ExtFloodFill function (wingdi.h)

Article
10/13/2021

The ExtFloodFill function fills an area of the display surface with the current brush.

Syntax

BOOL ExtFloodFill(
  [in] HDC      hdc,
  [in] int      x,
  [in] int      y,
  [in] COLORREF color,
  [in] UINT     type
);

Parameters

[in] hdc

A handle to a device context.

[in] x

The x-coordinate, in logical units, of the point where filling is to start.

[in] y

The y-coordinate, in logical units, of the point where filling is to start.

[in] color

The color of the boundary or of the area to be filled. The interpretation of color depends on the value of the fuFillType parameter. To create a COLORREF color value, use the RGB macro.

[in] type

The type of fill operation to be performed. This parameter must be one of the following values.

Value	Meaning
FLOODFILLBORDER	The fill area is bounded by the color specified by the color parameter. This style is identical to the filling performed by the FloodFill function.
FLOODFILLSURFACE	The fill area is defined by the color that is specified by color. Filling continues outward in all directions as long as the color is encountered. This style is useful for filling areas with multicolored boundaries.

Return value

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero.

Remarks

The following are some of the reasons this function might fail:

The filling could not be completed.
The specified point has the boundary color specified by the color parameter (if FLOODFILLBORDER was requested).
The specified point does not have the color specified by color (if FLOODFILLSURFACE was requested).
The point is outside the clipping region, that is, it is not visible on the device.

If the fuFillType parameter is FLOODFILLBORDER, the system assumes that the area to be filled is completely bounded by the color specified by the color parameter. The function begins filling at the point specified by the nXStart and nYStart parameters and continues in all directions until it reaches the boundary.

If fuFillType is FLOODFILLSURFACE, the system assumes that the area to be filled is a single color. The function begins to fill the area at the point specified by nXStart and nYStart and continues in all directions, filling all adjacent regions containing the color specified by color.

Only memory device contexts and devices that support raster-display operations support the ExtFloodFill function. To determine whether a device supports this technology, use the GetDeviceCaps function.

Examples

For an example, see "Adding Lines and Graphs to a Menu" in Using Menus.

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

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