It's either a sanctioned way to draw, or it's not. The fact that they even draw
in a loop is more telling, because you can't do that in drawRect, either.
I'm processing videos by passing a single frame "through" a composition, then
taking that result and writing it to a new QTMovie. The view is just to give
some feedback to the user while this is going on.
(It's terribly slow, getting a single frame out of the input movie at a time,
but I've gotten no response on the QT list as to why.)
--
Rick
On May 29, 2010, at 23:56:21, vade wrote:
> Thats note is really more, bare bones, get something on the screen. Most dev
> examples either subclass drawRect, or use a timer/CVdisplay link to draw
> multiple frames at a video like framerate. If you only need to draw one
> frame, that method could work, but re-sizing your view you require a redraw,
> etc. What is your goal with this app?
>
> On May 30, 2010, at 2:53 AM, Rick Mann wrote:
>
>> Yet the docs clearly show the QCRenderer being initialized and then
>> immediately drawing to the view, which you wouldn't do in a drawRect method,
>> so what gives?
>>
>> On May 29, 2010, at 23:52:50, vade wrote:
>>
>>> "As with other views, you use your OpenGL view’s drawRect: method to draw
>>> the content of your view. When your drawRect: method is invoked, the
>>> environment is automatically configured for drawing using the OpenGL
>>> graphics context associated with your view."
>>>
>>> "To use an OpenGL view in your program, you create a subclass of
>>> NSOpenGLView and add that view to your window, either programmatically or
>>> using Interface Builder."
>>>
>>> file:///Developer/Documentation/DocSets/com.apple.adc.documentation.AppleSnowLeopard.CoreReference.docset/Contents/Resources/Documents/documentation/Cocoa/Conceptual/CocoaDrawingGuide/QuartzOpenGL/QuartzOpenGL.html#//apple_ref/doc/uid/TP40003290-CH211-BAAECJDJ
>>>
>>> On May 30, 2010, at 1:46 AM, Rick Mann wrote:
>>>
>>>>
>>>> On May 29, 2010, at 17:17:26, vade wrote:
>>>>
>>>>> Is that code in your NSopenGLView, and are you rendering in drawRect?
>>>>> when is that actually happening? In init? In awake from nib? You probably
>>>>> want to move the rendering to drawRect in your NSOpenGLView, but without
>>>>> more details its hard to know.
>>>>
>>>> No, I do this call once, when I create the renderer (which is after the
>>>> user chooses a couple of files for processing).
>>>>
>>>> This is straight from the QCRenderer reference doc overview. Nothing tells
>>>> me I have to subclass the view and do this in the drawRect method, and I
>>>> don't think that is necessarily the right way to do this (is it?).
>>>>
>>>>>
>>>>> On May 29, 2010, at 8:07 PM, Rick Mann wrote:
>>>>>
>>>>>> I tried my first stab at rendering a simple composition with QCRenderer:
>>>>>>
>>>>>> NSOpenGLContext* glCTX = self.outputFrameView.openGLContext;
>>>>>> if (mQCRenderer == nil)
>>>>>> {
>>>>>> NSOpenGLPixelFormat* pixelFormat =
>>>>>> self.outputFrameView.pixelFormat;
>>>>>> mQCRenderer = [[QCRenderer alloc] initWithOpenGLContext: glCTX
>>>>>> pixelFormat: pixelFormat
>>>>>> file: mCompositionPath];
>>>>>> }
>>>>>>
>>>>>> bool success = [mQCRenderer renderAtTime: 0.0 arguments: nil];
>>>>>> [glCTX flushBuffer];
>>>>>>
>>>>>> But nothing appeared in my GL view. success was true.
>>>>>>
>>>>>> Any suggestions? Thanks!
>>>>>>
>>>>>> --
>>>>>> Rick
>>>>>>
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>>>>>
>>>>
>>>
>>
>
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