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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2011 Blender Foundation. */
#include "COM_AntiAliasOperation.h"
namespace blender::compositor {
/* An implementation of the Scale3X edge-extrapolation algorithm.
*
* Code from GIMP plugin, based on code from Adam D. Moss <adam@gimp.org>
* licensed by the MIT license.
*/
static int extrapolate9(float *E0,
float *E1,
float *E2,
float *E3,
float *E4,
float *E5,
float *E6,
float *E7,
float *E8,
const float *A,
const float *B,
const float *C,
const float *D,
const float *E,
const float *F,
const float *G,
const float *H,
const float *I)
{
#define PEQ(X, Y) (fabsf(*X - *Y) < 1e-3f)
#define PCPY(DST, SRC) \
do { \
*DST = *SRC; \
} while (0)
if (!PEQ(B, H) && !PEQ(D, F)) {
if (PEQ(D, B)) {
PCPY(E0, D);
}
else {
PCPY(E0, E);
}
if ((PEQ(D, B) && !PEQ(E, C)) || (PEQ(B, F) && !PEQ(E, A))) {
PCPY(E1, B);
}
else {
PCPY(E1, E);
}
if (PEQ(B, F)) {
PCPY(E2, F);
}
else {
PCPY(E2, E);
}
if ((PEQ(D, B) && !PEQ(E, G)) || (PEQ(D, H) && !PEQ(E, A))) {
PCPY(E3, D);
}
else {
PCPY(E3, E);
}
PCPY(E4, E);
if ((PEQ(B, F) && !PEQ(E, I)) || (PEQ(H, F) && !PEQ(E, C))) {
PCPY(E5, F);
}
else {
PCPY(E5, E);
}
if (PEQ(D, H)) {
PCPY(E6, D);
}
else {
PCPY(E6, E);
}
if ((PEQ(D, H) && !PEQ(E, I)) || (PEQ(H, F) && !PEQ(E, G))) {
PCPY(E7, H);
}
else {
PCPY(E7, E);
}
if (PEQ(H, F)) {
PCPY(E8, F);
}
else {
PCPY(E8, E);
}
return 1;
}
return 0;
#undef PEQ
#undef PCPY
}
AntiAliasOperation::AntiAliasOperation()
{
this->add_input_socket(DataType::Value);
this->add_output_socket(DataType::Value);
value_reader_ = nullptr;
flags_.complex = true;
}
void AntiAliasOperation::init_execution()
{
value_reader_ = this->get_input_socket_reader(0);
}
void AntiAliasOperation::execute_pixel(float output[4], int x, int y, void *data)
{
MemoryBuffer *input_buffer = (MemoryBuffer *)data;
const int buffer_width = input_buffer->get_width(), buffer_height = input_buffer->get_height();
if (y < 0 || y >= buffer_height || x < 0 || x >= buffer_width) {
output[0] = 0.0f;
}
else {
const float *buffer = input_buffer->get_buffer();
const float *row_curr = &buffer[y * buffer_width];
if (x == 0 || x == buffer_width - 1 || y == 0 || y == buffer_height - 1) {
output[0] = row_curr[x];
return;
}
const float *row_prev = &buffer[(y - 1) * buffer_width],
*row_next = &buffer[(y + 1) * buffer_width];
float ninepix[9];
if (extrapolate9(&ninepix[0],
&ninepix[1],
&ninepix[2],
&ninepix[3],
&ninepix[4],
&ninepix[5],
&ninepix[6],
&ninepix[7],
&ninepix[8],
&row_prev[x - 1],
&row_prev[x],
&row_prev[x + 1],
&row_curr[x - 1],
&row_curr[x],
&row_curr[x + 1],
&row_next[x - 1],
&row_next[x],
&row_next[x + 1])) {
/* Some rounding magic to so make weighting correct with the
* original coefficients.
*/
uchar result = ((3 * ninepix[0] + 5 * ninepix[1] + 3 * ninepix[2] + 5 * ninepix[3] +
6 * ninepix[4] + 5 * ninepix[5] + 3 * ninepix[6] + 5 * ninepix[7] +
3 * ninepix[8]) *
255.0f +
19.0f) /
38.0f;
output[0] = result / 255.0f;
}
else {
output[0] = row_curr[x];
}
}
}
void AntiAliasOperation::deinit_execution()
{
value_reader_ = nullptr;
}
bool AntiAliasOperation::determine_depending_area_of_interest(rcti *input,
ReadBufferOperation *read_operation,
rcti *output)
{
rcti image_input;
NodeOperation *operation = get_input_operation(0);
image_input.xmax = input->xmax + 1;
image_input.xmin = input->xmin - 1;
image_input.ymax = input->ymax + 1;
image_input.ymin = input->ymin - 1;
return operation->determine_depending_area_of_interest(&image_input, read_operation, output);
}
void *AntiAliasOperation::initialize_tile_data(rcti *rect)
{
return get_input_operation(0)->initialize_tile_data(rect);
}
void AntiAliasOperation::get_area_of_interest(const int input_idx,
const rcti &output_area,
rcti &r_input_area)
{
BLI_assert(input_idx == 0);
UNUSED_VARS_NDEBUG(input_idx);
r_input_area.xmax = output_area.xmax + 1;
r_input_area.xmin = output_area.xmin - 1;
r_input_area.ymax = output_area.ymax + 1;
r_input_area.ymin = output_area.ymin - 1;
}
void AntiAliasOperation::update_memory_buffer_partial(MemoryBuffer *output,
const rcti &area,
Span<MemoryBuffer *> inputs)
{
const MemoryBuffer *input = inputs[0];
const rcti &input_area = input->get_rect();
float ninepix[9];
for (int y = area.ymin; y < area.ymax; y++) {
float *out = output->get_elem(area.xmin, y);
const float *row_curr = input->get_elem(area.xmin, y);
const float *row_prev = row_curr - input->row_stride;
const float *row_next = row_curr + input->row_stride;
int x_offset = 0;
for (int x = area.xmin; x < area.xmax;
x++, out += output->elem_stride, x_offset += input->elem_stride) {
if (x == input_area.xmin || x == input_area.xmax - 1 || y == input_area.xmin ||
y == input_area.ymax - 1) {
out[0] = row_curr[x_offset];
continue;
}
if (extrapolate9(&ninepix[0],
&ninepix[1],
&ninepix[2],
&ninepix[3],
&ninepix[4],
&ninepix[5],
&ninepix[6],
&ninepix[7],
&ninepix[8],
&row_prev[x_offset - input->elem_stride],
&row_prev[x_offset],
&row_prev[x_offset + input->elem_stride],
&row_curr[x_offset - input->elem_stride],
&row_curr[x_offset],
&row_curr[x_offset + input->elem_stride],
&row_next[x_offset - input->elem_stride],
&row_next[x_offset],
&row_next[x_offset + input->elem_stride])) {
/* Some rounding magic to make weighting correct with the
* original coefficients. */
uchar result = ((3 * ninepix[0] + 5 * ninepix[1] + 3 * ninepix[2] + 5 * ninepix[3] +
6 * ninepix[4] + 5 * ninepix[5] + 3 * ninepix[6] + 5 * ninepix[7] +
3 * ninepix[8]) *
255.0f +
19.0f) /
38.0f;
out[0] = result / 255.0f;
}
else {
out[0] = row_curr[x_offset];
}
}
}
}
} // namespace blender::compositor
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