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4/8/2010

In order to fill all or part of a surface with a single color, you can use the IDirectDrawSurface::Bltmethod with the DDBLT_COLORFILL flag. This technique allows you to quickly erase an area or draw a solid-colored background.

Code Example

The following code example fills an entire surface with the color blue, after obtaining the numerical value for blue from the pixel format.

Note:
To make the following code example easier to read, security checking and error handling are not included. This code example should not be used in a release configuration unless it has been modified to include them.

	Copy Code
/* It is assumed that lpDDS is a valid pointer to an IDirectDrawSurface interface. */ HRESULT ddrval; DDPIXELFORMAT ddpf; ddpf.dwSize = sizeof(ddpf); if (SUCCEEDED(lpDSS->GetPixelFormat(&ddpf)) { DDBLTFX ddbltfx; ddbltfx.dwSize = sizeof(ddbltfx); ddbltfx.dwFillColor = ddpf.dwBBitMask; // Pure blue ddrval = lpDDS->Blt( NULL, // Destination is entire surface NULL, // No source surface NULL, // No source rectangle DDBLT_COLORFILL, &ddbltfx); switch(ddrval) { case DDERR_WASSTILLDRAWING: . . . case DDERR_SURFACELOST: . . . case DD_OK: . . . default: } }

Copy Code

/* It is assumed that lpDDS is a valid pointer to 
   an IDirectDrawSurface interface. */
 
HRESULT ddrval;
DDPIXELFORMAT ddpf;
 
ddpf.dwSize = sizeof(ddpf);
if (SUCCEEDED(lpDSS->GetPixelFormat(&ddpf))
{
	DDBLTFX ddbltfx; 
 
	ddbltfx.dwSize = sizeof(ddbltfx); 
	ddbltfx.dwFillColor = ddpf.dwBBitMask; // Pure blue
 
	ddrval = lpDDS->Blt( 
		NULL, 	// Destination is entire surface
		NULL, 	// No source surface
		NULL, 	// No source rectangle
		DDBLT_COLORFILL, &ddbltfx); 
 
	switch(ddrval) 
	{ 
		case DDERR_WASSTILLDRAWING: 
			. 
			. 
			. 
		case DDERR_SURFACELOST: 
			. 
			. 
			. 
		case DD_OK: 
			. 
			. 
			. 
		default: 
} 
}

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Color Fills