28612cadd8
- Add HandleDestroy stub function - Update HSVtoHEX function to RGBA - Start moving over to CNFGColor()
111 lines
1.8 KiB
C
111 lines
1.8 KiB
C
//Copyright (Public Domain) 2015 <>< Charles Lohr, under the NewBSD License.
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//This file may be used in whole or part in any way for any purpose by anyone
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//without restriction.
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#include "color.h"
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#include <math.h>
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uint32_t CCtoHEX( float note, float sat, float value )
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{
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float hue = 0.0;
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note = fmodf( note, 1.0 );
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note *= 12.0;
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if( note < 4.0 )
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{
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//Needs to be YELLOW->RED
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hue = (4.0 - note) / 24.0;
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}
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else if( note < 8.0 )
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{
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// [4] [8]
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//Needs to be RED->BLUE
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hue = ( 4.0 - note ) / 12.0;
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}
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else
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{
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// [8] [12]
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//Needs to be BLUE->YELLOW
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hue = ( 12.0 - note ) / 8.0 + 1.0/6.0;
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}
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return HSVtoHEX( hue, sat, value );
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}
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//0/6: RED
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//1/6: YELLOW
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//2/6: GREEN
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//3/6: CYAN
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//4/6: BLUE
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//5/6: PURPLE
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//6/6: RED
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uint32_t HSVtoHEX( float hue, float sat, float value )
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{
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float pr = 0.0;
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float pg = 0.0;
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float pb = 0.0;
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short ora = 0.0;
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short og = 0.0;
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short ob = 0.0;
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float ro = fmod( hue * 6.0, 6.0 );
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float avg = 0.0;
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ro = fmod( ro + 6.0 + 1.0, 6.0 ); //Hue was 60* off...
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if( ro < 1.0 ) //yellow->red
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{
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pr = 1.0;
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pg = 1.0 - ro;
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} else if( ro < 2.0 )
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{
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pr = 1.0;
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pb = ro - 1.0;
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} else if( ro < 3.0 )
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{
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pr = 3.0 - ro;
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pb = 1.0;
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} else if( ro < 4.0 )
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{
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pb = 1.0;
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pg = ro - 3.0;
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} else if( ro < 5.0 )
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{
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pb = 5.0 - ro;
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pg = 1.0;
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} else
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{
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pg = 1.0;
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pr = ro - 5.0;
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}
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//Actually, above math is backwards, oops!
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pr *= value;
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pg *= value;
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pb *= value;
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avg += pr;
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avg += pg;
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avg += pb;
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pr = pr * sat + avg * (1.0-sat);
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pg = pg * sat + avg * (1.0-sat);
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pb = pb * sat + avg * (1.0-sat);
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ora = pr * 255;
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og = pb * 255;
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ob = pg * 255;
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if( ora < 0 ) ora = 0;
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if( ora > 255 ) ora = 255;
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if( og < 0 ) og = 0;
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if( og > 255 ) og = 255;
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if( ob < 0 ) ob = 0;
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if( ob > 255 ) ob = 255;
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// Pack bits in RGBA format
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return (ora << 24) | (og << 16) | (ob << 8) | 0xFF;
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}
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