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Codechange: Scale sprite font size once. #9158

merged 2 commits into from
May 1, 2021


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@PeterN PeterN commented May 1, 2021

Motivation / Problem

Calling GetHeight() on a sprite font calls ScaleFontTrad() every time. This cascades back to all GetCharacterHeight(FS_xxx) and all FONT_HEIGHT_xxx calls.
Scaling is not expensive, but it does not change either -- the cache is reset if the zoom level is changed. This call is also a virtual method call.


The change sets the scaled font height once on init instead of every call to GetHeight(). This also avoids the need for GetHeight() to be a virtual method call.

Also included slightly randomly is a clean up to remove a direct access to the _default_font_height array in the FreeTypeFontCache.


Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

  • The bug fix is important enough to be backported? (label: 'backport requested')
  • This PR affects the save game format? (label 'savegame upgrade')
  • This PR affects the GS/AI API? (label 'needs review: Script API')
    • ai_changelog.hpp, gs_changelog.hpp need updating.
    • The compatibility wrappers (compat_*.nut) need updating.
  • This PR affects the NewGRF API? (label 'needs review: NewGRF')

PeterN added 2 commits May 1, 2021 09:23
This makes this part of font size setup in FreeTypeFontCache consist with OSX and Windows variants.
…ll to GetHeight().

Scaling is not expensive, but it does not change either, and this avoids the need for a virtual method call. This cascades back to all GetCharacterHeight(FS_xxx) and FONT_HEIGHT_xxx calls.
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@PeterN PeterN merged commit 9c6c0a0 into OpenTTD:master May 1, 2021
@PeterN PeterN deleted the default-font-size branch May 1, 2021 09:41
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2 participants