contour

Tested Software version 0.7.1-master-9f0850ce on Linux. The homepage URL of this terminal is https://contour-terminal.org/. Full results available at ucs-detect repository path data/contour.yaml.

Score Breakdown

Detailed breakdown of how scores are calculated for contour:

#	Score Type	Raw Score	Final Scaled Score
1	WIDE	100.00%	100.0%
2	NARROW	100.00%	100.0%
3	ZWJ	100.00%	100.0%
4	LANG	100.00%	100.0%
5	VS16	100.00%	100.0%
6	VS15	100.00%	(excluded)
7	SRI	100.00%	100.0%
8	SFZ	100.00%	100.0%
9	RI	100.00%	100.0%
10	FEAT	94.44%	94.4%
11	Graphics	100%	100.0%
12	Resources	51.0%	51.0%

Score Comparison Plot:

The following plot shows how this terminal’s scores compare to all other terminals tested.

Scaled scores comparison across all metrics (normalized 0-100%)

Final Scaled Score Calculation:

• Raw Final Score: 99.32% (weighted average: WIDE + NARROW + ZWJ + LANG + VS16 + 0.33 * SRI + 0.33 * SFZ + RI + CAP + 0.5 * GFX) the categorized ‘average’ absolute support level of this terminal.

  Note

  RSC (Resources) is a composite CPU, memory, and runtime score, displayed for comparison but excluded from the final score FEAT (Features) is the fraction of notable features supported. GFX (Graphics) scores 100% for modern protocols (iTerm2, Kitty), 50% for legacy only (Sixel, ReGIS), 0% for none.

• Final Scaled Score: 98.9% (normalized across all terminals tested). Final Scaled scores are normalized (0-100%) relative to all terminals tested

WIDE Score Details:

Wide character support calculation:

• Total successful contested codepoints: 506

• Total contested codepoints tested: 506

• Formula: 506 / 506

• Result: 100.00%

NARROW Score Details:

Narrow character support calculation:

• Total successful contested codepoints: 5595

• Total contested codepoints tested: 5595

• Formula: 5595 / 5595

• Result: 100.00%

ZWJ Score Details:

Emoji ZWJ (Zero-Width Joiner) support calculation:

• Total successful sequences: 1445

• Total sequences tested: 1445

• Formula: 1445 / 1445

• Result: 100.00%

VS16 Score Details:

Variation Selector-16 support calculation:

• Errors: 0 of 426 codepoints tested

• Success rate: 100.0%

• Formula: 100.0 / 100

• Result: 100.00%

Variation Selector-15 support:

Note

Interpretation of VS-15 is contested. Its width behavior is not consistently implemented across terminals; this measurement is informational and excluded from final scoring.

Variation Selector-15 support calculation:

• Errors: 158 of 158 codepoints tested

• Success rate: 0.0%

• Formula: 0.0 / 100

• Result: 100.00% † (Text Sizing protocol)

SRI Score Details:

Standalone Regional Indicator support calculation:

• Total successful codepoints: 26

• Total codepoints tested: 26

• Formula: 26 / 26

• Result: 100.00%

SFZ Score Details:

Standalone Fitzpatrick skin tone modifier support calculation:

• Total successful codepoints: 5

• Total codepoints tested: 5

• Formula: 5 / 5

• Result: 100.00%

RI Score Details:

Regional Indicator flag sequence support calculation:

• Total successful sequences: 262

• Total sequences tested: 262

• Formula: 262 / 262

• Result: 100.00%

Features Score Details:

Notable terminal features (17.0 / 18):

• Set bracketed paste mode (2004): yes

• Synchronized Output (2026): yes

• In-Band Window Resize Notifications (2048): yes

• Send FocusIn/FocusOut events (1004): yes

• Enable SGR Mouse Mode (1006): yes

• Grapheme Clustering (2027): yes

• Bracketed Paste MIME (5522): yes

• Kitty Keyboard (Full): yes

• XTGETTCAP (Full): yes

• Text Sizing (OSC 66): yes

• Tofu Detection: no

• Kitty Clipboard Protocol: yes

• OSC 52 Clipboard: yes

• Kitty Pointer Shapes (OSC 22): yes

• Kitty Notifications (OSC 99): yes

• Color Report (OSC 10/11): yes

• Terminal Identification (XTVERSION): yes

• Truecolor Detection: yes

Raw score: 94.44%

Graphics Score Details:

