| <head> |
| <script> |
| let useAlternateContent = false; |
| |
| let sz = 2; |
| let color = 255; |
| |
| function tick() { |
| let canvas = document.getElementById('canvas'); |
| let c = canvas.getContext('2d'); |
| if (useAlternateContent) { |
| let fillStyle = 'rgba(' + color + ',0,0,1.0)'; |
| c.fillStyle = fillStyle; |
| --color; |
| } else { |
| c.fillStyle = 'rgba(255,255,255,1.0)'; |
| } |
| useAlternateContent = !useAlternateContent; |
| c.fillRect(0, 0, sz, sz); |
| setTimeout(tick, 1000); |
| } |
| |
| function main() { |
| if (window.domAutomationController) { |
| domAutomationController.send("SUCCESS"); |
| } |
| |
| let canvas = document.getElementById('canvas'); |
| canvas.width = sz; |
| canvas.height = sz; |
| |
| // This page is used in the main tab in a couple of dual-GPU tests |
| // on macOS. When running on the passthrough command decoder and |
| // ANGLE, ANGLE can only detect the need to switch GPUs upon context |
| // switch. Schedule a small amount of periodic rasterization work so |
| // that context switches occur in the GPU process. |
| setTimeout(tick, 1000); |
| } |
| </script> |
| </head> |
| <body onload="main()"> |
| <canvas id="canvas"></canvas> |
| </body> |
