113 lines
4.6 KiB
C++
113 lines
4.6 KiB
C++
////////////////////////////////////////////////////////////
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//
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// Copyright (c) <2019> Simon Gauvin (gauvinsimon@gmail.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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////////////////////////////////////////////////////////////
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#include "HsvConverter.h"
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namespace HsvConverter
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{
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namespace
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{
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uint8_t getColorValueFromSaturation(uint8_t color, uint8_t saturation)
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{
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uint8_t colorAddition = static_cast<uint16_t>((255 - saturation)) * (255 - color) / 255;
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return color + colorAddition;
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}
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} // namespace
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void getRgbFromHSV(uint16_t hue, uint8_t saturation, uint8_t value,
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uint8_t& red, uint8_t& green, uint8_t& blue)
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{
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static constexpr uint16_t maxHue = 6 * 255;
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hue %= maxHue;
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// This variable is to know on which part of the rgb graph we are
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// 0 = [0, 59], 1 = [60, 119] ... 5 = [0, 359]
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// https://en.wikipedia.org/wiki/HSL_and_HSV#/media/File:HSV-RGB-comparison.svg
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uint8_t graphSection = hue / 255;
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const uint8_t valueInGraphPortion = hue % 255; // Aka hue % 60
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uint32_t r, g, b;
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switch (graphSection)
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{
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case 0: // 0 to 59 degrees
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red = value;
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green = getColorValueFromSaturation(valueInGraphPortion, saturation) * static_cast<uint16_t>(value) / 255;
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blue = (255 - saturation) * static_cast<uint16_t>(value) / 255;
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break;
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case 1: // 60 to 119 degrees
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red = getColorValueFromSaturation(255 - valueInGraphPortion, saturation) * static_cast<uint16_t>(value) / 255;
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green = value;
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blue = (255 - saturation) * static_cast<uint16_t>(value) / 255;
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break;
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case 2: // 120 to 179 degrees
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red = (255 - saturation) * static_cast<uint16_t>(value) / 255;
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green = value;
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blue = getColorValueFromSaturation(valueInGraphPortion, saturation) * static_cast<uint16_t>(value) / 255;
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break;
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case 3: // 180 to 239 degrees
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red = (255 - saturation) * static_cast<uint16_t>(value) / 255;
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green = getColorValueFromSaturation(255 - valueInGraphPortion, saturation) * static_cast<uint16_t>(value) / 255;
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blue = value;
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break;
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case 4:// 240 to 299 degrees
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red = getColorValueFromSaturation(valueInGraphPortion, saturation) * static_cast<uint16_t>(value) / 255;
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green = (255 - saturation) * static_cast<uint16_t>(value) / 255;
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blue = value;
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break;
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case 5: // 300 to 360 degrees
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red = value;
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green = (255 - saturation) * static_cast<uint16_t>(value) / 255;
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blue = getColorValueFromSaturation(255 - valueInGraphPortion, saturation) * static_cast<uint16_t>(value) / 255;
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break;
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}
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}
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uint32_t getColorFromHSV(uint16_t hue, uint8_t saturation, uint8_t value)
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{
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uint8_t r, g, b;
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getRgbFromHSV(hue, saturation, value, r, g, b);
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return getColorFromRgb(r, g, b);
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}
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uint32_t getColorFromRgb(uint8_t red, uint8_t green, uint8_t blue)
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{
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return (static_cast<uint32_t>(red) << 16) | (static_cast<uint16_t>(green) << 8) | blue;
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}
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uint8_t getRedValueFromColor(const uint32_t& color)
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{
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return (color & 0xFF0000) >> 16;
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}
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uint8_t getGreenValueFromColor(const uint32_t& color)
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{
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return (color & 0xFF00) >> 8;
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}
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uint8_t getBlueValueFromColor(const uint32_t& color)
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{
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return color & 0xFF;
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}
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} // namespace HsvConverter
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