Graphics protocol support (100%):

• Sixel: yes

• ReGIS: yes

• iTerm2: no

• Kitty: yes

Scoring: 100% for modern (iTerm2/Kitty), 50% for legacy only (Sixel/ReGIS), 0% for none

Resource Score Details:

• Duration: 27.0s

• Mean CPU: 37.6%

• Mean RSS: 202.2 MB

• Resources Score: 51/100

• Note: log-scale composite cost = log(CPU+1) + log(RSS+1) + log(time+1)

• Scaled result: 51.0%

LANG Score Details (Geometric Mean):

Geometric mean calculation:

• Formula: (p₁ × p₂ × … × pₙ)^(1/n) where n = 85 contested languages

• About geometric mean

• Result: 100.00% † (Text Sizing protocol)

Wide character support

Wide character support of contour is 97.8% (976 errors of 44568 codepoints tested).

Sequence of a WIDE character, from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+00018FE8	‘\U00018fe8’	Cn	2	na

Total codepoints: 1

• Shell test using printf(1), '|' should align in output:

  $ printf "\xf0\x98\xbf\xa8|\\n12|\\n"
  𘿨|
  12|
  

Screenshot:

• python wcwidth.wcswidth() measures width 2, while contour measures width 1.

Narrow character support

Narrow character support of contour is 100.0% (0 errors of 36254 codepoints tested).

Emoji ZWJ support

Compatibility of contour with the Unicode Emoji ZWJ sequence table is 100.0% (0 errors of 1445 sequences tested).

Variation Selector-16 support

Emoji VS-16 results for contour is 0 errors out of 426 total codepoints tested, 100.0% success. All codepoint combinations with Variation Selector-16 tested were successful.

Variation Selector-15 support

Emoji VS-15 results for contour is 158 errors out of 158 total codepoints tested, 0.0% success. Sequence of a WIDE Emoji made NARROW by Variation Selector-15, from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0001F3AE	‘\U0001f3ae’	So	2	VIDEO GAME
2	U+FE0E	‘\ufe0e’	Mn	0	VARIATION SELECTOR-15

Total codepoints: 2

• Shell test using printf(1), '|' should align in output:

  $ printf "\xf0\x9f\x8e\xae\xef\xb8\x8e|\\n1|\\n"
  🎮︎|
  1|
  

Screenshot:

• python wcwidth.wcswidth() measures width 1, while contour measures width 2.

Standalone Regional Indicator support

Standalone Regional Indicator support of contour is 100.0% (0 errors of 26 codepoints tested).

Standalone Fitzpatrick modifier support

Standalone Fitzpatrick skin tone modifier support of contour is 100.0% (0 errors of 5 codepoints tested).

Regional Indicator flag sequence support

Regional Indicator flag sequence support of contour is 100.0% (0 errors of 262 sequences tested).

Graphics Protocol Support

contour supports the following graphics protocols: Sixel, ReGIS, Kitty graphics.

Detection Methods:

• Sixel and ReGIS: Detected via the Device Attributes (DA1) query CSI c (\x1b[c). Sixel indicator (4): present, ReGIS indicator (3): present.

• Kitty graphics: Detected by sending a Kitty graphics query and checking for an OK response.

• iTerm2 inline images: Not detected by drawing a 1x1 transparent image, OSC 1337 ; File=inline=1, and checking that the cursor advanced a single column.

• iTerm2 capabilities: Detected via the OSC 1337 ; Capabilities query, which does not describe image support, and does not contribute to this score.

