SetDIBits

SetDIBits is a function in the Windows API (Application Programming Interface) used to draw a bitmap directly into a device context. It takes a handle to a device context, a handle to a device-independent bitmap (DIB), and various other parameters that specify how the bitmap should be drawn. The function is primarily used for drawing bitmaps that are not already in the format of the target device.

The SetDIBits function copies pixel data from a DIB into a specified section of a device context. It supports different bitmap formats, including 24-bit RGB bitmaps and those with color palettes. The function requires information such as the starting point of the drawing operation on the device, the dimensions of the bitmap, and the number of scan lines to copy. It can also handle operations like stretching or compressing the bitmap to fit the target area.

When SetDIBits is called, it examines the DIB's format and, if necessary, converts the pixel data to match the format of the device context before writing it. This conversion process ensures that the bitmap is displayed correctly on the target display or printer. The function returns the number of scan lines successfully copied, or zero if an error occurred. It is a fundamental tool for graphics programming in Windows, enabling applications to render custom images and graphics efficiently.