GLPaint save image

Question

I\'m trying to develop a complex painting application on the iPhone. I\'m currently drawing using Quartz (e.g. CGContext...). Unfortunately the Quartz overhead is

Answer 1

void SaveScreenImage()

{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
CGImageRef cgImage = UIGetScreenImage();
void *imageBytes = NULL;
if (cgImage == NULL) {
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
imageBytes = malloc(320 * 480 * 4);
CGContextRef context = CGBitmapContextCreate(imageBytes, 320, 480, 8, 320 * 4, colorspace, kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Big);
    CGColorSpaceRelease(colorspace);
for (UIWindow *window in [[UIApplication sharedApplication] windows]) {
        CGRect bounds = [window bounds];
        CALayer *layer = [window layer];
        CGContextSaveGState(context);
        if ([layer contentsAreFlipped]) {
            CGContextTranslateCTM(context, 0.0f, bounds.size.height);
            CGContextScaleCTM(context, 1.0f, -1.0f);
        }
[layer renderInContext:(CGContextRef)context];
        CGContextRestoreGState(context);
    }
    cgImage = CGBitmapContextCreateImage(context);
    CGContextRelease(context);
}
UIImage *image=[UIImage imageWithCGImage:cgImage];
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil); 
[pool release];
}

This code will save as you see on the screen.But it maybe private api.