Converts a bitmap to 32 bits. A clone of the input bitmap is returned for 32-bit bitmaps.
For 48-bit RGB images, conversion is done by dividing each 16-bit channel by 256 and by setting the alpha channel to an opaque value (0xFF). For 64-bit RGBA images, conversion is done by dividing each 16-bit channel by 256. A NULL value is returned for other nonstandard bitmap types.
Converts a bitmap to 32 bits. A clone of the input bitmap is returned for 32-bit bitmaps. For 48-bit RGB images, conversion is done by dividing each 16-bit channel by 256 and by setting the alpha channel to an opaque value (0xFF). For 64-bit RGBA images, conversion is done by dividing each 16-bit channel by 256. A NULL value is returned for other nonstandard bitmap types.