| <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> |
| <html> |
| <head> |
| <script src="../../resources/js-test-pre.js"></script> |
| </head> |
| <body> |
| <script> |
| description("Ensure correct behavior of canvas with path stroke + shadow after scaling. A blue and red checkered pattern should be displayed."); |
| |
| function print(message, color) |
| { |
| var paragraph = document.createElement("div"); |
| paragraph.appendChild(document.createTextNode(message)); |
| paragraph.style.fontFamily = "monospace"; |
| if (color) |
| paragraph.style.color = color; |
| document.getElementById("console").appendChild(paragraph); |
| } |
| |
| function shouldBeAround(a, b, argdelta) |
| { |
| var evalA; |
| try { |
| evalA = eval(a); |
| } catch(e) { |
| evalA = e; |
| } |
| |
| var delta = 20; |
| if (typeof argdelta != "undefined") |
| delta = argdelta; |
| |
| if (Math.abs(evalA - b) < delta) |
| print("PASS " + a + " is around " + b , "green") |
| else |
| print("FAIL " + a + " is not around " + b + " (actual: " + evalA + ")", "red"); |
| } |
| |
| var canvas = document.createElement('canvas'); |
| document.body.appendChild(canvas); |
| canvas.setAttribute('width', '600'); |
| canvas.setAttribute('height', '600'); |
| var ctx = canvas.getContext('2d'); |
| |
| ctx.scale(2, 2); |
| ctx.shadowOffsetX = 100; |
| ctx.shadowOffsetY = 100; |
| ctx.strokeStyle = 'rgba(0, 0, 255, 1)'; |
| ctx.lineWidth = 5; |
| |
| ctx.shadowColor = 'rgba(255, 0, 0, 1.0)'; |
| ctx.beginPath(); |
| ctx.moveTo(50, 50); |
| ctx.lineTo(100, 50); |
| ctx.lineTo(100, 100); |
| ctx.lineTo(50, 100); |
| ctx.lineTo(50, 50); |
| ctx.stroke(); |
| |
| ctx.shadowColor = 'rgba(255, 0, 0, 0.3)'; |
| ctx.beginPath(); |
| ctx.moveTo(50, 150); |
| ctx.lineTo(100, 150); |
| ctx.lineTo(100, 200); |
| ctx.lineTo(50, 200); |
| ctx.lineTo(50, 150); |
| ctx.stroke(); |
| |
| ctx.shadowColor = 'rgba(255, 0, 0, 1.0)'; |
| ctx.shadowBlur = 10; |
| ctx.beginPath(); |
| ctx.moveTo(150, 50); |
| ctx.lineTo(200, 50); |
| ctx.lineTo(200, 100); |
| ctx.lineTo(150, 100); |
| ctx.lineTo(150, 50); |
| ctx.stroke(); |
| |
| ctx.shadowColor = 'rgba(255, 0, 0, 0.6)'; |
| ctx.beginPath(); |
| ctx.moveTo(150, 150); |
| ctx.lineTo(200, 150); |
| ctx.lineTo(200, 200); |
| ctx.lineTo(150, 200); |
| ctx.lineTo(150, 150); |
| ctx.stroke(); |
| |
| var d; // imageData.data |
| |
| // Verify solid shadow. |
| d = ctx.getImageData(250, 200, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBe('d[3]', '255'); |
| |
| d = ctx.getImageData(300, 290, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBe('d[3]', '255'); |
| |
| d = ctx.getImageData(200, 250, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBe('d[3]', '255'); |
| |
| // Verify solid alpha shadow. |
| d = ctx.getImageData(201, 405, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '76'); |
| |
| d = ctx.getImageData(201, 500, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '76'); |
| |
| d = ctx.getImageData(300, 499, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '76'); |
| |
| // Verify blurry shadow. |
| d = ctx.getImageData(398, 210, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '200', 25); |
| |
| d = ctx.getImageData(508, 250, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '49'); |
| |
| d = ctx.getImageData(450, 198, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '199', 25); |
| |
| // Verify blurry alpha shadow. |
| d = ctx.getImageData(505, 450, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '70'); |
| |
| d = ctx.getImageData(505, 450, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '70'); |
| |
| d = ctx.getImageData(450, 405, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '69'); |
| </script> |
| <script src="../../resources/js-test-post.js"></script> |
| </body> |
| </html> |
