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[autofit] Add stem-darkening properties. 

Actual code follows in a later commit.

* include/freetype/ftautoh.h: Document `no-stem-darkening' and
`darkening-parameters'.

* src/autofit/afmodule.h: New fields `no_stem_darkening' and
`darken_params'.

* src/autofit/afmodule.c (af_property_set, af_property_get):
Handle them.
(af_autofitter_init): Initialize them.
This commit is contained in:
Nikolaus Waxweiler 2015-11-02 09:06:36 +01:00 committed by Werner Lemberg
parent 6bda921da0
commit d682e51062
4 changed files with 150 additions and 3 deletions
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16
ChangeLog
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@ -1,3 +1,19 @@
2015-11-02 Nikolaus Waxweiler <madigens@gmail.com>
[autofit] Add stem-darkening properties.
Actual code follows in a later commit.
* include/freetype/ftautoh.h: Document `no-stem-darkening' and
`darkening-parameters'.
* src/autofit/afmodule.h: New fields `no_stem_darkening' and
`darken_params'.
* src/autofit/afmodule.c (af_property_set, af_property_get):
Handle them.
(af_autofitter_init): Initialize them.
2015-11-02 Bungeman <bungeman@gmail.com>
[ftfuzzer] Add support for multiple files (patch #8779).

52
include/freetype/ftautoh.h
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@ -439,6 +439,58 @@ FT_BEGIN_HEADER
*/
/**************************************************************************
*
* @property:
* no-stem-darkening
*
* @description:
* *Experimental* *only*
*
* The main purpose of emboldening glyphs or `stem darkening' is to
* enhance readability at smaller sizes. The smaller the size, the more
* emboldening is applied to keep glyphs from `thinning out'. All
* glyphs that pass through the autohinter will be emboldened unless
* this property is set to TRUE.
*
* See the description of the CFF driver for algorithmic details. Total
* consistency with the CFF driver is currently not achieved because the
* emboldening method differs and glyphs must be scaled down on the
* Y-axis to keep outline points inside their precomputed blue zones.
* The smaller the size (especially 9ppem and down), the higher the loss
* of emboldening versus the CFF driver.
*
* *ATTENTION*: This feature has been developed with linear alpha
* blending and gamma correction of glyphs in mind: A rendering library
* must apply linear alpha blending while compositing glyph bitmaps onto
* a surface and then apply gamma correction to the glyph pixels to get
* from linear space to display space (unless the display works in
* linear space). Internal testing at Adobe found that a gamma
* correction value of 1.8 gives good results across a wide range of
* displays with a sRGB gamma curve or a similar one.
*
* If this is not possible, it might be better to disable stem
* darkening. Currently, this can only be done globally.
*
*/
/**************************************************************************
*
* @property:
* darkening-parameters
*
* @description:
* *Experimental* *only*
*
* See the description of the CFF driver for details. This
* implementation appropriates the
* CFF_CONFIG_OPTION_DARKENING_PARAMETER_* #defines for consistency.
* Note the differences described in @no-stem-darkening.
*
*/
/* */

77
src/autofit/afmodule.c
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@ -177,6 +177,46 @@
return error;
}
#endif /* AF_CONFIG_OPTION_USE_WARPER */
else if ( !ft_strcmp( property_name, "darkening-parameters" ) )
{
FT_Int* darken_params = (FT_Int*)value;
FT_Int x1 = darken_params[0];
FT_Int y1 = darken_params[1];
FT_Int x2 = darken_params[2];
FT_Int y2 = darken_params[3];
FT_Int x3 = darken_params[4];
FT_Int y3 = darken_params[5];
FT_Int x4 = darken_params[6];
FT_Int y4 = darken_params[7];
if ( x1 < 0 || x2 < 0 || x3 < 0 || x4 < 0 ||
y1 < 0 || y2 < 0 || y3 < 0 || y4 < 0 ||
x1 > x2 || x2 > x3 || x3 > x4 ||
y1 > 500 || y2 > 500 || y3 > 500 || y4 > 500 )
return FT_THROW( Invalid_Argument );
module->darken_params[0] = x1;
module->darken_params[1] = y1;
module->darken_params[2] = x2;
module->darken_params[3] = y2;
module->darken_params[4] = x3;
module->darken_params[5] = y3;
module->darken_params[6] = x4;
module->darken_params[7] = y4;
return error;
}
else if ( !ft_strcmp( property_name, "no-stem-darkening" ) )
{
FT_Bool* no_stem_darkening = (FT_Bool*)value;
module->no_stem_darkening = *no_stem_darkening;
return error;
}
FT_TRACE0(( "af_property_set: missing property `%s'\n",
property_name ));
@ -253,6 +293,33 @@
return error;
}
#endif /* AF_CONFIG_OPTION_USE_WARPER */
else if ( !ft_strcmp( property_name, "darkening-parameters" ) )
{
FT_Int* darken_params = module->darken_params;
FT_Int* val = (FT_Int*)value;
val[0] = darken_params[0];
val[1] = darken_params[1];
val[2] = darken_params[2];
val[3] = darken_params[3];
val[4] = darken_params[4];
val[5] = darken_params[5];
val[6] = darken_params[6];
val[7] = darken_params[7];
return error;
}
else if ( !ft_strcmp( property_name, "no-stem-darkening" ) )
{
FT_Bool no_stem_darkening = module->no_stem_darkening;
FT_Bool* val = (FT_Bool*)value;
*val = no_stem_darkening;
return error;
}
FT_TRACE0(( "af_property_get: missing property `%s'\n",
property_name ));
@ -304,6 +371,16 @@
#ifdef AF_CONFIG_OPTION_USE_WARPER
module->warping = 0;
#endif
module->no_stem_darkening = FALSE;
module->darken_params[0] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_X1;
module->darken_params[1] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_Y1;
module->darken_params[2] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_X2;
module->darken_params[3] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_Y2;
module->darken_params[4] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_X3;
module->darken_params[5] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_Y3;
module->darken_params[6] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_X4;
module->darken_params[7] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_Y4;
return FT_Err_Ok;
}

2
src/autofit/afmodule.h
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@ -41,6 +41,8 @@ FT_BEGIN_HEADER
#ifdef AF_CONFIG_OPTION_USE_WARPER
FT_Bool warping;
#endif
FT_Bool no_stem_darkening;
FT_Int darken_params[8];
} AF_ModuleRec, *AF_Module;