Merge branch 'image-buffer' of git.tebibyte.media:sashakoshka/stone into image-buffer

application.go

@@ -11,6 +11,7 @@ type Application struct {
 	backend Backend
 	config Config
 	callbackManager CallbackManager
+	imageManager ImageManager
 }
 
 // Run initializes the application, starts it, and then returns a channel that
@@ -33,60 +34,42 @@ func (application *Application) Run () (
 	return
 }
 
-// OnQuit registers an event handler to be called just before the application
-// quits. This can happen when the user closes the application, or the backend
-// experiences an unrecoverable error.
 func (application *Application) OnQuit (
 	onQuit func (),
 ) {
 	application.callbackManager.onQuit = onQuit
 }
 
-// OnPress registers an event handler to be called when a key or mouse button
-// is pressed.
 func (application *Application) OnPress (
-	onPress func (button Button, modifiers Modifiers),
+	onPress func (button Button),
 ) {
 	application.callbackManager.onPress = onPress
 }
 
-// OnPress registers an event handler to be called when a key or mouse button
-// is released.
 func (application *Application) OnRelease (
 	onRelease func (button Button),
 ) {
 	application.callbackManager.onRelease = onRelease
 }
 
-// OnResize registers an event handler to be called when the application window
-// is resized. After the event handler is called, any updates it makes will
-// automatically be pushed to the screen.
 func (application *Application) OnResize (
 	onResize func (),
 ) {
 	application.callbackManager.onResize = onResize
 }
 
-// OnMouseMove registers an event handler to be called when mouse motion is
-// detected. The coordinates of the cell that the mouse now hovers over are
-// given as input.
 func (application *Application) OnMouseMove (
 	onMouseMove func (x, y int),
 ) {
 	application.callbackManager.onMouseMove = onMouseMove
 }
 
-// OnScroll registers an event handler to be called when the user uses the mouse
-// scroll wheel. Horizontal and vertical amounts are given as input.
 func (application *Application) OnScroll (
 	onScroll func (x, y int),
 ) {
 	application.callbackManager.onScroll = onScroll
 }
 
-// OnStart registers an event handler to be called once when the application
-// starts, right before the first time updates are pushed to the screen.
-// Anything done in here will be the first thing to appear on screen.
 func (application *Application) OnStart (
 	onStart func (),
 ) {
@@ -138,3 +121,21 @@ func (application *Application) Config () (config *Config) {
 	config = &application.config
 	return
 }
+
+// AddImage adds a new image buffer and returns a pointer to it.
+func (application *Application) NewImage () (im *ColorImage) {
+	cellWidth, cellHeight := application.backend.CellMetrics()
+	im = &ColorImage {
+		cellWidth:  cellWidth,
+		cellHeight: cellHeight,
+	}
+	application.imageManager.Add(im)
+	return
+}
+
+// Remove removes the specified image buffer, if the application has it. If the
+// image was found and removed, removed will be true.
+func (application *Application) RemoveImage (im *ColorImage) (removed bool) {
+	removed = application.imageManager.Remove(im)
+	return
+}

backend.go

@@ -3,54 +3,18 @@ package stone
 import "image"
 import "errors"
 
-// Backend represents a backend for stone. Backends can be registered for use
-// with the RegisterBackend() function. All of the below methods MUST be thread
-// safe!
 type Backend interface {
-	// Run is the backend's event loop. It must cleanly exit when the user
-	// closes the window, but not before calling the OnQuit event. Run
-	// must call event handlers within its own event loop in a
-	// non-concurrent fashion.
-	//
-	// The OnStart event handler must run after the backend has been fully
-	// initialized, and right before updates are first pushed to the screen.
-	// Whatever the application draws from within this event handler must be
-	// the first thing that appears on-screen.
-	//
-	// The OnResize event handler must run whenever the window is resized.
-	// The backend must push updates to the screen after OnResize has been
-	// run.
-	//
-	// The backend must not push updates to the screen in any other case,
-	// except when its Draw() method is specifically called.
-	//
-	// The OnPress, OnRelease, OnMouseMove, and OnMouseScroll events are to
-	// be called when such events happen. It is reccommended to compress
-	// resize, mouse move, and mouse scroll events whenever possible to
-	// reduce the likelihood of event buildup.
-	Run ()
-
-	// SetTitle sets the application title. This will most often be the
-	// window title. This method may not always produce an effect, depending
-	// on the backend.
+	Run      ()
 	SetTitle (title string) (err error)
-
-	// SetIcon takes in a set of images of different sizes and sets the
-	// window's icon to them. This method may not always produce an effect,
-	// depending on the backend.
-	SetIcon (icons []image.Image) (err error)
-
-	// Draw pushes all updates made to the application's buffer to the
-	// screen.
-	Draw ()
+	SetIcon  (icons []image.Image) (err error)
+	Draw     ()
+	CellMetrics () (width, height int)
 }
 
