diff options
Diffstat (limited to 'freetype/include/freetype/ftimage.h')
| -rw-r--r-- | freetype/include/freetype/ftimage.h | 65 |
1 files changed, 48 insertions, 17 deletions
diff --git a/freetype/include/freetype/ftimage.h b/freetype/include/freetype/ftimage.h index ccc2f7135..2fcc113ad 100644 --- a/freetype/include/freetype/ftimage.h +++ b/freetype/include/freetype/ftimage.h @@ -5,7 +5,7 @@ /* FreeType glyph image formats and default raster interface */ /* (specification). */ /* */ -/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by */ +/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ @@ -318,14 +318,23 @@ FT_BEGIN_HEADER /* elements, giving the outline's point coordinates. */ /* */ /* tags :: A pointer to an array of `n_points' chars, giving */ - /* each outline point's type. If bit~0 is unset, the */ - /* point is `off' the curve, i.e., a Bézier control */ - /* point, while it is `on' when set. */ + /* each outline point's type. */ + /* */ + /* If bit~0 is unset, the point is `off' the curve, */ + /* i.e., a Bézier control point, while it is `on' if */ + /* set. */ /* */ /* Bit~1 is meaningful for `off' points only. If set, */ /* it indicates a third-order Bézier arc control point; */ /* and a second-order control point if unset. */ /* */ + /* If bit~2 is set, bits 5-7 contain the drop-out mode */ + /* (as defined in the OpenType specification; the value */ + /* is the same as the argument to the SCANMODE */ + /* instruction). */ + /* */ + /* Bits 3 and~4 are reserved for internal purposes. */ + /* */ /* contours :: An array of `n_contours' shorts, giving the end */ /* point of each contour within the outline. For */ /* example, the first contour is defined by the points */ @@ -336,6 +345,12 @@ FT_BEGIN_HEADER /* and give hints to the scan-converter and hinter on */ /* how to convert/grid-fit it. See @FT_OUTLINE_FLAGS. */ /* */ + /* <Note> */ + /* The B/W rasterizer only checks bit~2 in the `tags' array for the */ + /* first point of each contour. The drop-out mode as given with */ + /* @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, and */ + /* @FT_OUTLINE_INCLUDE_STUBS in `flags' is then overridden. */ + /* */ typedef struct FT_Outline_ { short n_contours; /* number of contours in glyph */ @@ -349,6 +364,11 @@ FT_BEGIN_HEADER } FT_Outline; + /* Following limits must be consistent with */ + /* FT_Outline.{n_contours,n_points} */ +#define FT_OUTLINE_CONTOURS_MAX SHRT_MAX +#define FT_OUTLINE_POINTS_MAX SHRT_MAX + /*************************************************************************/ /* */ @@ -371,7 +391,7 @@ FT_BEGIN_HEADER /* FT_OUTLINE_EVEN_ODD_FILL :: */ /* By default, outlines are filled using the non-zero winding rule. */ /* If set to 1, the outline will be filled using the even-odd fill */ - /* rule (only works with the smooth raster). */ + /* rule (only works with the smooth rasterizer). */ /* */ /* FT_OUTLINE_REVERSE_FILL :: */ /* By default, outside contours of an outline are oriented in */ @@ -384,15 +404,17 @@ FT_BEGIN_HEADER /* By default, the scan converter will try to detect drop-outs in */ /* an outline and correct the glyph bitmap to ensure consistent */ /* shape continuity. If set, this flag hints the scan-line */ - /* converter to ignore such cases. */ + /* converter to ignore such cases. See below for more information. */ /* */ /* FT_OUTLINE_SMART_DROPOUTS :: */ /* Select smart dropout control. If unset, use simple dropout */ - /* control. Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. */ + /* control. Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See */ + /* below for more information. */ /* */ /* FT_OUTLINE_INCLUDE_STUBS :: */ /* If set, turn pixels on for `stubs', otherwise exclude them. */ - /* Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. */ + /* Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See below for */ + /* more information. */ /* */ /* FT_OUTLINE_HIGH_PRECISION :: */ /* This flag indicates that the scan-line converter should try to */ @@ -409,6 +431,13 @@ FT_BEGIN_HEADER /* scan-converter. */ /* */ /* <Note> */ + /* The flags @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, */ + /* and @FT_OUTLINE_INCLUDE_STUBS are ignored by the smooth */ + /* rasterizer. */ + /* */ + /* There exists a second mechanism to pass the drop-out mode to the */ + /* B/W rasterizer; see the `tags' field in @FT_Outline. */ + /* */ /* Please refer to the description of the `SCANTYPE' instruction in */ /* the OpenType specification (in file `ttinst1.doc') how simple */ /* drop-outs, smart drop-outs, and stubs are defined. */ @@ -455,15 +484,17 @@ FT_BEGIN_HEADER #define FT_CURVE_TAG( flag ) ( flag & 3 ) -#define FT_CURVE_TAG_ON 1 -#define FT_CURVE_TAG_CONIC 0 -#define FT_CURVE_TAG_CUBIC 2 +#define FT_CURVE_TAG_ON 1 +#define FT_CURVE_TAG_CONIC 0 +#define FT_CURVE_TAG_CUBIC 2 + +#define FT_CURVE_TAG_HAS_SCANMODE 4 -#define FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */ -#define FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */ +#define FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */ +#define FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */ -#define FT_CURVE_TAG_TOUCH_BOTH ( FT_CURVE_TAG_TOUCH_X | \ - FT_CURVE_TAG_TOUCH_Y ) +#define FT_CURVE_TAG_TOUCH_BOTH ( FT_CURVE_TAG_TOUCH_X | \ + FT_CURVE_TAG_TOUCH_Y ) #define FT_Curve_Tag_On FT_CURVE_TAG_ON #define FT_Curve_Tag_Conic FT_CURVE_TAG_CONIC @@ -1011,7 +1042,7 @@ FT_BEGIN_HEADER /* */ /* gray_spans :: The gray span drawing callback. */ /* */ - /* black_spans :: The black span drawing callback. */ + /* black_spans :: The black span drawing callback. UNIMPLEMENTED! */ /* */ /* bit_test :: The bit test callback. UNIMPLEMENTED! */ /* */ @@ -1048,7 +1079,7 @@ FT_BEGIN_HEADER const void* source; int flags; FT_SpanFunc gray_spans; - FT_SpanFunc black_spans; + FT_SpanFunc black_spans; /* doesn't work! */ FT_Raster_BitTest_Func bit_test; /* doesn't work! */ FT_Raster_BitSet_Func bit_set; /* doesn't work! */ void* user; |