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comparison: image/test/unit/image_load_helpers.js
image/test/unit/image_load_helpers.js
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
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| -1:000000000000 | 0:a710db7622f7 |
|---|---|
| 1 /* | |
| 2 * Helper structures to track callbacks from image and channel loads. | |
| 3 */ | |
| 4 | |
| 5 // START_REQUEST and STOP_REQUEST are used by ChannelListener, and | |
| 6 // stored in ChannelListener.requestStatus. | |
| 7 const START_REQUEST = 0x01; | |
| 8 const STOP_REQUEST = 0x02; | |
| 9 const DATA_AVAILABLE = 0x04; | |
| 10 | |
| 11 // One bit per callback that imageListener below implements. Stored in | |
| 12 // ImageListener.state. | |
| 13 const SIZE_AVAILABLE = 0x01; | |
| 14 const FRAME_UPDATE = 0x02; | |
| 15 const FRAME_COMPLETE = 0x04; | |
| 16 const LOAD_COMPLETE = 0x08; | |
| 17 const DECODE_COMPLETE = 0x10; | |
| 18 | |
| 19 // An implementation of imgIScriptedNotificationObserver with the ability to | |
| 20 // call specified functions on onStartRequest and onStopRequest. | |
| 21 function ImageListener(start_callback, stop_callback) | |
| 22 { | |
| 23 this.sizeAvailable = function onSizeAvailable(aRequest) | |
| 24 { | |
| 25 do_check_false(this.synchronous); | |
| 26 | |
| 27 this.state |= SIZE_AVAILABLE; | |
| 28 | |
| 29 if (this.start_callback) | |
| 30 this.start_callback(this, aRequest); | |
| 31 } | |
| 32 this.frameComplete = function onFrameComplete(aRequest) | |
| 33 { | |
| 34 do_check_false(this.synchronous); | |
| 35 | |
| 36 this.state |= FRAME_COMPLETE; | |
| 37 } | |
| 38 this.decodeComplete = function onDecodeComplete(aRequest) | |
| 39 { | |
| 40 do_check_false(this.synchronous); | |
| 41 | |
| 42 this.state |= DECODE_COMPLETE; | |
| 43 } | |
| 44 this.loadComplete = function onLoadcomplete(aRequest) | |
| 45 { | |
| 46 do_check_false(this.synchronous); | |
| 47 | |
| 48 try { | |
| 49 aRequest.requestDecode(); | |
| 50 } catch (e) { | |
| 51 do_print("requestDecode threw " + e); | |
| 52 } | |
| 53 | |
| 54 this.state |= LOAD_COMPLETE; | |
| 55 | |
| 56 if (this.stop_callback) | |
| 57 this.stop_callback(this, aRequest); | |
| 58 } | |
| 59 this.frameUpdate = function onFrameUpdate(aRequest) | |
| 60 { | |
| 61 } | |
| 62 this.isAnimated = function onIsAnimated() | |
| 63 { | |
| 64 } | |
| 65 | |
| 66 // Initialize the synchronous flag to true to start. This must be set to | |
| 67 // false before exiting to the event loop! | |
| 68 this.synchronous = true; | |
| 69 | |
| 70 // A function to call when onStartRequest is called. | |
| 71 this.start_callback = start_callback; | |
| 72 | |
| 73 // A function to call when onStopRequest is called. | |
| 74 this.stop_callback = stop_callback; | |
| 75 | |
| 76 // The image load/decode state. | |
| 77 // A bitfield that tracks which callbacks have been called. Takes the bits | |
| 78 // defined above. | |
| 79 this.state = 0; | |
| 80 } | |
| 81 | |
| 82 function NS_FAILED(val) | |
| 83 { | |
| 84 return !!(val & 0x80000000); | |
| 85 } | |
| 86 | |
| 87 function ChannelListener() | |
| 88 { | |
| 89 this.onStartRequest = function onStartRequest(aRequest, aContext) | |
| 90 { | |
| 91 if (this.outputListener) | |
| 92 this.outputListener.onStartRequest(aRequest, aContext); | |
| 93 | |
| 94 this.requestStatus |= START_REQUEST; | |
| 95 } | |
| 96 | |
| 97 this.onDataAvailable = function onDataAvailable(aRequest, aContext, aInputStream, aOffset, aCount) | |
| 98 { | |
| 99 if (this.outputListener) | |
| 100 this.outputListener.onDataAvailable(aRequest, aContext, aInputStream, aOffset, aCount); | |
| 101 | |
| 102 this.requestStatus |= DATA_AVAILABLE; | |
| 103 } | |
| 104 | |
| 105 this.onStopRequest = function onStopRequest(aRequest, aContext, aStatusCode) | |
| 106 { | |
| 107 if (this.outputListener) | |
| 108 this.outputListener.onStopRequest(aRequest, aContext, aStatusCode); | |
| 109 | |
| 110 // If we failed (or were canceled - failure is implied if canceled), | |
| 111 // there's no use tracking our state, since it's meaningless. | |
| 112 if (NS_FAILED(aStatusCode)) | |
| 113 this.requestStatus = 0; | |
| 114 else | |
| 115 this.requestStatus |= STOP_REQUEST; | |
| 116 } | |
| 117 | |
| 118 // A listener to pass the notifications we get to. | |
| 119 this.outputListener = null; | |
| 120 | |
| 121 // The request's status. A bitfield that holds one or both of START_REQUEST | |
| 122 // and STOP_REQUEST, according to which callbacks have been called on the | |
| 123 // associated request. | |
| 124 this.requestStatus = 0; | |
| 125 } |
