[webkit-changes] [292522] trunk

Wed, 06 Apr 2022 19:45:00 -0700

Title: [292522] trunk
Revision
292522
Author
mmaxfi...@apple.com
Date
2022-04-06 19:44:11 -0700 (Wed, 06 Apr 2022)

Log Message

NBSP characters drawn in fonts that don't support the space character turn into boxes
https://bugs.webkit.org/show_bug.cgi?id=238836
<rdar://problem/91130503>

Reviewed by Alan Bujtas.

Source/WebCore:

We have some historical code in WebKit where we swap out the non-breaking space glyph
for the space glyphs when rendering. This is not what the other browsers do; they will
faithfully render the non-breaking space glyph. This patch aligns with the other
browsers.

This patch also fixes a similar problem with tab characters. Other browsers never
render any visible tab glyphs, even if the font has a visible glyph for the tab
character. This patch implements this.

This patch also only clobbers the glyphs used for carriageReturn and newlineCharacter
if the replacement glyph exists.

Test: fast/text/nbsp-no-space.html

* platform/graphics/WidthIterator.cpp:
(WebCore::WidthIterator::applyCSSVisibilityRules):

LayoutTests:

* fast/text/nbsp-no-space-expected.html: Added.
* fast/text/nbsp-no-space.html: Added.
* fast/text/resources/Ahem-nbsp-no-space.ttf: Added. Supports NBSP but not space.
* fast/text/resources/Ahem-visible-tab-and-space.ttf: Added. Has visible glyphs for tab and space.

Modified Paths

Added Paths

Diff

Modified: trunk/LayoutTests/ChangeLog (292521 => 292522)


--- trunk/LayoutTests/ChangeLog	2022-04-07 02:18:01 UTC (rev 292521)
+++ trunk/LayoutTests/ChangeLog	2022-04-07 02:44:11 UTC (rev 292522)
@@ -1,3 +1,16 @@
+2022-04-06  Myles C. Maxfield  <mmaxfi...@apple.com>
+
+        NBSP characters drawn in fonts that don't support the space character turn into boxes
+        https://bugs.webkit.org/show_bug.cgi?id=238836
+        <rdar://problem/91130503>
+
+        Reviewed by Alan Bujtas.
+
+        * fast/text/nbsp-no-space-expected.html: Added.
+        * fast/text/nbsp-no-space.html: Added.
+        * fast/text/resources/Ahem-nbsp-no-space.ttf: Added. Supports NBSP but not space.
+        * fast/text/resources/Ahem-visible-tab-and-space.ttf: Added. Has visible glyphs for tab and space.
+
 2022-04-06  Andres Gonzalez  <andresg...@apple.com>
 
         [ Mac ] accessibility/mac/expanded-notification.html is a flaky text failure

Added: trunk/LayoutTests/fast/text/nbsp-no-space-expected.html (0 => 292522)


--- trunk/LayoutTests/fast/text/nbsp-no-space-expected.html	                        (rev 0)
+++ trunk/LayoutTests/fast/text/nbsp-no-space-expected.html	2022-04-07 02:44:11 UTC (rev 292522)
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+<head>
+<style>
+@font-face {
+    font-family: "WebFont";
+    src: url("resources/Ahem-nbsp-no-space.ttf") format("truetype");
+}
+</style>
+</head>
+<body>
+This test makes sure that the nbsp glyph is used in a font if the space glyph is unavailable. The test passes if this text you're reading right now is the only text on the page.
+</body>
+</html>

Added: trunk/LayoutTests/fast/text/nbsp-no-space.html (0 => 292522)


--- trunk/LayoutTests/fast/text/nbsp-no-space.html	                        (rev 0)
+++ trunk/LayoutTests/fast/text/nbsp-no-space.html	2022-04-07 02:44:11 UTC (rev 292522)
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<style>
+@font-face {
+    font-family: "WebFont";
+    src: url("resources/Ahem-nbsp-no-space.ttf") format("truetype");
+}
+@font-face {
+    font-family: "WebFont2";
+    src: url("resources/Ahem-visible-tab-and-space.ttf") format("truetype");
+}
+</style>
+</head>
+<body>
+This test makes sure that the nbsp glyph is used in a font if the space glyph is unavailable. The test passes if this text you're reading right now is the only text on the page.
+<div style="font: 48px 'WebFont';">&nbsp;</div>
+<div style="font: 48px 'WebFont2'; white-space: pre;">&#x9;</div>
+</body>
+</html>

