 734centre (percent). A scale of 0 displays the image with tiling. A scale
704image without any scaling. A scale of 2 to 9 specifies an integer 735of 1 displays the image without any scaling. A scale of 2 to 9 specifies
705number of images in that direction. No image will be magnified beyond 736an integer number of images in that direction. No image will be magnified
70610 times its original size. The maximum permitted scale is 1000. 737beyond 10 times its original size. The maximum permitted scale is 1000.
707Special string of B<"auto"> used as a geometry will cause image to be 738Additional operations can be specified after colon B<:op1:op2...>.
708automatically scaled to match window size. 739Supported operations are:
740
741 tile force background image to be tiled and not scaled. Equivalent to 0x0
742 propscale will scale image keeping proportions
743 auto will scale image to match window size. Equivalent to 100x100
744 hscale will scale image horizontally to the window size
745 vscale will scale image vertically to the window size
746 scale will scale image to match window size
747 root will tile image as if it was a root window background, auto-adjusting
748 whenever terminal window moves
749
709If used in conjunction with B<-tr> option - specified pixmap will be 750If used in conjunction with B<-tr> option, the specified pixmap will be
710blended over transparency image using either alpha-blending, or any 751blended over transparency image using either alpha-blending, or any
711other blending type, specified with B<-blt "type"> option. 752other blending type, specified with B<-blt "type"> option.
712[default 0x0+50+50]
713 753
714=item B<path:> I<path> 754=item B<path:> I<path>
715 755
716Specify the colon-delimited search path for finding background image files. 756Specify the colon-delimited search path for finding background image files.
717 757
778text font will being used for the given style. 818text font will being used for the given style.
779 819
780=item B<intensityStyles:> I<boolean> 820=item B<intensityStyles:> I<boolean>
781 821
782When font styles are not enabled, or this option is enabled (B<True>, 822When font styles are not enabled, or this option is enabled (B<True>,
783option B<-is>, the default), bold and italic font styles imply high 823option B<-is>, the default), bold/blink font styles imply high
784intensity foreground/background colours. Disabling this option (B<False>, 824intensity foreground/background colours. Disabling this option (B<False>,
785option B<+is>) disables this behaviour, the high intensity colours are not 825option B<+is>) disables this behaviour, the high intensity colours are not
786reachable. 826reachable.
787 827
788=item B<selectstyle:> I<mode>
789
790Set mouse selection style to B<old> which is 2.20, B<oldword> which
791is xterm style with 2.20 old word selection, or anything else which
792gives xterm style selection. Only effective when the original (non-perl)
793selection code is in use.
794
795=item B<scrollstyle:> I<mode>
796
797Set scrollbar style to B<rxvt>, B<plain>, B<next> or B<xterm>. B<plain> is
798the author's favourite.
799
800=item B<title:> I<string> 828=item B<title:> I<string>
801 829
802Set window title string, the default title is the command-line 830Set window title string, the default title is the command-line
803specified after the B<-e> option, if any, otherwise the application 831specified after the B<-e> option, if any, otherwise the application
804name; option B<-title>. 832name; option B<-title>.
848 876
849 URxvt.print-pipe: cat > $(TMPDIR=$HOME mktemp urxvt.XXXXXX) 877 URxvt.print-pipe: cat > $(TMPDIR=$HOME mktemp urxvt.XXXXXX)
850 878
851This creates a new file in your home directory with the screen contents 879This creates a new file in your home directory with the screen contents
852every time you hit C<Print>. 880every time you hit C<Print>.
881
882=item B<scrollstyle:> I<mode>
883
884Set scrollbar style to B<rxvt>, B<plain>, B<next> or B<xterm>. B<plain> is
885the author's favourite.
853 886
854=item B<scrollBar:> I<boolean> 887=item B<scrollBar:> I<boolean>
855 888
856B<True>: enable the scrollbar [default]; option B<-sb>. B<False>: 889B<True>: enable the scrollbar [default]; option B<-sb>. B<False>:
857disable the scrollbar; option B<+sb>. 890disable the scrollbar; option B<+sb>.
