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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup freestyle
* \brief Class to represent a pyramid of images
*/
#include <iostream>
#include "GaussianFilter.h"
#include "Image.h"
#include "ImagePyramid.h"
#include "BLI_sys_types.h"
using namespace std;
namespace Freestyle {
#if 0
ImagePyramid::ImagePyramid(const GrayImage &level0, unsigned nbLevels)
{
BuildPyramid(level0, nbLevels);
}
#endif
ImagePyramid::ImagePyramid(const ImagePyramid & /*iBrother*/)
{
if (!_levels.empty()) {
for (vector<GrayImage *>::iterator im = _levels.begin(), imend = _levels.end(); im != imend;
++im) {
_levels.push_back(new GrayImage(**im));
}
}
}
ImagePyramid::~ImagePyramid()
{
if (!_levels.empty()) {
for (vector<GrayImage *>::iterator im = _levels.begin(), imend = _levels.end(); im != imend;
++im) {
delete (*im);
}
_levels.clear();
}
}
GrayImage *ImagePyramid::getLevel(int l)
{
return _levels[l];
}
float ImagePyramid::pixel(int x, int y, int level)
{
GrayImage *img = _levels[level];
if (0 == level) {
return img->pixel(x, y);
}
uint i = 1 << level;
uint sx = x >> level;
uint sy = y >> level;
if (sx >= img->width()) {
sx = img->width() - 1;
}
if (sy >= img->height()) {
sy = img->height() - 1;
}
// bilinear interpolation
float A = i * (sx + 1) - x;
float B = x - i * sx;
float C = i * (sy + 1) - y;
float D = y - i * sy;
float P1(0), P2(0);
P1 = A * img->pixel(sx, sy);
if (sx < img->width() - 1) {
if (x % i != 0) {
P1 += B * img->pixel(sx + 1, sy);
}
}
else {
P1 += B * img->pixel(sx, sy);
}
if (sy < img->height() - 1) {
if (y % i != 0) {
P2 = A * img->pixel(sx, sy + 1);
if (sx < img->width() - 1) {
if (x % i != 0) {
P2 += B * img->pixel(sx + 1, sy + 1);
}
}
else {
P2 += B * img->pixel(sx, sy + 1);
}
}
}
else {
P2 = P1;
}
return (1.0f / float(1 << (2 * level))) * (C * P1 + D * P2);
}
int ImagePyramid::width(int level)
{
return _levels[level]->width();
}
int ImagePyramid::height(int level)
{
return _levels[level]->height();
}
GaussianPyramid::GaussianPyramid(const GrayImage &level0, uint nbLevels, float iSigma)
{
_sigma = iSigma;
BuildPyramid(level0, nbLevels);
}
GaussianPyramid::GaussianPyramid(GrayImage *level0, uint nbLevels, float iSigma)
{
_sigma = iSigma;
BuildPyramid(level0, nbLevels);
}
GaussianPyramid::GaussianPyramid(const GaussianPyramid &iBrother) : ImagePyramid(iBrother)
{
_sigma = iBrother._sigma;
}
void GaussianPyramid::BuildPyramid(const GrayImage &level0, uint nbLevels)
{
GrayImage *pLevel = new GrayImage(level0);
BuildPyramid(pLevel, nbLevels);
}
void GaussianPyramid::BuildPyramid(GrayImage *level0, uint nbLevels)
{
GrayImage *pLevel = level0;
_levels.push_back(pLevel);
GaussianFilter gf(_sigma);
// build the nbLevels:
uint w = pLevel->width();
uint h = pLevel->height();
if (nbLevels != 0) {
for (uint i = 0; i < nbLevels; ++i) { // soc
w = pLevel->width() >> 1;
h = pLevel->height() >> 1;
GrayImage *img = new GrayImage(w, h);
for (uint y = 0; y < h; ++y) {
for (uint x = 0; x < w; ++x) {
float v = gf.getSmoothedPixel<GrayImage>(pLevel, 2 * x, 2 * y);
img->setPixel(x, y, v);
}
}
_levels.push_back(img);
pLevel = img;
}
}
else {
while ((w > 1) && (h > 1)) {
w = pLevel->width() >> 1;
h = pLevel->height() >> 1;
GrayImage *img = new GrayImage(w, h);
for (uint y = 0; y < h; ++y) {
for (uint x = 0; x < w; ++x) {
float v = gf.getSmoothedPixel<GrayImage>(pLevel, 2 * x, 2 * y);
img->setPixel(x, y, v);
}
}
_levels.push_back(img);
pLevel = img;
}
}
}
} /* namespace Freestyle */
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