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Introduce CSSPixel as a replacement for ViewportPx and PagePx.

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Glenn Watson 2017-02-23 14:16:29 +10:00
parent 56a99577b3
commit 30ff2f8f0d
16 changed files with 81 additions and 92 deletions
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36
components/style_traits/lib.rs
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@ -26,33 +26,41 @@ extern crate rustc_serialize;
/// Must be transmutable to and from `TNode`.
pub type UnsafeNode = (usize, usize);
/// Represents a mobile style pinch zoom factor.
/// TODO(gw): Once WR supports pinch zoom, use a type directly from webrender_traits.
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize, HeapSizeOf))]
pub struct PinchZoomFactor(f32);
impl PinchZoomFactor {
/// Construct a new pinch zoom factor.
pub fn new(scale: f32) -> PinchZoomFactor {
PinchZoomFactor(scale)
}
/// Get the pinch zoom factor as an untyped float.
pub fn get(&self) -> f32 {
self.0
}
}
/// One CSS "px" in the coordinate system of the "initial viewport":
/// http://www.w3.org/TR/css-device-adapt/#initial-viewport
///
/// `ViewportPx` is equal to `DeviceIndependentPixel` times a "page zoom" factor controlled by the user. This is
/// `CSSPixel` is equal to `DeviceIndependentPixel` times a "page zoom" factor controlled by the user. This is
/// the desktop-style "full page" zoom that enlarges content but then reflows the layout viewport
/// so it still exactly fits the visible area.
///
/// At the default zoom level of 100%, one `PagePx` is equal to one `DeviceIndependentPixel`. However, if the
/// At the default zoom level of 100%, one `CSSPixel` is equal to one `DeviceIndependentPixel`. However, if the
/// document is zoomed in or out then this scale may be larger or smaller.
#[derive(Clone, Copy, Debug)]
pub enum ViewportPx {}
/// One CSS "px" in the root coordinate system for the content document.
///
/// `PagePx` is equal to `ViewportPx` multiplied by a "viewport zoom" factor controlled by the user.
/// This is the mobile-style "pinch zoom" that enlarges content without reflowing it. When the
/// viewport zoom is not equal to 1.0, then the layout viewport is no longer the same physical size
/// as the viewable area.
#[derive(Clone, Copy, Debug)]
pub enum PagePx {}
pub enum CSSPixel {}
// In summary, the hierarchy of pixel units and the factors to convert from one to the next:
//
// DevicePixel
// / hidpi_ratio => DeviceIndependentPixel
// / desktop_zoom => ViewportPx
// / pinch_zoom => PagePx
// / desktop_zoom => CSSPixel
pub mod cursor;
#[macro_use]