IBM Plex Sans Thai Looped: Version 1.1 added #3558
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* IBM Plex Sans Thai Looped Version 1.1 taken from the upstream repo https://github.com/googlefonts/plex at commit googlefonts/plex@20f9338.
Fontbakery reportFontbakery version: 0.7.37 [3] Family checks🔥 FAIL: Fonts have consistent underline thickness?--- Rationale --- Dave C Lemon (Adobe Type Team) recommends setting the underline thickness to be consistent across the family. If thicknesses are not family consistent, words set on the same line which have different styles look strange. See also: https://twitter.com/typenerd1/status/690361887926697986
⚠ WARN: Is the command `ftxvalidator` (Apple Font Tool Suite) available?--- Rationale --- There's no reasonable (and legal) way to run the command `ftxvalidator` of the Apple Font Tool Suite on a non-macOS machine. I.e. on GNU+Linux or Windows etc. If Font Bakery is not running on an OSX machine, the machine running Font Bakery could access `ftxvalidator` on OSX, e.g. via ssh or a remote procedure call (rpc). There's an ssh example implementation at: https://github.com/googlefonts/fontbakery/blob/main/prebuilt/workarounds /ftxvalidator/ssh-implementation/ftxvalidator
⚠ WARN: Make sure all font files have the same version value.
[19] IBMPlexSansThaiLooped-Bold.ttf🔥 FAIL: Does DESCRIPTION file contain a upstream Git repo URL?--- Rationale --- The contents of the DESCRIPTION.en-us.html file are displayed on the Google Fonts website in the about section of each font family specimen page. Since all of the Google Fonts collection is composed of libre-licensed fonts, this check enforces a policy that there must be a hypertext link in that page directing users to the repository where the font project files are made available. Such hosting is typically done on sites like Github, Gitlab, GNU Savannah or any other git-based version control service.
🔥 FAIL: Substitute copyright, registered and trademark symbols in name table entries.
🔥 FAIL: Check license file has good copyright string.--- Rationale --- An OFL.txt file's first line should be the font copyright e.g: "Copyright 2019 The Montserrat Project Authors (https://github.com/julietaula/montserrat)"
🔥 FAIL: Copyright notices match canonical pattern in METADATA.pb--- Rationale --- The expected pattern for the copyright string adheres to the following rules: * It must say "Copyright" followed by a 4 digit year (optionally followed by a hyphen and another 4 digit year) * Then it must say "The <familyname> Project Authors" * And within parentheses, a URL for a git repository must be provided * The check is case insensitive and does not validate whether the familyname is correct, even though we'd expect it is (and we may soon update the check to validate that aspect as well!) Here is an example of a valid copyright string: "Copyright 2017 The Archivo Black Project Authors (https://github.com/Omnibus-Type/ArchivoBlack)"
🔥 FAIL: Copyright notices match canonical pattern in fonts
🔥 FAIL: Font enables smart dropout control in "prep" table instructions?--- Rationale ---
This setup is meant to ensure consistent rendering quality for fonts across all
devices (with different rendering/hinting capabilities).
Below is the snippet of instructions we expect to see in the fonts:
B8 01 FF PUSHW 0x01FF
85 SCANCTRL (unconditinally turn on
dropout control mode)
B0 04 PUSHB 0x04
8D SCANTYPE (enable smart dropout control)
"Smart dropout control" means activating rules 1, 2 and 5:
Rule 1: If a pixel's center falls within the glyph outline,
that pixel is turned on.
Rule 2: If a contour falls exactly on a pixel's center,
that pixel is turned on.
Rule 5: If a scan line between two adjacent pixel centers
(either vertical or horizontal) is intersected
by both an on-Transition contour and an off-Transition
contour and neither of the pixels was already turned on
by rules 1 and 2, turn on the pixel which is closer to
the midpoint between the on-Transition contour and
off-Transition contour. This is "Smart" dropout control.
For more detailed info (such as other rules not enabled in this snippet), please
refer to the TrueType Instruction Set documentation.
🔥 FAIL: METADATA.pb: Designer is listed with the correct name on the Google Fonts catalog of designers?
🔥 FAIL: Checking font version fields (head and name table).
⚠ WARN: DESCRIPTION.en_us.html should end in a linebreak.--- Rationale --- Some older text-handling tools sometimes misbehave if the last line of data in a text file is not terminated with a newline character (also known as '\n'). We know that this is a very small detail, but for the sake of keeping all DESCRIPTION.en_us.html files uniformly formatted throughout the GFonts collection, we chose to adopt the practice of placing this final linebreak char on them.
⚠ WARN: Check copyright namerecords match license file.--- Rationale --- A known licensing description must be provided in the NameID 14 (LICENSE DESCRIPTION) entries of the name table. The source of truth for this check (to determine which license is in use) is a file placed side-by-side to your font project including the licensing terms. Depending on the chosen license, one of the following string snippets is expected to be found on the NameID 13 (LICENSE DESCRIPTION) entries of the name table: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: License URL matches License text on name table?--- Rationale --- A known license URL must be provided in the NameID 14 (LICENSE INFO URL) entry of the name table. The source of truth for this check is the licensing text found on the NameID 13 entry (LICENSE DESCRIPTION). The string snippets used for detecting licensing terms are: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: Is the Grid-fitting and Scan-conversion Procedure ('gasp') table set to optimize rendering?--- Rationale --- Traditionally version 0 'gasp' tables were set so that font sizes below 8 ppem had no grid fitting but did have antialiasing. From 9-16 ppem, just grid fitting. And fonts above 17ppem had both antialiasing and grid fitting toggled on. The use of accelerated graphics cards and higher resolution screens make this approach obsolete. Microsoft's DirectWrite pushed this even further with much improved rendering built into the OS and apps. In this scenario it makes sense to simply toggle all 4 flags ON for all font sizes.
⚠ WARN: METADATA.pb: Fontfamily is listed on Google Fonts API?
⚠ WARN: Check if each glyph has the recommended amount of contours.--- Rationale --- Visually QAing thousands of glyphs by hand is tiring. Most glyphs can only be constructured in a handful of ways. This means a glyph's contour count will only differ slightly amongst different fonts, e.g a 'g' could either be 2 or 3 contours, depending on whether its double story or single story. However, a quotedbl should have 2 contours, unless the font belongs to a display family. This check currently does not cover variable fonts because there's plenty of alternative ways of constructing glyphs with multiple outlines for each feature in a VarFont. The expected contour count data for this check is currently optimized for the typical construction of glyphs in static fonts.
The following glyphs do not have the recommended number of contours: Glyph name: uni0E12 Contours detected: 4 Expected: 1 or 3 ⚠ WARN: Are there caret positions declared for every ligature?--- Rationale --- All ligatures in a font must have corresponding caret (text cursor) positions defined in the GDEF table, otherwhise, users may experience issues with caret rendering. If using GlyphsApp or UFOs, ligature carets can be defined as anchors with names starting with 'caret_'. These can be compiled with fontmake as of version v2.4.0.
