The FreeType Project - Bugs: bug #54565, Upside down transform and...
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bug #54565: Upside down transform and FT_GlyphSlot_Oblique made opposite angle
Submitter: | Toshio Nakamura <tnakamura> | ||
Submitted: | Fri 24 Aug 2018 06:19:11 AM UTC | ||
Severity: | 3 - Normal | Item Group: | Incorrect behaviour |
Status: | Invalid | Privacy: | Public |
Assigned to: | podtelez | Open/Closed: | Closed |
Planned Release: | None |
Jump to the original submission
Mon 19 Aug 2019 02:56:05 PM UTC, comment #8: |
Alexei Podtelezhnikov <podtelez> |
Mon 19 Aug 2019 01:44:31 PM UTC, comment #7: What if one wants to render an italicized glyph which is rotated 90 degrees? Loading glyph via 'FT_Load_Glyph' using rotation matrix, and then calling 'FT_GlyphSlot_Oblique' won't work because the latter will add a slant along the wrong axis.
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Dmitry Batrak <dbatrak> |
Sat 06 Apr 2019 05:14:11 AM UTC, comment #6: I'm closing this now as invalid. Please feel free to add more information in case it becomes available. |
Werner LEMBERG <wl> |
Wed 05 Sep 2018 01:49:05 AM UTC, comment #5: Hi Werner,
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Toshio Nakamura <tnakamura> |
Tue 04 Sep 2018 07:06:54 PM UTC, comment #4: Toshio-san, any comments from the OpenJDK people? |
Werner LEMBERG <wl> |
Mon 27 Aug 2018 01:48:52 AM UTC, comment #3: Thank you for the quick replys. I'll report this issue to OpenJDK community. |
Toshio Nakamura <tnakamura> |
Fri 24 Aug 2018 01:21:36 PM UTC, comment #2: I also think that everything is fine. Both transformations applied correctly: first reflection then slant. In the mirror world both slanting angle and text direction would appear opposite. Are you sure you want mirror reflection and not rotation by 180 degrees? In the rotated world you would indeed preserve slanting angle and text direction. |
Alexei Podtelezhnikov <podtelez> |
Fri 24 Aug 2018 06:57:33 AM UTC, comment #1: Thanks for the report and the code example.
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Werner LEMBERG <wl> |
Fri 24 Aug 2018 06:19:11 AM UTC, original submission:
When we transformed upside down by FT_Set_Transform() and to set italic style by FT_GlyphSlot_Oblique(), The angle of italic shape is opposite.
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Toshio Nakamura <tnakamura> |
Depends on the following items: None found
Items that depend on this one: None found
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Follow 6 latest changes.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2019-04-06 | wl | Status | None | Invalid | |
Open/Closed | Open | Closed | |||
2018-08-24 | wl | Assigned to | None | podtelez | |
2018-08-24 | tnakamura | Attached File | - | Added invItalic.cpp, #44845 | |
Attached File | - | Added Out.svg, #44846 | |||
Carbon-Copy | - | Added tnakamura |
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Corresponding source code
Matrix operations don’t commute. It will never be obvious. So yes, to satisfy specific needs, specific matrix needs to be calculated.