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Bug 814864 - Respect layers.low-precision-buffer in Fennec browser.js. r=kats

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When layers.low-precision-buffer is false, just set the display port and not
the critical display port.
This commit is contained in:
Chris Lord 2012-11-29 13:08:41 +00:00
parent c18df4638e
commit f131070a78
1 changed files with 27 additions and 18 deletions
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45
mobile/android/chrome/content/browser.js
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@ -284,6 +284,9 @@ var BrowserApp = {
if (updated)
this.onAppUpdated();
// Store the low-precision buffer pref
this.gUseLowPrecision = Services.prefs.getBoolPref("layers.low-precision-buffer");
// notify java that gecko has loaded
sendMessageToJava({
gecko: {
@ -2760,26 +2763,32 @@ Tab.prototype = {
Math.abs(displayPort.y - this._oldDisplayPort.y) > epsilon ||
Math.abs(displayPort.width - this._oldDisplayPort.width) > epsilon ||
Math.abs(displayPort.height - this._oldDisplayPort.height) > epsilon) {
// Set the display-port to be 4x the size of the critical display-port,
// on each dimension, giving us a 0.25x lower precision buffer around the
// critical display-port. Spare area is *not* redistributed to the other
// axis, as display-list building and invalidation cost scales with the
// size of the display-port.
let pageRect = cwu.getRootBounds();
let pageXMost = pageRect.right - geckoScrollX;
let pageYMost = pageRect.bottom - geckoScrollY;
if (BrowserApp.gUseLowPrecision) {
// Set the display-port to be 4x the size of the critical display-port,
// on each dimension, giving us a 0.25x lower precision buffer around the
// critical display-port. Spare area is *not* redistributed to the other
// axis, as display-list building and invalidation cost scales with the
// size of the display-port.
let pageRect = cwu.getRootBounds();
let pageXMost = pageRect.right - geckoScrollX;
let pageYMost = pageRect.bottom - geckoScrollY;
let dpW = Math.min(pageRect.right - pageRect.left, displayPort.width * 4);
let dpH = Math.min(pageRect.bottom - pageRect.top, displayPort.height * 4);
let dpW = Math.min(pageRect.right - pageRect.left, displayPort.width * 4);
let dpH = Math.min(pageRect.bottom - pageRect.top, displayPort.height * 4);
let dpX = Math.min(Math.max(displayPort.x - displayPort.width * 1.5,
pageRect.left - geckoScrollX), pageXMost - dpW);
let dpY = Math.min(Math.max(displayPort.y - displayPort.height * 1.5,
pageRect.top - geckoScrollY), pageYMost - dpH);
cwu.setDisplayPortForElement(dpX, dpY, dpW, dpH, element);
cwu.setCriticalDisplayPortForElement(displayPort.x, displayPort.y,
displayPort.width, displayPort.height,
element);
let dpX = Math.min(Math.max(displayPort.x - displayPort.width * 1.5,
pageRect.left - geckoScrollX), pageXMost - dpW);
let dpY = Math.min(Math.max(displayPort.y - displayPort.height * 1.5,
pageRect.top - geckoScrollY), pageYMost - dpH);
cwu.setDisplayPortForElement(dpX, dpY, dpW, dpH, element);
cwu.setCriticalDisplayPortForElement(displayPort.x, displayPort.y,
displayPort.width, displayPort.height,
element);
} else {
cwu.setDisplayPortForElement(displayPort.x, displayPort.y,
displayPort.width, displayPort.height,
element);
}
}
this._oldDisplayPort = displayPort;