https://bugs.documentfoundation.org/show_bug.cgi?id=96892
--- Comment #7 from Martin <[email protected]> --- Here's what I did to find the bug, and some things I noticed along the way. First I took Julien's files and uncompressed the streams using pdftk. As expected, some numbers are now given to three places, e.g. at the very beginning: stream 0.1 w q 0 0.1 595.2 841.8 re became: stream 0.1 w q 0 0.138 595.275 841.861 re But the rest is less encouraging, e.g. the first long data line: 63.8 756.6 64.1 756.1 64.2 755.9 c 64.3 755.7 64.4 755.5 64.5 755.3 c became: 63.8 756.6 64.5 756.15 64.15 755.95 c 64.3 755.75 64.4 755.55 64.5 755.3 c It looks like the "with patch" numbers are only rounded to the nearest 1/20. More on that later. You can also see that the third number changed quite dramatically, 64.1 -> 64.5 -- and this is what led me to the bug. I extracted all the numbers for one path and compared "without patch" and "with patch". The results are attached. I found that |difference| > 0.05 only happened in the following cases: # without patch with patch difference 59.1 59.5 0.40 60.1 60.5 0.40 61.1 61.5 0.40 62.1 62.5 0.40 63.1 63.5 0.40 64.1 64.5 0.40 65.1 65.5 0.40 66.1 66.5 0.40 67.1 67.5 0.40 754 754.5 0.50 755 755.5 0.50 756 756.5 0.50 757 757.5 0.50 758 758.5 0.50 759 759.5 0.50 760 760.5 0.50 761 761.5 0.50 762 762.5 0.50 Once you've seen the bug, the explanation is obvious. 0.40 vs 0.50 - the 6x are x-coordinates, the 7xx are y-coordinates. In general the y-coordinates decreased by 0.05, x-coordinates increased by 0.05: 58.6 58.6 0.00 58.7 58.65 -0.05 58.9 58.85 -0.05 58.9 58.9 0.00 59.1 59.1 0.00 : 753.4 753.45 0.05 753.5 753.5 0.00 753.7 753.7 0.00 753.9 753.9 0.00 753.9 753.95 0.05 754 754 0.00 I believe that the difference comes from this line in appendPoint(): nValue = pointToPixel(getHeight()) - aPoint.Y(); or a similar line elsewhere. -- You are receiving this mail because: You are the assignee for the bug.
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