Added: trunk/LayoutTests/fast/text/resources/Ahem-nbsp-no-space.ttf (0 => 292522)


--- trunk/LayoutTests/fast/text/resources/Ahem-nbsp-no-space.ttf	                        (rev 0)
+++ trunk/LayoutTests/fast/text/resources/Ahem-nbsp-no-space.ttf	2022-04-07 02:44:11 UTC (rev 292522)
@@ -0,0 +1,44 @@
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+X	$/d	R/\x88	/\xDA	/\xE2	/\xF0The Ahem font belongs to the public domain. In jurisdictions that do not recognize public domain ownership of these files, the following Creative Commons Zero declaration applies: http://labs.creativecommons.org/licenses/zero-waive/1.0/us/legalcodeAhemRegularVersion 1.50 AhemAhemVersion 1.50AhemThe 
 Ahem font was developed by Todd Fahrner and Myles C. Maxfield to help test writers develop predictable tests. The units per em is 1000, the advance is 800, and 
 the descent is 200, thereby making the em square exactly square. The glyphs for most characters is simply a box which fills this square. The codepoints mapped to this full square with a full advance are the following ranges: U+20-U+26, U+28-U+6F, U+71-U+7E, U+A0-U+C8, U+CA-U+FF, U+131, U+152-U+153, U+178, U+192, U+2C6-U+2C7, U+2C9,
  U+2D8-U+2DD, U+394, U+3A5, U+3A7, U+3A9, U+3BC, U+3C0, U+2013-U+2014, U+2018-U+201A, U+201C-U+201E, U+2020-U+2022, U+2026, U+2030, U+2039-U+203A, U+2044, U+2122, U+2
 126, U+2202, U+2206, U+220F, U+2211-U+2212, U+2219-U+221A, U+221E, U+222B, U+2248, U+2260, U+2264-U+2265, U+22F2, U+25CA, U+3007, U+4E00, U+4E03, U+4E09, U+4E5D, U+4E8C, U+4E94, U+516B, U+516D, U+5341, U+56D7, U+56DB, U+571F, U+6728, U+6C34, U+706B, U+91D1, U+F000-U+F002. The codepoints which are mapped to something else are the f
 ollowing: " " (U+20): No path but full advance; "p" (U+70): Path has 0 ascent but full descent; "\xC9" (U+C9): Path has 0 descent but full ascent; Non-br
 eaking space (U+A0): No path but full advance; Zero-width non-breaking space (U+FEFF): No path and 0 advance; En space (U+2002): No path and half advance; Em space (U+2003): No path but full advance; Three-per-em space (U+2004): No path and one third advance; Four-per-em space (U+2005): No path and one quarter advance; Six-per-em 
 space (U+2006): No path and one sixth advance; Thin space (U+2009): No path and one fifth advance; Hair space (U+200A): No path and one tenth advance; Zero width spac
 e (U+200B): No path and no advance; Ideographic space (U+3000): No path but full advance; Zero width non-joiner (U+200C): No path and no advance; Zero width joiner (U+200D): No path and no advance; Greek capital letter Chi (U+3A7): Thin horizontal stripe and full advance; (U+6A2A): Thin horizontal stripe and full advance; Greek cap
 ital letter Upsilon (U+3A5): Thin vertical stripe and full advance; (U+7EB5): Thin vertical stripe and full advance.http://www.w3c.orghttp://dev.w3.org/CSS/fonts/ahem
 /COPYING
+The Ahem font belongs to the public domain. In jurisdictions that do not recognize public domain ownership of these files, the following Creative Commons Zero declaration applies: http://labs.creativecommons.org/licenses/zero-waive/1.0/us/legalcodeAhemRegularVersion 1.50 AhemAhemVersion 1.50AhemThe Ahem font was developed by Todd Fahrner and Myles C. Maxfield to help test writers develop predictable tests. The units per em is 1000, the advance is 800, and the descent is 200, thereby making the em square exactly square. The glyphs for most characters is simply a box which fills this square. The codepoints mapped to this full square with a full advance are the following ranges: U+20-U+26, U+28-U+6F, U+71-U+7E, U+A0-U+C8, U+CA-U+FF, U+131, U+152-U+153, U+178, U+192, U+2C6-U+2C7, U+2C9, U+2D8-U+2DD, U+394, U+3A5, U+3A7, U+3A9, U+3BC, U+3C0, U+2013-U+2014, U+2018-U+201A, U+201C-U+201E, U+2020-U+2022, U+2026, U+2030, U+2039-U+203A, U+2044, U+2122, U+2126, U+2202, U+2206, U+220F, U+2211-U+
