macOS Cannot include video when rendering a WebView to CGImageRef

[tannyhot]

Hello,

Please guys, I need your help on this. I'm using this code to render the contents of any NSView:

+ (CGImageRef)allocCGImageRefFromView:(NSView*)theView
{
NSBitmapImageRep * bm = [NSBitmapImageRep alloc];
    NSBitmapImageRep * newBM = nil;
[theView lockFocus];
    [bm retain];
newBM = [bm initWithFocusedViewRect:[theView bounds]];
 
    [newBM autorelease];
[theView unlockFocus];
 
//[bm retain];// data provider will release this
NSInteger     rowBytes, width, height;
 
rowBytes = [bm bytesPerRow];
width = [bm pixelsWide];
height = [bm pixelsHigh];
 
CGDataProviderRef provider = CGDataProviderCreateWithData([bm autorelease], [bm bitmapData], rowBytes * height, BitmapReleaseCallback );
CGColorSpaceRef colorspace = CGColorSpaceCreateWithName( kCGColorSpaceGenericRGB );
CGBitmapInfo    bitsInfo = kCGImageAlphaPremultipliedLast;
 
CGImageRef img = CGImageCreate( width, height, 8, 32, rowBytes, colorspace, bitsInfo, provider, NULL, NO, kCGRenderingIntentDefault );
 
CGDataProviderRelease( provider );
CGColorSpaceRelease( colorspace );
 
return img;
}

However, when I tried this with WebView, it seems that it can only render simple content (i.e. buttons, images, text) and it cannot render any video that's embedded in a website. Did I miss something here? Or this kind of behavior functions as designed by Apple?


Thanks!