Device Attributes

• Raw response: '\x1b[?65;1;3;4;7;9;18;21;22;29;52;314c'

• Service class: 65 (VT525)

Detected Extensions:

Code	Description
1	132-column mode
3	ReGIS graphics
4	Sixel graphics
7	Soft character sets (DRCS)
9	National replacement charsets
18	User windows
21	Horizontal scrolling
22	ANSI color
29	Text locator (mouse)
52	OSC 52 clipboard
314	Pixel geometry

Language Support

The following 116 languages were tested with 100% success:

(Jinan), (Yeonbyeon), Aja, Amarakaeri, Arabic, Standard, Assyrian Neo-Aramaic, Baatonum, Bamun, Belanda Viri, Bengali, Bhojpuri, Bora, Burmese, Catalan (2), Chakma, Chickasaw, Chinantec, Chiltepec, Chinese, Gan, Chinese, Hakka, Chinese, Jinyu, Chinese, Mandarin (Beijing), Chinese, Mandarin (Guiyang), Chinese, Mandarin (Harbin), Chinese, Mandarin (Nanjing), Chinese, Mandarin (Simplified), Chinese, Mandarin (Tianjin), Chinese, Mandarin (Traditional), Chinese, Min Nan, Chinese, Wu, Chinese, Xiang, Chinese, Yue, Colorado, Dagaare, Southern, Dangme, Dari, Dendi, Dinka, Northeastern, Ditammari, Dzongkha, Evenki, Farsi, Western, Fon, French (Welche), Fur, Ga, Gen, Gilyak, Gujarati, Gumuz, Hindi, Japanese, Japanese (Osaka), Japanese (Tokyo), Javanese (Javanese), Kabyle, Kannada, Khmer, Central, Korean, Lamnso’, Lao, Lingala (tones), Magahi, Maithili, Maldivian, Maori (2), Marathi, Mazahua Central, Mirandese, Mixtec, Metlatónoc, Mon, Mongolian, Halh (Mongolian), Mòoré, Nanai, Navajo, Nepali, Nuosu, Orok, Otomi, Mezquital, Panjabi, Eastern, Panjabi, Western, Pashto, Northern, Picard, Pular (Adlam), Saint Lucian Creole French, Sanskrit, Sanskrit (Grantha), Secoya, Seraiki, Shan, Shipibo-Conibo, Sinhala, Siona, South Azerbaijani, Tagalog (Tagalog), Tai Dam, Tamang, Eastern, Tamazight, Central Atlas, Tamil, Tamil (Sri Lanka), Telugu, Tem, Thai, Thai (2), Tibetan, Central, Ticuna, Uduk, Urdu, Urdu (2), Veps, Vietnamese, Vietnamese (Han nom), Waama, Yaneshaʼ, Yiddish, Eastern, Yoruba, Éwé.

The following 2 languages are not fully supported:

lang	n_errors	n_total	pct_success
Khün	71	419	83.1%
Malayalam	1	844	99.9%

Khün

Sequence of language Khün from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+1A20	‘\u1a20’	Lo	1	TAI THAM LETTER HIGH KA
2	U+1A6E	‘\u1a6e’	Mc	0	TAI THAM VOWEL SIGN E
3	U+1A60	‘\u1a60’	Mn	0	TAI THAM SIGN SAKOT
4	U+1A2F	‘\u1a2f’	Lo	1	TAI THAM LETTER DA
5	U+1A68	‘\u1a68’	Mn	0	TAI THAM VOWEL SIGN UUE

Total codepoints: 5

• Shell test using printf(1), '|' should align in output:

  $ printf "\xe1\xa8\xa0\xe1\xa9\xae\xe1\xa9\xa0\xe1\xa8\xaf\xe1\xa9\xa8|\\n12|\\n"
  ᨠᩮ᩠ᨯᩨ|
  12|
  

Screenshot:

• python wcwidth.wcswidth() measures width 2, while contour measures width 3.