 2212, U+2219-U+221A, U+221E, U+222B, U+2248, U+2260, U+2264-U+2265, U+22F2, U+25CA, U+3007, U+4E00, U+4E03, U+4E09, U+4E5D, U+4E8C, U+4E94, U+516B, U+516D, U+5341, U+56D7, U+56DB, U+571F, U+6728, U+6C34, U+706B, U+91D1, U+F000-U+F002. The codepoints which are mapped to something else are the following: " " (U+20): No path but full advance; "p" (U+70): Path has 0 ascent but full descent; "\x83" (U+C9): Path has 0 descent but full ascent; Non-breaking space (U+A0): No path but full advance; Zero-width non-breaking space (U+FEFF): No path and 0 advance; En space (U+2002): No path and half advance; Em space (U+2003): No path but full advance; Three-per-em space (U+2004): No path and one third advance; Four-per-em space (U+2005): No path and one quarter advance; Six-per-em space (U+2006): No path and one sixth advance; Thin space (U+2009): No path and one fifth advance; Hair space (U+200A): No path and one tenth advance; Zero width space (U+200B): No path an
 d no advance; Ideographic space (U+3000): No path but full advance; Zero width non-joiner (U+200C): No path and no advance; Zero width joiner (U+200D): No path and no advance; Greek capital letter Chi (U+3A7): Thin horizontal stripe and full advance; (U+6A2A): Thin horizontal stripe and full advance; Greek capital letter Upsilon (U+3A5): Thin vertical stripe and full advance; (U+7EB5): Thin vertical stripe and full advance.http://www.w3c.orghttp://dev.w3.org/CSS/fonts/ahem/COPYING
+AhemRegularAhemThe Ahem font belongs to the public domain. In jurisdictions that do not recognize public domain ownership of these files, the following Creative Commons Zero declaration applies: http://labs.creativecommons.org/licenses/zero-waive/1.0/us/legalcodeAhemRegularVersion 1.50 AhemAhemVersion 1.50AhemThe Ahem font was developed by 
 Todd Fahrner and Myles C. Maxfield to help test writers develop predictable tests. The units per em is 1000, the advance is 800, and the descent is 200, thereby mak
 ing the em square exactly square. The glyphs for most characters is simply a box which fills this square. The codepoints mapped to this full square with a full advance are the following ranges: U+20-U+26, U+28-U+6F, U+71-U+7E, U+A0-U+C8, U+CA-U+FF, U+131, U+152-U+153, U+178, U+192, U+2C6-U+2C7, U+2C9, U+2D8-U+2DD, U+394, U+3A5, U+
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 +2211-U+2212, U+2219-U+221A, U+221E, U+222B, U+2248, U+2260, U+2264-U+2265, U+22F2, U+25CA, U+3007, U+4E00, U+4E03, U+4E09, U+4E5D, U+4E8C, U+4E94, U+516B, U+516D, U+5341, U+56D7, U+56DB, U+571F, U+6728, U+6C34, U+706B, U+91D1, U+F000-U+F002. The codepoints which are mapped to something else are the following: " " (U+20): No pa
 th but full advance; "p" (U+70): Path has 0 ascent but full descent; "\xC9" (U+C9): Path has 0 descent but full ascent; Non-breaking space (U+A0): No path b
 ut full advance; Zero-width non-breaking space (U+FEFF): No path and 0 advance; En space (U+2002): No path and half advance; Em space (U+2003): No path but full advance; Three-per-em space (U+2004): No path and one third advance; Four-per-em space (U+2005): No path and one quarter advance; Six-per-em space (U+2006): No path and one
  sixth advance; Thin space (U+2009): No path and one fifth advance; Hair space (U+200A): No path and one tenth advance; Zero width space (U+200B): No path and no adva
 nce; Ideographic space (U+3000): No path but full advance; Zero width non-joiner (U+200C): No path and no advance; Zero width joiner (U+200D): No path and no advance; Greek capital letter Chi (U+3A7): Thin horizontal stripe and full advance; (U+6A2A): Thin horizontal stripe and full advance; Greek capital letter Upsilon (U+3A5): T
 hin vertical stripe and full advance; (U+7EB5): Thin vertical stripe and full advance.http://www.w3c.orghttp://dev.w3.org/CSS/fonts/ahem/COPYING
+AhemRegularAhem\xFF{	+ !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x80\x81\x83\x84\x85\x86\x88\x89\x8A\x8B\x8D\x8E\x90\x91\x93\x96\x97\x9D\x9E\xA0\xA1\xA2\xA3\xA4\xA9\xAA\xAC\xAD\xAE\xAF\xB6\xB7\xB8\xBA\xBD\xC3\xC7\xC8\xC9\xCA\xCB\xCC\xCD\xCE\xCF\xD0\xD1\xD3\xD4\xD5\xD6\xD7\xD8\xD9\xDA\xDB\xDC\xDD\xDE\xDF\xE0\xE1\xE8\xE9\xEA\xEB\xEC\xED\xEE\xEF\xF0\xF1\xF2\xF3\xF4\xF5\xF6\xB0\xB1\xBB\x
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++ !"#$%&'(NULLglyph243glyph204glyph205HTDELuniFEFFuni2002uni2003uni2004uni2005uni2006uni2009uni200Auni200Buni3000	afii61664afii301uni4E00uni4E8Cuni4E09uni56DBuni4E94uni516Duni4E03uni516Buni4E5Duni5341uni3007uni56D7uni706Buni6C34uni6728uni91D1uni571Funi03A7uni6A2Auni03A5uni7EB5
\ No newline at end of file

