CrystGLFW::Window::Image

A CrystGLFW::Window::Image (or Image for the purposes of this guide) can be used both for a custom cursor image and for a window's icon.

You can create an Image with the new method:

width, height = 16, 16
white = 255
pixels = Array(UInt8).new(width * height, white)
image = CrystGLFW::Window::Image.new(width, height, pixels)

The initializer takes the following arguments:

• width, the width of the image, in pixels.
• height, the height of the image, in pixels.
• pixels, an Array(UInt8) that should be width x height in length.

You'll need to use another library to extract the pixel data from various image formats. The pixel data in pixels should be arranged left-to-right, top-to-bottom.

size and pixels

Image has only two public methods, both of which merely expose the attributes given to it upon initialization:

width, height = 16, 16
white = 255
pixels = Array(UInt8).new(width * height, white)
image = CrystGLFW::Window::Image.new(width, height, pixels)

image.size # => {width: 16, height: 16}
image.pixels # => Array(UInt8)

size and pixels must be called from within a run block definition.