Re: - [NSBitmapImageRep cacheDisplayInRect:toBitmapImageRep:] produces empty image
Re: - [NSBitmapImageRep cacheDisplayInRect:toBitmapImageRep:] produces empty image
- Subject: Re: - [NSBitmapImageRep cacheDisplayInRect:toBitmapImageRep:] produces empty image
- From: "Adam R. Maxwell" <email@hidden>
- Date: Wed, 19 Aug 2009 17:45:10 -0700
On Aug 19, 2009, at 2:50 PM, Ben Lachman wrote:
I have an offscreen window containing a WebView that I'm using to
generate web previews. My current code works beautifully and looks
like this:
NSView *view = previewWebView.mainFrame.frameView.documentView;
I do something similar, although using the frameView directly (and
drawing to a CGContext). Do you really need to draw the documentView?
However, I'm really only interested in the first page or so of
data. So I figure I just make targetRect smaller by making the
height the same as the width (if it's larger) prior to creating the
image rep, like so:
if( NSHeight(targetRect) > NSWidth(targetRect) )
targetRect.size.height = NSWidth(targetRect);
This either produces an empty image rep or a chunk of the image the
size of the intersection of the visible area of view and the rect
you'd get if targetRect was aligned to the bottom left (however view
is flipped). Manipulating targetRect doesn't seem to help.
Have you tried sending -layout to the documentView before drawing?
Safari 4.0.3 broke my code (I started getting blank image), and that
was the workaround I came up with.
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