[GDI+] How to do a proper error return for GraphicsSetCompositingMode? [Solved]

[PAEz]

I needed this routine for some stuff Im doing and couldnt find an example on the forums so just wrote a function using what Ive seen others do and it works great but Im not sure on how to do the error return value. Like I said it works, but if Im going to have it in my library Id like it to be right

Func _GDIPlus_GraphicsSetCompositingMode($hGraphic,$mode)
Local $aResult = DllCall($ghGDIPDll, "uint", "GdipSetCompositingMode","handle" ,$hGraphic,"int",$mode)
If @error Then Return SetError(@error, @extended, 0)
Return $aResult[0] = 0
EndFunc   ;==>_GDIPlus_GraphicsSetCompositingMode

This function sets the blend mode for graphics image draw commands.

If mode is 0 then the image will be blended according to its alpha.

If mode is 1 then the image will replace what its being drawn on without blending.

Edited September 2, 2011 by PAEz

[monoscout999]

It seems fine to me. If you need more GDI functions check the Link in my signature "GDIP.au3"

[UEZ]

Can you give an example what this function is doing exactly?

Br,

UEZ

[monoscout999]

Maybe you can change the return to True or in case of error False

@UEZ I don´t have to much idea but it seems that one mode blends the draw with the background and the other don´t

#include <GDIPlus.au3>

_CreateClearPNG(@DesktopDir & "\MyPNG1.png", false)
_CreateClearPNG(@DesktopDir & "\MyPNG2.png", true)

Func _CreateClearPNG($sFile, $iComposite)
    _GDIPlus_Startup()
    Local $hImage = _GDIPlus_BitmapCreateFromScan0(400, 400)
    Local $hGraphics = _GDIPlus_ImageGetGraphicsContext($hImage)
    Local $hBrush = _GDIPlus_BrushCreateSolid(0xAA0000FF)
    If $iComposite then _GDIPlus_GraphicsSetCompositingMode($hGraphics, 1)
    _GDIPlus_GraphicsClear($hGraphics, 0xffff0000)
    _gdiplus_graphicsfillellipse($hGraphics,0,0,400,400,$hBrush)
    _GDIPlus_ImageSaveToFile($hImage, $sFile)
    _GDIPlus_BrushDispose($hBrush)
    _GDIPlus_GraphicsDispose($hGraphics)
    _GDIPlus_BitmapDispose($hImage)
    _GDIPlus_Shutdown()
EndFunc   ;==>_CreateClearPNG
Func _GDIPlus_BitmapCreateFromScan0($iWidth, $iHeight, $iStride = 0, $iPixelFormat = 0x0026200A, $pScan0 = 0)
    Local $aResult = DllCall($ghGDIPDll, "uint", "GdipCreateBitmapFromScan0", "int", $iWidth, "int", $iHeight, "int", $iStride, "int", $iPixelFormat, "ptr", $pScan0, "int*", 0)
    If @error Then Return SetError(@error, @extended, 0)
    Return $aResult[6]
EndFunc   ;==>_GDIPlus_BitmapCreateFromScan0
Func _GDIPlus_GraphicsSetCompositingMode($hGraphic, $mode)
    Local $aResult = DllCall($ghGDIPDll, "uint", "GdipSetCompositingMode", "handle", $hGraphic, "int", $mode)
    If @error Then Return SetError(@error, @extended, 0)
    Return $aResult[0] = true
EndFunc   ;==>_GDIPlus_GraphicsSetCompositingMode

[PAEz]

Thanks monoscout999 Ill check out your file.

And yeah thats what it does monoscout999.

Heres my example (you beat me )....

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#include <GDIPlus.au3>
_GDIPlus_Startup()
Local $imagespath="C:\Program Files\AutoIt3\Examples\GUI\merlin.gif"
 
Func GdipCreateTexture($hImg, $WrapMode = 0x00)
Local $DLL = "gdiplus.dll"
Local $RESULT
$RESULT = DllCall($DLL, "int", "GdipCreateTexture", "int", $hImg, "int", $WrapMode, "int*", 0)
Return $RESULT[3]
EndFunc   ;==>GdipCreateTexture
 
Func _GDIPlus_BitmapCreateFromScan0($iWidth, $iHeight, $iStride = 0, $iPixelFormat = 0x0026200A, $pScan0 = 0)
Local $aResult = DllCall($ghGDIPDll, "uint", "GdipCreateBitmapFromScan0", "int", $iWidth, "int", $iHeight, "int", $iStride, "int", $iPixelFormat, "ptr", $pScan0, "int*", 0)
If @error Then Return SetError(@error, @extended, 0)
Return $aResult[6]
EndFunc   ;==>_GDIPlus_BitmapCreateFromScan0
 
Func _GDIPlus_GraphicsSetCompositingMode($hGraphic,$mode)
Local $aResult = DllCall($ghGDIPDll, "uint", "GdipSetCompositingMode","handle" ,$hGraphic,"int",$mode)
If @error Then Return SetError(@error, @extended, 0)
Return $aResult[0] = 0
EndFunc   ;==>_GDIPlus_GraphicsSetCompositingMode
 
