Changes between Version 8 and Version 9 of ScalesAndZooms

Timestamp:

Jan 8, 2013 2:29:02 AM (11 years ago)

Author:

mnaganov@chromium.org

Comment:

Logical pixels -> DIP pixels, see ​https://bugs.webkit.org/show_bug.cgi?id=106021

ScalesAndZooms

@@ -11 +11 @@
 
  * CSS pixel - the unit '1px' in CSS, basis of most other CSS units of length.  Also known as a layout pixel.  Represented in WebCore by the LayoutUnit type.
- * Logical pixel - also known sometimes as "UI pixel" or "device-independent pixel".
+ * DIP pixel - a Density Independent Pixel, also known sometimes as "UI pixel".
  * Physical pixel - represents one unit of display on the physical display.  Also known as device-dependent pixel.
  * CSS viewport - dimensions of the CSS initial containing block, in CSS pixels.
- * Virtual viewport - visible region of the screen when using zoom gestures, measured in logical pixels.
+ * Virtual viewport - visible region of the screen when using zoom gestures, measured in DIP pixels.
 
 = Types of scales and zooms =
@@ -21 +21 @@
 
 || '''Name''' || '''Ratio''' || '''Changes CSS viewport size''' || '''Exposed directly to web content''' ||
-|| Device Scale || Physical pixel : Logical pixel || No || Yes - window.devicePixelRatio, CSS media queries ||
-|| Page scale || Logical pixel : CSS pixel || No || No ||
-|| Page zoom || Logical pixel : CSS pixel || Yes || No ||
+|| Device Scale || Physical pixel : DIP pixel || No || Yes - window.devicePixelRatio, CSS media queries ||
+|| Page scale || DIP pixel : CSS pixel || No || No ||
+|| Page zoom || DIP pixel : CSS pixel || Yes || No ||
 || Text zoom || Specified font size : Actual font size || No || No ||
 || CSS/SVG scale transform || Local coordinate space || No || Yes ||
@@ -34 +34 @@
 
 == Page zoom ==
-Page zoom is used to implement browser zoom functionality present in many desktop browsers.  A page zoom factor of 120% means that one CSS pixel occupies 1.2 logical/UI pixels.  Changing the page zoom factor typically does not change the logical size of the viewport, meaning that with a page zoom greater than one the viewport is effectively smaller in terms of CSS pixels.  Because of this, changing the page zoom factor typically changes the layout of a page significantly.
+Page zoom is used to implement browser zoom functionality present in many desktop browsers.  A page zoom factor of 120% means that one CSS pixel occupies 1.2 DIP pixels.  Changing the page zoom factor typically does not change the logical size of the viewport, meaning that with a page zoom greater than one the viewport is effectively smaller in terms of CSS pixels.  Because of this, changing the page zoom factor typically changes the layout of a page significantly.
 
 == Text zoom ==