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/*
* 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_AlphaOverMixedOperation.h"
namespace blender::compositor {
AlphaOverMixedOperation::AlphaOverMixedOperation()
{
this->m_x = 0.0f;
this->flags.can_be_constant = true;
}
void AlphaOverMixedOperation::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 addfac = 1.0f - this->m_x + inputOverColor[3] * this->m_x;
float premul = value[0] * addfac;
float mul = 1.0f - value[0] * inputOverColor[3];
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];
}
}
void AlphaOverMixedOperation::update_memory_buffer_row(PixelCursor &p)
{
for (; p.out < p.row_end; p.next()) {
const float *color1 = p.color1;
const float *over_color = p.color2;
const float value = *p.value;
if (over_color[3] <= 0.0f) {
copy_v4_v4(p.out, color1);
}
else if (value == 1.0f && over_color[3] >= 1.0f) {
copy_v4_v4(p.out, over_color);
}
else {
const float addfac = 1.0f - this->m_x + over_color[3] * this->m_x;
const float premul = value * addfac;
const float mul = 1.0f - value * over_color[3];
p.out[0] = (mul * color1[0]) + premul * over_color[0];
p.out[1] = (mul * color1[1]) + premul * over_color[1];
p.out[2] = (mul * color1[2]) + premul * over_color[2];
p.out[3] = (mul * color1[3]) + value * over_color[3];
}
}
}
} // namespace blender::compositor
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