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processor.go
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processor.go
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package caire
import (
_ "embed"
"errors"
"fmt"
"image"
"image/color"
"image/color/palette"
"image/draw"
"image/gif"
"image/jpeg"
"image/png"
"io"
"math"
"os"
"path/filepath"
"strings"
"github.com/disintegration/imaging"
"github.com/esimov/caire/utils"
pigo "github.com/esimov/pigo/core"
"golang.org/x/image/bmp"
)
//go:embed data/facefinder
var cascadeFile []byte
var (
g *gif.GIF
rCount int
)
var (
resizeXY = false // the image is resized both vertically and horizontally
isGif = false
imgWorker = make(chan worker) // channel used to transfer the image to the GUI
errs = make(chan error)
)
// worker struct contains all the information needed for transferring the resized image to the Gio GUI.
type worker struct {
carver *Carver
img *image.NRGBA
debug *image.NRGBA
done bool
}
// SeamCarver interface defines the Resize method.
// This needs to be implemented by every struct which declares a Resize method.
type SeamCarver interface {
Resize(*image.NRGBA) (image.Image, error)
}
// shrinkFn is a generic function used to shrink an image.
type shrinkFn func(*Carver, *image.NRGBA) (*image.NRGBA, error)
// enlargeFn is a generic function used to enlarge an image.
type enlargeFn func(*Carver, *image.NRGBA) (*image.NRGBA, error)
// Processor options
type Processor struct {
SobelThreshold int
BlurRadius int
NewWidth int
NewHeight int
Percentage bool
Square bool
Debug bool
Preview bool
FaceDetect bool
ShapeType string
SeamColor string
MaskPath string
RMaskPath string
Mask *image.NRGBA
RMask *image.NRGBA
GuiDebug *image.NRGBA
FaceAngle float64
FaceDetector *pigo.Pigo
Spinner *utils.Spinner
vRes bool
}
var (
shrinkHorizFn shrinkFn
shrinkVertFn shrinkFn
enlargeHorizFn enlargeFn
enlargeVertFn enlargeFn
)
// resize implements the Resize method of the Carver interface.
// It returns the concrete resize operation method.
func resize(s SeamCarver, img *image.NRGBA) (image.Image, error) {
return s.Resize(img)
}
// Resize is the main entry point for the image resize operation.
// The new image can be resized either horizontally or vertically (or both).
// Depending on the provided options the image can be either reduced or enlarged.
func (p *Processor) Resize(img *image.NRGBA) (image.Image, error) {
var c = NewCarver(img.Bounds().Dx(), img.Bounds().Dy())
var (
newImg image.Image
newWidth int
newHeight int
pw, ph int
err error
)
rCount = 0
if p.NewWidth > c.Width {
newWidth = p.NewWidth - (p.NewWidth - (p.NewWidth - c.Width))
} else {
newWidth = c.Width - (c.Width - (c.Width - p.NewWidth))
}
if p.NewHeight > c.Height {
newHeight = p.NewHeight - (p.NewHeight - (p.NewHeight - c.Height))
} else {
newHeight = c.Height - (c.Height - (c.Height - p.NewHeight))
}
if p.NewWidth == 0 {
newWidth = p.NewWidth
}
if p.NewHeight == 0 {
newHeight = p.NewHeight
}
// shrinkHorizFn calls itself recursively to shrink the image horizontally.
// If the image is resized on both X and Y axis it calls the shrink and enlarge
// function intermittently up until the desired dimension is reached.
// We are opting for this solution instead of resizing the image sequentially,
// because this way the horizontal and vertical seams are merged together seamlessly.
shrinkHorizFn = func(c *Carver, img *image.NRGBA) (*image.NRGBA, error) {
p.vRes = false
dx, dy := img.Bounds().Dx(), img.Bounds().Dy()
if dx > p.NewWidth {
img, err = p.shrink(c, img)
if err != nil {
return nil, err
}
if p.NewHeight > 0 && p.NewHeight != dy {
if p.NewHeight <= dy {
img, err = shrinkVertFn(c, img)
if err != nil {
return nil, err
}
} else {
img, err = enlargeVertFn(c, img)
if err != nil {
return nil, err
}
}
} else {
img, err = shrinkHorizFn(c, img)
if err != nil {
return nil, err
}
}
}
rCount++
return img, nil
}
// enlargeHorizFn calls itself recursively to enlarge the image horizontally.
