| <!DOCTYPE html> |
| <html> |
| <body> |
| <span id="description" style="color: white"> |
| Everything is same to draw-webgl-to-canvas-2d.html except for calling |
| redundant toDataURL(). |
| Canvas spec allows to call toDataURL() without a context. Some bad things |
| can happen if we call toDataURL() without a context and then create a context |
| and then call toDataURL() again. |
| </span> |
| <canvas id="preserve-canvas3d" width="100" height="100"></canvas> |
| <canvas id="preserve-canvas2d" width="100" height="100"></canvas> |
| <canvas id="nonpreserve-canvas3d" width="100" height="100"></canvas> |
| <canvas id="nonpreserve-canvas2d" width="100" height="100"></canvas> |
| <script src="../../../resources/js-test.js"></script> |
| <script src="../../../resources/run-after-layout-and-paint.js"></script> |
| <script src="resources/draw-webgl-to-canvas-2d.js"></script> |
| <script> |
| function createContexts() { |
| var preserve_canvas2d = document.getElementById("preserve-canvas2d"); |
| preserve_canvas2d.toDataURL(); |
| preserve_ctx2D = preserve_canvas2d.getContext("2d"); |
| preserve_canvas2d.toDataURL(); |
| preserve_canvas3D = document.getElementById('preserve-canvas3d'); |
| preserve_canvas3D.toDataURL(); |
| preserve_gl = preserve_canvas3D.getContext('webgl', {'preserveDrawingBuffer': true}); |
| preserve_canvas3D.toDataURL(); |
| |
| var nonpreserve_canvas2d = document.getElementById("nonpreserve-canvas2d"); |
| nonpreserve_canvas2d.toDataURL(); |
| nonpreserve_ctx2D = nonpreserve_canvas2d.getContext("2d"); |
| nonpreserve_canvas2d.toDataURL(); |
| nonpreserve_canvas3D = document.getElementById('nonpreserve-canvas3d'); |
| nonpreserve_canvas3D.toDataURL(); |
| nonpreserve_gl = nonpreserve_canvas3D.getContext('webgl', {'preserveDrawingBuffer': false}); |
| nonpreserve_canvas3D.toDataURL(); |
| } |
| </script> |
| </body> |
| </html> |
