void CvvImage::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 );
}
}
void CvvImage::Show( HDC dc, int x, int y, int w, int h, int from_x, int from_y )
{
if( m_img && m_img->depth == IPL_DEPTH_8U )
{
uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
BITMAPINFO* bmi = (BITMAPINFO*)buffer;
int bmp_w = m_img->width, bmp_h = m_img->height;
FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin );
from_x = MIN( MAX( from_x, 0 ), bmp_w - 1 );
from_y = MIN( MAX( from_y, 0 ), bmp_h - 1 );
int sw = MAX( MIN( bmp_w - from_x, w ), 0 );
int sh = MAX( MIN( bmp_h - from_y, h ), 0 );
SetDIBitsToDevice(
dc, x, y, sw, sh, from_x, from_y, from_y, sh,
m_img->imageData + from_y*m_img->widthStep,
bmi, DIB_RGB_COLORS );
}
}
CV_IMPL void
cvShowImage( const char* name, const CvArr* arr )
{
CV_FUNCNAME( "cvShowImage" );
__BEGIN__;
CvWindow* window;
SIZE size = { 0, 0 };
int channels = 0;
void* dst_ptr = 0;
const int channels0 = 3;
int origin = 0;
CvMat stub, dst, *image;
bool changed_size = false; // philipg
if( !name )
CV_ERROR( CV_StsNullPtr, "NULL name" );
window = icvFindWindowByName(name);
if(!window)
{
cvNamedWindow(name, 1);
window = icvFindWindowByName(name);
}
if( !window || !arr )
EXIT; // keep silence here.
if( CV_IS_IMAGE_HDR( arr ))
origin = ((IplImage*)arr)->origin;
CV_CALL( image = cvGetMat( arr, &stub ));
if (window->image)
// if there is something wrong with these system calls, we cannot display image...
if (icvGetBitmapData( window, &size, &channels, &dst_ptr ))
return;
if( size.cx != image->width || size.cy != image->height || channels != channels0 )
{
changed_size = true;
uchar buffer[sizeof(BITMAPINFO) + 255*sizeof(RGBQUAD)];
BITMAPINFO* binfo = (BITMAPINFO*)buffer;
DeleteObject( SelectObject( window->dc, window->image ));
window->image = 0;
size.cx = image->width;
size.cy = image->height;
channels = channels0;
FillBitmapInfo( binfo, size.cx, size.cy, channels*8, 1 );
window->image = SelectObject( window->dc, CreateDIBSection(window->dc, binfo,
DIB_RGB_COLORS, &dst_ptr, 0, 0));
}
cvInitMatHeader( &dst, size.cy, size.cx, CV_8UC3,
dst_ptr, (size.cx * channels + 3) & -4 );
cvConvertImage( image, &dst, origin == 0 ? CV_CVTIMG_FLIP : 0 );
// ony resize window if needed
if (changed_size)
icvUpdateWindowPos(window);
InvalidateRect(window->hwnd, 0, 0);
// philipg: this is not needed and just slows things down
// UpdateWindow(window->hwnd);
__END__;
}