LayoutTests/fast/canvas/canvas-scale-shadowBlur_t01.dart

/*
 * Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 * for details. All rights reserved. Use of this source code is governed by a
 * BSD-style license that can be found in the LICENSE file.
 */
/** 
 * @description Ensure that canvas shadowBlur is not affected by transformations.
 */
import "dart:html";
import "dart:math" as Math;
import "../../testcommon.dart";
import "../../../Utils/async_utils.dart";

main() {
  shouldBeAround(a, b) => shouldBeApprox(a, b, 10);

  var canvas = document.createElement('canvas');
  document.body.append(canvas);
  canvas.setAttribute('width', '600');
  canvas.setAttribute('height', '600');
  var ctx = canvas.getContext('2d');

  ctx.shadowBlur = 25;
  ctx.shadowOffsetX = 100;
  ctx.shadowOffsetY = 100;
  ctx.fillStyle = 'rgba(0, 0, 255, 1)';

  // top left
  ctx.shadowColor = 'rgba(255, 0, 0, 1.0)';
  ctx.scale(4, 4);
  ctx.rotate(Math.PI/2);
  ctx.translate(25, -50);
  ctx.fillRect(0, 0, 25, 25);

  // bottom left
  ctx.shadowColor = 'rgba(255, 0, 0, 0.5)';
  ctx.setTransform(1, 0, 0, 1, 0, 0);
  ctx.scale(0.5, 0.5);
  ctx.fillRect(200, 600, 200, 200);

  // top right
  ctx.shadowColor = 'rgba(255, 0, 0, 1.0)';
  ctx.scale(2, 2);
  ctx.fillRect(300, 100, 100, 100);

  // bottom right
  ctx.shadowColor = 'rgba(255, 0, 0, 0.5)';
  ctx.fillRect(300, 300, 100, 100);

  var d;

  // top left
  d = ctx.getImageData(250, 250, 1, 1).data;
  shouldBe(d[0], 255);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBeAround(d[3], 255);

  d = ctx.getImageData(250, 175, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(250, 325, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(175, 250, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(325, 250, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  // bottom left
  d = ctx.getImageData(250, 450, 1, 1).data;
  shouldBe(d[0], 255);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBeAround(d[3], 126);

  d = ctx.getImageData(250, 375, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(250, 525, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(175, 450, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(325, 450, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(250, 250, 1, 1).data;
  shouldBe(d[0], 255);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBeAround(d[3], 255);

  // top right
  d = ctx.getImageData(450, 250, 1, 1).data;
  shouldBe(d[0], 255);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBeAround(d[3], 255);

  d = ctx.getImageData(450, 175, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(450, 325, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(375, 250, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(525, 250, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  // top right
  d = ctx.getImageData(450, 450, 1, 1).data;
  shouldBe(d[0], 255);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBeAround(d[3], 126);

  d = ctx.getImageData(450, 375, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(450, 525, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(375, 450, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);

  d = ctx.getImageData(525, 450, 1, 1).data;
  shouldBe(d[0], 0);
  shouldBe(d[1], 0);
  shouldBe(d[2], 0);
  shouldBe(d[3], 0);
}