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Viewing changes to source/blender/compositor/operations/COM_BrightnessOperation.cpp

  • Committer: Package Import Robot
  • Author(s): Jeremy Bicha
  • Date: 2013-03-06 12:08:47 UTC
  • mfrom: (1.5.1) (14.1.8 experimental)
  • Revision ID: package-import@ubuntu.com-20130306120847-frjfaryb2zrotwcg
Tags: 2.66a-1ubuntu1
https://launchpad.net/bugs/1076930
https://launchpad.net/bugs/1089256
https://launchpad.net/bugs/1052743
https://launchpad.net/bugs/999024
* Resynchronize with Debian (LP: #1076930, #1089256, #1052743, #999024,
  #1122888, #1147084)
* debian/control:
  - Lower build-depends on libavcodec-dev since we're not
    doing the libav9 transition in Ubuntu yet

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source/blender/compositor/operations/COM_BrightnessOperation.cpp
 
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/*
 
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 * Copyright 2011, Blender Foundation.
 
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 *
 
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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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 * Contributor: 
 
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 *              Jeroen Bakker 
 
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 *              Monique Dewanchand
 
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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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}
 
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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::executePixel(float output[4], float x, float y, 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->read(inputValue, x, y, sampler);
 
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        this->m_inputBrightnessProgram->read(inputBrightness, x, y, sampler);
 
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        this->m_inputContrastProgram->read(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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        a = 1.0f - delta * 2.0f;
 
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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 / a;
 
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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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                b = a * (brightness + delta);
 
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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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}
 
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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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