SetDIBitsToDevice

The SetDIBitsToDevice function sets the pixels in the specified rectangle on the device that is associated with the destination device context using color data from a device-independent bitmap (DIB).

int SetDIBitsToDevice(

HDC hdc,	// handle of device context
int XDest,	// x-coordinate of upper-left corner of dest. rect.
int YDest,	// y-coordinate of upper-left corner of dest. rect.
DWORD dwWidth,	// source rectangle width
DWORD dwHeight,	// source rectangle height
int XSrc,	// x-coordinate of lower-left corner of source rect.
int YSrc,	// y-coordinate of lower-left corner of source rect.
UINT uStartScan,	// first scan line in array
UINT cScanLines,	// number of scan lines
CONST VOID *lpvBits,	// address of array with DIB bits
CONST BITMAPINFO *lpbmi,	// address of structure with bitmap info.
UINT fuColorUse	// RGB or palette indices
);

Parameters

hdc

Identifies the device context.

XDest

Specifies the x-coordinate, in logical units, of the upper-left corner of the destination rectangle.

YDest

Specifies the y-coordinate, in logical units, of the upper-left corner of the destination rectangle.

dwWidth

Specifies the width, in logical units, of the DIB.

dwHeight

Specifies the height, in logical units, of the DIB.

XSrc

Specifies the x-coordinate, in logical units, of the lower-left corner of the DIB.

YSrc

Specifies the y-coordinate, in logical units, of the lower-left corner of the DIB.

uStartScan

Specifies the starting scan line in the DIB.

cScanLines

Specifies the number of DIB scan lines contained in the array pointed to by the lpvBits parameter.

lpvBits

Points to DIB color data stored as an array of bytes.

lpbmi

Points to a BITMAPINFO structure that contains information about the DIB.

fuColorUse

Specifies whether the bmiColors member of the BITMAPINFO structure contains explicit red, green, blue (RGB) values or indices into a palette. The fuColorUse parameter must be one of the following values:

Value	Meaning
DIB_PAL_COLORS	The color table consists of an array of 16-bit indices into the currently selected logical palette.
DIB_RGB_COLORS	The color table contains literal RGB values.

Return Values

If the function succeeds, the return value is the number of scan lines set.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

Optimal bitmap drawing speed is obtained when the bitmap bits are indices into the system palette.

Applications can retrieve the system palette colors and indices by calling the GetSystemPaletteEntries function. After the colors and indices are retrieved, the application can create the DIB. For more information about the system palette, see Colors.

The origin of a bottom-up DIB is the lower-left corner of the bitmap; the origin of a top-down DIB is the upper-left corner.

To reduce the amount of memory required to set bits from a large device-independent bitmap on a device surface, an application can band the output by repeatedly calling SetDIBitsToDevice, placing a different portion of the bitmap into the lpvBits array each time. The values of the uStartScan and cScanLines parameters identify the portion of the bitmap contained in the lpvBits array.

The SetDIBitsToDevice function returns an error if it is called by a process that is running in the background while a full-screen MS-DOS session runs in the foreground.

See Also

BITMAPINFO, GetSystemPaletteEntries, SetDIBits, StretchDIBits

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