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102 lines
3.3 KiB
JavaScript
102 lines
3.3 KiB
JavaScript
// Helper file for shared image functionality
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//
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// Note that this is use by tests elsewhere in the source tree. When in doubt,
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// check mxr before removing or changing functionality.
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// Helper function to clear the image cache of content images
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function clearImageCache()
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{
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netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
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var imageCache = Components.classes["@mozilla.org/image/cache;1"]
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.getService(Components.interfaces.imgICache);
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imageCache.clearCache(false); // true=chrome, false=content
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}
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// Helper function to determine if the frame is decoded for a given image id
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function isFrameDecoded(id)
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{
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return (getImageStatus(id) &
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Components.interfaces.imgIRequest.STATUS_FRAME_COMPLETE)
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? true : false;
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}
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// Helper function to determine if the image is loaded for a given image id
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function isImageLoaded(id)
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{
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return (getImageStatus(id) &
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Components.interfaces.imgIRequest.STATUS_LOAD_COMPLETE)
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? true : false;
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}
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// Helper function to get the status flags of an image
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function getImageStatus(id)
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{
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// Escalate
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netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
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// Get the image
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var img = document.getElementById(id);
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// QI the image to nsImageLoadingContent
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img.QueryInterface(Components.interfaces.nsIImageLoadingContent);
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// Get the request
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var request = img.getRequest(Components.interfaces
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.nsIImageLoadingContent
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.CURRENT_REQUEST);
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// Return the status
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return request.imageStatus;
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}
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// Forces a synchronous decode of an image by drawing it to a canvas. Only
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// really meaningful if the image is fully loaded first
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function forceDecode(id)
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{
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netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
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// Get the image
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var img = document.getElementById(id);
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// Make a new canvas
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var canvas = document.createElement("canvas");
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// Draw the image to the canvas. This forces a synchronous decode
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var ctx = canvas.getContext("2d");
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ctx.drawImage(img, 0, 0);
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}
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// Functions to facilitate getting/setting the discard timer pref
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//
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// Don't forget to reset the pref to the original value!
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//
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// Null indicates no pref set
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const DISCARD_BRANCH_NAME = "image.cache.";
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const DISCARD_PREF_NAME = "discard_timer_ms";
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function setDiscardTimerPref(timeMS)
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{
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netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
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var prefService = Components.classes["@mozilla.org/preferences-service;1"]
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.getService(Components.interfaces.nsIPrefService);
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var branch = prefService.getBranch(DISCARD_BRANCH_NAME);
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if (timeMS != null)
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branch.setIntPref(DISCARD_PREF_NAME, timeMS);
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else if (branch.prefHasUserValue(DISCARD_PREF_NAME))
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branch.clearUserPref(DISCARD_PREF_NAME);
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}
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function getDiscardTimerPref()
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{
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netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
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var prefService = Components.classes["@mozilla.org/preferences-service;1"]
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.getService(Components.interfaces.nsIPrefService);
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var branch = prefService.getBranch(DISCARD_BRANCH_NAME);
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if (branch.prefHasUserValue(DISCARD_PREF_NAME))
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return branch.getIntPref("discard_timeout_ms");
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else
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return null;
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}
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