GetStretchBltMode function (wingdi.h)
The GetStretchBltMode function retrieves the current stretching mode. The stretching mode defines how color data is added to or removed from bitmaps that are stretched or compressed when the StretchBlt function is called.
Syntax
int GetStretchBltMode(
[in] HDC hdc
);
Parameters
[in] hdc
A handle to the device context.
Return value
If the function succeeds, the return value is the current stretching mode. This can be one of the following values.
| Value | Description |
|---|---|
| BLACKONWHITE | Performs a Boolean AND operation using the color values for the eliminated and existing pixels. If the bitmap is a monochrome bitmap, this mode preserves black pixels at the expense of white pixels. |
| COLORONCOLOR | Deletes the pixels. This mode deletes all eliminated lines of pixels without trying to preserve their information. |
| HALFTONE | Maps pixels from the source rectangle into blocks of pixels in the destination rectangle. The average color over the destination block of pixels approximates the color of the source pixels. |
| STRETCH_ANDSCANS | Same as BLACKONWHITE. |
| STRETCH_DELETESCANS | Same as COLORONCOLOR. |
| STRETCH_HALFTONE | Same as HALFTONE. |
| STRETCH_ORSCANS | Same as WHITEONBLACK. |
| WHITEONBLACK | Performs a Boolean OR operation using the color values for the eliminated and existing pixels. If the bitmap is a monochrome bitmap, this mode preserves white pixels at the expense of black pixels. |
If the function fails, the return value is zero.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | wingdi.h (include Windows.h) |
| Library | Gdi32.lib |
| DLL | Gdi32.dll |