otherlibs/highgui/image.cpp

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//
// Image.cpp: implementation of the CvvImage class.
//
//////////////////////////////////////////////////////////////////////

#include "_highgui.h"

#if defined __cplusplus && (!defined WIN32 || !defined __GNUC__)

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CvvImage::CvvImage()
{
    m_img = 0;
}

void CvvImage::Destroy()
{
    cvReleaseImage( &m_img );
}

CvvImage::~CvvImage()
{
    Destroy();
}

bool  CvvImage::Create( int w, int h, int bpp, int origin )
{
    const unsigned max_img_size = 10000;

    if( (bpp != 8 && bpp != 24 && bpp != 32) ||
        (unsigned)w >=  max_img_size || (unsigned)h >= max_img_size ||
        (origin != IPL_ORIGIN_TL && origin != IPL_ORIGIN_BL))
    {
        assert(0); // most probably, it is a programming error
        return false;
    }
    
    if( !m_img || Bpp() != bpp || m_img->width != w || m_img->height != h )
    {
        if( m_img && m_img->nSize == sizeof(IplImage))
            Destroy();
    
        /* prepare IPL header */
        m_img = cvCreateImage( cvSize( w, h ), IPL_DEPTH_8U, bpp/8 );
    }

    if( m_img )
        m_img->origin = origin == 0 ? IPL_ORIGIN_TL : IPL_ORIGIN_BL;

    return m_img != 0;
}

void  CvvImage::CopyOf( CvvImage& image, int desired_color )
{
    IplImage* img = image.GetImage();
    if( img )
    {
        CopyOf( img, desired_color );
    }
}


#define HG_IS_IMAGE(img)                                                  \
    ((img) != 0 && ((const IplImage*)(img))->nSize == sizeof(IplImage) && \
    ((IplImage*)img)->imageData != 0)


void  CvvImage::CopyOf( IplImage* img, int desired_color )
{
    if( HG_IS_IMAGE(img) )
    {
        int color = desired_color;
        CvSize size = cvGetSize( img ); 

        if( color < 0 )
            color = img->nChannels > 1;

        if( Create( size.width, size.height,
                    (!color ? 1 : img->nChannels > 1 ? img->nChannels : 3)*8,
                    img->origin ))
        {
            cvConvertImage( img, m_img, 0 );
        }
    }
}


bool  CvvImage::Load( const char* filename, int desired_color )
{
    IplImage* img = cvLoadImage( filename, desired_color );
    if( !img )
        return false;

    CopyOf( img, desired_color );
    cvReleaseImage( &img );

    return true;
}


bool  CvvImage::LoadRect( const char* filename,
                          int desired_color, CvRect r )
{
    if( r.width < 0 || r.height < 0 ) return false;

    IplImage* img = cvLoadImage( filename, desired_color );
    if( !img )
        return false;

    if( r.width == 0 || r.height == 0 )
    {
        r.width = img->width;
        r.height = img->height;
        r.x = r.y = 0;
    }

    if( r.x > img->width || r.y > img->height ||
        r.x + r.width < 0 || r.y + r.height < 0 )
    {
        cvReleaseImage( &img );
        return false;
    }

    /* truncate r to source image */
    if( r.x < 0 )
    {
        r.width += r.x;
        r.x = 0;
    }
    if( r.y < 0 )
    {
        r.height += r.y;
        r.y = 0;
    }

    if( r.x + r.width > img->width )
        r.width = img->width - r.x;

    if( r.y + r.height > img->height )
        r.height = img->height - r.y;
    
    cvSetImageROI( img, r );
    CopyOf( img, desired_color );

    cvReleaseImage( &img );
    return true;
}


bool  CvvImage::Save( const char* filename )
{
    if( !m_img )
        return false;
    cvSaveImage( filename, m_img );
    return true;
}



#ifdef WIN32

void  CImage::DrawToHDC( HDC hDCDst, RECT* pDstRect ) 
{
    if( pDstRect && m_img && m_img->depth == IPL_DEPTH_8U && m_img->imageData )
    {
        uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
        BITMAPINFO* bmi = (BITMAPINFO*)buffer;
        int bmp_w = m_img->width, bmp_h = m_img->height;

        CvRect roi = cvGetImageROI( m_img );
        CvRect dst = RectToCvRect( *pDstRect );

        if( roi.width == dst.width && roi.height == dst.height )
        {
            Show( hDCDst, dst.x, dst.y, dst.width, dst.height, roi.x, roi.y );
            return;
        }
    
        if( roi.width > dst.width )
        {
            SetStretchBltMode(
                   hDCDst,           // handle to device context
                   HALFTONE );
        }
        else
        {
            SetStretchBltMode(
                   hDCDst,           // handle to device context
                   COLORONCOLOR );
        }

        FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin );

        ::StretchDIBits(
            hDCDst,
            dst.x, dst.y, dst.width, dst.height,
            roi.x, roi.y, roi.width, roi.height,
            m_img->imageData, bmi, DIB_RGB_COLORS, SRCCOPY );
    }
}

#endif

void  CvvImage::Fill( int color )
{
    cvSet( m_img, cvScalar(color&255,(color>>8)&255,(color>>16)&255,(color>>24)&255) );
}

#endif

/* End of file. */