freetype

package module
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 Go to latest Published: May 16, 2015 License: MIT Imports: 6 Imported by: 0

README

go-freetype

Go wrapper for freetype

Build Status

Coverage Status

GoDoc

Work in progress. Code is not tested.

Documentation

Overview

Go wrapper for FreeType which is a freely available software library to render fonts.

Index

Constants

View Source 
const (
	EncodingNone     int = C.FT_ENCODING_NONE
	EncodingMSSymbol int = C.FT_ENCODING_MS_SYMBOL
	EncodingUnicode  int = C.FT_ENCODING_UNICODE
	EncodingSjis     int = C.FT_ENCODING_SJIS
	EncodingGb2312   int = C.FT_ENCODING_GB2312
	EncodingBig5     int = C.FT_ENCODING_BIG5
	EncodingWansung  int = C.FT_ENCODING_WANSUNG
	EncodingJohab    int = C.FT_ENCODING_JOHAB

	/* for backwards compatibility */
	EncodingMSSjis    = EncodingSjis
	EncodingMSGb2312  = EncodingGb2312
	EncodingMSBig5    = EncodingBig5
	EncodingMSWansung = EncodingWansung
	EncodingMSJohab   = EncodingJohab

	EncodingAdobeStandard int = C.FT_ENCODING_ADOBE_STANDARD
	EncodingAdobeExpert   int = C.FT_ENCODING_ADOBE_EXPERT
	EncodingAdobeCustom   int = C.FT_ENCODING_ADOBE_CUSTOM
	EncodingAdobeLatin1   int = C.FT_ENCODING_ADOBE_LATIN_1
	EncodingOldLatin2     int = C.FT_ENCODING_OLD_LATIN_2
	EncodingAppleRoman    int = C.FT_ENCODING_APPLE_ROMAN
)
View Source 
const (
	GlyphBBoxUnscaled  int = C.FT_GLYPH_BBOX_UNSCALED
	GlyphBBoxSubpixels int = C.FT_GLYPH_BBOX_SUBPIXELS
	GlyphBBoxGridfit   int = C.FT_GLYPH_BBOX_GRIDFIT
	GlyphBBoxTruncate  int = C.FT_GLYPH_BBOX_TRUNCATE
	GlyphBBoxPixels    int = C.FT_GLYPH_BBOX_PIXELS
)
View Source 
const (
	GlyphFormatNone      int = C.FT_GLYPH_FORMAT_NONE
	GlyphFormatComposite int = C.FT_GLYPH_FORMAT_COMPOSITE
	GlyphFormatOutline   int = C.FT_GLYPH_FORMAT_OUTLINE
	GlyphFormatPlotter   int = C.FT_GLYPH_FORMAT_PLOTTER
)
View Source 
const (
	LoadDefault                  int = C.FT_LOAD_DEFAULT
	LoadNoScale                  int = C.FT_LOAD_NO_SCALE
	LoadNoHinting                int = C.FT_LOAD_NO_HINTING
	LoadRender                   int = C.FT_LOAD_RENDER
	LoadNoBitmap                 int = C.FT_LOAD_NO_BITMAP
	LoadVerticalLayout           int = C.FT_LOAD_VERTICAL_LAYOUT
	LoadForceAutohint            int = C.FT_LOAD_FORCE_AUTOHINT
	LoadCropBitmap               int = C.FT_LOAD_CROP_BITMAP
	LoadPedantic                 int = C.FT_LOAD_PEDANTIC
	LoadIgnoreGlobalAdvanceWidth int = C.FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH
	LoadNoRecurse                int = C.FT_LOAD_NO_RECURSE
	LoadIgnoreTransform          int = C.FT_LOAD_IGNORE_TRANSFORM
	LoadMonochrome               int = C.FT_LOAD_MONOCHROME
	LoadLinearDesign             int = C.FT_LOAD_LINEAR_DESIGN
	LoadNoAutohint               int = C.FT_LOAD_NO_AUTOHINT
	LoadColor                    int = C.FT_LOAD_COLOR
)
View Source 
const (
	PixelModeNone  int = C.FT_PIXEL_MODE_NONE
	PixelModeMono  int = C.FT_PIXEL_MODE_MONO
	PixelModeGray  int = C.FT_PIXEL_MODE_GRAY
	PixelModeGray2 int = C.FT_PIXEL_MODE_GRAY2
	PixelModeGray4 int = C.FT_PIXEL_MODE_GRAY4
	PixelModeLCD   int = C.FT_PIXEL_MODE_LCD
	PixelModeLCDV  int = C.FT_PIXEL_MODE_LCD_V
	PixelModeBGRA  int = C.FT_PIXEL_MODE_BGRA
	PixelModeMax   int = C.FT_PIXEL_MODE_MAX
)
View Source 
const (
	RasterFlagDefault int = C.FT_RASTER_FLAG_DEFAULT
	RasterFlagAA      int = C.FT_RASTER_FLAG_AA
	RasterFlagDirect  int = C.FT_RASTER_FLAG_DIRECT
	RasterFlagClip    int = C.FT_RASTER_FLAG_CLIP
)
View Source 
const (
	RenderModeNormal int = C.FT_RENDER_MODE_NORMAL
	RenderModeLight  int = C.FT_RENDER_MODE_LIGHT
	RenderModeMono   int = C.FT_RENDER_MODE_MONO
	RenderModeLCD    int = C.FT_RENDER_MODE_LCD
	RenderModeLCDV   int = C.FT_RENDER_MODE_LCD_V
)
View Source 
const (
	StrokerLinejoinRound         int = C.FT_STROKER_LINEJOIN_ROUND
	StrokerLinejoinBevel         int = C.FT_STROKER_LINEJOIN_BEVEL
	StrokerLinejoinMiterVariable int = C.FT_STROKER_LINEJOIN_MITER_VARIABLE
	StrokerLinejoinMiter         int = C.FT_STROKER_LINEJOIN_MITER
	StrokerLinejoinMiterFixed    int = C.FT_STROKER_LINEJOIN_MITER_FIXED

