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Issue 2490443002:
Make OffscreenCanvas an EventTarget (Closed)
| Index: third_party/WebKit/LayoutTests/fast/canvas/webgl/offscreenCanvas-context-lost-restored.html |
| diff --git a/third_party/WebKit/LayoutTests/fast/canvas/webgl/offscreenCanvas-context-lost-restored.html b/third_party/WebKit/LayoutTests/fast/canvas/webgl/offscreenCanvas-context-lost-restored.html |
| new file mode 100644 |
| index 0000000000000000000000000000000000000000..bfb22a003c1f866af8d5a0ea6054b3a6dff02f36 |
| --- /dev/null |
| +++ b/third_party/WebKit/LayoutTests/fast/canvas/webgl/offscreenCanvas-context-lost-restored.html |
| @@ -0,0 +1,120 @@ |
| +<!DOCTYPE html> |
| +<html> |
| +<head> |
| +<script src="../../../resources/testharness.js"></script> |
| +<script src="../../../resources/testharnessreport.js"></script> |
| +<script src="./resources/webgl-test-utils-full.js"></script> |
| +</head> |
| + |
| +<body> |
| +<script> |
| +var wtu = WebGLTestUtils; |
| +var canvas; |
| +var gl; |
| +var WEBGL_lose_context; |
| +var allowRestore; |
| +var contextLostEventFired; |
| +var contextRestoredEventFired; |
| + |
| +function setupTest() |
| +{ |
| + canvas = new OffscreenCanvas(10, 10); |
| + gl = canvas.getContext('webgl'); |
| + WEBGL_lose_context = getExtensionAndAddProperty(gl, "WEBGL_lose_context"); |
| + if (!WEBGL_lose_context) { |
| + return false; |
| + } |
| + |
| + return true; |
| +} |
| + |
| +function getExtensionAndAddProperty(gl, name) { |
| + var ext = wtu.getExtensionWithKnownPrefixes(gl, name); |
| + if (ext) { |
| + ext.webglTestProperty = true; |
| + } |
| + return ext; |
| +} |
| + |
| +function testOriginalContext() |
| +{ |
| + assert_false(gl.isContextLost()); |
| + assert_equals(gl.getError(), gl.NO_ERROR); |
| +} |
| + |
| +function testLostContext(e) |
| +{ |
| + assert_false(contextLostEventFired); |
| + contextLostEventFired = true; |
| + assert_true(gl.isContextLost()); |
| + assert_equals(gl.getError(), gl.NO_ERROR); |
| + if (allowRestore) |
| + e.preventDefault(); |
| +} |
| + |
| +function testShouldNotRestoreContext(e) |
| +{ |
| + assert_true(false, "Should not restore the context unless preventDefault is called on the context lost event"); |
| +} |
| + |
| +function compareGLError(glError, evalStr) { |
| + var exception; |
| + try { |
| + eval(evalStr); |
| + } catch(e) { |
| + exception = e; |
| + } |
| + if (exception) { |
| + assert_true(false, evalStr + " threw exception " + exception); |
| + } else { |
| + assert_equals(gl.getError(), glError); |
| + } |
| +} |
| + |
| +function testRestoredContext() |
| +{ |
| + assert_false(contextRestoredEventFired); |
| + contextRestoredEventFired = true; |
| +// assert_false(gl.isContextLost()); |
|
xidachen
2016/11/13 01:53:41
kbr@, zmo@: could you please provide some suggesti
|
| + assert_equals(gl.getError(), gl.NO_ERROR); |
| +} |
| + |
| +async_test(function(t) { |
| + if (!setupTest()) |
| + assert_true(false, "Cannot initialize test"); |
| + testOriginalContext(); |
| + |
| + canvas.addEventListener("webglcontextrestored", testShouldNotRestoreContext); |
| + canvas.addEventListener("webglcontextlost", function(e) { |
| + testLostContext(e); |
| + // restore the context after this event has exited. |
| + setTimeout(t.step_func(function() { |
| + // we didn't call prevent default so we should not be able to restore the context |
| + compareGLError(gl.INVALID_OPERATION, "WEBGL_lose_context.restoreContext()"); |
| + assert_true(gl.isContextLost()); |
| + assert_equals(gl.getError(), gl.NO_ERROR); |
| + // gl methods should still be no-ops |
| + compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)"); |
| + setTimeout(t.step_func_done(function() { |
| + testRestoredContext(); |
| + }, 0)); |
| + }, 0)); |
| + }); |
| + allowRestore = false; |
| + contextLostEventFired = false; |
| + contextRestoredEventFired = false; |
| + |
| + WEBGL_lose_context.loseContext(); |
| + // The context should be lost immediately. |
| + assert_true(gl.isContextLost()); |
| + assert_equals(gl.getError(), gl.CONTEXT_LOST_WEBGL); |
| + assert_equals(gl.getError(), gl.NO_ERROR); |
| + // gl methods should be no-ops |
| + compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)"); |
| + // but the event should not have been fired. |
| + assert_false(contextLostEventFired); |
| +}, 'Test behavior under a restored context with OffscreenCanvas'); |
| + |
| +</script> |
| +</body> |
| +</html> |
