的答案我的上述問題是本下面。所以沒有更多的opengl或glGrab。使用最適合Mac OSX的優化。這不包括用於捕捉鼠標指針也代碼,但我相信,如果你已經登陸這個頁面上,你很聰明足以通過自己看着辦吧。或者,如果有人讀這知道解決辦法則是你的機會來幫助博愛:)另外該代碼返回CVPixelBufferRef。您可以選擇發回無論是CGImageRef甚至字節流,因爲它是,它只是調整自己的喜好。 :
void swizzleBitmap(void *data, int rowBytes, int height) {
int top, bottom;
void * buffer;
void * topP;
void * bottomP;
void * base;
top = 0;
bottom = height - 1;
base = data;
buffer = malloc(rowBytes);
while (top < bottom) {
topP = (void *)((top * rowBytes) + (intptr_t)base);
bottomP = (void *)((bottom * rowBytes) + (intptr_t)base);
bcopy(topP, buffer, rowBytes);
bcopy(bottomP, topP, rowBytes);
bcopy(buffer, bottomP, rowBytes);
++top;
--bottom;
}
free(buffer);
}
CVImageBufferRef grabViaOpenGL() {
int bytewidth;
CGImageRef image = CGDisplayCreateImage(kCGDirectMainDisplay); // Main screenshot capture call
CGSize frameSize = CGSizeMake(CGImageGetWidth(image), CGImageGetHeight(image)); // Get screenshot bounds
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:NO], kCVPixelBufferCGImageCompatibilityKey,
[NSNumber numberWithBool:NO], kCVPixelBufferCGBitmapContextCompatibilityKey,
nil];
CVPixelBufferRef pxbuffer = NULL;
CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, frameSize.width,
frameSize.height, kCVPixelFormatType_32ARGB, (CFDictionaryRef) options,
&pxbuffer);
CVPixelBufferLockBaseAddress(pxbuffer, 0);
void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(pxdata, frameSize.width,
frameSize.height, 8, 4*frameSize.width, rgbColorSpace,
kCGImageAlphaNoneSkipLast);
CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),
CGImageGetHeight(image)), image);
bytewidth = frameSize.width * 4; // Assume 4 bytes/pixel for now
bytewidth = (bytewidth + 3) & ~3; // Align to 4 bytes
swizzleBitmap(pxdata, bytewidth, frameSize.height); // Solution for ARGB madness
CGColorSpaceRelease(rgbColorSpace);
CGImageRelease(image);
CGContextRelease(context);
CVPixelBufferUnlockBaseAddress(pxbuffer, 0);
return pxbuffer;
}