@dmitriid, just because you asked for it 
.
I added an option :autofit to Image.Text.text/2. You can try it using the main branch from GitHub for now (unless issues crop up I’ll recheck the documentation and publish on Sunday). The changelog entry is:
Enhancements
- Add
:autofit option to Image.Text.text/2. When set to true, text is rendered with Vix.Vips.Operation.text/2. The default, false, uses SVG rendering. There are pros and cons to both strategies. The main difference is that autofit: true will automatically size the text and perform line wrapping to fit the specified :width and :height. Thanks to @dmitriid for the suggestion!
Examples
# The base image
iex> {:ok, base_image} = Image.open("./test/support/images/Singapore-2016-09-5887.jpg")
# Text rendered in a 300x300 image, left aligned text, colored white
iex> {:ok, text} = Image.Text.text("Singapore skyline text in a 300x300 centred box",
...> height: 300, width: 300, autofit: true, text_fill_color: :white)
iex> {:ok, final_image} = Image.compose(base_image, text, x: :middle, y: :center)
# Text rendered in a 300x300 image, right aligned text, colored white
iex> {:ok, text} = Image.Text.text("Singapore skyline text in a 300x300 centred box",
...> height: 300, width: 300, autofit: true, text_fill_color: :white, justify: :right)
iex> {:ok, final_image} = Image.compose(base_image, text, x: :middle, y: :center)
# Text rendered in a 300x300 image, center aligned text, colored white
iex> {:ok, text} = Image.Text.text("Singapore skyline text in a 300x300 centred box",
...> height: 300, width: 300, autofit: true, text_fill_color: :white, justify: :center)
iex> {:ok, final_image} = Image.compose(base_image, text, x: :middle, y: :center)
# Text rendered in a 300x300 image, justified text, colored white
iex> {:ok, text} = Image.Text.text("Singapore skyline text in a 300x300 centred box",
...> height: 300, width: 300, autofit: true, text_fill_color: :white, justify: true)
iex> {:ok, final_image} = Image.compose(base_image, text, x: :middle, y: :center)
