AWB.cpp

#include "MyISP.h"
#include <math.h>

// RAW data processing
// auto white balance
void AWB(ImageRaw& raw, float r_gain, float gr_gain, float gb_gain, float b_gain, BAYER_PATTERN bayer_pattern, uint16_t clip)
{
	for (int y = 0; y < raw.getHeight(); y+= 2)
	{
		for (int x = 0; x < raw.getWidth(); x+= 2)
		{
			switch (bayer_pattern)
			{
			case BAYER_PATTERN_RGGB:
				raw.at(y, x) *= r_gain;
				raw.at(y, x + 1) *= gr_gain;
				raw.at(y + 1, x) *= gb_gain;
				raw.at(y + 1, x + 1) *= b_gain;
				break;
			case BAYER_PATTERN_BGGR:
				raw.at(y, x) *= b_gain;
				raw.at(y, x + 1) *= gb_gain;
				raw.at(y + 1, x) *= gr_gain;
				raw.at(y + 1, x + 1) *= r_gain;
				break;
			case BAYER_PATTERN_GBRG:
				raw.at(y, x) *= gb_gain;
				raw.at(y, x + 1) *= b_gain;
				raw.at(y + 1, x) *= r_gain;
				raw.at(y + 1, x + 1) *= gr_gain;
				break;
			case BAYER_PATTERN_GRBG:
				raw.at(y, x) *= gr_gain;
				raw.at(y, x + 1) *= r_gain;
				raw.at(y + 1, x) *= b_gain;
				raw.at(y + 1, x + 1) *= gb_gain;
				break;
			case BAYER_PATTERN_UNKNOWN:
				break;
			default:
				break;
			}
		}
	}
	raw.clip(0, clip);
}