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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2011 Blender Foundation. */
#include "COM_DisplaceOperation.h"
namespace blender::compositor {
DisplaceOperation::DisplaceOperation()
{
this->add_input_socket(DataType::Color);
this->add_input_socket(DataType::Vector);
this->add_input_socket(DataType::Value);
this->add_input_socket(DataType::Value);
this->add_output_socket(DataType::Color);
flags_.complex = true;
input_color_program_ = nullptr;
}
void DisplaceOperation::init_execution()
{
input_color_program_ = this->get_input_socket_reader(0);
NodeOperation *vector = this->get_input_socket_reader(1);
NodeOperation *scale_x = this->get_input_socket_reader(2);
NodeOperation *scale_y = this->get_input_socket_reader(3);
if (execution_model_ == eExecutionModel::Tiled) {
vector_read_fn_ = [=](float x, float y, float *out) {
vector->read_sampled(out, x, y, PixelSampler::Bilinear);
};
scale_x_read_fn_ = [=](float x, float y, float *out) {
scale_x->read_sampled(out, x, y, PixelSampler::Nearest);
};
scale_y_read_fn_ = [=](float x, float y, float *out) {
scale_y->read_sampled(out, x, y, PixelSampler::Nearest);
};
}
width_x4_ = this->get_width() * 4;
height_x4_ = this->get_height() * 4;
input_vector_width_ = vector->get_width();
input_vector_height_ = vector->get_height();
}
void DisplaceOperation::execute_pixel_sampled(float output[4],
float x,
float y,
PixelSampler /*sampler*/)
{
float xy[2] = {x, y};
float uv[2], deriv[2][2];
pixel_transform(xy, uv, deriv);
if (is_zero_v2(deriv[0]) && is_zero_v2(deriv[1])) {
input_color_program_->read_sampled(output, uv[0], uv[1], PixelSampler::Bilinear);
}
else {
/* EWA filtering (without nearest it gets blurry with NO distortion) */
input_color_program_->read_filtered(output, uv[0], uv[1], deriv[0], deriv[1]);
}
}
bool DisplaceOperation::read_displacement(
float x, float y, float xscale, float yscale, const float origin[2], float &r_u, float &r_v)
{
float width = input_vector_width_;
float height = input_vector_height_;
if (x < 0.0f || x >= width || y < 0.0f || y >= height) {
r_u = 0.0f;
r_v = 0.0f;
return false;
}
float col[4];
vector_read_fn_(x, y, col);
r_u = origin[0] - col[0] * xscale;
r_v = origin[1] - col[1] * yscale;
return true;
}
void DisplaceOperation::pixel_transform(const float xy[2], float r_uv[2], float r_deriv[2][2])
{
float col[4];
float uv[2]; /* temporary variables for derivative estimation */
int num;
scale_x_read_fn_(xy[0], xy[1], col);
float xs = col[0];
scale_y_read_fn_(xy[0], xy[1], col);
float ys = col[0];
/* clamp x and y displacement to triple image resolution -
* to prevent hangs from huge values mistakenly plugged in eg. z buffers */
CLAMP(xs, -width_x4_, width_x4_);
CLAMP(ys, -height_x4_, height_x4_);
/* displaced pixel in uv coords, for image sampling */
read_displacement(xy[0], xy[1], xs, ys, xy, r_uv[0], r_uv[1]);
/* Estimate partial derivatives using 1-pixel offsets */
const float epsilon[2] = {1.0f, 1.0f};
zero_v2(r_deriv[0]);
zero_v2(r_deriv[1]);
num = 0;
if (read_displacement(xy[0] + epsilon[0], xy[1], xs, ys, xy, uv[0], uv[1])) {
r_deriv[0][0] += uv[0] - r_uv[0];
r_deriv[1][0] += uv[1] - r_uv[1];
num++;
}
if (read_displacement(xy[0] - epsilon[0], xy[1], xs, ys, xy, uv[0], uv[1])) {
r_deriv[0][0] += r_uv[0] - uv[0];
r_deriv[1][0] += r_uv[1] - uv[1];
num++;
}
if (num > 0) {
float numinv = 1.0f / float(num);
r_deriv[0][0] *= numinv;
