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Coloring Pixels on a Window

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I couldn't find a function that lets me color certain pixels to a different color (Hopefully a transparent/alpha color) on a window.

If anyone could shed some insight on a function like this, it'd be appreciated.

Already looked through the help file, couldn't find one.


Edited by Arakard

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Func SetPixel ($handle, $x, $y, $color)
    $dc= DllCall ("user32.dll", "int", "GetDC", "hwnd", $handle)
    $setpixel= DllCall ("gdi32.dll", "long", "SetPixel", "long", $dc[0], "long", $x, "long", $y, "long", $color)
    $realesedc= DllCall ("user32.dll", "int", "ReleaseDC", "hwnd", 0,  "int", $dc[0])

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