I am trying to display a bitmap to the current device context by first
creating a BITMAP structure, then using
CBitmap::CreateBitmapIndirect, then
CDC::CreateCompatibleDC, then
CDC::SelectObject (CBitmap) and finally
CDC::BitBlt

This works fine so far, but I have a problem with initializing my BITMAP
structure. I want to generate an RGB bitmap, and naive as I am I thought
this would work by setting the variable bmBitPixel of the BITMAP structure
to 24 (24 Bits per Pixel), BUT this does not work. I was playing around with
the variables bmBitPixel, bmPlanes and bmWidthBytes a lot, but every time I
only get one (ONE !!!) pixel displayed. The only combination that works is
to set bmPlanes to 1, bmBitPixel to 16 and to assign an array to bmBits
where two bytes represent the color of one pixel. BUT two bytes are not
enough to dsiplay RGB. I can generate blue bitmaps or yellow bitmaps that
way, but it seems to be impossible to create a RED bitmap !!!

Has anyone an idea of how I can display a REAL RGB bitmap (without using
SetPixel or SETPixelV which is much to slow) ???

Thanks in advance
Bernd

Hello Bernd;
I believe the problem is the current palette (default palette) is 16 color(4
bit).
Also special consideration is given to 24bit color as each pixel contains
its palette, so to speak. When you have an image that is 24 bit and trying
to display it in 256 color(8bit) you have to do special rendering.

But there is some point of confusion for me, I thought that there was an
issue of apps no-longer using palettes on the newer video drivers for
Windows 98/2000.

Or maybe it was just AnimatePalette no longer works??

Try creating and selecting a palette. Creating a 256 color palette is not
hard. You could probably find a msdn example.

Hope this helps.
Richard Jones

For your problem, using either DIB or DIB section would easily solve your
problem. If you want GDI to render into the bitmap, use DIB section,
otherwise use DIB. Read my coming book, which has three chapters on
bitmap/advanced bitmap/image processing, one chapter on palette.

Feng Yuan

Windows Graphics Programming: Win32 GDI and DirectDraw
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