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#include "brightness_contrast.h"
#include <cmath>
namespace image
{
void brightness_contrast(Image &image, float brightness, float contrast)
{
int channelCount = image.channels();
const float scale = image.maxval() - 1;
float brightness_v = brightness / 2.0f;
float slant = tanf((contrast + 1.0f) * 0.78539816339744830961566084581987572104929234984378f);
if (channelCount == 4)
channelCount = 3;
for (size_t i = 0; i < image.height() * image.width() * channelCount; i++)
{
float v = float(image.get(i)) / scale;
if (brightness_v < 0.0)
v = v * (1.0 + brightness_v);
else
v = v + ((1.0 - v) * brightness_v);
v = (v - 0.5) * slant + 0.5;
image.set(i, std::min<float>(scale, std::max<float>(0, v * scale)));
}
}
}
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