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Code Issues 9 Releases Wiki Activity

Improve `gasp' table documentation.

This commit is contained in:
Werner Lemberg 2011-01-05 22:21:33 +01:00
parent 55e6a6fadf
commit a399588ae2
1 changed files with 13 additions and 5 deletions
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18
include/freetype/ftgasp.h
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@ -4,7 +4,7 @@
/* */
/* Access of TrueType's `gasp' table (specification). */
/* */
/* Copyright 2007, 2008 by */
/* Copyright 2007, 2008, 2011 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -62,19 +62,27 @@
* It is up to the client to decide what to do.
*
* FT_GASP_DO_GRIDFIT ::
* Grid-fitting and hinting should be performed at the specified ppem.
* This *really* means TrueType bytecode interpretation.
* Grid-fitting and hinting should be performed at the specified ppem.
* This *really* means TrueType bytecode interpretation. If this bit
* is not set, no hinting gets applied.
*
* FT_GASP_DO_GRAY ::
* Anti-aliased rendering should be performed at the specified ppem.
* Anti-aliased rendering should be performed at the specified ppem.
* If not set, do monochrome rendering.
*
* FT_GASP_SYMMETRIC_SMOOTHING ::
* Smoothing along multiple axes must be used with ClearType.
* If set, smoothing along multiple axes must be used with ClearType.
*
* FT_GASP_SYMMETRIC_GRIDFIT ::
* Grid-fitting must be used with ClearType's symmetric smoothing.
*
* @note:
* The bit-flags `FT_GASP_DO_GRIDFIT' and `FT_GASP_DO_GRAY' are to be
* used for standard font rasterization only. Independently of that,
* `FT_GASP_SYMMETRIC_SMOOTHING' and `FT_GASP_SYMMETRIC_GRIDFIT' are to
* be used if ClearType is enabled (and `FT_GASP_DO_GRIDFIT' and
* `FT_GASP_DO_GRAY' are consequently ignored).
*
* `ClearType' is Microsoft's implementation of LCD rendering, partly
* protected by patents.
*