60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
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/*
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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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* Jeroen Bakker
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* Monique Dewanchand
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*/
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#include "COM_AlphaOverPremultiplyOperation.h"
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AlphaOverPremultiplyOperation::AlphaOverPremultiplyOperation(): MixBaseOperation() {
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}
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void AlphaOverPremultiplyOperation::executePixel(float* outputValue, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[]) {
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float inputColor1[4];
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float inputOverColor[4];
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float value[4];
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inputValueOperation->read(value, x, y, sampler, inputBuffers);
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inputColor1Operation->read(inputColor1, x, y, sampler, inputBuffers);
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inputColor2Operation->read(inputOverColor, x, y, sampler, inputBuffers);
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/* Zero alpha values should still permit an add of RGB data */
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if(inputOverColor[3]<0.0f) {
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outputValue[0] = inputColor1[0];
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outputValue[1] = inputColor1[1];
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outputValue[2] = inputColor1[2];
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outputValue[3] = inputColor1[3];
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}
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else if(value[0]==1.0f && inputOverColor[3]>=1.0f) {
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outputValue[0] = inputOverColor[0];
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outputValue[1] = inputOverColor[1];
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outputValue[2] = inputOverColor[2];
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outputValue[3] = inputOverColor[3];
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}
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else {
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float mul= 1.0f - value[0]*inputOverColor[3];
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outputValue[0]= (mul*inputColor1[0]) + value[0]*inputOverColor[0];
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outputValue[1]= (mul*inputColor1[1]) + value[0]*inputOverColor[1];
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outputValue[2]= (mul*inputColor1[2]) + value[0]*inputOverColor[2];
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outputValue[3]= (mul*inputColor1[3]) + value[0]*inputOverColor[3];
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}
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}
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