90 lines
2.5 KiB
C++
90 lines
2.5 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_DistanceRGBMatteOperation.h"
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#include "BLI_math.h"
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DistanceRGBMatteOperation::DistanceRGBMatteOperation() : NodeOperation()
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{
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this->addInputSocket(COM_DT_COLOR);
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this->addInputSocket(COM_DT_COLOR);
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this->addOutputSocket(COM_DT_VALUE);
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this->m_inputImageProgram = NULL;
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this->m_inputKeyProgram = NULL;
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}
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void DistanceRGBMatteOperation::initExecution()
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{
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this->m_inputImageProgram = this->getInputSocketReader(0);
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this->m_inputKeyProgram = this->getInputSocketReader(1);
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}
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void DistanceRGBMatteOperation::deinitExecution()
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{
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this->m_inputImageProgram = NULL;
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this->m_inputKeyProgram = NULL;
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}
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float DistanceRGBMatteOperation::calculateDistance(float key[4], float image[4])
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{
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return len_v3v3(key, image);
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}
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void DistanceRGBMatteOperation::executePixelSampled(float output[4], float x, float y, PixelSampler sampler)
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{
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float inKey[4];
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float inImage[4];
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const float tolerance = this->m_settings->t1;
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const float falloff = this->m_settings->t2;
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float distance;
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float alpha;
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this->m_inputKeyProgram->readSampled(inKey, x, y, sampler);
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this->m_inputImageProgram->readSampled(inImage, x, y, sampler);
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distance = this->calculateDistance(inKey, inImage);
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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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/*make 100% transparent */
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if (distance < tolerance) {
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output[0] = 0.0f;
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}
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/*in the falloff region, make partially transparent */
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else if (distance < falloff + tolerance) {
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distance = distance - tolerance;
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alpha = distance / falloff;
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/*only change if more transparent than before */
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if (alpha < inImage[3]) {
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output[0] = alpha;
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}
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else { /* leave as before */
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output[0] = inImage[3];
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}
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}
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else {
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/* leave as before */
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output[0] = inImage[3];
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}
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}
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