bitmap

Documentation

Overview

Pacakge bitmap provides support for bitmap fonts found in .pcf files.

Index

• Constants
• func Load(file fonts.Resource) (fonts.Faces, error)
• func ScanFont(file fonts.Resource) ([]fonts.FontDescriptor, error)
• type Atom
• type Font
  • func Parse(file fonts.Resource) (*Font, error)
  • func (f *Font) Cmap() (fonts.Cmap, fonts.CmapEncoding)
  • func (f *Font) FontHExtents() (fonts.FontExtents, bool)
  • func (f *Font) FontVExtents() (fonts.FontExtents, bool)
  • func (f *Font) GetAdvance(index gid) (int32, error)
  • func (f *Font) GetBDFProperty(s string) Property
  • func (f *Font) GlyphData(gid fonts.GID, xPpem, yPpem uint16) fonts.GlyphData
  • func (f *Font) GlyphExtents(gid fonts.GID, _, _ uint16) (fonts.GlyphExtents, bool)
  • func (f *Font) GlyphHOrigin(fonts.GID) (x, y int32, found bool)
  • func (f *Font) GlyphName(gid fonts.GID) string
  • func (f *Font) GlyphVOrigin(gid fonts.GID) (x, y int32, found bool)
  • func (f *Font) HorizontalAdvance(gid fonts.GID) float32
  • func (Font) LineMetric(fonts.LineMetric) (float32, bool)
  • func (f *Font) LoadBitmaps() []fonts.BitmapSize
  • func (f *Font) LoadMetrics() fonts.FaceMetrics
  • func (f *Font) LoadSummary() (fonts.FontSummary, error)
  • func (f *Font) NominalGlyph(r rune) (fonts.GID, bool)
  • func (f *Font) PoscriptName() string
  • func (f *Font) PostscriptInfo() (fonts.PSInfo, bool)
  • func (Font) Upem() uint16
  • func (f *Font) VerticalAdvance(gid fonts.GID) float32
• type Int
• type Property

Constants

const (
	COMPRESSED_METRICS = 0x00000100
)

Functions

func Load

func Load(file fonts.Resource) (fonts.Faces, error)

Load implements fonts.FontLoader. When the error is `nil`, one (and only one) font is returned.

func ScanFont

func ScanFont(file fonts.Resource) ([]fonts.FontDescriptor, error)

ScanFont lazily parse `file` to extract the information about the font. If no error occurs, the returned slice has always length 1.

Types

type Atom

type Atom string

type Font

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

func Parse

func Parse(file fonts.Resource) (*Font, error)

Parse parse a .pcf font file.

func (*Font) Cmap

func (f *Font) Cmap() (fonts.Cmap, fonts.CmapEncoding)

read the charset properties and build the cmap only unicode charmap is supported

func (*Font) FontHExtents

func (f *Font) FontHExtents() (fonts.FontExtents, bool)

func (*Font) FontVExtents

func (f *Font) FontVExtents() (fonts.FontExtents, bool)

func (*Font) GetAdvance

func (f *Font) GetAdvance(index gid) (int32, error)

func (*Font) GetBDFProperty

func (f *Font) GetBDFProperty(s string) Property

GetBDFProperty return a property from a bitmap font, or nil if it is not found.

func (*Font) GlyphData

func (f *Font) GlyphData(gid fonts.GID, xPpem, yPpem uint16) fonts.GlyphData

func (*Font) GlyphExtents

func (f *Font) GlyphExtents(gid fonts.GID, _, _ uint16) (fonts.GlyphExtents, bool)

GlyphExtents retrieve the extents for a specified glyph, of false, if not available. `coords` is used by variable fonts, and is specified in normalized coordinates. For bitmap glyphs, the closest resolution to `xPpem` and `yPpem` is selected.

func (*Font) GlyphHOrigin

func (f *Font) GlyphHOrigin(fonts.GID) (x, y int32, found bool)

GlyphHOrigin fetches the (X,Y) coordinates of the origin (in font units) for a glyph ID, for horizontal text segments. Returns `false` if not available.

func (*Font) GlyphName

func (f *Font) GlyphName(gid fonts.GID) string

func (*Font) GlyphVOrigin

func (f *Font) GlyphVOrigin(gid fonts.GID) (x, y int32, found bool)

GlyphVOrigin is the same as `GlyphHOrigin`, but for vertical text segments.

func (*Font) HorizontalAdvance

func (f *Font) HorizontalAdvance(gid fonts.GID) float32

func (Font) LineMetric

func (Font) LineMetric(fonts.LineMetric) (float32, bool)

func (*Font) LoadBitmaps

func (f *Font) LoadBitmaps() []fonts.BitmapSize

LoadBitmaps always returns a one element slice.

func (*Font) LoadMetrics

func (f *Font) LoadMetrics() fonts.FaceMetrics

LoadMetrics returns the font object itself.

func (*Font) LoadSummary

func (f *Font) LoadSummary() (fonts.FontSummary, error)

func (*Font) NominalGlyph

func (f *Font) NominalGlyph(r rune) (fonts.GID, bool)

func (*Font) PoscriptName

func (f *Font) PoscriptName() string

func (*Font) PostscriptInfo

func (f *Font) PostscriptInfo() (fonts.PSInfo, bool)

func (Font) Upem

func (Font) Upem() uint16

func (*Font) VerticalAdvance

func (f *Font) VerticalAdvance(gid fonts.GID) float32

type Int

type Int int32

type Property

type Property interface {
	// contains filtered or unexported methods
}

Property is either an `Atom` or an `Int`