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DarkBASIC Professional Discussion / Assembling a DWORD

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Rob K
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Posted: 7th Jun 2003 16:05 Edited at: 7th Jun 2003 16:06
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Just a quick question.

Is there a command / short method to assemble a DWORD given four byte values?

I need this because the RGB command only allows you to specify the 3 colour values, not the fourth one for alpha (which is set to 255)

If there isn't a way of doing this its DLL time

I know this is possible using memblocks to write the alpha value, but for P5 I'll need this anyway.

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MrTAToad
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Posted: 7th Jun 2003 16:08
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You would have to do the following :

From DWORD to bytes :

Part 1 = (value) & 0xFF
Part 2 = (value>>8) & 0xFF
Part 3 = (value>>16) & 0xFF
Part 4 = (value>>24) & 0xFF

Bytes to DWORD :

DWORD=(Part4<<24) | (Part3<<16) | (Part2<<8) | Part1

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Shadow Robert
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Posted: 7th Jun 2003 16:15
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DWORD = (Alpha<<24) + (Blue<<16) + (Green<<8) + Red
thats all you need ... unpacking though is a different matter entirely - but i'm sure if you search for BitRanging you'll find a function for it

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Rob K
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Posted: 7th Jun 2003 16:17 Edited at: 7th Jun 2003 16:19
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Never mind - You can do it using memblocks

For unpacking DWORDS I just write the dword to a memblock and then read it byte by byte.

Sorry to bother everyone.

I'll probably make a DLL for convenience though.

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Rob K
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Posted: 7th Jun 2003 16:27
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Not very efficient - Toady's way is far better naturally - But what the heck



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MrTAToad
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Posted: 7th Jun 2003 18:45
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Hmmm... might be worth doing a DLL before anyone else gets there...

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IanM
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Posted: 7th Jun 2003 19:19 Edited at: 7th Jun 2003 19:20
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Why?



For the other extraction routines, use RGBR(), RGBG() and RGBB()
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MrTAToad
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Posted: 7th Jun 2003 19:37
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'Cos I can...

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Rob K
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Posted: 7th Jun 2003 21:21
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@Ian

Because...

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IanM
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Posted: 7th Jun 2003 21:36
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Bighead
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Posted: 7th Jun 2003 22:32
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@Ian:

When you use RGBB() routine on the obtained Dword the result is 0.
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IanM
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Posted: 7th Jun 2003 23:34
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... a bug I wasn't aware of ... is Lee?
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Rob K
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Posted: 8th Jun 2003 00:26
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It isn't a bug with DBP I don't think. This source code works fine:



as does with my routine:



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Bighead
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Posted: 8th Jun 2003 00:34
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Well, I used Ian's code. You can find it below ...
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IanM
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Posted: 8th Jun 2003 01:56
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Doh!

Damned case-insensitivity. My bad!

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Shadow Robert
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Posted: 8th Jun 2003 02:09
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hehee... yeah, that is kinda weird to get used to isn't it lol
who knew there we so many ways of doing the exact same thing over and over again

you know you could use mempointers to



god the fun you can have hehee ... knowing me i've probably just got them in the wrong order - but it still makes sense

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MrTAToad
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Posted: 8th Jun 2003 03:16
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Trifle inefficient though...
By the way, the source code for SystemTray is in the code section.

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Bighead
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Posted: 8th Jun 2003 04:02
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Ok, thanks everyone!!! [img]x-d [/img]
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Shadow Robert
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Posted: 8th Jun 2003 10:23
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hehee... alright cool Toad
and perhaps might be inefficient but it never ceases to suprise me just how many ways there are to do things until you really think about it.

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MrTAToad
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Posted: 8th Jun 2003 13:37
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Yes, there are usually so many ways to solve a problem, its daft...

Good news everyone! I really am THAT good...
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