diff options
Diffstat (limited to 'source/blender/compositor/operations/COM_LuminanceMatteOperation.cc')
-rw-r--r-- | source/blender/compositor/operations/COM_LuminanceMatteOperation.cc | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_LuminanceMatteOperation.cc b/source/blender/compositor/operations/COM_LuminanceMatteOperation.cc new file mode 100644 index 00000000000..2bd7493625e --- /dev/null +++ b/source/blender/compositor/operations/COM_LuminanceMatteOperation.cc @@ -0,0 +1,77 @@ +/* + * 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. + * + * Copyright 2011, Blender Foundation. + */ + +#include "COM_LuminanceMatteOperation.h" +#include "BLI_math.h" + +#include "IMB_colormanagement.h" + +LuminanceMatteOperation::LuminanceMatteOperation() +{ + addInputSocket(COM_DT_COLOR); + addOutputSocket(COM_DT_VALUE); + + this->m_inputImageProgram = nullptr; +} + +void LuminanceMatteOperation::initExecution() +{ + this->m_inputImageProgram = this->getInputSocketReader(0); +} + +void LuminanceMatteOperation::deinitExecution() +{ + this->m_inputImageProgram = nullptr; +} + +void LuminanceMatteOperation::executePixelSampled(float output[4], + float x, + float y, + PixelSampler sampler) +{ + float inColor[4]; + this->m_inputImageProgram->readSampled(inColor, x, y, sampler); + + const float high = this->m_settings->t1; + const float low = this->m_settings->t2; + const float luminance = IMB_colormanagement_get_luminance(inColor); + + float alpha; + + /* one line thread-friend algorithm: + * output[0] = MIN2(inputValue[3], MIN2(1.0f, MAX2(0.0f, ((luminance - low) / (high - low)))); + */ + + /* test range */ + if (luminance > high) { + alpha = 1.0f; + } + else if (luminance < low) { + alpha = 0.0f; + } + else { /*blend */ + alpha = (luminance - low) / (high - low); + } + + /* Store matte(alpha) value in [0] to go with + * COM_SetAlphaMultiplyOperation and the Value output. + */ + + /* don't make something that was more transparent less transparent */ + output[0] = min_ff(alpha, inColor[3]); +} |