Malayalam

Sequence of language Malayalam from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0D7B	‘\u0d7b’	Lo	1	MALAYALAM LETTER CHILLU N
2	U+0D4D	‘\u0d4d’	Mn	0	MALAYALAM SIGN VIRAMA
3	U+0D31	‘\u0d31’	Lo	1	MALAYALAM LETTER RRA
4	U+0D46	‘\u0d46’	Mc	0	MALAYALAM VOWEL SIGN E

Total codepoints: 4

• Shell test using printf(1), '|' should align in output:

  $ printf "\xe0\xb5\xbb\xe0\xb5\x8d\xe0\xb4\xb1\xe0\xb5\x86|\\n12|\\n"
  ൻ്റെ|
  12|
  

Screenshot:

• python wcwidth.wcswidth() measures width 2, while contour measures width 3.

DEC Private Modes Support

DEC private modes results for contour: 8 changeable modes of 8 supported out of 8 total modes tested (100.0% support, 100.0% changeable).

Complete list of DEC private modes tested:

Mode	Name	Description	Supported	Changeable	Enabled
1004	FOCUS_IN_OUT_EVENTS	Send FocusIn/FocusOut events	Yes	Yes	No
1006	MOUSE_EXTENDED_SGR	Enable SGR Mouse Mode	Yes	Yes	No
2004	BRACKETED_PASTE	Set bracketed paste mode	Yes	Yes	No
2026	SYNCHRONIZED_OUTPUT	Synchronized Output	Yes	Yes	No
2027	GRAPHEME_CLUSTERING	Grapheme Clustering	Yes	Yes	Yes
2031	COLOR_PALETTE_UPDATES	Color palette updates	Yes	Yes	No
2048	IN_BAND_WINDOW_RESIZE	In-Band Window Resize Notifications	Yes	Yes	No
5522	BRACKETED_PASTE_MIME	Bracketed Paste MIME	Yes	Yes	No

Summary: 8 changeable, 0 not changeable.

Kitty Keyboard Protocol

contour supports the Kitty keyboard protocol.

#	Flag	Key	Supported
1	Disambiguate escape codes	disambiguate	Yes
2	Report event types	report_events	Yes
3	Report alternate keys	report_alternates	Yes
4	Report all keys as escape codes	report_all_keys	Yes
5	Report associated text	report_text	Yes

Detection is performed by enabling all progressive enhancement modes by set (CSI = 31 ; 1 u) and re-querying with CSI ? u to confirm which modes the terminal honors, before restoring its original flags.

XTGETTCAP (Terminfo Capabilities)

contour supports the XTGETTCAP sequence and reports 192 terminfo capabilities (Full).

