forked from Makuna/NeoPixelBus
59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
/*-------------------------------------------------------------------------
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This file contains the HtmlColor implementation
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Written by Unai Uribarri
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I invest time and resources providing this open source code,
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please support me by dontating (see https://github.com/Makuna/NeoPixelBus)
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-------------------------------------------------------------------------
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This file is part of the Makuna/NeoPixelBus library.
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NeoPixelBus is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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NeoPixelBus 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with NeoPixel. If not, see
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<http://www.gnu.org/licenses/>.
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-------------------------------------------------------------------------*/
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#include "HtmlColor.h"
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static inline char hexdigit(uint8_t v)
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{
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return v + (v < 10 ? '0' : 'a' - 10);
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}
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size_t HtmlColor::ToNumericalString(char* buf, size_t bufSize) const
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{
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size_t bufLen = bufSize - 1;
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if (bufLen-- > 0)
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{
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if (bufLen > 0)
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{
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buf[0] = '#';
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}
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uint32_t color = Color;
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for (uint8_t indexDigit = 6; indexDigit > 0; indexDigit--)
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{
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if (bufLen > indexDigit)
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{
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buf[indexDigit] = hexdigit(color & 0x0000000f);
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}
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color >>= 4;
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}
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buf[(bufLen < 7 ? bufLen : 7)] = 0;
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}
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return 7;
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}
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