diff options
Diffstat (limited to 'source/blender/compositor/operations/COM_AlphaOverKeyOperation.cc')
-rw-r--r-- | source/blender/compositor/operations/COM_AlphaOverKeyOperation.cc | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_AlphaOverKeyOperation.cc b/source/blender/compositor/operations/COM_AlphaOverKeyOperation.cc new file mode 100644 index 00000000000..668d07c7c3d --- /dev/null +++ b/source/blender/compositor/operations/COM_AlphaOverKeyOperation.cc @@ -0,0 +1,54 @@ +/* + * 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 2011, Blender Foundation. + */ + +#include "COM_AlphaOverKeyOperation.h" + +AlphaOverKeyOperation::AlphaOverKeyOperation() +{ + /* pass */ +} + +void AlphaOverKeyOperation::executePixelSampled(float output[4], + float x, + float y, + PixelSampler sampler) +{ + float inputColor1[4]; + float inputOverColor[4]; + float value[4]; + + this->m_inputValueOperation->readSampled(value, x, y, sampler); + this->m_inputColor1Operation->readSampled(inputColor1, x, y, sampler); + this->m_inputColor2Operation->readSampled(inputOverColor, x, y, sampler); + + if (inputOverColor[3] <= 0.0f) { + copy_v4_v4(output, inputColor1); + } + else if (value[0] == 1.0f && inputOverColor[3] >= 1.0f) { + copy_v4_v4(output, inputOverColor); + } + else { + float premul = value[0] * inputOverColor[3]; + float mul = 1.0f - premul; + + output[0] = (mul * inputColor1[0]) + premul * inputOverColor[0]; + output[1] = (mul * inputColor1[1]) + premul * inputOverColor[1]; + output[2] = (mul * inputColor1[2]) + premul * inputOverColor[2]; + output[3] = (mul * inputColor1[3]) + value[0] * inputOverColor[3]; + } +} |