Philipp Oeser
b54528fa1e
followup to rB8dd95abb2ff9 (which fixed this for the Compositor node), turns out this was also wrong for the VSE modifier and in vertex color operator. - also adjust min/max for VSE modifier - also guard against division by zero Reviewers: brecht Maniphest Tasks: T67808 Differential Revision: https://developer.blender.org/D5398
92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright 2011, Blender Foundation.
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*/
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#include "COM_BrightnessOperation.h"
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BrightnessOperation::BrightnessOperation() : NodeOperation()
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{
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this->addInputSocket(COM_DT_COLOR);
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this->addInputSocket(COM_DT_VALUE);
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this->addInputSocket(COM_DT_VALUE);
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this->addOutputSocket(COM_DT_COLOR);
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this->m_inputProgram = NULL;
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this->m_use_premultiply = false;
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}
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void BrightnessOperation::setUsePremultiply(bool use_premultiply)
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{
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this->m_use_premultiply = use_premultiply;
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}
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void BrightnessOperation::initExecution()
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{
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this->m_inputProgram = this->getInputSocketReader(0);
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this->m_inputBrightnessProgram = this->getInputSocketReader(1);
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this->m_inputContrastProgram = this->getInputSocketReader(2);
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}
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void BrightnessOperation::executePixelSampled(float output[4],
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float x,
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float y,
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PixelSampler sampler)
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{
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float inputValue[4];
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float a, b;
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float inputBrightness[4];
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float inputContrast[4];
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this->m_inputProgram->readSampled(inputValue, x, y, sampler);
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this->m_inputBrightnessProgram->readSampled(inputBrightness, x, y, sampler);
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this->m_inputContrastProgram->readSampled(inputContrast, x, y, sampler);
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float brightness = inputBrightness[0];
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float contrast = inputContrast[0];
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brightness /= 100.0f;
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float delta = contrast / 200.0f;
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/*
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* The algorithm is by Werner D. Streidt
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* (http://visca.com/ffactory/archives/5-99/msg00021.html)
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* Extracted of OpenCV demhist.c
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*/
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if (contrast > 0) {
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a = 1.0f - delta * 2.0f;
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a = 1.0f / max_ff(a, FLT_EPSILON);
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b = a * (brightness - delta);
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}
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else {
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delta *= -1;
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a = max_ff(1.0f - delta * 2.0f, 0.0f);
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b = a * brightness + delta;
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}
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if (this->m_use_premultiply) {
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premul_to_straight_v4(inputValue);
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}
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output[0] = a * inputValue[0] + b;
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output[1] = a * inputValue[1] + b;
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output[2] = a * inputValue[2] + b;
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output[3] = inputValue[3];
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if (this->m_use_premultiply) {
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straight_to_premul_v4(output);
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}
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}
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void BrightnessOperation::deinitExecution()
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{
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this->m_inputProgram = NULL;
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this->m_inputBrightnessProgram = NULL;
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this->m_inputContrastProgram = NULL;
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}
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