raster

package

v0.10.0 Latest Latest Go to latest Published: Dec 23, 2025 License: MIT Imports: 1 Imported by: 0

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Valid go.mod file
Redistributable license
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Repository

github.com/gogpu/gg

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Documentation ¶

Overview ¶

Package raster provides scanline rasterization for 2D paths.

Index ¶

type ActiveEdge
type ActiveEdgeTable
- func NewActiveEdgeTable() *ActiveEdgeTable
type Edge
- func NewEdge(p0, p1 Point) Edge
- func (e *Edge) XAtY(y float64) float64
type FillRule
type Pixmap
type Point
type RGBA
type Rasterizer
- func NewRasterizer(width, height int) *Rasterizer
- func (r *Rasterizer) Fill(pixmap Pixmap, points []Point, fillRule FillRule, color RGBA)
- func (r *Rasterizer) Stroke(pixmap Pixmap, points []Point, lineWidth float64, color RGBA)
type SpanFiller

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type ActiveEdge ¶

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

ActiveEdge is an edge being processed by the rasterizer.

type ActiveEdgeTable ¶

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

ActiveEdgeTable represents edges active at a scanline.

func NewActiveEdgeTable ¶

func NewActiveEdgeTable() *ActiveEdgeTable

NewActiveEdgeTable creates a new active edge table.

func (*ActiveEdgeTable) Add ¶

func (aet *ActiveEdgeTable) Add(edge Edge)

Add adds an edge to the active edge table.

func (*ActiveEdgeTable) Clear ¶

func (aet *ActiveEdgeTable) Clear()

Clear clears all edges.

func (*ActiveEdgeTable) Edges ¶

func (aet *ActiveEdgeTable) Edges() []ActiveEdge

Edges returns the active edges.

func (*ActiveEdgeTable) Remove ¶

func (aet *ActiveEdgeTable) Remove(y float64)

Remove removes inactive edges for the given scanline.

func (*ActiveEdgeTable) Sort ¶

func (aet *ActiveEdgeTable) Sort()

Sort sorts edges by x coordinate (insertion sort for small lists).

func (*ActiveEdgeTable) Update ¶

func (aet *ActiveEdgeTable) Update()

Update updates x positions for the next scanline.

type Edge ¶

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

Edge represents a line segment for scanline rasterization.

func NewEdge ¶

func NewEdge(p0, p1 Point) Edge

NewEdge creates a new edge from two points.

func (*Edge) XAtY ¶

func (e *Edge) XAtY(y float64) float64

XAtY calculates the x coordinate at the given y coordinate.

type FillRule ¶

type FillRule int

FillRule specifies how to determine which areas are inside a path.

const (
	// FillRuleNonZero uses the non-zero winding rule.
	FillRuleNonZero FillRule = iota
	// FillRuleEvenOdd uses the even-odd rule.
	FillRuleEvenOdd
)

type Pixmap ¶

type Pixmap interface {
	Width() int
	Height() int
	SetPixel(x, y int, c RGBA)
}

Pixmap is an interface for writing pixels (avoids import cycle).

type Point ¶

type Point struct {
	X, Y float64
}

Point represents a 2D point (internal copy to avoid import cycle).

type RGBA ¶

type RGBA struct {
	R, G, B, A float64
}

RGBA represents a color (internal copy to avoid import cycle).

type Rasterizer ¶

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

Rasterizer performs scanline rasterization.

func NewRasterizer ¶

func NewRasterizer(width, height int) *Rasterizer

NewRasterizer creates a new rasterizer for the given dimensions.

func (*Rasterizer) Fill ¶

func (r *Rasterizer) Fill(pixmap Pixmap, points []Point, fillRule FillRule, color RGBA)

Fill rasterizes a filled path onto a pixmap.

func (*Rasterizer) Stroke ¶

func (r *Rasterizer) Stroke(pixmap Pixmap, points []Point, lineWidth float64, color RGBA)

Stroke rasterizes a stroked path.

type SpanFiller ¶ added in v0.5.0

type SpanFiller interface {
	FillSpan(x1, x2, y int, c RGBA)
}

SpanFiller is an optional interface that pixmaps can implement for optimized span filling.

Source Files ¶

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