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GetStretchBltMode function (wingdi.h)

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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

See also

Bitmap Functions

Bitmaps Overview

SetStretchBltMode