77 lines
2.1 KiB
C++
77 lines
2.1 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_LuminanceMatteOperation.h"
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#include "BLI_math.h"
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extern "C" {
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#include "IMB_colormanagement.h"
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}
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LuminanceMatteOperation::LuminanceMatteOperation() : NodeOperation()
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{
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addInputSocket(COM_DT_COLOR);
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addOutputSocket(COM_DT_VALUE);
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this->m_inputImageProgram = NULL;
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}
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void LuminanceMatteOperation::initExecution()
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{
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this->m_inputImageProgram = this->getInputSocketReader(0);
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}
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void LuminanceMatteOperation::deinitExecution()
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{
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this->m_inputImageProgram = NULL;
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}
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void LuminanceMatteOperation::executePixelSampled(float output[4], float x, float y, PixelSampler sampler)
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{
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float inColor[4];
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this->m_inputImageProgram->readSampled(inColor, x, y, sampler);
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const float high = this->m_settings->t1;
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const float low = this->m_settings->t2;
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const float luminance = IMB_colormanagement_get_luminance(inColor);
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float alpha;
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/* one line thread-friend algorithm:
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* output[0] = min(inputValue[3], min(1.0f, max(0.0f, ((luminance - low) / (high - low))));
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*/
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/* test range */
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if (luminance > high) {
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alpha = 1.0f;
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}
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else if (luminance < low) {
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alpha = 0.0f;
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}
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else { /*blend */
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alpha = (luminance - low) / (high - low);
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}
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/* store matte(alpha) value in [0] to go with
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* COM_SetAlphaOperation and the Value output
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*/
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/* don't make something that was more transparent less transparent */
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output[0] = min_ff(alpha, inColor[3]);
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}
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