⚠ WARN: Is there kerning info for non-ligated sequences?--- Rationale --- Fonts with ligatures should have kerning on the corresponding non-ligated sequences for text where ligatures aren't used (eg https://github.com/impallari/Raleway/issues/14).
⚠ WARN: Combined length of family and style must not exceed 27 characters.--- Rationale --- According to a GlyphsApp tutorial [1], in order to make sure all versions of Windows recognize it as a valid font file, we must make sure that the concatenated length of the familyname (NameID.FONT_FAMILY_NAME) and style (NameID.FONT_SUBFAMILY_NAME) strings in the name table do not exceed 20 characters. After discussing the problem in more detail at `FontBakery issue #2179 [2] we decided that allowing up to 27 chars would still be on the safe side, though. [1] https://glyphsapp.com/tutorials/multiple-masters-part-3-setting-up-instances [2] https://github.com/googlefonts/fontbakery/issues/2179
Please take a look at the conversation at fonttools/fontbakery#2179 in order to understand the reasoning behind these name table records max-length criteria. [code: too-long] ⚠ WARN: Are there any misaligned on-curve points?
--- Rationale --- This check heuristically looks for on-curve points which are close to, but do not sit on, significant boundary coordinates. For example, a point which has a Y-coordinate of 1 or -1 might be a misplaced baseline point. As well as the baseline, here we also check for points near the x-height (but only for lower case Latin letters), cap-height, ascender and descender Y coordinates. Not all such misaligned curve points are a mistake, and sometimes the design may call for points in locations near the boundaries. As this check is liable to generate significant numbers of false positives, it will pass if there are more than 100 reported misalignments.
⚠ WARN: Do outlines contain any semi-vertical or semi-horizontal lines?
--- Rationale --- This check detects line segments which are nearly, but not quite, exactly horizontal or vertical. Sometimes such lines are created by design, but often they are indicative of a design error. This check is disabled for italic styles, which often contain nearly-upright lines.
[18] IBMPlexSansThaiLooped-ExtraLight.ttf🔥 FAIL: Does DESCRIPTION file contain a upstream Git repo URL?--- Rationale --- The contents of the DESCRIPTION.en-us.html file are displayed on the Google Fonts website in the about section of each font family specimen page. Since all of the Google Fonts collection is composed of libre-licensed fonts, this check enforces a policy that there must be a hypertext link in that page directing users to the repository where the font project files are made available. Such hosting is typically done on sites like Github, Gitlab, GNU Savannah or any other git-based version control service.
🔥 FAIL: Substitute copyright, registered and trademark symbols in name table entries.
🔥 FAIL: Check license file has good copyright string.--- Rationale --- An OFL.txt file's first line should be the font copyright e.g: "Copyright 2019 The Montserrat Project Authors (https://github.com/julietaula/montserrat)"
🔥 FAIL: Copyright notices match canonical pattern in METADATA.pb--- Rationale --- The expected pattern for the copyright string adheres to the following rules: * It must say "Copyright" followed by a 4 digit year (optionally followed by a hyphen and another 4 digit year) * Then it must say "The <familyname> Project Authors" * And within parentheses, a URL for a git repository must be provided * The check is case insensitive and does not validate whether the familyname is correct, even though we'd expect it is (and we may soon update the check to validate that aspect as well!) Here is an example of a valid copyright string: "Copyright 2017 The Archivo Black Project Authors (https://github.com/Omnibus-Type/ArchivoBlack)"
🔥 FAIL: Copyright notices match canonical pattern in fonts
🔥 FAIL: Font enables smart dropout control in "prep" table instructions?--- Rationale ---
This setup is meant to ensure consistent rendering quality for fonts across all
devices (with different rendering/hinting capabilities).
Below is the snippet of instructions we expect to see in the fonts:
B8 01 FF PUSHW 0x01FF
85 SCANCTRL (unconditinally turn on
dropout control mode)
B0 04 PUSHB 0x04
8D SCANTYPE (enable smart dropout control)
"Smart dropout control" means activating rules 1, 2 and 5:
Rule 1: If a pixel's center falls within the glyph outline,
that pixel is turned on.
Rule 2: If a contour falls exactly on a pixel's center,
that pixel is turned on.
Rule 5: If a scan line between two adjacent pixel centers
(either vertical or horizontal) is intersected
by both an on-Transition contour and an off-Transition
contour and neither of the pixels was already turned on
by rules 1 and 2, turn on the pixel which is closer to
the midpoint between the on-Transition contour and
off-Transition contour. This is "Smart" dropout control.
For more detailed info (such as other rules not enabled in this snippet), please
refer to the TrueType Instruction Set documentation.
🔥 FAIL: METADATA.pb: Designer is listed with the correct name on the Google Fonts catalog of designers?
⚠ WARN: DESCRIPTION.en_us.html should end in a linebreak.--- Rationale --- Some older text-handling tools sometimes misbehave if the last line of data in a text file is not terminated with a newline character (also known as '\n'). We know that this is a very small detail, but for the sake of keeping all DESCRIPTION.en_us.html files uniformly formatted throughout the GFonts collection, we chose to adopt the practice of placing this final linebreak char on them.
⚠ WARN: Check copyright namerecords match license file.--- Rationale --- A known licensing description must be provided in the NameID 14 (LICENSE DESCRIPTION) entries of the name table. The source of truth for this check (to determine which license is in use) is a file placed side-by-side to your font project including the licensing terms. Depending on the chosen license, one of the following string snippets is expected to be found on the NameID 13 (LICENSE DESCRIPTION) entries of the name table: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: License URL matches License text on name table?--- Rationale --- A known license URL must be provided in the NameID 14 (LICENSE INFO URL) entry of the name table. The source of truth for this check is the licensing text found on the NameID 13 entry (LICENSE DESCRIPTION). The string snippets used for detecting licensing terms are: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: Is the Grid-fitting and Scan-conversion Procedure ('gasp') table set to optimize rendering?--- Rationale --- Traditionally version 0 'gasp' tables were set so that font sizes below 8 ppem had no grid fitting but did have antialiasing. From 9-16 ppem, just grid fitting. And fonts above 17ppem had both antialiasing and grid fitting toggled on. The use of accelerated graphics cards and higher resolution screens make this approach obsolete. Microsoft's DirectWrite pushed this even further with much improved rendering built into the OS and apps. In this scenario it makes sense to simply toggle all 4 flags ON for all font sizes.
⚠ WARN: METADATA.pb: Fontfamily is listed on Google Fonts API?
