diff options
Diffstat (limited to 'source/blender/compositor/operations/COM_ChannelMatteOperation.cc')
-rw-r--r-- | source/blender/compositor/operations/COM_ChannelMatteOperation.cc | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_ChannelMatteOperation.cc b/source/blender/compositor/operations/COM_ChannelMatteOperation.cc new file mode 100644 index 00000000000..15375589888 --- /dev/null +++ b/source/blender/compositor/operations/COM_ChannelMatteOperation.cc @@ -0,0 +1,120 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright 2012, Blender Foundation. + */ + +#include "COM_ChannelMatteOperation.h" +#include "BLI_math.h" + +ChannelMatteOperation::ChannelMatteOperation() +{ + addInputSocket(COM_DT_COLOR); + addOutputSocket(COM_DT_VALUE); + + this->m_inputImageProgram = nullptr; +} + +void ChannelMatteOperation::initExecution() +{ + this->m_inputImageProgram = this->getInputSocketReader(0); + + this->m_limit_range = this->m_limit_max - this->m_limit_min; + + switch (this->m_limit_method) { + /* SINGLE */ + case 0: { + /* 123 / RGB / HSV / YUV / YCC */ + const int matte_channel = this->m_matte_channel - 1; + const int limit_channel = this->m_limit_channel - 1; + this->m_ids[0] = matte_channel; + this->m_ids[1] = limit_channel; + this->m_ids[2] = limit_channel; + break; + } + /* MAX */ + case 1: { + switch (this->m_matte_channel) { + case 1: { + this->m_ids[0] = 0; + this->m_ids[1] = 1; + this->m_ids[2] = 2; + break; + } + case 2: { + this->m_ids[0] = 1; + this->m_ids[1] = 0; + this->m_ids[2] = 2; + break; + } + case 3: { + this->m_ids[0] = 2; + this->m_ids[1] = 0; + this->m_ids[2] = 1; + break; + } + default: + break; + } + break; + } + default: + break; + } +} + +void ChannelMatteOperation::deinitExecution() +{ + this->m_inputImageProgram = nullptr; +} + +void ChannelMatteOperation::executePixelSampled(float output[4], + float x, + float y, + PixelSampler sampler) +{ + float inColor[4]; + float alpha; + + const float limit_max = this->m_limit_max; + const float limit_min = this->m_limit_min; + const float limit_range = this->m_limit_range; + + this->m_inputImageProgram->readSampled(inColor, x, y, sampler); + + /* matte operation */ + alpha = inColor[this->m_ids[0]] - MAX2(inColor[this->m_ids[1]], inColor[this->m_ids[2]]); + + /* flip because 0.0 is transparent, not 1.0 */ + alpha = 1.0f - alpha; + + /* test range */ + if (alpha > limit_max) { + alpha = inColor[3]; /*whatever it was prior */ + } + else if (alpha < limit_min) { + alpha = 0.0f; + } + else { /*blend */ + alpha = (alpha - limit_min) / limit_range; + } + + /* Store matte(alpha) value in [0] to go with + * COM_SetAlphaMultiplyOperation and the Value output. + */ + + /* Don't make something that was more transparent less transparent. */ + output[0] = MIN2(alpha, inColor[3]); +} |