September 2008 - webkit-dev - lists.webkit.org

Transparency on GTK/DirectFB
by Weber, Bernd 23 Feb '09

23 Feb '09

Hi, I'm trying to get Webkit running with transparency on GTK/DirectFB. I can see that it does create transparency effects with the background color of an HTML page, defining, eg. opacity:0.5 or rgba(255,0,0,0.5) in a div. The holy grail however would be to achieve transparency to the underlying desktop, by defining "transparent" as the background color. I'm not sure whether Webkit, especially with GTK/DirectFB, supports this right now. If so, how can I activate it? If not can someone point me to the code so I can implement this feature myself?? Any help is greatly appreciated! -Bernd ----------------------------------------- This message (including any attachments) may contain confidential information intended for a specific individual and purpose. If you are not the intended recipient, delete this message. If you are not the intended recipient, disclosing, copying, distributing, or taking any action based on this message is strictly prohibited.

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Qt's default webkit user agent
by Benjamin Meyer 01 Dec '08

01 Dec '08

As it is today Qt's default user agent (in qwebpage.cpp) is hard coded to: "Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en) AppleWebKit/523.15 (KHTML, like Gecko) Safari/419.3 Qt" Seeing as this library will be used inside of many other applications it makes sense to include by default at least the application name/version when they are set. QCoreApplication gives us several strings which can be used. applicationName, applicationVersion, organizationDomain, organizationName But at a bigger question, what should be included (or not included) with the default user agent? Is there docs anywhere that suggest what webkit library users should use as their user agent string? -Benjamin Meyer

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proxying thru curl
by Giri Rao 01 Dec '08

01 Dec '08

Hello, I have set up curl to go through a simple http proxy that I have written. I have a .curlrc with the following line in it: --proxy=http://<myhost>:<myport>/ When I invoke curl on command line, it goes thru the set proxy. However, when I launch webkit through GtkLauncher, it does not seem to go through the proxy at all. Is my understanding wrong in that webkit uses curl to fetch content? How do I make webkit go through my proxy? Any help is appreciated. Thanks Giri

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webkit documentation
by Jack Wootton 25 Nov '08

25 Nov '08

Hi all, I am mainly interested in S60 WebKit, however due to the project seeming to be in complete disarray to those not working for Nokia, I've decided to focus my efforts on the WebKit branch from which S60 WebKit started. I understand this to be Tiger 10.4.7 (it was one of the few pieces of information about S60 WebKit that I could actually find - although it will almost certainly turn out to be incorrect :p): http://trac.webkit.org/browser/releases/Apple/Tiger/Mac%20OS%20X%20Update%2… Where can I find documentation for this code? The question here is, other than trawling through code, where can I find documentation that explain it's implementation? Cheers, Jack

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setTimeout as browser speed throttle
by Mike Belshe 23 Oct '08

23 Oct '08

Hi, One of the differences between Chrome and Safari is that Chrome sets the setTimeout clamp to 1ms as opposed to 10ms. This means that if the application writer requests a timer of less than 10ms, Chrome will allow it, whereas Safari will clamp the minimum timeout to 10ms. The reason we did this was to minimize browser delays when running graphical javascript applications. This has been a concern for some, so I wanted to bring it up here and get an open discussion going. My hope is to lower or remove the clamp over time. To demonstrate the benefit, here is one test case which benefits from removing the setTimeout clamp. Chrome gets about a ~4x performance boost by reducing the setTimeout clamp. This programming pattern in javascript is very common. http://www.belshe.com/test/sort/sort.html<http://www.belshe.com/test/sort/sort.html> One counter argument brought up is a claim that all other browsers use a 10ms clamp, and this might cause incompatibilities. However, it turns out that browsers already use widely varying values. We also really haven't seen any incompatibilities due to this change. It is true that having a lower clamp can provide an easy way for web developers to accidentally spin the CPU, and we have seen one high-profile instance of this. But of course spinning the CPU can be done in javascript all by itself :-) Here is a summary of the minimum timeout for existing browsers (you can test your browser with this page: http://www.belshe.com/test/timers.html )<http://www.belshe.com/test/timers.html> Safari for the mac: 10ms Safari for windows: 15.6ms Firefox: 10ms or 15.6ms, depending on whether or not Flash is running on the system IE : 15.6ms Chrome: 1ms (future - remove the clamp?) So here are a couple of options: 1) Remove or lower the clamp so that javascript apps can run substantially faster. 2) Keep the clamp and let them run slowly :-) Thoughts? It would be great to see Safari and Chrome use the same clamping values. Thanks, Mike

