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Comment on no-stem-darkening & darkening-parameters

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Dave Arnold 2013-10-10 13:36:49 -07:00 committed by Werner Lemberg
parent 4d87ac8a7f
commit 4cfa8fc5be
1 changed files with 7 additions and 5 deletions
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12
include/freetype/ftcffdrv.h
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@ -173,8 +173,9 @@ FT_BEGIN_HEADER
*
* @description:
* By default, the Adobe CFF engine darkens stems at smaller sizes,
* regardless of hinting, to enhance contrast. Setting this property,
* stem darkening gets switched off.
* regardless of hinting, to enhance contrast. This feature requires
* a rendering system with proper gamma correction. Setting this
* property, stem darkening gets switched off.
*
* Note that stem darkening is never applied if @FT_LOAD_NO_SCALE is set.
*
@ -231,9 +232,10 @@ FT_BEGIN_HEADER
*
* The x~values give the stem width, and the y~values the darkening
* amount. The unit is 1000th of pixels. All coordinate values must be
* positive; the x~values must be monotonically increasing, and the
* y~values smaller than or equal to 500 (corresponding to half a
* pixel).
* positive; the x~values must be monotonically increasing; the
* y~values must be monotonically decreasing and smaller than or
* equal to 500 (corresponding to half a pixel); the slope of each
* linear piece must be shallower than -1 (e.g., -.4).
*
* @note:
* This property can be used with @FT_Property_Get also.