Image reflection (with alpha channel)

jayme65 · January 9, 2015

If would like to reproduce an effect like this one

How would you do to mirror an image with an alpha blend?

Thanks very much for your help/advice!!

Edited January 9, 2015 by jayme65

jayme65 · January 10, 2015

is this that impossible to achieve?

AndyG · January 10, 2015

Hi,

You could use GDI with Function _GDIPlus_ImageRotateFlip()

;original by UEZ ;o)

#include <ScreenCapture.au3>

_GDIPlus_Startup()
Global Const $iDiv = @DesktopHeight
Global Const $hHBitmap = _ScreenCapture_Capture("", 0, 0, @DesktopWidth, $iDiv)
Global Const $hBitmap = _GDIPlus_BitmapCreateFromHBITMAP($hHBitmap)
Global Const $hCtxt = _GDIPlus_ImageGetGraphicsContext($hBitmap)
_WinAPI_DeleteObject($hHBitmap)

Global Const $hBitmap_Temp = _GDIPlus_BitmapCreateFromScan0(@DesktopWidth, $iDiv)
Global Const $hCtxt_Temp = _GDIPlus_ImageGetGraphicsContext($hBitmap_Temp)

Global $iStep = 0


    _GDIPlus_GraphicsDrawImageRectRect($hCtxt_Temp, $hBitmap, $iStep, 0, $iDiv, $iDiv, 0, 0, $iDiv, $iDiv)
    _GDIPlus_ImageRotateFlip($hBitmap_Temp,6)
    _GDIPlus_GraphicsDrawImageRectRect($hCtxt, $hBitmap_Temp, 0, 0, $iDiv, $iDiv, $iStep, 0, $iDiv, $iDiv)


Global Const $hGUI = GUICreate("Flipped Images", @DesktopWidth, $iDiv)
GUISetState()
Global Const $hGraphic = _GDIPlus_GraphicsCreateFromHWND($hGUI)
_GDIPlus_GraphicsDrawImageRect($hGraphic, $hBitmap, 0, 0, @DesktopWidth, $iDiv)

Do
Until GUIGetMsg() = -3

_GDIPlus_BitmapDispose($hBitmap)
_GDIPlus_BitmapDispose($hBitmap_Temp)
_GDIPlus_GraphicsDispose($hCtxt)
_GDIPlus_GraphicsDispose($hCtxt_Temp)
_GDIPlus_GraphicsDispose($hGraphic)
_GDIPlus_Shutdown()
GUIDelete()
Exit

Edited January 10, 2015 by AndyG

jayme65 · January 10, 2015

Andy,

Thanks very much for your help and for the time taken to write this script!!

Any idea on how to apply an alpha blen to a bitmap to achieve the reflection effetct?

UEZ · January 10, 2015

Have a look here:

Br,

UEZ

Yashied · January 11, 2015

With alpha channel.

#Include <GDIPlus.au3>

If StringRegExpReplace(@AutoItVersion, '(?<!\d)(\d)(?!\d)', '0\1') < '03.03.12.00' Then
    MsgBox(16, 'Error', 'Require AutoIt 3.3.12.0 or later.')
EndIf

$sFile = @ScriptDir & '\iPhone.png'

_GDIPlus_Startup()
$hBitmap = _GDIPlus_BitmapCreateFromFile($sFile)
$hReflection = _GDIPlus_BitmapCreateReflectionBitmap($hBitmap, _GDIPlus_ImageGetHeight($hBitmap) * 0.25, 128)
_GDIPlus_ImageSaveToFile($hReflection, StringRegExpReplace($sFile, '(\.[^\.]+)', '_Reflection\1'))
_GDIPlus_BitmapDispose($hReflection)
_GDIPlus_BitmapDispose($hBitmap)
_GDIPlus_Shutdown()

Func _GDIPlus_BitmapCreateReflectionBitmap($hBitmap, $iReflectionHeight, $iAlpha)

