Sets or clears the color key (transparency range) for a specified category
#include <GDIPlus.au3>
_GDIPlus_ImageAttributesSetColorKeys ( $hImageAttributes [, $iColorAdjustType = 0 [, $bEnable = False [, $iARGBLow = 0 [, $iARGBHigh = 0]]]] )
| $hImageAttributes | Pointer to an ImageAttribute object |
| $iColorAdjustType | [optional] The category for which the color key is set or cleared: 0 - Color adjustment applies to all categories that do not have adjustment settings of their own 1 - Color adjustment applies to bitmapped images 2 - Color adjustment applies to brush operations in metafiles 3 - Color adjustment applies to pen operations in metafiles 4 - Color adjustment applies to text drawn in metafiles |
| $bEnable | [optional] If True, transparency range for the specified category is applied; otherwise, transparency |
| $iARGBLow | [optional] Alpha, Red, Green and Blue components of a color that specifies the low color-key value |
| $iARGBHigh | [optional] Alpha, Red, Green and Blue components of a color that specifies the high color-key value |
| Success: | True. |
| Failure: | False and sets the @error flag to non-zero, @extended may contain GPSTATUS error code ($GPIP_ERR* see GPIPlusConstants.au3). |
Any color that has each of its three components (red, green, blue) between the corresponding components of the high and low color keys is made transparent.
Search GdipSetImageAttributesColorKeys in MSDN Library.
#include <GDIPlus.au3>
#include <GUIConstantsEx.au3>
#include <ScreenCapture.au3>
#include <WinAPIHObj.au3>
Example()
Func Example()
_GDIPlus_Startup() ;initialize GDI+
Local Const $iWidth = 600, $iHeight = 600
Local $hGUI = GUICreate("GDI+ Example (" & @ScriptName & ")", $iWidth, $iHeight) ;create a test GUI
GUISetState(@SW_SHOW)
Local $hGraphics = _GDIPlus_GraphicsCreateFromHWND($hGUI) ;create a graphics object from a window handle
Local $hIA = _GDIPlus_ImageAttributesCreate() ;create an ImageAttribute object
_GDIPlus_ImageAttributesSetColorKeys($hIA, 0, True, 0x00000000, 0x00F7F7F7) ;make a range of colors transparent
Local $hHBmp = _ScreenCapture_Capture("", 0, 0, $iWidth, $iHeight) ;create a GDI bitmap by capturing an area on desktop
Local $hBitmap = _GDIPlus_BitmapCreateFromHBITMAP($hHBmp) ;convert GDI to GDI+ bitmap
_WinAPI_DeleteObject($hHBmp) ;release GDI bitmap resource because not needed anymore
_GDIPlus_GraphicsDrawImageRectRect($hGraphics, $hBitmap, 0, 0, $iWidth, $iHeight, 0, 0, $iWidth, $iHeight, $hIA) ;draw the bitmap while applying the color adjustment
Do
Until GUIGetMsg() = $GUI_EVENT_CLOSE
;cleanup GDI+ resources
_GDIPlus_ImageAttributesDispose($hIA)
_GDIPlus_GraphicsDispose($hGraphics)
_GDIPlus_BitmapDispose($hBitmap)
_GDIPlus_Shutdown()
GUIDelete($hGUI)
EndFunc ;==>Example