e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
132 lines
4.1 KiB
C++
132 lines
4.1 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.h"
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namespace blender::compositor {
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void CalculateStandardDeviationOperation::execute_pixel(float output[4],
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int /*x*/,
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int /*y*/,
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void * /*data*/)
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{
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output[0] = standard_deviation_;
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}
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void *CalculateStandardDeviationOperation::initialize_tile_data(rcti *rect)
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{
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lock_mutex();
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if (!iscalculated_) {
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MemoryBuffer *tile = (MemoryBuffer *)image_reader_->initialize_tile_data(rect);
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CalculateMeanOperation::calculate_mean(tile);
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standard_deviation_ = 0.0f;
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float *buffer = tile->get_buffer();
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int size = tile->get_width() * tile->get_height();
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int pixels = 0;
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float sum = 0.0f;
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float mean = result_;
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for (int i = 0, offset = 0; i < size; i++, offset += 4) {
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if (buffer[offset + 3] > 0) {
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pixels++;
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switch (setting_) {
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case 1: /* rgb combined */
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{
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float value = IMB_colormanagement_get_luminance(&buffer[offset]);
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sum += (value - mean) * (value - mean);
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break;
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}
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case 2: /* red */
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{
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float value = buffer[offset];
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sum += (value - mean) * (value - mean);
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break;
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}
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case 3: /* green */
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{
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float value = buffer[offset + 1];
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sum += (value - mean) * (value - mean);
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break;
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}
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case 4: /* blue */
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{
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float value = buffer[offset + 2];
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sum += (value - mean) * (value - mean);
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break;
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}
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case 5: /* luminance */
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{
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float yuv[3];
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rgb_to_yuv(buffer[offset],
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buffer[offset + 1],
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buffer[offset + 2],
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&yuv[0],
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&yuv[1],
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&yuv[2],
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BLI_YUV_ITU_BT709);
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sum += (yuv[0] - mean) * (yuv[0] - mean);
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break;
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}
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}
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}
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}
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standard_deviation_ = sqrt(sum / float(pixels - 1));
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iscalculated_ = true;
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}
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unlock_mutex();
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return nullptr;
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}
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void CalculateStandardDeviationOperation::update_memory_buffer_started(MemoryBuffer * /*output*/,
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const rcti & /*area*/,
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Span<MemoryBuffer *> inputs)
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{
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if (!iscalculated_) {
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const MemoryBuffer *input = inputs[0];
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const float mean = CalculateMeanOperation::calc_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 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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standard_deviation_ = total.num_pixels <= 1 ? 0.0f :
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sqrt(total.sum / float(total.num_pixels - 1));
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iscalculated_ = true;
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}
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}
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void CalculateStandardDeviationOperation::update_memory_buffer_partial(
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MemoryBuffer *output, const rcti &area, Span<MemoryBuffer *> /*inputs*/)
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{
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output->fill(area, &standard_deviation_);
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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)
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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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