⚠ WARN: Check if each glyph has the recommended amount of contours.--- Rationale --- Visually QAing thousands of glyphs by hand is tiring. Most glyphs can only be constructured in a handful of ways. This means a glyph's contour count will only differ slightly amongst different fonts, e.g a 'g' could either be 2 or 3 contours, depending on whether its double story or single story. However, a quotedbl should have 2 contours, unless the font belongs to a display family. This check currently does not cover variable fonts because there's plenty of alternative ways of constructing glyphs with multiple outlines for each feature in a VarFont. The expected contour count data for this check is currently optimized for the typical construction of glyphs in static fonts.
The following glyphs do not have the recommended number of contours: Glyph name: uni0E2C Contours detected: 2 Expected: 1 or 3 ⚠ WARN: Are there caret positions declared for every ligature?--- Rationale --- All ligatures in a font must have corresponding caret (text cursor) positions defined in the GDEF table, otherwhise, users may experience issues with caret rendering. If using GlyphsApp or UFOs, ligature carets can be defined as anchors with names starting with 'caret_'. These can be compiled with fontmake as of version v2.4.0.
⚠ WARN: Is there kerning info for non-ligated sequences?--- Rationale --- Fonts with ligatures should have kerning on the corresponding non-ligated sequences for text where ligatures aren't used (eg https://github.com/impallari/Raleway/issues/14).
⚠ WARN: Combined length of family and style must not exceed 27 characters.--- Rationale --- According to a GlyphsApp tutorial [1], in order to make sure all versions of Windows recognize it as a valid font file, we must make sure that the concatenated length of the familyname (NameID.FONT_FAMILY_NAME) and style (NameID.FONT_SUBFAMILY_NAME) strings in the name table do not exceed 20 characters. After discussing the problem in more detail at `FontBakery issue #2179 [2] we decided that allowing up to 27 chars would still be on the safe side, though. [1] https://glyphsapp.com/tutorials/multiple-masters-part-3-setting-up-instances [2] https://github.com/googlefonts/fontbakery/issues/2179
Please take a look at the conversation at fonttools/fontbakery#2179 in order to understand the reasoning behind these name table records max-length criteria. [code: too-long] ⚠ WARN: Do outlines contain any jaggy segments?
--- Rationale --- This check heuristically detects outline segments which form a particularly small angle, indicative of an outline error. This may cause false positives in cases such as extreme ink traps, so should be regarded as advisory and backed up by manual inspection.
⚠ WARN: Do outlines contain any semi-vertical or semi-horizontal lines?
--- Rationale --- This check detects line segments which are nearly, but not quite, exactly horizontal or vertical. Sometimes such lines are created by design, but often they are indicative of a design error. This check is disabled for italic styles, which often contain nearly-upright lines.
[18] IBMPlexSansThaiLooped-Light.ttf🔥 FAIL: Does DESCRIPTION file contain a upstream Git repo URL?--- Rationale --- The contents of the DESCRIPTION.en-us.html file are displayed on the Google Fonts website in the about section of each font family specimen page. Since all of the Google Fonts collection is composed of libre-licensed fonts, this check enforces a policy that there must be a hypertext link in that page directing users to the repository where the font project files are made available. Such hosting is typically done on sites like Github, Gitlab, GNU Savannah or any other git-based version control service.
🔥 FAIL: Substitute copyright, registered and trademark symbols in name table entries.
🔥 FAIL: Check license file has good copyright string.--- Rationale --- An OFL.txt file's first line should be the font copyright e.g: "Copyright 2019 The Montserrat Project Authors (https://github.com/julietaula/montserrat)"
🔥 FAIL: Copyright notices match canonical pattern in METADATA.pb--- Rationale --- The expected pattern for the copyright string adheres to the following rules: * It must say "Copyright" followed by a 4 digit year (optionally followed by a hyphen and another 4 digit year) * Then it must say "The <familyname> Project Authors" * And within parentheses, a URL for a git repository must be provided * The check is case insensitive and does not validate whether the familyname is correct, even though we'd expect it is (and we may soon update the check to validate that aspect as well!) Here is an example of a valid copyright string: "Copyright 2017 The Archivo Black Project Authors (https://github.com/Omnibus-Type/ArchivoBlack)"
🔥 FAIL: Copyright notices match canonical pattern in fonts
🔥 FAIL: Font enables smart dropout control in "prep" table instructions?--- Rationale ---
This setup is meant to ensure consistent rendering quality for fonts across all
devices (with different rendering/hinting capabilities).
Below is the snippet of instructions we expect to see in the fonts:
B8 01 FF PUSHW 0x01FF
85 SCANCTRL (unconditinally turn on
dropout control mode)
B0 04 PUSHB 0x04
8D SCANTYPE (enable smart dropout control)
"Smart dropout control" means activating rules 1, 2 and 5:
Rule 1: If a pixel's center falls within the glyph outline,
that pixel is turned on.
Rule 2: If a contour falls exactly on a pixel's center,
that pixel is turned on.
Rule 5: If a scan line between two adjacent pixel centers
(either vertical or horizontal) is intersected
by both an on-Transition contour and an off-Transition
contour and neither of the pixels was already turned on
by rules 1 and 2, turn on the pixel which is closer to
the midpoint between the on-Transition contour and
off-Transition contour. This is "Smart" dropout control.
For more detailed info (such as other rules not enabled in this snippet), please
refer to the TrueType Instruction Set documentation.
🔥 FAIL: METADATA.pb: Designer is listed with the correct name on the Google Fonts catalog of designers?
🔥 FAIL: Checking font version fields (head and name table).
⚠ WARN: DESCRIPTION.en_us.html should end in a linebreak.--- Rationale --- Some older text-handling tools sometimes misbehave if the last line of data in a text file is not terminated with a newline character (also known as '\n'). We know that this is a very small detail, but for the sake of keeping all DESCRIPTION.en_us.html files uniformly formatted throughout the GFonts collection, we chose to adopt the practice of placing this final linebreak char on them.
⚠ WARN: Check copyright namerecords match license file.--- Rationale --- A known licensing description must be provided in the NameID 14 (LICENSE DESCRIPTION) entries of the name table. The source of truth for this check (to determine which license is in use) is a file placed side-by-side to your font project including the licensing terms. Depending on the chosen license, one of the following string snippets is expected to be found on the NameID 13 (LICENSE DESCRIPTION) entries of the name table: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: License URL matches License text on name table?--- Rationale --- A known license URL must be provided in the NameID 14 (LICENSE INFO URL) entry of the name table. The source of truth for this check is the licensing text found on the NameID 13 entry (LICENSE DESCRIPTION). The string snippets used for detecting licensing terms are: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: Is the Grid-fitting and Scan-conversion Procedure ('gasp') table set to optimize rendering?--- Rationale --- Traditionally version 0 'gasp' tables were set so that font sizes below 8 ppem had no grid fitting but did have antialiasing. From 9-16 ppem, just grid fitting. And fonts above 17ppem had both antialiasing and grid fitting toggled on. The use of accelerated graphics cards and higher resolution screens make this approach obsolete. Microsoft's DirectWrite pushed this even further with much improved rendering built into the OS and apps. In this scenario it makes sense to simply toggle all 4 flags ON for all font sizes.