Added: trunk/LayoutTests/fast/text/resources/Ahem-visible-tab-and-space.ttf (0 => 292522)


--- trunk/LayoutTests/fast/text/resources/Ahem-visible-tab-and-space.ttf	                        (rev 0)
+++ trunk/LayoutTests/fast/text/resources/Ahem-visible-tab-and-space.ttf	2022-04-07 02:44:11 UTC (rev 292522)
@@ -0,0 +1,48 @@
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 8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 
 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 
 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE81!!\xE8\xFC\xC8\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\
 xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC 
 \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xE8 !!\xE8\xFC \xFC\xE0\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC
 \xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF
 8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 
 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 
 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xC8\xFF8\x90 3#\xC8\xC8\xC8 \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!
 \xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE
 8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \x
 FC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC
 \xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xF
 F8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE
 8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 
 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\
 xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC 
 \xFC\xFF8\xE8 !!\xE8\xFC \xFC\xFF8\xE8 !!\xE8\xFC \xFC\x90\xE8X!!\xE8\xFCX\xC
 8\x90\xE8X!!\xE8\xFCX\xC8\xC8\xFF8\x90 3#\xC8\xC8\xC8 \xFC\xC8\xFF8\x90 3#\xC8\xC8\xC8 \xFC\xC8\xFF8\x90 3#\xC8\xC8\xC8 \xFC\x80G\xAA\xA6_<\xF5	\xE8\xB3o_Y\xC4ݫ$\xFF8\xE8  \xFF8\xE8\xE8\xE8}\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8
 \xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE
 8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\xE8\
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+
+
+!
+.
+;
+H
+U
+b
+o
+|
+\x89
+\x96
+\xA3
+\xB0
+\xBD
+\xCA
+\xD7
+\xE4
+\xF1
+\xFE%2?LYfs\x80\x8D\x9A\xA7\xB4\xC1\xCE\xDB\xE8\xF5)6CP]]]]]]]]]]]]]jw\x84\x91\x9E\xAB\xB8\xC5\xD2\xDF\xEC\xF9+++ +-+:+G+T+a+n+{$\xB6\xF0\xF0\xF8"(0H
+XP$\xA8R\xCC\xF8!26B
+,Fr)\x84\xAD\xB1\xB8	\xF0\xBC	\xAC	\xB4	"\xC2	\xE4	\xEC		
+X	$/d	R/\x88	/\xDA	/\xE2	/\xF0The Ahem font belongs to the public domain. In jurisdictions that do not recognize public domain ownership of these files, the following Creative Commons Zero declaration applies: http://labs.creativecommons.org/licenses/zero-waive/1.0/us/legalcodeAhemRegularVersion 1.50 AhemAhemVersion 1.50AhemThe 
 Ahem font was developed by Todd Fahrner and Myles C. Maxfield to help test writers develop predictable tests. The units per em is 1000, the advance is 800, and 
 the descent is 200, thereby making the em square exactly square. The glyphs for most characters is simply a box which fills this square. The codepoints mapped to this full square with a full advance are the following ranges: U+20-U+26, U+28-U+6F, U+71-U+7E, U+A0-U+C8, U+CA-U+FF, U+131, U+152-U+153, U+178, U+192, U+2C6-U+2C7, U+2C9,
  U+2D8-U+2DD, U+394, U+3A5, U+3A7, U+3A9, U+3BC, U+3C0, U+2013-U+2014, U+2018-U+201A, U+201C-U+201E, U+2020-U+2022, U+2026, U+2030, U+2039-U+203A, U+2044, U+2122, U+2
 126, U+2202, U+2206, U+220F, U+2211-U+2212, U+2219-U+221A, U+221E, U+222B, U+2248, U+2260, U+2264-U+2265, U+22F2, U+25CA, U+3007, U+4E00, U+4E03, U+4E09, U+4E5D, U+4E8C, U+4E94, U+516B, U+516D, U+5341, U+56D7, U+56DB, U+571F, U+6728, U+6C34, U+706B, U+91D1, U+F000-U+F002. The codepoints which are mapped to something else are the f