    Local $hGraphics, $hBrush, $hReflection[2], $hAlpha, $hResult, $Size

    $Size = DllCall($__g_hGDIPDll, 'uint', 'GdipGetImageDimension', 'handle', $hBitmap, 'float*', 0, 'float*', 0)
    If (@Error) Or ($Size[0]) Then
        Return 0
    EndIf
    If $iReflectionHeight > $Size[3] Then
        $iReflectionHeight = $Size[3]
    EndIf
    If $iReflectionHeight < 0 Then
        $iReflectionHeight = 0
    EndIf
    $hReflection[0] = _GDIPlus_BitmapCloneArea($hBitmap, 0, $Size[3] - $iReflectionHeight, $Size[2], $iReflectionHeight, $GDIP_PXF32ARGB)
    _GDIPlus_ImageRotateFlip($hReflection[0], 6)
    $hAlpha = _GDIPlus_BitmapCreateFromScan0($Size[2], $iReflectionHeight, $GDIP_PXF32ARGB)
    $hGraphics = _GDIPlus_ImageGetGraphicsContext($hAlpha)
    _GDIPlus_GraphicsClear($hGraphics, 0)
    $hBrush = _GDIPlus_LineBrushCreate(0, 0, 0, $iReflectionHeight, BitShift($iAlpha, -24), 0)
    _GDIPlus_GraphicsFillRect($hGraphics, 0, 0, $Size[2], $iReflectionHeight, $hBrush)
    _GDIPlus_GraphicsDispose($hGraphics)
    $hReflection[1] = _GDIPlus_BitmapCreateBitmapWithAlpha($hReflection[0], $hAlpha)
    $hResult = _GDIPlus_BitmapCreateFromScan0($Size[2], $Size[3] + $iReflectionHeight)
    $hGraphics = _GDIPlus_ImageGetGraphicsContext($hResult)
    _GDIPlus_GraphicsClear($hGraphics, 0)
    _GDIPlus_GraphicsDrawImageRect($hGraphics, $hBitmap, 0, 0, $Size[2], $Size[3])
    _GDIPlus_GraphicsDrawImageRect($hGraphics, $hReflection[1], 0, $Size[3], $Size[2], $iReflectionHeight)
    _GDIPlus_GraphicsDispose($hGraphics)
    _GDIPlus_BitmapDispose($hAlpha)
    For $i = 0 To 1
        _GDIPlus_BitmapDispose($hReflection[$i])
    Next
    _GDIPlus_BrushDispose($hBrush)
    Return $hResult
EndFunc   ;==>_GDIPlus_BitmapCreateReflectionBitmap

Func _GDIPlus_BitmapCreateBitmapWithAlpha($hBitmap, $hAlpha, $iChannel = 0)

    Local $hGraphics, $hBmp[2], $bProc, $tProc, $pProc, $Size1, $Size2, $Lenght, $Result
    Local $tData[2] = [$GDIP_ILMWRITE, $GDIP_ILMREAD]

