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comparison: image/test/mochitest/imgutils.js
image/test/mochitest/imgutils.js
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| 1 /* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 // Helper file for shared image functionality | |
| 3 // | |
| 4 // Note that this is use by tests elsewhere in the source tree. When in doubt, | |
| 5 // check mxr before removing or changing functionality. | |
| 6 | |
| 7 // Helper function to clear the image cache of content images | |
| 8 function clearImageCache() | |
| 9 { | |
| 10 var tools = SpecialPowers.Cc["@mozilla.org/image/tools;1"] | |
| 11 .getService(SpecialPowers.Ci.imgITools); | |
| 12 var imageCache = tools.getImgCacheForDocument(window.document); | |
| 13 imageCache.clearCache(false); // true=chrome, false=content | |
| 14 } | |
| 15 | |
| 16 // Helper function to determine if the frame is decoded for a given image id | |
| 17 function isFrameDecoded(id) | |
| 18 { | |
| 19 return (getImageStatus(id) & | |
| 20 SpecialPowers.Ci.imgIRequest.STATUS_FRAME_COMPLETE) | |
| 21 ? true : false; | |
| 22 } | |
| 23 | |
| 24 // Helper function to determine if the image is loaded for a given image id | |
| 25 function isImageLoaded(id) | |
| 26 { | |
| 27 return (getImageStatus(id) & | |
| 28 SpecialPowers.Ci.imgIRequest.STATUS_LOAD_COMPLETE) | |
| 29 ? true : false; | |
| 30 } | |
| 31 | |
| 32 // Helper function to get the status flags of an image | |
| 33 function getImageStatus(id) | |
| 34 { | |
| 35 // Get the image | |
| 36 var img = SpecialPowers.wrap(document.getElementById(id)); | |
| 37 | |
| 38 // QI the image to nsImageLoadingContent | |
| 39 img.QueryInterface(SpecialPowers.Ci.nsIImageLoadingContent); | |
| 40 | |
| 41 // Get the request | |
| 42 var request = img.getRequest(SpecialPowers.Ci | |
| 43 .nsIImageLoadingContent | |
| 44 .CURRENT_REQUEST); | |
| 45 | |
| 46 // Return the status | |
| 47 return request.imageStatus; | |
| 48 } | |
| 49 | |
| 50 // Forces a synchronous decode of an image by drawing it to a canvas. Only | |
| 51 // really meaningful if the image is fully loaded first | |
| 52 function forceDecode(id) | |
| 53 { | |
| 54 // Get the image | |
| 55 var img = document.getElementById(id); | |
| 56 | |
| 57 // Make a new canvas | |
| 58 var canvas = document.createElement("canvas"); | |
| 59 | |
| 60 // Draw the image to the canvas. This forces a synchronous decode | |
| 61 var ctx = canvas.getContext("2d"); | |
| 62 ctx.drawImage(img, 0, 0); | |
| 63 } | |
| 64 | |
| 65 | |
| 66 // Functions to facilitate getting/setting various image-related prefs | |
| 67 // | |
| 68 // If you change a pref in a mochitest, Don't forget to reset it to its | |
| 69 // original value! | |
| 70 // | |
| 71 // Null indicates no pref set | |
| 72 | |
| 73 const DISCARD_ENABLED_PREF = {name: "discardable", branch: "image.mem.", type: "bool"}; | |
| 74 const DECODEONDRAW_ENABLED_PREF = {name: "decodeondraw", branch: "image.mem.", type: "bool"}; | |
| 75 const DISCARD_TIMEOUT_PREF = {name: "min_discard_timeout_ms", branch: "image.mem.", type: "int"}; | |
| 76 | |
| 77 function setImagePref(pref, val) | |
| 78 { | |
| 79 var prefService = SpecialPowers.Cc["@mozilla.org/preferences-service;1"] | |
| 80 .getService(SpecialPowers.Ci.nsIPrefService); | |
| 81 var branch = prefService.getBranch(pref.branch); | |
| 82 if (val != null) { | |
| 83 switch(pref.type) { | |
| 84 case "bool": | |
| 85 branch.setBoolPref(pref.name, val); | |
| 86 break; | |
| 87 case "int": | |
| 88 branch.setIntPref(pref.name, val); | |
| 89 break; | |
| 90 default: | |
| 91 throw new Error("Unknown pref type"); | |
| 92 } | |
| 93 } | |
| 94 else if (branch.prefHasUserValue(pref.name)) | |
| 95 branch.clearUserPref(pref.name); | |
| 96 } | |
| 97 | |
| 98 function getImagePref(pref) | |
| 99 { | |
| 100 var prefService = SpecialPowers.Cc["@mozilla.org/preferences-service;1"] | |
| 101 .getService(SpecialPowers.Ci.nsIPrefService); | |
| 102 var branch = prefService.getBranch(pref.branch); | |
| 103 if (branch.prefHasUserValue(pref.name)) { | |
| 104 switch (pref.type) { | |
| 105 case "bool": | |
| 106 return branch.getBoolPref(pref.name); | |
| 107 case "int": | |
| 108 return branch.getIntPref(pref.name); | |
| 109 default: | |
| 110 throw new Error("Unknown pref type"); | |
| 111 } | |
| 112 } | |
| 113 else | |
| 114 return null; | |
| 115 } | |
| 116 | |
| 117 // JS implementation of imgIScriptedNotificationObserver with stubs for all of its methods. | |
| 118 function ImageDecoderObserverStub() | |
| 119 { | |
| 120 this.sizeAvailable = function sizeAvailable(aRequest) {} | |
| 121 this.frameComplete = function frameComplete(aRequest) {} | |
| 122 this.decodeComplete = function decodeComplete(aRequest) {} | |
| 123 this.loadComplete = function loadComplete(aRequest) {} | |
| 124 this.frameUpdate = function frameUpdate(aRequest) {} | |
| 125 this.discard = function discard(aRequest) {} | |
| 126 this.isAnimated = function isAnimated(aRequest) {} | |
| 127 } |
