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[truetype/v40] Fix ROUND_XY_TO_GRID handling.

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Fixes #1346.

* src/truetype/ttgload.c (TT_Process_Composite_Component): Round
the x-position unless in backward_compatibility mode.
This commit is contained in:
Alexei Podtelezhnikov
2025-08-01 11:01:16 -04:00
parent 6c18a397cb
commit 08805be530
1 changed files with 7 additions and 22 deletions
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29
src/truetype/ttgload.c
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@@ -1144,30 +1144,15 @@
x = FT_MulFix( x, x_scale );
y = FT_MulFix( y, y_scale );
if ( subglyph->flags & ROUND_XY_TO_GRID )
if ( subglyph->flags & ROUND_XY_TO_GRID &&
IS_HINTED( loader->load_flags ) )
{
TT_Face face = loader->face;
TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );
#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
if ( !loader->exec->backward_compatibility )
#endif
x = FT_PIX_ROUND( x );
if ( IS_HINTED( loader->load_flags ) )
{
/*
* We round the horizontal offset only if there is hinting along
* the x axis; this corresponds to integer advance width values.
*
* Theoretically, a glyph's bytecode can toggle ClearType's
* `backward compatibility' mode, which would allow modification
* of the advance width. In reality, however, applications
* neither allow nor expect modified advance widths if subpixel
* rendering is active.
*
*/
if ( driver->interpreter_version == TT_INTERPRETER_VERSION_35 )
x = FT_PIX_ROUND( x );
y = FT_PIX_ROUND( y );
}
y = FT_PIX_ROUND( y );
}
}
}