One purpose of creating an explicit Graphics.Rendering.Pango.Font.FontMap is to set a different scaling factor between font sizes (in points, pt) and Cairo units (in pixels). The default is 96dpi (dots per inch) which corresponds to an average screen as output medium. A 10pt font will therefore scale to 10pt * (1/72 pt/inch) * (96 pixel/inch) = 13.3 pixel.

cairoFontMapSetResolution :: FontMap -> Double -> IO ()

Set the scaling factor between font size and Cairo units.

Value is in dots per inch (dpi). See cairoFontMapGetDefault.

cairoFontMapGetResolution :: FontMap -> IO Double

Ask for the scaling factor between font size and Cairo units.

Value is in dots per inch (dpi). See cairoFontMapGetDefault.

cairoCreateContext :: Maybe FontMap -> IO PangoContext

Create a PangoContext.

If no FontMap is specified, it uses the default FontMap that has a scaling factor of 96 dpi. See cairoFontMapGetDefault.

cairoContextSetResolution :: PangoContext -> Double -> IO ()

Set the scaling factor of the PangoContext.

Supplying zero or a negative value will result in the resolution value of the underlying FontMap to be used. See also cairoFontMapGetDefault.

cairoContextGetResolution :: PangoContext -> IO Double

Ask for the scaling factor of the PangoContext.

A negative value will be returned if no resolution has been set. See cairoContextSetResolution.

cairoContextSetFontOptions :: PangoContext -> FontOptions -> IO ()

Set Cairo font options.

Apply the given font options to the context. Values set through this functions override those that are set by updateContext.

cairoContextGetFontOptions :: PangoContext -> IO FontOptions

Retrieve Cairo font options.

Functions for the `Render` monad.

renderWithDrawable Source

Arguments

:: DrawableClass drawable
=> drawable	`drawable` - a `Drawable`
-> Render a	A newly created Cairo context.
-> IO a

Creates a Cairo context for drawing to a Drawable.

setSourceColor :: Color -> Render ()

Sets the specified Color as the source color of the Render context.

setSourcePixbuf Source

Arguments

:: Pixbuf
-> Double	x
-> Double	y
-> Render ()

Sets the given pixbuf as the source pattern for the Cairo context. The pattern has an extend mode of ExtendNone and is aligned so that the origin of pixbuf is (x, y).

region :: Region -> Render ()Source

Adds the given region to the current path of the Render context.

updateContext :: PangoContext -> Render ()

Update a PangoContext with respect to changes in a Render environment.

The PangoContext must have been created with cairoCreateContext. Any PangoLayouts that have been previously created with this context have to be update using Graphics.Rendering.Pango.Layout.layoutContextChanged.

createLayout :: String -> Render PangoLayout

Create a PangoLayout within a Render context.

This is a convenience function that creates a new PangoContext within this Render context and creates a new PangoLayout. If the transformation or target surface of the Render context change, updateLayout has to be called on this layout.

updateLayout :: PangoLayout -> Render ()

Propagate changed to the Render context to a PangoLayout.

This is a convenience function that calls updateContext on the (private) PangoContext of the given layout to propagate changes from the Render context to the PangoContext and then calls Graphics.Rendering.Pango.Layout.layoutContextChanged on the layout. This function is necessary for createLayout since a private PangoContext is created that is not visible to the user.

showGlyphString :: GlyphItem -> Render ()

Draw a glyph string.