    $Size1 = DllCall($__g_hGDIPDll, 'uint', 'GdipGetImageDimension', 'handle', $hBitmap, 'float*', 0, 'float*', 0)
    If (@Error) Or ($Size1[0]) Then
        Return 0
    EndIf
    $Size2 = DllCall($__g_hGDIPDll, 'uint', 'GdipGetImageDimension', 'handle', $hAlpha, 'float*', 0, 'float*', 0)
    If (@Error) Or ($Size2[0]) Then
        Return 0
    EndIf
    $hBmp[0] = _GDIPlus_BitmapCloneArea($hBitmap, 0, 0, $Size1[2], $Size1[3], $GDIP_PXF32ARGB)
    If ($Size1[2] = $Size2[2]) And ($Size1[3] = $Size2[3]) Then
        $hBmp[1] = $hAlpha
    Else
        $hBmp[1] = _GDIPlus_BitmapCreateFromScan0($Size1[2], $Size1[3], $GDIP_PXF32ARGB)
        $hGraphics = _GDIPlus_ImageGetGraphicsContext($hBmp[1])
        _GDIPlus_GraphicsClear($hGraphics, 0)
        _GDIPlus_GraphicsDrawImageRect($hGraphics, $hAlpha, 0, 0, $Size1[2], $Size1[3])
        _GDIPlus_GraphicsDispose($hGraphics)
    EndIf
    If ($iChannel < 0) Or ($iChannel > 3) Then
        $iChannel = 0
    EndIf
    For $i = 0 To 1
        $tData[$i] = _GDIPlus_BitmapLockBits($hBmp[$i], 0, 0, $Size1[2], $Size1[3], $tData[$i], $GDIP_PXF32ARGB)
    Next
    If @AutoItX64 Then
        $bProc = Binary('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
    Else
        $bProc = Binary('0x555331C0505050837C241800740431C0EB05B80100000021C07568837C241C00740431C0EB05B80100000021C07545837C242000740431C0EB05B80100000021C075228B5C242421DB7C0B8B5C242483FB037F02EB07B801000000EB0231C021C07502EB07B801000000EB0231C021C07502EB07B801000000EB0231C021C07502EB07B801000000EB0231C021C0740431C0EB6B8B5C241883C303891C248B5C241C2B5C242483C303895C2404C7442408000000008B5C24204B3B5C24087C368B2C240FB65D008B6C24040FB645000FAFD889D8B9FF00000099F7F989C3538B6C240458884500830424048344240404FF44240871BFB801000000EB0231C083C40C5B5DC21000')
    EndIf
    $Length = BinaryLen($bProc)
    $pProc = DllCall('kernel32.dll', 'ptr', 'VirtualAlloc', 'ptr', 0, 'ulong_ptr', $Length, 'dword', 0x1000, 'dword', 0x0040)
    $tProc = DllStructCreate('byte[' & $Length & ']', $pProc[0])
    DllStructSetData($tProc, 1, $bProc)
    $Result = DllCallAddress('uint', $pProc[0], 'ptr', $tData[0].Scan0, 'ptr', $tData[1].Scan0, 'uint', $Size1[2] * $Size1[3], 'uint', $iChannel)
    If Not $Result[0] Then
        ; Nothing
    EndIf
    DllCall('kernel32.dll', 'int', 'VirtualFree', 'ptr', $pProc[0], 'ulong_ptr', 0, 'dword', 0x4000)
    For $i = 0 To 1
        _GDIPlus_BitmapUnlockBits($hBmp[$i], $tData[$i])
    Next
    If $hBmp[1] <> $hAlpha Then
        _GDIPlus_BitmapDispose($hBmp[1])
    EndIf
    Return $hBmp[0]
EndFunc   ;==>_GDIPlus_BitmapCreateBitmapWithAlpha

Edited January 13, 2015 by Yashied

UEZ · January 11, 2015

Here one more which I found in my collections:

;idea from here -> http://danbystrom.se/2009/01/12/thumbnails-with-glass-table-reflection-in-gdi/
;coded by UEZ 2013-10-04

#include <GDIPlus.au3>

Opt("GUIOnEventMode", 1)

_GDIPlus_Startup()
Global Const $sFile = FileOpenDialog("Select an image", "", "Images (*.bmp,*.gif;*.jpg;*.png)")
If @error Then Exit


Global Const $hGUI = GUICreate("GDI+ Thumbnails with glass table reflection", 600, 400)
GUISetBkColor(0xF0F0F0)
GUISetState()

Global Const $hGraphic = _GDIPlus_GraphicsCreateFromHWND($hGUI)
Global Const $hImage = _GDIPlus_ImageLoadFromFile($sFile)

