The Tor Browser: content/canvas/test/webgl-conformance/conformance/reading/read-pixels-pack-alignment.html@8bccb770b82d (annotated)

content/canvas/test/webgl-conformance/conformance/reading/read-pixels-pack-alignment.html@8bccb770b82d (annotated)

content/canvas/test/webgl-conformance/conformance/reading/read-pixels-pack-alignment.html

Wed, 31 Dec 2014 13:27:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 13:27:57 +0100
branch: TOR_BUG_3246
changeset 6: 8bccb770b82d
permissions: -rw-r--r--

Ignore runtime configuration files generated during quality assurance.

 <!--
 Copyright (c) 2011 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
  -->
 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
 <script src="../../resources/js-test-pre.js"></script>
 <script src="../resources/webgl-test.js"></script>
 <script id="vshader" type="x-shader/x-vertex">
 attribute vec3 pos;
 attribute vec4 colorIn;
 varying vec4 color;
 void main()
 {
     color = colorIn;
     gl_Position = vec4(pos.xyz, 1.0);
 }
 </script>
 <script id="fshader" type="x-shader/x-fragment">
 precision mediump float;
 varying vec4 color;
 void main()
 {
     gl_FragColor = color;
 }
 </script>
 </head>
 <body>
 <canvas id="example" width="32px" height="32px"></canvas>
 <div id="description"></div>
 <div id="console"></div>
 <script>
 var successfullyParsed = false;
 // The below declarations need to be global for "shouldBe" to see them
 var gl = null;
 var array = null;
 var pixel = [ 0, 0, 0, 0 ];
 var expectedColor = [ 0, 0, 0, 0 ];
 function calculatePixelBytes(format, type)
 {
     var size = 0;
     switch (format) {
     case gl.ALPHA:
         size = 1;
         break;
     case gl.RGB:
         size = 3;
         break;
     case gl.RGBA:
         size = 4;
         break;
     default:
         return -1;
     }
     switch (type) {
     case gl.UNSIGNED_BYTE:
         break;
     case gl.UNSIGNED_SHORT_5_6_5:
         if (format != gl.RGB)
             return -1;
         size = 2;
         break;
     case gl.UNSIGNED_SHORT_4_4_4_4:
     case gl.UNSIGNED_SHORT_5_5_5_1:
         if (format != gl.RGBA)
             return -1;
         size = 2;
         break;
     default:
         return -1;
     }
     return size;
 }
 function calculatePaddingBytes(bytesPerPixel, packAlignment, width)
 {
     var padding = 0;
     switch (packAlignment) {
     case 1:
     case 2:
     case 4:
     case 8:
         padding = (bytesPerPixel * width) % packAlignment;
         if (padding > 0)
             padding = packAlignment - padding;
         break;
     default:
         return -1;
     }
     return padding;
 }
 function packColor(format, type, r, g, b, a)
 {
     // FIXME: not sure if the color packing is correct for UNSIGNED_SHORT_*.
     var color = [ 0, 0, 0, 0 ];
     switch (type) {
     case gl.UNSIGNED_BYTE:
         switch (format) {
         case gl.ALPHA:
             color[0] = a;
             break;
         case gl.RGB:
             color[0] = r;
             color[1] = g;
             color[2] = b;
             break;
         case gl.RGBA:
             color[0] = r;
             color[1] = g;
             color[2] = b;
             color[3] = a;
             break;
         default:
             return null;
         }
         break;
     case gl.UNSIGNED_SHORT_5_6_5:
         if (format != gl.RGB)
             return null;
         r >>= 3;
         g >>= 2;
         b >>= 3;
         color[0] = (r << 11) + (g << 5) + b;
         break;
     case gl.UNSIGNED_SHORT_4_4_4_4:
         if (format != gl.RGBA)
             return null;
         r >>= 4;
         g >>= 4;
         b >>= 4;
         a >>= 4;
         color[0] = (r << 12) + (g << 8) + (b << 4) + a;
         break;
     case gl.UNSIGNED_SHORT_5_5_5_1:
         if (format != gl.RGBA)
             return null;
         r >>= 3;
         g >>= 3;