	StrokerLinecapButt   int = C.FT_STROKER_LINECAP_BUTT
	StrokerLinecapRound  int = C.FT_STROKER_LINECAP_ROUND
	StrokerLinecapSquare int = C.FT_STROKER_LINECAP_SQUARE

	StrokerBorderLeft  int = C.FT_STROKER_BORDER_LEFT
	StrokerBorderRight int = C.FT_STROKER_BORDER_RIGHT
)

Variables

View Source 
var (
	// wrapper errors
	ErrUnsupportedPixelMode = errors.New("freetype: unsupported pixel mode")

	// glyph/character errors
	ErrCanNotOpenResource   = errors.New("freetype: cannot open resource")
	ErrUnknownFileFormat    = errors.New("freetype: unknown file format")
	ErrInvalidFileFormat    = errors.New("freetype: broken file")
	ErrInvalidVersion       = errors.New("freetype: invalid FreeType version")
	ErrLowerModuleVersion   = errors.New("freetype: module version is too low")
	ErrInvalidArgument      = errors.New("freetype: invalid argument")
	ErrUnimplementedFeature = errors.New("freetype: unimplemented feature")
	ErrInvalidTable         = errors.New("freetype: broken table")
	ErrInvalidOffset        = errors.New("freetype: broken offset within table")
	ErrArrayTooLarge        = errors.New("freetype: array allocation size too large")
	ErrMissingModule        = errors.New("freetype: missing module")
	ErrMissingProperty      = errors.New("freetype: missing property")

	// glyph/character errors
	ErrInvalidGlyphIndex    = errors.New("freetype: invalid glyph index")
	ErrInvalidCharacterCode = errors.New("freetype: invalid character code")
	ErrInvalidGlyphFormat   = errors.New("freetype: unsupported glyph image format")
	ErrCannotRenderGlyph    = errors.New("freetype: cannot render this glyph format")
	ErrInvalidOutline       = errors.New("freetype: invalid outline")
	ErrInvalidComposite     = errors.New("freetype: invalid composite glyph")
	ErrTooManyHints         = errors.New("freetype: too many hints")
	ErrInvalidPixelSize     = errors.New("freetype: invalid pixel size")

