read-and-write.cr

require "gobject"
require_gobject "Vips"


def new_from_file(path : String) : Vips::Image
  img = Vips::Image.new_from_file_rw(path)
end

def write_to_file(img : Vips::Image, filename : String)
  LibVips.vips_image_write_to_file(img, filename)
end

lib LibVips
  # https://libvips.github.io/libvips/API/current/VipsImage.html#vips-image-write-to-file
  fun vips_image_write_to_file(image : LibVips::Image*, name : LibC::Char*)
end

puts "Reading image"
img = new_from_file("/home/frog/dhash-cr/test.jpg")
pp img
puts "Read img with width #{img.width} and height #{img.height}"

write_to_file(img, "out.jpg")