⚠ WARN: METADATA.pb: Fontfamily is listed on Google Fonts API?
⚠ WARN: Check if each glyph has the recommended amount of contours.--- Rationale --- Visually QAing thousands of glyphs by hand is tiring. Most glyphs can only be constructured in a handful of ways. This means a glyph's contour count will only differ slightly amongst different fonts, e.g a 'g' could either be 2 or 3 contours, depending on whether its double story or single story. However, a quotedbl should have 2 contours, unless the font belongs to a display family. This check currently does not cover variable fonts because there's plenty of alternative ways of constructing glyphs with multiple outlines for each feature in a VarFont. The expected contour count data for this check is currently optimized for the typical construction of glyphs in static fonts.
The following glyphs do not have the recommended number of contours: Glyph name: uni0E2C Contours detected: 2 Expected: 1 or 3 ⚠ WARN: Are there caret positions declared for every ligature?--- Rationale --- All ligatures in a font must have corresponding caret (text cursor) positions defined in the GDEF table, otherwhise, users may experience issues with caret rendering. If using GlyphsApp or UFOs, ligature carets can be defined as anchors with names starting with 'caret_'. These can be compiled with fontmake as of version v2.4.0.
⚠ WARN: Is there kerning info for non-ligated sequences?--- Rationale --- Fonts with ligatures should have kerning on the corresponding non-ligated sequences for text where ligatures aren't used (eg https://github.com/impallari/Raleway/issues/14).
⚠ WARN: Combined length of family and style must not exceed 27 characters.--- Rationale --- According to a GlyphsApp tutorial [1], in order to make sure all versions of Windows recognize it as a valid font file, we must make sure that the concatenated length of the familyname (NameID.FONT_FAMILY_NAME) and style (NameID.FONT_SUBFAMILY_NAME) strings in the name table do not exceed 20 characters. After discussing the problem in more detail at `FontBakery issue #2179 [2] we decided that allowing up to 27 chars would still be on the safe side, though. [1] https://glyphsapp.com/tutorials/multiple-masters-part-3-setting-up-instances [2] https://github.com/googlefonts/fontbakery/issues/2179
Please take a look at the conversation at fonttools/fontbakery#2179 in order to understand the reasoning behind these name table records max-length criteria. [code: too-long] ⚠ WARN: Do outlines contain any jaggy segments?
--- Rationale --- This check heuristically detects outline segments which form a particularly small angle, indicative of an outline error. This may cause false positives in cases such as extreme ink traps, so should be regarded as advisory and backed up by manual inspection.
[19] IBMPlexSansThaiLooped-Medium.ttf🔥 FAIL: Does DESCRIPTION file contain a upstream Git repo URL?--- Rationale --- The contents of the DESCRIPTION.en-us.html file are displayed on the Google Fonts website in the about section of each font family specimen page. Since all of the Google Fonts collection is composed of libre-licensed fonts, this check enforces a policy that there must be a hypertext link in that page directing users to the repository where the font project files are made available. Such hosting is typically done on sites like Github, Gitlab, GNU Savannah or any other git-based version control service.
🔥 FAIL: Substitute copyright, registered and trademark symbols in name table entries.
🔥 FAIL: Check license file has good copyright string.--- Rationale --- An OFL.txt file's first line should be the font copyright e.g: "Copyright 2019 The Montserrat Project Authors (https://github.com/julietaula/montserrat)"
🔥 FAIL: Copyright notices match canonical pattern in METADATA.pb--- Rationale --- The expected pattern for the copyright string adheres to the following rules: * It must say "Copyright" followed by a 4 digit year (optionally followed by a hyphen and another 4 digit year) * Then it must say "The <familyname> Project Authors" * And within parentheses, a URL for a git repository must be provided * The check is case insensitive and does not validate whether the familyname is correct, even though we'd expect it is (and we may soon update the check to validate that aspect as well!) Here is an example of a valid copyright string: "Copyright 2017 The Archivo Black Project Authors (https://github.com/Omnibus-Type/ArchivoBlack)"
🔥 FAIL: Copyright notices match canonical pattern in fonts
🔥 FAIL: Font enables smart dropout control in "prep" table instructions?--- Rationale ---
This setup is meant to ensure consistent rendering quality for fonts across all
devices (with different rendering/hinting capabilities).
Below is the snippet of instructions we expect to see in the fonts:
B8 01 FF PUSHW 0x01FF
85 SCANCTRL (unconditinally turn on
dropout control mode)
B0 04 PUSHB 0x04
8D SCANTYPE (enable smart dropout control)
"Smart dropout control" means activating rules 1, 2 and 5:
Rule 1: If a pixel's center falls within the glyph outline,
that pixel is turned on.
Rule 2: If a contour falls exactly on a pixel's center,
that pixel is turned on.
Rule 5: If a scan line between two adjacent pixel centers
(either vertical or horizontal) is intersected
by both an on-Transition contour and an off-Transition
contour and neither of the pixels was already turned on
by rules 1 and 2, turn on the pixel which is closer to
the midpoint between the on-Transition contour and
off-Transition contour. This is "Smart" dropout control.
For more detailed info (such as other rules not enabled in this snippet), please
refer to the TrueType Instruction Set documentation.
🔥 FAIL: METADATA.pb: Designer is listed with the correct name on the Google Fonts catalog of designers?
🔥 FAIL: Checking font version fields (head and name table).
⚠ WARN: DESCRIPTION.en_us.html should end in a linebreak.--- Rationale --- Some older text-handling tools sometimes misbehave if the last line of data in a text file is not terminated with a newline character (also known as '\n'). We know that this is a very small detail, but for the sake of keeping all DESCRIPTION.en_us.html files uniformly formatted throughout the GFonts collection, we chose to adopt the practice of placing this final linebreak char on them.