-// BackendFactory must completely initialize a backend, and return it. If
-// anything goes wrong, it must stop, clean up any resources and return an
-// error so another backend can be chosen.
 type BackendFactory func (
-	application *Application,
+	application     *Application,
 	callbackManager *CallbackManager,
+	imageManager    *ImageManager,
 ) (
 	backend Backend,
 	err error,
@@ -58,7 +22,6 @@ type BackendFactory func (
 
 var factories []BackendFactory
 
-// RegisterBackend registers a backend factory.
 func RegisterBackend (factory BackendFactory) {
 	factories = append(factories, factory)
 }
@@ -66,7 +29,10 @@ func RegisterBackend (factory BackendFactory) {
 func instantiateBackend (application *Application) (backend Backend, err error) {
 	// find a suitable backend
 	for _, factory := range factories {
-		backend, err = factory(application, &application.callbackManager)
+		backend, err = factory (
+			application,
+			&application.callbackManager,
+			&application.imageManager)
 		if err == nil && backend != nil { return }
 	}
 

backends/x/draw.go

@@ -90,16 +90,17 @@ func (backend *Backend) drawRune (
 	}
 
 	if character < 32 { return }
-
+	
 	origin := backend.originOfCell(x, y + 1)
 	destinationRectangle, mask, maskPoint, _, ok := backend.font.face.Glyph (
 		fixed.Point26_6 {
 			X: fixed.I(origin.X),
-			Y: fixed.I(origin.Y),
+			Y: fixed.I(origin.Y - backend.metrics.descent),
 		},
 		character)
 
 	if !ok {
+		println("warning")
 		strokeRectangle (
 			&image.Uniform {
 				C: backend.config.Color(stone.ColorForeground),
@@ -109,7 +110,7 @@ func (backend *Backend) drawRune (
 		return
 	}
 
