INFO: Background Colors Affect BitBlt() from Mono to Color

ID: Q41464

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) versions 3.1, 3.0
Microsoft Win32 Application Programming Interface (API), used with:
- Microsoft Windows NT, versions 3.5, 3.51
- Microsoft Windows 95

SUMMARY

When using BitBlt() to convert a monochrome bitmap to a color bitmap, GDI transforms all white bits (1) to the background color of the destination device context (DC). GDI transforms all black bits (0) to the text (or foreground) color of the destination DC.

When using BitBlt() to convert a color bitmap to a monochrome bitmap, GDI sets to white (1) all pixels that match the background color of the source DC. All other bits are set to black (0).

These features are mentioned in the BitBlt() documentation. manual.

Additional query words: 3.00 3.10 3.50 4.00 win16sdk

Keywords : kbNTOS350 kbNTOS351 kbSDKWin32 kbWinOS310 kbWinOS95 kbDSupport kbWinOS300
Version : WINDOWS:3.0,3.1,95; winnt:3.5,3.51
Platform : WINDOWS winnt
Issue type : kbinfo