Pdf.Content.Processor

Process content stream operators maintaining graphics state

It is pretty experimental

Documentation

data Processor

Processor maintains graphics state

Constructors

Processor

Fields

• prState :: GraphicsState
• prStateStack :: [GraphicsState]
• prGlyphDecoder :: GlyphDecoder
• prSpans :: [Span]

  Each element is a list of glyphs, drawn in one shot

data GraphicsState

Graphics state

Constructors

GraphicsState

Fields

• gsInText :: Bool

  Indicates that we are inside text object

• gsCurrentTransformMatrix :: Transform Double
• gsFont :: Maybe Name
• gsFontSize :: Maybe Double
• gsTextMatrix :: Transform Double

  Defined only inside text object

• gsTextLineMatrix :: Transform Double

  Defined only inside text object

• gsTextLeading :: Double
• gsTextCharSpacing :: Double
• gsTextWordSpacing :: Double

Instances

Show GraphicsState

Defined in Pdf.Content.Processor

Methods

showsPrec :: Int -> GraphicsState -> ShowS

show :: GraphicsState -> String

showList :: [GraphicsState] -> ShowS

type GlyphDecoder = Name -> ByteString -> [(Glyph, Double)]

Given font name and string, it should return list of glyphs and their widths.

Note: it should not try to position or scale glyphs to user space, bounding boxes should be defined in glyph space.

Note: glyph width is a distance between the glyph's origin and the next glyph's origin, so it generally can't be calculated from bounding box

Note: the Processor actually doesn't cares about glyph's bounding box, so you can return anything you want

data Glyph

Glyph

Constructors

Glyph

Fields

• glyphCode :: Int

  The code as read from content stream

• glyphTopLeft :: Vector Double

  Top-left corner of glyph's bounding box

• glyphBottomRight :: Vector Double

  Bottom-right corner of glyph's bounding box

• glyphText :: Maybe Text

  Text ectracted from the glyph

Instances

Show Glyph

Defined in Pdf.Content.Processor

Methods

showsPrec :: Int -> Glyph -> ShowS

show :: Glyph -> String

showList :: [Glyph] -> ShowS

data Span

Glyphs drawn in one shot

Constructors

Span

Fields

• spGlyphs :: [Glyph]
• spFontName :: Name

initialGraphicsState :: GraphicsState

Empty graphics state

mkProcessor :: Processor

Create processor in initial state

processOp :: Operator -> Processor -> Either String Processor

Process one operation