-	if backend.drawCellBounds {
+	if backend.drawCellBounds {	
 		strokeRectangle (
 			&image.Uniform {
 				C: backend.config.Color(stone.ColorForeground),
@@ -117,71 +118,17 @@ func (backend *Backend) drawRune (
 			backend.canvas,
 			backend.boundsOfCell(x, y))
 	}
-
-	// cue a series of pointless optimizations
-	alphaMask, isAlpha := mask.(*image.Alpha)
-	if isAlpha {
-		backend.sprayRuneMaskAlpha (
-			alphaMask, destinationRectangle,
-			maskPoint, backend.colors[runeColor])
-	} else {
-		backend.sprayRuneMask (
-			mask, destinationRectangle,
-			maskPoint, backend.colors[runeColor])
-	}
-}
-
-func (backend *Backend) sprayRuneMask (
-	mask      image.Image,
-	bounds    image.Rectangle,
-	maskPoint image.Point,
-	fill      xgraphics.BGRA,
-) {
-	maxX := bounds.Max.X - bounds.Min.X
-	maxY := bounds.Max.Y - bounds.Min.Y
-	
-	for y := 0; y < maxY; y ++ {
-	for x := 0; x < maxX; x ++ {
-		_, _, _,
-		alpha := mask.At(x + maskPoint.X, y + maskPoint.Y).RGBA()
-		backend.canvas.SetBGRA (
-			x + bounds.Min.X,
-			y + bounds.Min.Y - backend.metrics.descent,
-			xgraphics.BlendBGRA (
-				backend.colors[stone.ColorBackground],
-				xgraphics.BGRA {
-					R: fill.R,
-					G: fill.G,
-					B: fill.B,
-					A: uint8(alpha >> 8),
-				}))
-	}}
-}
-
-func (backend *Backend) sprayRuneMaskAlpha (
-	mask      *image.Alpha,
-	bounds    image.Rectangle,
-	maskPoint image.Point,
-	fill      xgraphics.BGRA,
-) {
-	maxX := bounds.Max.X - bounds.Min.X
-	maxY := bounds.Max.Y - bounds.Min.Y
-	
-	for y := 0; y < maxY; y ++ {
-	for x := 0; x < maxX; x ++ {
-		alpha := mask.AlphaAt(x + maskPoint.X, y + maskPoint.Y).A
-		backend.canvas.SetBGRA (
-			x + bounds.Min.X,
-			y + bounds.Min.Y - backend.metrics.descent,
-			xgraphics.BlendBGRA (
-				backend.colors[stone.ColorBackground],
-				xgraphics.BGRA {
-					R: fill.R,
-					G: fill.G,
-					B: fill.B,
-					A: alpha,
-				}))
-	}}
+		
+	draw.DrawMask (
+		backend.canvas,
+		destinationRectangle,
+		&image.Uniform {
+			C: backend.config.Color(runeColor),
+		},
+		image.Point { },
+		mask,
+		maskPoint,
+		draw.Over)
 }
 
 func fillRectangle (

backends/x/event.go

@@ -91,9 +91,7 @@ func (backend *Backend) handleButtonPress (
 		backend.compressScrollSum(&sum)
 		backend.callbackManager.RunScroll(sum.x, sum.y)
 	} else {
-		backend.callbackManager.RunPress (
-			stone.Button(buttonEvent.Detail + 127),
-			stone.Modifiers { })
+		backend.callbackManager.RunPress(stone.Button(buttonEvent.Detail + 127))
 	}
 }
 
@@ -112,15 +110,7 @@ func (backend *Backend) handleKeyPress (
 ) {
 	keyEvent := *event.KeyPressEvent
 	button   := backend.keycodeToButton(keyEvent.Detail, keyEvent.State)
-	backend.callbackManager.RunPress (button, stone.Modifiers {
-		// FIXME these may not be correct in all cases
-		Shift:   (keyEvent.State & xproto.ModMaskShift)   > 0,
-		Control: (keyEvent.State & xproto.ModMaskControl) > 0,
-		Alt:     (keyEvent.State & xproto.ModMask1)       > 0,
-		// Meta:    (keyEvent.State & xproto.??)       > 0,
-		Super:   (keyEvent.State & xproto.ModMask4)       > 0,
-		// Hyper:   (keyEvent.State & xproto.??)       > 0,
-	})
+	backend.callbackManager.RunPress(button)
 }
 
 func (backend *Backend) handleKeyRelease (

backends/x/factory.go

@@ -19,8 +19,9 @@ import "github.com/flopp/go-findfont"
 
 // factory instantiates an X backend.
 func factory (
-	application *stone.Application,
+	application     *stone.Application,
 	callbackManager *stone.CallbackManager,
+	imageManager    *stone.ImageManager,
 ) (
 	output stone.Backend,
 	err error,
@@ -29,6 +30,7 @@ func factory (
 		application:     application,
 		config:          application.Config(),
 		callbackManager: callbackManager,
+		imageManager:    imageManager,
 	}
 
 	// load font
@@ -133,7 +135,7 @@ func factory (
 		Connect(backend.connection, backend.window.Id)
 
