Cogl.Framebuffer.prototype.set_viewport

function set_viewport(x: Number(gfloat), y: Number(gfloat), width: Number(gfloat), height: Number(gfloat)): void {
    // Gjs wrapper for cogl_framebuffer_set_viewport()
}
  

Defines a scale and offset for everything rendered relative to the top-left of the destination framebuffer.

By default the viewport has an origin of (0,0) and width and height that match the framebuffer's size. Assuming a default projection and modelview matrix then you could translate the contents of a window down and right by leaving the viewport size unchanged by moving the offset to (10,10). The viewport coordinates are measured in pixels. If you left the x and y origin as (0,0) you could scale the windows contents down by specify and width and height that's half the real size of the framebuffer.

<note>Although the function takes floating point arguments, existing drivers only allow the use of integer values. In the future floating point values will be exposed via a checkable feature.</note>

Since 1.8