125 lines
3.9 KiB
C
125 lines
3.9 KiB
C
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/***************************************************************************
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* helper functions for demo modes *
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* *
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* Copyright (C) 2011 - 2012 by Olaf Rempel *
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* razzor AT kopf MINUS tisch DOT de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; version 2 of the License, *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <stdint.h>
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#include <string.h>
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#include "rgb16mpm.h"
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uint8_t sequence_chase(uint8_t old_value, uint8_t *dir, uint16_t mask)
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{
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uint8_t value = old_value;
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do {
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value = (*dir) ? value +1 : value -1;
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value &= 0x0F;
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if (value == 0x00 || value == 0x0F) {
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*dir = (value == 0x00);
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}
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} while (!((1<<value) & mask) || value == old_value);
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return value;
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}
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uint16_t color_ramp(uint16_t value, uint8_t *color)
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{
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uint8_t col1 = (value & 0xFF);
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uint8_t col2 = 0xFF - col1;
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switch (value >> 8) {
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default:
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value = 0x0000;
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/* no break */
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case 0: /* red: on, green: ramp up, blue: off */
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color[0] = 0xFF;
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color[1] = col1;
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color[2] = 0x00;
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break;
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case 1: /* red: ramp down, green: on, blue:off */
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color[0] = col2;
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color[1] = 0xFF;
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color[2] = 0x00;
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break;
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case 2: /* red: off, green: on, blue: ramp up */
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color[0] = 0x00;
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color[1] = 0xFF;
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color[2] = col1;
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break;
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case 3: /* red: off, green: ramp down: blue: on */
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color[0] = 0x00;
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color[1] = col2;
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color[2] = 0xFF;
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break;
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case 4: /* red: ramp up, green: off, blue: on */
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color[0] = col1;
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color[1] = 0x00;
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color[2] = 0xFF;
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break;
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case 5: /* red: on, green: off, blue: ramp down */
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color[0] = 0xFF;
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color[1] = 0x00;
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color[2] = col2;
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break;
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}
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return value;
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}
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void color_add(uint8_t *color1, uint8_t *color2, uint8_t *output)
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{
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uint8_t i;
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for (i = 0; i < 3; i++) {
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uint16_t tmp = color1[i] + color2[i];
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output[i] = (tmp & 0xFF00) ? 0xFF : tmp;
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}
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}
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void color_sub(uint8_t *color1, uint8_t *color2, uint8_t *output)
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{
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uint8_t i;
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for (i = 0; i < 3; i++) {
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uint16_t tmp = color1[i] - color2[i];
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output[i] = (tmp & 0xFF00) ? 0x00 : tmp;
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}
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}
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void color_div(uint8_t *color, uint8_t div, uint8_t *output)
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{
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uint8_t i;
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for (i = 0; i < 3; i++) {
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if (color[i] != 0) {
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output[i] = color[i] / div;
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if (output[i] == 0) {
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output[i] = 0x01;
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}
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} else {
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output[i] = 0x00;
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}
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}
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}
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