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Differential D5378 Diff 16729 source/blender/compositor/operations/COM_BrightnessOperation.cpp

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source/blender/compositor/operations/COM_BrightnessOperation.cpp

Show First 20 Lines • Show All 50 Lines • ▼ Show 20 Linesvoid BrightnessOperation::executePixelSampled(float output[4],
float inputContrast[4]; float inputContrast[4];
this->m_inputProgram->readSampled(inputValue, x, y, sampler); this->m_inputProgram->readSampled(inputValue, x, y, sampler);
this->m_inputBrightnessProgram->readSampled(inputBrightness, x, y, sampler); this->m_inputBrightnessProgram->readSampled(inputBrightness, x, y, sampler);
this->m_inputContrastProgram->readSampled(inputContrast, x, y, sampler); this->m_inputContrastProgram->readSampled(inputContrast, x, y, sampler);
float brightness = inputBrightness[0]; float brightness = inputBrightness[0];
float contrast = inputContrast[0]; float contrast = inputContrast[0];
brightness /= 100.0f; brightness /= 100.0f;
float delta = contrast / 200.0f; float delta = contrast / 200.0f;
a = 1.0f - delta * 2.0f;
/* /*
* 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 / a; a = 1.0f / (1.0f - delta * 2.0f);
b = a * (brightness - delta); b = a * (brightness - delta);
} }
else { else {
delta *= -1; delta *= -1;
b = a * (brightness + delta); a = 1.0f - delta * 2.0f;
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;
output[3] = inputValue[3]; output[3] = inputValue[3];
Show All 11 Lines