| Index: content/test/data/gpu/pixel_webgl_noalpha_implicit_clear.html
|
| diff --git a/content/test/data/gpu/pixel_webgl_noalpha_implicit_clear.html b/content/test/data/gpu/pixel_webgl_noalpha_implicit_clear.html
|
| new file mode 100644
|
| index 0000000000000000000000000000000000000000..6aebb64506bf489689c14b6deaa3c9c3c6fda900
|
| --- /dev/null
|
| +++ b/content/test/data/gpu/pixel_webgl_noalpha_implicit_clear.html
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| @@ -0,0 +1,89 @@
|
| +<!DOCTYPE HTML>
|
| +
|
| +<!-- READ BEFORE UPDATING:
|
| +If this test is updated make sure to increment the "revision" value of the
|
| +associated test in content/test/gpu/page_sets/pixel_tests.py. This will ensure
|
| +that the baseline images are regenerated on the next run.
|
| +-->
|
| +
|
| +<!--
|
| +This is a regression test for crbug.com/666259 .
|
| +
|
| +It renders transparent green (0,255,0,0) into a canvas with
|
| +{alpha:false, preserveDrawingBuffer:false}, over a <div> with a CSS
|
| +background-color of red (#f00). Specifically, it does this while triggering an
|
| +implicit clear (due to the preserveDrawingBuffer:false setting).
|
| +
|
| +This should result in a green (0,255,0) triangle on a black (0,0,0) background
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| +with a red (255,0,0) box behind it.
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| +
|
| +Previously this was incorrectly blended on Mac (w/ IOSurface) and the result
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| +would have been yellow (255,255,0). The implicit clear was clobbering the alpha
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| +channel of the canvas (which should be impossible with alpha:false).
|
| +-->
|
| +
|
| +<html>
|
| +<head>
|
| +<title>WebGL Test: Transparent Green Triangle over Red Background</title>
|
| +<style type="text/css">
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| +.nomargin {
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| + margin: 0px auto;
|
| +}
|
| +</style>
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| +
|
| +<script src="pixel_webgl_util.js"></script>
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| +
|
| +<script>
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| +// Overwrite the vertexShader and fragmentShader created by pixel_webgl_util.
|
| +window.vertexShader = [
|
| + "attribute vec3 pos;",
|
| + "void main(void)",
|
| + "{",
|
| + " gl_Position = vec4(pos, 1.0);",
|
| + "}"
|
| +].join("\n");
|
| +
|
| +window.fragmentShader = [
|
| + "precision mediump float;",
|
| + "void main(void)",
|
| + "{",
|
| + " gl_FragColor = vec4(0.0, 1.0, 0.0, 0.0);",
|
| + "}"
|
| +].join("\n");
|
| +
|
| +function waitForComposite(callback) {
|
| + var frames = 5;
|
| + var countDown = function() {
|
| + if (frames == 0) {
|
| + callback();
|
| + } else {
|
| + --frames;
|
| + window.requestAnimationFrame(countDown);
|
| + }
|
| + };
|
| + countDown();
|
| +};
|
| +
|
| +function main() {
|
| + var canvas = document.getElementById("c");
|
| + var gl = initGL(canvas, false, false);
|
| + if (gl && setup(gl)) {
|
| + waitForComposite(function() {
|
| + gl.drawArrays(gl.TRIANGLES, 0, 3);
|
| + domAutomationController.setAutomationId(1);
|
| + domAutomationController.send("SUCCESS");
|
| + });
|
| + } else {
|
| + domAutomationController.setAutomationId(1);
|
| + domAutomationController.send("FAILURE");
|
| + }
|
| +}
|
| +</script>
|
| +</head>
|
| +<body onload="main()">
|
| +<div style="position:relative; width:200px; height:200px; background-color:#f00"></div>
|
| +<div style="position:absolute; top:0px; left:0px">
|
| +<canvas id="c" width="200" height="200" class="nomargin"></canvas>
|
| +</div>
|
| +</body>
|
| +</html>
|
|
|
Chromium Code Reviews
Issue 2535173002:
Prevent implicit framebuffer clear from clobbering alpha in emulated RGB (Closed)
