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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.
*/
#include "BKE_attribute_math.hh"
namespace blender::attribute_math {
Color4fMixer::Color4fMixer(MutableSpan<Color4f> output_buffer, Color4f default_color)
: buffer_(output_buffer),
default_color_(default_color),
total_weights_(output_buffer.size(), 0.0f)
{
buffer_.fill(Color4f(0, 0, 0, 0));
}
void Color4fMixer::mix_in(const int64_t index, const Color4f &color, const float weight)
{
BLI_assert(weight >= 0.0f);
Color4f &output_color = buffer_[index];
output_color.r += color.r * weight;
output_color.g += color.g * weight;
output_color.b += color.b * weight;
output_color.a += color.a * weight;
total_weights_[index] += weight;
}
void Color4fMixer::finalize()
{
for (const int64_t i : buffer_.index_range()) {
const float weight = total_weights_[i];
Color4f &output_color = buffer_[i];
if (weight > 0.0f) {
const float weight_inv = 1.0f / weight;
output_color.r *= weight_inv;
output_color.g *= weight_inv;
output_color.b *= weight_inv;
output_color.a *= weight_inv;
}
else {
output_color = default_color_;
}
}
}
} // namespace blender::attribute_math
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