SetDIBits

The SetDIBits function sets the pixels in a bitmap using the color data found in the specified device-independent bitmap (DIB).

int SetDIBits(

HDC hdc,	// handle of device context
HBITMAP hbmp,	// handle of bitmap
UINT uStartScan,	// starting scan line
UINT cScanLines,	// number of scan lines
CONST VOID *lpvBits,	// array of bitmap bits
CONST BITMAPINFO *lpbmi,	// address of structure with bitmap data
UINT fuColorUse	// type of color indices to use
);

Parameters

hdc

Identifies a device context.

hbmp

Identifies the bitmap that is to be altered using the color data from the specified DIB.

uStartScan

Specifies the starting scan line for the device-independent color data in the array pointed to by the lpvBits parameter.

cScanLines

Specifies the number of scan lines found in the array containing device-independent color data.

lpvBits

Points to the DIB color data, stored as an array of bytes. The format of the bitmap values depends on the biBitCount member of the BITMAPINFO structure pointed to by the lpbmi parameter.

lpbmi

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

fuColorUse

Specifies whether the bmiColors member of the BITMAPINFO structure was provided and, if so, whether bmiColors contains explicit red, green, blue (RGB) values or palette indices. 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 logical palette of the device context identified by the hdc parameter.
DIB_RGB_COLORS	The color table is provided and contains literal RGB values.

Return Values

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

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, see System Palette.

The device context identified by the hdc parameter is used only if the DIB_PAL_COLORS constant is set for the fuColorUse parameter; otherwise it is ignored.

The bitmap identified by the hbmp parameter must not be selected into a device context when the application calls this function.

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

See Also

GetDIBits, GetSystemPaletteEntries, BITMAPINFO

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