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bug#39340: 26.3; "Noto Emoji" font not displayed

From: ynyaaa
Subject: bug#39340: 26.3; "Noto Emoji" font not displayed
Date: Thu, 30 Jan 2020 14:13:47 +0900

Eli Zaretskii <address@hidden> writes:

>> From: address@hidden
>> Date: Wed, 29 Jan 2020 13:12:07 +0900
>> I installed Noto fonts including "Noto Emoji"(NotoEmoji-Regular.ttf).
>> Almost all glyphs defined in the font are not displayed.
>> Evaluating the following form, only "©® ⃣〰〽㊗㊙" can be displayed.
>>   (set-fontset-font t '(#x80 . #x1FFFF) "Noto Emoji")
>> Other characters listed below are displayed with other fonts or boxed
>> hex numbers.
> Please tell more details, in particular what do you mean by "can be
> displayed", and also which of the characters you show are displayed
> with other fonts and which with boxes with hex codepoints.

'C-u C-x =' on displayable characters shows a font name in *Help* buffer:
            character: © (displayed as ©) (codepoint 169, #o251, #xa9)
Emoji-normal-normal-normal-mono-13-*-*-*-c-*-iso8859-1 (#x11)
Starting with 'emacs -Q', the font name is shown as below.
            character: © (displayed as ©) (codepoint 169, #o251, #xa9)
New-normal-normal-normal-mono-13-*-*-*-c-*-iso8859-1 (#x8B)

As for U+20E3( ⃣:COMBINING ENCLOSING KEYCAP), the glyph in "Noto Emoji"
is drawn as a 3D button. I can see visually the glyph difference from
other fonts.

>> non-displayable characters
> What does "non-displayable" mean in this context?

I attach an HTML file noto-emoji.html, which contains characters easy to
see the difference, and screen shots of the file.

"Noto Emoji" does not have ASCII alphabets nor glyphs for characters
from U+1F641 to U+1F645.(It has ASCII digits.)

Using "Segoe UI Symbol", the characters can be displayed.

PNG files are screen shots under the following conditions.
    external browser
    emacs -Q -f menu-bar-mode -f tool-bar-mode -g 50x11 noto-emoji.html
    emacs -Q -f menu-bar-mode -f tool-bar-mode -g 50x11 \
        --eval "(set-frame-font \"Noto Emoji\")" noto-emoji.html
    emacs -Q -f menu-bar-mode -f tool-bar-mode -g 50x11 \
        --eval "(set-frame-font \"Segoe UI Symbol\")" noto-emoji.html

displayable: ©® ⃣〰〽㊗㊙
1F60x: 😀😁😂😃😄😅😆😇😈😉😊😋😌😍😎😏
1F61x: 😐😑😒😓😔😕😖😗😘😙😚😛😜😝😞😟
1F62x: 😠😡😢😣😤😥😦😧😨😩😪😫😬😭😮😯
1F63x: 😰😱😲😳😴😵😶😷😸😹😺😻😼😽😾😿
1F64x: 🙀🙁🙂🙃🙄🙅🙆🙇🙈🙉🙊🙋🙌🙍🙎🙏

Attachment: chrome.png
Description: PNG image

Attachment: emacs-default.png
Description: PNG image

Attachment: emacs-noto-emoji.png
Description: PNG image

Attachment: emacs-segoe-ui-symbol.png
Description: PNG image

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