commit b195514c21e5809f9afc8ec606e716d0e67865cc Author: Kathy Brade brade@pearlcrescent.com Date: Mon Feb 1 14:48:22 2016 -0500

Bug 18144: about:tor update arrow position is wrong (Retina and zoom)

For the about:tor content window, use nsIDOMWindowUtils.screenPixelsPerCSSPixel instead of window.devicePixelRatio to compensate for a retina display and for content zoom (devicePixelRatio always returns 1.0 for content windows due to the fix for bug 13875). --- src/chrome/content/aboutTor/aboutTor.xhtml | 7 +------ src/chrome/content/torbutton.js | 22 +++++++++++++++------- 2 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/src/chrome/content/aboutTor/aboutTor.xhtml b/src/chrome/content/aboutTor/aboutTor.xhtml index 6fdbe50..dbb8a89 100644 --- a/src/chrome/content/aboutTor/aboutTor.xhtml +++ b/src/chrome/content/aboutTor/aboutTor.xhtml @@ -1,6 +1,6 @@ <?xml version="1.0" encoding="UTF-8"?> <!-- - - Copyright (c) 2015, The Tor Project, Inc. + - Copyright (c) 2016, The Tor Project, Inc. - See LICENSE for licensing information. - vim: set sw=2 sts=2 ts=8 et syntax=xml: --> @@ -59,11 +59,6 @@ function adjustToolbarIconArrow() return; }

- // Account for content zoom and retina displays by converting to device - // independent units. - if ("devicePixelRatio" in window) // FF18+ - tbXpos /= window.devicePixelRatio; - const kArrowMargin = 6; // Horizontal margin between line and text. const kArrowHeadExtraWidth = 9; // Horizontal margin to the line. const kArrowLineThickness = 11; diff --git a/src/chrome/content/torbutton.js b/src/chrome/content/torbutton.js index 0d1cfe8..25b61fb 100644 --- a/src/chrome/content/torbutton.js +++ b/src/chrome/content/torbutton.js @@ -1023,7 +1023,8 @@ function torbutton_adjust_abouttor_fontsizes(aDoc, aContainerName) }

// Determine X position of torbutton toolbar item and pass it through -// to the xhtml document. +// to the xhtml document by setting a torbutton-xpos attribute on the body. +// The value that is set takes retina displays and content zoom into account. function torbutton_update_abouttor_arrow(aDoc) { try { let tbXpos = -1; @@ -1033,15 +1034,22 @@ function torbutton_update_abouttor_arrow(aDoc) { let contentElem = document.getElementById("content"); let contentRect = contentElem.getBoundingClientRect(); if (tbItemRect.top < contentRect.top) { - tbXpos = tbItemRect.left + (tbItemRect.width / 2.0) - - contentElem.getBoundingClientRect().left; + tbXpos = tbItemRect.left + (tbItemRect.width / 2.0) - contentRect.left; } } - if (tbXpos >= 0) { - if ("devicePixelRatio" in window) // FF18+ - tbXpos *= window.devicePixelRatio; // Convert to device pixels.

- tbXpos = Math.round(tbXpos); + if (tbXpos >= 0) { + // Convert to device-independent units, compensating for retina display + // and content zoom that may be in effect on the about:tor page. + // Because window.devicePixelRatio always returns 1.0 for non-Chrome + // windows (see bug 13875), we use screenPixelsPerCSSPixel for the + // content window. + tbXpos *= window.devicePixelRatio; + let pixRatio = gBrowser.contentWindow + .QueryInterface(Ci.nsIInterfaceRequestor) + .getInterface(Ci.nsIDOMWindowUtils) + .screenPixelsPerCSSPixel; + tbXpos = Math.round(tbXpos / pixRatio); aDoc.body.setAttribute("torbutton-xpos", tbXpos); } else { aDoc.body.removeAttribute("torbutton-xpos");