$t = TimerInit()
Global Const $hBmp = _GDIPlus_BitmapCreateThumbnailWithReflection($hImage)
ConsoleWrite(TimerDiff($t) & " ms" & @LF)
$t = TimerInit()
Global Const $hBmp2 = _GDIPlus_BitmapCreateThumbnailWithReflection2($hImage)
ConsoleWrite(TimerDiff($t) & " ms" & @LF)
ConsoleWrite(_GDIPlus_ImageGetWidth($hBmp) & " x " & _GDIPlus_ImageGetHeight($hBmp) & @LF)
_GDIPlus_GraphicsDrawImage($hGraphic, $hBmp, (400 - _GDIPlus_ImageGetWidth($hBmp)) / 2, (400 - _GDIPlus_ImageGetHeight($hBmp)) / 2)
_GDIPlus_GraphicsDrawImage($hGraphic, $hBmp2, (600 + _GDIPlus_ImageGetWidth($hBmp2)) / 2, (400 - _GDIPlus_ImageGetHeight($hBmp2)) / 2)
GUISetOnEvent(-3, "_Exit")

While Sleep(2 ^ 16)
WEnd

Func _Exit()
    _GDIPlus_BitmapDispose($hBmp)
    _GDIPlus_BitmapDispose($hBmp2)
    _GDIPlus_ImageDispose($hImage)
    _GDIPlus_GraphicsDispose($hGraphic)
    _GDIPlus_Shutdown()
    Exit
EndFunc   ;==>_Exit

Func _GDIPlus_BitmapCreateThumbnailWithReflection($hImage, $iTNWidth = 150, $iTNHeight = 150, $iSkew = 40, $iBorderWhite = 2, $iBorderBlack = 1, $fBlur = 0.4, $iBrightness = 175, $iContrast = -70, $iSmooth = 7)
    Local $iWidth = _GDIPlus_ImageGetWidth($hImage), $iHeight = _GDIPlus_ImageGetHeight($hImage), $f
    If $iWidth > $iHeight Then
        $iTNHeight *= $iHeight / $iWidth
    ElseIf $iWidth < $iHeight Then
        $iTNWidth *= $iWidth / $iHeight
    EndIf
    Local $iW = Floor($iTNWidth + ($iBorderWhite + $iBorderBlack) * 2), $iH = Floor($iTNHeight + ($iBorderWhite + $iBorderBlack) * 2)
    Local $hBitmap = _GDIPlus_BitmapCreateFromScan0($iW, $iH * 2 - $iBorderBlack)
    Local $hCtxt = _GDIPlus_ImageGetGraphicsContext($hBitmap)
    _GDIPlus_GraphicsSetInterpolationMode($hCtxt, $iSmooth)
;~  _GDIPlus_GraphicsClear($hCtxt, 0xFFFFFFFF)
    Local $hBitmap_tmp = _GDIPlus_BitmapCreateFromScan0($iW, $iH)
    Local $hCtxt_tmp = _GDIPlus_ImageGetGraphicsContext($hBitmap_tmp)
    _GDIPlus_GraphicsSetInterpolationMode($hCtxt_tmp, $iSmooth)
    Local $hPen = _GDIPlus_PenCreate(0xFFFFFFFF, $iBorderWhite)
    _GDIPlus_GraphicsDrawRect($hCtxt_tmp, $iBorderBlack, $iBorderBlack, $iW - $iBorderWhite - $iBorderBlack, $iH - $iBorderWhite - $iBorderBlack, $hPen)
    _GDIPlus_PenSetColor($hPen, 0xFF000000)
    _GDIPlus_PenSetWidth($hPen, $iBorderBlack)
    _GDIPlus_GraphicsDrawRect($hCtxt_tmp, 0, 0, $iW - $iBorderBlack / 2, $iH, $hPen)
    _GDIPlus_GraphicsDrawImageRect($hCtxt_tmp, $hImage, $iBorderWhite + $iBorderBlack, $iBorderWhite + $iBorderBlack, $iTNWidth, $iTNHeight)
    _GDIPlus_GraphicsDrawImage($hCtxt, $hBitmap_tmp, 0, 0)
    _GDIPlus_ImageRotateFlip($hBitmap_tmp, 6)

