How to draw the picture from 2D Array in MFC?

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Hi i want to generate in VC++ an image (Bitmap) from a 2D array of numerical value Array[1024][1024] that each value is a RGB from 0 to 255. is there any VC++ function to do this?

Thanks in Advance.

Posted 13-May-13 4:31am

Rajeshkumar Ramasamy

Updated 28-May-13 1:28am

v3

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Sergey Alexandrovich Kryukov 13-May-13 10:33am

What did you try so far?
—SA

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Iain Clarke, Warrior Programmer · Accepted Answer · 2013-05-13T04:47:00

Solution 1

Have a look at SetDIBitsToDevice Win32 function:
http://msdn.microsoft.com/en-us/library/windows/desktop/dd162974(v=vs.85).aspx

It's a very old one, and one I used to do the same job you are doing - I had a 2d array of 8bit signal strength, and that mapped to a pallette of colours. In your case, the colours will be greyscale, but there's no reason they need to be.

One "gotcha" I can think of - the data will have to be a multiple of 4 bytes wide, but as your data is 1024x1024, that's no problem.
Another is that I seem to remember it painting the image upside down, but you can play with the coordinates to see how it works.

MSDN claims support from Win2000, but I was using this function in Windows 3.1, so it's very ancient, very tricky, and very powerful.

Good luck!

Iain.

Posted 13-May-13 4:47am

Iain Clarke, Warrior Programmer

Comments

Sergey Alexandrovich Kryukov 13-May-13 10:57am

Sounds good, 5ed.
—SA

Rajeshkumar Ramasamy 15-May-13 2:11am

Are you have any example for SetDIBitsToDevice?

Iain Clarke, Warrior Programmer 15-May-13 3:01am

There's an example linked from the website I showed above, but I agree it's not very clear.

Unfortunately, any code I can paste in here belongs to previous customers, but I can recommend just looking at the msdn pages, and for BITMAPINFO structure too.

Rajeshkumar Ramasamy 15-May-13 3:30am

Iain Clarke,
I think you understand my question.
I have only a 2D Array (1024 x 1024), which contains the RGB colors.
My question is, I want to plot these array of pixel into picture box or bitmap, whatever at a time, Now I am using loop for drawing the same, It take more CPU utilization.
But, In SetDIBitsToDevice, We can copy the from a bitmap to destination, Am I right?

Iain Clarke, Warrior Programmer 15-May-13 3:40am

I guess you have a CDC of some sorts, and are doing SetPixel in a loop?

If so, throw the loop away, and do:
::SetDIBitsToDevice (*pDC, ...., &m_pBlockOfBytes, &m_bmiPrePreparedBitmapStructure, DIB_RGB_COLORS);

Your block of bytes is where your numerical values are - bytes 0-1024, followed by bytes 1040-2047, and so on. It's not quite the same as a 1040x1024 array, but it's equivalent.

You can also prepare your bitmap array in advance too:
m_pbmi = (BITMAPINFO *)malloc (sizeof (BITMAPINFOHEADER) + 256 * sizeof (RGBQUAD));
ZeroMemory (m_pbmi, sizeof (BITMAPINFOHEADER) + 256 * sizeof (RGBQUAD));
m_pbmi->bmiHeader.... = ...;
for (int n = 0; n < 256; n++)
{
m_pbmi->bmiColors [n].rgbRed = n;
m_pbmi->bmiColors [n].rgbGreen = n;
m_pbmi->bmiColors [n].rgbBlue = n;
}

As I said before, this is a complex function, but powerful. Once you've done the initial setup work, you can just change one of your data bytes, invalidate your window, and in your paint / ondraw function, you can just call the one line setdibitstodevice function, and you're done!

It's MILES faster than 1 million setpixels.

Iain.

Rajeshkumar Ramasamy 20-May-13 4:51am

Iain Clarke,
Thanks for your previous quick reply.

Bitmap pixel format have the color format in the order of blue, green, red.
I am containing the 2D array, which contains the value in the order of red, green and blue.
When I am print the 2D array, the color pattern is not look like what I want.
How can I map the My RGB format to BGR?

Rajesh

Iain Clarke, Warrior Programmer 20-May-13 4:58am

Didn't you say your data is 1 byte, and greyscale?

In which case, R=G=B!

But I think the confusion may be in how intel stores numbers:
0x12345678 stored in ram becomes: 78 56 34 12

Trust me, you can use COLORREF type and RGB macro for this.

Iain.

Rajeshkumar Ramasamy 21-May-13 6:26am

Iain,
One more doubt,
As said earlier, I have the pixel array (24 bpp format & 1024x1024) contains the RGB values, but It has no padding byte values.
How can I add Padding Bytes (24 bpp format) into the pixel array?

Iain Clarke, Warrior Programmer 21-May-13 6:38am

You: "each value is a gray level from 0 to 255"... sounds like 1 byte to me!

As you have 1024 pixels, your data is already a multiple of 4, so I don't think you need padding. You might have the values in the BITMAPHEADER wrong? And maybe you're saying you;re using a palette, when your data is already in colour?

I'd start with a simple 16x16 array, with all colours being simple, and work up from there. If your 24 bit colour values are "backwards", then you might just have to copy them to another buffer, re-arranging them as you go.

Iain.

Rajeshkumar Ramasamy 22-May-13 3:28am

Iain,
Still problem is there.
If you don't mind, give your email, I will send the Outputs (what exactly I want & what I have now). Otherwise Can I upload the image here?
The problem is, I got the picture, but some alignment problem is there.

Rajesh

Rajeshkumar Ramasamy 23-May-13 2:00am

Iain,

I solved It:-)
Thanks for your co operation.

Rajesh

Rajeshkumar Ramasamy 27-May-13 10:03am

Iain,

Are you aware of Alpha Blend function?
I want to draw the Transparent BITMAP, As said earlier i have the pixel array that containing the RGB and Alpha value. But transparency not happening..

Regards,
Rajesh.

H.Brydon 28-May-13 14:59pm

+5 for all the effort.