 ollowing: " " (U+20): No path but full advance; "p" (U+70): Path has 0 ascent but full descent; "\xC9" (U+C9): Path has 0 descent but full ascent; Non-br
 eaking space (U+A0): No path but full advance; Zero-width non-breaking space (U+FEFF): No path and 0 advance; En space (U+2002): No path and half advance; Em space (U+2003): No path but full advance; Three-per-em space (U+2004): No path and one third advance; Four-per-em space (U+2005): No path and one quarter advance; Six-per-em 
 space (U+2006): No path and one sixth advance; Thin space (U+2009): No path and one fifth advance; Hair space (U+200A): No path and one tenth advance; Zero width spac
 e (U+200B): No path and no advance; Ideographic space (U+3000): No path but full advance; Zero width non-joiner (U+200C): No path and no advance; Zero width joiner (U+200D): No path and no advance; Greek capital letter Chi (U+3A7): Thin horizontal stripe and full advance; (U+6A2A): Thin horizontal stripe and full advance; Greek cap
 ital letter Upsilon (U+3A5): Thin vertical stripe and full advance; (U+7EB5): Thin vertical stripe and full advance.http://www.w3c.orghttp://dev.w3.org/CSS/fonts/ahem
 /COPYING
+The Ahem font belongs to the public domain. In jurisdictions that do not recognize public domain ownership of these files, the following Creative Commons Zero declaration applies: http://labs.creativecommons.org/licenses/zero-waive/1.0/us/legalcodeAhemRegularVersion 1.50 AhemAhemVersion 1.50AhemThe Ahem font was developed by Todd Fahrner and Myles C. Maxfield to help test writers develop predictable tests. The units per em is 1000, the advance is 800, and the descent is 200, thereby making the em square exactly square. The glyphs for most characters is simply a box which fills this square. The codepoints mapped to this full square with a full advance are the following ranges: U+20-U+26, U+28-U+6F, U+71-U+7E, U+A0-U+C8, U+CA-U+FF, U+131, U+152-U+153, U+178, U+192, U+2C6-U+2C7, U+2C9, U+2D8-U+2DD, U+394, U+3A5, U+3A7, U+3A9, U+3BC, U+3C0, U+2013-U+2014, U+2018-U+201A, U+201C-U+201E, U+2020-U+2022, U+2026, U+2030, U+2039-U+203A, U+2044, U+2122, U+2126, U+2202, U+2206, U+220F, U+2211-U+
 2212, U+2219-U+221A, U+221E, U+222B, U+2248, U+2260, U+2264-U+2265, U+22F2, U+25CA, U+3007, U+4E00, U+4E03, U+4E09, U+4E5D, U+4E8C, U+4E94, U+516B, U+516D, U+5341, U+56D7, U+56DB, U+571F, U+6728, U+6C34, U+706B, U+91D1, U+F000-U+F002. The codepoints which are mapped to something else are the following: " " (U+20): No path but full advance; "p" (U+70): Path has 0 ascent but full descent; "\x83" (U+C9): Path has 0 descent but full ascent; Non-breaking space (U+A0): No path but full advance; Zero-width non-breaking space (U+FEFF): No path and 0 advance; En space (U+2002): No path and half advance; Em space (U+2003): No path but full advance; Three-per-em space (U+2004): No path and one third advance; Four-per-em space (U+2005): No path and one quarter advance; Six-per-em space (U+2006): No path and one sixth advance; Thin space (U+2009): No path and one fifth advance; Hair space (U+200A): No path and one tenth advance; Zero width space (U+200B): No path an
 d no advance; Ideographic space (U+3000): No path but full advance; Zero width non-joiner (U+200C): No path and no advance; Zero width joiner (U+200D): No path and no advance; Greek capital letter Chi (U+3A7): Thin horizontal stripe and full advance; (U+6A2A): Thin horizontal stripe and full advance; Greek capital letter Upsilon (U+3A5): Thin vertical stripe and full advance; (U+7EB5): Thin vertical stripe and full advance.http://www.w3c.orghttp://dev.w3.org/CSS/fonts/ahem/COPYING
