| <!DOCTYPE html> |
| <html> |
| <head> |
| <script src="../../resources/js-test-pre.js"></script> |
| </head> |
| <body> |
| <script> |
| description("Test the handling of non-integer source coordinates in getImageData()."); |
| |
| ctx = document.createElement('canvas').getContext('2d'); |
| |
| function dimensionsShouldBe(sx, sy, sw, sh, width, height) |
| { |
| imageData = ctx.getImageData(sx, sy, sw, sh); |
| debug('getImageData(' + sx + ', ' + sy + ', ' + sw + ', ' + sh + ')'); |
| shouldBe('imageData.width', width + ''); |
| shouldBe('imageData.height', height + ''); |
| } |
| |
| // Basic integer values |
| dimensionsShouldBe( 0, 0, 20, 10, 20, 10); |
| |
| // Source point is not an integer |
| dimensionsShouldBe( .1, .2, 20, 10, 21, 11); |
| dimensionsShouldBe( .9, .8, 20, 10, 21, 11); |
| |
| // Size is not an integer |
| dimensionsShouldBe( 0, 0, 19.9, 9.9, 20, 10); |
| dimensionsShouldBe( 0, 0, 19.1, 9.1, 20, 10); |
| |
| // Width straddles a pixel boundary |
| dimensionsShouldBe( .9, 0, .2, 10, 2, 10); |
| |
| // Basic integer negative values |
| dimensionsShouldBe( -1, -1, 20, 10, 20, 10); |
| |
| // Non-integer negative values |
| dimensionsShouldBe(-1.1, 0, 20, 10, 21, 10); |
| dimensionsShouldBe(-1.9, 0, 20, 10, 21, 10); |
| </script> |
| <script src="../../resources/js-test-post.js"></script> |
| </body> |
| </html> |
