com.diozero.util.ColourUtil Maven / Gradle / Ivy
package com.diozero.util;
/*-
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: ColourUtil.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
public class ColourUtil {
/*
* Each pixel has 16-bit data.
* Three sub-pixels for colour A, B and C have 5 bits, 6 bits and 5 bits respectively.
*/
public static short createColour565(byte red, byte green, byte blue) {
// 65k format 1 in normal order (ABC = RGB)
// (2 bytes): MSB C4C3C2C1C0B5B4B3, LSB B2B1B0A4A3A2A1A0
// MSB B4B3B2B1B0G5G4G3, LSB G2G1G0R4R3R2R1R0
int colour = blue & 0b11111;
colour |= (green & 0b111111) << 5;
colour |= (red & 0b11111) << 11;
/*
* buf[i] = r & 0xF8 | g >> 5
* buf[i + 1] = g << 5 & 0xE0 | b >> 3
*/
return (short) colour;
}
}