⚠ WARN: Check copyright namerecords match license file.--- Rationale --- A known licensing description must be provided in the NameID 14 (LICENSE DESCRIPTION) entries of the name table. The source of truth for this check (to determine which license is in use) is a file placed side-by-side to your font project including the licensing terms. Depending on the chosen license, one of the following string snippets is expected to be found on the NameID 13 (LICENSE DESCRIPTION) entries of the name table: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: License URL matches License text on name table?--- Rationale --- A known license URL must be provided in the NameID 14 (LICENSE INFO URL) entry of the name table. The source of truth for this check is the licensing text found on the NameID 13 entry (LICENSE DESCRIPTION). The string snippets used for detecting licensing terms are: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: Is the Grid-fitting and Scan-conversion Procedure ('gasp') table set to optimize rendering?--- Rationale --- Traditionally version 0 'gasp' tables were set so that font sizes below 8 ppem had no grid fitting but did have antialiasing. From 9-16 ppem, just grid fitting. And fonts above 17ppem had both antialiasing and grid fitting toggled on. The use of accelerated graphics cards and higher resolution screens make this approach obsolete. Microsoft's DirectWrite pushed this even further with much improved rendering built into the OS and apps. In this scenario it makes sense to simply toggle all 4 flags ON for all font sizes.
⚠ WARN: METADATA.pb: Fontfamily is listed on Google Fonts API?
⚠ WARN: Check if each glyph has the recommended amount of contours.--- Rationale --- Visually QAing thousands of glyphs by hand is tiring. Most glyphs can only be constructured in a handful of ways. This means a glyph's contour count will only differ slightly amongst different fonts, e.g a 'g' could either be 2 or 3 contours, depending on whether its double story or single story. However, a quotedbl should have 2 contours, unless the font belongs to a display family. This check currently does not cover variable fonts because there's plenty of alternative ways of constructing glyphs with multiple outlines for each feature in a VarFont. The expected contour count data for this check is currently optimized for the typical construction of glyphs in static fonts.
The following glyphs do not have the recommended number of contours: Glyph name: uni0E2C Contours detected: 2 Expected: 1 or 3 ⚠ WARN: Are there caret positions declared for every ligature?--- Rationale --- All ligatures in a font must have corresponding caret (text cursor) positions defined in the GDEF table, otherwhise, users may experience issues with caret rendering. If using GlyphsApp or UFOs, ligature carets can be defined as anchors with names starting with 'caret_'. These can be compiled with fontmake as of version v2.4.0.
⚠ WARN: Is there kerning info for non-ligated sequences?--- Rationale --- Fonts with ligatures should have kerning on the corresponding non-ligated sequences for text where ligatures aren't used (eg https://github.com/impallari/Raleway/issues/14).
⚠ WARN: Combined length of family and style must not exceed 27 characters.--- Rationale --- According to a GlyphsApp tutorial [1], in order to make sure all versions of Windows recognize it as a valid font file, we must make sure that the concatenated length of the familyname (NameID.FONT_FAMILY_NAME) and style (NameID.FONT_SUBFAMILY_NAME) strings in the name table do not exceed 20 characters. After discussing the problem in more detail at `FontBakery issue #2179 [2] we decided that allowing up to 27 chars would still be on the safe side, though. [1] https://glyphsapp.com/tutorials/multiple-masters-part-3-setting-up-instances [2] https://github.com/googlefonts/fontbakery/issues/2179
Please take a look at the conversation at fonttools/fontbakery#2179 in order to understand the reasoning behind these name table records max-length criteria. [code: too-long] ⚠ WARN: Are there any misaligned on-curve points?
--- Rationale --- This check heuristically looks for on-curve points which are close to, but do not sit on, significant boundary coordinates. For example, a point which has a Y-coordinate of 1 or -1 might be a misplaced baseline point. As well as the baseline, here we also check for points near the x-height (but only for lower case Latin letters), cap-height, ascender and descender Y coordinates. Not all such misaligned curve points are a mistake, and sometimes the design may call for points in locations near the boundaries. As this check is liable to generate significant numbers of false positives, it will pass if there are more than 100 reported misalignments.
⚠ WARN: Do outlines contain any semi-vertical or semi-horizontal lines?
--- Rationale --- This check detects line segments which are nearly, but not quite, exactly horizontal or vertical. Sometimes such lines are created by design, but often they are indicative of a design error. This check is disabled for italic styles, which often contain nearly-upright lines.
[18] IBMPlexSansThaiLooped-Regular.ttf🔥 FAIL: Does DESCRIPTION file contain a upstream Git repo URL?--- Rationale --- The contents of the DESCRIPTION.en-us.html file are displayed on the Google Fonts website in the about section of each font family specimen page. Since all of the Google Fonts collection is composed of libre-licensed fonts, this check enforces a policy that there must be a hypertext link in that page directing users to the repository where the font project files are made available. Such hosting is typically done on sites like Github, Gitlab, GNU Savannah or any other git-based version control service.
🔥 FAIL: Substitute copyright, registered and trademark symbols in name table entries.
🔥 FAIL: Check license file has good copyright string.--- Rationale --- An OFL.txt file's first line should be the font copyright e.g: "Copyright 2019 The Montserrat Project Authors (https://github.com/julietaula/montserrat)"
🔥 FAIL: Copyright notices match canonical pattern in METADATA.pb--- Rationale --- The expected pattern for the copyright string adheres to the following rules: * It must say "Copyright" followed by a 4 digit year (optionally followed by a hyphen and another 4 digit year) * Then it must say "The <familyname> Project Authors" * And within parentheses, a URL for a git repository must be provided * The check is case insensitive and does not validate whether the familyname is correct, even though we'd expect it is (and we may soon update the check to validate that aspect as well!) Here is an example of a valid copyright string: "Copyright 2017 The Archivo Black Project Authors (https://github.com/Omnibus-Type/ArchivoBlack)"
🔥 FAIL: Copyright notices match canonical pattern in fonts
🔥 FAIL: Font enables smart dropout control in "prep" table instructions?--- Rationale ---
This setup is meant to ensure consistent rendering quality for fonts across all
devices (with different rendering/hinting capabilities).
Below is the snippet of instructions we expect to see in the fonts:
B8 01 FF PUSHW 0x01FF
85 SCANCTRL (unconditinally turn on
dropout control mode)
B0 04 PUSHB 0x04
8D SCANTYPE (enable smart dropout control)
"Smart dropout control" means activating rules 1, 2 and 5:
Rule 1: If a pixel's center falls within the glyph outline,
that pixel is turned on.
Rule 2: If a contour falls exactly on a pixel's center,
that pixel is turned on.
Rule 5: If a scan line between two adjacent pixel centers
(either vertical or horizontal) is intersected
by both an on-Transition contour and an off-Transition
contour and neither of the pixels was already turned on
by rules 1 and 2, turn on the pixel which is closer to
the midpoint between the on-Transition contour and
off-Transition contour. This is "Smart" dropout control.
For more detailed info (such as other rules not enabled in this snippet), please
refer to the TrueType Instruction Set documentation.
🔥 FAIL: METADATA.pb: Designer is listed with the correct name on the Google Fonts catalog of designers?
🔥 FAIL: Checking font version fields (head and name table).
