1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
// Helper file for shared image functionality
//
// Note that this is use by tests elsewhere in the source tree. When in doubt,
// check mxr before removing or changing functionality.
// Helper function to clear both the content and chrome image caches
function clearAllImageCaches()
{
var tools = SpecialPowers.Cc["@mozilla.org/image/tools;1"]
.getService(SpecialPowers.Ci.imgITools);
var imageCache = tools.getImgCacheForDocument(window.document);
imageCache.clearCache(true); // true=chrome
imageCache.clearCache(false); // false=content
}
// Helper function to clear the image cache of content images
function clearImageCache()
{
var tools = SpecialPowers.Cc["@mozilla.org/image/tools;1"]
.getService(SpecialPowers.Ci.imgITools);
var imageCache = tools.getImgCacheForDocument(window.document);
imageCache.clearCache(false); // true=chrome, false=content
}
// Helper function to determine if the frame is decoded for a given image id
function isFrameDecoded(id)
{
return (getImageStatus(id) &
SpecialPowers.Ci.imgIRequest.STATUS_FRAME_COMPLETE)
? true : false;
}
// Helper function to determine if the image is loaded for a given image id
function isImageLoaded(id)
{
return (getImageStatus(id) &
SpecialPowers.Ci.imgIRequest.STATUS_LOAD_COMPLETE)
? true : false;
}
// Helper function to get the status flags of an image
function getImageStatus(id)
{
// Get the image
var img = SpecialPowers.wrap(document.getElementById(id));
// QI the image to nsImageLoadingContent
img.QueryInterface(SpecialPowers.Ci.nsIImageLoadingContent);
// Get the request
var request = img.getRequest(SpecialPowers.Ci
.nsIImageLoadingContent
.CURRENT_REQUEST);
// Return the status
return request.imageStatus;
}
// Forces a synchronous decode of an image by drawing it to a canvas. Only
// really meaningful if the image is fully loaded first
function forceDecode(id)
{
// Get the image
var img = document.getElementById(id);
// Make a new canvas
var canvas = document.createElement("canvas");
// Draw the image to the canvas. This forces a synchronous decode
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0);
}
// Functions to facilitate getting/setting various image-related prefs
//
// If you change a pref in a mochitest, Don't forget to reset it to its
// original value!
//
// Null indicates no pref set
const DISCARD_ENABLED_PREF = {name: "discardable", branch: "image.mem.", type: "bool"};
const DECODEONDRAW_ENABLED_PREF = {name: "decodeondraw", branch: "image.mem.", type: "bool"};
const DISCARD_TIMEOUT_PREF = {name: "min_discard_timeout_ms", branch: "image.mem.", type: "int"};
function setImagePref(pref, val)
{
var prefService = SpecialPowers.Cc["@mozilla.org/preferences-service;1"]
.getService(SpecialPowers.Ci.nsIPrefService);
var branch = prefService.getBranch(pref.branch);
if (val != null) {
switch(pref.type) {
case "bool":
branch.setBoolPref(pref.name, val);
break;
case "int":
branch.setIntPref(pref.name, val);
break;
default:
throw new Error("Unknown pref type");
}
}
else if (branch.prefHasUserValue(pref.name))
branch.clearUserPref(pref.name);
}
function getImagePref(pref)
{
var prefService = SpecialPowers.Cc["@mozilla.org/preferences-service;1"]
.getService(SpecialPowers.Ci.nsIPrefService);
var branch = prefService.getBranch(pref.branch);
if (branch.prefHasUserValue(pref.name)) {
switch (pref.type) {
case "bool":
return branch.getBoolPref(pref.name);
case "int":
return branch.getIntPref(pref.name);
default:
throw new Error("Unknown pref type");
}
}
else
return null;
}
// JS implementation of imgIScriptedNotificationObserver with stubs for all of its methods.
function ImageDecoderObserverStub()
{
this.sizeAvailable = function sizeAvailable(aRequest) {}
this.frameComplete = function frameComplete(aRequest) {}
this.decodeComplete = function decodeComplete(aRequest) {}
this.loadComplete = function loadComplete(aRequest) {}
this.frameUpdate = function frameUpdate(aRequest) {}
this.discard = function discard(aRequest) {}
this.isAnimated = function isAnimated(aRequest) {}
this.hasTransparency = function hasTransparency(aRequest) {}
}
|
