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 /* vim: set ts=2 et sw=2 tw=80: */

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 // Tests that the spectrum color picker works correctly

 const TEST_URI = "data:text/html;charset=utf-8,<div></div>";

 const {CSSTransformPreviewer} = devtools.require("devtools/shared/widgets/CSSTransformPreviewer");

 let doc, root;

 function test() {

   waitForExplicitFinish();

   addTab(TEST_URI, () => {

     doc = content.document;

     root = doc.querySelector("div");

     startTests();

   });

 }

 function endTests() {

   doc = root = null;

   gBrowser.removeCurrentTab();

   finish();

 }

 function startTests() {

   testCreateAndDestroyShouldAppendAndRemoveElements();

 }

 function testCreateAndDestroyShouldAppendAndRemoveElements() {

   ok(root, "We have the root node to append the preview to");

   is(root.childElementCount, 0, "Root node is empty");

   let p = new CSSTransformPreviewer(root);

   p.preview("matrix(1, -0.2, 0, 1, 0, 0)");

   ok(root.childElementCount > 0, "Preview has appended elements");

   ok(root.querySelector("canvas"), "Canvas preview element is here");

   p.destroy();

   is(root.childElementCount, 0, "Destroying preview removed all nodes");

   testCanvasDimensionIsConstrainedByMaxDim();

 }

 function testCanvasDimensionIsConstrainedByMaxDim() {

   let p = new CSSTransformPreviewer(root);

   p.MAX_DIM = 500;

   p.preview("scale(1)", "center", 1000, 1000);

   let canvas = root.querySelector("canvas");

   is(canvas.width, 500, "Canvas width is correct");

   is(canvas.height, 500, "Canvas height is correct");

   p.destroy();

   testCallingPreviewSeveralTimesReusesTheSameCanvas();

 }

 function testCallingPreviewSeveralTimesReusesTheSameCanvas() {

   let p = new CSSTransformPreviewer(root);

   p.preview("scale(1)", "center", 1000, 1000);

   let canvas = root.querySelector("canvas");

   p.preview("rotate(90deg)");

   let canvases = root.querySelectorAll("canvas");

   is(canvases.length, 1, "Still one canvas element");

   is(canvases[0], canvas, "Still the same canvas element");

   p.destroy();

   testCanvasDimensionAreCorrect();

 }

 function testCanvasDimensionAreCorrect() {

   // Only test a few simple transformations

   let p = new CSSTransformPreviewer(root);

   // Make sure we have a square

   let w = 200, h = w;

   p.MAX_DIM = w;

   // We can't test the content of the canvas here, just that, given a max width

   // the aspect ratio of the canvas seems correct.

   // Translate a square by its width, should be a rectangle

   p.preview("translateX(200px)", "center", w, h);

   let canvas = root.querySelector("canvas");

   is(canvas.width, w, "width is correct");

   is(canvas.height, h/2, "height is half of the width");

   // Rotate on the top right corner, should be a rectangle

   p.preview("rotate(-90deg)", "top right", w, h);

   is(canvas.width, w, "width is correct");

   is(canvas.height, h/2, "height is half of the width");

   // Rotate on the bottom left corner, should be a rectangle

   p.preview("rotate(90deg)", "top right", w, h);

   is(canvas.width, w/2, "width is half of the height");

   is(canvas.height, h, "height is correct");

   // Scale from center, should still be a square

   p.preview("scale(2)", "center", w, h);

   is(canvas.width, w, "width is correct");

   is(canvas.height, h, "height is correct");

   // Skew from center, 45deg, should be a rectangle

   p.preview("skew(45deg)", "center", w, h);

   is(canvas.width, w, "width is correct");

   is(canvas.height, h/2, "height is half of the height");

   p.destroy();

   testPreviewingInvalidTransformReturnsFalse();

 }

 function testPreviewingInvalidTransformReturnsFalse() {

   let p = new CSSTransformPreviewer(root);

   ok(!p.preview("veryWow(muchPx) suchTransform(soDeg)"), "Returned false for invalid transform");

   ok(!p.preview("rotae(3deg)"), "Returned false for invalid transform");

   // Verify the canvas is empty by checking the image data

   let canvas = root.querySelector("canvas"), ctx = canvas.getContext("2d");

   let data = ctx.getImageData(0, 0, canvas.width, canvas.height).data;

   for (let i = 0, n = data.length; i < n; i += 4) {

     // Let's not log 250*250*4 asserts! Instead, just log when it fails

     let red = data[i];

     let green = data[i + 1];

     let blue = data[i + 2];

     let alpha = data[i + 3];

     if (red !== 0 || green !== 0 || blue !== 0 || alpha !== 0) {

       ok(false, "Image data is not empty after an invalid transformed was previewed");

       break;

     }

   }

   is(p.preview("translateX(30px)"), true, "Returned true for a valid transform");

   endTests();

 }