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YellowLab

GDIPlus Rotate Image - Assign to Control

5 posts in this topic

#1 ·  Posted (edited)

I have been pulling my hair out with this one. I don't know if it can be done.

Here is what I want to do:

1) Load Image (ideally from a resource, currently from a file)

2) Rotate that image 90 or 180 degrees

3) apply image to an already existing control

This topic has been helpful in getting started:

http://www.autoitscript.com/forum/index.php?showtopic=107822&st=0&p=760283&hl=gdi%20rotate&fromsearch=1&#entry760283

I kind of pilfered that code and have this:

$sFile is the file location

$nW is the rotated image's width (already known)

$nH is the rotate image's height (already known)

_GDIPlus_Startup()
$hImage1 = _GDIPlus_ImageLoadFromFile($sFile)
$hGraphic1 = _GDIPlus_ImageGetGraphicsContext($hImage1)
$hImage2 = _GDIPlus_BitmapCreateFromGraphics($nW,$nH,$hGraphic1)
$hGraphic2 = _GDIPlus_ImageGetGraphicsContext($hImage2)

$matrix = _GDIPlus_MatrixCreate()
_GDIPlus_MatrixRotate($matrix, 90)
_GDIPlus_GraphicsSetTransform($hGraphic2, $matrix)
_GDIPlus_GraphicsDrawImage($hGraphic2, $hImage1, 0, -$nW)

_GDIPlus_ImageSaveToFile($hImage2, @ScriptDir & "\PNGs\image.png")

_GDIPlus_MatrixDispose($matrix)
_GDIPlus_GraphicsDispose($hGraphic1)
_GDIPlus_GraphicsDispose($hGraphic2)
_GDIPlus_ImageDispose($hImage1)
_GDIPlus_ImageDispose($hImage2)

_GDIPlus_Shutdown()

This all works, in that the image dump shows the image rotated 90 degrees. I have tried using Zedna's resource.au3 function _SetBitmapToCtrl; however, the function needs a bitmap, obviously. I have tried to convert the image with out success. Looking at Zedna's function I think this is something of what I need to do, but can't figure out how to complete it on a non-resource entity:

; thanks ProgAndy
; for other types than BITMAP use GDI+ for converting to bitmap first
$hData = _MemGlobalAlloc($nSize,2) 
$pData = _MemGlobalLock($hData)
_MemMoveMemory($ResData,$pData,$nSize)
_MemGlobalUnlock($hData)
$pStream = DllCall( "ole32.dll","int","CreateStreamOnHGlobal", "int",$hData, "long",1, "Int*",0)
$pStream = $pStream[3]
$pBitmap = DllCall($ghGDIPDll,"int","GdipCreateBitmapFromStream", "ptr",$pStream, "int*",0)
$pBitmap = $pBitmap[2]
$hBitmap = _GDIPlus_BitmapCreateHBITMAPFromBitmap($pBitmap)
_SetBitmapToCtrl($CtrlId, $hBitmap)
If @error Then SetError(3, 0, 0)
_GDIPlus_BitmapDispose($pBitmap)
_WinAPI_DeleteObject($pStream)
_MemGlobalFree($hData)

I need '$nSize' for my non-resource data. Further digging in Zedna's code shows this is calculated by (I think):

$ResSize = DllCall("kernel32.dll", "dword", "SizeofResource", "int", $hInstance, "int", $InfoBlock)

where

$hInstance = _WinAPI_GetModuleHandle("")

$InfoBlock = DllCall("kernel32.dll", "int", "FindResourceExA", "int", $hInstance, "long", $ResType, "str", $ResName, "short", $ResLang)

Any help would be appreciated.

Thanks!

Edited by YellowLab

You can't see a rainbow without first experiencing the rain.

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#2 ·  Posted (edited)

Maybe this might help you a little bit: Image Rotation over a background or GDI+ Image Rotator and Saver

Regards,

UEZ

Edited by UEZ

Please don't send me any personal message and ask for support! I will not reply!

