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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
.container {
width: 60px;
height: 60px;
margin: 5px;
}
canvas {
background-color: green;
}
#canvas-simple {}
#canvas-padding { padding: 5px; }
#canvas-border { border: 5px solid; }
#canvas-image { background-image: url("../resources/simple_image.png"); }
#canvas-transparent-background { background-color: rgba(0, 255, 0, 0.5); }
#canvas-opaque { border: 5px solid; }
</style>
<script>
if (window.testRunner)
testRunner.dumpAsText();
function drawCanvas(canvasID, hasAlpha) {
var canvas = document.getElementById(canvasID);
var context = canvas.getContext("2d", {alpha: hasAlpha});
context.clearRect(0, 0, canvas.width, canvas.height);
};
function doTest() {
// Simple background can be direct-composited with content-layer.
// The container GraphicsLayer does not paint anything.
// The content layer should be treated as opaque because the
// background color is opaque.
drawCanvas('canvas-simple', true);
// Padding makes the background-box bigger than content-box.
// The container GraphicsLayer needs to paint background.
drawCanvas('canvas-padding', true);
// Content layer cannot direct-composite any kind of box decoration.
// The container GraphicsLayer needs to paint box decorations.
drawCanvas('canvas-border', true);
// Content layer cannot direct-composite background image.
// The container GraphicsLayer needs to paint background image.
drawCanvas('canvas-image', true);
// Simple background can be direct-composited with content-layer.
// The container GraphicsLayer does not paint anything.
// The content layer should not be treated as opaque because the
// background color is not opaque.
drawCanvas('canvas-transparent-background', true);
// Background cannot be direct-composited because of box decoration.
// However contents of the canvas are opaque so the background does
// not need to be painted.
drawCanvas('canvas-opaque', false);
if (window.testRunner && window.internals)
document.getElementById('layer-tree').innerText = window.internals.layerTreeAsText(document);
};
window.addEventListener('load', doTest, false);
</script>
</head>
<body>
<div class="container">
<canvas id="canvas-simple" width="50" height="50"></canvas>
</div>
<div class="container">
<canvas id="canvas-transparent-background" width="50" height="50"></canvas>
</div>
<div class="container">
<canvas id="canvas-padding" width="50" height="50"></canvas>
</div>
<div class="container">
<canvas id="canvas-border" width="50" height="50"></canvas>
</div>
<div class="container">
<canvas id="canvas-image" width="50" height="50"></canvas>
</div>
<div class="container">
<canvas id="canvas-opaque" width="50" height="50"></canvas>
</div>
<pre id="layer-tree"></pre>
</body>
</html>
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