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FindFacesInGWorld.mm

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//
//  FindFacesInGWorld.mm
//      Contains:       Implementation file for the FindFacesInGWorld class
//
//      Written by:    Ian Fasel -- added Face Detector (MPISearch) support
//
//      Copyright:      ©  2003 Machine Perception Laboratory 
//                      University of California San Diego.
//
//      Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
//
//    1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
//    2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
//    3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 

#import "FindFacesInGWorld.h"

static RImage<float> grayImg;

static inline double difftv(const struct timeval &t1, const struct timeval &t0)
{ return( (t1.tv_sec -t0.tv_sec )*1.0 +(t1.tv_usec-t0.tv_usec)*1e-6); }

static inline void square(unsigned char *data, Square it, int w){
    typedef struct{ unsigned char a, r, g, b;} argbPixel;
    unsigned char val;
    argbPixel *pixeldata = (argbPixel *)data;
    for(int k=0; k<3;++k){
        val = ((k % 2) ? 0 : 255);
        int top = it.y+k;
        int bot = it.y+it.size-k;
        int left = it.x+k;
        int right = it.x+it.size-k;
        argbPixel* p = pixeldata + top*w+left;
        for(int i=left; i<right; ++i){
            p->r = val; p->g=val; p->b=val; p++;
        }
        p = pixeldata + bot*w+left;
        for(int i=left; i<right; ++i){
            p->r = val; p->g=val; p->b=val; p++;
        }
        p = pixeldata + top*w+left;
        for(int i=top; i<bot; ++i){
            p->r = val; p->g=val; p->b=val; p+=w;
        }
        p = pixeldata + top*w+right-1;
        for(int i=top; i<bot; ++i){
            p->r = val; p->g=val; p->b=val; p+=w;
        }
    }
}


@implementation FindFacesInGWorld
- (FindFacesInGWorld *)init
{
    mpi = new MPISearchFaceDetector;
    initialized = false;
    subsampling = 2;
    return [super init];
}

- (void)InitializeStreamWithWidth:(int)w Height:(int)h
{
    //NSLog(@"w = %d, h = %d", w, h);
    mpi->initStream(w/subsampling, h/subsampling);
    grayImg.setSize(w/subsampling, h/subsampling);
    initialized = true;
}

- (void)FindFaces:(GWorldPtr)gWorldPtr
{
    PixMapHandle        pixMapHandle = NULL;
    Ptr                 pixBaseAddr = nil;

    //struct timeval tv_now, last, tv_a, tv_b;
    //double totalTime, msgTime;
    //gettimeofday(&last,0);

    NSAssert(gWorldPtr != nil, @"nil gWorldPtr");

    // Lock the pixels
    pixMapHandle = GetGWorldPixMap(gWorldPtr);
    if (pixMapHandle)
    {
        Rect    portRect;
        int     portWidth, portHeight;

        NSAssert(LockPixels(pixMapHandle) != false, @"LockPixels returns false");
    
        GetPortBounds(gWorldPtr, &portRect);
        portWidth = (portRect.right - portRect.left);
        portHeight = (portRect.bottom - portRect.top);

        if(!initialized)
            [self InitializeStreamWithWidth:portWidth Height:portHeight];
        float   *theData = grayImg.array;
        int     pixmapRowBytes;
        int     srcRowByte,srcRowIndex;    
        pixBaseAddr = (unsigned char *)GetPixBaseAddr(pixMapHandle);
        int sm1 = (subsampling - 1)*4, sm2 = subsampling * 4;
        if (pixBaseAddr)
        {
            pixmapRowBytes = GetPixRowBytes(pixMapHandle);
            //float one_over_765 = 1.0f/(3.0f * 255.0f);
            for (srcRowIndex=0; srcRowIndex< portHeight; srcRowIndex+=subsampling)
            {
                float *dst = theData + (srcRowIndex/subsampling) * (portWidth/subsampling);
                unsigned char *src = pixBaseAddr + srcRowIndex * pixmapRowBytes;
                //unsigned char a,r,g,b,r2,g2,b2,r3,g3,b3;
                for (srcRowByte = 0; srcRowByte < portWidth; srcRowByte+=(subsampling*3))
                {
                    *dst++ = (float)(src[1] + src[2] + src[3]);
                    src+=sm2;
                    *dst++ = (float)(src[1] + src[2] + src[3]);
                    src+=sm2;
                    *dst++ = (float)(src[1] + src[2] + src[3]);
                    src+=sm2;
                }
            }
        }
        FaceBoxList faces;
        mpi->search(grayImg, faces);
        list<Square>::iterator it = faces.begin();
        faces.simplify(0.1f);
        if(faces.size() != 0) {
            while(!faces.empty( )){
                Square face = faces.front(); 
                faces.pop_front(); 
                face.x*=subsampling; 
                face.y*=subsampling; 
                face.size*=subsampling; 
                //NSLog(@"really at (%d, %d, %d)", face.x, face.y, face.size);
                square(pixBaseAddr, face, pixmapRowBytes/4);
            }
        }
    }

    NSAssert(pixMapHandle != NULL, @"null pixMapHandle");
    NSAssert(pixBaseAddr != nil, @"nil pixBaseAddr");

    if (pixMapHandle)
    {
        UnlockPixels(pixMapHandle);
    }
    //gettimeofday(&tv_now,0);
    //totalTime = difftv(tv_now, last);
    //NSLog(@"\tThe search took %g seconds.", totalTime);

}
@end

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