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Tests toDataURL image types with a large canvas
<canvas id="canvas" width="1280" height="720" style="width:1280px; height:720px;">
</canvas>
c = document.getElementById("canvas");
ctx = c.getContext("2d");
cpa = ctx.createImageData(1280, 720);
for (var i = 0; i < 1280 * 720; i++) {
cpa.data[i * 4 + 0] = Math.round(Math.random() * 255);
cpa.data[i * 4 + 1] = Math.round(Math.random() * 255);
cpa.data[i * 4 + 2] = Math.round(Math.random() * 255);
cpa.data[i * 4 + 3] = 255;
}
ctx.putImageData(cpa, 0, 0);
function toBlob1(dataURL) {
binary = atob( dataURL.substr( dataURL.indexOf(',') + 1 ) ),
i = binary.length,
view = new Uint8Array(i);
while (i--) {
view[i] = binary.charCodeAt(i);
}
return view;
};
function toBlob2(dataURI) {
var binary = atob(dataURI.split(',')[1]);
var array = [];
var size = binary.length;
for (var i = 0; i < size; i++) {
array.push(binary.charCodeAt(i));
}
new Uint8Array(array);
};
var data = c.toDataURL('image/jpeg', 0.9);
Ready to run.
Test | Ops/sec | |
---|---|---|
image data |
| ready |
image/jpeg 1.0 |
| ready |
image/jpeg 0.8 |
| ready |
image/png |
| ready |
toBlob1 |
| ready |
toBlob2 |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.