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How to draw color emojis with love.graphics.print()
Posted: Sun Jul 05, 2020 12:52 am
by ki
Hi! Is it possible to draw color emojis with love.graphics.print(), and if yes, how? I couldn't get this attempt to work.
main.lua:
Code: Select all
local mainFont = love.graphics.newFont("Helvetica.ttc", 10)
local mainFontHasGlyphs = mainFont:hasGlyphs("👋")
print("Helvetica has waving hand sign: ", mainFontHasGlyphs) -- prints "false", which is expected
local emojiFont = love.graphics.newFont("Apple Color Emoji.ttc", 10)
local emojiFontHasGlyphs = emojiFont:hasGlyphs("👋")
print("Apple Color Emoji has waving hand sign: ", emojiFontHasGlyphs) -- prints "true", which is expected
function love.draw()
love.graphics.setFont(mainFont)
love.graphics.print("Hello world!", 100, 200)
love.graphics.setFont(emojiFont)
love.graphics.print("👋", 100, 300) -- this causes the error shown below.
end
The emoji is the waving hand sign (
https://emojipedia.org/waving-hand/).
The files "Helvetica.ttc" and "Apple Color Emoji.ttc" are copied from "/System/Library/Fonts/" (macOS) into the same folder as main.lua (source:
https://apple.stackexchange.com/a/214659).
The main.lua file is saved with the encoding UTF-8 without BOM.
Running the program results in the following error:
Code: Select all
Helvetica has waving hand sign: false
Apple Color Emoji has waving hand sign: true
Error: main.lua:15: TrueType Font glyph error: FT_Load_Glyph failed (0x7)
stack traceback:
[string "boot.lua"]:777: in function <[string "boot.lua"]:773>
[C]: in function 'print'
main.lua:15: in function 'draw'
[string "boot.lua"]:618: in function <[string "boot.lua"]:594>
[C]: in function 'xpcall'
Trying with a different font (Google's Noto Color Emoji, from
https://github.com/googlefonts/noto-emo ... ster/fonts) doesn't work either, though the error message is different:
Code: Select all
local notoFont = love.graphics.newFont("NotoColorEmoji.ttf", 10) -- results in an error with and without the size parameter
Result:
Code: Select all
Error: TrueType Font loading error: FT_Set_Pixel_Sizes failed: 0x17 (invalid size?)
stack traceback:
[string "boot.lua"]:777: in function <[string "boot.lua"]:773>
[C]: at 0x010b587b60
[C]: in function 'newFont'
main.lua:2: in main chunk
[C]: in function 'require'
[string "boot.lua"]:570: in function <[string "boot.lua"]:380>
[C]: in function 'xpcall'
[string "boot.lua"]:787: in function <[string "boot.lua"]:780>
[C]: in function 'xpcall'
However, it
is possible to draw a black and white emoji with the font "NotoEmoji-Regular.ttf".
Re: How to draw color emojis with love.graphics.print()
Posted: Tue Aug 04, 2020 10:54 am
by ki
Update: color fonts are currently not supported in Löve. There's a (closed) change issue here:
https://github.com/love2d/love/issues/1195
I guess it's possible to first convert emojis to images (with this tool for example:
https://onlineunicodetools.com/convert-emoji-to-image) and then using these images in Löve -- if you have a small and fixed set of emojis you want to use.
Re: How to draw color emojis with love.graphics.print()
Posted: Sat Aug 22, 2020 10:30 pm
by Sasha264
ki wrote: ↑Tue Aug 04, 2020 10:54 am
...and then using these images in Löve -- if you have a small and fixed set of emojis you want to use.
But after you have images (colored) that is not so easy task to embed them inline with a regular text as that smile
for example. I tried to do that in my game: I want to print text like that: "You will get 100 <gold_icon_here> when you bring me <potion_icon_here> small potion.", and I did not find easy solution for this.
Re: How to draw color emojis with love.graphics.print()
Posted: Mon Jan 17, 2022 1:29 pm
by dusoft
Bumping old thread - print / printf claims full support for UTF-8.
Emojis are part of UTF-8 now.
But I can not get them to print.
See:
https://love2d.org/imgmirrur/qM41JUK.html
Heart should be shown instead of unknown character / box.
Re: How to draw color emojis with love.graphics.print()
Posted: Mon Jan 17, 2022 1:49 pm
by dusoft
Actually, I tried an emoji font but to no avail, maybe it does not hint to sizes or something.
I went with saving emojis I need as images instead.
Re: How to draw color emojis with love.graphics.print()
Posted: Mon Jan 17, 2022 3:58 pm
by pgimeno
Fonts with colour emojis probably use features that Löve doesn't support. Try a using a font with B/W emoji support, like
https://github.com/googlefonts/noto-emo ... egular.ttf
Re: How to draw color emojis with love.graphics.print()
Posted: Mon Jan 17, 2022 5:41 pm
by dusoft
Thanks, tried that. Still no support for ZJW sequences, so images it is.
Re: How to draw color emojis with love.graphics.print()
Posted: Tue Jan 18, 2022 2:56 am
by ReFreezed
dusoft wrote: ↑Mon Jan 17, 2022 1:29 pm
Emojis are part of UTF-8 now.
Unicode, not UTF-8.
Also, a good thing about rendering emojis and other things using your own code is that you can go beyond what both LÖVE and Unicode provides, like animations, or interactable elements. Go nuts, to make your game as good as it can be, is what I'm saying!
Re: How to draw color emojis with love.graphics.print()
Posted: Tue Jan 18, 2022 10:00 am
by dusoft
ReFreezed wrote: ↑Tue Jan 18, 2022 2:56 am
dusoft wrote: ↑Mon Jan 17, 2022 1:29 pm
Emojis are part of UTF-8 now.
Unicode, not UTF-8.
Also, a good thing about rendering emojis and other things using your own code is that you can go beyond what both LÖVE and Unicode provides, like animations, or interactable elements. Go nuts, to make your game as good as it can be, is what I'm saying!
Thanks for the correction.
We could say this about any part of LÖVE :-) including basic stuff like drawing text on screen. But we all agree the engine should provide basic handling of text and images. I expected emojis to be part of that, but no big deal.
Re: How to draw color emojis with love.graphics.print()
Posted: Tue Jan 18, 2022 4:53 pm
by slime
At the time the original issue was created, there was almost no standardization in color emoji font formats, and libraries like FreeType barely had any support at all. It was not something love could reasonably support.
I believe the situation is a bit better now, but even so it seems like that Google font may still be using a nonstandard format (e.g.
https://github.com/googlefonts/noto-emoji/issues/43 ).
Given the lack of solid standardization, lack of standardized color fonts with licenses that allow people to ship them, lack of interest in the feature from game developers using love in general, and a supply of alternative color font formats which do work with love (BMFont and ImageFont), there hasn't been a lot of reason to invest my personal time into this feature over the past few years.
That's not to say we shouldn't give this a second look now that a few years have passed since the original issue was created, or that we won't accept outside contribution. I'm just speaking to where I spend my own personal time, and the history of the feature in general.
As for the original topic, perhaps some BMFont exporter programs may recognize emoji font glyphs and export them to a BMFont image+definition file. If so you could do that, since love's font/text system supports color BMFont files.