    Local Const $iQual = 6
    Local $hBmpSmall = _GDIPlus_BitmapCreateFromScan0($iW, $iH)
    Local $hGfxSmall = _GDIPlus_ImageGetGraphicsContext($hBmpSmall)
    _GDIPlus_GraphicsSetPixelOffsetMode($hGfxSmall, 2)
    Local $hBmpBig = _GDIPlus_BitmapCreateFromScan0($iW, $iH)
    Local $hGfxBig = _GDIPlus_ImageGetGraphicsContext($hBmpBig)
    _GDIPlus_GraphicsSetPixelOffsetMode($hGfxBig, 2)

    _GDIPlus_GraphicsScaleTransform($hGfxSmall, $fBlur, $fBlur)
    _GDIPlus_GraphicsSetInterpolationMode($hGfxSmall, $iQual)

    _GDIPlus_GraphicsScaleTransform($hGfxBig, 1 / $fBlur, 1 / $fBlur)
    _GDIPlus_GraphicsSetInterpolationMode($hGfxBig, $iQual)

    _GDIPlus_GraphicsDrawImageRect($hGfxSmall, $hBitmap_tmp, 0, 0, $iW, $iH)
    _GDIPlus_GraphicsDrawImageRect($hGfxBig, $hBmpSmall, 0, 0, $iW, $iH)

    _GDIPlus_GraphicsDrawImageRect($hCtxt_tmp, $hBmpBig, 0, 0, $iW, $iH)

    _GDIPlus_GraphicsDispose($hGfxSmall)
    _GDIPlus_GraphicsDispose($hGfxBig)
    _GDIPlus_BitmapDispose($hBmpSmall)
    _GDIPlus_BitmapDispose($hBmpBig)

    Local $fAlpha, $iColor, $iPixelColor
    Local $tBitmapData = _GDIPlus_BitmapLockBits($hBitmap_tmp, 0, 0, $iW, $iH, BitOR($GDIP_ILMWRITE, $GDIP_ILMREAD), $GDIP_PXF32ARGB)
    Local $iScan0 = DllStructGetData($tBitmapData, "Scan0") ;get scan0 (pixel data) from locked bitmap
    Local $tPixel = DllStructCreate("int[" & $iW * $iH & "];", $iScan0)
    Local $iPixel, $iRowOffset, $iR, $iG, $iB
    For $iY = 0 To $iH - 1
        $iRowOffset = $iY * $iW + 1
        $fAlpha = (0xF8 * ($iH - $iY - 0x18) / $iH)
        If $fAlpha < 0 Then $fAlpha = 0
        For $iX = 0 To $iW - 1
            $iPixelColor = BitAND(DllStructGetData($tPixel, 1, $iRowOffset + $iX), 0x00FFFFFF)
            $iR = BitAND(BitShift($iPixelColor, 16), 0x0000FF)
            $iG = BitAND(BitShift($iPixelColor, 8), 0x0000FF)
            $iB = BitAND($iPixelColor, 0x0000FF)
            DllStructSetData($tPixel, 1, "0x" & _
                    Hex(Int($fAlpha), 2) & _
                    Hex(Int(($iR * 3 + $iG * 2 + $iB * 2) / 8), 2) & _
                    Hex(Int(($iR * 2 + $iG * 3 + $iB * 2) / 8), 2) & _
                    Hex(Int(($iR * 2 + $iG * 2 + $iB * 3) / 8), 2), $iRowOffset + $iX)
        Next
    Next
    _GDIPlus_BitmapUnlockBits($hBitmap_tmp, $tBitmapData)
    _GDIPlus_PenDispose($hPen)
    _GDIPlus_GraphicsDrawImageRect($hCtxt, $hBitmap_tmp, 0, $iH, $iW, $iH)
    _GDIPlus_GraphicsDispose($hCtxt)
    _GDIPlus_GraphicsDispose($hCtxt_tmp)
    _GDIPlus_BitmapDispose($hBitmap_tmp)
    If $iSkew Then
        $iW = _GDIPlus_ImageGetWidth($hBitmap)
        $iH = _GDIPlus_ImageGetHeight($hBitmap)
        Local $hBitmapSkewed = _GDIPlus_BitmapCreateFromScan0($iW, $iH), $x
        $hCtxt = _GDIPlus_ImageGetGraphicsContext($hBitmapSkewed)
;~      _GDIPlus_DrawImagePoints($hCtxt, $hBitmap, 0, 0, $iW, $iSkew, 0, $iH)
        For $x = 0 To $iW - 1
            _GDIPlus_GraphicsDrawImageRectRect($hCtxt, $hBitmap, _
                    $x, 0, 1, $iH, _
                    $x, 0, 1, $iH - $iSkew * ($iW - $x) / $iW)
        Next
        _GDIPlus_GraphicsDispose($hCtxt)
        _GDIPlus_BitmapDispose($hBitmap)
        Return $hBitmapSkewed
    EndIf
    Return $hBitmap
EndFunc   ;==>_GDIPlus_BitmapCreateThumbnailWithReflection