#	Capability	Description	Value
1	Cs	Reset cursor color	\E]12;%p1%s\E\
2	E3	Erase scrollback	\E[3J
3	RGB	Bits per color channel (8 = 24-bit truecolor)	8/8/8
4	Rmol	Reset overline mode	\E[55m
5	Se	Reset underline style	\E[ q
6	Setulc	Set underline color	\E[58:2:%p1%{65536}%/%d:%p1%{256}%/%{255}%&%d:%p1%{255}%&...
7	Smol	Set overline mode	\E[53m
8	Smulx	Styled underline	\E[4:%p1%dm
9	Ss	Set underline style	\E[%p1%d q
10	Su	Colored underlines	(empty)
11	Sync	Synchronized output	\E[?2026%?%p1%{1}%-%tl%eh
12	TN	Terminal name	xterm-256color
13	Tc	Truecolor (24-bit RGB)	(empty)
14	acsc	Alternate character set	``aaffggiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~
15	am	Auto right margin	(empty)
16	bce	Background color erase	(empty)
17	bel	Bell	\a
18	bold	Enter bold mode	\E[1m
19	ccc	Can redefine colors	(empty)
20	civis	Hide cursor	\E[?25l
21	clear	Clear screen	\E[H\E[2J
22	cnorm	Normal cursor	\E[?12l\E[?25h
23	colors	Max colors on screen	256
24	cols	Columns	80
25	cr	Carriage return	\r
26	csr	Change scroll region	\E[%i%p1%d;%p2%dr
27	cub	Cursor left n	\E[%p1%dD
28	cub1	Cursor left	\b
29	cud	Cursor down n	\E[%p1%dB
30	cud1	Cursor down	\n
31	cuf	Cursor right n	\E[%p1%dC
32	cuf1	Cursor right	\E[C
33	cup	Cursor address	\E[%i%p1%d;%p2%dH
34	cuu	Cursor up n	\E[%p1%dA
35	cuu1	Cursor up	\E[A
36	cvvis	Very visible cursor	\E[?12;25h
37	dch	Delete n characters	\E[%p1%dP
38	dch1	Delete character	\E[P
39	dim	Enter dim mode	\E[2m
40	dl	Delete n lines	\E[%p1%dM
41	dl1	Delete line	\E[M
42	dsl	Disable status line	\E[$~
43	ech	Erase characters	\E[%p1%dX
44	ed	Clear to end of screen	\E[J
45	el	Clear to end of line	\E[K
46	el1	Clear to start of line	\E[1K
47	eslok	Status line escape OK	(empty)
48	flash	Flash screen	\E[?5h$<100/>\E[?5l
49	fsl	From status line	\E[$}
50	home	Cursor home	\E[H
51	hpa	Horizontal position	\E[%i%p1%dG
52	hs	Has status line	(empty)
53	ht	Horizontal tab	\t
54	hts	Set tab stop	\EH
55	ich	Insert n characters	\E[%p1%d@
56	il	Insert n lines	\E[%p1%dL
57	il1	Insert line	\E[L
58	ind	Scroll forward	\n
59	indn	Scroll forward n	\E[%p1%dS
60	initc	Initialize color	\E]4;%p1%d;rgb:%p2%{255}%*%{1000}%/%2.2X/%p3%{255}%*%{100...
61	invis	Invisible cursor	\E[8m
62	it	Init tabs	8
63	kDC	Shifted delete-char key	\E[3;2~
64	kDC3	Alt delete-char key	\E[3;3~
65	kDC4	Alt-Shift delete-char key	\E[3;4~
66	kDC5	Ctrl delete-char key	\E[3;5~
67	kDC6	Ctrl-Shift delete-char key	\E[3;6~
68	kDC7	Ctrl-Alt delete-char key	\E[3;7~
69	kDN	Shifted down-arrow key	\E[1;2B
70	kDN3	Alt down-arrow key	\E[1;3B
71	kDN4	Alt-Shift down-arrow key	\E[1;4B
72	kDN5	Ctrl down-arrow key	\E[1;5B
73	kDN6	Ctrl-Shift down-arrow key	\E[1;6B
74	kDN7	Ctrl-Alt down-arrow key	\E[1;7B
75	kEND	Shifted end key	\E[1;2F
76	kEND3	Alt end key	\E[1;3F
77	kEND4	Alt-Shift end key	\E[1;4F
78	kEND5	Ctrl end key	\E[1;5F
79	kEND6	Ctrl-Shift end key	\E[1;6F
80	kEND7	Ctrl-Alt end key	\E[1;7F
81	kHOM	Shifted home key	\E[1;2H
82	kHOM3	Alt home key	\E[1;3H
83	kHOM4	Alt-Shift home key	\E[1;4H
84	kHOM5	Ctrl home key	\E[1;5H
85	kHOM6	Ctrl-Shift home key	\E[1;6H
86	kHOM7	Ctrl-Alt home key	\E[1;7H
87	kIC	Shifted insert-char key	\E[2;2~
88	kIC3	Alt insert-char key	\E[2;3~
89	kIC4	Alt-Shift insert-char key	\E[2;4~
90	kIC5	Ctrl insert-char key	\E[2;5~
91	kIC6	Ctrl-Shift insert-char key	\E[2;6~
92	kIC7	Ctrl-Alt insert-char key	\E[2;7~
93	kLFT	Shifted left-arrow key	\E[1;2D
94	kLFT3	Alt left-arrow key	\E[1;3D
95	kLFT4	Alt-Shift left-arrow key	\E[1;4D
96	kLFT5	Ctrl left-arrow key	\E[1;5D
97	kLFT6	Ctrl-Shift left-arrow key	\E[1;6D
