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Fontconfig options for freetype sub-pixel filter configuration 

David Turner has modified FreeType to be able to render sub-pixel decimated
glyphs using different methods of filtering. Fontconfig needs new
configurables to support selecting these new filtering options. A patch
follows that would correspond to one available for Cairo in bug 10301.
This commit is contained in:
Sylvain Pasche 2008-05-03 19:33:45 -07:00 committed by Keith Packard
parent c26344ecfc
commit 53aec11107
5 changed files with 22 additions and 3 deletions
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1
doc/fontconfig-devel.sgml
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@ -177,6 +177,7 @@ convenience for the applications rendering mechanism.
dpi FC_DPI Double Target dots per inch dpi FC_DPI Double Target dots per inch
rgba FC_RGBA Int unknown, rgb, bgr, vrgb, rgba FC_RGBA Int unknown, rgb, bgr, vrgb,
vbgr, none - subpixel geometry vbgr, none - subpixel geometry
lcdfilter FC_LCD_FILTER Int Type of LCD filter
minspace FC_MINSPACE Bool Eliminate leading from line minspace FC_MINSPACE Bool Eliminate leading from line
spacing spacing
charset FC_CHARSET CharSet Unicode chars encoded by charset FC_CHARSET CharSet Unicode chars encoded by

5
doc/fontconfig-user.sgml
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@ -120,6 +120,7 @@ convenience for the applications' rendering mechanism.
dpi Double Target dots per inch dpi Double Target dots per inch
rgba Int unknown, rgb, bgr, vrgb, vbgr, rgba Int unknown, rgb, bgr, vrgb, vbgr,
none - subpixel geometry none - subpixel geometry
lcdfilter Int Type of LCD filter
minspace Bool Eliminate leading from line spacing minspace Bool Eliminate leading from line spacing
charset CharSet Unicode chars encoded by the font charset CharSet Unicode chars encoded by the font
lang String List of RFC-3066-style languages this lang String List of RFC-3066-style languages this
@ -476,6 +477,10 @@ symbolic names for common font values:
vrgb rgba 3 vrgb rgba 3
vbgr rgba 4 vbgr rgba 4
none rgba 5 none rgba 5
lcdnone lcdfilter 0
lcddefault lcdfilter 1
lcdlight lcdfilter 2
lcdlegacy lcdfilter 3
hintnone hintstyle 0 hintnone hintstyle 0
hintslight hintstyle 1 hintslight hintstyle 1
hintmedium hintstyle 2 hintmedium hintstyle 2

7
fontconfig/fontconfig.h
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@ -111,6 +111,7 @@ typedef int FcBool;
#define FC_EMBOLDEN "embolden" /* Bool - true if emboldening needed*/ #define FC_EMBOLDEN "embolden" /* Bool - true if emboldening needed*/
#define FC_EMBEDDED_BITMAP "embeddedbitmap" /* Bool - true to enable embedded bitmaps */ #define FC_EMBEDDED_BITMAP "embeddedbitmap" /* Bool - true to enable embedded bitmaps */
#define FC_DECORATIVE "decorative" /* Bool - true if style is a decorative variant */ #define FC_DECORATIVE "decorative" /* Bool - true if style is a decorative variant */
#define FC_LCD_FILTER "lcdfilter" /* Int */
#define FC_CACHE_SUFFIX ".cache-"FC_CACHE_VERSION #define FC_CACHE_SUFFIX ".cache-"FC_CACHE_VERSION
#define FC_DIR_CACHE_FILE "fonts.cache-"FC_CACHE_VERSION #define FC_DIR_CACHE_FILE "fonts.cache-"FC_CACHE_VERSION
@ -172,6 +173,12 @@ typedef int FcBool;
#define FC_HINT_MEDIUM 2 #define FC_HINT_MEDIUM 2
#define FC_HINT_FULL 3 #define FC_HINT_FULL 3
/* LCD filter */
#define FC_LCD_NONE 0
#define FC_LCD_DEFAULT 1
#define FC_LCD_LIGHT 2
#define FC_LCD_LEGACY 3
typedef enum _FcType { typedef enum _FcType {
FcTypeVoid, FcTypeVoid,
FcTypeInteger, FcTypeInteger,

3
src/fcint.h
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@ -848,7 +848,8 @@ FcListPatternMatchAny (const FcPattern *p,
#define FC_EMBOLDEN_OBJECT 38 #define FC_EMBOLDEN_OBJECT 38
#define FC_EMBEDDED_BITMAP_OBJECT 39 #define FC_EMBEDDED_BITMAP_OBJECT 39
#define FC_DECORATIVE_OBJECT 40 #define FC_DECORATIVE_OBJECT 40
#define FC_MAX_BASE_OBJECT FC_DECORATIVE_OBJECT #define FC_LCD_FILTER_OBJECT 41
#define FC_MAX_BASE_OBJECT FC_LCD_FILTER_OBJECT
FcPrivate FcBool FcPrivate FcBool
FcNameBool (const FcChar8 *v, FcBool *result); FcNameBool (const FcChar8 *v, FcBool *result);

7
src/fcname.c
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@ -74,7 +74,8 @@ static const FcObjectType _FcBaseObjectTypes[] = {
{ FC_FONTFORMAT, FcTypeString }, { FC_FONTFORMAT, FcTypeString },
{ FC_EMBOLDEN, FcTypeBool }, { FC_EMBOLDEN, FcTypeBool },
{ FC_EMBEDDED_BITMAP, FcTypeBool }, { FC_EMBEDDED_BITMAP, FcTypeBool },
{ FC_DECORATIVE, FcTypeBool }, /* 40 */ { FC_DECORATIVE, FcTypeBool },
{ FC_LCD_FILTER, FcTypeInteger }, /* 41 */
}; };
#define NUM_OBJECT_TYPES (sizeof _FcBaseObjectTypes / sizeof _FcBaseObjectTypes[0]) #define NUM_OBJECT_TYPES (sizeof _FcBaseObjectTypes / sizeof _FcBaseObjectTypes[0])
@ -435,6 +436,10 @@ static const FcConstant _FcBaseConstants[] = {
{ (FcChar8 *) "embolden", "embolden", FcTrue }, { (FcChar8 *) "embolden", "embolden", FcTrue },
{ (FcChar8 *) "embeddedbitmap", "embeddedbitmap", FcTrue }, { (FcChar8 *) "embeddedbitmap", "embeddedbitmap", FcTrue },
{ (FcChar8 *) "decorative", "decorative", FcTrue }, { (FcChar8 *) "decorative", "decorative", FcTrue },
{ (FcChar8 *) "lcdnone", "lcdfilter", FC_LCD_NONE },
{ (FcChar8 *) "lcddefault", "lcdfilter", FC_LCD_DEFAULT },
{ (FcChar8 *) "lcdlight", "lcdfilter", FC_LCD_LIGHT },
{ (FcChar8 *) "lcdlegacy", "lcdfilter", FC_LCD_LEGACY },
}; };
#define NUM_FC_CONSTANTS (sizeof _FcBaseConstants/sizeof _FcBaseConstants[0]) #define NUM_FC_CONSTANTS (sizeof _FcBaseConstants/sizeof _FcBaseConstants[0])