Func _GDIPlus_BitmapCreateThumbnailWithReflection2($hImage, $iTNWidth = 150, $iTNHeight = 150, $iSkew = 40, $iBorderWhite = 2, $iBorderBlack = 1, $fBlur = 3.25, $iBrightness = 170, $iContrast = -70, $iSmooth = 7)
    Local $iWidth = _GDIPlus_ImageGetWidth($hImage), $iHeight = _GDIPlus_ImageGetHeight($hImage), $f
    If $iWidth > $iHeight Then
        $iTNHeight *= $iHeight / $iWidth
    ElseIf $iWidth < $iHeight Then
        $iTNWidth *= $iWidth / $iHeight
    EndIf
    Local $iW = Floor($iTNWidth + ($iBorderWhite + $iBorderBlack) * 2), $iH = Floor($iTNHeight + ($iBorderWhite + $iBorderBlack) * 2)
    Local $hBitmap = _GDIPlus_BitmapCreateFromScan0($iW, $iH * 2 - $iBorderBlack)
    Local $hCtxt = _GDIPlus_ImageGetGraphicsContext($hBitmap)
    _GDIPlus_GraphicsSetInterpolationMode($hCtxt, $iSmooth)
    Local $hBitmap_tmp = _GDIPlus_BitmapCreateFromScan0($iW, $iH)
    Local $hCtxt_tmp = _GDIPlus_ImageGetGraphicsContext($hBitmap_tmp)
    _GDIPlus_GraphicsSetInterpolationMode($hCtxt_tmp, $iSmooth)
    Local $hPen = _GDIPlus_PenCreate(0xFFFFFFFF, $iBorderWhite)
    _GDIPlus_GraphicsDrawRect($hCtxt_tmp, $iBorderBlack, $iBorderBlack, $iW - $iBorderWhite - $iBorderBlack, $iH - $iBorderWhite - $iBorderBlack, $hPen)
    _GDIPlus_PenSetColor($hPen, 0xFF000000)
    _GDIPlus_PenSetWidth($hPen, $iBorderBlack)
    _GDIPlus_GraphicsDrawRect($hCtxt_tmp, 0, 0, $iW - $iBorderBlack / 2, $iH, $hPen)
    _GDIPlus_GraphicsDrawImageRect($hCtxt_tmp, $hImage, $iBorderWhite + $iBorderBlack, $iBorderWhite + $iBorderBlack, $iTNWidth, $iTNHeight)
    _GDIPlus_GraphicsDrawImage($hCtxt, $hBitmap_tmp, 0, 0)
    _GDIPlus_ImageRotateFlip($hBitmap_tmp, 6)

