Re: Restrictions of creation size for a LBitmap

Hi,


    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,

David

David,
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.