         b >>= 3;
         a >>= 7;
         color[0] = (r << 11) + (g << 6) + (b << 1) + a;
         break;
     Default:
         return null;
     }
     return color;
 }
 function runTestIteration(format, type, packAlignment, width, height)
 {
     debug("Testing PACK_ALIGNMENT = " + packAlignment + ", width = " + width + ", height = " + height);
     gl.clearColor(1, 0.4, 0, 1);
     gl.clear(gl.COLOR_BUFFER_BIT);
     gl.pixelStorei(gl.PACK_ALIGNMENT, packAlignment);
     glErrorShouldBe(gl, gl.NO_ERROR);
     var bytesPerPixel = calculatePixelBytes(format, type);
     var padding = calculatePaddingBytes(bytesPerPixel, packAlignment, width);
     var size = bytesPerPixel * width * height + padding * (height - 1);
     if (type != gl.UNSIGNED_BYTE) {
         throw "test error: only UNSIGNED_BYTE is valid to ReadPixels";
     }
     if (size < 0)
         size = 0;
     array = new Uint8Array(size);
     gl.readPixels(0, 0, width, height, format, type, array);
     if (width < 0 || height < 0) {
         glErrorShouldBe(gl, gl.INVALID_VALUE);
         return;
     }
     glErrorShouldBe(gl, gl.NO_ERROR);
     if (!array.length)
         return;
     // Check the last pixel of the last row.
     var bytesPerRow = width * bytesPerPixel + padding;
     var pos = bytesPerRow * (height - 1) + (width - 1) * bytesPerPixel;
     var numComponents = bytesPerPixel;
     for (var i = 0; i < numComponents; ++i)
         pixel[i] = array[pos + i];
     for (var i = numComponents; i < 4; ++i)
         pixel[i] = 0;
     expectedColor = packColor(format, type, 255, 102, 0, 255);
     shouldBeNonNull("expectedColor");
     shouldBe("pixel", "expectedColor");
 }
 description('Verify readPixels() works fine with various PACK_ALIGNMENT values.');
 shouldBeNonNull("gl = initWebGL('example', 'vshader', 'fshader', [ 'pos', 'colorIn' ], [ 0, 0, 0, 1 ], 1)");
 gl.disable(gl.BLEND);
 var formats = [ gl.RGBA ];
 var formatNames = [ "RGBA" ];
 for (var i = 0; i < formats.length; ++i) {
     var format = formats[i];
     debug("Testing format = " + formatNames[i] + " and type = UNSIGNED_BYTE");
     runTestIteration(format, gl.UNSIGNED_BYTE, 1, 1, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 2, 1, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 4, 1, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, 1, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 4, 2, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, 2, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 4, 3, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, 3, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 4, 4, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, 4, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, 5, 1);
     runTestIteration(format, gl.UNSIGNED_BYTE, 4, 5, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, 5, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, 6, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, 7, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, 8, 2);
     runTestIteration(format, gl.UNSIGNED_BYTE, 1, 0, 0);
     runTestIteration(format, gl.UNSIGNED_BYTE, 2, 0, 0);
     runTestIteration(format, gl.UNSIGNED_BYTE, 4, 0, 0);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, 0, 0);
     runTestIteration(format, gl.UNSIGNED_BYTE, 1, -1, 1);
     runTestIteration(format, gl.UNSIGNED_BYTE, 2, 1, -1);
     runTestIteration(format, gl.UNSIGNED_BYTE, 4, 0, -1);
     runTestIteration(format, gl.UNSIGNED_BYTE, 8, -1, -1);
 }
 successfullyParsed = true;
 </script>
 <script>finishTest();</script>
 </body>
 </html>

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content/canvas/test/webgl-conformance/conformance/reading/read-pixels-pack-alignment.html@8bccb770b82d (annotated)

content/canvas/test/webgl-conformance/conformance/reading/read-pixels-pack-alignment.html