enlargeHorizFn = func(c *Carver, img *image.NRGBA) (*image.NRGBA, error) {
p.vRes = false
dx, dy := img.Bounds().Dx(), img.Bounds().Dy()
if dx < p.NewWidth {
img, err = p.enlarge(c, img)
if err != nil {
return nil, err
}
if p.NewHeight > 0 && p.NewHeight != dy {
if p.NewHeight <= dy {
img, err = shrinkVertFn(c, img)
if err != nil {
return nil, err
}
} else {
img, err = enlargeVertFn(c, img)
if err != nil {
return nil, err
}
}
} else {
img, err = enlargeHorizFn(c, img)
if err != nil {
return nil, err
}
}
}
rCount++
return img, nil
}
// shrinkVertFn calls itself recursively to shrink the image vertically.
shrinkVertFn = func(c *Carver, img *image.NRGBA) (*image.NRGBA, error) {
p.vRes = true
dx, dy := img.Bounds().Dx(), img.Bounds().Dy()
// If the image is resized both horizontally and vertically we need
// to rotate the image each time we are invoking the shrink function.
// Otherwise we rotate the image only once, right before calling this function.
if resizeXY {
dx, dy = img.Bounds().Dy(), img.Bounds().Dx()
img = c.RotateImage90(img)
}
if dx > p.NewHeight {
img, err = p.shrink(c, img)
if err != nil {
return nil, err
}
if resizeXY {
img = c.RotateImage270(img)
}
if p.NewWidth > 0 && p.NewWidth != dy {
if p.NewWidth <= dy {
img, err = shrinkHorizFn(c, img)
if err != nil {
return nil, err
}
} else {
img, err = enlargeHorizFn(c, img)
if err != nil {
return nil, err
}
}
} else {
img, err = shrinkVertFn(c, img)
if err != nil {
return nil, err
}
}
} else {
if resizeXY {
img = c.RotateImage270(img)
}
}
rCount++
return img, nil
}
// enlargeVertFn calls itself recursively to enlarge the image vertically.
enlargeVertFn = func(c *Carver, img *image.NRGBA) (*image.NRGBA, error) {
p.vRes = true
dx, dy := img.Bounds().Dx(), img.Bounds().Dy()
if resizeXY {
dx, dy = img.Bounds().Dy(), img.Bounds().Dx()
img = c.RotateImage90(img)
}
if dx < p.NewHeight {
img, err = p.enlarge(c, img)
if err != nil {
return nil, err
}
if resizeXY {
img = c.RotateImage270(img)
}
if p.NewWidth > 0 && p.NewWidth != dy {
if p.NewWidth <= dy {
img, err = shrinkHorizFn(c, img)
if err != nil {
return nil, err
}
} else {
img, err = enlargeHorizFn(c, img)
if err != nil {
return nil, err
}
}
} else {
img, err = enlargeVertFn(c, img)
if err != nil {
return nil, err
}
}
} else {
if resizeXY {
img = c.RotateImage270(img)
}
}
rCount++
return img, nil
}
if p.Percentage || p.Square {
pw = c.Width - c.Height
ph = c.Height - c.Width
// In case pw and ph is zero, it means that the target image is square.
// In this case we can simply resize the image without running the carving operation.
if p.Percentage && pw == 0 && ph == 0 {
pw = c.Width - int(float64(c.Width)-(float64(p.NewWidth)/100*float64(c.Width)))
ph = c.Height - int(float64(c.Height)-(float64(p.NewHeight)/100*float64(c.Height)))
p.NewWidth = utils.Abs(c.Width - pw)
p.NewHeight = utils.Abs(c.Height - ph)
resImgSize := utils.Min(p.NewWidth, p.NewHeight)
return imaging.Resize(img, resImgSize, 0, imaging.Lanczos), nil
}
// When the square option is used the image will be resized to a square based on the shortest edge.
if p.Square {
// Calling the image rescale method only when both a new width and height is provided.
if p.NewWidth != 0 && p.NewHeight != 0 {
p.NewWidth = utils.Min(p.NewWidth, p.NewHeight)
p.NewHeight = p.NewWidth
newImg = p.calculateFitness(img, c)
dst := image.NewNRGBA(newImg.Bounds())
draw.Draw(dst, newImg.Bounds(), newImg, image.Point{}, draw.Src)
img = dst
nw, nh := img.Bounds().Dx(), img.Bounds().Dy()
p.NewWidth = utils.Min(nw, nh)
p.NewHeight = p.NewWidth
} else {
return nil, errors.New("please provide a new WIDTH and HEIGHT when using the square option")
}
}
// Use the Percentage flag only for shrinking the image.
if p.Percentage {
// Calculate the new image size based on the provided percentage.
pw = c.Width - int(float64(c.Width)-(float64(p.NewWidth)/100*float64(c.Width)))
ph = c.Height - int(float64(c.Height)-(float64(p.NewHeight)/100*float64(c.Height)))
if p.NewWidth != 0 {
p.NewWidth = utils.Abs(c.Width - pw)
}
if p.NewHeight != 0 {
p.NewHeight = utils.Abs(c.Height - ph)
}
if pw >= c.Width || ph >= c.Height {
return nil, errors.New("cannot use the percentage flag for image enlargement")
}
}
}
// Rescale the image when it is resized both horizontally and vertically.
