Differential D5398 Diff 16792 source/blender/compositor/operations/COM_BrightnessOperation.cpp

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Show First 20 Lines • Show All 56 Lines • ▼ Show 20 Lines	void BrightnessOperation::executePixelSampled(float output[4],
brightness /= 100.0f;		brightness /= 100.0f;
float delta = contrast / 200.0f;		float delta = contrast / 200.0f;
/*		/*
* The algorithm is by Werner D. Streidt		* The algorithm is by Werner D. Streidt
* (http://visca.com/ffactory/archives/5-99/msg00021.html)		* (http://visca.com/ffactory/archives/5-99/msg00021.html)
* Extracted of OpenCV demhist.c		* Extracted of OpenCV demhist.c
*/		*/
if (contrast > 0) {		if (contrast > 0) {
a = 1.0f / (1.0f - delta * 2.0f);		a = 1.0f - delta * 2.0f;
		a = 1.0f / max_ff(a, FLT_EPSILON);
b = a * (brightness - delta);		b = a * (brightness - delta);
}		}
else {		else {
delta *= -1;		delta *= -1;
a = 1.0f - delta * 2.0f;		a = max_ff(1.0f - delta * 2.0f, 0.0f);
b = a * brightness + delta;		b = a * brightness + delta;
}		}
if (this->m_use_premultiply) {		if (this->m_use_premultiply) {
premul_to_straight_v4(inputValue);		premul_to_straight_v4(inputValue);
}		}
output[0] = a * inputValue[0] + b;		output[0] = a * inputValue[0] + b;
output[1] = a * inputValue[1] + b;		output[1] = a * inputValue[1] + b;
output[2] = a * inputValue[2] + b;		output[2] = a * inputValue[2] + b;
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