Always expose the error to compare it, and do not build on unsupporte…

…d arch

Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

screenshot.go

@@ -3,9 +3,14 @@
 package screenshot
 
 import (
+	"errors"
 	"image"
 )
 
+// ErrUnsupported is returned when the platform or architecture used to compile the program
+// does not support screenshot, e.g. if you're compiling without CGO on Darwin
+var ErrUnsupported = errors.New("screenshot does not support your platform")
+
 // CaptureDisplay captures whole region of displayIndex'th display, starts at 0 for primary display.
 func CaptureDisplay(displayIndex int) (*image.RGBA, error) {
 	rect := GetDisplayBounds(displayIndex)

screenshot_supported.go

@@ -1,4 +1,4 @@
-//go:build !darwin && !windows && (linux || freebsd || openbsd || netbsd)
+//go:build !s390x && !ppc64le && !darwin && !windows && (linux || freebsd || openbsd || netbsd)
 
 package screenshot
 

screenshot_unsupported.go

@@ -1,14 +1,11 @@
-//go:build !(cgo && darwin) && !windows && !linux && !freebsd && !openbsd && !netbsd
+//go:build s390x || ppc64le || (!(cgo && darwin) && !windows && !linux && !freebsd && !openbsd && !netbsd)
 
 package screenshot
 
 import (
-	"errors"
 	"image"
 )
 
-var ErrUnsupported = errors.New("screenshot does not support your platform")
-
 // Capture returns screen capture of specified desktop region.
 // x and y represent distance from the upper-left corner of primary display.
 // Y-axis is downward direction. This means coordinates system is similar to Windows OS.