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Safari and complex script rendering
by Paul Pedriana 18 Oct '08

18 Oct '08

>> ... this is not a WebCore issue, so there is nothing you can do in WebCore to fix it. When I look at WebCore's WidthIterator::advance function, it doesn't seem to me to be savvy to complex script. It looks to me like it walks through a Unicode string and replaces character clusters with individual glyphs. This approach works for most scripts but not complex scripts such as Arabic and Devanagari. The problem, as you may well be aware, is that there are many OpenType-directed substitutions, ligations, and "un-ligations." This is unrelated to Arabic's RTL nature unrelated to simply contextual alternates resulting from cursiveness. It seems to me that complex script would have to be supported by something other than WidthIterator::advance (is it?). If WebCore (or WebKit in general) supports complex script correctly then I wonder what I am missing regarding the above statements. Paul

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HTML5 Application Cache
by Michael Nordman 15 Oct '08

15 Oct '08

What is the status of the work-in-progress around the HTML5 AppCache that is in the repository? Is anybody actively working on that now? I'm interested in incorporating support for this feature into Chrome is why I'm asking. Michael

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Re: [webkit-dev] WebKit memory management?
by Zoltan Horvath 01 Oct '08

01 Oct '08

Hi, our goal is to change standard malloc to tcmalloc under linux-qt port but we couldn't solve operator new and delete problems. As we see Paul's ( https://bugs.webkit.org/show_bug.cgi?id=20422 ) solution can solve this, therefore if the community accepts this change then we would gladly help to replace all new and delete operators to the new ones. Regards, Zoltan Horvath

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Win32 App
by Jason Hullinger 30 Sep '08

30 Sep '08

In Cocoa I have made a command line application that init's a WebView, then calls, stringByEvaluatingJavaScriptFromString, however, I'm trying to get this to work in Windows. I've compiled WebKit and added a new Win32 command line project, however, I'm always getting back "null" when calling stringByEvaluatingJavaScriptFromString. Below is the source, and I've tried a variety of different things to eval ("1 + 1", "var foo = 1", etc.), and again, it's always null. Thanks for any information, ~/Jason Hullinger src snippet: int _tmain(int argc, _TCHAR* argv[]) { HRESULT hr; hr = OleInitialize(NULL); if(FAILED(hr)){ printf("failed to CoInit\n"); return -1; } IWebView *webView; hr = CoCreateInstance(CLSID_WebView, 0, CLSCTX_ALL, IID_IWebView, (void **)&webView); if(FAILED(hr)){ printf("failed to create a webView\n"); return -1; } BSTR result = L""; BSTR script = L"function hello(){ return 'hello'; } hello();"; webView->stringByEvaluatingJavaScriptFromString(script, &result); printf("result: %S\nHit return to exit", result); char temp[1024]; gets(temp); return 0; }

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OS for WebKit development
by Zan Dobersek 30 Sep '08

30 Sep '08

I'm getting interested in working on WebKit, MathML implementation, to be a bit more precise. However, I'm wondering if there are any needs or benefits of using a specific operating system when considering WebKit development. At the moment, I'm using Linux and building both GTK and Qt port of WebKit. Are these OK for doing something like implementing MathML or is it necessary for me to switch to Windows or Mac OS X? Thanks in advance.

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