Added New{Memory,Video}Bitmap functions to create memory/video bitmap directly.

Added new bitmap flags to New{Memory,Bitmap,}Bitmap methods.

allegro5/bitmap.go

@@ -51,8 +51,17 @@ type Rotation struct {
 	Center bool
 }
 
-// NewBitmap creates a new bitmap of given width and height
-func NewBitmap(width, height int) (*Bitmap, error) {
+func newBitmap(width, height int, mut func(m FlagMutation), flags []NewBitmapFlag) (*Bitmap, error) {
+	var newBmpFlags = CaptureNewBitmapFlags()
+	defer newBmpFlags.Revert()
+	newBmpFlags.Mutate(func(m FlagMutation) {
+		if nil != mut {
+			mut(m)
+		}
+		for _, f := range flags {
+			m.Set(f)
+		}
+	})
 	b := C.al_create_bitmap(C.int(width), C.int(height))
 	if nil == b {
 		return nil, errors.New("error creating bitmap")
@@ -60,6 +69,27 @@ func NewBitmap(width, height int) (*Bitmap, error) {
 	return &Bitmap{b, width, height}, nil
 }
 
+// NewBitmap creates a new bitmap of given width and height and optional flags
+func NewBitmap(width, height int, flags ...NewBitmapFlag) (*Bitmap, error) {
+	return newBitmap(width, height, nil, flags)
+}
+
+// NewVideoBitmap creates a new video bitmap of given width and height and optional flags
+func NewVideoBitmap(width, height int, flags ...NewBitmapFlag) (*Bitmap, error) {
+	return newBitmap(width, height, func(m FlagMutation) {
+		m.Unset(NewBitmapFlagMemoryBitmap)
+		m.Set(NewBitmapFlagVideoBitmap)
+	}, flags)
+}
+
+// NewMemoryBitmap creates a new video bitmap of given width and height and optional flags
+func NewMemoryBitmap(width, height int, flags ...NewBitmapFlag) (*Bitmap, error) {
+	return newBitmap(width, height, func(m FlagMutation) {
+		m.Unset(NewBitmapFlagVideoBitmap)
+		m.Set(NewBitmapFlagMemoryBitmap)
+	}, flags)
+}
+
 // NewBitmapFromImage creates a new bitmap starting from a Go native image (image.Image)
 func NewBitmapFromImage(im image.Image, video bool) (*Bitmap, error) {
 	var newBmpFlags = CaptureNewBitmapFlags()