Local $TextureImage = _GDIPlus_ImageLoadFromFile( $imagespath)
Local $brush = GdipCreateTexture($TextureImage)
Local $image = _GDIPlus_BitmapCreateFromScan0(500, 500)
Local $graphic = _GDIPlus_ImageGetGraphicsContext($image)
 
; Blend mode 0 will blend the pic with the graphic
_GDIPlus_GraphicsClear($graphic, 0x99FFFFFF)
_GDIPlus_GraphicsSetCompositingMode($graphic,0)
_GDIPlus_GraphicsFillRect($graphic, 0, 0, 500, 500, $brush)
_GDIPlus_ImageSaveToFile ($image, @ScriptDir & "\CombineMode0.png")
 
; whilst blend mode 1 will totallly replace the graphic with the image
_GDIPlus_GraphicsSetCompositingMode($graphic,1)
_GDIPlus_GraphicsClear($graphic, 0x99FFFFFF)
_GDIPlus_GraphicsFillRect($graphic, 0, 0, 500, 500, $brush)
_GDIPlus_ImageSaveToFile ($image, @ScriptDir & "\CombineMode1.png")
 
_GDIPlus_BitmapDispose($TextureImage)
_GDIPlus_BitmapDispose($brush)
_GDIPlus_BitmapDispose($image)
_GDIPlus_GraphicsDispose($graphic)
_GDIPlus_Shutdown()

Edited September 2, 2011 by PAEz

[monoscout999]

I edit the example to Splash the images in the screen.

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#include <GDIPlus.au3>

_CreatePNG(@DesktopDir & "\MyPNG1.png", false)
_CreatePNG(@DesktopDir & "\MyPNG2.png", true)
_SPLASHPNG(@DesktopDir & "\MyPNG1.png", 350, 50)
_SPLASHPNG(@DesktopDir & "\MyPNG2.png", @desktopwidth - 750, 50)

Func _CreatePNG($sFile, $iComposite)
    _GDIPlus_Startup()
    Local $hImage = _GDIPlus_BitmapCreateFromScan0(400, 400)
    Local $hGraphics = _GDIPlus_ImageGetGraphicsContext($hImage)
    Local $hBrush = _GDIPlus_BrushCreateSolid(0xAA0000FF)
    If $iComposite then _GDIPlus_GraphicsSetCompositingMode($hGraphics, 1) ; 1 = Not Blend
    _GDIPlus_GraphicsClear($hGraphics, 0xAAff0000)
    _gdiplus_graphicsfillellipse($hGraphics,0,0,400,400,$hBrush)
    _GDIPlus_BrushSetSolidColor($hBrush,0xAA00FFFF)
    _GDIPlus_GraphicsFillRect($hGraphics,0,0,200,200,$hBrush)
    _GDIPlus_ImageSaveToFile($hImage, $sFile)
    _GDIPlus_BrushDispose($hBrush)
    _GDIPlus_GraphicsDispose($hGraphics)
    _GDIPlus_BitmapDispose($hImage)
    _GDIPlus_Shutdown()
EndFunc   ;==>_CreateClearPNG
Func _GDIPlus_BitmapCreateFromScan0($iWidth, $iHeight, $iStride = 0, $iPixelFormat = 0x0026200A, $pScan0 = 0)
    Local $aResult = DllCall($ghGDIPDll, "uint", "GdipCreateBitmapFromScan0", "int", $iWidth, "int", $iHeight, "int", $iStride, "int", $iPixelFormat, "ptr", $pScan0, "int*", 0)
    If @error Then Return SetError(@error, @extended, 0)
    Return $aResult[6]
EndFunc   ;==>_GDIPlus_BitmapCreateFromScan0
Func _GDIPlus_GraphicsSetCompositingMode($hGraphic, $mode)
    Local $aResult = DllCall($ghGDIPDll, "uint", "GdipSetCompositingMode", "handle", $hGraphic, "int", $mode)
    If @error Then Return SetError(@error, @extended, 0)
    Return $aResult[0] = true
EndFunc   ;==>_GDIPlus_GraphicsSetCompositingMode
Func _SPLASHPNG($sPNGFile, $iX, $iY, $iWidth = -1, $iHeight = -1)
    _GDIPlus_Startup()
    Local $hImage = _GDIPlus_ImageLoadFromFile($sPNGFile)
    If $iWidth = -1 Then $iWidth = _GDIPlus_ImageGetWidth($hImage)
    If $iHeight = -1 Then $iHeight = _GDIPlus_ImageGetHeight($hImage)
    Local $hDC = _WinAPI_GetDC(0)
    Local $hGraphics = _GDIPlus_GraphicsCreateFromHDC($hDC)
    _GDIPlus_GraphicsDrawImageRect($hGraphics, $hImage, $iX, $iY, $iWidth, $iHeight)
    _GDIPlus_GraphicsDispose($hGraphics)
    _GDIPlus_ImageDispose($hImage)
    _WinAPI_ReleaseDC(0, $hDC)
    _GDIPlus_Shutdown()
EndFunc   ;==>_SPLASHPNG

[PAEz]

Now your just showing off

and thanks for your help.

[UEZ]

Thanks for the examples!

_GDIPlus_GraphicsSetCompositingMode() is something like turn on/off alpha channel e.g. from images.

Br,

UEZ