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Canvases should reset their contents when width or height is set #3613

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Canvases should reset their contents when width or height is set #3613

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28 changes: 27 additions & 1 deletion sdk/tests/conformance/canvas/canvas-test.html
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Original file line number Diff line number Diff line change
Expand Up @@ -182,7 +182,33 @@
"gl.colorMask should not change after canvas resize");
shouldBe('getViewport()', '"0,0,300,150"');
checkCanvasContentIs(0, 0, 0, 0);
}

debug("");
debug("change the size of the canvas to the same size it already is and see that it gets cleared");
gl.colorMask(true, true, true, true);
gl.clearColor(0.25, 0.5, 0.75, 1);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
// Check it's not cleared
checkCanvasContentIs(64, 128, 192, 255);
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Would be nice to test that stencil and depth are cleared, too. That's of course cumbersome..


gl.canvas.width = gl.canvas.width;
err = gl.getError();
// Some implementations might lost the context when resizing
if (err != gl.CONTEXT_LOST_WEBGL) {
checkCanvasContentIs(0, 0, 0, 0);

gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
// Check it's not cleared
checkCanvasContentIs(64, 128, 192, 255);

gl.canvas.height = gl.canvas.height;
err = gl.getError();
// Some implementations might lost the context when resizing
if (err != gl.CONTEXT_LOST_WEBGL) {
checkCanvasContentIs(0, 0, 0, 0);
}
}
}

debug("");
finishTest();
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