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Refactor canvas imageData test slightly.

This commit is contained in:
Joel Martin 2010-06-24 17:09:54 -05:00
parent 486cd527f2
commit 48eed1ac05
1 changed files with 16 additions and 12 deletions
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28
include/canvas.js
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@ -13,12 +13,14 @@
var Canvas, Canvas_native;
(function () {
var pre, extra = "", start, end;
var pre, start = "<script src='", end = "'><\/script>";
if (document.createElement('canvas').getContext) {
Canvas_native = true;
} else {
pre = (typeof VNC_uri_prefix !== "undefined") ?
VNC_uri_prefix : "include/";
document.write(start + pre + "excanvas.js" + end);
Canvas_native = false;
document.write("<script src='excanvas'><\/script>");
}
}());
@ -146,6 +148,7 @@ init: function (id) {
// Use default Canvas functions
} else {
console.warn("Using excanvas canvas emulation");
//G_vmlCanvasManager.init(c);
G_vmlCanvasManager.initElement(c);
}
@ -154,21 +157,25 @@ init: function (id) {
Canvas.clear();
/*
* Determine browser feature support and most optimal rendering
* methods
* Determine browser Canvas feature support
* and select fastest rendering methods
*/
tval = 0;
Canvas.has_imageData = false;
try {
imgTest = Canvas.ctx.getImageData(0, 0, 1,1);
imgTest.data[0] = 123;
imgTest.data[3] = 255;
Canvas.ctx.putImageData(imgTest, 0, 0);
tval = Canvas.ctx.getImageData(0, 0, 1, 1).data[0];
} catch (exc) {
}
if (tval === 123) {
if (tval === 123) {
Canvas.has_imageData = true;
}
} catch (exc) {}
if (Canvas.has_imageData) {
console.log("Canvas supports imageData");
Canvas._rgbxImage = Canvas._rgbxImageData;
Canvas._cmapImage = Canvas._cmapImageData;
if (Canvas.ctx.createImageData) {
@ -178,9 +185,6 @@ init: function (id) {
} else if (Canvas.ctx.getImageData) {
console.log("Using Canvas getImageData");
Canvas._imageData = Canvas._imageDataGet;
} else {
console.log("No imageData support");
return false;
}
if (Util.Engine.webkit) {
console.log("Prefering javascript operations");
@ -190,7 +194,7 @@ init: function (id) {
Canvas.prefer_js = false;
}
} else {
console.log("No imageData, using fillRect (slow)");
console.log("Canvas lacks imageData, using fillRect (slow)");
Canvas._rgbxImage = Canvas._rgbxImageFill;
Canvas._cmapImage = Canvas._cmapImageFill;
Canvas.prefer_js = false;