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Issue 661178 link

Starred by 1 user
Status: Available
Owner: ----
Cc:
█ zakerinasab@chromium.org
fs...@chromium.org
e...@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Windows
Pri: 3
Type: Bug



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Subscript and superscript baselines do not work properly for small fonts on low DPI Windows machines

Project Member Reported by zakerinasab@chromium.org, Nov 1 2016 
When the font size is small (<1), superscript and subscript tags (baseline-shift="super" and baseline-shift="sub") do not make any difference in the baseline on low-DPI Windows machines. This happens because subpixel text rendering is turned off for very small fonts in FontPlatformData::setupPaint (in FontPlatformDataWin.cpp).

Fixing this bug must correct the following layout test results on Windows try-bots (not the local Windows machines with high-DPI). Please use rebaseline-cl to make sure results are correct on try bots.

third_party/WebKit/LayoutTests/fast/canvas/canvas-text-baseline-tiny-fonts.html
third_party/WebKit/LayoutTests/svg/batik/text/smallFonts.svg
third_party/WebKit/LayoutTests/svg/batik/text/svg-text-super-sub-tiny-fonts.svg

This bug is related to  crbug.com/656638 .

Expected behavior: Superscript and subscript tags must properly shift the baseline.
svg-text-super-sub-tiny-fonts.svg
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Current.png
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Expected.png
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smallFonts.svg
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Current-2.png
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Expected-2.png
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canvas-text-baseline-tiny-fonts.html
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Current-3.png
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Expected-3.png
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Comment 1 by e...@chromium.org, Nov 1 2016

Status: Available (was: Untriaged)
Project Member

Comment 2 by sheriffbot@chromium.org, Nov 2 2017

Labels: Hotlist-Recharge-Cold
Status: Untriaged (was: Available)
This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available. If you change it back, also remove the "Hotlist-Recharge-Cold" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Comment 3 by junov@chromium.org, Nov 2 2017

Owner: fs...@chromium.org
Status: Assigned (was: Untriaged)

Comment 4 by junov@chromium.org, Jul 25

Cc: -junov@chromium.org

Comment 5 by fs...@chromium.org, Aug 13

Cc: fs...@chromium.org
Owner: ----
Status: Available (was: Assigned)
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