// First the image is scaled down or up by preserving the image aspect ratio,
// then the seam carving algorithm is applied only to the remaining pixels.
// Scale the width and height by the smaller factor (i.e Min(wScaleFactor, hScaleFactor))
// Example: input: 5000x2500, scale: 2160x1080, final target: 1920x1080
if (c.Width > p.NewWidth && c.Height > p.NewHeight) &&
(p.NewWidth != 0 && p.NewHeight != 0) {
newImg = p.calculateFitness(img, c)
dx0, dy0 := img.Bounds().Max.X, img.Bounds().Max.Y
dx1, dy1 := newImg.Bounds().Max.X, newImg.Bounds().Max.Y
// Rescale the image when the new image width or height are preserved, otherwise
// it might happen, that the generated image size does not match with the requested image size.
if !((p.NewWidth == 0 && dx0 == dx1) || (p.NewHeight == 0 && dy0 == dy1)) {
dst := image.NewNRGBA(newImg.Bounds())
draw.Draw(dst, newImg.Bounds(), newImg, image.Point{}, draw.Src)
img = dst
}
}
// Run the carver function if the desired image width is not identical with the rescaled image width.
if newWidth > 0 && p.NewWidth != c.Width {
if p.NewWidth > c.Width {
img, err = enlargeHorizFn(c, img)
if err != nil {
return nil, err
}
} else {
img, err = shrinkHorizFn(c, img)
if err != nil {
return nil, err
}
}
}
// Run the carver function if the desired image height is not identical with the rescaled image height.
if newHeight > 0 && p.NewHeight != c.Height {
if !resizeXY {
img = c.RotateImage90(img)
if len(p.MaskPath) > 0 {
p.Mask = c.RotateImage90(p.Mask)
}
if len(p.RMaskPath) > 0 {
p.RMask = c.RotateImage90(p.RMask)
}
}
if p.NewHeight > c.Height {
img, err = enlargeVertFn(c, img)
if err != nil {
return nil, err
}
} else {
img, err = shrinkVertFn(c, img)
if err != nil {
return nil, err
}
}
if !resizeXY {
img = c.RotateImage270(img)
if len(p.MaskPath) > 0 {
p.Mask = c.RotateImage270(p.Mask)
}
if len(p.RMaskPath) > 0 {
p.RMask = c.RotateImage270(p.RMask)
}
}
}
// Signal that the process is done and no more data is sent through the channel.
go func() {
imgWorker <- worker{
carver: nil,
img: nil,
done: true,
}
}()
return img, nil
}
// calculateFitness iteratively try to find the best image aspect ratio for the rescale.
func (p *Processor) calculateFitness(img *image.NRGBA, c *Carver) *image.NRGBA {
var (
w = float64(c.Width)
h = float64(c.Height)
nw = float64(p.NewWidth)
nh = float64(p.NewHeight)
newImg *image.NRGBA
)
wsf := w / nw
hsf := h / nh
sw := math.Round(w / math.Min(wsf, hsf))
sh := math.Round(h / math.Min(wsf, hsf))
if sw <= sh {
newImg = imaging.Resize(img, 0, int(sw), imaging.Lanczos)
if len(p.MaskPath) > 0 {
p.Mask = imaging.Resize(p.Mask, 0, int(sw), imaging.Lanczos)
}
if len(p.RMaskPath) > 0 {
p.RMask = imaging.Resize(p.RMask, 0, int(sw), imaging.Lanczos)
}
} else {
newImg = imaging.Resize(img, 0, int(sh), imaging.Lanczos)
if len(p.MaskPath) > 0 {
p.Mask = imaging.Resize(p.Mask, 0, int(sh), imaging.Lanczos)
}
if len(p.RMaskPath) > 0 {
p.RMask = imaging.Resize(p.RMask, 0, int(sh), imaging.Lanczos)
}
}
dx, dy := newImg.Bounds().Max.X, newImg.Bounds().Max.Y
c.Width = dx
c.Height = dy
if int(sw) < p.NewWidth || int(sh) < p.NewHeight {
newImg = p.calculateFitness(newImg, c)
}
return newImg
}
// Process encodes the resized image into an io.Writer interface.
