[Git][freetype/freetype][undefined_scale] Draft: [base] Undefined scale means no scale.

[Alexei Podtelezhnikov (@apodtele)]

Alexei Podtelezhnikov pushed to branch undefined_scale at FreeType / FreeType

Commits:

• a9778741
  by Alexei Podtelezhnikov at 2022-01-18T22:46:36-05:00

  Draft: [base] Undefined scale means no scale.
  
  It might be surprising that FreeType does not have default ppem and
  the size has to be set explicitly or face undefined behavior with
  undefined variables and errors. This offers an alternative to
  missing or zero scale by simply setting FT_LOAD_NO_SCALE.
  
  This is alternative to !132 and discussed in
    https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=43708
  
  * src/base/ftobjs.c (FT_Load_Glyph): Deal with zero scale.
  

1 changed file:

• src/base/ftobjs.c

Changes:

src/base/ftobjs.c

---

...	...	@@ -858,6 +858,11 @@
858	858	library = driver->root.library;
859	859	hinter = library->auto_hinter;
860	860
	861	+ /* undefined scale means no scale */
	862	+ if ( face->size->metrics.x_ppem == 0 ||
	863	+ face->size->metrics.y_ppem == 0 )
	864	+ load_flags |= FT_LOAD_NO_SCALE;
	865	+
861	866	/* resolve load flags dependencies */
862	867
863	868	if ( load_flags & FT_LOAD_NO_RECURSE )

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