Bug 17442 – Correct Windows Cairo (GraphicsContext) implementation

• Component: WebKit Misc.
• Status: RESOLVED FIXED

[Brent Fulgham]

My initial Cairo implementation on Windows had a few mistakes:

1.  It improperly put some "GraphicsContextPlatformPrivate" code in the general Windows implementation.
2.  The higher-level calls need to call the platform-private windows calls that keep the WorldTransform in sync.
3.  The concatCTM method didn't even do anything with the passed transform -- a clear bug!
4.  SVG does not rotate or scale properly in the current implementation.

[Brent Fulgham]

Created attachment 19237 [details]
Initial patch based on discussions with Alp Toker

[Adam Roben (:aroben)]

Comment on attachment 19237 [details]
Initial patch based on discussions with Alp Toker

Looks like you have some strange indenting in the ChangeLog.

r=me

[Matt Lilek]

Committed revision 30500.

[Mark Rowe (bdash)]

This patch completely broke the non-Windows case.  Unconditional calls such as:

m_data->save();

are using method which are declared:

#if PLATFORM(WIN)
     // On Windows, we need to update the HDC for form controls to draw in the right place.
     void save();


I'm going to roll this out so it can be addressed.

[Mark Rowe (bdash)]

Rolled out in r30500.

[Brent Fulgham]

It looks like I screwed up the patch by omitting the non-Windows case.  I have a building GTK Webkit on a Linux box, which I will use to test this patch again.

[Brent Fulgham]

Created attachment 19287 [details]
Updated patch with missing non-Windows stanza

[Brent Fulgham]

Yes, I agree that the #if/def is perhaps clunky, but it's the approach used in the CoreGraphics implementations on Mac and WIndows.

I have now built and run this patch on Windows, Mac, and GTK+.  Current patch was generated against today's SVN head.

[Darin Adler]

Comment on attachment 19287 [details]
Updated patch with missing non-Windows stanza

ChangeLog has some tabs in it. When working on WebKit patches please make sure your editor is set in a mode that won't add tabs.

r=me

[Matt Lilek]

Committed revision 30533.

[Matt Lilek]

(In reply to comment #5)
> Rolled out in r30500.
> 

It was actually rolled out in r30513.

[Robert Blaut]

(In reply to comment #11)
> (In reply to comment #5)
> > Rolled out in r30500.
> > 
> 
> It was actually rolled out in r30513.
> 

So why the bug is resolved as FIXED?

[Matt Lilek]

(In reply to comment #12)
> (In reply to comment #11)
> > (In reply to comment #5)
> > > Rolled out in r30500.
> > > 
> > 
> > It was actually rolled out in r30513.
> > 
> 
> So why the bug is resolved as FIXED?
> 

Because I recommitted in r30533 (comment 10) after Brent tweaked it.  I just happened to see that comment and mentioned it for the sake of correctness.