+AhemRegularAhemThe Ahem font belongs to the public domain. In jurisdictions that do not recognize public domain ownership of these files, the following Creative Commons Zero declaration applies: http://labs.creativecommons.org/licenses/zero-waive/1.0/us/legalcodeAhemRegularVersion 1.50 AhemAhemVersion 1.50AhemThe Ahem font was developed by 
 Todd Fahrner and Myles C. Maxfield to help test writers develop predictable tests. The units per em is 1000, the advance is 800, and the descent is 200, thereby mak
 ing the em square exactly square. The glyphs for most characters is simply a box which fills this square. The codepoints mapped to this full square with a full advance are the following ranges: U+20-U+26, U+28-U+6F, U+71-U+7E, U+A0-U+C8, U+CA-U+FF, U+131, U+152-U+153, U+178, U+192, U+2C6-U+2C7, U+2C9, U+2D8-U+2DD, U+394, U+3A5, U+
 3A7, U+3A9, U+3BC, U+3C0, U+2013-U+2014, U+2018-U+201A, U+201C-U+201E, U+2020-U+2022, U+2026, U+2030, U+2039-U+203A, U+2044, U+2122, U+2126, U+2202, U+2206, U+220F, U
 +2211-U+2212, U+2219-U+221A, U+221E, U+222B, U+2248, U+2260, U+2264-U+2265, U+22F2, U+25CA, U+3007, U+4E00, U+4E03, U+4E09, U+4E5D, U+4E8C, U+4E94, U+516B, U+516D, U+5341, U+56D7, U+56DB, U+571F, U+6728, U+6C34, U+706B, U+91D1, U+F000-U+F002. The codepoints which are mapped to something else are the following: " " (U+20): No pa
 th but full advance; "p" (U+70): Path has 0 ascent but full descent; "\xC9" (U+C9): Path has 0 descent but full ascent; Non-breaking space (U+A0): No path b
 ut full advance; Zero-width non-breaking space (U+FEFF): No path and 0 advance; En space (U+2002): No path and half advance; Em space (U+2003): No path but full advance; Three-per-em space (U+2004): No path and one third advance; Four-per-em space (U+2005): No path and one quarter advance; Six-per-em space (U+2006): No path and one
  sixth advance; Thin space (U+2009): No path and one fifth advance; Hair space (U+200A): No path and one tenth advance; Zero width space (U+200B): No path and no adva
 nce; Ideographic space (U+3000): No path but full advance; Zero width non-joiner (U+200C): No path and no advance; Zero width joiner (U+200D): No path and no advance; Greek capital letter Chi (U+3A7): Thin horizontal stripe and full advance; (U+6A2A): Thin horizontal stripe and full advance; Greek capital letter Upsilon (U+3A5): T
 hin vertical stripe and full advance; (U+7EB5): Thin vertical stripe and full advance.http://www.w3c.orghttp://dev.w3.org/CSS/fonts/ahem/COPYING
+AhemRegularAhem\xFF{	+ !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x80\x81\x83\x84\x85\x86\x88\x89\x8A\x8B\x8D\x8E\x90\x91\x93\x96\x97\x9D\x9E\xA0\xA1\xA2\xA3\xA4\xA9\xAA\xAC\xAD\xAE\xAF\xB6\xB7\xB8\xBA\xBD\xC3\xC7\xC8\xC9\xCA\xCB\xCC\xCD\xCE\xCF\xD0\xD1\xD3\xD4\xD5\xD6\xD7\xD8\xD9\xDA\xDB\xDC\xDD\xDE\xDF\xE0\xE1\xE8\xE9\xEA\xEB\xEC\xED\xEE\xEF\xF0\xF1\xF2\xF3\xF4\xF5\xF6\xB0\xB1\xBB\x
 A6\xA8\x9F\x9B\xB2\xB3\xC4\xB4\xB5\xC5\x82\xC2\x87\xAB\xC6\xBE\xBF\xBC\x8C\x98\x9A\x99\xA5\x92\x9C\x8F\x94\x95\xA7\xB9\xD2\xC0\xC1	
++ !"#$%&'()NULLglyph243glyph204glyph205HTDELuniFEFFuni2002uni2003uni2004uni2005uni2006uni2009uni200Auni200Buni3000	afii61664afii301uni4E00uni4E8Cuni4E09uni56DBuni4E94uni516Duni4E03uni516Buni4E5Duni5341uni3007uni56D7uni706Buni6C34uni6728uni91D1uni571Funi03A7uni6A2Auni03A5uni7EB5myles
\ No newline at end of file