⚠ WARN: DESCRIPTION.en_us.html should end in a linebreak.--- Rationale --- Some older text-handling tools sometimes misbehave if the last line of data in a text file is not terminated with a newline character (also known as '\n'). We know that this is a very small detail, but for the sake of keeping all DESCRIPTION.en_us.html files uniformly formatted throughout the GFonts collection, we chose to adopt the practice of placing this final linebreak char on them.
⚠ WARN: Check copyright namerecords match license file.--- Rationale --- A known licensing description must be provided in the NameID 14 (LICENSE DESCRIPTION) entries of the name table. The source of truth for this check (to determine which license is in use) is a file placed side-by-side to your font project including the licensing terms. Depending on the chosen license, one of the following string snippets is expected to be found on the NameID 13 (LICENSE DESCRIPTION) entries of the name table: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: License URL matches License text on name table?--- Rationale --- A known license URL must be provided in the NameID 14 (LICENSE INFO URL) entry of the name table. The source of truth for this check is the licensing text found on the NameID 13 entry (LICENSE DESCRIPTION). The string snippets used for detecting licensing terms are: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: Is the Grid-fitting and Scan-conversion Procedure ('gasp') table set to optimize rendering?--- Rationale --- Traditionally version 0 'gasp' tables were set so that font sizes below 8 ppem had no grid fitting but did have antialiasing. From 9-16 ppem, just grid fitting. And fonts above 17ppem had both antialiasing and grid fitting toggled on. The use of accelerated graphics cards and higher resolution screens make this approach obsolete. Microsoft's DirectWrite pushed this even further with much improved rendering built into the OS and apps. In this scenario it makes sense to simply toggle all 4 flags ON for all font sizes.
⚠ WARN: METADATA.pb: Fontfamily is listed on Google Fonts API?
⚠ WARN: Check if each glyph has the recommended amount of contours.--- Rationale --- Visually QAing thousands of glyphs by hand is tiring. Most glyphs can only be constructured in a handful of ways. This means a glyph's contour count will only differ slightly amongst different fonts, e.g a 'g' could either be 2 or 3 contours, depending on whether its double story or single story. However, a quotedbl should have 2 contours, unless the font belongs to a display family. This check currently does not cover variable fonts because there's plenty of alternative ways of constructing glyphs with multiple outlines for each feature in a VarFont. The expected contour count data for this check is currently optimized for the typical construction of glyphs in static fonts.
The following glyphs do not have the recommended number of contours: Glyph name: uni0E2C Contours detected: 2 Expected: 1 or 3 ⚠ WARN: Are there caret positions declared for every ligature?--- Rationale --- All ligatures in a font must have corresponding caret (text cursor) positions defined in the GDEF table, otherwhise, users may experience issues with caret rendering. If using GlyphsApp or UFOs, ligature carets can be defined as anchors with names starting with 'caret_'. These can be compiled with fontmake as of version v2.4.0.
⚠ WARN: Is there kerning info for non-ligated sequences?--- Rationale --- Fonts with ligatures should have kerning on the corresponding non-ligated sequences for text where ligatures aren't used (eg https://github.com/impallari/Raleway/issues/14).
⚠ WARN: Combined length of family and style must not exceed 27 characters.--- Rationale --- According to a GlyphsApp tutorial [1], in order to make sure all versions of Windows recognize it as a valid font file, we must make sure that the concatenated length of the familyname (NameID.FONT_FAMILY_NAME) and style (NameID.FONT_SUBFAMILY_NAME) strings in the name table do not exceed 20 characters. After discussing the problem in more detail at `FontBakery issue #2179 [2] we decided that allowing up to 27 chars would still be on the safe side, though. [1] https://glyphsapp.com/tutorials/multiple-masters-part-3-setting-up-instances [2] https://github.com/googlefonts/fontbakery/issues/2179
Please take a look at the conversation at fonttools/fontbakery#2179 in order to understand the reasoning behind these name table records max-length criteria. [code: too-long] ⚠ WARN: Are there any misaligned on-curve points?
--- Rationale --- This check heuristically looks for on-curve points which are close to, but do not sit on, significant boundary coordinates. For example, a point which has a Y-coordinate of 1 or -1 might be a misplaced baseline point. As well as the baseline, here we also check for points near the x-height (but only for lower case Latin letters), cap-height, ascender and descender Y coordinates. Not all such misaligned curve points are a mistake, and sometimes the design may call for points in locations near the boundaries. As this check is liable to generate significant numbers of false positives, it will pass if there are more than 100 reported misalignments.
[18] IBMPlexSansThaiLooped-SemiBold.ttf🔥 FAIL: Does DESCRIPTION file contain a upstream Git repo URL?--- Rationale --- The contents of the DESCRIPTION.en-us.html file are displayed on the Google Fonts website in the about section of each font family specimen page. Since all of the Google Fonts collection is composed of libre-licensed fonts, this check enforces a policy that there must be a hypertext link in that page directing users to the repository where the font project files are made available. Such hosting is typically done on sites like Github, Gitlab, GNU Savannah or any other git-based version control service.
🔥 FAIL: Substitute copyright, registered and trademark symbols in name table entries.
🔥 FAIL: Check license file has good copyright string.--- Rationale --- An OFL.txt file's first line should be the font copyright e.g: "Copyright 2019 The Montserrat Project Authors (https://github.com/julietaula/montserrat)"
🔥 FAIL: Copyright notices match canonical pattern in METADATA.pb--- Rationale --- The expected pattern for the copyright string adheres to the following rules: * It must say "Copyright" followed by a 4 digit year (optionally followed by a hyphen and another 4 digit year) * Then it must say "The <familyname> Project Authors" * And within parentheses, a URL for a git repository must be provided * The check is case insensitive and does not validate whether the familyname is correct, even though we'd expect it is (and we may soon update the check to validate that aspect as well!) Here is an example of a valid copyright string: "Copyright 2017 The Archivo Black Project Authors (https://github.com/Omnibus-Type/ArchivoBlack)"
🔥 FAIL: Copyright notices match canonical pattern in fonts
🔥 FAIL: Font enables smart dropout control in "prep" table instructions?--- Rationale ---
This setup is meant to ensure consistent rendering quality for fonts across all
devices (with different rendering/hinting capabilities).
Below is the snippet of instructions we expect to see in the fonts:
B8 01 FF PUSHW 0x01FF
85 SCANCTRL (unconditinally turn on
dropout control mode)
B0 04 PUSHB 0x04
8D SCANTYPE (enable smart dropout control)
"Smart dropout control" means activating rules 1, 2 and 5:
Rule 1: If a pixel's center falls within the glyph outline,
that pixel is turned on.
Rule 2: If a contour falls exactly on a pixel's center,
that pixel is turned on.
