FreeType-2.8 API Reference

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This section contains routines used to create and destroy scalable glyph images known as ‘outlines’. These can also be measured, transformed, and converted into bitmaps and pixmaps.

FT_Outline	FT_Outline_Get_Bitmap
FT_Outline_New	FT_Outline_Render
FT_Outline_Done	FT_Outline_Decompose
FT_Outline_Copy	FT_Outline_Funcs
FT_Outline_Translate	FT_Outline_MoveToFunc
FT_Outline_Transform	FT_Outline_LineToFunc
FT_Outline_Embolden	FT_Outline_ConicToFunc
FT_Outline_EmboldenXY	FT_Outline_CubicToFunc
FT_Outline_Reverse
FT_Outline_Check	FT_Orientation
	FT_Outline_Get_Orientation
FT_Outline_Get_CBox
FT_Outline_Get_BBox	FT_OUTLINE_XXX

n_contours	The number of contours in the outline.
n_points	The number of points in the outline.
points	A pointer to an array of ‘n_points’ FT_Vector 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’ 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 ‘0’ to ‘contours[0]’, the second one is defined by the points ‘contours[0]+1’ to ‘contours[1]’, etc.
flags	A set of bit flags used to characterize the outline and give hints to the scan-converter and hinter on how to convert/grid-fit it. See FT_OUTLINE_XXX.

library	A handle to the library object from where the outline is allocated. Note however that the new outline will not necessarily be freed, when destroying the library, by FT_Done_FreeType.
numPoints	The maximum number of points within the outline. Must be smaller than or equal to 0xFFFF (65535).
numContours	The maximum number of contours within the outline. This value must be in the range 0 to ‘numPoints’.

library	A handle of the library object used to allocate the outline.
outline	A pointer to the outline object to be discarded.

xOffset	The horizontal offset.
yOffset	The vertical offset.

library	A handle to a FreeType library object.
outline	A pointer to the source outline descriptor.

outline	A pointer to the source target.
func_interface	A table of ‘emitters’, i.e., function pointers called during decomposition to indicate path operations.

move_to	The ‘move to’ emitter.
line_to	The segment emitter.
conic_to	The second-order Bézier arc emitter.
cubic_to	The third-order Bézier arc emitter.
shift	The shift that is applied to coordinates before they are sent to the emitter.
delta	The delta that is applied to coordinates before they are sent to the emitter, but after the shift.

to	A pointer to the target point of the ‘move to’.
user	A typeless pointer, which is passed from the caller of the decomposition function.

to	A pointer to the target point of the ‘line to’.
user	A typeless pointer, which is passed from the caller of the decomposition function.

control	An intermediate control point between the last position and the new target in ‘to’.
to	A pointer to the target end point of the conic arc.
user	A typeless pointer, which is passed from the caller of the decomposition function.

control1	A pointer to the first Bézier control point.
control2	A pointer to the second Bézier control point.
to	A pointer to the target end point.
user	A typeless pointer, which is passed from the caller of the decomposition function.

FT_ORIENTATION_TRUETYPE	According to the TrueType specification, clockwise contours must be filled, and counter-clockwise ones must be unfilled.
FT_ORIENTATION_POSTSCRIPT	According to the PostScript specification, counter-clockwise contours must be filled, and clockwise ones must be unfilled.
FT_ORIENTATION_FILL_RIGHT	This is identical to FT_ORIENTATION_TRUETYPE, but is used to remember that in TrueType, everything that is to the right of the drawing direction of a contour must be filled.
FT_ORIENTATION_FILL_LEFT	This is identical to FT_ORIENTATION_POSTSCRIPT, but is used to remember that in PostScript, everything that is to the left of the drawing direction of a contour must be filled.
FT_ORIENTATION_NONE	The orientation cannot be determined. That is, different parts of the glyph have different orientation.

FT_OUTLINE_NONE	Value 0 is reserved.
FT_OUTLINE_OWNER	If set, this flag indicates that the outline's field arrays (i.e., ‘points’, ‘flags’, and ‘contours’) are ‘owned’ by the outline object, and should thus be freed when it is destroyed.
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 rasterizer).
FT_OUTLINE_REVERSE_FILL	By default, outside contours of an outline are oriented in clock-wise direction, as defined in the TrueType specification. This flag is set if the outline uses the opposite direction (typically for Type 1 fonts). This flag is ignored by the scan converter.
FT_OUTLINE_IGNORE_DROPOUTS	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. 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. 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. See below for more information.
FT_OUTLINE_HIGH_PRECISION	This flag indicates that the scan-line converter should try to convert this outline to bitmaps with the highest possible quality. It is typically set for small character sizes. Note that this is only a hint that might be completely ignored by a given scan-converter.
FT_OUTLINE_SINGLE_PASS	This flag is set to force a given scan-converter to only use a single pass over the outline to render a bitmap glyph image. Normally, it is set for very large character sizes. It is only a hint that might be completely ignored by a given scan-converter.

FreeType-2.8 API Reference

Outline Processing

Synopsis

FT_Outline

fields

note

FT_Outline_New

input

output

return

note

FT_Outline_Done

input

return

note

FT_Outline_Copy

input

output

return

FT_Outline_Translate

inout

input

FT_Outline_Transform

inout

input

note

FT_Outline_Embolden

inout

input

return

note

FT_Outline_EmboldenXY

FT_Outline_Reverse

inout

note

FT_Outline_Check

input

return

note

FT_Outline_Get_CBox

input

output

note

FT_Outline_Get_BBox

input

output

return

note

FT_Outline_Get_Bitmap

input

inout

return

note

FT_Outline_Render

input

inout

return

note

FT_Outline_Decompose

input

inout

return

note

FT_Outline_Funcs

fields

note

FT_Outline_MoveToFunc

input

return

FT_Outline_LineToFunc

input

return

FT_Outline_ConicToFunc

input

return

FT_Outline_CubicToFunc

input

return

FT_Orientation

values