 	// uncomment these to draw debug bounds
-	// backend.drawCellBounds   = true
+	// backend.drawCellBounds = true
 	// backend.drawBufferBounds = true
 	
 	output = backend

backends/x/unicode.go

@@ -1,6 +1,5 @@
 package x
 
-// import "fmt"
 import "unicode"
 import "github.com/jezek/xgb/xproto"
 import "github.com/jezek/xgbutil/keybind"
@@ -37,15 +36,10 @@ var buttonCodeTable = map[xproto.Keysym] stone.Button {
 	0xFFE2: stone.KeyRightShift,
 	0xFFE3: stone.KeyLeftControl,
 	0xFFE4: stone.KeyRightControl,
-
-	0xFFE7: stone.KeyLeftMeta,
-	0xFFE8: stone.KeyRightMeta,
 	0xFFE9: stone.KeyLeftAlt,
 	0xFFEA: stone.KeyRightAlt,
 	0xFFEB: stone.KeyLeftSuper,
 	0xFFEC: stone.KeyRightSuper,
-	0xFFED: stone.KeyLeftHyper,
-	0xFFEE: stone.KeyRightHyper,
 	
 	0xFFFF: stone.KeyDelete,
 	
@@ -61,14 +55,6 @@ var buttonCodeTable = map[xproto.Keysym] stone.Button {
 	0xFFC7: stone.KeyF10,
 	0xFFC8: stone.KeyF11,
 	0xFFC9: stone.KeyF12,
-
-	// TODO: send this whenever a compose key, dead key, etc is pressed,
-	// and then send the resulting character while witholding the key
-	// presses that were used to compose it. As far as the program is
-	// concerned, a magical key with the final character was pressed and the
-	// KeyDead key is just so that the program might provide some visual
-	// feedback to the user while input is being waited for.
-	0xFF20: stone.KeyDead,
 }
 
 func (backend *Backend) keycodeToButton (
@@ -98,7 +84,7 @@ func (backend *Backend) keycodeToButton (
 		symbol3 = symbol1
 	case symbol3 == 0 && symbol4 == 0:
 		symbol3 = symbol1
-		symbol4 = symbol2
+		symbol2 = symbol2
 	case symbol4 == 0:
 		symbol4 = 0
 	}
@@ -120,8 +106,7 @@ func (backend *Backend) keycodeToButton (
 			symbol2Rune = unicode.ToUpper(symbol1Rune)
 			cased = true
 		} else {
-			symbol2     = symbol1
-			symbol2Rune = symbol1Rune
+			symbol2 = symbol1
 		}
 	}
 	if symbol4 == 0 {
@@ -132,8 +117,7 @@ func (backend *Backend) keycodeToButton (
 			symbol4Rune = unicode.ToUpper(symbol3Rune)
 			cased = true
 		} else {
-			symbol4     = symbol3
-			symbol4Rune = symbol3Rune
+			symbol4 = symbol3
 		}
 	}
 

backends/x/x.go

@@ -17,6 +17,7 @@ type Backend struct {
 	application     *stone.Application
 	config          *stone.Config
 	callbackManager *stone.CallbackManager
+	imageManager    *stone.ImageManager
 	connection      *xgbutil.XUtil
 	window          *xwindow.Window
 	canvas          *xgraphics.Image
@@ -88,6 +89,12 @@ func (backend *Backend) SetIcon (icons []image.Image) (err error) {
 	return
 }
 
+func (backend *Backend) CellMetrics () (width, height int) {
+	width  = backend.metrics.cellWidth
+	height = backend.metrics.cellHeight
+	return
+}
+
 // calculateWindowSize calculates window bounds based on the internal buffer
 // size.
 func (backend *Backend) calculateWindowSize () (x, y int) {

buffer.go

@@ -8,8 +8,8 @@ type Color uint8
 const (
 	ColorBackground  Color = 0x0
 	ColorForeground  Color = 0x1
-	ColorDim         Color = 0x2
-	ColorRed         Color = 0x3
+	ColorRed         Color = 0x2
+	ColorOrange      Color = 0x3
 	ColorYellow      Color = 0x4
 	ColorGreen       Color = 0x5
 	ColorBlue        Color = 0x6

