There is only one type of buffer now

application.go

@@ -4,7 +4,7 @@ import "image"
 
 // Application represents an application.
 type Application struct {
-	DamageBuffer
+	Buffer
 	
 	title string
 	icons []image.Image
@@ -22,7 +22,7 @@ func (application *Application) Run () (
 	width, height := application.Size()
 	if width  < 1 { width  = 80 }
 	if height < 1 { height = 20 }
-	application.DamageBuffer.SetSize(width, height)
+	application.Buffer.SetSize(width, height)
 
 	application.config.load()
 

backends/x/event.go

@@ -33,10 +33,6 @@ func (backend *Backend) handleConfigureNotify (
 		configureEvent =
 			backend.compressConfigureNotify(configureEvent)
 
-		// we should not resize the canvas while drawing is taking place
-		backend.drawLock.Lock()
-		defer backend.drawLock.Unlock()
-
 		// resize buffer
 		width, height := backend.calculateBufferSize()
 		backend.application.SetSize(width, height)

buffer.go

@@ -51,9 +51,14 @@ func (cell Cell) Rune () (content rune) {
 	return
 }
 
-// Buffer is a basic grid of cells.
+// Buffer is a two dimensional text buffer that stores a grid of cells, as well
+// as information stating whether each cell is clean or dirty. Cells are dirty
+// by default, are only clean when marked as clean, and become dirty again when
+// they are altered in some way.
 type Buffer struct {
 	content []Cell
+	clean   []bool
+	
 	width  int
 	height int
 	Dot struct {
@@ -78,16 +83,11 @@ func (buffer *Buffer) Size () (width, height int) {
 	return
 }
 
-// SetSize sets the width and height of the buffer. This clears all data in the
-// buffer. If the width or height is negative, this method does nothing.
-func (buffer *Buffer) SetSize (width, height int) {
-	if width < 0 || height < 0 { return }
-	buffer.width   = width
-	buffer.height  = height
-	buffer.content = make([]Cell, width * height)
-	for index := 0; index < len(buffer.content); index ++ {
-		buffer.content[index].color = ColorForeground
-	}
+// ResetDot is a convenience method to reset the dot to the buffer origin point
+// (0, 0).
+func (buffer *Buffer) ResetDot () {
+	buffer.Dot.X = 0
+	buffer.Dot.Y = 0
 }
 
 // Cell returns the cell at the specified x and y coordinates. If the
@@ -101,19 +101,38 @@ func (buffer *Buffer) Cell (x, y int) (cell Cell) {
 // SetColor sets the color of the cell at the specified x and y coordinates.
 func (buffer *Buffer) SetColor (x, y int, color Color) {
 	if buffer.isOutOfBounds(x, y) { return }
-	buffer.content[x + y * buffer.width].color = color
+	index := x + y * buffer.width
+	buffer.clean[index] = buffer.content[index].color == color
+	buffer.content[index].color = color
+}
+
+// SetSize sets the width and height of the buffer. This clears all data in the
+// buffer. If the width or height is negative, this method does nothing.
+func (buffer *Buffer) SetSize (width, height int) {
+	if width < 0 || height < 0 { return }
+	buffer.width   = width
+	buffer.height  = height
+	buffer.content = make([]Cell, width * height)
+	buffer.clean   = make([]bool, width * height)
+	for index := 0; index < len(buffer.content); index ++ {
+		buffer.content[index].color = ColorForeground
+	}
 }
 
 // SetStyle sets the style of the cell at the specified x and y coordinates.
 func (buffer *Buffer) SetStyle (x, y int, style Style) {
 	if buffer.isOutOfBounds(x, y) { return }
-	buffer.content[x + y * buffer.width].style = style
+	index := x + y * buffer.width
+	buffer.clean[index] = buffer.content[index].style == style
+	buffer.content[index].style = style
 }
 
