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ttinterp.c: Improve documentation of engine compensation.

This commit is contained in:
Werner Lemberg 2019-05-21 09:57:38 +02:00
parent 141e3173db
commit 8eafa52830
1 changed files with 11 additions and 5 deletions
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16
src/truetype/ttobjs.c
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@ -1109,11 +1109,17 @@
tt_metrics->rotated = FALSE;
tt_metrics->stretched = FALSE;
/* set default engine compensation */
tt_metrics->compensations[0] = 0; /* gray */
tt_metrics->compensations[1] = 0; /* black */
tt_metrics->compensations[2] = 0; /* white */
tt_metrics->compensations[3] = 0; /* reserved */
/* Set default engine compensation. Value 3 is not described */
/* in the OpenType specification (as of Mai 2019), but Greg */
/* says that MS handles it the same as `gray'. */
/* */
/* The Apple specification says that the compensation for */
/* `gray' is always zero. FreeType doesn't do any */
/* compensation at all. */
tt_metrics->compensations[0] = 0; /* gray */
tt_metrics->compensations[1] = 0; /* black */
tt_metrics->compensations[2] = 0; /* white */
tt_metrics->compensations[3] = 0; /* the same as gray */
}
/* allocate function defs, instruction defs, cvt, and storage area */