config.go

@@ -55,10 +55,10 @@ func (config *Config) load () {
 		color.RGBA { R: 0, G: 0, B: 0, A: 0 },
 		// foreground
 		color.RGBA { R: 0xFF, G: 0xFF, B: 0xFF, A: 0xFF },
-		// dim
-		color.RGBA { R: 0x80, G: 0x80, B: 0x80, A: 0xFF },
 		// red
 		color.RGBA { R: 0xFF, G: 0x00, B: 0x00, A: 0xFF },
+		// orange
+		color.RGBA { R: 0xFF, G: 0x80, B: 0x00, A: 0xFF },
 		// yellow
 		color.RGBA { R: 0xFF, G: 0xFF, B: 0x00, A: 0xFF },
 		// green
@@ -154,10 +154,10 @@ func (config *Config) loadFile (path string) {
 			config.colors[ColorBackground] = valueColor
 		case "colorForeground":
 			config.colors[ColorForeground] = valueColor
-		case "colorDim":
-			config.colors[ColorDim] = valueColor
 		case "colorRed":
 			config.colors[ColorRed] = valueColor
+		case "colorOrange":
+			config.colors[ColorOrange] = valueColor
 		case "colorYellow":
 			config.colors[ColorYellow] = valueColor
 		case "colorGreen":

event.go

@@ -2,7 +2,7 @@ package stone
 
 type CallbackManager struct {
 	onQuit      func ()
-	onPress     func (button Button, modifiers Modifiers)
+	onPress     func (button Button)
 	onRelease   func (button Button)
 	onResize    func ()
 	onMouseMove func (x, y int)
@@ -15,9 +15,9 @@ func (manager *CallbackManager) RunQuit () {
 	manager.onQuit()
 }
 
-func (manager *CallbackManager) RunPress (button Button, modifiers Modifiers) {
+func (manager *CallbackManager) RunPress (button Button) {
 	if manager.onPress == nil { return }
-	manager.onPress(button, modifiers)
+	manager.onPress(button)
 }
 
 func (manager *CallbackManager) RunRelease (button Button) {

examples/color/main.go

@@ -58,7 +58,7 @@ func redraw () {
 	application.SetRune(0, height - 1, '+')
 
 	for x := 0; x < width; x ++ {
-		application.SetColor(x, height / 2, stone.Color(x % 5 + 3))
+		application.SetColor(x, height / 2, stone.Color(x % 6 + 2))
 	}
 	
 	for x := 1; x < width - 1; x ++ {

examples/draw/main.go

@@ -34,7 +34,7 @@ func main () {
 	if err != nil { panic(err) }
 }
 
-func onPress (button stone.Button, modifiers stone.Modifiers) {
+func onPress (button stone.Button) {
 	if button == stone.MouseButtonLeft {
 		mousePressed = true
 		application.SetRune(0, 0, '+')

examples/printbuttons/main.go

@@ -1,41 +0,0 @@
-package main
-
-import "os"
-import "image"
-import _ "image/png"
-import "git.tebibyte.media/sashakoshka/stone"
-import _ "git.tebibyte.media/sashakoshka/stone/backends/x"
-
-var application = &stone.Application { }
-
-func main () {
-	application.SetTitle("press any key")
-	application.SetSize(8, 1)
-
-	iconFile16, err := os.Open("assets/scaffold16.png")
-	if err != nil { panic(err) }
-	icon16, _, err := image.Decode(iconFile16)
-	if err != nil { panic(err) }
-	iconFile16.Close()
-	iconFile32, err := os.Open("assets/scaffold32.png")
-	if err != nil { panic(err) }
-	icon32, _, err := image.Decode(iconFile32)
-	if err != nil { panic(err) }
-	iconFile16.Close()
-	
-	application.SetIcon([]image.Image { icon16, icon32 })
-	
-	application.OnPress(onPress)
-	application.OnRelease(onRelease)
-	
-	err = application.Run()
-	if err != nil { panic(err) }
-}
-
-func onPress (button stone.Button, modifiers stone.Modifiers) {
-	println("press", button)
-}
-
-func onRelease (button stone.Button) {
-	println("release", button)
-}

