GetStretchBltMode
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4/8/2010
This 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(
HDC hdc
);
Parameters
- hdc
[in] 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. |
BILINEAR |
Linearly interpolates color values in both the x and y directions. This mode only works when stretching the source, not shrinking. This mode only works for the raster operations SRCCOPY, SRCAND, and SRCPAINT (see Ternary Raster Operations). If you set this mode for any other raster operations, the COLORONCOLOR mode will be used for bitmaps with a color depth greater than 1bpp, and the BLACKONWHITE mode will be used for bitmaps with a color depth of 1bpp. |
If the function fails, the return value is zero.
To get extended error information, call GetLastError.
Requirements
| Header | windows.h |
| Library | coredll.lib |
| Windows Embedded CE | Windows CE 5.0 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |