58100 2011-04-07 17:16:31 -0700 1px box-shadow looks ugly 2011-04-28 23:41:58 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) All OS X 10.5 RESOLVED FIXED InRadar P2 Normal --- 59782 1 simon.fraser simon.fraser ariya.hidayat krit mrobinson simon.fraser oldest_to_newest 381869 0 simon.fraser 2011-04-07 17:16:31 -0700 Box-shadow with a 1px blur radius looks ugly, and rather different from a CG 1-px shadow. 381871 1 88740 simon.fraser 2011-04-07 17:16:45 -0700 Created attachment 88740 Testcase 382284 2 mrobinson 2011-04-08 09:22:17 -0700 I wonder if this is due to the fact that ShadowBlur/ContextShadow does not yet support fractional blur radii. 393700 3 simon.fraser 2011-04-27 12:02:50 -0700 I'm sure it is. 393726 4 simon.fraser 2011-04-27 12:55:37 -0700 <rdar://problem/9076329> 393796 5 simon.fraser 2011-04-27 14:06:22 -0700 The code is buggy for 1px radii. For an input of: 000 000 000 000 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 000 000 000 000 the results are 043 070 088 079 061 069 112 141 127 098 096 154 194 175 135 105 169 212 191 148 105 169 212 191 148 105 169 212 191 148 096 154 194 175 135 078 126 159 143 111 060 098 123 111 086 which is not symmetrical. For radii >=2 this problem does not happen. 394138 6 krit 2011-04-27 20:11:20 -0700 I could compare the both shadows (ContextShadow and ShadowBlur) and the result of ContextShadow looked more sane. It also did not have big problems with 0-1px shadows. Is there a difference in the implementation? 394493 7 simon.fraser 2011-04-28 09:53:10 -0700 Context Shadows's code gives: Blur source: 000 000 000 000 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 000 000 000 000 Blur result: 086 111 123 098 060 111 143 159 126 078 135 175 194 154 096 148 191 212 169 105 148 191 212 169 105 148 191 212 169 105 135 175 194 154 096 098 127 141 112 069 061 079 088 070 043 which is still incorrect, but different (not sure why). 394551 8 simon.fraser 2011-04-28 10:51:46 -0700 If I add 1px of padding so that the edge alpha is always zero, the issue goes away. I'll do that. 394667 9 91539 simon.fraser 2011-04-28 12:45:31 -0700 Created attachment 91539 Patch 395067 10 91539 krit 2011-04-28 20:35:11 -0700 Comment on attachment 91539 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=91539&action=review Can you please check if the pixel results for feDropShadow changed (they should) and update them? They are located at LayoutTests/svg/filter/feDropShadow.svg and LayoutTests/dynamic-updates/ r- for the test and the and the missing result updates. The fix itself looks good to me. If I should be wrong with tests just add a comment. > LayoutTests/fast/box-shadow/single-pixel-shadow.html:15 > + -webkit-transform-origin: -1px -1px; > + -webkit-transform: scale(20); Do you really want a pixelation here? On SVG we try to avoid this and transform all affected objects to devicespace and apply shadows afterwards. So we always have a goof looking shadow. This definitely does not belong to this big. But if it gets changed in the future, the text would be useless. Have you checked what Firefox or Opera are doing? But I don't have an idea how to make a pixel with it. What about canvas? Is canvas using shadow? If you draw a shadow on canvas it should be pixelated on scaling, also in the future, no? 395076 11 91539 krit 2011-04-28 20:48:54 -0700 Comment on attachment 91539 Patch Talked with Simon on IRC. We don't see a way to have constant results on shadows across platforms as long as not all platforms are using ShadowBlur. Even if we get resolution independent shadows, we should see if the shadow is broken, since the shadow radius gets scaled as well. Simon updates filter results on landing. 395090 12 simon.fraser 2011-04-28 21:08:00 -0700 http://trac.webkit.org/changeset/85299 88740 2011-04-07 17:16:45 -0700 2011-04-07 17:16:45 -0700 Testcase small-shadow.html text/html 269 simon.fraser PCFET0NUWVBFIGh0bWw+Cgo8aHRtbD4KPGhlYWQ+CiAgPHN0eWxlIHR5cGU9InRleHQvY3NzIiBt ZWRpYT0ic2NyZWVuIj4KICAgIC5ib3ggewogICAgICBoZWlnaHQ6IDEwcHg7CiAgICAgIHdpZHRo OiAxMHB4OwogICAgICBib3JkZXI6IDFweCBzb2xpZCBibGFjazsKICAgICAgYm94LXNoYWRvdzog MTBweCAxMHB4IDFweCBibGFjazsKICAgIH0KICA8L3N0eWxlPgo8L2hlYWQ+Cjxib2R5PgogIDxk aXYgY2xhc3M9ImJveCI+CiAgPC9kaXY+CjwvYm9keT4KPC9odG1sPgo= 91539 2011-04-28 12:45:31 -0700 2011-04-28 20:48:53 -0700 Patch bug-58100-20110428124530.patch text/plain 25210 simon.fraser U3VidmVyc2lvbiBSZXZpc2lvbjogODUwNjIKZGlmZiAtLWdpdCBhL0xheW91dFRlc3RzL0NoYW5n ZUxvZyBiL0xheW91dFRlc3RzL0NoYW5nZUxvZwppbmRleCA3ODkwZTI0MmRjNjJmZDRmMGViMzlh NTkwY2ExMDY1YjgyNzQ5MDVhLi5hMTVlNTQ0MDRlNDI1YWVkNzcwYWM4ZGJhZWFlZTY2MDUyOGE3 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