/*
 * The following code loads a BITMAP object from a file and then
 * fills a box in a DC.
 *
 * You should note that the code assigns 'bmType' field of the BITMAP object directly.
 */
{
 int tox = 800, toy = 800;
 int count;
 BITMAP bitmap;
 unsigned int start_tick, end_tick;

 /* Load the bitmap from the file. */
 if (LoadBitmap (hdc, &bitmap, "res/icon.bmp"))
 return;

 bitmap.bmType = BMP_TYPE_ALPHACHANNEL;

 /* Fill a box with the bitmap with alpha channel. */
 start_tick = GetTickCount ();
 count = 1000;
 while (count--) {
 tox = rand() % 800;
 toy = rand() % 800;

 /* Set a random alpha channel. */
 bitmap.bmAlpha = rand() % 256;
 /* Fill the box. */
 FillBoxWithBitmap (hdc, tox, toy, 0, 0, &bitmap);
 }
 end_tick = GetTickCount ();
 TellSpeed (hwnd, start_tick, end_tick, "Alpha Blended Bitmap", 1000);

 bitmap.bmType = BMP_TYPE_ALPHACHANNEL | BMP_TYPE_COLORKEY;
 /* Set the color key (the transparent pixel) of the bitmap. */
 bitmap.bmColorKey = GetPixelInBitmap (&bitmap, 0, 0);

 /* Fill a box with the bitmap with alpha channel and color key. */
 start_tick = GetTickCount ();
 count = 1000;
 while (count--) {
 tox = rand() % 800;
 toy = rand() % 800;

 /* Set a random alpha channel. */
 bitmap.bmAlpha = rand() % 256;
 /* Fill the box. */
 FillBoxWithBitmap (hdc, tox, toy, 0, 0, &bitmap);
 }
 end_tick = GetTickCount ();
 TellSpeed (hwnd, start_tick, end_tick, "Alpha Blended Transparent Bitmap", 1000);

 UnloadBitmap (&bitmap);
}