Rule 5: If a scan line between two adjacent pixel centers
(either vertical or horizontal) is intersected
by both an on-Transition contour and an off-Transition
contour and neither of the pixels was already turned on
by rules 1 and 2, turn on the pixel which is closer to
the midpoint between the on-Transition contour and
off-Transition contour. This is "Smart" dropout control.
For more detailed info (such as other rules not enabled in this snippet), please
refer to the TrueType Instruction Set documentation.
🔥 FAIL: METADATA.pb: Designer is listed with the correct name on the Google Fonts catalog of designers?
🔥 FAIL: Checking font version fields (head and name table).
⚠ WARN: DESCRIPTION.en_us.html should end in a linebreak.--- Rationale --- Some older text-handling tools sometimes misbehave if the last line of data in a text file is not terminated with a newline character (also known as '\n'). We know that this is a very small detail, but for the sake of keeping all DESCRIPTION.en_us.html files uniformly formatted throughout the GFonts collection, we chose to adopt the practice of placing this final linebreak char on them.
⚠ WARN: Check copyright namerecords match license file.--- Rationale --- A known licensing description must be provided in the NameID 14 (LICENSE DESCRIPTION) entries of the name table. The source of truth for this check (to determine which license is in use) is a file placed side-by-side to your font project including the licensing terms. Depending on the chosen license, one of the following string snippets is expected to be found on the NameID 13 (LICENSE DESCRIPTION) entries of the name table: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: License URL matches License text on name table?--- Rationale --- A known license URL must be provided in the NameID 14 (LICENSE INFO URL) entry of the name table. The source of truth for this check is the licensing text found on the NameID 13 entry (LICENSE DESCRIPTION). The string snippets used for detecting licensing terms are: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: Is the Grid-fitting and Scan-conversion Procedure ('gasp') table set to optimize rendering?--- Rationale --- Traditionally version 0 'gasp' tables were set so that font sizes below 8 ppem had no grid fitting but did have antialiasing. From 9-16 ppem, just grid fitting. And fonts above 17ppem had both antialiasing and grid fitting toggled on. The use of accelerated graphics cards and higher resolution screens make this approach obsolete. Microsoft's DirectWrite pushed this even further with much improved rendering built into the OS and apps. In this scenario it makes sense to simply toggle all 4 flags ON for all font sizes.
⚠ WARN: METADATA.pb: Fontfamily is listed on Google Fonts API?
⚠ WARN: Check if each glyph has the recommended amount of contours.--- Rationale --- Visually QAing thousands of glyphs by hand is tiring. Most glyphs can only be constructured in a handful of ways. This means a glyph's contour count will only differ slightly amongst different fonts, e.g a 'g' could either be 2 or 3 contours, depending on whether its double story or single story. However, a quotedbl should have 2 contours, unless the font belongs to a display family. This check currently does not cover variable fonts because there's plenty of alternative ways of constructing glyphs with multiple outlines for each feature in a VarFont. The expected contour count data for this check is currently optimized for the typical construction of glyphs in static fonts.
The following glyphs do not have the recommended number of contours: Glyph name: uni0E12 Contours detected: 4 Expected: 1 or 3 ⚠ WARN: Are there caret positions declared for every ligature?--- Rationale --- All ligatures in a font must have corresponding caret (text cursor) positions defined in the GDEF table, otherwhise, users may experience issues with caret rendering. If using GlyphsApp or UFOs, ligature carets can be defined as anchors with names starting with 'caret_'. These can be compiled with fontmake as of version v2.4.0.
⚠ WARN: Is there kerning info for non-ligated sequences?--- Rationale --- Fonts with ligatures should have kerning on the corresponding non-ligated sequences for text where ligatures aren't used (eg https://github.com/impallari/Raleway/issues/14).
⚠ WARN: Combined length of family and style must not exceed 27 characters.--- Rationale --- According to a GlyphsApp tutorial [1], in order to make sure all versions of Windows recognize it as a valid font file, we must make sure that the concatenated length of the familyname (NameID.FONT_FAMILY_NAME) and style (NameID.FONT_SUBFAMILY_NAME) strings in the name table do not exceed 20 characters. After discussing the problem in more detail at `FontBakery issue #2179 [2] we decided that allowing up to 27 chars would still be on the safe side, though. [1] https://glyphsapp.com/tutorials/multiple-masters-part-3-setting-up-instances [2] https://github.com/googlefonts/fontbakery/issues/2179
Please take a look at the conversation at fonttools/fontbakery#2179 in order to understand the reasoning behind these name table records max-length criteria. [code: too-long] ⚠ WARN: Are there any misaligned on-curve points?
--- Rationale --- This check heuristically looks for on-curve points which are close to, but do not sit on, significant boundary coordinates. For example, a point which has a Y-coordinate of 1 or -1 might be a misplaced baseline point. As well as the baseline, here we also check for points near the x-height (but only for lower case Latin letters), cap-height, ascender and descender Y coordinates. Not all such misaligned curve points are a mistake, and sometimes the design may call for points in locations near the boundaries. As this check is liable to generate significant numbers of false positives, it will pass if there are more than 100 reported misalignments.
[20] IBMPlexSansThaiLooped-Thin.ttf🔥 FAIL: Does DESCRIPTION file contain a upstream Git repo URL?--- Rationale --- The contents of the DESCRIPTION.en-us.html file are displayed on the Google Fonts website in the about section of each font family specimen page. Since all of the Google Fonts collection is composed of libre-licensed fonts, this check enforces a policy that there must be a hypertext link in that page directing users to the repository where the font project files are made available. Such hosting is typically done on sites like Github, Gitlab, GNU Savannah or any other git-based version control service.
🔥 FAIL: Substitute copyright, registered and trademark symbols in name table entries.
🔥 FAIL: Check license file has good copyright string.--- Rationale --- An OFL.txt file's first line should be the font copyright e.g: "Copyright 2019 The Montserrat Project Authors (https://github.com/julietaula/montserrat)"
🔥 FAIL: Copyright notices match canonical pattern in METADATA.pb--- Rationale --- The expected pattern for the copyright string adheres to the following rules: * It must say "Copyright" followed by a 4 digit year (optionally followed by a hyphen and another 4 digit year) * Then it must say "The <familyname> Project Authors" * And within parentheses, a URL for a git repository must be provided * The check is case insensitive and does not validate whether the familyname is correct, even though we'd expect it is (and we may soon update the check to validate that aspect as well!) Here is an example of a valid copyright string: "Copyright 2017 The Archivo Black Project Authors (https://github.com/Omnibus-Type/ArchivoBlack)"
🔥 FAIL: Copyright notices match canonical pattern in fonts
🔥 FAIL: Font enables smart dropout control in "prep" table instructions?--- Rationale ---
This setup is meant to ensure consistent rendering quality for fonts across all
devices (with different rendering/hinting capabilities).
