| <html> |
| <head> |
| <script src="toDataURL-jpeg.js"></script> |
| <script> |
| if (window.testRunner) |
| testRunner.dumpAsText(); |
| |
| window.notifyEndTest = function () |
| { |
| if (window.testRunner) |
| testRunner.notifyDone(); |
| }; |
| |
| function testToDataURL(canvas, ctx) |
| { |
| ctx.fillStyle = '#00f'; |
| ctx.fillRect(0, 0, 100, 50); |
| ctx.fillStyle = '#0ff'; |
| ctx.fillRect(0, 3, 100, 1); |
| // Check for JPEG support first |
| var data = canvas.toDataURL('image/jpeg'); |
| if (!data.match(/^data:image\/jpeg[;,]/)) { |
| _assert(true, "true"); |
| } else { |
| var data_hi = canvas.toDataURL('image/jpeg', 0.99); |
| var data_lo = canvas.toDataURL('image/jpeg', 0.01); |
| ctx.fillStyle = '#f00'; |
| ctx.fillRect(0, 0, 100, 50); |
| deferTest(); |
| var img_hi = new Image(); |
| img_hi.onload = function () |
| { |
| var img_lo = new Image(); |
| img_lo.onload = wrapFunction(function () |
| { |
| ctx.drawImage(img_hi, 0, 0, 50, 50, 0, 0, 50, 50); |
| ctx.drawImage(img_lo, 0, 0, 50, 50, 50, 0, 50, 50); |
| |
| _assert(data_hi.length > data_lo.length, "data_hi.length > data_lo.length"); |
| _assertPixelApprox(canvas, 25,25, 0,0,255,255, "25,25", "0,0,255,255", 12); |
| _assertPixelApprox(canvas, 75,25, 0,0,255,255, "75,25", "0,0,255,255", 12); |
| }); |
| img_lo.src = data_lo; |
| }; |
| img_hi.src = data_hi; |
| |
| if (window.testRunner) |
| testRunner.waitUntilDone(); |
| } |
| } |
| |
| _addTest(testToDataURL); |
| </script> |
| </head> |
| <body> |
| <p>To verify basic jpeg compressing loss: 1) Low qulity URL's length should be shorter than high qulity URL's length, 2) Compress loss should be in a tolerable range</p> |
| <canvas id="c" width="100" height="50"></canvas> |
| <p id="d"></p> |
| </body> |
| </html> |
