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Move some unit type definitions to style_traits.
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16 changed files with 42 additions and 45 deletions
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@ -26,35 +26,7 @@ use std::i32;
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#[derive(Clone, Copy, Debug)]
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pub enum ScreenPx {}
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/// One CSS "px" in the coordinate system of the "initial viewport":
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/// http://www.w3.org/TR/css-device-adapt/#initial-viewport
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///
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/// ViewportPx is equal to ScreenPx times a "page zoom" factor controlled by the user. This is
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/// the desktop-style "full page" zoom that enlarges content but then reflows the layout viewport
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/// so it still exactly fits the visible area.
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///
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/// At the default zoom level of 100%, one PagePx is equal to one ScreenPx. However, if the
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/// document is zoomed in or out then this scale may be larger or smaller.
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#[derive(Clone, Copy, Debug)]
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pub enum ViewportPx {}
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/// One CSS "px" in the root coordinate system for the content document.
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///
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/// PagePx is equal to ViewportPx multiplied by a "viewport zoom" factor controlled by the user.
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/// This is the mobile-style "pinch zoom" that enlarges content without reflowing it. When the
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/// viewport zoom is not equal to 1.0, then the layout viewport is no longer the same physical size
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/// as the viewable area.
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#[derive(Clone, Copy, Debug)]
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pub enum PagePx {}
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known_heap_size!(0, ScreenPx, ViewportPx, PagePx);
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// In summary, the hierarchy of pixel units and the factors to convert from one to the next:
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//
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// DevicePixel
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// / hidpi_ratio => ScreenPx
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// / desktop_zoom => ViewportPx
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// / pinch_zoom => PagePx
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known_heap_size!(0, ScreenPx);
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// An Au is an "App Unit" and represents 1/60th of a CSS pixel. It was
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// originally proposed in 2002 as a standard unit of measure in Gecko.
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