Modified: trunk/Source/WebCore/ChangeLog (292521 => 292522)


--- trunk/Source/WebCore/ChangeLog	2022-04-07 02:18:01 UTC (rev 292521)
+++ trunk/Source/WebCore/ChangeLog	2022-04-07 02:44:11 UTC (rev 292522)
@@ -1,3 +1,28 @@
+2022-04-06  Myles C. Maxfield  <mmaxfi...@apple.com>
+
+        NBSP characters drawn in fonts that don't support the space character turn into boxes
+        https://bugs.webkit.org/show_bug.cgi?id=238836
+        <rdar://problem/91130503>
+
+        Reviewed by Alan Bujtas.
+
+        We have some historical code in WebKit where we swap out the non-breaking space glyph
+        for the space glyphs when rendering. This is not what the other browsers do; they will
+        faithfully render the non-breaking space glyph. This patch aligns with the other
+        browsers.
+
+        This patch also fixes a similar problem with tab characters. Other browsers never
+        render any visible tab glyphs, even if the font has a visible glyph for the tab
+        character. This patch implements this.
+
+        This patch also only clobbers the glyphs used for carriageReturn and newlineCharacter
+        if the replacement glyph exists.
+
+        Test: fast/text/nbsp-no-space.html
+
+        * platform/graphics/WidthIterator.cpp:
+        (WebCore::WidthIterator::applyCSSVisibilityRules):
+
 2022-04-06  Andres Gonzalez  <andresg...@apple.com>
 
         [ Mac ] accessibility/mac/expanded-notification.html is a flaky text failure

Modified: trunk/Source/WebCore/platform/graphics/GlyphBuffer.h (292521 => 292522)


--- trunk/Source/WebCore/platform/graphics/GlyphBuffer.h	2022-04-07 02:18:01 UTC (rev 292521)
+++ trunk/Source/WebCore/platform/graphics/GlyphBuffer.h	2022-04-07 02:44:11 UTC (rev 292522)
@@ -119,10 +119,15 @@
 
     void deleteGlyphWithoutAffectingSize(unsigned index)
     {
+        makeGlyphInvisible(index);
+        m_advances[index] = makeGlyphBufferAdvance();
+    }
+
+    void makeGlyphInvisible(unsigned index)
+    {
         // GlyphID 0xFFFF is the "deleted glyph" and is supposed to be invisible when rendered.
         static const constexpr GlyphBufferGlyph deletedGlyph = 0xFFFF;
         m_glyphs[index] = deletedGlyph;
-        m_advances[index] = makeGlyphBufferAdvance();
     }
 
     void makeHole(unsigned location, unsigned length, const Font* font)

