Re: ImageList_Draw and icons with alpha channel

You were correct. I need to use
CImageList::Add(m_h32bppXORMask,m_h32bppANDMask);

As In:
// add the 32bpp Alpha Icon Bitmap Masks to a new imagelist and draw it to
the dialog
WTL::CImageList iml;
iml.Create(90, 32, ILC_COLOR32 | ILC_MASK, 2, 0); // Explorer icon with
highlighted "Hello" text next to the icon
iml.Add(m_h32bppXORMask,m_h32bppANDMask); // This is the icon that I
created with my previous post
DeleteObject(m_h32bppXORMask);
DeleteObject(m_h32bppANDMask);
iml.SetBkColor(CLR_NONE);
SetBkColor(ps.hdc, GetSysColor(COLOR_3DFACE));
iml.Draw(ps.hdc, 0, 10, 90, ILD_NORMAL);
iml.Destroy();

The image displays correctly with XPSP2 and Windows 2003SP1

"Michael Phillips, Jr." <mphillips53@xxxxxxxxxxxxxxx> wrote in message
news:OlfocEm2FHA.2816@xxxxxxxxxxxxxxxxxxxxxxx
> There are several CImageList Add methods.
>
> The one that I think will work best for you is
> Add(HICON hIcon).
>
> Here is what I did:
>
> 1) Load the icons as you describe in your code
> 2) Create a Memory DC and DIBSECTION bitmap
> for each bitdepth. You will need a Palette for 8bpp or less bitmaps.
> 3) Select the Dib into the device context
> 4) Use DrawIcon to draw the icon to the memory device
> 5) Use DrawText as in your code to draw the text next to the icon.
> 6) After you use SelectObject and DeleteDC, you now have a
> bitmap with the icon and captioned text next to it.
> 7) You now need to create the XOR and AND masks from this DIB
> For the XOR mask use CreateCompatibleBitmap (i.e., create another
> DIBSECTION)
> For the AND mask use CreateBitmap
> Create memory DC's for each and select the bitmaps into the DC's
>
> Use SetDIBColorTable for 8bpp or less bitmaps before creating the masks
> to make sure the destination XOR bitmap has a color table.
>
> Here is my code for the masks:
>
> // Create AND and XOR masks
> for ( DWORD x = 0; x < dwWidth; x++ )
> {
> for ( DWORD y = 0; y < dwHeight; y++ )
> {
> // clrTransparent is a COLORREF for the transparent color
> // You could sample using GetPixel
> if ( ::GetPixel( hSrcImageDC, x ,y ) == clrTransparent ) // Src Bitmap
> from above
> {
> ::SetPixel( hAndMaskDC, x, y, RGB(255, 255, 255) );
> ::SetPixelV( hXorMaskDC, x, y, RGB(0,0,0) );
> }
> else
> {
> ::SetPixel( hAndMaskDC, x, y, RGB(0,0,0) );
> ::SetPixel( hXorMaskDC, x, y, ::GetPixel( hSrcImageDC, x ,y ) );
> }
> }
> }
> ::GdiFlush();
>
> 8) Now that you have the masks you need to create an Icon
> using CreateIconIndirect
> 9) Add the icons to your image list with Add(HICON hIcon).
>
> Converting the DIB format for each bitdepth is easy. I use BitBlt
> to do all of the work.
>
> Because your sample Icon has shadows, I found that using the 8bpp
> icon as the source gave the best results. You may need to fixup
> the icon first to eliminate the artifacts produced by the Mask creation.
>
>
> "Timo Kunze" <TKunze71216@xxxxxx> wrote in message
> news:%230nUofl2FHA.3420@xxxxxxxxxxxxxxxxxxxxxxx
>> You draw the icon to the dialog and then the text next to it. This works
>> for me, too. But I need an imagelist that contains the icon with the
>> text next to it, i. e. I need icon and text within the same bitmap. This
>> imagelist will be used with ImageList_BeginDrag and the other
>> drag'n'drop functions.
>> So I create a XOR mask and an AND mask as you suggested. I've ensured
>> that the rectangle, that contains the text in the XOR mask, is all black
>> in the AND mask, so it won't be transparent in the combined picture.
>>
>> If I create an imagelist with ILC_COLORDDB | ILC_MASK and add the image
>> (i. e. both masks) which contains icon AND text, the drag image indeed
>> contains icon and text, BUT:
>> - Pixels that have an alpha transparency in the source icon are not
>> transparent anymore.
>> - On Windows 2003 the alpha transparency seems to be correct, but the
>> text is wrong. The text's background isn't blue as it should (and as it
>> is on XP), but white. I've absolutely no idea why this happens.
>>
>> If I create an imagelist with ILC_COLOR32 | ILC_MASK and add the image
>> (i. e. both masks) which contains icon AND text, alpha transparency
>> seems to be correct, but the drag image contains the icon only.
>> Could this have something to do with the palette? Or do I have to create
>> the bitmap, that I'm adding, with CreateDIBSection()?
>>
>> Here're 3 screenshots of how the drag image looks if the imagelist was
>> created with ILC_COLORDDB | ILC_MASK:
>> 1) Windows XP SP2 - drag image is correct, except that alpha
>> transparency is lost.
>> www.timosoft-software.de/stuff/WinXP.png
>> 2) Windows 2003 SP1 - alpha transpareny is correct, but the text's
>> background is white instead of blue (the ImageList_BeginDrag function
>> makes the drag image semi-transparent, so the blue titlebar shines
>> through and makes the text background light-blue).
>> www.timosoft-software.de/stuff/Win2k3.png
>> 3) Windows 2003 SP1 - OLE drag'n'drop, which displays my drag image
>> using IDragSourceHelper and IDropTargetHelper, displays the text
>> background correctly, but alpha-transparency is lost (you can't see this
>> on the screenshot).
>> www.timosoft-software.de/stuff/Win2k3OLE.png
>>
>> The box to the right of the listview displays the drag image and its
>> mask as they are added to the imagelist.
>>
>> BTW, I think it's wrong how you're adding the mask to the imagelist. You
>> call ImageList_Add() once for each image (image = XOR mask + AND mask).
>> If you want to specify a custom AND mask, you can do this using the 3rd
>> parameter of ImageList_Add().
>>
>> Timo
>> --
>> www.TimoSoft-Software.de - the home of ExplorerTreeView
>> Stop software patents!
>
>


.

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