| <!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 drawImage+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) |
| { |
| var evalA; |
| try { |
| evalA = eval(a); |
| } catch(e) { |
| evalA = e; |
| } |
| |
| if (Math.abs(evalA - b) < 10) |
| print("PASS " + a + " is around " + b , "green") |
| else |
| print("FAIL " + a + " is not around " + b + " (actual: " + evalA + ")", "red"); |
| } |
| |
| // Create auxiliary canvas to draw to and create an image from. |
| // This is done instead of simply loading an image from the file system |
| // because that would throw a SECURITY_ERR DOM Exception. |
| var aCanvas = document.createElement('canvas'); |
| aCanvas.setAttribute('width', '50'); |
| aCanvas.setAttribute('height', '50'); |
| var aCtx = aCanvas.getContext('2d'); |
| |
| // Fill the same canvas. |
| aCtx.fillStyle = 'rgba(0, 0, 255, 1)'; |
| aCtx.fillRect(0, 0, 50, 50); |
| |
| // Create the image object to be drawn on the master canvas. |
| var img = new Image(); |
| img.onload = drawImageToCanvasAndCheckPixels; |
| img.src = aCanvas.toDataURL(); // set a data URI of the base64 encoded image as the source |
| |
| // Create master canvas. |
| var canvas = document.createElement('canvas'); |
| document.body.appendChild(canvas); |
| canvas.setAttribute('width', '1000'); |
| canvas.setAttribute('height', '1000'); |
| var ctx = canvas.getContext('2d'); |
| |
| function drawImageToCanvasAndCheckPixels() { |
| ctx.scale(2, 2); |
| ctx.shadowOffsetX = 100; |
| ctx.shadowOffsetY = 100; |
| ctx.fillStyle = 'rgba(0, 0, 255, 1)'; |
| |
| ctx.shadowColor = 'rgba(255, 0, 0, 1.0)'; |
| ctx.drawImage(img, 50, 50); |
| |
| ctx.shadowColor = 'rgba(255, 0, 0, 0.3)'; |
| ctx.drawImage(img, 50, 150); |
| |
| ctx.shadowColor = 'rgba(255, 0, 0, 1.0)'; |
| ctx.shadowBlur = 10; |
| ctx.drawImage(img, 150, 50); |
| |
| ctx.shadowColor = 'rgba(255, 0, 0, 0.3)'; |
| ctx.drawImage(img, 150, 150); |
| |
| checkPixels(); |
| } |
| |
| var d; // imageData.data |
| |
| function checkPixels() { |
| |
| // Verify solid shadow. |
| d = ctx.getImageData(205, 205, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBe('d[3]', '255'); |
| |
| d = ctx.getImageData(295, 295, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBe('d[3]', '255'); |
| |
| d = ctx.getImageData(205, 295, 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, 401, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '76'); |
| |
| d = ctx.getImageData(290, 401, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '76'); |
| |
| d = ctx.getImageData(290, 498, 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, 205, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '83'); |
| |
| d = ctx.getImageData(501, 205, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '83'); |
| |
| d = ctx.getImageData(500, 300, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '53'); |
| |
| // Verify blurry alpha shadow. |
| d = ctx.getImageData(398, 405, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '24'); |
| |
| d = ctx.getImageData(405, 501, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '24'); |
| |
| d = ctx.getImageData(405, 501, 1, 1).data; |
| shouldBe('d[0]', '255'); |
| shouldBe('d[1]', '0'); |
| shouldBe('d[2]', '0'); |
| shouldBeAround('d[3]', '24'); |
| } |
| </script> |
| <script src="../../resources/js-test-post.js"></script> |
| </body> |
| </html> |
