102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
/*
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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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* Dalai Felinto
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*/
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#include "COM_ChromaMatteOperation.h"
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#include "BLI_math.h"
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ChromaMatteOperation::ChromaMatteOperation() : NodeOperation()
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{
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addInputSocket(COM_DT_COLOR);
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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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this->m_inputKeyProgram = NULL;
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}
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void ChromaMatteOperation::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 ChromaMatteOperation::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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void ChromaMatteOperation::executePixel(float *outputValue, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[])
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{
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float inKey[4];
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float inImage[4];
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const float acceptance = this->m_settings->t1; /* in radians */
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const float cutoff = this->m_settings->t2; /* in radians */
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const float gain = this->m_settings->fstrength;
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float x_angle, z_angle, alpha;
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float theta, beta;
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float kfg;
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this->m_inputKeyProgram->read(inKey, x, y, sampler, inputBuffers);
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this->m_inputImageProgram->read(inImage, x, y, sampler, inputBuffers);
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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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/* Algorithm from book "Video Demistified," does not include the spill reduction part */
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/* find theta, the angle that the color space should be rotated based on key*/
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theta = atan2(inKey[2], inKey[1]);
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/*rotate the cb and cr into x/z space */
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x_angle = inImage[1] * cosf(theta) + inImage[2] * sinf(theta);
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z_angle = inImage[2] * cosf(theta) - inImage[1] * sinf(theta);
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/*if within the acceptance angle */
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/* if kfg is <0 then the pixel is outside of the key color */
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kfg = x_angle - (fabsf(z_angle) / tanf(acceptance / 2.f));
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if (kfg > 0.f) { /* found a pixel that is within key color */
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alpha = (1.f - kfg) * (gain);
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beta = atan2(z_angle, x_angle);
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/* if beta is within the cutoff angle */
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if (fabsf(beta) < (cutoff / 2.f)) {
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alpha = 0.f;
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}
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/* don't make something that was more transparent less transparent */
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if (alpha < inImage[3]) {
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outputValue[0] = alpha;
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}
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else {
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outputValue[0] = inImage[3];
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}
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}
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else { /*pixel is outside key color */
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outputValue[0] = inImage[3]; /* make pixel just as transparent as it was before */
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}
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}
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