XPost: alt.windows7.general, comp.os.ms-windows.programmer.win32   
   From: newyana@invalid.nospam   
      
   On 10/1/2024 3:02 AM, R.Wieser wrote:   
   > Newyana2,   
   >   
   >> but the docs say GetImageInfo returns an ImageInfo structure, which   
   >> includes an hBitmap.   
   >   
   > Indeed it does.  Having the bitmap(s) is where my problems started. :-\   
   >   
   >> With that you can call things like GetDIBits, SetDIBits, etc.   
   >   
   > Yep, I found the first one too (as well as GetBitmapBits).  But I realized   
   > that it takes a *lot* of work to be able to create something generic from it   
   > (for instance, it would need handlers for all 6 BPP modi).   
   >   
   > Also SetDIBits needs a BITMAPINFO structure filled in with stuff I /somehow/   
   > would need to extract/copy from the origional bitmap.   
   >   
   > The easier way (I think) would be to use CopyBitmap, load it into a   
   > memoryDC* and use that to make the alterations on.   
   >   
   > * which I would need to make sure it would have the same configuration   
   > (Image List Creation Flags) as the one the ImageList was created with.  In   
   > short: another problem.   
   >   
   > ... but that than has a "how do I get it back into the origional   
   > bitmap/imagelist ?" problem.   
   >   
   > I was hoping that the MS way would show me a simple, smart way to circumvent   
   > all that clumsy work.   
   >   
   > By the way:   
   > for one test approach I invoked "the dark arts" and retrieved the   
   > memoryDC(s) the ImageList uses internally.  Drawing on them works as   
   > expected, very easy. Though there are a number of gotya's to recon with.  As   
   > well as the use of "the dark arts" ofcourse. :-)   
   >   
      
       That stuff is something I have to figure out anew every time I   
   work with it. I once wrote a program for my girlfriend to easily   
   do auto-cropping and resizing of photos in high quality. The image   
   ops were so complicated that I used a class to load images, convert   
   to DIB, then do operations on that. GDI gets very complicated.   
   Gdiplus is worse.   
      
       Recently I've been working on functionality to change caret width   
   and color in a text window. The way to do it is to use a bitmap. So   
   I needed to be able to generate an endless variety of bitmaps   
   "on the fly". It took awhile to refresh my memory about hbitmaps and   
   DCs and such. But in VB6 there's the Picturebox control. Lightweight   
   and it wraps a lot of GDI ops. It turned out that I could paint the caret   
   in a hidden picturebox, then pass that picture's handle to the caret   
   function because a picture in a picturebox is a StdPicture. Maybe you   
   have something like that with Borland?   
      
        In terms of imaglists, I have no idea. I've never had occasion to   
   use one. I sometimes use Image controls and sometimes use resources,   
   but never an imagelist.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)