xcanvas

Documentation

Index

• type Canvas
  • func NewCanvas(x *xgbutil.XUtil, bounds image.Rectangle) *Canvas
  • func NewCanvasFrom(image *xgraphics.Image) *Canvas
  • func (this *Canvas) Close() error
  • func (this *Canvas) Pen() canvas.Pen
  • func (this *Canvas) Push(window xproto.Window)
  • func (this *Canvas) SubCanvas(bounds image.Rectangle) canvas.Canvas
• type Texture
  • func AssertTexture(unknown canvas.Texture) *Texture
  • func NewTextureFrom(source image.Image) *Texture
  • func (this *Texture) At(x, y int) color.Color
  • func (this *Texture) BGRAAt(x, y int) xgraphics.BGRA
  • func (this *Texture) Bounds() image.Rectangle
  • func (this *Texture) Close() error
  • func (this *Texture) ColorModel() color.Model
  • func (this *Texture) Opaque() bool
  • func (this *Texture) PixOffset(x, y int) int
  • func (this *Texture) SubTexture(bounds image.Rectangle) canvas.Texture

Types

type Canvas

type Canvas struct {
	*xgraphics.Image
}

Canvas satisfies the canvas.Canvas interface. It draws to an xgraphics.Image. It must be closed after use.

func NewCanvas

func NewCanvas(x *xgbutil.XUtil, bounds image.Rectangle) *Canvas

NewCanvas creates a new canvas from a bounding rectangle.

func NewCanvasFrom

func NewCanvasFrom(image *xgraphics.Image) *Canvas

NewCanvasFrom creates a new canvas from an existing xgraphics.Image. Note that calling Close() on the resulting canvas will destroy this image.

func (*Canvas) Close

func (this *Canvas) Close() error

Close frees this canvas from the X server.

func (*Canvas) Pen

func (this *Canvas) Pen() canvas.Pen

Pen returns a new drawing context.

func (*Canvas) Push

func (this *Canvas) Push(window xproto.Window)

Push pushes this canvas to the screen.

func (*Canvas) SubCanvas

func (this *Canvas) SubCanvas(bounds image.Rectangle) canvas.Canvas

SubCanvas returns a subset of this canvas that points to the same data.

type Texture

type Texture struct {
	// contains filtered or unexported fields
}

Texture is a read-only image texture that can be quickly written to a canvas. It must be closed manually after use.

func AssertTexture

func AssertTexture(unknown canvas.Texture) *Texture

AssertTexture checks if a given canvas.Texture is a texture from this package.

func NewTextureFrom

func NewTextureFrom(source image.Image) *Texture

NewTextureFrom creates a new texture from a source image.

func (*Texture) At

func (this *Texture) At(x, y int) color.Color

func (*Texture) BGRAAt

func (this *Texture) BGRAAt(x, y int) xgraphics.BGRA

func (*Texture) Bounds

func (this *Texture) Bounds() image.Rectangle

Bounds returns the bounding rectangle of this texture.

func (*Texture) Close

func (this *Texture) Close() error

Close frees the texture from memory.

func (*Texture) ColorModel

func (this *Texture) ColorModel() color.Model

func (*Texture) Opaque

func (this *Texture) Opaque() bool

Opaque reports whether or not the texture is fully opaque.

func (*Texture) PixOffset

func (this *Texture) PixOffset(x, y int) int

func (*Texture) SubTexture

func (this *Texture) SubTexture(bounds image.Rectangle) canvas.Texture

SubTexture returns a subset of this texture that points to the same data.