I am able to compile and pack bitmaps as resources into my executables with rcc and dmc and then load them with LoadBitmap and display them with standard GDI BitBlt. I am working with large photographs and of course the equivalent JPEGs are as much as 10 times more compact. So I would like to learn how to do the same things with an image format such as JPEG. Can anyone help me out here?

1) How do I declare a JPEG image as a resource that Digital Mars
rcc (not MS rc) will compile?

2) How do I find and load the JPEG resource?

3) How do I translate the JPEG image data into a format that GDI
will render (such as a DIB into an offscreen DC)?

If this is complex and someone can provide a complete (C/C++) example, I'm even willing to pay you a few bucks via money order as a consulting fee.

Thanks,
Erik

Den 16-11-2011 14:10, Erik Weber skrev:
> I am able to compile and pack bitmaps as resources into my
> executables with rcc and dmc and then load them with LoadBitmap
> and display them with standard GDI BitBlt. I am working with large
> photographs and of course the equivalent JPEGs are as much as 10
> times more compact. So I would like to learn how to do the same
> things with an image format such as JPEG. Can anyone help me out
> here?
>
> 1) How do I declare a JPEG image as a resource that Digital Mars
> rcc (not MS rc) will compile?
>
> 2) How do I find and load the JPEG resource?
>
> 3) How do I translate the JPEG image data into a format that GDI
> will render (such as a DIB into an offscreen DC)?

You could check out jdraw here:
http://damb.dk/graphics.php

It can do the above, and a few things more

Regards
Bertel

I have not tried to do this just using Windows Functions. I have downloaded some freeware that converts the jpeg to a bitmap as my image requirements are complex, but if you just want to display a jpeg, you will need to do something like this:

Define the image to in the RC file as 'RCDATA'

image    RCDATA  "image.jpg"

You can then access the image using:

  HANDLE hResource;
  BYTE *lpText;
  int len;

    hResource = LoadResource(hInst, FindResource(hInst, "image",
RT_RCDATA));
    lpText    = LockResource(hResource);
    len = SizeofResource(hInst, FindResource(hInst, "image", RT_RCDATA));

So lpText is pointing to the JPEG data and len is the length

To render it, you will need to convert it to a bitmap. So you will need to allocate some memory the size of the image plus the size of the BITMAPINFOHEADER.

In  the BITMAPINFOHEADER set the biCompression to BI_JPEG

Thank you both. Yeah I've been trying to keep it pure GDI, no MFC, no GDI+ and so far so good. Now I've got lots more to chew on. I will post again when I make some progress.

Thanks,
Erik