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I think I have gotten it solved. I was deleting the converted resource:

This code will crash:

_GDIPlus_Startup()
$hImage1 = _GDIPlus_ImageLoadFromFile($sFile)
$hGraphic1 = _GDIPlus_ImageGetGraphicsContext($hImage1)
$hImage2 = _GDIPlus_BitmapCreateFromGraphics($nW,$nH,$hGraphic1)
$hGraphic2 = _GDIPlus_ImageGetGraphicsContext($hImage2)

$matrix = _GDIPlus_MatrixCreate()
_GDIPlus_MatrixRotate($matrix, 90)
_GDIPlus_GraphicsSetTransform($hGraphic2, $matrix)
_GDIPlus_GraphicsDrawImage($hGraphic2, $hImage1, 0, -$nW)

$hBitmap = _GDIPlus_BitmapCreateHBITMAPFromBitmap($hImage2)

_SetBitmapToCtrl($arControls[$nIndex][$MY_CONTROL_ID], $hBitmap)

_GDIPlus_MatrixDispose($matrix)
_GDIPlus_GraphicsDispose($hGraphic1)
_GDIPlus_GraphicsDispose($hGraphic2)
_GDIPlus_ImageDispose($hImage1)
_GDIPlus_ImageDispose($hImage2)
_GDIPlus_BitmapDispose($hBitmap)

_GDIPlus_Shutdown()

This code will not and works as intended:

_GDIPlus_Startup()
$hImage1 = _GDIPlus_ImageLoadFromFile($sFile)
$hGraphic1 = _GDIPlus_ImageGetGraphicsContext($hImage1)
$hImage2 = _GDIPlus_BitmapCreateFromGraphics($nW,$nH,$hGraphic1)
$hGraphic2 = _GDIPlus_ImageGetGraphicsContext($hImage2)

$matrix = _GDIPlus_MatrixCreate()
_GDIPlus_MatrixRotate($matrix, 90)
_GDIPlus_GraphicsSetTransform($hGraphic2, $matrix)
_GDIPlus_GraphicsDrawImage($hGraphic2, $hImage1, 0, -$nW)

$hBitmap = _GDIPlus_BitmapCreateHBITMAPFromBitmap($hImage2)

_SetBitmapToCtrl($arControls[$nIndex][$MY_CONTROL_ID], $hBitmap)

_GDIPlus_MatrixDispose($matrix)
_GDIPlus_GraphicsDispose($hGraphic1)
_GDIPlus_GraphicsDispose($hGraphic2)
_GDIPlus_ImageDispose($hImage1)
_GDIPlus_ImageDispose($hImage2)
;_GDIPlus_BitmapDispose($hBitmap) ;DO NOT DISPOSE!

It was found by removing the $hBitmap resource entirely:

_GDIPlus_Startup()
$hImage1 = _GDIPlus_ImageLoadFromFile($sFile)
$hGraphic1 = _GDIPlus_ImageGetGraphicsContext($hImage1)
$hImage2 = _GDIPlus_BitmapCreateFromGraphics($nW,$nH,$hGraphic1)
$hGraphic2 = _GDIPlus_ImageGetGraphicsContext($hImage2)

$matrix = _GDIPlus_MatrixCreate()
_GDIPlus_MatrixRotate($matrix, 90)
_GDIPlus_GraphicsSetTransform($hGraphic2, $matrix)
_GDIPlus_GraphicsDrawImage($hGraphic2, $hImage1, 0, -$nW)

_SetBitmapToCtrl($arControls[$nIndex][$MY_CONTROL_ID], _GDIPlus_BitmapCreateHBITMAPFromBitmap($hImage2))

_GDIPlus_MatrixDispose($matrix)
_GDIPlus_GraphicsDispose($hGraphic1)
_GDIPlus_GraphicsDispose($hGraphic2)
_GDIPlus_ImageDispose($hImage1)
_GDIPlus_ImageDispose($hImage2)

Hope someone finds this useful.


You can't see a rainbow without first experiencing the rain.

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Tell me about this function?

_setBitmaptoCtrl

Not disposing of the bitmap seems like a memory leak. Someone recently taught me to set a bitmap to a ctrl as per below. This will delete the bitmap also.

_WinAPI_DeleteObject(GUICtrlSendMsg($Control, 0x0172, 0, $hBMP1))

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SetBitmapToCtrl is a function in Zedna's resource UDF. I agree that not disposing of the bitmap resource is a potential source for a memory leak. Which makes me wonder, why does explicitly defining the bitmap used in the function versus generting it at run time create such different results?

picea892 - the function you provide works perfectly well. Thank you.


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