/usr/lib/pd/extra/Gem/gemhead-help.pd is in gem 1:0.93.3-5ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | #N canvas 20 14 913 610 10;
#X text 52 365 Any gem object can be connected after the gemhead and
it will receive the render command.;
#X text 47 294 gemhead connects the gem objects to the window manager.
The start of any gemList begins with the gemhead. Without the gemhead
\, gem objects will not receive the render command.;
#X text 217 12 gemhead;
#X text 50 399 If gemhead receives a bang \, it will execute render.
This is useful for a single buffered window when you want to control
when things are rendered.;
#X text 45 468 gemhead also accepts a 1 or 0 to enable and disable
rendering for the chain.;
#X text 474 386 you can dynamically set this value via the "set" message
;
#X obj 337 528 cnv 15 140 65 empty empty empty 20 12 0 14 -195568 -66577
0;
#X msg 352 548 create;
#X text 348 527 Create window:;
#N canvas 0 0 450 300 gemwin 0;
#X obj 132 136 gemwin;
#X obj 67 89 outlet;
#X obj 67 10 inlet;
#X obj 67 41 route create;
#X msg 67 70 set destroy;
#X msg 142 68 set create;
#X msg 132 93 create \, 1 \, frame 2;
#X msg 198 112 destroy \, reset;
#X connect 2 0 3 0;
#X connect 3 0 4 0;
#X connect 3 0 6 0;
#X connect 3 1 5 0;
#X connect 3 1 7 0;
#X connect 4 0 1 0;
#X connect 5 0 1 0;
#X connect 6 0 0 0;
#X connect 7 0 0 0;
#X restore 352 568 pd gemwin (2fps);
#X obj 42 37 cnv 15 200 240 empty empty empty 20 12 0 14 -233017 -66577
0;
#X text 51 42 enable/disable rendering;
#X obj 71 86 cnv 15 100 40 empty empty empty 20 12 0 14 -24198 -66577
0;
#X msg 90 203 gemList;
#X obj 90 97 gemhead;
#X msg 90 64 1;
#X msg 126 64 0;
#X obj 90 244 print ENABLE;
#X obj 90 141 translate 2 -1 0 0;
#X obj 90 162 square 0.5;
#X obj 285 34 cnv 15 200 240 empty empty empty 20 12 0 14 -233017 -66577
0;
#X obj 528 32 cnv 15 200 240 empty empty empty 20 12 0 14 -233017 -66577
0;
#X text 316 35 force rendering;
#X text 547 37 set rendering order;
#X obj 326 88 cnv 15 100 40 empty empty empty 20 12 0 14 -24198 -66577
0;
#X obj 559 93 cnv 15 100 40 empty empty empty 20 12 0 14 -24198 -66577
0;
#X msg 335 55 bang;
#X msg 569 59 set 45;
#X msg 632 61 set 55;
#X obj 569 244 print SETTABLE;
#X obj 335 244 print FORCEABLE;
#X obj 335 98 gemhead 50;
#X obj 569 102 gemhead 55;
#X obj 335 141 translate 2 0 1 0;
#X msg 335 203 gemList;
#X msg 569 203 gemList;
#X obj 569 141 translate 2 1 0 0;
#X obj 335 162 circle 0.5;
#X obj 569 162 triangle 0.5;
#X text 469 288 gemhead takes an argument to determine when it receives
the render command. The default value is 50 The lower the value is
\, the sooner the gemhead will receive the rendering command (a value
of 1 is the lowest possible value (see below)). This value becomes
important when you are doing alpha blending and for certain objects
(such as light).;
#X text 469 495 example: "1" before "50" before "-10" before "-23"
;
#X text 470 416 the rendering-order value can also be negative. Negative
numbered [gemhead]s will be rendered AFTER all positive [gemhead]s.
Note \, that Higher values (-3) will be rendered BEFORE lower values
(-10). [gemhead]s with negative numbers will NOT be affected by view-point
changes !!!;
#X connect 7 0 9 0;
#X connect 9 0 7 0;
#X connect 13 0 17 0;
#X connect 14 0 18 0;
#X connect 15 0 14 0;
#X connect 16 0 14 0;
#X connect 18 0 19 0;
#X connect 19 0 13 0;
#X connect 26 0 31 0;
#X connect 27 0 32 0;
#X connect 28 0 32 0;
#X connect 31 0 33 0;
#X connect 32 0 36 0;
#X connect 33 0 37 0;
#X connect 34 0 30 0;
#X connect 35 0 29 0;
#X connect 36 0 38 0;
#X connect 37 0 34 0;
#X connect 38 0 35 0;
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