X backend uses Close method instead of Destroy to free canvas

go.mod

@@ -3,11 +3,8 @@ module git.tebibyte.media/tomo/backend
 go 1.20
 
 require (
-	git.tebibyte.media/tomo/tomo v0.34.0
+	git.tebibyte.media/tomo/tomo v0.35.0
 	git.tebibyte.media/tomo/typeset v0.7.1
-)
-
-require (
 	git.tebibyte.media/tomo/xgbkb v1.0.1
 	github.com/jezek/xgb v1.1.1
 	github.com/jezek/xgbutil v0.0.0-20231116234834-47f30c120111

go.sum

@@ -1,6 +1,6 @@
 git.tebibyte.media/sashakoshka/xgbkb v1.0.0/go.mod h1:pNcE6TRO93vHd6q42SdwLSTTj25L0Yzggz7yLe0JV6Q=
-git.tebibyte.media/tomo/tomo v0.34.0 h1:r5yJPks9rtzdDI2RyAUdqa1qb6BebG0QFe2cTmcFi+0=
+git.tebibyte.media/tomo/tomo v0.35.0 h1:1XvcUcWg1rBZXov3KfuX6VfiuBQ2mcJHIslHMLn07no=
-git.tebibyte.media/tomo/tomo v0.34.0/go.mod h1:C9EzepS9wjkTJjnZaPBh22YvVPyA4hbBAJVU20Rdmps=
+git.tebibyte.media/tomo/tomo v0.35.0/go.mod h1:C9EzepS9wjkTJjnZaPBh22YvVPyA4hbBAJVU20Rdmps=
 git.tebibyte.media/tomo/typeset v0.7.1 h1:aZrsHwCG5ZB4f5CruRFsxLv5ezJUCFUFsQJJso2sXQ8=
 git.tebibyte.media/tomo/typeset v0.7.1/go.mod h1:PwDpSdBF3l/EzoIsa2ME7QffVVajnTHZN6l3MHEGe1g=
 git.tebibyte.media/tomo/xgbkb v1.0.1 h1:b3HDUopjdQp1MZrb5Vpil4bOtk3NnNXtfQW27Blw2kE=

internal/system/box.go

@@ -19,6 +19,8 @@ type box struct {
 	parent parent
 	outer  anyBox
 
+	role tomo.Role
+
 	bounds              image.Rectangle
 	minSize             image.Point
 	userMinSize         image.Point
@@ -106,6 +108,10 @@ func (this *box) MinimumSize () image.Point {
 	return this.minSize
 }
 
+func (this *box) Role () tomo.Role {
+	return this.role
+}
+
 func (this *box) borderSum () tomo.Inset {
 	sum := tomo.Inset { }
 	for _, border := range this.border {
@@ -182,6 +188,10 @@ func (this *box) SetPadding (padding tomo.Inset) {
 	this.invalidateMinimum()
 }
 
+func (this *box) SetRole (role tomo.Role) {
+	this.role = role
+}
+
 func (this *box) SetDNDData (dat data.Data) {
 	this.dndData = dat
 }

internal/system/system.go

@@ -15,8 +15,6 @@ type System struct {
 type BackendLink interface {
 	// NewTexture creates a new texture from an image.
 	NewTexture (image.Image) canvas.TextureCloser
-	// NewCanvas creates a new blank canvas with the specified bounds.
-	NewCanvas  (image.Rectangle) canvas.Canvas
 	// NewSurface creates a new surface with the specified bounds.
 	NewSurface (image.Rectangle) (SurfaceLink, error)
 }

x/backend.go

@@ -31,10 +31,6 @@ func (this *backendLink) NewTexture (source image.Image) canvas.TextureCloser {
 	return this.backend.NewTexture(source)
 }
 
-func (this *backendLink) NewCanvas (bounds image.Rectangle) canvas.Canvas {
-	return this.backend.NewCanvas(bounds)
-}
-
 func (this *backendLink) NewSurface (bounds image.Rectangle) (system.SurfaceLink, error) {
 	// TODO
 	return nil, errors.New("x: not implemented")
@@ -126,7 +122,7 @@ func (this *Backend) NewTexture (source image.Image) canvas.TextureCloser {
 	return xcanvas.NewTextureFrom(source)
 }
 
-func (this *Backend) NewCanvas (bounds image.Rectangle) canvas.Canvas {
+func (this *Backend) NewCanvas (bounds image.Rectangle) canvas.CanvasCloser {
 	return xcanvas.NewCanvas(this.x, bounds)
 }
 

x/canvas/canvas.go

@@ -49,9 +49,10 @@ func (this *Canvas) Push (window xproto.Window) {
 }
 
 // Close frees this canvas from the X server.
-func (this *Canvas) Close () {
+func (this *Canvas) Close () error {
 	this.assert()
 	this.Image.Destroy()
+	return nil
 }
 
 func (this *Canvas) assert () {

x/window.go

@@ -361,7 +361,7 @@ func (this *window) reallocateCanvas () {
 	
 	if larger || smaller {
 		if this.xCanvas != nil {
-			this.xCanvas.Destroy()
+			this.xCanvas.Close()
 		}
 		this.xCanvas = xcanvas.NewCanvasFrom(xgraphics.New (
 			this.backend.x,