7a395e2e7f
The last good commit wasf57e4c5b98. After this one more fix was committed, this one is preserved as well:67bd678887.
71 lines
1.9 KiB
C++
71 lines
1.9 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_BrightnessOperation.h"
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#include "BLI_math_color.h"
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namespace blender::compositor {
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BrightnessOperation::BrightnessOperation()
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{
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this->add_input_socket(DataType::Color);
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this->add_input_socket(DataType::Value);
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this->add_input_socket(DataType::Value);
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this->add_output_socket(DataType::Color);
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use_premultiply_ = false;
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flags_.can_be_constant = true;
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}
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void BrightnessOperation::set_use_premultiply(bool use_premultiply)
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{
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use_premultiply_ = use_premultiply;
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}
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void BrightnessOperation::update_memory_buffer_partial(MemoryBuffer *output,
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const rcti &area,
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Span<MemoryBuffer *> inputs)
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{
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float tmp_color[4];
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for (BuffersIterator<float> it = output->iterate_with(inputs, area); !it.is_end(); ++it) {
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const float *in_color = it.in(0);
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const float brightness = *it.in(1) / 100.0f;
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const float contrast = *it.in(2);
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float delta = contrast / 200.0f;
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/*
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* The algorithm is by Werner D. Streidt
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* (http://visca.com/ffactory/archives/5-99/msg00021.html)
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* Extracted of OpenCV `demhist.c`.
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*/
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float a, b;
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if (contrast > 0) {
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a = 1.0f - delta * 2.0f;
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a = 1.0f / max_ff(a, FLT_EPSILON);
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b = a * (brightness - delta);
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}
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else {
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delta *= -1;
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a = max_ff(1.0f - delta * 2.0f, 0.0f);
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b = a * brightness + delta;
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}
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const float *color;
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if (use_premultiply_) {
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premul_to_straight_v4_v4(tmp_color, in_color);
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color = tmp_color;
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}
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else {
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color = in_color;
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}
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it.out[0] = a * color[0] + b;
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it.out[1] = a * color[1] + b;
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it.out[2] = a * color[2] + b;
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it.out[3] = color[3];
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if (use_premultiply_) {
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straight_to_premul_v4(it.out);
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}
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}
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}
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} // namespace blender::compositor
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