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GetBitMapAttr -- Returns information about a bitmap (V39)
value=GetBitMapAttr(bitmap,attribute_number);
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ULONG GetBitMapAttr(struct BitMap *,ULONG);
Determines information about a bitmap. This function should be used
instead of reading the bitmap structure fields directly. This will
provide future compatibility.
bm = A pointer to a BitMap structure.
attribute_number = A number telling graphics which attribute
of the bitmap should be returned:
BMA_HEIGHT returns the height in pixels
BMA_WIDTH returns the width in pixels.
BMA_DEPTH returns the depth. This is the number of
bits which are required to store the information
for one pixel in the bitmap.
BMA_FLAGS returns a longword bitfield describing
various attributes which the bitmap may have.
Currently defined flags are BMF_DISPLAYABLE,
BMF_INTERLEAVED (see AllocBitMap()). The flag
BMF_STANDARD returns will be set if the
bitmap is represented as planar data in Amiga
Chip RAM.
Unknown attributes are reserved for future use, and return zero.
BMF_DISPLAYABLE will only be set if the source bitmap meets all of the
required alignment restrictions. A bitmap which does not meet these
restrictions may still be displayable at some loss of efficiency.
Size values returned by this function may not exactly match the values
which were passed to AllocBitMap(), due to alignment restrictions.
AllocBitMap()
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