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davenovo
USA
26 Posts |
 Posted - Jan 18 2014 : 15:39:52
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| Is there a way to ensure that ieMemory will store all the picture data as a single block all the time. The reason being I am going to be passing the memory block to other DLLS for processing and these DLLS need the memory to be in a contiguous block. I know I can go through the scanlines and copy them to a contiguous block, but I would rather just have imageEn keep it contiguous. |
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quantuz
Sweden
55 Posts |
Posted - Jan 28 2014 : 15:31:01
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Hi!
I have had the same problem needed all data in the same memory block, and Fabrizio had a solution for us som yease ago, sending a copy of what Fabrizio replied
--------------------------------------------------
Let me analyze with attention every email I received (from you and from Christer) about this problem, so pardon me if it will take some time.
First of all, I see:
TRGB48 * ie48ptr =
(TRGB48*)bitmap->iEBitmapPtr_->ScanLine[bitmap->height_-1];
TRGB48 val48;
for (y=0; y<bitmap->height_; y++)
for (x=0; x<bitmap->width_; x++)
val48 = ie48ptr[y*bitmap->stepBytes_/6+x]; //CG protest here
}
that code supposes that Scanline[height-1] returns a continuous block of memory: it is not always true!
If there isn't enough continue free space, ImageEn will allocate the image in chunks.
To avoid this behavior, I have to introduce another public field (like the other iegAutoLocateOnDisk), which disables this "feature". This time it is named "iegAutoFragmentBitmap".
So, for your necessities you have to set:
iegAutoFragmentBitmap = false;
iegAutoLocateOnDisk = false;
That must be done before allocate or use TIEBitmap objects.
Please accept my apologies if I done error or if I don't understood what you actually mean.
Regards,
Fabrizio
---------------------------------
Hi,
sorry I cannot understand this question:
> How can we decide if a memory-located bitmap is segmented ?
do you mean "How can we know..."?
In this case there isn't a property to know it.
In the attached version I added TIEBitmap.FragmentsCount property: if it is >1 then the image is fragmented.
Hope this helps.
Regards,
Fabrizio
--------------------
Best regards,
//Christer
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davenovo
USA
26 Posts |
Posted - Jan 30 2014 : 14:25:41
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Hi Nigel,
It seems there are some options there, i.e. IEGlobalSettings().AutoFragmentBitmap and it does seem like it at least TIEBitmap.AllocateImage tries to allocate a while block first and only does fragments if that fails.
Are you sure that there is no way to do this. Looking further, it seems allocating as a block is the default behavior. |
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