#include "pch.h"
#include "log.h"
#include "image.h"
#include "asset.h"

#include <stb/stb_image.h>

using namespace ui;

bool Image::load(std::string filename)
{
    stbi_set_flip_vertically_on_load(false);
    Asset file;
    if (!(file.open(filename.c_str()) && file.read_all()))
    {
        file.close();
        return false;
    }
    uint8_t* buffer = stbi_load_from_memory(file.m_data, file.m_len, &width, &height, nullptr, 4);
    file.close();
    comp = 4;
    m_data = std::unique_ptr<uint8_t[]>(buffer);
    return true;
}

bool Image::load_file(std::string filename)
{
    stbi_set_flip_vertically_on_load(false);
    uint8_t* buffer = stbi_load(filename.c_str(), &width, &height, nullptr, 4);
    comp = 4;
    m_data = std::unique_ptr<uint8_t[]>(buffer);
    return true;
}

void Image::flip()
{
    auto flipped = std::make_unique<uint8_t[]>(width*height*4);
    int line_size = width * 4;
    const uint8_t* src = m_data.get();
    uint8_t* dst = flipped.get() + line_size * (height - 1);
    for (int y = 0; y < height; y++)
    {
        std::copy(src, src+line_size, dst);
        src += line_size;
        dst -= line_size;
    }
    std::swap(m_data, flipped);
}