Text filter that draws text with the given options

[vanbroup]

Closes: #9238

[vanbroup]

@bep I'm creating a Text filter that overlays the given text on an image according to the given options. I would like to hear your thoughts on the current approach, and specifically on how you would like to handle fonts.

I was thinking that fonts could be retrieved using the resources.Get function, from local storage or from a remote location such a Google Fonts. While the method below loads the font and passes it on as an option (as resources.resourceAdapter), this doesn't allow me to use it.

{{ $font := resources.Get "https://github.com/google/fonts/raw/main/apache/roboto/static/Roboto-Regular.ttf" }}
{{ $img := resources.Get "/images/open-graph-bg.png"}}
{{ $img = $img.Filter (images.Text "This text is placed over the image" (dict
    "color" "#ffffff"
    "size" 50
    "x" 100
    "y" 200
    "font" $font
))}}

[bep]

While the method below loads the font and passes it on as an option (as resources.resourceAdapter), this doesn't allow me to use it.

Without discussing if it's a great idea or not, I'm not sure what you mean by "doesn't allow me to use it"? You should be able to cast it to resource.Resource.

That said, I think this issue would be mentally easier to manage if we took it in two steps and just used the default font in the first iteration.

[bep]

If we drop the font discussion for a minute; I tested this, and it works pretty great.

{{ $img = $img.Filter (images.Text "This text is placed over the image" (dict
    "color" "#ffffff"
    "size" 50
    "x" 100
    "y" 200
))}}

Some comments after testing it:

1. I would expect x=0,y=0 to place the text in the upper left corner. Seems like the y is the bottom of the text and not the top.
2. I would expect images.Text "This text is placed over the image" to work without options with some sensible defaults.
3. I don't think the default should be italic text.

[vanbroup]

Agreed, addressed your comments

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