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Bug 729528 - Follow-up to fix incorrect calculation. r=Cwiiis

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This commit is contained in:
Kartikaya Gupta 2012-03-27 10:59:38 -04:00
parent 6ea043acbc
commit 8d304ca104
1 changed files with 20 additions and 2 deletions
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22
mobile/android/chrome/content/browser.js
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@ -1611,17 +1611,35 @@ Tab.prototype = {
if (zoom <= 0 || resolution <= 0)
return;
// "zoom" is the user-visible zoom of the "this" tab
// "resolution" is the zoom at which we wish gecko to render "this" tab at
// these two may be different if we are, for example, trying to render a
// large area of the page at low resolution because the user is panning real
// fast.
// The viewport values (aViewportX and aViewportY) correspond to the
// gecko scroll position, and are zoom-multiplied. The display port rect
// values (aDisplayPort), however, is in CSS pixels multiplied by the desired
// rendering resolution. Therefore care must be taken when doing math with
// these sets of values, to ensure that they are normalized to the same coordinate
// space first.
let element = this.browser.contentDocument.documentElement;
if (!element)
return;
// we should never be drawing background tabs at resolutions other than the user-
// visible zoom. for foreground tabs, however, if we are drawing at some other
// resolution, we need to set the resolution as specified.
let cwu = window.top.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
if (BrowserApp.selectedTab == this)
cwu.setResolution(resolution, resolution);
else if (resolution != zoom)
dump("Warning: setDisplayPort resolution did not match zoom for background tab!");
cwu.setDisplayPortForElement((aDisplayPort.left - aViewportX) / resolution,
(aDisplayPort.top - aViewportY) / resolution,
// finally, we set the display port, taking care to convert everything into the CSS-pixel
// coordinate space, because that is what the function accepts.
cwu.setDisplayPortForElement((aDisplayPort.left / resolution) - (aViewportX / zoom),
(aDisplayPort.top / resolution) - (aViewportY / zoom),
(aDisplayPort.right - aDisplayPort.left) / resolution,
(aDisplayPort.bottom - aDisplayPort.top) / resolution,
element);