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Rename ScreenPx to DeviceIndependentPixel.

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This commit is contained in:
Glenn Watson 2017-02-22 14:37:24 +10:00
parent ec5ed8edfd
commit 0af27a3434
9 changed files with 43 additions and 44 deletions
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14
components/geometry/lib.rs
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@ -20,17 +20,17 @@ use std::i32;
/// should approximate a device-independent reference length. This unit corresponds to Android's
/// "density-independent pixel" (dip), Mac OS X's "point", and Windows "device-independent pixel."
///
/// The relationship between DevicePixel and ScreenPx is defined by the OS. On most low-dpi
/// screens, one ScreenPx is equal to one DevicePixel. But on high-density screens it can be
/// some larger number. For example, by default on Apple "retina" displays, one ScreenPx equals
/// two DevicePixels. On Android "MDPI" displays, one ScreenPx equals 1.5 device pixels.
/// The relationship between DevicePixel and DeviceIndependentPixel is defined by the OS. On most low-dpi
/// screens, one DeviceIndependentPixel is equal to one DevicePixel. But on high-density screens it can be
/// some larger number. For example, by default on Apple "retina" displays, one DeviceIndependentPixel equals
/// two DevicePixels. On Android "MDPI" displays, one DeviceIndependentPixel equals 1.5 device pixels.
///
/// The ratio between ScreenPx and DevicePixel for a given display be found by calling
/// The ratio between DeviceIndependentPixel and DevicePixel for a given display be found by calling
/// `servo::windowing::WindowMethods::hidpi_factor`.
#[derive(Clone, Copy, Debug)]
pub enum ScreenPx {}
pub enum DeviceIndependentPixel {}
known_heap_size!(0, ScreenPx);
known_heap_size!(0, DeviceIndependentPixel);
// 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.