	// handle errors
	ErrInvalidHandle        = errors.New("freetype: invalid object handle")
	ErrInvalidLibraryHandle = errors.New("freetype: invalid library handle")
	ErrInvalidDriverHandle  = errors.New("freetype: invalid module handle")
	ErrInvalidFaceHandle    = errors.New("freetype: invalid face handle")
	ErrInvalidSizeHandle    = errors.New("freetype: invalid size handle")
	ErrInvalidSlotHandle    = errors.New("freetype: invalid glyph slot handle")
	ErrInvalidCharMapHandle = errors.New("freetype: invalid charmap handle")
	ErrCacheHandle          = errors.New("freetype: invalid cache manager handle")
	ErrInvalidStreamHandle  = errors.New("freetype: invalid stream handle")
)

Functions

func GetError 

func GetError(errno C.FT_Error) error

Types

type BBox 

type BBox struct {
	// contains filtered or unexported fields
}

A structure used to hold an outline's bounding box, i.e., the coordinates of its extrema in the horizontal and vertical directions.

func (*BBox) MaxX 

func (b *BBox) MaxX() int64

The horizontal maximum (right-most).

func (*BBox) MaxY 

func (b *BBox) MaxY() int64

The vertical maximum (top-most).

func (*BBox) MinX 

func (b *BBox) MinX() int64

The horizontal minimum (left-most).

func (*BBox) MinY 

func (b *BBox) MinY() int64

The vertical minimum (bottom-most).

type Bitmap 

type Bitmap struct {
	// contains filtered or unexported fields
}

func (*Bitmap) AlphaImage 

func (b *Bitmap) AlphaImage() (*image.Alpha, error)

AlphaImage converts an freetype bitmap of PixelModeGray into an Go image.Alpha. NOTE: Memory is not copied.

func (*Bitmap) Buffer 

func (b *Bitmap) Buffer() []byte

Buffer returns the bitmap buffer.

func (*Bitmap) Done 

func (b *Bitmap) Done(lib *Library) error

func (*Bitmap) GrayImage 

func (b *Bitmap) GrayImage() (*image.Gray, error)

GrayImage returns a gray image. NOTE: Memory is not copied.

func (*Bitmap) Image 

func (b *Bitmap) Image() (image.Image, error)

Image returns an Go image.Image.

func (*Bitmap) NRGBA 

func (b *Bitmap) NRGBA() (*image.NRGBA, error)

NRGBA returns a converted freetype BGRA bitmap. NOTE: Memory is copied.

func (*Bitmap) NumGrays 

func (b *Bitmap) NumGrays() int

This field is only used with PixelModeGray; it gives the number of gray levels used in the bitmap.

func (*Bitmap) Pitch 

func (b *Bitmap) Pitch() int

The pitch's absolute value is the number of bytes taken by one bitmap row, including padding. However, the pitch is positive when the bitmap has a ‘down’ flow, and negative when it has an ‘up’ flow. In all cases, the pitch is an offset to add to a bitmap pointer in order to go down one row.

func (*Bitmap) PixelMode 

func (b *Bitmap) PixelMode() int

The pixel mode, i.e., how pixel bits are stored. See FT_Pixel_Mode for possible values.

func (*Bitmap) Rows 

func (b *Bitmap) Rows() int

The number of bitmap rows.

func (*Bitmap) Width 

func (b *Bitmap) Width() int

The number of pixels in bitmap row.

type BitmapSize 

type BitmapSize struct {
	// contains filtered or unexported fields
}

This structure models the metrics of a bitmap strike (i.e., a set of glyphs for a given point size and resolution) in a bitmap font. It is used for the ‘available_sizes’ field of Face.

func (*BitmapSize) Height 

func (size *BitmapSize) Height() int16

The vertical distance, in pixels, between two consecutive baselines. It is always positive.

func (*BitmapSize) Size 

func (size *BitmapSize) Size() int64

The nominal size of the strike in 26.6 fractional points. This field is not very useful.

func (*BitmapSize) Width 

func (size *BitmapSize) Width() int16

The average width, in pixels, of all glyphs in the strike.

func (*BitmapSize) XPpem 

func (size *BitmapSize) XPpem() int64

The horizontal ppem (nominal width) in 26.6 fractional pixels.

func (*BitmapSize) YPpem 

func (size *BitmapSize) YPpem() int64

The vertical ppem (nominal height) in 26.6 fractional pixels.

