shithub: freetype+ttf2subf

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[truetype] Honor FT_LOAD_ADVANCE_ONLY if `hdmx` is usable.

This simply shortcuts the glyph loading if FT_LOAD_ADVANCE_ONLY
is specified by FT_Get_Advances and the `hdmx` data are located.
Particularly, the classic v35 interpreter or "verified" ClearType
fonts might see 100x speed up in retrieving the hdmx cache.

* src/truetype/ttgload.c (TT_Load_Glyph): Insert the shortcut.

git/fs: mount .git/fs: mount/attach disallowed

--- a/src/truetype/ttgload.c

+++ b/src/truetype/ttgload.c

@@ -2945,6 +2945,15 @@

     if ( error )

       goto Exit;

+    /* done if we are only interested in the `hdmx` advance */

+    if ( load_flags & FT_LOAD_ADVANCE_ONLY         &&

+         !( load_flags & FT_LOAD_VERTICAL_LAYOUT ) &&

+         loader.widthp                             )

+    {

+      glyph->metrics.horiAdvance = loader.widthp[glyph_index] * 64;

+      goto Done;

+    }

+

     glyph->format        = FT_GLYPH_FORMAT_OUTLINE;

     glyph->num_subglyphs = 0;

     glyph->outline.flags = 0;

@@ -3023,6 +3032,7 @@

                 glyph->outline.n_points,

                 glyph->outline.flags ));

+  Done:

     tt_loader_done( &loader );

   Exit: