diff options
Diffstat (limited to 'source/blender/compositor/operations/COM_BrightnessOperation.cpp')
-rw-r--r-- | source/blender/compositor/operations/COM_BrightnessOperation.cpp | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_BrightnessOperation.cpp b/source/blender/compositor/operations/COM_BrightnessOperation.cpp new file mode 100644 index 00000000000..bb481f71cc1 --- /dev/null +++ b/source/blender/compositor/operations/COM_BrightnessOperation.cpp @@ -0,0 +1,78 @@ +/* + * Copyright 2011, Blender Foundation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Contributor: + * Jeroen Bakker + * Monique Dewanchand + */ + +#include "COM_BrightnessOperation.h" + +BrightnessOperation::BrightnessOperation(): NodeOperation() { + this->addInputSocket(COM_DT_COLOR); + this->addInputSocket(COM_DT_VALUE); + this->addInputSocket(COM_DT_VALUE); + this->addOutputSocket(COM_DT_COLOR); + this->inputProgram = NULL; +} +void BrightnessOperation::initExecution() { + this->inputProgram = this->getInputSocketReader(0); + this->inputBrightnessProgram = this->getInputSocketReader(1); + this->inputContrastProgram = this->getInputSocketReader(2); +} + +void BrightnessOperation::executePixel(float* color, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[]) { + float inputValue[4]; + float a, b; + float inputBrightness[4]; + float inputContrast[4]; + this->inputProgram->read(inputValue, x, y, sampler, inputBuffers); + this->inputBrightnessProgram->read(inputBrightness, x, y, sampler, inputBuffers); + this->inputContrastProgram->read(inputContrast, x, y, sampler, inputBuffers); + float brightness = inputBrightness[0]; + float contrast = inputContrast[0]; + brightness /= 100.0f; + float delta = contrast / 200.0f; + a = 1.0f - delta * 2.0f; + /* + * The algorithm is by Werner D. Streidt + * (http://visca.com/ffactory/archives/5-99/msg00021.html) + * Extracted of OpenCV demhist.c + */ + if( contrast > 0 ) + { + a = 1.0f / a; + b = a * (brightness - delta); + } + else + { + delta *= -1; + b = a * (brightness + delta); + } + + color[0] = a*inputValue[0]+b; + color[1] = a*inputValue[1]+b; + color[2] = a*inputValue[2]+b; + color[3] = inputValue[3]; +} + +void BrightnessOperation::deinitExecution() { + this->inputProgram = NULL; + this->inputBrightnessProgram = NULL; + this->inputContrastProgram = NULL; +} + |