type CharMap 

type CharMap struct {
	// contains filtered or unexported fields
}

A handle to a given character map. A charmap is used to translate character codes in a given encoding into glyph indexes for its parent's face. Some font formats may provide several charmaps per font.

func (*CharMap) Encoding 

func (c *CharMap) Encoding() uint64

An Encoding tag identifying the charmap. Use this with Face.SelectCharmap.

func (*CharMap) EncodingID 

func (c *CharMap) EncodingID() uint16

A platform specific encoding number. This also comes from the TrueType specification and should be emulated similarly.

func (*CharMap) Face 

func (c *CharMap) Face() Face

A handle to the parent face object.

func (*CharMap) PlatformID 

func (c *CharMap) PlatformID() uint16

An ID number describing the platform for the following encoding ID. This comes directly from the TrueType specification and should be emulated for other formats.

type Face 

type Face struct {
	// contains filtered or unexported fields
}

func NewFace 

func NewFace(library *Library, filePathName string, faceIndex int64) (*Face, error)

NewFace opens a font by its filePathName.

func NewMemoryFace 

func NewMemoryFace(library *Library, data []byte, faceIndex int64) (*Face, error)

func (*Face) Ascender 

func (f *Face) Ascender() int16

func (*Face) AvailableSizes 

func (f *Face) AvailableSizes() []BitmapSize

func (*Face) BBox 

func (f *Face) BBox() BBox

func (*Face) CharMap 

func (f *Face) CharMap() CharMap

func (*Face) CharMaps 

func (f *Face) CharMaps() []CharMap

func (*Face) Descender 

func (f *Face) Descender() int16

func (*Face) Done 

func (f *Face) Done() error

func (*Face) FaceFlags 

func (f *Face) FaceFlags() int64

func (*Face) FaceIndex 

func (f *Face) FaceIndex() int64

func (*Face) FamilyName 

func (f *Face) FamilyName() string

func (*Face) GetCharIndex 

func (f *Face) GetCharIndex(char uint64) uint

GetCharIndex returns the glyph index of a given character code. This function uses a charmap object to do the mapping.

func (*Face) Glyph 

func (f *Face) Glyph() *GlyphSlot

func (*Face) Height 

func (f *Face) Height() int16

func (*Face) LoadChar 

func (f *Face) LoadChar(char uint64, flags int) error

func (*Face) LoadGlyph 

func (f *Face) LoadGlyph(index uint, flags int) error

func (*Face) MaxAdvanceHeight 

func (f *Face) MaxAdvanceHeight() int16

func (*Face) MaxAdvanceWidth 

func (f *Face) MaxAdvanceWidth() int16

func (*Face) NumCharmaps 

func (f *Face) NumCharmaps() int

func (*Face) NumFaces 

func (f *Face) NumFaces() int64

func (*Face) NumFixedSizes 

func (f *Face) NumFixedSizes() int

func (*Face) SelectCharmap 

func (f *Face) SelectCharmap(encoding int) error

func (*Face) SetCharSize 

func (f *Face) SetCharSize(charWidth, charHeight int64, horzResolution, vertResolution uint) error

func (*Face) SetPixelSizes 

func (f *Face) SetPixelSizes(width, height uint) error

func (*Face) SetTransform 

func (f *Face) SetTransform(matrix *Matrix, delta *Vector)

func (*Face) Size 

func (f *Face) Size() Size

func (*Face) StyleFlags 

func (f *Face) StyleFlags() int64

func (*Face) StyleName 

func (f *Face) StyleName() string

func (*Face) UnderlinePosition 

func (f *Face) UnderlinePosition() int16

func (*Face) UnderlineThickness 

func (f *Face) UnderlineThickness() int16

type Glyph 

type Glyph struct {
	// contains filtered or unexported fields
}

func (*Glyph) Advance 

func (g *Glyph) Advance() *Vector

func (*Glyph) Copy 

func (g *Glyph) Copy() (*Glyph, error)

func (*Glyph) Done 

func (g *Glyph) Done()

func (*Glyph) Format 

func (g *Glyph) Format() int

func (*Glyph) GetCBox 

func (g *Glyph) GetCBox(bboxMode uint) *BBox

func (*Glyph) Library 

func (g *Glyph) Library() *Library

func (*Glyph) ReinterpretAsOutlineGlyph 

func (g *Glyph) ReinterpretAsOutlineGlyph() *OutlineGlyph

func (*Glyph) Stroke 

func (g *Glyph) Stroke(stroker *Stroker, destroy bool) error

Stroke a given outline glyph object with a given stroker.