Modified: trunk/Source/WebCore/platform/graphics/WidthIterator.cpp (292521 => 292522)


--- trunk/Source/WebCore/platform/graphics/WidthIterator.cpp	2022-04-07 02:18:01 UTC (rev 292521)
+++ trunk/Source/WebCore/platform/graphics/WidthIterator.cpp	2022-04-07 02:44:11 UTC (rev 292522)
@@ -558,7 +558,7 @@
 
     float yPosition = height(glyphBuffer.initialAdvance());
 
-    auto adjustForSyntheticBold = [&] (auto index) {
+    auto adjustForSyntheticBold = [&](auto index) {
         auto glyph = glyphBuffer.glyphAt(index);
         static constexpr const GlyphBufferGlyph deletedGlyph = 0xFFFF;
         auto syntheticBoldOffset = glyph == deletedGlyph ? 0 : glyphBuffer.fontAt(index).syntheticBoldOffset();
@@ -567,7 +567,7 @@
         setWidth(advance, width(advance) + syntheticBoldOffset);
     };
 
-    auto clobberGlyph = [&] (auto index, auto newGlyph) {
+    auto clobberGlyph = [&](auto index, auto newGlyph) {
         glyphBuffer.glyphs(index)[0] = newGlyph;
     };
 
@@ -575,7 +575,7 @@
     // applied. If the last glyph in a run needs to have its advance clobbered, but the next run has an initial advance, we need
     // to apply the initial advance on the new clobbered advance, rather than clobbering the initial advance entirely.
 
-    auto clobberAdvance = [&] (auto index, auto newAdvance) {
+    auto clobberAdvance = [&](auto index, auto newAdvance) {
         auto advanceBeforeClobbering = glyphBuffer.advanceAt(index);
         glyphBuffer.advances(index)[0] = makeGlyphBufferAdvance(newAdvance, height(advanceBeforeClobbering));
         m_runWidthSoFar += width(glyphBuffer.advanceAt(index)) - width(advanceBeforeClobbering);
@@ -582,11 +582,15 @@
         glyphBuffer.origins(index)[0] = makeGlyphBufferOrigin(0, -yPosition);
     };
 
-    auto deleteGlyph = [&] (auto index) {
+    auto deleteGlyph = [&](auto index) {
         m_runWidthSoFar -= width(glyphBuffer.advanceAt(index));
         glyphBuffer.deleteGlyphWithoutAffectingSize(index);
     };
 
+    auto makeGlyphInvisible = [&](auto index) {
+        glyphBuffer.makeGlyphInvisible(index);
+    };
+
     for (unsigned i = glyphBufferStartIndex; i < glyphBuffer.size(); yPosition += height(glyphBuffer.advanceAt(i)), ++i) {
         auto stringOffset = glyphBuffer.checkedStringOffsetAt(i, m_run.length());
         if (!stringOffset)
@@ -596,11 +600,18 @@
         switch (characterResponsibleForThisGlyph) {
         case newlineCharacter:
         case carriageReturn:
+            ASSERT(glyphBuffer.fonts(i)[0]);
+            // FIXME: It isn't quite right to use the space glyph here, because the space character may be supposed to render with a totally unrelated font (because of fallback).
+            // Instead, we should probably somehow have the caller pass in a Font/glyph pair to use in this situation.
+            if (auto spaceGlyph = glyphBuffer.fontAt(i).spaceGlyph())
+                clobberGlyph(i, spaceGlyph);
+            adjustForSyntheticBold(i);
+            continue;
         case noBreakSpace:
+            adjustForSyntheticBold(i);
+            continue;
         case tabCharacter:
-            ASSERT(glyphBuffer.fonts(i)[0]);
-            // FIXME: Is this actually necessary? If the font specifically has a glyph for NBSP, I don't see a reason not to use it.
-            clobberGlyph(i, glyphBuffer.fontAt(i).spaceGlyph());
+            makeGlyphInvisible(i);
             adjustForSyntheticBold(i);
             continue;
         }

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