Below is the snippet of instructions we expect to see in the fonts:
B8 01 FF PUSHW 0x01FF
85 SCANCTRL (unconditinally turn on
dropout control mode)
B0 04 PUSHB 0x04
8D SCANTYPE (enable smart dropout control)
"Smart dropout control" means activating rules 1, 2 and 5:
Rule 1: If a pixel's center falls within the glyph outline,
that pixel is turned on.
Rule 2: If a contour falls exactly on a pixel's center,
that pixel is turned on.
Rule 5: If a scan line between two adjacent pixel centers
(either vertical or horizontal) is intersected
by both an on-Transition contour and an off-Transition
contour and neither of the pixels was already turned on
by rules 1 and 2, turn on the pixel which is closer to
the midpoint between the on-Transition contour and
off-Transition contour. This is "Smart" dropout control.
For more detailed info (such as other rules not enabled in this snippet), please
refer to the TrueType Instruction Set documentation.
🔥 FAIL: METADATA.pb: Designer is listed with the correct name on the Google Fonts catalog of designers?
🔥 FAIL: Checking font version fields (head and name table).
⚠ WARN: DESCRIPTION.en_us.html should end in a linebreak.--- Rationale --- Some older text-handling tools sometimes misbehave if the last line of data in a text file is not terminated with a newline character (also known as '\n'). We know that this is a very small detail, but for the sake of keeping all DESCRIPTION.en_us.html files uniformly formatted throughout the GFonts collection, we chose to adopt the practice of placing this final linebreak char on them.
⚠ WARN: Check copyright namerecords match license file.--- Rationale --- A known licensing description must be provided in the NameID 14 (LICENSE DESCRIPTION) entries of the name table. The source of truth for this check (to determine which license is in use) is a file placed side-by-side to your font project including the licensing terms. Depending on the chosen license, one of the following string snippets is expected to be found on the NameID 13 (LICENSE DESCRIPTION) entries of the name table: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: License URL matches License text on name table?--- Rationale --- A known license URL must be provided in the NameID 14 (LICENSE INFO URL) entry of the name table. The source of truth for this check is the licensing text found on the NameID 13 entry (LICENSE DESCRIPTION). The string snippets used for detecting licensing terms are: - "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL" - "Licensed under the Apache License, Version 2.0" - "Licensed under the Ubuntu Font Licence 1.0." Currently accepted licenses are Apache or Open Font License. For a small set of legacy families the Ubuntu Font License may be acceptable as well. When in doubt, please choose OFL for new font projects.
⚠ WARN: Is the Grid-fitting and Scan-conversion Procedure ('gasp') table set to optimize rendering?--- Rationale --- Traditionally version 0 'gasp' tables were set so that font sizes below 8 ppem had no grid fitting but did have antialiasing. From 9-16 ppem, just grid fitting. And fonts above 17ppem had both antialiasing and grid fitting toggled on. The use of accelerated graphics cards and higher resolution screens make this approach obsolete. Microsoft's DirectWrite pushed this even further with much improved rendering built into the OS and apps. In this scenario it makes sense to simply toggle all 4 flags ON for all font sizes.
⚠ WARN: METADATA.pb: Fontfamily is listed on Google Fonts API?
⚠ WARN: Check if each glyph has the recommended amount of contours.--- Rationale --- Visually QAing thousands of glyphs by hand is tiring. Most glyphs can only be constructured in a handful of ways. This means a glyph's contour count will only differ slightly amongst different fonts, e.g a 'g' could either be 2 or 3 contours, depending on whether its double story or single story. However, a quotedbl should have 2 contours, unless the font belongs to a display family. This check currently does not cover variable fonts because there's plenty of alternative ways of constructing glyphs with multiple outlines for each feature in a VarFont. The expected contour count data for this check is currently optimized for the typical construction of glyphs in static fonts.
The following glyphs do not have the recommended number of contours: Glyph name: uni0E2C Contours detected: 2 Expected: 1 or 3 ⚠ WARN: Are there caret positions declared for every ligature?--- Rationale --- All ligatures in a font must have corresponding caret (text cursor) positions defined in the GDEF table, otherwhise, users may experience issues with caret rendering. If using GlyphsApp or UFOs, ligature carets can be defined as anchors with names starting with 'caret_'. These can be compiled with fontmake as of version v2.4.0.
⚠ WARN: Is there kerning info for non-ligated sequences?--- Rationale --- Fonts with ligatures should have kerning on the corresponding non-ligated sequences for text where ligatures aren't used (eg https://github.com/impallari/Raleway/issues/14).
⚠ WARN: Combined length of family and style must not exceed 27 characters.--- Rationale --- According to a GlyphsApp tutorial [1], in order to make sure all versions of Windows recognize it as a valid font file, we must make sure that the concatenated length of the familyname (NameID.FONT_FAMILY_NAME) and style (NameID.FONT_SUBFAMILY_NAME) strings in the name table do not exceed 20 characters. After discussing the problem in more detail at `FontBakery issue #2179 [2] we decided that allowing up to 27 chars would still be on the safe side, though. [1] https://glyphsapp.com/tutorials/multiple-masters-part-3-setting-up-instances [2] https://github.com/googlefonts/fontbakery/issues/2179
Please take a look at the conversation at fonttools/fontbakery#2179 in order to understand the reasoning behind these name table records max-length criteria. [code: too-long] ⚠ WARN: Are there any misaligned on-curve points?
--- Rationale --- This check heuristically looks for on-curve points which are close to, but do not sit on, significant boundary coordinates. For example, a point which has a Y-coordinate of 1 or -1 might be a misplaced baseline point. As well as the baseline, here we also check for points near the x-height (but only for lower case Latin letters), cap-height, ascender and descender Y coordinates. Not all such misaligned curve points are a mistake, and sometimes the design may call for points in locations near the boundaries. As this check is liable to generate significant numbers of false positives, it will pass if there are more than 100 reported misalignments.
⚠ WARN: Do outlines contain any jaggy segments?
--- Rationale --- This check heuristically detects outline segments which form a particularly small angle, indicative of an outline error. This may cause false positives in cases such as extreme ink traps, so should be regarded as advisory and backed up by manual inspection.
⚠ WARN: Do outlines contain any semi-vertical or semi-horizontal lines?
--- Rationale --- This check detects line segments which are nearly, but not quite, exactly horizontal or vertical. Sometimes such lines are created by design, but often they are indicative of a design error. This check is disabled for italic styles, which often contain nearly-upright lines.
Summary
Note: The following loglevels were omitted in this report:
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7690c08: [gftools-packager] IBM Plex Sans Thai Looped: Version 1.1 added
4a48ff0: [gftools-packager] ofl/ibmplexsansthailooped remove METADATA "source". #2587