81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
#include "pch.h"
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#include "log.h"
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#include "image.h"
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#include "asset.h"
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#include <stb/stb_image.h>
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using namespace ui;
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bool Image::load(std::string filename)
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{
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stbi_set_flip_vertically_on_load(false);
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Asset file;
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if (!(file.open(filename.c_str()) && file.read_all()))
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{
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file.close();
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return false;
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}
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uint8_t* buffer = stbi_load_from_memory(file.m_data, file.m_len, &width, &height, nullptr, 4);
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file.close();
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comp = 4;
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m_data = std::unique_ptr<uint8_t[]>(buffer);
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return true;
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}
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bool Image::load_file(std::string filename)
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{
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stbi_set_flip_vertically_on_load(false);
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uint8_t* buffer = stbi_load(filename.c_str(), &width, &height, nullptr, 4);
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comp = 4;
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m_data = std::unique_ptr<uint8_t[]>(buffer);
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return true;
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}
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void Image::flip()
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{
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auto flipped = std::make_unique<uint8_t[]>(width*height*4);
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int line_size = width * 4;
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const uint8_t* src = m_data.get();
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uint8_t* dst = flipped.get() + line_size * (height - 1);
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for (int y = 0; y < height; y++)
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{
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std::copy(src, src+line_size, dst);
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src += line_size;
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dst -= line_size;
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}
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std::swap(m_data, flipped);
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}
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ui::Image ui::Image::resize(int w, int h)
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{
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Image ret;
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ret.create(w, h);
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auto temp = (glm::u8vec4*)ret.data();
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auto pixels = (glm::u8vec4*)data();
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float x_ratio = ((float)(width - 1)) / w;
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float y_ratio = ((float)(height - 1)) / h;
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int offset = 0;
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for (int i = 0; i < h; i++) {
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for (int j = 0; j < w; j++) {
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int x = (int)(x_ratio * j);
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int y = (int)(y_ratio * i);
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float x_diff = (x_ratio * j) - x;
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float y_diff = (y_ratio * i) - y;
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int index = y * width + x;
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// range is 0 to 255 thus bitwise AND with 0xff
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glm::vec4 A = pixels[index];
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glm::vec4 B = pixels[index + 1];
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glm::vec4 C = pixels[index + width];
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glm::vec4 D = pixels[index + width + 1];
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// Y = A(1-w)(1-h) + B(w)(1-h) + C(h)(1-w) + Dwh
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glm::vec4 gray = A*(1 - x_diff)*(1 - y_diff) + B * (x_diff)*(1 - y_diff) +
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C * (y_diff)*(1 - x_diff) + D * (x_diff*y_diff);
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temp[offset++] = glm::clamp(gray, glm::vec4(0), glm::vec4(255));
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}
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}
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return ret;
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}
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