graphicsutil

Documentation

Index

• func CopyImage(img image.Image) []byte
• func MipmapLevel(det float32) int
• func QuadIndices() []uint16
• func QuadVertices(width, height int, sx0, sy0, sx1, sy1 int, a, b, c, d, tx, ty float32, ...) []float32
• func Vertex(width, height int, dx, dy, sx, sy float32, cr, cg, cb, ca float32) []float32

Functions

func CopyImage

func CopyImage(img image.Image) []byte

CopyImage copies img to a new RGBA image.

Basically CopyImage just calls draw.Draw. If img is a paletted image, an optimized copying method is used.

CopyImage is used only internally but it is exposed for testing.

func MipmapLevel

func MipmapLevel(det float32) int

MipmapLevel returns an appropriate mipmap level for the given determinant of a geometry matrix.

MipmapLevel returns -1 if det is 0.

MipmapLevel panics if det is NaN.

func QuadIndices

func QuadIndices() []uint16

func QuadVertices

func QuadVertices(width, height int, sx0, sy0, sx1, sy1 int, a, b, c, d, tx, ty float32, cr, cg, cb, ca float32) []float32

func Vertex

func Vertex(width, height int, dx, dy, sx, sy float32, cr, cg, cb, ca float32) []float32