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image.go
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image.go
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package bimg
// Image provides a simple method DSL to transform a given image as byte buffer.
type Image struct {
buffer []byte
}
// NewImage creates a new Image struct with method DSL.
func NewImage(buf []byte) *Image {
return &Image{buf}
}
// Resize resizes the image to fixed width and height.
func (i *Image) Resize(width, height int) ([]byte, error) {
options := Options{
Width: width,
Height: height,
Embed: true,
}
return i.Process(options)
}
// ForceResize resizes with custom size (aspect ratio won't be maintained).
func (i *Image) ForceResize(width, height int) ([]byte, error) {
options := Options{
Width: width,
Height: height,
Force: true,
}
return i.Process(options)
}
// ResizeAndCrop resizes the image to fixed width and height with additional crop transformation.
func (i *Image) ResizeAndCrop(width, height int) ([]byte, error) {
options := Options{
Width: width,
Height: height,
Embed: true,
Crop: true,
}
return i.Process(options)
}
// SmartCrop produces a thumbnail aiming at focus on the interesting part.
func (i *Image) SmartCrop(width, height int) ([]byte, error) {
options := Options{
Width: width,
Height: height,
Crop: true,
Gravity: GravitySmart,
}
return i.Process(options)
}
// Extract area from the by X/Y axis in the current image.
func (i *Image) Extract(top, left, width, height int) ([]byte, error) {
options := Options{
Top: top,
Left: left,
AreaWidth: width,
AreaHeight: height,
}
if top == 0 && left == 0 {
options.Top = -1
}
return i.Process(options)
}
// Enlarge enlarges the image by width and height. Aspect ratio is maintained.
func (i *Image) Enlarge(width, height int) ([]byte, error) {
options := Options{
Width: width,
Height: height,
Enlarge: true,
}
return i.Process(options)
}
// EnlargeAndCrop enlarges the image by width and height with additional crop transformation.
func (i *Image) EnlargeAndCrop(width, height int) ([]byte, error) {
options := Options{
Width: width,
Height: height,
Enlarge: true,
Crop: true,
}
return i.Process(options)
}
// Crop crops the image to the exact size specified.
func (i *Image) Crop(width, height int, gravity Gravity) ([]byte, error) {
options := Options{
Width: width,
Height: height,
Gravity: gravity,
Crop: true,
}
return i.Process(options)
}
// CropByWidth crops an image by width only param (auto height).
func (i *Image) CropByWidth(width int) ([]byte, error) {
options := Options{
Width: width,
Crop: true,
}
return i.Process(options)
}
// CropByHeight crops an image by height (auto width).
func (i *Image) CropByHeight(height int) ([]byte, error) {
options := Options{
Height: height,
Crop: true,
}
return i.Process(options)
}
// Thumbnail creates a thumbnail of the image by the a given width by aspect ratio 4:4.
func (i *Image) Thumbnail(pixels int) ([]byte, error) {
options := Options{
Width: pixels,
Height: pixels,
Crop: true,
Quality: 95,
}
return i.Process(options)
}
// Watermark adds text as watermark on the given image.
func (i *Image) Watermark(w Watermark) ([]byte, error) {
options := Options{Watermark: w}
return i.Process(options)
}
// WatermarkImage adds image as watermark on the given image.
func (i *Image) WatermarkImage(w WatermarkImage) ([]byte, error) {
options := Options{WatermarkImage: w}
return i.Process(options)
}
// Zoom zooms the image by the given factor.
// You should probably call Extract() before.
func (i *Image) Zoom(factor int) ([]byte, error) {
options := Options{Zoom: factor}
return i.Process(options)
}
// Rotate rotates the image by given angle degrees (0, 90, 180 or 270).
func (i *Image) Rotate(a Angle) ([]byte, error) {
options := Options{Rotate: a}
return i.Process(options)
}
// Flip flips the image about the vertical Y axis.
func (i *Image) Flip() ([]byte, error) {
options := Options{Flip: true}
return i.Process(options)
}
// Flop flops the image about the horizontal X axis.
func (i *Image) Flop() ([]byte, error) {
options := Options{Flop: true}
return i.Process(options)
}
// Convert converts image to another format.
func (i *Image) Convert(t ImageType) ([]byte, error) {
options := Options{Type: t}
return i.Process(options)
}
// Colourspace performs a color space conversion bsaed on the given interpretation.
func (i *Image) Colourspace(c Interpretation) ([]byte, error) {
options := Options{Interpretation: c}
return i.Process(options)
}
// Trim removes the background from the picture. It can result in a 0x0 output
// if the image is all background.
func (i *Image) Trim() ([]byte, error) {
options := Options{Trim: true}
return i.Process(options)
}
// Process processes the image based on the given transformation options,
// talking with libvips bindings accordingly and returning the resultant
// image buffer.
func (i *Image) Process(o Options) ([]byte, error) {
image, err := Resize(i.buffer, o)
if err != nil {
return nil, err
}
i.buffer = image
return image, nil
}
// Metadata returns the image metadata (size, alpha channel, profile, EXIF rotation).
func (i *Image) Metadata() (ImageMetadata, error) {
return Metadata(i.buffer)
}
// Interpretation gets the image interpretation type.
// See: https://www.vips.ecs.soton.ac.uk/supported/current/doc/html/libvips/VipsImage.html#VipsInterpretation
func (i *Image) Interpretation() (Interpretation, error) {
return ImageInterpretation(i.buffer)
}
// ColourspaceIsSupported checks if the current image
// color space is supported.
func (i *Image) ColourspaceIsSupported() (bool, error) {
return ColourspaceIsSupported(i.buffer)
}
// Type returns the image type format (jpeg, png, webp, tiff).
func (i *Image) Type() string {
return DetermineImageTypeName(i.buffer)
}
// Size returns the image size as form of width and height pixels.
func (i *Image) Size() (ImageSize, error) {
return Size(i.buffer)
}
// Image returns the current resultant image buffer.
func (i *Image) Image() []byte {
return i.buffer
}
// Length returns the size in bytes of the image buffer.
func (i *Image) Length() int {
return len(i.buffer)
}