| WORD ScanLR(lpDestDev, X, Y, dwPhysColor, Style) | |||
| LPPDEVICE lpDestDev; | |||
| WORD X; | |||
| WORD Y; | |||
| PCOLOR dwPhysColor; | |||
| WORD Style; |
The ScanLR function scans the display surface horizontally from the given pixel, looking for the first pixel having the given color or a pixel that has any other color. The scan can be left or right. GDI calls this function when an application calls the FloodFill or ExtFloodFill function (GDI.25 or GDI.372).
A graphics driver must export the ScanLR function if it sets the DT_RASDISPLAY value in the dpTechnology member of the GDIINFO structure.
lpDestDev
Points to a PDEVICE or PBITMAP structure specifying the destination device or bitmap.
X
Specifies the x-coordinate of the starting pixel.
Y
Specifies the y-coordinate of the starting pixel.
dwPhysColor
Specifies a physical color value.
Style
Specifies the action to take. The parameter can be a combination of the following values.
| Value | Meaning |
| 0x0001 | Scans for a pixel with color matching the dwPhysColor parameter. If this value is not given, the function scans for a pixel with color that does not match. |
| 0x0002 | Scans to the left. If this value is not specified, the function scans to the right. |
The return value is the x-coordinate of the first qualifying pixel. Otherwise, it is -1 if no qualifying pixel is found. The return value is 0x8000 if the X or Y parameters specify coordinates that exceed the display surface or bitmap boundaries.
The export ordinal for this function is 12.