Re: QTKit and NSImage not playing nice
Re: QTKit and NSImage not playing nice
- Subject: Re: QTKit and NSImage not playing nice
- From: Michael Watson <email@hidden>
- Date: Wed, 21 Mar 2007 22:12:38 -0400
It's an implementation detail of QuickTime. In order to render to a
movie flle, you need an off-screen graphics world (GWorld) in which
to draw the frames. Otherwise, they get dumped, one after the other,
into the first compatible graphics context QT finds, which ends up
being a flipped context in a window somewhere.
Use QTNewGWorld() to create an off-screen GWorld after calling -
[QTMovie movieWithQuickTimeMovie:disposeWhenDone:error:] during your
movie initialization. After checking for success, use SetMovieGWorld
() to set the GWorld for the movie.
--
m-s
On 21 Mar, 2007, at 21:17, Alan Smith wrote:
Hi all,
I'm trying to create a QTMovie from PDF data. The movie will scroll
down the PDF at a set speed with a set frame height. The only trouble
I'm having is at the end of creating the movie the first frame is
drawn in the upper-left hand corner of my screen. I'm compositing each
image just before adding it to the movie, if I use a file from disk
the odd behavior described above doesn't occur. Why is that???
Any thoughts and suggestions are welcome, this is a real stumper.
Peace, Alan
Here is my code:
for (i = 0; i <= numFrames; i++)
{
NSLog(@"i = %i", i);
//NSImage *frame = [[NSImage alloc] initWithContentsOfFile: path
to a file];
NSImage *frame = [[NSImage alloc] initWithSize: frameSize];
rect = NSMakeRect(0.0, imageYOrigin, frameSize.width,
frameSize.height);
[frame lockFocus];
[masterImage compositeToPoint: NSMakePoint(0, 0) fromRect: rect
operation: NSCompositeCopy];
[frame unlockFocus];
[movie addImage: frame forDuration: curTime withAttributes:
imageCompression];
NSLog(@"Added image");
[frame release];
imageYOrigin -= currentSpeed;
}
--
// Quotes from yours truly -------------------------
"You don't forget, you just don't remember."
"Maturity resides in the mind."
"Silence is the Universe's greatest gift."
"When the World realizes that religion really is unnecessary, then it
shall evolve."
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