ios - AIR ネイティブ拡張と UIView

Question

iOS のデバイス カメラにアクセスするためのネイティブ拡張機能を使って実験を行っています。目標は、AS3 の BitmapData で UIView のストリームを作成することです。

mView=[[UIView alloc]initWithFrame:[UIScreen mainScreen].bounds];
AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:mSession];
previewLayer.frame = mView.bounds;
[mView.layer addSublayer:previewLayer];

これは、UIView でカメラ プレビューを含むサブレイヤーを追加し、次に ANE コントローラーで追加するコードの一部です。

FREObject drawViewToBitmap(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[]) { // FREBitmapData bmd に書き込むための AS3 bitmapData オブジェクトを取得します。int32_t _id;

//get CCapture object that contains the camera interface...
CCapture* cap;
FREGetObjectAsInt32(argv[0], &_id);

cap = active_cams[_id];

//When start's to capture
if(cap && captureCheckNewFrame(cap))
{

UIView* myView = getView(cap); //<--- Here I get the mView from the code above
FREAcquireBitmapData(argv[1], &bmd);
// Draw the UIView to a UIImage object. myView is a UIView object
// that exists somewhere in our code. It can be any view.
UIGraphicsBeginImageContext(myView.bounds.size);
[myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

// Now we'll pull the raw pixels values out of the image data
CGImageRef imageRef = [image CGImage];
NSUInteger width = CGImageGetWidth(imageRef);
NSUInteger height = CGImageGetHeight(imageRef);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

// Pixel color values will be written here
unsigned char *rawData = (unsigned char*)malloc(height * width * 4);
NSUInteger bytesPerPixel = 4;
NSUInteger bytesPerRow = bytesPerPixel * width;
NSUInteger bitsPerComponent = 8;
CGContextRef context = CGBitmapContextCreate(rawData, width, height,
                                             bitsPerComponent, bytesPerRow, colorSpace,
                                             kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colorSpace);
CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
CGContextRelease(context);

// Pixels are now in rawData in the format RGBA8888
// We'll now loop over each pixel write them into the AS3 bitmapData memory
int x, y;

// There may be extra pixels in each row due to the value of
// bmd.lineStride32, we'll skip over those as needed
int offset = bmd.lineStride32 - bmd.width;
int offset2 = bytesPerRow - bmd.width*4;
int byteIndex = 0;
uint32_t *bmdPixels = bmd.bits32;

// NOTE: In this example we are assuming that our AS3 bitmapData and our
// native UIView are the same dimensions to keep things simple.
for(y=0; y<bmd.height; y++) {
    for(x=0; x<bmd.width; x++, bmdPixels ++, byteIndex += 4) {
        // Values are currently in RGBA8888, so each colour
        // value is currently a separate number
        int red = (rawData[byteIndex]);
        int green = (rawData[byteIndex + 1]);
        int blue = (rawData[byteIndex + 2]);
        int alpha = (rawData[byteIndex + 3]);

        // Combine values into ARGB32
        * bmdPixels = (alpha << 24) | (red << 16) | (green << 8) | blue;
    }

    bmdPixels += offset;
    byteIndex += offset2;
}

// free the the memory we allocated
free(rawData);
// Tell Flash which region of the bitmapData changes (all of it here)
FREInvalidateBitmapDataRect(argv[0], 0, 0, bmd.width, bmd.height);
// Release our control over the bitmapData
FREReleaseBitmapData(argv[0]);
}
return NULL;

問題はこの行にあります: image = UIGraphicsGetImageFromCurrentImageContext();、画像は幅/高さ = 0 で、残りのコードは行 "int red = (rawData[byteIndex]);" で失敗します。問題？

関数 drawViewToBitmap は、AS3 側でサイズ変更するのに非常にコストがかかる大きな静止画像の代わりに、github/inspirit の ANE で使用しようとしている Tyler Egeto のコードです。

ありがとう！