On 25.11.2016 at 16:29 David Duncan wrote:
> The fastest method without OpenGL is to work with CGImage directly
> and assign the image as the contents of a CALayer.
> This will engage CoreAnimation to use the hardware to scale the
> image, but is still not quite as fast as OpenGL for the same task.
> Roughly you'll want to look at CGImageCreate and
> CGDataProviderCreate (there are a number of variants of the latter).
Thanks, I've just tried this and the performance seems reasonably well.
I don't know how fast direct OpenGL would be but it looks like the
CALayer approach is already sufficiently fast enough.
But just to make sure I implemented this in the right way: Assigning the
image as the contents of my view's CALayer means that I shouldn't draw
in drawRect() at all but just do the following whenever I need to draw
a new frame:
myImage = CGImageCreate(...);
view.layer.contents = (id) myImage;
CGImageRelease(myImage);
Is that right? I have to create a new CGImageRef for every frame I draw
because CGImages are immutable objects, right?
And to scale the whole shebang from 320x240 to full screen I just set
view.transform = CGAffineTransformScale(CGAffineTransformIdentity, scalex,
scaley);
Or is there a better way to force a view into full screen by scaling?
--
Best regards,
Andreas Falkenhahn mailto:andr...@falkenhahn.com
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