/irc-logs / w3c / #html-wg / 2007-12-14 / end

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  1. # Session Start: Fri Dec 14 00:00:00 2007
  2. # Session Ident: #html-wg
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  48. # [13:54] * Philip will hold off on "canvas shadows should not be optional" until there's more than one implementation of them
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  51. # [13:58] <mjs> is there really only one?
  52. # [13:59] <Philip> There's a patch which adds shadows to Mozilla (which I wrote), but that was after the FF3 feature freeze so it wasn't included
  53. # [13:59] <Philip> and I'm not aware of any other shadow implementations
  54. # [14:01] <Philip> (...other than WebKit)
  55. # [14:01] <mjs> see, I was about to make a test case to make sure I wasn't insane
  56. # [14:02] <Philip> See http://philip.html5.org/tests/canvas/suite/tests/index.2d.shadow.html if you want test cases :-)
  57. # [14:03] <Philip> (Hmm, Opera (which doesn't do shadows at all) still scores 25% on there...)
  58. # [14:05] <hsivonen> stepping through the XML parser in debugger I always wonder whether I should have rolled my own or used Xerces as the basis instead of Ælfred...
  59. # [14:05] <mjs> no, I was just pretty sure that the Safari implemenation of canvas did shadows (and that this was the reason it was in the spec) so I was briefly confused when you said an experimental Mozilla patch was the only implementation
  60. # [14:06] <Philip> mjs: Ah, sorry, the Safari one is burned into my mind sufficiently that I didn't think to mention it explicitly :-)
  61. # [14:06] <hsivonen> huh? shadows before dashed stroking???
  62. # [14:07] <Philip> hsivonen: Web 2.0 needs shadows, not dashes!
  63. # [14:07] <hsivonen> Philip: you are right, of course. dashes are *so* 1988
  64. # [14:07] <Philip> roundedRect(x, y, w, h, cornerRadius) would be nice too
  65. # [14:08] <mjs> (Safari does pass only 68% of those shadow tests)
  66. # [14:09] <mjs> (a lot of the failures seem to be for lame reasons though)
  67. # [14:09] <anne> not a reason not to fix them!
  68. # [14:09] <mjs> 'Failed assertion ctx.shadowColor === 'rgba(0, 255, 0, 0.0)' (got RGBA(0,255, 0,0)[string], expected rgba(0, 255, 0, 0.0)[string])'
  69. # [14:09] <anne> we should make <canvas> interop a bit better so we can focus on introducing more holes in new features such as dashes, rounded corners, text, etc.
  70. # [14:09] <mjs> dunno if I'd lose a lot of sleep over that one
  71. # [14:10] <mjs> yeah, the fact that there's good canvas test suites is a plus
  72. # [14:10] <Philip> mjs: http://bugs.webkit.org/show_bug.cgi?id=15266 is the most significant bug
  73. # [14:10] <Philip> http://bugs.webkit.org/show_bug.cgi?id=15265 is the only other one I bothered reporting
  74. # [14:11] <Philip> You could argue about what "bug" means when the spec doesn't actually specify the behaviour at all, but I'll stick with my definition for now since I think it makes sense :-)
  75. # [14:12] <Philip> (where "my definition" is http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2007-June/011799.html )
  76. # [14:12] <mjs> if I wanted to fix canvas compliance bugs I probably wouldn't start with the shadow stuff
  77. # [14:12] <hsivonen> anne: did you write internal subset support on top of html5lib?
  78. # [14:13] <hsivonen> DTDs are the main reason not to make a copy of the Validator.nu HTML parser and turn in into an XML parser
  79. # [14:13] <anne> the XML5 parser is based on the same code structre as html5lib but that's it
  80. # [14:13] <Philip> mjs: That sounds sensible, since there's nobody to interoperate with yet
  81. # [14:16] <mjs> I can't tell what is going on in your shadow gradient examples here: http://philip.html5.org/demos/canvas/shadows/various.html
  82. # [14:16] <mjs> (the rest look reasonably ok to me)
  83. # [14:18] <Philip> mjs: If you look in e.g. Firefox, you can see what the unshadowed gradient looks like
  84. # [14:18] <Philip> i.e. a square, with some transparent bits around the lower right
  85. # [14:19] <Philip> so the shadow should be the same shape and the same pattern of transparentness, but offset down/right
  86. # [14:19] <Philip> but if I remember correctly, it gets clipped to the source rectangle or something instead of being offset properly
  87. # [14:20] <mjs> my FF3 beta fails to render the gradients at all
  88. # [14:20] <mjs> (launching FF2)
  89. # [14:21] <Philip> mjs: How old beta? Might be https://bugzilla.mozilla.org/show_bug.cgi?id=402527
  90. # [14:21] <Philip> (assuming you're using a Mac)
  91. # [14:21] <mjs> so we are drawing a solid shadow under the whole gradient filled area I guess?
  92. # [14:22] <mjs> that won't be fun to fix, it is probably a CoreGraphics bug so we might have to hand-code shadow drawing for gradients
  93. # [14:22] <Philip> I can't remember exactly what Safari was doing, and it looks like I don't have screenshots of it
  94. # [14:22] <hsivonen> eww... Ælfred has even pointless recursion where a loop would make sense...
  95. # [14:23] <Philip> Are bugs ever fun to fix? :-)
  96. # [14:23] <mjs> I prefer fixing bugs that are in code where I actually work on
  97. # [14:25] <Philip> Incidentally, it seems quite trivial to DOS the browser by rendering something with a really high shadowBlur
  98. # [14:26] * hsivonen is trying to fix bugs in code I'm at least the fourth maintainer of...
  99. # [14:26] <Philip> (I clamped shadowBlur to 2000 (i.e. ~190 pixel radius) for Mozilla)
  100. # [14:27] <mjs> I think we set a limit too, at least for text-shadow
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  102. # [14:30] * Philip tries to find a runnable version of Safari somewhere
  103. # [14:48] <Philip> http://software.hixie.ch/utilities/js/live-dom-viewer/?%3C!DOCTYPE%20html%3E%0D%0A%3Cbody%20onload%3Dwith(document.getElementById('c').getContext('2d'))%7BshadowColor%3D'yellow'%3BshadowBlur%3D10000%3BfillStyle%3D'blue'%3BfillRect(100%2C50%2C100%2C50)%7D%3E%0D%0A%3Ccanvas%20id%3Dc%3E%3C%2Fcanvas%3E
  104. # [14:48] <Philip> mjs: That uses a few hundred megabytes of memory and freezes for longer than I can be bothered waiting (i.e. at least a minute)
  105. # [14:50] * Philip has no idea why that's so inefficient - it should be O(shadowBlur) memory and O(sqrt(shadowBlur)) time, I think
  106. # [14:51] * Philip guesses that's CoreGraphics's fault
  107. # [14:51] <mjs> so yeah, I'm not gonna click that link :-)
  108. # [14:51] <mjs> but thanks
  109. # [14:51] <mjs> we should probably limit the blur
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  115. # [16:00] <Philip> http://glimr.rubyforge.org/cake/canvas.html
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The end :)