stuff-from-scratch/test/image/TestPngWriter.cpp

#include "Image.h"
#include "PngWriter.h"

#include "File.h"
#include "BitStream.h"
#include "ImagePrimitives.h"

#include <iostream>

int main()
{
    unsigned width = 20;
    unsigned height = 20;
    unsigned numChannels = 3;
    auto image = Image<unsigned char>::Create(width, height);
    image->setNumChannels(numChannels);

    std::vector<unsigned char> data(image->getBytesPerRow()*height, 0);

    ImagePrimitives::drawAlternatingStrips(data, width, height, numChannels, image->getBytesPerRow());
    image->setData(data);

    PngWriter writer;
    writer.setPath("test.png");
    writer.write(image);

    File test_file("test.png");
    test_file.SetAccessMode(File::AccessMode::Read);
    test_file.Open(true);

    while(auto byte = test_file.readNextByte())
    {
        std::cout << static_cast<unsigned>(*byte) << std::endl;
    }
    test_file.Close();

    return 0;
}