-- import "github.com/MJKWoolnough/limage"
Package limage introduces structures to read and build layered images
type Composite uint32
Composite determines how two layers are composed together
const (
CompositeNormal Composite = 0
CompositeDissolve Composite = 1
CompositeBehind Composite = 2
CompositeMultiply Composite = 3
CompositeScreen Composite = 4
CompositeOverlay Composite = 5
CompositeDifference Composite = 6
CompositeAddition Composite = 7
CompositeSubtract Composite = 8
CompositeDarkenOnly Composite = 9
CompositeLightenOnly Composite = 10
CompositeHue Composite = 11
CompositeSaturation Composite = 12
CompositeColor Composite = 13
CompositeValue Composite = 14
CompositeDivide Composite = 15
CompositeDodge Composite = 16
CompositeBurn Composite = 17
CompositeHardLight Composite = 18
CompositeSoftLight Composite = 19
CompositeGrainExtract Composite = 20
CompositeGrainMerge Composite = 21
CompositeLuminosity Composite = 22
CompositePlus Composite = 23
CompositeDestinationIn Composite = 24
CompositeDestinationOut Composite = 25
CompositeSourceAtop Composite = 26
CompositeDestinationAtop Composite = 27
)
Composite constants
func (c Composite) Composite(b, t color.Color) color.Color
Composite performs the composition of two layers
func (c Composite) String() string
String returns the name of the composition
type GrayAlpha struct {
Pix []lcolor.GrayAlpha
Stride int
Rect image.Rectangle
}
GrayAlpha is an image of GrayAlpha pixels
func NewGrayAlpha(r image.Rectangle) *GrayAlpha
NewGrayAlpha create a new GrayAlpha image with the given bounds
func (g *GrayAlpha) At(x, y int) color.Color
At returns the color for the pixel at the specified coords
func (g *GrayAlpha) Bounds() image.Rectangle
Bounds returns the limits of the image
func (g *GrayAlpha) ColorModel() color.Model
ColorModel returns a color model to transform arbitrary colours into a GrayAlpha color
func (g *GrayAlpha) GrayAlphaAt(x, y int) lcolor.GrayAlpha
GrayAlphaAt returns a GrayAlpha colr for the specified coords
func (g *GrayAlpha) Opaque() bool
Opaque returns true if all pixels have full alpha
func (g *GrayAlpha) PixOffset(x, y int) int
PixOffset returns the index of the element of Pix corresponding to the given coords
func (g *GrayAlpha) Set(x, y int, c color.Color)
Set converts the given colour to a GrayAlpha colour and sets it at the given coords
func (g *GrayAlpha) SetGrayAlpha(x, y int, ga lcolor.GrayAlpha)
SetGrayAlpha sets the colour at the given coords
func (g *GrayAlpha) SubImage(r image.Rectangle) image.Image
SubImage retuns the Image viewable through the given bounds
type Image []Layer
Image represents a collection of layers
func (g Image) At(x, y int) color.Color
At returns the colour at the specified coords
func (g Image) Bounds() image.Rectangle
Bounds returns the limits for the dimensions of the group
func (g Image) ColorModel() color.Model
ColorModel represents the color model of the group. It uses the first layer to determine the color model
func (g Image) SubImage(r image.Rectangle) image.Image
SubImage returns an image representing the portion of the image p visible through r. The returned value shares pixels with the original image
type Layer struct {
Name string
LayerBounds image.Rectangle // Bounds within the layer group
Mode Composite
Invisible bool
Transparency uint8
image.Image
}
Layer represents a single layer of a multilayered image
func (l Layer) At(x, y int) color.Color
At returns the colour at the specified coords
func (l Layer) Bounds() image.Rectangle
Bounds returns the limits for the dimensions of the layer
func (l Layer) SubImage(r image.Rectangle) image.Image
SubImage returns an image representing the portion of the image p visible through r. The returned value shares pixels with the original image
type MaskedImage struct {
image.Image
Mask *image.Gray
}
MaskedImage represents an image that has a to-be-applied mask
func (m MaskedImage) At(x, y int) color.Color
At returns the colour at the specified coords after masking
type PalettedAlpha struct {
Pix []lcolor.IndexedAlpha
Stride int
Rect image.Rectangle
Palette lcolor.AlphaPalette
}
PalettedAlpha represents a paletted image with an alpha channel
func NewPalettedAlpha(r image.Rectangle, p lcolor.AlphaPalette) *PalettedAlpha
NewPalettedAlpha creates a new image that uses a palette with an alpha channel
func (p *PalettedAlpha) At(x, y int) color.Color
At returns the color of the pixel at the given coords
func (p *PalettedAlpha) Bounds() image.Rectangle
Bounds returns the limits of the image
func (p *PalettedAlpha) ColorModel() color.Model
ColorModel a color model to tranform arbitrary colors to one in the palette
func (p *PalettedAlpha) IndexAlphaAt(x, y int) lcolor.IndexedAlpha
IndexAlphaAt returns the palette index and Alpha component of the given coords
func (p *PalettedAlpha) Opaque() bool
Opaque returns true if the image is completely opaque
func (p *PalettedAlpha) PixOffset(x, y int) int
PixOffset returns the index of the Pix array corresponding to the given coords
func (p *PalettedAlpha) Set(x, y int, c color.Color)
Set converts the given colour to the closest in the palette and sets it at the given coords
func (p *PalettedAlpha) SetIndexAlpha(x, y int, ia lcolor.IndexedAlpha)
SetIndexAlpha directly set the index and alpha channels to the given coords
func (p *PalettedAlpha) SubImage(r image.Rectangle) image.Image
SubImage retuns the Image viewable through the given bounds
type RGB struct {
Pix []lcolor.RGB
Stride int
Rect image.Rectangle
}
RGB is an image of RGB colours
func NewRGB(r image.Rectangle) *RGB
NewRGB create a new RGB image with the given bounds
func (r *RGB) At(x, y int) color.Color
At returns the colour at the given coords
func (r *RGB) Bounds() image.Rectangle
Bounds returns the limits of the image
func (r *RGB) ColorModel() color.Model
ColorModel returns a colour model that converts arbitrary colours to the RGB space
func (r *RGB) Opaque() bool
Opaque just returns true as the alpha channel is fixed.
func (r *RGB) PixOffset(x, y int) int
PixOffset returns the index of the Pix array correspinding to the given coords
func (r *RGB) RGBAt(x, y int) lcolor.RGB
RGBAt returns the exact RGB colour at the given coords
func (r *RGB) Set(x, y int, c color.Color)
Set converts the given colour to the RGB space and sets it at the given coords
func (r *RGB) SetRGB(x, y int, rgb lcolor.RGB)
SetRGB directly set an RGB colour to the given coords
func (r *RGB) SubImage(rt image.Rectangle) image.Image
SubImage retuns the Image viewable through the given bounds
type Text struct {
image.Image
TextData
}
Text represents a text layer
type TextData []TextDatum
TextData represents the stylised text
func (t TextData) String() string
String returns a flattened string
type TextDatum struct {
ForeColor, BackColor color.Color
Size, LetterSpacing, Rise uint32
Bold, Italic, Underline, Strikethrough bool
Font, Data string
}
TextDatum is a collection of styling for a single piece of text
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