r_deriv[1][0] *= numinv;
}
num = 0;
if (read_displacement(xy[0], xy[1] + epsilon[1], xs, ys, xy, uv[0], uv[1])) {
r_deriv[0][1] += uv[0] - r_uv[0];
r_deriv[1][1] += uv[1] - r_uv[1];
num++;
}
if (read_displacement(xy[0], xy[1] - epsilon[1], xs, ys, xy, uv[0], uv[1])) {
r_deriv[0][1] += r_uv[0] - uv[0];
r_deriv[1][1] += r_uv[1] - uv[1];
num++;
}
if (num > 0) {
float numinv = 1.0f / float(num);
r_deriv[0][1] *= numinv;
r_deriv[1][1] *= numinv;
}
}
void DisplaceOperation::deinit_execution()
{
input_color_program_ = nullptr;
vector_read_fn_ = nullptr;
scale_x_read_fn_ = nullptr;
scale_y_read_fn_ = nullptr;
}
bool DisplaceOperation::determine_depending_area_of_interest(rcti *input,
ReadBufferOperation *read_operation,
rcti *output)
{
rcti color_input;
rcti vector_input;
NodeOperation *operation = nullptr;
/* the vector buffer only needs a 2x2 buffer. The image needs whole buffer */
/* image */
operation = get_input_operation(0);
color_input.xmax = operation->get_width();
color_input.xmin = 0;
color_input.ymax = operation->get_height();
color_input.ymin = 0;
if (operation->determine_depending_area_of_interest(&color_input, read_operation, output)) {
return true;
}
/* vector */
operation = get_input_operation(1);
vector_input.xmax = input->xmax + 1;
vector_input.xmin = input->xmin - 1;
vector_input.ymax = input->ymax + 1;
vector_input.ymin = input->ymin - 1;
if (operation->determine_depending_area_of_interest(&vector_input, read_operation, output)) {
return true;
}
/* scale x */
operation = get_input_operation(2);
if (operation->determine_depending_area_of_interest(input, read_operation, output)) {
return true;
}
/* scale y */
operation = get_input_operation(3);
if (operation->determine_depending_area_of_interest(input, read_operation, output)) {
return true;
}
return false;
}
void DisplaceOperation::get_area_of_interest(const int input_idx,
const rcti &output_area,
rcti &r_input_area)
{
switch (input_idx) {
case 0: {
r_input_area = get_input_operation(input_idx)->get_canvas();
break;
}
case 1: {
r_input_area = output_area;
expand_area_for_sampler(r_input_area, PixelSampler::Bilinear);
break;
}
default: {
r_input_area = output_area;
break;
}
}
}
void DisplaceOperation::update_memory_buffer_started(MemoryBuffer * /*output*/,
const rcti & /*area*/,
Span<MemoryBuffer *> inputs)
{
MemoryBuffer *vector = inputs[1];
MemoryBuffer *scale_x = inputs[2];
MemoryBuffer *scale_y = inputs[3];
vector_read_fn_ = [=](float x, float y, float *out) { vector->read_elem_bilinear(x, y, out); };
scale_x_read_fn_ = [=](float x, float y, float *out) { scale_x->read_elem_checked(x, y, out); };
scale_y_read_fn_ = [=](float x, float y, float *out) { scale_y->read_elem_checked(x, y, out); };
}
void DisplaceOperation::update_memory_buffer_partial(MemoryBuffer *output,
const rcti &area,
Span<MemoryBuffer *> inputs)
{
const MemoryBuffer *input_color = inputs[0];
for (BuffersIterator<float> it = output->iterate_with({}, area); !it.is_end(); ++it) {
const float xy[2] = {float(it.x), float(it.y)};
float uv[2];
float deriv[2][2];
pixel_transform(xy, uv, deriv);
if (is_zero_v2(deriv[0]) && is_zero_v2(deriv[1])) {
input_color->read_elem_bilinear(uv[0], uv[1], it.out);
}
else {
/* EWA filtering (without nearest it gets blurry with NO distortion). */
input_color->read_elem_filtered(uv[0], uv[1], deriv[0], deriv[1], it.out);
}
}
}
} // namespace blender::compositor
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