examples/type/main.go

@@ -1,20 +1,17 @@
 package main
 
 import "os"
-import "fmt"
 import "image"
 import _ "image/png"
 import "git.tebibyte.media/sashakoshka/stone"
 import _ "git.tebibyte.media/sashakoshka/stone/backends/x"
 
 var application = &stone.Application { }
-var caretX = 0
-var caretY = 2
-var page = 1
+var caret = 0
 
 func main () {
 	application.SetTitle("hellorld")
-	application.SetSize(32, 28)
+	application.SetSize(32, 16)
 
 	iconFile16, err := os.Open("assets/scaffold16.png")
 	if err != nil { panic(err) }
@@ -28,57 +25,32 @@ func main () {
 	iconFile16.Close()
 	
 	application.SetIcon([]image.Image { icon16, icon32 })
-	application.OnStart(redraw)
-	application.OnPress(onPress)
-	application.OnResize(redraw)
 	
-	err = application.Run()
+	channel, err := application.Run()
 	if err != nil { panic(err) }
 	
 	application.Draw()
-}
 
-func redraw () {
-	application.Clear()
-	_, height := application.Size()
-	application.SetDot(0, 0)
-	fmt.Fprint(application, "type some text below:")
-	caretX = 0
-	caretY = 2
-	application.SetDot(0, height - 1)
-	fmt.Fprintf(application, "page %d", page)
-	drawCaret()
-}
+	for {
+		event := <- channel
+		switch event.(type) {
+		case stone.EventQuit:
+			os.Exit(0)
 
-func drawCaret () {
-	application.SetRune(caretX, caretY, '+')
-	application.SetColor(caretX, caretY, stone.ColorDim)
-}
+		case stone.EventPress:
+			button := event.(stone.EventPress).Button
+			if button.Printable() {
+				application.SetRune(caret, 0, rune(button))
+				caret ++
+				width, _ := application.Size()
+				if caret >= width {
+					caret = 0
+				}
+				application.Draw()
+			}
 
-func onPress (button stone.Button, modifiers stone.Modifiers) {
-	width, height := application.Size()
-	
-	if button == stone.KeyEnter {
-		application.SetRune(caretX, caretY, 0)
-		caretX = 0
-		caretY ++
-			
-	} else if button.Printable() {
-		application.SetRune(caretX, caretY, rune(button))
-		application.SetColor(caretX, caretY, stone.ColorForeground)
-		caretX ++
-		
-		if caretX >= width {
-			caretX = 0
-			caretY ++
+		case stone.EventResize:
+			application.Draw()
 		}
 	}
-
-	if caretY >= height - 2 {
-		page ++
-		redraw()
-	}
-		
-	drawCaret()
-	application.Draw()
 }

