串接zxing 與 QCAR

一，在EAGLView中，加入下列function，目的是把qcarImage轉成uiimage
- (UIImage *)createUIImage:(const QCAR::Image *)qcarImage

{
   
    int width = qcarImage->getWidth();
   
    int height = qcarImage->getHeight();
   
    int bitsPerComponent = 8;
   
    int bitsPerPixel = QCAR::getBitsPerPixel(QCAR::RGB888);
   
    int bytesPerRow = qcarImage->getBufferWidth() * bitsPerPixel / bitsPerComponent;
   
    CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
   
    CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault | kCGImageAlphaNone;
   
    CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
   
   
   
    CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, qcarImage->getPixels(), QCAR::getBufferSize(width, height, QCAR::RGB888), NULL);
   
   
   
    CGImageRef imageRef = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorSpaceRef, bitmapInfo, provider, NULL, NO, renderingIntent);
   
    UIImage *image = [[UIImage imageWithCGImage:imageRef] retain];
   
   
   
    CGDataProviderRelease(provider);
   
    CGColorSpaceRelease(colorSpaceRef);
   
    CGImageRelease(imageRef);
   
   
   
    return image;
   
}
二，在- (void)renderFrameQCAR中加入下列code
//ZXing
    ZxingQRcode* zxing = [ZxingQRcode shareInstance];
    QCAR::setFrameFormat(QCAR::RGB888, true);
    QCAR::Frame frame = state.getFrame();
    for (int i = 0; i < frame.getNumImages(); i++)
    {
        const QCAR::Image *qcarImage = frame.getImage(i);
        if (qcarImage->getFormat() == QCAR::RGB888)
        {
            UIImage *image = [self createUIImage:qcarImage];
            [zxing captureWithUIImage:image];
        }
    }

三，其中ZxingQRcode是我自己寫的一個class用來控制zxing做解碼之後的動作
這裡要注意的是，QCAR中和zxing中各有一個OverlayView，如果整合的時候不做處理，就會相衝突導致無法compile成功。
(Apple Mach-O Linker Error clang: error: linker command failed with exit code 1)


P.S.在第二項中setFrameFormat是為了用來取得RGB編碼的畫面，
關於畫面編碼QCAR提供了下面幾種選項

/// Pixel encoding types

enum PIXEL_FORMAT {

    UNKNOWN_FORMAT = 0,         ///< Unknown format - default pixel type for

                                ///< undefined images

    RGB565 = 1,                 ///< A color pixel stored in 2 bytes using 5

                                ///< bits for red, 6 bits for green and 5 bits

                                ///< for blue

    RGB888 = 2,                 ///< A color pixel stored in 3 bytes using

                                ///< 8 bits each

    GRAYSCALE = 4,              ///< A grayscale pixel stored in one byte

    YUV = 8,                    ///< A color pixel stored in 12 or more bits

                                ///< using Y, U and V planes

    RGBA8888 = 16,              ///< A color pixel stored in 32 bits using 8 bits

                                ///< each and an alpha channel.

};