Convert the units used in the PaintContext struct to use typed units.

[glennw]

To avoid retina display related bugs.

[mskrzypkows]

I'd like to try this one.

As I understand, I have to change Rect to TypedRect for screen and page:

pub struct PaintContext<'a> {
    pub draw_target: DrawTarget,
    pub font_context: &'a mut Box<FontContext>,
    /// The rectangle that this context encompasses in page coordinates.
    pub page_rect: TypedRect<PagePx, f32>,
    /// The rectangle that this context encompasses in screen coordinates (pixels).
    pub screen_rect: TypedRect<ScreenPx, usize>,
    /// The clipping rect for the stacking context as a whole.
    pub clip_rect: Option<Rect<Au>>,
    /// The current transient clipping region, if any. A "transient clipping region" is the
    /// clipping region used by the last display item. We cache the last value so that we avoid
    /// pushing and popping clipping regions unnecessarily.
    pub transient_clip: Option<ClippingRegion>,
    /// A temporary hack to disable clipping optimizations on 3d layers.
    pub layer_kind: LayerKind,
}

And then convert units. Am I right?

[mbrubeck]

Yes, that's correct.

[mrobinson]

Closing this since PaintContext was removed in fdf9312.