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22 lines
554 B
C
22 lines
554 B
C
/* Very simple grayscale filter.
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* Author: Hans-Kristian Arntzen
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* License: Public domain
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*/
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#include "grayscale.h"
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// Input format 0RRRRRGGGGGBBBBB. Colors themselves could be switched around.
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void grayscale_filter(uint16_t *data, int width, int height)
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{
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for (int i = 0; i < width * height; i++ )
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{
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int r, g, b, color;
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r = (data[i] >> 10) & 0x1F;
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g = (data[i] >> 5) & 0x1F;
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b = (data[i] >> 0) & 0x1F;
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color = (int)(r * 0.3 + g * 0.59 + b * 0.11);
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data[i] = (color << 10) | (color << 5) | color;
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}
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}
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