URGENT! RenderOffScreen replacement in Gecko 1.9

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yakobom

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Sep 2, 2008, 2:26:58 PM9/2/08
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Hi guys,
I desperately need you help.
I need the option to get an image into my own texture. Before GECKO
1.9, we did it using RenderOffScreen in the ViewManager.
Can someone please send me some instructions or a link to somewhere
that explains it ...
We have tried several things, including RenderDocument on PresShell,
but bumped into a lot of link errors.
We need quick assistance, and not only code lines.
Please - any assistance will be very appreciated.

Thanks,
yakobom

Babele Dunnit

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Sep 3, 2008, 5:27:32 AM9/3/08
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Hi Yako, still me... lets join forces, maybe someone hear us (nobody
answered my similar question 3 weeks ago).

Right now, after reading THIS thread:

http://groups.google.com/group/mozilla.dev.embedding/browse_thread/thread/57e07c2f2109a36f

I understood that THIS is important:

http://developer.mozilla.org/en/Migrating_from_Internal_Linkage_to_Frozen_Linkage

this should fix the HELL of a problems I have with strings and
linkage... but I hope that everything I used (apart from string) was
not moved into internals because I digged quite deep in FF code to do
what we are doing.

Also, THIS seems to be interesting (also cited in the thread above) :

http://developer.mozilla.org/en/XPCOM_Glue

For everything else, I mean the REAL RenderOffscreen problem, I hope
someone will send some snippet... they also moved to Cairo, so no more
"internal" rendering context... I believe the code must be changed
quite a lot.

You know? I will check Google Chrome code VERY SOON... :)

steve lu

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Sep 3, 2008, 2:31:58 PM9/3/08
to dev-em...@lists.mozilla.org
Hi,

Follow the yellow brick road along <nsIDOMCanvasRenderingContext2D>, and
you shall find what you looking for.

-steve

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Babele Dunnit

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Oct 6, 2008, 6:11:46 AM10/6/08
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Hello everybody,

I managed to get to the pixels. Here cometh the snippet. DISCLAIMER:
this works for me, and it's probably still buggy. I still have to
understand if and where I have to use smart pointers, and I know never
free memory, and a lot of other stuff that must be fixed. All I know
is that "textureBuffer" points to a memory zone that I can
subsequently render in a OpenGL texture, so I can tell it works.

Ciao,
Aaron/Babele

void EmbeddedBrowser::GrabWindow()
{

nsCOMPtr<nsIDOMWindow> domWindow;
nsresult rv = mWebBrowser-
>GetContentDOMWindow(getter_AddRefs(domWindow));
assert(NS_SUCCEEDED(rv) && domWindow);

nsCOMPtr<nsICanvasRenderingContextInternal> context;
context = do_CreateInstance("@mozilla.org/content/canvas-rendering-
context;1?id=2d", &rv);

assert(NS_SUCCEEDED(rv) && context);

context->SetDimensions(512, 512);
context->SetCanvasElement(nsnull);

nsCOMPtr<nsIDOMCanvasRenderingContext2D> domCanvas;
domCanvas = do_QueryInterface(context, &rv);
assert(NS_SUCCEEDED(rv) && domCanvas);

rv = domCanvas->DrawWindow(domWindow, 0, 0, 512, 512,
NS_LITERAL_STRING("rgb(0,0,0)"));
assert (NS_SUCCEEDED(rv));

gfxASurface* DOMRenderedSurface = NULL;
rv = context->GetThebesSurface(&DOMRenderedSurface);
assert (NS_SUCCEEDED(rv) && DOMRenderedSurface);

assert(DOMRenderedSurface->GetType() ==
gfxASurface::SurfaceTypeWin32);
assert(DOMRenderedSurface->GetContentType() ==
gfxASurface::CONTENT_COLOR_ALPHA);

nsRefPtr<gfxImageSurface> imgSurface = new
gfxImageSurface(gfxIntSize(512,
512),gfxImageSurface::ImageFormatARGB32);
assert(imgSurface);

gfxContext* dcontext = new gfxContext(imgSurface);
assert(dcontext);

dcontext->SetOperator(gfxContext::OPERATOR_SOURCE);
dcontext->SetSource(DOMRenderedSurface);
dcontext->Paint();

PRUint32* imageData = (PRUint32*)imgSurface->Data();
textureBuffer = (char*) imageData;

}

André Pedralho

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Oct 15, 2008, 11:35:29 PM10/15/08
to Babele Dunnit, dev-em...@lists.mozilla.org
Hi Aaron and Babele,

I used to set the widgetDamageRectInPixels coordinates in nsViewManager
before use it in CopyOffScreenBits, how can I do it on the new architecture?
It used to be something like:

widgetDamageRectInPixels.x = valueX;
widgetDamageRectInPixels.y = valueY;
localcx->CopyOffScreenBits(ds, 0, 0, widgetDamageRectInPixels,
NS_COPYBITS_USE_SOURCE_CLIP_REGION);

Can you help me?

Thanks in advance,

Andre Pedralho

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--
André Pedralho

Christian Sell

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Feb 13, 2014, 12:02:42 PM2/13/14
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doesn't seem to work (or even compile) with recent (>=24) XULRunner versions
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