func (*Glyph) StrokeBorder 

func (g *Glyph) StrokeBorder(stroker *Stroker, inside, destroy bool) error

Stroke a given outline glyph object with a given stroker, but only return either its inside or outside border.

func (*Glyph) ToBitmap 

func (g *Glyph) ToBitmap(renderMode int, origin *Vector, destroy bool) error

func (*Glyph) Transform 

func (g *Glyph) Transform(matrix *Matrix, delta *Vector) error

type GlyphMetrics 

type GlyphMetrics struct {
	// contains filtered or unexported fields
}

func (*GlyphMetrics) Height 

func (m *GlyphMetrics) Height() int64

The glyph's height.

func (*GlyphMetrics) HoriAdvance 

func (m *GlyphMetrics) HoriAdvance() int64

Advance width for horizontal layout.

func (*GlyphMetrics) HoriBearingX 

func (m *GlyphMetrics) HoriBearingX() int64

Left side bearing for horizontal layout.

func (*GlyphMetrics) HoriBearingY 

func (m *GlyphMetrics) HoriBearingY() int64

Top side bearing for horizontal layout.

func (*GlyphMetrics) VertAdvance 

func (m *GlyphMetrics) VertAdvance() int64

Advance height for vertical layout. Positive values mean the glyph has a positive advance downward.

func (*GlyphMetrics) VertBearingX 

func (m *GlyphMetrics) VertBearingX() int64

Left side bearing for vertical layout.

func (*GlyphMetrics) VertBearingY 

func (m *GlyphMetrics) VertBearingY() int64

Top side bearing for vertical layout. Larger positive values mean further below the vertical glyph origin.

func (*GlyphMetrics) Width 

func (m *GlyphMetrics) Width() int64

The glyph's width.

type GlyphSlot 

type GlyphSlot struct {
	// contains filtered or unexported fields
}

func (*GlyphSlot) Advance 

func (g *GlyphSlot) Advance() *Vector

func (*GlyphSlot) Bitmap 

func (g *GlyphSlot) Bitmap() *Bitmap

func (*GlyphSlot) BitmapLeft 

func (g *GlyphSlot) BitmapLeft() int

func (*GlyphSlot) BitmapTop 

func (g *GlyphSlot) BitmapTop() int

func (*GlyphSlot) ControlData 

func (g *GlyphSlot) ControlData() []byte

func (*GlyphSlot) ControlLen 

func (g *GlyphSlot) ControlLen() int

func (*GlyphSlot) Face 

func (g *GlyphSlot) Face() *Face

func (*GlyphSlot) Format 

func (g *GlyphSlot) Format() int

func (*GlyphSlot) GetGlyph 

func (g *GlyphSlot) GetGlyph() (*Glyph, error)

func (*GlyphSlot) Library 

func (g *GlyphSlot) Library() *Library

func (*GlyphSlot) LinearHoriAdvance 

func (g *GlyphSlot) LinearHoriAdvance() int64

func (*GlyphSlot) LinearVertAdvance 

func (g *GlyphSlot) LinearVertAdvance() int64

func (*GlyphSlot) LsbDelta 

func (g *GlyphSlot) LsbDelta() int64

func (*GlyphSlot) Metrices 

func (g *GlyphSlot) Metrices() *GlyphMetrics

func (*GlyphSlot) Next 

func (g *GlyphSlot) Next() *GlyphSlot

func (*GlyphSlot) NumSubGlyphs 

func (g *GlyphSlot) NumSubGlyphs() uint

func (*GlyphSlot) Outline 

func (g *GlyphSlot) Outline() *Outline

func (*GlyphSlot) Render 

func (g *GlyphSlot) Render(mode int) error

functions

func (*GlyphSlot) RsbDelta 

func (g *GlyphSlot) RsbDelta() int64

type Library 

type Library struct {
	// contains filtered or unexported fields
}

A handle to a FreeType library instance. Each ‘library’ is completely independent from the others; it is the ‘root’ of a set of objects like fonts, faces, sizes, etc. In multi-threaded applications, make sure that the same library object or any of its children doesn't get accessed in parallel.

