//

// Created by Дарья Фомина on 24.03.2023.

//

#include "MatrixFilter.h"

MatrixFilter::MatrixFilter() {

}

MatrixFilter::MatrixFilter(ssize_t dx, ssize_t dy, const std::vector<std::vector<double>> &matrix)

: dx_(dx), dy_(dy), matrix_(matrix) {

}

Image::Color MatrixFilter::Clamp(const Image::Color &need_clamp) {

Image::Color ans;

ans.r_ = std::min(RIGHT_BORDER, std::max(LEFT_BORDER, need_clamp.r_));

ans.g_ = std::min(RIGHT_BORDER, std::max(LEFT_BORDER, need_clamp.g_));

ans.b_ = std::min(RIGHT_BORDER, std::max(LEFT_BORDER, need_clamp.b_));

return ans;

}

Image MatrixFilter::Apply(const Image &base_image) {

Image ans(base_image.GetHeight(), base_image.GetWidth());

for (ssize_t y = 0; y < ans.GetHeight(); ++y) {

for (ssize_t x = 0; x < ans.GetWidth(); ++x) {

Image::Color set_color(LEFT_BORDER, LEFT_BORDER, LEFT_BORDER);

for (ssize_t i = 0; i < matrix_.size(); ++i) {

for (ssize_t j = 0; j < matrix_[0].size(); ++j) {

set_color += base_image.GetColor(x + dx_ + j, y + dy_ + i) * matrix_[i][j];

}

}

ans.SetColor(x, y, Clamp(set_color));

}

}

const int64_t padding_amount = static_cast<int64_t>((4 - ((ans.GetWidth() * 3) % 4)) % 4);

const size_t file_size = FILE_HEADER_SIZE + INFORMATION_HEADER_SIZE + ans.GetWidth() * ans.GetHeight() * 3 +

padding_amount * ans.GetHeight();

ans.SetFileSize(file_size);

return ans;

}