990will be created). In this mode, characters outside ISO-8859-1 can be used. 1023will be created). In this mode, characters outside ISO-8859-1 can be used.
991 1024
992When the selection extension is not used, only ISO-8859-1 characters can 1025When the selection extension is not used, only ISO-8859-1 characters can
993be used. If not specified, the built-in default is used: 1026be used. If not specified, the built-in default is used:
994 1027
995B<< BACKSLASH `"'&()*,;<=>?@[]{|} >> 1028B<< BACKSLASH `"'&()*,;<=>?@[]^{|} >>
996 1029
997=item B<preeditType:> I<style> 1030=item B<preeditType:> I<style>
998 1031
999B<OverTheSpot>, B<OffTheSpot>, B<Root>; option B<-pt>. 1032B<OverTheSpot>, B<OffTheSpot>, B<Root>; option B<-pt>.
1000 1033
1435=back 1468=back
1436 1469
1437=head2 ALPHA CHANNEL SUPPORT 1470=head2 ALPHA CHANNEL SUPPORT
1438 1471
1439If Xft support has been compiled in and as long as Xft/Xrender/X don't get 1472If Xft support has been compiled in and as long as Xft/Xrender/X don't get
1440their act together, rxvt-unicode will support C<rgba:rrrr/gggg/bbbb/aaaa> 1473their act together, rxvt-unicode will do it's own alpha channel management:
1441(recommended, but B<MUST> have 4 digits/component) colour specifications, 1474
1442in addition to the ones provided by X, where the additional A component 1475You can prefix any color with an opaquenes percentage enclosed in
1476brackets, i.e. C<[percent]>, where C<percent> is a decimal percentage
1477(0-100) that specifies the opacity of the color, where C<0> is completely
1478transparent and C<100> is completely opaque. For example, C<[50]red> is a
1479half-transparent red, while C<[95]#00ff00> is an almost opaque green. This
1480is the recommended format to specify transparency values, and works with
1481all ways to specify a colour.
1482
1483For complete control, rxvt-unicode also supports
1484C<rgba:rrrr/gggg/bbbb/aaaa> (exactly four hex digits/component) colour
1485specifications, where the additional C<aaaa> component specifies opacity
1443specifies opacity (alpha) values. The minimum value of C<0> is completely 1486(alpha) values. The minimum value of C<0000> is completely transparent,
1444transparent). You can also prefix any color with C<[percent]>, where 1487while C<ffff> is completely opaque). The two example colours from
1445C<percent> is a decimal percentage (0-100) that specifies the opacity of 1488earlier could also be specified as C<rgba:ff00/0000/0000/8000> and
1446the color, where C<0> is completely transparent and C<100> is completelxy 1489C<rgba:0000/ff00/0000/f332>.
1447opaque.
1448 1490
1449You probably need to specify B<"-depth 32">, too, and have the luck that 1491You probably need to specify B<"-depth 32">, too, to force a visual with
1450your X-server uses ARGB pixel layout, as X is far from just supporting 1492alpha channels, and have the luck that your X-server uses ARGB pixel
1451ARGB visuals out of the box, and rxvt-unicode just fudges around. 1493layout, as X is far from just supporting ARGB visuals out of the box, and
1494rxvt-unicode just fudges around.
1452 1495
1453For example, the following selects an almost completely transparent red 1496For example, the following selects an almost completely transparent black
1454background, and an almost opaque pink foreground: 1497background, and an almost opaque pink foreground:
1455 1498
1456 @@RXVT_NAME@@ -depth 32 -bg rgba:0000/0000/0000/aaaa -fg "[80]pink" 1499 @@RXVT_NAME@@ -depth 32 -bg rgba:0000/0000/0000/4444 -fg "[80]pink"
1457 1500
1458I<Please note that transparency of any kind if completely unsupported by 1501When not using a background image, then the interpretation of the
1459the author. Don't bug him with installation questions!> 1502alpha channel is up to your compositing manager (most interpret it as
1503transparency of course).
