User manual - JPEGライブラリマニュアルver.1.10(2012年3月29日)

// ..........

case WM_PAINT:

hdc = BeginPaint( hWnd, &ps );

ShowBitmap( hWnd, hdc, &g_Bitmap );

EndPaint( hWnd, &ps );

break;

}

return FALSE;

}

int ShowBitmap( HWND hWnd, HDC hDC, LPBITMAP bm )

{

BITMAPINFOHEADER InfoHeader;

RECT rec;

double width_tmp;

double height_tmp;

int ShowLine;

// Makes the header of image information

InfoHeader.biSize = (DWORD)sizeof( BITMAPINFOHEADER );

InfoHeader.biWidth = bm->bmWidth;

InfoHeader.biHeight = bm->bmHeight;

InfoHeader.biPlanes = bm->bmPlanes;

InfoHeader.biBitCount = bm->bmBitsPixel;

InfoHeader.biCompression = 0;

InfoHeader.biSizeImage = 0;

InfoHeader.biXPelsPerMeter = 0;

InfoHeader.biYPelsPerMeter = 0;

InfoHeader.biClrUsed = 0;

InfoHeader.biClrImportant = 0;

//Display position calculation

GetClientRect( hWnd, &rec );

width_tmp = rec.right - 20;

height_tmp = width_tmp / ( bm->bmWidth / bm->bmHeight);

// Show the Image

ShowLine = StretchDIBits( hDC, 10, 30, ( int)width_tmp, ( int)height_tmp,

0, 0, bm->bmWidth, bm->bmHeight, bm->bmBits, ( LPBITMAPINFO)&InfoHeader,

DIB_RGB_COLORS, SRCCOPY);

return ShowLine;

}