LBitmapBase::Allocate
#include "ltwrappr.h"
virtual L_INT LBitmapBase::Allocate(nMemoryType=TYPE_CONV)
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L_INT nMemoryType; |
/* type of memory */ |
Allocates memory for the bitmap data.
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Parameter |
Description |
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nMemoryType |
The type of memory to be used when allocating memory for the bitmap data. Possible values are: |
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Value |
Meaning |
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TYPE_CONV |
[0x0001] Use conventional memory if the image will fit, otherwise swap to disk. |
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TYPE_USER |
[0x0002] Create a bitmap where the user maintains the data pointer. |
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TYPE_TILED |
[0x0004] Create tiled bitmaps. |
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TYPE_NOTILED |
[0x0008] Do not create tiled bitmaps, even if the conventional memory has failed. |
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TYPE_DISK |
[0x0080] Do not use conventional memory. Swap to disk only. |
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TYPE_NODISK |
[0x0100] Do not swap to disk using LEAD's virtual memory. Windows virtual memory is not affected. |
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TYPE_COMPRESSED |
[0x0200] (Document/Medical only) Allocate an RLE-compressed bitmap. This flag can be used with TYPE_CONV or TYPE_NODISK. For more information, refer to Speeding Up 1-Bit Documents. |
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TYPE_SUPERCOMPRESSED |
[0x0400] (Document/Medical only) Keep images compressed in memory. This option causes slow access, but very low memory usage. This option is available only for 1-bit, 8-bit grayscale and 24-bit images. |
Returns
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SUCCESS |
The function was successful. |
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< 1 |
An error occurred. Refer to Return Codes. |
Comments
The amount of memory allocated depends on the size of the image indicated in the internal bitmap handle (Width, Height, and BitsPerPixel). LBitmapBase::Initialize must be called prior to calling this function.
This is a low-level function that is used only when you create a bitmap from scratch using LBitmapBase::Initialize. Normally, the functions that load or create a bitmap allocate the required memory for you. (In that case, calling Allocate() causes your application to lose memory.)
Required DLLs and Libraries
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LTDIS For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
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Functions: |
LBitmapBase::Free, LBitmapBase::Create, LBitmapBase::Initialize, Class Members |
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Topics: |
Example
LBitmapBase MyBitmap;
MyBitmap.Initialize(100,200,24);
MyBitmap.Allocate(TYPE_CONV);
if(MyBitmap.IsAllocated())
MyBitmap.Free();