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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2011 Blender Foundation. */
#include "COM_AlphaOverPremultiplyOperation.h"
namespace blender::compositor {
AlphaOverPremultiplyOperation::AlphaOverPremultiplyOperation()
{
flags_.can_be_constant = true;
}
void AlphaOverPremultiplyOperation::execute_pixel_sampled(float output[4],
float x,
float y,
PixelSampler sampler)
{
float input_color1[4];
float input_over_color[4];
float value[4];
input_value_operation_->read_sampled(value, x, y, sampler);
input_color1_operation_->read_sampled(input_color1, x, y, sampler);
input_color2_operation_->read_sampled(input_over_color, x, y, sampler);
/* Zero alpha values should still permit an add of RGB data */
if (input_over_color[3] < 0.0f) {
copy_v4_v4(output, input_color1);
}
else if (value[0] == 1.0f && input_over_color[3] >= 1.0f) {
copy_v4_v4(output, input_over_color);
}
else {
float mul = 1.0f - value[0] * input_over_color[3];
output[0] = (mul * input_color1[0]) + value[0] * input_over_color[0];
output[1] = (mul * input_color1[1]) + value[0] * input_over_color[1];
output[2] = (mul * input_color1[2]) + value[0] * input_over_color[2];
output[3] = (mul * input_color1[3]) + value[0] * input_over_color[3];
}
}
void AlphaOverPremultiplyOperation::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;
/* Zero alpha values should still permit an add of RGB data. */
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 mul = 1.0f - value * over_color[3];
p.out[0] = (mul * color1[0]) + value * over_color[0];
p.out[1] = (mul * color1[1]) + value * over_color[1];
p.out[2] = (mul * color1[2]) + value * over_color[2];
p.out[3] = (mul * color1[3]) + value * over_color[3];
}
}
}
} // namespace blender::compositor
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