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Bug 720838 - [Page Thumbnails] Use canvas.mozFetchAsStream(); r=dietrich

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This commit is contained in:
Tim Taubert 2012-02-09 09:48:30 +01:00
parent c2c6c894d0
commit d07a3bd328
3 changed files with 42 additions and 56 deletions
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5
browser/base/content/browser-thumbnails.js
View File

@ -78,8 +78,9 @@ let gBrowserThumbnails = {
_capture: function Thumbnails_capture(aBrowser) {
if (this._shouldCapture(aBrowser)) {
let canvas = this._pageThumbs.capture(aBrowser.contentWindow);
this._pageThumbs.store(aBrowser.currentURI.spec, canvas);
this._pageThumbs.capture(aBrowser.contentWindow, function (aInputStream) {
this._pageThumbs.store(aBrowser.currentURI.spec, aInputStream);
}.bind(this));
}
},

53
browser/components/thumbnails/PageThumbs.jsm
View File

@ -72,11 +72,13 @@ let PageThumbs = {
},
/**
* Creates a canvas containing a thumbnail depicting the given window.
* Captures a thumbnail for the given window.
* @param aWindow The DOM window to capture a thumbnail from.
* @return The newly created canvas containing the image data.
* @param aCallback The function to be called when the thumbnail has been
* captured. The first argument will be the data stream
* containing the image data.
*/
capture: function PageThumbs_capture(aWindow) {
capture: function PageThumbs_capture(aWindow, aCallback) {
let telemetryCaptureTime = new Date();
let [sw, sh, scale] = this._determineCropSize(aWindow);
@ -94,21 +96,22 @@ let PageThumbs = {
// We couldn't draw to the canvas for some reason.
}
Services.telemetry.getHistogramById("FX_THUMBNAILS_CAPTURE_TIME_MS")
let telemetry = Services.telemetry;
telemetry.getHistogramById("FX_THUMBNAILS_CAPTURE_TIME_MS")
.add(new Date() - telemetryCaptureTime);
return canvas;
canvas.mozFetchAsStream(aCallback, this.contentType);
},
/**
* Stores the image data contained in the given canvas to the underlying
* storage.
* @param aKey The key to use for the storage.
* @param aCanvas The canvas containing the thumbnail's image data.
* @param aInputStream The input stream containing the image data.
* @param aCallback The function to be called when the canvas data has been
* stored (optional).
*/
store: function PageThumbs_store(aKey, aCanvas, aCallback) {
store: function PageThumbs_store(aKey, aInputStream, aCallback) {
let telemetryStoreTime = new Date();
function finish(aSuccessful) {
@ -121,8 +124,6 @@ let PageThumbs = {
aCallback(aSuccessful);
}
let self = this;
// Get a writeable cache entry.
PageThumbsCache.getWriteEntry(aKey, function (aEntry) {
if (!aEntry) {
@ -130,38 +131,20 @@ let PageThumbs = {
return;
}
// Extract image data from the canvas.
self._readImageData(aCanvas, function (aData) {
let outputStream = aEntry.openOutputStream(0);
let outputStream = aEntry.openOutputStream(0);
// Write the image data to the cache entry.
NetUtil.asyncCopy(aData, outputStream, function (aResult) {
let success = Components.isSuccessCode(aResult);
if (success)
aEntry.markValid();
// Write the image data to the cache entry.
NetUtil.asyncCopy(aInputStream, outputStream, function (aResult) {
let success = Components.isSuccessCode(aResult);
if (success)
aEntry.markValid();
aEntry.close();
finish(success);
});
aEntry.close();
finish(success);
});
});
},
/**
* Reads the image data from a given canvas and passes it to the callback.
* @param aCanvas The canvas to read the image data from.
* @param aCallback The function that the image data is passed to.
*/
_readImageData: function PageThumbs_readImageData(aCanvas, aCallback) {
let dataUri = aCanvas.toDataURL(PageThumbs.contentType, "");
let uri = Services.io.newURI(dataUri, "UTF8", null);
NetUtil.asyncFetch(uri, function (aData, aResult) {
if (Components.isSuccessCode(aResult) && aData && aData.available())
aCallback(aData);
});
},
/**
* Determines the crop size for a given content window.
* @param aWindow The content window.

40
browser/components/thumbnails/test/head.js
View File

@ -96,30 +96,32 @@ function whenLoaded(aElement, aCallback) {
function captureAndCheckColor(aRed, aGreen, aBlue, aMessage) {
let window = gBrowser.selectedTab.linkedBrowser.contentWindow;
let key = Date.now();
let data = PageThumbs.capture(window);
// Capture the screenshot.
PageThumbs.capture(window, function (aData) {
let key = Date.now();
// Store the thumbnail in the cache.
PageThumbs.store(key, data, function () {
let width = 100, height = 100;
let thumb = PageThumbs.getThumbnailURL(key, width, height);
// Store the thumbnail in the cache.
PageThumbs.store(key, aData, function () {
let width = 100, height = 100;
let thumb = PageThumbs.getThumbnailURL(key, width, height);
getXULDocument(function (aDocument) {
let htmlns = "http://www.w3.org/1999/xhtml";
let img = aDocument.createElementNS(htmlns, "img");
img.setAttribute("src", thumb);
getXULDocument(function (aDocument) {
let htmlns = "http://www.w3.org/1999/xhtml";
let img = aDocument.createElementNS(htmlns, "img");
img.setAttribute("src", thumb);
whenLoaded(img, function () {
let canvas = aDocument.createElementNS(htmlns, "canvas");
canvas.setAttribute("width", width);
canvas.setAttribute("height", height);
whenLoaded(img, function () {
let canvas = aDocument.createElementNS(htmlns, "canvas");
canvas.setAttribute("width", width);
canvas.setAttribute("height", height);
// Draw the image to a canvas and compare the pixel color values.
let ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, width, height);
checkCanvasColor(ctx, aRed, aGreen, aBlue, aMessage);
// Draw the image to a canvas and compare the pixel color values.
let ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, width, height);
checkCanvasColor(ctx, aRed, aGreen, aBlue, aMessage);
next();
next();
});
});
});
});