 // SetRune sets the rune of the cell at the specified x and y coordinates.
 func (buffer *Buffer) SetRune (x, y int, content rune) {
 	if buffer.isOutOfBounds(x, y) { return }
-	buffer.content[x + y * buffer.width].content = content
+	index := x + y * buffer.width
+	buffer.clean[index] = buffer.content[index].content == content
+	buffer.content[index].content = content
 }
 
 // Write writes data stored in a byte slice to the buffer at the current dot
@@ -131,78 +150,16 @@ func (buffer *Buffer) Write (bytes []byte) (bytesWritten int, err error) {
 	return
 }
 
-// ResetDot is a convenience method to reset the dot to the buffer origin point
-// (0, 0).
-func (buffer *Buffer) ResetDot () {
-	buffer.Dot.X = 0
-	buffer.Dot.Y = 0
-}
-
-// DamageBuffer is a special buffer that keeps track of damage information.
-// Cells are dirty by default, are only clean when marked as clean, and become
-// dirty again when they are altered in some way.
-type DamageBuffer struct {
-	Buffer
-	clean []bool
-}
-
-// SetSize sets the width and height of the buffer. This clears all data in the
-// buffer. If the width or height is negative, this method does nothing.
-func (buffer *DamageBuffer) SetSize (width, height int) {
-	if width < 0 || height < 0 { return }
-	buffer.Buffer.SetSize(width, height)
-	buffer.clean = make([]bool, width * height)
-}
-
-// SetColor sets the color of the cell at the specified x and y coordinates.
-func (buffer *DamageBuffer) SetColor (x, y int, color Color) {
-	if buffer.isOutOfBounds(x, y) { return }
-	index := x + y * buffer.width
-	buffer.clean[index] = buffer.content[index].color == color
-	buffer.Buffer.SetColor(x, y, color)
-}
-
-// SetStyle sets the style of the cell at the specified x and y coordinates.
-func (buffer *DamageBuffer) SetStyle (x, y int, style Style) {
-	if buffer.isOutOfBounds(x, y) { return }
-	index := x + y * buffer.width
-	buffer.clean[index] = buffer.content[index].style == style
-	buffer.Buffer.SetStyle(x, y, style)
-}
-
-// SetRune sets the rune of the cell at the specified x and y coordinates.
-func (buffer *DamageBuffer) SetRune (x, y int, content rune) {
-	if buffer.isOutOfBounds(x, y) { return }
-	index := x + y * buffer.width
-	buffer.clean[index] = buffer.content[index].content == content
-	buffer.Buffer.SetRune(x, y, content)
-}
-
-// Write writes data stored in a byte slice to the buffer at the current dot
-// position. This makes DamageBuffer an io.Writer.
-func (buffer *DamageBuffer) Write (bytes []byte) (bytesWritten int, err error) {
-	text := string(bytes)
-	bytesWritten = len(bytes)
-	
-	for _, character := range text {
-		buffer.SetRune(buffer.Dot.X, buffer.Dot.Y, character)
-		buffer.Dot.X ++
-		if buffer.Dot.X > buffer.width { break }
-	}
-	
-	return
-}
-
 // Clean returns whether or not the cell at the specified x and y coordinates is
 // clean.
-func (buffer *DamageBuffer) Clean (x, y int) (clean bool) {
+func (buffer *Buffer) Clean (x, y int) (clean bool) {
 	if buffer.isOutOfBounds(x, y) { return }
 	clean = buffer.clean[x + y * buffer.width]
 	return
 }
 
 // MarkClean marks the cell at the specified x and y coordinates as clean.
-func (buffer *DamageBuffer) MarkClean (x, y int) {
+func (buffer *Buffer) MarkClean (x, y int) {
 	if buffer.isOutOfBounds(x, y) { return }
 	buffer.clean[x + y * buffer.width] = true
 }

config.go

@@ -42,7 +42,6 @@ func (config *Config) FontName () (fontName string) {
 }
 
 func (config *Config) load () {
-	// TODO: load these from a file
 	config.colors = [8]color.Color {
 		// background
 		color.RGBA { R: 0, G: 0, B: 0, A: 0 },