    Local $hEffectBC = _GDIPlus_EffectCreateBrightnessContrast($iBrightness, $iContrast)
    _GDIPlus_BitmapApplyEffect($hBitmap_tmp, $hEffectBC)
    Local $hEffectBlur = _GDIPlus_EffectCreateBlur($fBlur, True)
    _GDIPlus_BitmapApplyEffect($hBitmap_tmp, $hEffectBlur)

    _GDIPlus_EffectDispose($hEffectBC)
    _GDIPlus_EffectDispose($hEffectBlur)

    Local $hAttribute_Alpha = _GDIPlus_ImageAttributesCreate()
    Local $hBitmap_Alpha = _GDIPlus_BitmapCreateFromScan0($iW, $iH)
    Local $hCtxt_Alpha = _GDIPlus_ImageGetGraphicsContext($hBitmap_Alpha), $iY, $tColorMatrix, $d = (-1 / 0x80)

    For $iY = 0 To $iH - 1
        $tColorMatrix = _GDIPlus_ColorMatrixCreateTranslate(0, 0, 0, $iY * $d)
        _GDIPlus_ImageAttributesSetColorMatrix($hAttribute_Alpha, 0, True, DllStructGetPtr($tColorMatrix))
        _GDIPlus_GraphicsDrawImageRectRect($hCtxt_Alpha, $hBitmap_tmp, 0, $iY, $iW, 1, 0, $iY, $iW, 1, $hAttribute_Alpha)
    Next

    _GDIPlus_GraphicsDispose($hCtxt_Alpha)
    _GDIPlus_ImageAttributesDispose($hAttribute_Alpha)
    _GDIPlus_PenDispose($hPen)
    _GDIPlus_GraphicsDrawImageRect($hCtxt, $hBitmap_Alpha, 0, $iH, $iW, $iH)
    _GDIPlus_GraphicsDispose($hCtxt)
    _GDIPlus_GraphicsDispose($hCtxt_tmp)
    _GDIPlus_BitmapDispose($hCtxt_Alpha)
    _GDIPlus_BitmapDispose($hBitmap_tmp)
    If $iSkew Then
        $iW = _GDIPlus_ImageGetWidth($hBitmap)
        $iH = _GDIPlus_ImageGetHeight($hBitmap)
        Local $hBitmapSkewed = _GDIPlus_BitmapCreateFromScan0($iW, $iH), $iX
        $hCtxt = _GDIPlus_ImageGetGraphicsContext($hBitmapSkewed)
;~      _GDIPlus_DrawImagePoints($hCtxt, $hBitmap, 0, 0, $iW, $iSkew, 0, $iH)
        For $iX = 0 To $iW - 1
            _GDIPlus_GraphicsDrawImageRectRect($hCtxt, $hBitmap, _
                                                        $iX, 0, 1, $iH, _
                                                        $iX, 0, 1, $iH - $iSkew * ($iW - $iX) / $iW)
        Next
        _GDIPlus_GraphicsDispose($hCtxt)
        _GDIPlus_BitmapDispose($hBitmap)
        Return $hBitmapSkewed
    EndIf
    Return $hBitmap
EndFunc   ;==>_GDIPlus_BitmapCreateThumbnailWithReflection2

Br,

UEZ

Yashied · January 11, 2015

@UEZ

If you do it pixel by pixel (line by line) using AutoIt, it will take a lot of time. ASM will reduce the time by several orders.

UEZ · January 11, 2015

You are right. For a few images it should be fast enough but for plenty of images it's too slow.

Learning ASM / C++ is the next level of coding for me. But when...

Br,

UEZ

jayme65 · January 11, 2015

Thanks very much for the url (UEZ) and for the complete code (Yashied) to achieve this reflection effect!

I'm really gratefull to you!!

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Image reflection (with alpha channel)

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