image.go

@@ -0,0 +1,142 @@
+package stone
+
+import "sync"
+import "image"
+import "image/color"
+
+type ImageManager struct {
+	lock sync.RWMutex
+	images []*ColorImage
+}
+
+func (manager *ImageManager) For (callback func (im *ColorImage)) {
+	manager.lock.RLock()
+	defer manager.lock.RUnlock()
+
+	for _, im := range manager.images {
+		callback(im)
+	}
+}
+
+func (manager *ImageManager) Add (im *ColorImage) {
+	manager.lock.Lock()
+	defer manager.lock.Unlock()
+	
+	manager.images = append(manager.images, im)
+}
+
+func (manager *ImageManager) Size () (size int) {
+	manager.lock.RLock()
+	defer manager.lock.RUnlock()
+	
+	size = len(manager.images)
+	return
+}
+
+func (manager *ImageManager) At (index int) (im *ColorImage) {
+	manager.lock.RLock()
+	defer manager.lock.RUnlock()
+	
+	if index < 0 || index > len(manager.images) { return }
+	im = manager.images[index]
+	return
+}
+
+func (manager *ImageManager) Remove (im *ColorImage) (removed bool) {
+	manager.lock.Lock()
+	defer manager.lock.Unlock()
+
+	index := 0
+	for manager.images[index] != im && index < len(manager.images) {
+		index ++
+	}
+
+	if index >= len(manager.images) { return }
+	
+	manager.images = append (
+		manager.images[:index],
+		manager.images[index + 1:]...)
+	removed = true
+	return
+}
+
+type ColorImage struct {
+	x,           y            int
+	width,       height       int
+	bufferWidth, bufferHeight int
+	cellWidth,   cellHeight   int
+	buffer []color.RGBA
+
+	clean bool
+}
+
+func (im *ColorImage) Model () (model color.Model) {
+	model = color.RGBAModel
+	return
+}
+
+func (im *ColorImage) Bounds () (bounds image.Rectangle) {
+	bounds.Max.X = im.width
+	bounds.Max.Y = im.height
+	return
+}
+
+func (im *ColorImage) Size () (width, height int) {
+	width  = im.width
+	height = im.height
+	return
+}
+
+func (im *ColorImage) SetSize (width, height int) {
+	im.width  = width
+	im.height = height
+	im.bufferWidth  = im.cellWidth  * im.width
+	im.bufferHeight = im.cellHeight * im.height
+	im.buffer = make([]color.RGBA, im.bufferWidth * im.bufferHeight)
+	im.clean = false
+}
+
+func (im *ColorImage) At (x, y int) (pixel color.Color) {
+	if im.outOfBounds(x, y) { return }
+	pixel = im.buffer[x + y * im.width]
+	return
+}
+
+func (im *ColorImage) AtRGBA (x, y int) (pixel color.RGBA) {
+	if im.outOfBounds(x, y) { return }
+	pixel = im.buffer[x + y * im.width]
+	return
+}
+
+func (im *ColorImage) Set (x, y int, pixel color.Color) {
+	if im.outOfBounds(x, y) { return }
+	r, g, b, a := pixel.RGBA()
+	im.buffer[x + y * im.width] = color.RGBA {
+		R: uint8(r >> 8),
+		G: uint8(g >> 8),
+		B: uint8(b >> 8),
+		A: uint8(a >> 8),
+	}
+
+	im.clean = false
+	return
+}
+
+func (im *ColorImage) SetRGBA (x, y int, pixel color.RGBA) {
+	if im.outOfBounds(x, y) { return }
+	im.buffer[x + y * im.width] = pixel
+	return
+}
+
+func (im *ColorImage) MarkClean () {
+	im.clean = true
+}
+
+func (im *ColorImage) outOfBounds (x, y int) (outOfBounds bool) {
+	outOfBounds =
+		x >= im.width  ||
+		y >= im.height ||
+		x < 0 ||
+		y < 0
+	return
+}

input.go

@@ -34,13 +34,9 @@ const (
 	KeyLeftControl  Button = 22
 	KeyRightControl Button = 23
 	KeyLeftAlt      Button = 24
-	KeyRightAlt     Button = 25
-	KeyLeftMeta     Button = 26
-	KeyRightMeta    Button = 27	
-	KeyLeftSuper    Button = 28
-	KeyRightSuper   Button = 29
-	KeyLeftHyper    Button = 30
-	KeyRightHyper   Button = 31
+	KeyRightAlt     Button = 25	
+	KeyLeftSuper    Button = 26
+	KeyRightSuper   Button = 27
 	
 	KeyDelete       Button = 127
 	
@@ -71,8 +67,6 @@ const (
 	KeyF10 Button = 153
 	KeyF11 Button = 154
 	KeyF12 Button = 155
-	
-	KeyDead Button = 156
 )
 
 // Printable returns whether or not the character could show up on screen. If
@@ -82,16 +76,3 @@ func (button Button) Printable () (printable bool) {
 	printable = unicode.IsPrint(rune(button))
 	return
 }
-
-// Modifiers lists what modifier keys are being pressed. This is used in
-// conjunction with a button code in a button press event. These should be used
-// instead of attempting to track the state of the modifier keys, because there
-// is no guarantee that one press event will be coupled with one release event.
-type Modifiers struct {
-	Shift   bool
-	Control bool
-	Alt     bool
-	Meta    bool
-	Super   bool
-	Hyper   bool
-}