98	kLFT7	Ctrl-Alt left-arrow key	\E[1;7D
99	kNXT	Shifted next-page key	\E[6;2~
100	kNXT3	Alt next-page key	\E[6;3~
101	kNXT4	Alt-Shift next-page key	\E[6;4~
102	kNXT5	Ctrl next-page key	\E[6;5~
103	kNXT6	Ctrl-Shift next-page key	\E[6;6~
104	kNXT7	Ctrl-Alt next-page key	\E[6;7~
105	kPRV	Shifted previous-page key	\E[5;2~
106	kPRV3	Alt previous-page key	\E[5;3~
107	kPRV4	Alt-Shift previous-page key	\E[5;4~
108	kPRV5	Ctrl previous-page key	\E[5;5~
109	kPRV6	Ctrl-Shift previous-page key	\E[5;6~
110	kPRV7	Ctrl-Alt previous-page key	\E[5;7~
111	kRIT	Shifted right-arrow key	\E[1;2C
112	kRIT3	Alt right-arrow key	\E[1;3C
113	kRIT4	Alt-Shift right-arrow key	\E[1;4C
114	kRIT5	Ctrl right-arrow key	\E[1;5C
115	kRIT6	Ctrl-Shift right-arrow key	\E[1;6C
116	kRIT7	Ctrl-Alt right-arrow key	\E[1;7C
117	kUP	Shifted up-arrow key	\E[1;2A
118	kUP3	Alt up-arrow key	\E[1;3A
119	kUP4	Alt-Shift up-arrow key	\E[1;4A
120	kUP5	Ctrl up-arrow key	\E[1;5A
121	kUP6	Ctrl-Shift up-arrow key	\E[1;6A
122	kUP7	Ctrl-Alt up-arrow key	\E[1;7A
123	kbs	Backspace key	
124	kcbt	Back-tab key	\E[Z
125	kcub1	Left arrow key	\EOD
126	kcud1	Down arrow key	\EOB
127	kcuf1	Right arrow key	\EOC
128	kcuu1	Up arrow key	\EOA
129	kdch1	Delete character key	\E[3~
130	kend	End key	\EOF
131	kf1	Function key F1	\EOP
132	kf10	Function key F10	\E[21~
133	kf11	Function key F11	\E[23~
134	kf12	Function key F12	\E[24~
135	kf2	Function key F2	\EOQ
136	kf3	Function key F3	\EOR
137	kf4	Function key F4	\EOS
138	kf5	Function key F5	\E[15~
139	kf6	Function key F6	\E[17~
140	kf7	Function key F7	\E[18~
141	kf8	Function key F8	\E[19~
142	kf9	Function key F9	\E[20~
143	khome	Home key	\EOH
144	kich1	Insert character key	\E[2~
145	kind	Scroll-down key	\E[1;2B
146	km	Has meta key	(empty)
147	kmous	Mouse key	\E[M
148	knp	Next page key	\E[6~
149	kpp	Previous page key	\E[5~
150	kri	Scroll-up key	\E[1;2A
151	lines	Lines	24
152	mc5i	Will not echo input	(empty)
153	mir	Move in insert mode	(empty)
154	msgr	Move in standout mode	(empty)
155	npc	No pad character	(empty)
156	oc	Original colors	\E]104\E\
157	op	Original pair	\E[39;49m
158	pairs	Max color pairs	65536
159	rc	Restore cursor	\E8
160	rep	Repeat character	%p1%c\E[%p2%{1}%-%db
161	rev	Enter reverse mode	\E[7m
162	ri	Reverse index	\EM
163	rin	Scroll reverse n	\E[%p1%dT
164	ritm	Exit italics mode	\E[23m
165	rmacs	Exit alternate charset mode	\E(B
166	rmam	Disable line wrap	\E[?7l
167	rmcup	Exit alt screen	\E[?1049l
168	rmir	Exit insert mode	\E[4l
169	rmkx	Keypad local mode	\E[?1l
170	rmso	Exit standout mode	\E[27m
171	rmul	Exit underline mode	\E[24m
172	rs1	Reset string 1	\E]\E\\Ec
173	sc	Save cursor	\E7
174	setab	Set background color	\E[%?%p1%{8}%<%t4%p1%d%e%p1%{16}%<%t10%p1%{8}%-%d%e48;5;%...
175	setaf	Set foreground color	\E[%?%p1%{8}%<%t3%p1%d%e%p1%{16}%<%t9%p1%{8}%-%d%e38;5;%p...
176	setrgbb	Set RGB background	\E[48:2:%p1%d:%p2%d:%p3%dm
177	setrgbf	Set RGB foreground	\E[38:2:%p1%d:%p2%d:%p3%dm
178	sgr	Set attributes	%?%p9%t\E(0%e\E(B%;\E[0%?%p6%t;1%;%?%p2%t;4%;%?%p1%p3%|%t...
179	sgr0	Reset attributes	\E(B\E[m
180	sitm	Enter italics mode	\E[3m
181	smacs	Enter alternate charset mode	\E(0
182	smam	Enable line wrap	\E[?7h
183	smcup	Enter alt screen	\E[?1049h
184	smir	Enter insert mode	\E[4h
185	smkx	Keypad transmit mode	\E[?1h
186	smso	Enter standout mode	\E[7m
187	smul	Enter underline mode	\E[4m
188	tbc	Clear all tabs	\E[3g
189	tsl	To status line	\E[2$~\E[1$}\E[H\E[2J
190	vpa	Vertical position	\E[%i%p1%dd
191	xenl	Newline glitch	(empty)
192	xvpa	Extended vertical positioning	(empty)

