7a395e2e7f
The last good commit wasf57e4c5b98. After this one more fix was committed, this one is preserved as well:67bd678887.
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/* SPDX-FileCopyrightText: 2011 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "COM_CalculateStandardDeviationOperation.h"
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#include "COM_ExecutionSystem.h"
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#include "IMB_colormanagement.hh"
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namespace blender::compositor {
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float CalculateStandardDeviationOperation::calculate_value(const MemoryBuffer *input) const
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{
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const float mean = this->calculate_mean(input);
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PixelsSum total = {0};
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exec_system_->execute_work<PixelsSum>(
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input->get_rect(),
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[=](const rcti &split) { return this->calc_area_sum(input, split, mean); },
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total,
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[](PixelsSum &join, const PixelsSum &chunk) {
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join.sum += chunk.sum;
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join.num_pixels += chunk.num_pixels;
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});
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return total.num_pixels <= 1 ? 0.0f : sqrt(total.sum / float(total.num_pixels - 1));
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}
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using PixelsSum = CalculateMeanOperation::PixelsSum;
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PixelsSum CalculateStandardDeviationOperation::calc_area_sum(const MemoryBuffer *input,
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const rcti &area,
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const float mean) const
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{
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PixelsSum result = {0};
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for (const float *elem : input->get_buffer_area(area)) {
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if (elem[3] <= 0.0f) {
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continue;
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}
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const float value = setting_func_(elem);
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result.sum += (value - mean) * (value - mean);
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result.num_pixels++;
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}
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return result;
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}
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} // namespace blender::compositor
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