get_alpha() [1/2]

const xtd::byte * xtd::drawing::image::get_alpha

(

)

const

Gets the image alpha pointer, which represents the alpha data of the image.

Returns

The pointer or alpha image.

Remarks

The size of this data is 1 byte (alpha) * height() * width().

If the image has no handle, such as an empty image, this method returns nullptr.

Warning

Be careful when using this pointer as there is no control and you can exceed its size and create irreparable problems.

Remarks

To access the position of a specific pixel, it's best to use the xtd::drawing::image::get_pixel and xtd::drawing::image::set_pixel methods.