Unexpected outcomes when using RTL in Löve12

[0azizi0]

It seems that Font:setFallbacks( ) is complicated in how it works in the background, I tested it more to see if it works perfectly with RTL languages when used together with LTR fonts. And I apologize for not testing it thoroughly the first time. The results as follows:

• When RTL (Arabic for example) font used as the fallback, its words are displayed correctly, but organized wrongly from left to right and with no spaces between the words.

It's supposed to look like this "اختبار العربية".

• When LTR (English for example) font used as the fallback, its words are displayed and organized correctly, but with no spaces between them.

• A Third case is, if you print both texts in one string, the result will be different depending on who is the primary font or the fallback font, or who you started writing with.

This is the code, switch the order of the fonts and comment/uncomment the prints as you see fit.

local love = require("love")

local font = love.graphics.newFont("NotoSans-Regular.ttf", 30)
local fallback = love.graphics.newFont("NotoNaskhArabic-Regular.ttf", 30)
love.graphics.setFont(font)
font:setFallbacks(fallback)

function love.draw()
    love.graphics.print("اختبار العربية")
    love.graphics.print("Hello world")
    love.graphics.print("اختبار العربية Hello world")
end

There is another problem, it happens when using love.graphics.printf. It happens with RTL (Arabic in this case) and not LTR fonts. It displays the text like this when using a big limit:

I used this code:

local love = require("love")

local font = love.graphics.newFont("NotoNaskhArabic-Regular.ttf", 30)
love.graphics.setFont(font)

function love.draw()
    love.graphics.printf("اختبار العربية", 0, 0, 900, "right") -- This line will display correctly in vscode
end

The fonts here to test with.

[HDPLocust]

Huh, there is one BIG topic about this
https://faultlore.com/blah/text-hates-you/
So I guess love2d needs a big beautiful handmade font rendering framework to support this.
Or not.

[0azizi0]

The current version (LÖVE 11.4) actually has good support for font and text rendering, it also supports unicode. What is missing from the current system is support for text direction and shaping, which can be done manually. With LÖVE 12, support for HarfBuzz was added and the mentioned shortcomings should be gone, it only needs testing and fixing to make sure it's working as intended.

[HDPLocust]

With LÖVE 12, support for HarfBuzz was added and the mentioned shortcomings should be gone, it only needs testing and fixing to make sure it's working as intended.

Woah, harfbuzz is good news

[slime73]

48e23a0 seems to have fixed the printf wrapping issue.

[0azizi0]

Yes it works. But there is a small issue, by wrapping it takes with it the last letter from the previous word:

it's supposed to look like this:

You can test it using the code above and change the limit to 100. Thanks (شكرا).