// We are using the io package, since we can provide different input and output types,
// as long as they implement the io.Reader and io.Writer interface.
func (p *Processor) Process(r io.Reader, w io.Writer) error {
var err error
if p.FaceDetect {
// Instantiate a new Pigo object in case the face detection option is used.
p.FaceDetector = pigo.NewPigo()
// Unpack the binary file. This will return the number of cascade trees,
// the tree depth, the threshold and the prediction from tree's leaf nodes.
p.FaceDetector, err = p.FaceDetector.Unpack(cascadeFile)
if err != nil {
return fmt.Errorf("error unpacking the cascade file: %v", err)
}
}
if p.NewWidth != 0 && p.NewHeight != 0 {
resizeXY = true
}
src, _, err := image.Decode(r)
if err != nil {
return err
}
img := p.imgToNRGBA(src)
p.GuiDebug = image.NewNRGBA(img.Bounds())
if len(p.MaskPath) > 0 {
mf, err := os.Open(p.MaskPath)
if err != nil {
return fmt.Errorf("could not open the mask file: %v", err)
}
ctype, err := utils.DetectContentType(mf.Name())
if err != nil {
return err
}
if !strings.Contains(ctype.(string), "image") {
return fmt.Errorf("the mask should be an image file")
}
mask, _, err := image.Decode(mf)
if err != nil {
return fmt.Errorf("could not decode the mask file: %v", err)
}
p.Mask = p.Dither(p.imgToNRGBA(mask))
p.GuiDebug = p.Mask
}
if len(p.RMaskPath) > 0 {
rmf, err := os.Open(p.RMaskPath)
if err != nil {
return fmt.Errorf("could not open the mask file: %v", err)
}
ctype, err := utils.DetectContentType(rmf.Name())
if err != nil {
return err
}
if !strings.Contains(ctype.(string), "image") {
return fmt.Errorf("the mask should be an image file")
}
rmask, _, err := image.Decode(rmf)
if err != nil {
return fmt.Errorf("could not decode the mask file: %v", err)
}
p.RMask = p.Dither(p.imgToNRGBA(rmask))
p.GuiDebug = p.RMask
}
if p.Preview {
guiWidth := img.Bounds().Max.X
guiHeight := img.Bounds().Max.Y
if p.NewWidth > guiWidth {
guiWidth = p.NewWidth
}
if p.NewHeight > guiHeight {
guiHeight = p.NewHeight
}
if resizeXY {
guiWidth = 1024
guiHeight = 640
}
guiParams := struct {
width int
height int
}{
width: guiWidth,
height: guiHeight,
}
// Lunch Gio GUI thread.
go p.showPreview(imgWorker, errs, guiParams)
}
switch w := w.(type) {
case *os.File:
ext := filepath.Ext(w.Name())
switch ext {
case "", ".jpg", ".jpeg":
res, err := resize(p, img)
if err != nil {
return err
}
return jpeg.Encode(w, res, &jpeg.Options{Quality: 100})
case ".png":
res, err := resize(p, img)
if err != nil {
return err
}
return png.Encode(w, res)
case ".bmp":
res, err := resize(p, img)
if err != nil {
return err
}
return bmp.Encode(w, res)
case ".gif":
g = new(gif.GIF)
isGif = true
_, err := resize(p, img)
if err != nil {
return err
}
return writeGifToFile(w.Name(), g)
default:
return errors.New("unsupported image format")
}
default:
res, err := resize(p, img)
if err != nil {
return err
}
return jpeg.Encode(w, res, &jpeg.Options{Quality: 100})
}
}
// shrink reduces the image dimension either horizontally or vertically.
func (p *Processor) shrink(c *Carver, img *image.NRGBA) (*image.NRGBA, error) {
width, height := img.Bounds().Max.X, img.Bounds().Max.Y
c = NewCarver(width, height)
if _, err := c.ComputeSeams(p, img); err != nil {
return nil, err
}
seams := c.FindLowestEnergySeams(p)
img = c.RemoveSeam(img, seams, p.Debug)
if len(p.MaskPath) > 0 {
p.Mask = c.RemoveSeam(p.Mask, seams, false)
draw.Draw(p.GuiDebug, img.Bounds(), p.Mask, image.Point{}, draw.Over)
}
if len(p.RMaskPath) > 0 {
p.RMask = c.RemoveSeam(p.RMask, seams, false)
draw.Draw(p.GuiDebug, img.Bounds(), p.RMask, image.Point{}, draw.Over)
}
if isGif {
p.encodeImgToGif(c, img, g)
}
go func() {
select {
case imgWorker <- worker{
carver: c,
img: img,
debug: p.GuiDebug,
done: false,
}:
case <-errs:
return
}
}()
return img, nil
}
// enlarge increases the image dimension either horizontally or vertically.