1504
1505When using a background pixmap or pseudo-transparency, then the background
1506colour will always behave as if it were completely transparent (so the
1507background image shows instead), regardless of how it was specified, while
1508other colours will either be transparent as specified (the background
1509image will show through) on servers supporting the RENDER extension, or
1510fully opaque on servers not supporting the RENDER EXTENSION.
1511
1512Please note that due to bugs in Xft, specifying alpha values might result
1513in garbage being displayed when the X-server does not support the RENDER
1514extension.
1460 1515
1461=head1 ENVIRONMENT 1516=head1 ENVIRONMENT
1462 1517
1463B<@@RXVT_NAME@@> sets and/or uses the following environment variables: 1518B<@@RXVT_NAME@@> sets and/or uses the following environment variables:
1464 1519
1470resources or on the command line. 1525resources or on the command line.
1471 1526
1472=item B<COLORTERM> 1527=item B<COLORTERM>
1473 1528
1474Either C<rxvt>, C<rxvt-xpm>, depending on whether @@RXVT_NAME@@ was 1529Either C<rxvt>, C<rxvt-xpm>, depending on whether @@RXVT_NAME@@ was
1475compiled with background image support, and optionally with the added 1530compiled with background image support, and optionally with the added
1476extension C<-mono> to indicate that rxvt-unicode runs on a monochrome 1531extension C<-mono> to indicate that rxvt-unicode runs on a monochrome
1477screen. 1532screen.
1478 1533
1479=item B<COLORFGBG> 1534=item B<COLORFGBG>
1480 1535
1481Set to a string of the form C<fg;bg> or C<fg;xpm;bg>, where C<fg> is 1536Set to a string of the form C<fg;bg> or C<fg;xpm;bg>, where C<fg> is
1482the colour code used as default foreground/text colour (or the string 1537the colour code used as default foreground/text colour (or the string
1483C<default> to indicate that the default-colour escape sequence is to be 1538C<default> to indicate that the default-colour escape sequence is to be
1484used), C<bg> is the colour code used as default background colour (or the 1539used), C<bg> is the colour code used as default background colour (or the
1485string C<default>), and C<xpm> is the string C<default> if @@RXVT_NAME@@ 1540string C<default>), and C<xpm> is the string C<default> if @@RXVT_NAME@@
1486was compiled with background image support. Libraries like C<ncurses> 1541was compiled with background image support. Libraries like C<ncurses>
1487and C<slang> can (and do) use this information to optimize screen output. 1542and C<slang> can (and do) use this information to optimize screen output.
1488 1543
1489=item B<WINDOWID> 1544=item B<WINDOWID>
1490 1545
1491Set to the (decimal) X Window ID of the @@RXVT_NAME@@ window (the toplevel 1546Set to the (decimal) X Window ID of the @@RXVT_NAME@@ window (the toplevel
1583Project Coordinator (changes.txt 2.21a to 2.4.5) 1638Project Coordinator (changes.txt 2.21a to 2.4.5)
1584 1639
1585=item Geoff Wing L<< <gcw@pobox.com> >> 1640=item Geoff Wing L<< <gcw@pobox.com> >>
1586 1641
1587Rewrote screen display and text selection routines. 1642Rewrote screen display and text selection routines.
1588 1643
1589Project Coordinator (changes.txt 2.4.6 - rxvt-unicode) 1644Project Coordinator (changes.txt 2.4.6 - rxvt-unicode)
1590 1645
1591=item Marc Alexander Lehmann L<< <rxvt-unicode@schmorp.de> >> 1646=item Marc Alexander Lehmann L<< <rxvt-unicode@schmorp.de> >>
1592 1647
1593Forked rxvt-unicode, unicode support, rewrote almost all the code, perl 1648Forked rxvt-unicode, unicode support, rewrote almost all the code, perl

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