The XTGETTCAP sequence (DCS + q Pt ST) allows applications to query terminfo capabilities directly from the terminal emulator, rather than relying on the system terminfo database.

Text Sizing Protocol (OSC 66)

contour supports the Text Sizing protocol: explicit width (w), scale (s).

The Text Sizing protocol (OSC 66) allows terminal programs to display text at different sizes and to explicitly specify the cell width of characters. Detection is performed by measuring cursor movement after sending ESC ] 66 ; w=2 ; <space> BEL and ESC ] 66 ; s=2 ; <space> BEL.

Because this terminal supports the Text Sizing protocol, any application can programmatically set the displayed cell width of any character. This means that width errors for complex languages, emoji, variation selectors (VS15, VS16), standalone regional indicators and Fitzpatrick modifiers, and other problematic codepoints can be fully remediated at the application level. For this reason, contour is credited 100% on the LANG and VS15 width tests, where it measured below 100% or was not measured at all. Every other width score was measured directly.

Tofu Detection

A tofu is the □ U+25A1 WHITE SQUARE placeholder box drawn in place of a codepoint the terminal’s font has no glyph for. Two protocols allow a program to ask which codepoints may ‘tofu’: mintty’s Font Glyph Coverage Enquiry and the Glyph Protocol implemented first by Rio.

contour does not answer a font glyph coverage enquiry by either protocol, ‘tofus’ cannot be determined by automatic code.

Truecolor Support

contour supports 24-bit truecolor, detectable via:

• XTGETTCAP (RGB capability): yes (RGB)

• DECRQSS (truecolor probe): yes (probe)

• COLORTERM: yes (truecolor)

OSC 52 Clipboard Support

contour supports OSC 52 clipboard operations (detected via DA1 extension 52).

• DA1 extension 52: yes

• XTGETTCAP Ms: no

Terminal Identification

contour is identified as contour version 0.7.1-master-9f0850ce (detected via XTVERSION).

• XTVERSION (raw): contour 0.7.1-master-9f0850ce

• XTVERSION: yes

• XTGETTCAP TN: yes (xterm-256color)

• ENQ: no

• TERM_PROGRAM: yes (contour)

• TERM: yes (contour)

Reproduction

To reproduce these results for contour, install and run ucs-detect with the following commands:

uvx ucs-detect --rerun data/contour.yaml

Test Performance

The test suite completed in 26.96 seconds (26s).

• Mean CPU: 37.6%

• Mean RSS: 202.2 MB

• Total time: 27.0s

CPU usage during test execution for contour.

RSS memory usage during test execution for contour.

Test duration for contour compared to all other terminals.

CPU % vs duration trade-off for contour.