84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright 2011, Blender Foundation.
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*/
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#include "COM_AlphaOverKeyOperation.h"
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namespace blender::compositor {
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AlphaOverKeyOperation::AlphaOverKeyOperation()
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{
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flags_.can_be_constant = true;
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}
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void AlphaOverKeyOperation::execute_pixel_sampled(float output[4],
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float x,
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float y,
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PixelSampler sampler)
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{
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float input_color1[4];
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float input_over_color[4];
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float value[4];
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input_value_operation_->read_sampled(value, x, y, sampler);
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input_color1_operation_->read_sampled(input_color1, x, y, sampler);
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input_color2_operation_->read_sampled(input_over_color, x, y, sampler);
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if (input_over_color[3] <= 0.0f) {
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copy_v4_v4(output, input_color1);
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}
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else if (value[0] == 1.0f && input_over_color[3] >= 1.0f) {
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copy_v4_v4(output, input_over_color);
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}
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else {
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float premul = value[0] * input_over_color[3];
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float mul = 1.0f - premul;
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output[0] = (mul * input_color1[0]) + premul * input_over_color[0];
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output[1] = (mul * input_color1[1]) + premul * input_over_color[1];
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output[2] = (mul * input_color1[2]) + premul * input_over_color[2];
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output[3] = (mul * input_color1[3]) + value[0] * input_over_color[3];
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}
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}
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void AlphaOverKeyOperation::update_memory_buffer_row(PixelCursor &p)
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{
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for (; p.out < p.row_end; p.next()) {
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const float *color1 = p.color1;
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const float *over_color = p.color2;
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const float value = *p.value;
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if (over_color[3] <= 0.0f) {
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copy_v4_v4(p.out, color1);
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}
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else if (value == 1.0f && over_color[3] >= 1.0f) {
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copy_v4_v4(p.out, over_color);
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}
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else {
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const float premul = value * over_color[3];
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const float mul = 1.0f - premul;
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p.out[0] = (mul * color1[0]) + premul * over_color[0];
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p.out[1] = (mul * color1[1]) + premul * over_color[1];
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p.out[2] = (mul * color1[2]) + premul * over_color[2];
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p.out[3] = (mul * color1[3]) + value * over_color[3];
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}
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}
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}
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} // namespace blender::compositor
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