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<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept xml:lang="en" id="GUID-294E84BB-65D0-5275-848E-1960B201A371"><title>Creating and Drawing to an Off-Screen Bitmap</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>This topic provides an example that shows the creation of a bitmap, the creation of an off-screen graphics device and graphics context for it, and the use of that graphics context to draw to the bitmap. Once a graphics context has been established for the bitmap, any of the GDI drawing functions can be used on the bitmap, as if it were the more common graphics context—the screen. </p> <codeblock id="GUID-E7A1651B-4F87-5156-9CDE-F8205323DB8E" xml:space="preserve">// Create a bitmap to be used off-screen.

CFbsBitmap* offScreenBitmap = new (ELeave) CFbsBitmap();

CleanupStack::PushL(offScreenBitmap);

User::LeaveIfError(offScreenBitmap->Create(TSize(100,100),EColor256));

// Create an off-screen device and context.

CGraphicsContext* bitmapContext=NULL;

CFbsBitmapDevice* bitmapDevice = CFbsBitmapDevice::NewL(offScreenBitmap);

CleanupStack::PushL(bitmapDevice);

User::LeaveIfError(bitmapDevice->CreateContext(bitmapContext));

CleanupStack::PushL(bitmapContext);

// Draw something on the bitmap.

TRect rect(0,0,100,100);

bitmapContext->SetBrushColor(KRgbRed);

bitmapContext->SetBrushStyle(CGraphicsContext::ESolidBrush);

bitmapContext->DrawRect(rect); // a filled red rectangle

// Now do what you want with it, such as blitting to the screen.

gc.BitBlt(TPoint(20,20),offScreenBitmap);

// Cleanup.

CleanupStack::PopAndDestroy(3);