[Cin] Some tests on blending

[Andrea paz]

@Georgy
I wanted to try Blend Program, as you suggested, to check the various
color plugins. The first one, “solid_red.bp” works fine. The second,
“print_hdr.bp” does not work and the terminal shows errors that I do
not understand. I don't even know how to declare a variable, although
in the first function I don't have this problem. I attach the two
functions and report the error on the terminal:


"BlendProgramCompile: executing gcc -fPIC -O2 -shared -o
/home/paz/.bcast5lib/dlfcn/bp/print_hdr.bp.so
/home/paz/.bcast5lib/dlfcn/bp/print_hdr.bp.c -lm
/home/paz/.bcast5lib/dlfcn/bp/print_hdr.bp: In function ‘bpProc’:
/home/paz/.bcast5lib/dlfcn/bp/print_hdr.bp:11:8: error: ‘R’ undeclared
(first use in this function)
   11 | printf(R);
      |        ^
/home/paz/.bcast5lib/dlfcn/bp/print_hdr.bp:11:8: note: each undeclared
identifier is reported only once for each function it appears in
virtual int BlendProgram::process_buffer(VFrame**, int64_t, double):
Blend Program: compilation of program .bcast5lib/dlfcn/bp/print_hdr.bp failed
see console printout for diagnostics"


I tried with:
printf(R(0));
printf(R(i));
printf(R);

Always with a similar error.
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