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Move some unit type definitions to style_traits.

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Ms2ger 2016-07-07 11:55:53 +02:00
parent 42e90f7db9
commit cbfe77cee1
16 changed files with 42 additions and 45 deletions
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30
components/util/geometry.rs
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@ -26,35 +26,7 @@ use std::i32;
#[derive(Clone, Copy, Debug)]
pub enum ScreenPx {}
/// 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 ScreenPx 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 ScreenPx. 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 {}
known_heap_size!(0, ScreenPx, ViewportPx, PagePx);
// In summary, the hierarchy of pixel units and the factors to convert from one to the next:
//
// DevicePixel
// / hidpi_ratio => ScreenPx
// / desktop_zoom => ViewportPx
// / pinch_zoom => PagePx
known_heap_size!(0, ScreenPx);
// An Au is an "App Unit" and represents 1/60th of a CSS pixel. It was
// originally proposed in 2002 as a standard unit of measure in Gecko.