func InitFreeType 

func InitFreeType() (*Library, error)

func (*Library) Done 

func (l *Library) Done() error

type Matrix 

type Matrix struct {
	// contains filtered or unexported fields
}

func NewMatrix 

func NewMatrix() *Matrix

func (*Matrix) SetXX 

func (m *Matrix) SetXX(xx int64)

func (*Matrix) SetXY 

func (m *Matrix) SetXY(xy int64)

func (*Matrix) SetYX 

func (m *Matrix) SetYX(yx int64)

func (*Matrix) SetYY 

func (m *Matrix) SetYY(yy int64)

func (*Matrix) XX 

func (m *Matrix) XX() int64

func (*Matrix) XY 

func (m *Matrix) XY() int64

func (*Matrix) YX 

func (m *Matrix) YX() int64

func (*Matrix) YY 

func (m *Matrix) YY() int64

type Outline 

type Outline struct {
	// contains filtered or unexported fields
}

func (*Outline) Contours 

func (o *Outline) Contours() []int16

the contour end points

func (*Outline) Flags 

func (o *Outline) Flags() int

outline masks

func (*Outline) NumContours 

func (o *Outline) NumContours() int

number of contours in glyph

func (*Outline) NumPoints 

func (o *Outline) NumPoints() int

number of points in the glyph

func (*Outline) Points 

func (o *Outline) Points() []Vector

the outline's points

func (*Outline) Render 

func (o *Outline) Render(library *Library, params *RasterParams) error

func (*Outline) Tags 

func (o *Outline) Tags() []byte

the points flags

type OutlineGlyph 

type OutlineGlyph struct {
	// contains filtered or unexported fields
}

A handle to an object used to model an outline glyph image. This is a sub-class of Glyph, and a pointer to OutlineGlyphRec.

func CastGlyphToOutlineGlyph 

func CastGlyphToOutlineGlyph(glyph *Glyph) *OutlineGlyph

func (*OutlineGlyph) Outline 

func (g *OutlineGlyph) Outline() *Outline

func (*OutlineGlyph) Root 

func (g *OutlineGlyph) Root() *Glyph

type RasterParams 

type RasterParams struct {
	// contains filtered or unexported fields
}

func NewRasterParams 

func NewRasterParams() *RasterParams

func (*RasterParams) ClipBox 

func (params *RasterParams) ClipBox() *BBox

An optional clipping box. It is only used in direct rendering mode. Note that coordinates here should be expressed in integer pixels (and not in 26.6 fixed-point units)

func (*RasterParams) Flags 

func (params *RasterParams) Flags() int

The rendering flags.

func (*RasterParams) GraySpans 

func (params *RasterParams) GraySpans() SpanFunc

func (*RasterParams) SetClipBox 

func (params *RasterParams) SetClipBox(bbox *BBox)

func (*RasterParams) SetFlags 

func (params *RasterParams) SetFlags(flags int)

func (*RasterParams) SetGraySpans 

func (params *RasterParams) SetGraySpans(f SpanFunc)

func (*RasterParams) SetSource 

func (params *RasterParams) SetSource(source *interface{})

func (*RasterParams) SetTarget 

func (params *RasterParams) SetTarget(target *Bitmap)

func (*RasterParams) Source 

func (params *RasterParams) Source() unsafe.Pointer

func (*RasterParams) Target 

func (params *RasterParams) Target() *Bitmap

The target bitmap.

