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#1 Posted : Tuesday, July 4, 2006 9:32:37 AM(UTC)


Groups: Registered
Posts: 1


    I tried to create a LBitmapBase with random size
image and I got the -13 error (Invalid parameter passed). It seems that
using images with a width that are a multiple of 4 works well. So, I
would like to know the real restrictions on size of images that can be
created with the function Create of LBitmapBase without having any error.

    Thank you,


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#2 Posted : Tuesday, July 4, 2006 10:32:36 AM(UTC)


Groups: Manager, Tech Support
Posts: 367

You can have any bitmap width, but if the bytes per row (BytesPerLine) are not a multiple of 4 bytes (32-bit), you must allocate a little more to align. Here's how to calculate the needed bytes per line in C/C++ using integer arithmetic:
int nBytesPerLine = (((nWidth*nbisPerPixel)+31)/32)*4;
where nWidth and nbisPerPixel are both integer values.
The total buffer size will be nBytesPerLine*imageHeight.

The extra bits (from zero to 31 in number) will not be used or displayed.

Amin Dodin

Senior Support Engineer
LEAD Technologies, Inc.
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