40 lines
903 B
C
40 lines
903 B
C
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// THIS IS NOT ARDUINO CODE -- DON'T INCLUDE IN YOUR SKETCH. It's a
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// command-line tool that outputs a gamma correction table to stdout;
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// redirect or copy and paste the results into header file for the
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// RGBmatrixPanel library code.
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// Optional 1 parameter: bit depth (default=4, for 16 output levels).
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#include <stdio.h>
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#include <math.h>
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#define GAMMA 2.5
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int planes = 4;
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int main(int argc, char *argv[])
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{
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int i, maxval;
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if(argc > 1) planes = atoi(argv[1]);
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maxval = (1 << planes) - 1;
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(void)printf(
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"#ifndef _GAMMA_H_\n"
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"#define _GAMMA_H_\n\n"
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"#include <avr/pgmspace.h>\n\n"
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"static const uint8_t PROGMEM gamma[] = {\n ");
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for(i=0; i<256; i++) {
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(void)printf("0x%02x",(int)(pow((float)i / 255.0, GAMMA) *
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(float)maxval + 0.5));
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if(i < 255) (void)printf(((i & 7) == 7) ? ",\n " : ",");
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}
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(void)puts(
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"\n};\n\n"
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"#endif // _GAMMA_H_");
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return 0;
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}
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