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#include "image.h"
#include <cstddef>
#include <format>
#include <stb/stb_image.h>
#include <stdexcept>
Image::Image(const char * fileName, int flags) : width {}, height {}, numComponents {}
{
stbi_set_flip_vertically_on_load(1);
int w, h, nc;
unsigned char * bytes = stbi_load(fileName, &w, &h, &nc, flags);
width = static_cast<unsigned int>(w);
height = static_cast<unsigned int>(h);
numComponents = static_cast<unsigned int>(nc);
if (!bytes) {
throw std::runtime_error {std::format("Unable to load image: {}", fileName)};
}
data = {bytes, static_cast<size_t>(width * height * numComponents)};
}
Image::Image(std::span<unsigned char> buffer, int flags)
{
stbi_set_flip_vertically_on_load(1);
int w, h, nc;
unsigned char * bytes = stbi_load_from_memory(buffer.data(), static_cast<int>(buffer.size()), &w, &h, &nc, flags);
width = static_cast<unsigned int>(w);
height = static_cast<unsigned int>(h);
numComponents = static_cast<unsigned int>(nc);
if (!bytes) {
throw std::runtime_error {std::format("Unable to load image from memory buffer @ {} ({} bytes)",
static_cast<void *>(buffer.data()), buffer.size_bytes())};
}
data = {bytes, static_cast<size_t>(width * height * numComponents)};
}
Image::~Image()
{
stbi_image_free(data.data());
}
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