type Size 

type Size struct {
	// contains filtered or unexported fields
}

func (*Size) Face 

func (s *Size) Face() Face

parent face object

func (*Size) Metrics 

func (s *Size) Metrics() SizeMetrics

size metrics

type SizeMetrics 

type SizeMetrics struct {
	// contains filtered or unexported fields
}

func (*SizeMetrics) Ascender 

func (size *SizeMetrics) Ascender() int64

ascender in 26.6 frac. pixels

func (*SizeMetrics) Descender 

func (size *SizeMetrics) Descender() int64

descender in 26.6 frac. pixels

func (*SizeMetrics) Height 

func (size *SizeMetrics) Height() int64

text height in 26.6 frac. pixels

func (*SizeMetrics) MaxAdvance 

func (size *SizeMetrics) MaxAdvance() int64

max horizontal advance, in 26.6 pixels

func (*SizeMetrics) XPpem 

func (size *SizeMetrics) XPpem() int64

horizontal pixels per EM

func (*SizeMetrics) XScale 

func (size *SizeMetrics) XScale() int64

scaling values used to convert font

func (*SizeMetrics) YPpem 

func (size *SizeMetrics) YPpem() int64

vertical pixels per EM

func (*SizeMetrics) YScale 

func (size *SizeMetrics) YScale() int64

units to 26.6 fractional pixels

type Span 

type Span struct {
	// contains filtered or unexported fields
}

func (*Span) Coverage 

func (s *Span) Coverage() byte

func (*Span) Len 

func (s *Span) Len() uint16

func (*Span) X 

func (s *Span) X() int16

type SpanFunc 

type SpanFunc func(y, count int, spans []Span)

type Stroker 

type Stroker struct {
	// contains filtered or unexported fields
}

func NewStroker 

func NewStroker(library *Library) (*Stroker, error)

func (*Stroker) BeginSubPath 

func (s *Stroker) BeginSubPath(to Vector, open bool) error

Start a new sub-path in the stroker.

func (*Stroker) ConicTo 

func (s *Stroker) ConicTo(control, to *Vector) error

‘Draw’ a single quadratic Bézier in the stroker's current sub-path, from the last position.

func (*Stroker) CubicTo 

func (s *Stroker) CubicTo(control1, control2, to *Vector) error

‘Draw’ a single cubic Bézier in the stroker's current sub-path, from the last position.

func (*Stroker) Done 

func (s *Stroker) Done()

Destroy stroker object.

func (*Stroker) EndSubPath 

func (s *Stroker) EndSubPath() error

Close the current sub-path in the stroker.

func (*Stroker) Export 

func (s *Stroker) Export(outline *Outline)

Call this function after Stroker.GetBorderCounts to export all borders to your own Outline structure.

Note that this function appends the border points and contours to your outline, 

but does not try to resize its arrays.

func (*Stroker) ExportBorder 

func (s *Stroker) ExportBorder(border int, outline *Outline)

Call this function after Stroker.GetBorderCounts to export the corresponding border to your own Outline structure.

Note that this function appends the border points and contours to your outline, but does not try to resize its arrays.

func (*Stroker) GetBorderCounts 

func (s *Stroker) GetBorderCounts(border int) (uint, uint, error)

Call this function once you have finished parsing your paths with the stroker. It returns the number of points and contours necessary to export one of the ‘border’ or ‘stroke’ outlines generated by the stroker.

func (*Stroker) GetCounts 

func (s *Stroker) GetCounts() (uint, uint, error)

Call this function once you have finished parsing your paths with the stroker. It returns the number of points and contours necessary to export all points/borders from the stroked outline/path.

func (*Stroker) LineTo 

func (s *Stroker) LineTo(to *Vector) error

‘Draw’ a single line segment in the stroker's current sub-path, from the last position.

func (*Stroker) ParseOutline 

func (s *Stroker) ParseOutline(outline *Outline, opened bool) error

A convenience function used to parse a whole outline with the stroker. The resulting outline(s) can be retrieved later by functions 

like Stroker.GetCounts and Stroker.Export.

func (*Stroker) Rewind 

func (s *Stroker) Rewind()

Reset a stroker object without changing its attributes. You should call this function before beginning 

a new series of calls to Stroker.BeginSubPath or Stroker.EndSubPath.

func (*Stroker) Set 

func (s *Stroker) Set(radius int64, lineCap, lineJoin int, miterLimit int64)

Set resets the attributes.

type Vector 

type Vector struct {
	// contains filtered or unexported fields
}

func NewVector 

func NewVector() *Vector

func (*Vector) SetX 

func (v *Vector) SetX(x int64)

func (*Vector) SetY 

func (v *Vector) SetY(y int64)

func (*Vector) X 

func (v *Vector) X() int64

func (*Vector) Y 

func (v *Vector) Y() int64

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