func (p *Processor) enlarge(c *Carver, img *image.NRGBA) (*image.NRGBA, error) {
width, height := img.Bounds().Max.X, img.Bounds().Max.Y
c = NewCarver(width, height)
if _, err := c.ComputeSeams(p, img); err != nil {
return nil, err
}
seams := c.FindLowestEnergySeams(p)
img = c.AddSeam(img, seams, p.Debug)
if len(p.MaskPath) > 0 {
p.Mask = c.AddSeam(p.Mask, seams, false)
p.GuiDebug = p.Mask
}
if len(p.RMaskPath) > 0 {
p.RMask = c.AddSeam(p.RMask, seams, false)
p.GuiDebug = p.RMask
}
if isGif {
p.encodeImgToGif(c, img, g)
}
go func() {
select {
case imgWorker <- worker{
carver: c,
img: img,
debug: p.GuiDebug,
done: false,
}:
case <-errs:
return
}
}()
return img, nil
}
// imgToNRGBA converts any image type to *image.NRGBA with min-point at (0, 0).
func (p *Processor) imgToNRGBA(img image.Image) *image.NRGBA {
srcBounds := img.Bounds()
if srcBounds.Min.X == 0 && srcBounds.Min.Y == 0 {
if src0, ok := img.(*image.NRGBA); ok {
return src0
}
}
srcMinX := srcBounds.Min.X
srcMinY := srcBounds.Min.Y
dstBounds := srcBounds.Sub(srcBounds.Min)
dstW := dstBounds.Dx()
dstH := dstBounds.Dy()
dst := image.NewNRGBA(dstBounds)
switch src := img.(type) {
case *image.NRGBA:
rowSize := srcBounds.Dx() * 4
for dstY := 0; dstY < dstH; dstY++ {
di := dst.PixOffset(0, dstY)
si := src.PixOffset(srcMinX, srcMinY+dstY)
for dstX := 0; dstX < dstW; dstX++ {
copy(dst.Pix[di:di+rowSize], src.Pix[si:si+rowSize])
}
}
case *image.YCbCr:
for dstY := 0; dstY < dstH; dstY++ {
di := dst.PixOffset(0, dstY)
for dstX := 0; dstX < dstW; dstX++ {
srcX := srcMinX + dstX
srcY := srcMinY + dstY
siy := src.YOffset(srcX, srcY)
sic := src.COffset(srcX, srcY)
r, g, b := color.YCbCrToRGB(src.Y[siy], src.Cb[sic], src.Cr[sic])
dst.Pix[di+0] = r
dst.Pix[di+1] = g
dst.Pix[di+2] = b
dst.Pix[di+3] = 0xff
di += 4
}
}
default:
for dstY := 0; dstY < dstH; dstY++ {
di := dst.PixOffset(0, dstY)
for dstX := 0; dstX < dstW; dstX++ {
c := color.NRGBAModel.Convert(img.At(srcMinX+dstX, srcMinY+dstY)).(color.NRGBA)
dst.Pix[di+0] = c.R
dst.Pix[di+1] = c.G
dst.Pix[di+2] = c.B
dst.Pix[di+3] = c.A
di += 4
}
}
}
return dst
}
// encodeImgToGif encodes the provided image to a Gif file.
func (p *Processor) encodeImgToGif(c *Carver, src image.Image, g *gif.GIF) {
dx, dy := src.Bounds().Max.X, src.Bounds().Max.Y
dst := image.NewPaletted(image.Rect(0, 0, dx, dy), palette.Plan9)
if p.NewHeight != 0 {
dst = image.NewPaletted(image.Rect(0, 0, dy, dx), palette.Plan9)
}
if p.NewWidth > dx {
dx += rCount
g.Config.Width = dst.Bounds().Max.X + 1
g.Config.Height = dst.Bounds().Max.Y + 1
} else {
dx -= rCount
}
if p.NewHeight > dx {
dx += rCount
g.Config.Width = dst.Bounds().Max.X + 1
g.Config.Height = dst.Bounds().Max.Y + 1
} else {
dx -= rCount
}
if p.NewHeight != 0 {
src = c.RotateImage270(src.(*image.NRGBA))
}
draw.Draw(dst, src.Bounds(), src, image.Point{}, draw.Src)
g.Image = append(g.Image, dst)
g.Delay = append(g.Delay, 0)
}
// writeGifToFile writes the encoded Gif file to the destination file.
func writeGifToFile(path string, g *gif.GIF) error {
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
return gif.EncodeAll(f, g)
}