Simplify the default font size calculation for the spellchecker underline

RESOLVED FIXED in Firefox 55

Status

()

enhancement
P1
normal
RESOLVED FIXED
2 years ago
2 years ago

People

(Reporter: jj.evelyn, Assigned: jj.evelyn)

Tracking

(Blocks 2 bugs, {perf})

50 Branch
mozilla55
Points:
---
Dependency tree / graph

Firefox Tracking Flags

(firefox55 fixed)

Details

(Whiteboard: [qf:p1])

Attachments

(1 attachment)

Assignee

Description

2 years ago
+++ This bug was initially created as a clone of Bug #1354641 +++

From profile [1] and code [2] it shows we spend some time to calculate the thickness of the spellchecker underline when every time selectedframes is called. We might be able to calculate this value directly from PresContext instead of creating a temporary nsStyleFont object to do a bunch of expensive work.

[1] https://perfht.ml/2p4IE6S
[2] http://searchfox.org/mozilla-central/source/layout/generic/nsTextFrame.cpp#5798-5805
Assignee

Updated

2 years ago
Whiteboard: [e10s-multi:-][qf:p1] → [qf]
Assignee

Updated

2 years ago
Blocks: 1355600
Assignee

Updated

2 years ago
No longer blocks: 1355600
Comment hidden (mozreview-request)
Assignee

Comment 2

2 years ago
David, I saw you reviewed bug 486735 so set review request to you. Feel free to point to someone else if you are busy. Thanks!
Assignee

Comment 3

2 years ago
profile after applying this patch: https://perfht.ml/2opWylH.
Comment on attachment 8857223 [details]
Bug 1355595 - Simplify the default font size calculation;

https://reviewboard.mozilla.org/r/129160/#review131682

r=dbaron with these three comments:

::: layout/generic/nsTextFrame.cpp:5805
(Diff revision 1)
> -      gfxFloat fontSize = std::min(gfxFloat(defaultFontSize),
> +      int32_t scaledFontSize = aPresContext->AppUnitsToDevPixels(
> +          defaultFontSize * aPresContext->EffectiveTextZoom());

I think it's clearer to continue using the nsStyleFont::ZoomText function here, i.e., by replacing the manual multiplication of "defaultFontSize * aPresContext->EffectiveTextZoom()" with nsStyleFont::ZoomText(aPresContext, defaultFontSize)".  (I think the rounding is different, maybe, depending on what NSToCoordTruncClamped does.  It's also clearer.)

I'd also call the resulting variable zoomedFontSize rather than scaledFontSize, since scaled could mean so many other things.

::: layout/generic/nsTextFrame.cpp:5807
(Diff revision 1)
> +      gfxFloat fontSize = std::min(gfxFloat(scaledFontSize),
>                                   aFontMetrics.emHeight);

While you're here, please line up the indentation of the two arguments to std::min(), or just fit them one one line if they fit within 80 characters.  They were probably misaligned after some previous mass-edit.
Attachment #8857223 - Flags: review?(dbaron) → review+
Comment hidden (mozreview-request)

Comment 7

2 years ago
Pushed by ehung@mozilla.com:
https://hg.mozilla.org/integration/autoland/rev/abfece312d74
Simplify the default font size calculation; r=dbaron
Assignee

Comment 8

2 years ago
Thanks for the review! David.
commend addressed and trigger auto-land on mozreview.
Assignee

Updated

2 years ago
Assignee: nobody → ehung
Status: NEW → ASSIGNED

Comment 9

2 years ago
bugherder
https://hg.mozilla.org/mozilla-central/rev/abfece312d74
Status: ASSIGNED → RESOLVED
Last Resolved: 2 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla55
Duplicate of this bug: 1355600

Updated

2 years ago
Whiteboard: [qf] → [qf:p1]
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