image

package

v3.0.5 Latest Latest Go to latest Published: Apr 16, 2023 License: Apache-2.0 Imports: 5 Imported by: 0

Details

Valid go.mod file

The Go module system was introduced in Go 1.11 and is the official dependency management solution for Go.
Redistributable license

Redistributable licenses place minimal restrictions on how software can be used, modified, and redistributed.
Tagged version

Modules with tagged versions give importers more predictable builds.
Stable version

When a project reaches major version v1 it is considered stable.
Learn more about best practices

Repository

github.com/giongto35/cloud-game

Links

Open Source Insights

Documentation ¶

Overview ¶

Package image contains functions for rotations of points in a 2-dimensional space.

Index ¶

Constants
Variables
func ExampleRotate(data []uint8, w int, h int, angle Angle) []uint8
func Invert180(x, y, _, h int) (int, int)
func Resize(scaleType int, src *image.RGBA, out *image.RGBA)
func Rotate0(x, y, _, _ int) (int, int)
func Rotate180(x, y, w, h int) (int, int)
func Rotate270(x, y, _, h int) (int, int)
func Rotate90(x, y, w, _ int) (int, int)
type Angle
type Canvas
- func NewCanvas(w, h, size int) *Canvas
type Frame
- func (f *Frame) Copy() Frame
- func (f *Frame) Opaque() bool
type Rotate
- func GetRotation(angle Angle) Rotate

Constants ¶

View Source

const (
	BitFormatShort5551  = iota // BIT_FORMAT_SHORT_5_5_5_1 has 5 bits R, 5 bits G, 5 bits B, 1 bit alpha
	BitFormatInt8888Rev        // BIT_FORMAT_INT_8_8_8_8_REV has 8 bits R, 8 bits G, 8 bits B, 8 bit alpha
	BitFormatShort565          // BIT_FORMAT_SHORT_5_6_5 has 5 bits R, 6 bits G, 5 bits
)

View Source

const (
	ScaleNot              = iota // skips image interpolation
	ScaleNearestNeighbour        // nearest neighbour interpolation
	ScaleBilinear                // bilinear interpolation
)

Variables ¶

View Source

var Angles = [5]Rotate{
	Angle0:   {Angle: Angle0, Call: Rotate0},
	Angle90:  {Angle: Angle90, Call: Rotate90, IsEven: true},
	Angle180: {Angle: Angle180, Call: Rotate180},
	Angle270: {Angle: Angle270, Call: Rotate270, IsEven: true},
	Flip180:  {Angle: Flip180, Call: Invert180},
}

Angles is a helper to choose appropriate rotation based on its angle.

Functions ¶

func ExampleRotate ¶

func ExampleRotate(data []uint8, w int, h int, angle Angle) []uint8

ExampleRotate is an example of rotation usage.

[1 2 3 4 5 6 7 8 9]
[7 4 1 8 5 2 9 6 3]

func Invert180 ¶

func Invert180(x, y, _, h int) (int, int)

func Resize ¶

func Resize(scaleType int, src *image.RGBA, out *image.RGBA)

func Rotate0 ¶

func Rotate0(x, y, _, _ int) (int, int)

Rotate0 is 0° or the original orientation.

1 2 3    1 2 3
4 5 6 -> 4 5 6
7 8 9    7 8 9

func Rotate180 ¶

func Rotate180(x, y, w, h int) (int, int)

Rotate180 is 180° CCW.

1 2 3    9 8 7
4 5 6 -> 6 5 4
7 8 9    3 2 1

func Rotate270 ¶

func Rotate270(x, y, _, h int) (int, int)

Rotate270 is 270° CCW or 90° CW.

1 2 3    7 4 1
4 5 6 -> 8 5 2
7 8 9    9 6 3

func Rotate90 ¶

func Rotate90(x, y, w, _ int) (int, int)

Rotate90 is 90° CCW or 270° CW.

1 2 3    3 6 9
4 5 6 -> 2 5 8
7 8 9    1 4 7

Types ¶

type Angle ¶

type Angle uint

const (
	Angle0 Angle = iota
	Angle90
	Angle180
	Angle270
	Flip180
)

type Canvas ¶

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

Canvas is a stateful drawing surface, i.e. image.RGBA

func NewCanvas ¶

func NewCanvas(w, h, size int) *Canvas

func (*Canvas) Clear ¶

func (c *Canvas) Clear()

func (*Canvas) Draw ¶

func (c *Canvas) Draw(encoding uint32, rot *Rotate, w, h, packedW, bpp int, data []byte, th int) *Frame

func (*Canvas) Get ¶

func (c *Canvas) Get(w, h int) *Frame

func (*Canvas) Put ¶

func (c *Canvas) Put(i *Frame)

type Frame ¶

type Frame struct {
	*image.RGBA
}

func (*Frame) Copy ¶

func (f *Frame) Copy() Frame

func (*Frame) Opaque ¶

func (f *Frame) Opaque() bool

type Rotate ¶

type Rotate struct {
	Angle  Angle
	Call   func(x, y, w, h int) (int, int)
	IsEven bool
}

Rotate is an interface for rotation of a given point.

With the coordinates x, y in the matrix of w x h. Returns a pair of new coordinates x, y in the resulting matrix. Be aware that w / h values are 0 index-based, and it's meant to be used with h corresponded to matrix height and y coordinate, and with w to x coordinate.

func GetRotation ¶

func GetRotation(angle Angle) Rotate

Source Files ¶

View all Source files

?	: This menu
/	: Search site
f or F	: Jump to
y or Y	: Canonical URL