Lukas Tönne
c566e408e4
Distinguish the 3 different methods for acquiring pixel color values (executePixel, executePixelSampled, executePixelFiltered). This makes it easier to keep track of the different sampling methods (and works nicer with IDEs that do code parsing). Differential Revision: http://developer.blender.org/D7
127 lines
3.0 KiB
C++
127 lines
3.0 KiB
C++
/*
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* Copyright 2012, 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_ChannelMatteOperation.h"
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#include "BLI_math.h"
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ChannelMatteOperation::ChannelMatteOperation() : 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 ChannelMatteOperation::initExecution()
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{
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this->m_inputImageProgram = this->getInputSocketReader(0);
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this->m_limit_range = this->m_limit_max - this->m_limit_min;
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switch (this->m_limit_method) {
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/* SINGLE */
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case 0:
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{
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/* 123 / RGB / HSV / YUV / YCC */
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const int matte_channel = this->m_matte_channel - 1;
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const int limit_channel = this->m_limit_channel - 1;
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this->m_ids[0] = matte_channel;
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this->m_ids[1] = limit_channel;
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this->m_ids[2] = limit_channel;
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break;
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}
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/* MAX */
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case 1:
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{
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switch (this->m_matte_channel) {
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case 1:
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{
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this->m_ids[0] = 0;
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this->m_ids[1] = 1;
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this->m_ids[2] = 2;
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break;
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}
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case 2:
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{
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this->m_ids[0] = 1;
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this->m_ids[1] = 0;
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this->m_ids[2] = 2;
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break;
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}
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case 3:
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{
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this->m_ids[0] = 2;
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this->m_ids[1] = 0;
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this->m_ids[2] = 1;
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break;
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}
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default:
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break;
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}
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break;
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}
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default:
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break;
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}
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}
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void ChannelMatteOperation::deinitExecution()
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{
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this->m_inputImageProgram = NULL;
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}
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void ChannelMatteOperation::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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float alpha;
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const float limit_max = this->m_limit_max;
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const float limit_min = this->m_limit_min;
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const float limit_range = this->m_limit_range;
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this->m_inputImageProgram->readSampled(inColor, x, y, sampler);
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/* matte operation */
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alpha = inColor[this->m_ids[0]] - max(inColor[this->m_ids[1]], inColor[this->m_ids[2]]);
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/* flip because 0.0 is transparent, not 1.0 */
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alpha = 1.0f - alpha;
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/* test range */
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if (alpha > limit_max) {
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alpha = inColor[3]; /*whatever it was prior */
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}
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else if (alpha < limit_min) {
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alpha = 0.f;
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}
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else { /*blend */
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alpha = (alpha - limit_min) / limit_range;
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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(alpha, inColor[3]);
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}
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