celogeek/go-comic-converter
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resize and use img only

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This commit is contained in:
Celogeek 2022-12-25 21:16:34 +01:00
parent 7a9796000e
commit dc24b757c7
Signed by: celogeek
GPG Key ID: E6B7BDCFC446233A
1 changed files with 36 additions and 30 deletions
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66
internal/comic-converter/core.go
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@ -1,7 +1,6 @@
package comicconverter
import (
"fmt"
"image"
"image/color"
"image/jpeg"
@ -13,7 +12,6 @@ import (
type ComicConverter struct {
Options ComicConverterOptions
img image.Image
grayImg *image.Gray16
}
type ComicConverterOptions struct {
@ -46,25 +44,28 @@ func (c *ComicConverter) GrayScale() *ComicConverter {
panic("load image first")
}
c.grayImg = image.NewGray16(c.img.Bounds())
grayImg := image.NewGray16(c.img.Bounds())
draw.Draw(c.grayImg, c.grayImg.Bounds(), c.img, image.Point{}, draw.Src)
draw.Draw(grayImg, grayImg.Bounds(), c.img, image.Point{}, draw.Src)
c.img = grayImg
return c
}
func (c *ComicConverter) CropMarging() *ComicConverter {
if c.grayImg == nil {
panic("grayscale first")
if c.img == nil {
panic("load image first")
}
imgArea := c.grayImg.Bounds()
colorLimit := color.Gray16{60000}
imgArea := c.img.Bounds()
colorLimit := uint(color.Gray16{60000}.Y)
LEFT:
for x := imgArea.Min.X; x < imgArea.Max.X; x++ {
for y := imgArea.Min.Y; y < imgArea.Max.Y; y++ {
if c.grayImg.Gray16At(x, y).Y < colorLimit.Y {
cc, _, _, _ := color.Gray16Model.Convert(c.img.At(x, y)).RGBA()
if cc < uint32(colorLimit) {
break LEFT
}
}
@ -74,7 +75,8 @@ LEFT:
UP:
for y := imgArea.Min.Y; y < imgArea.Max.Y; y++ {
for x := imgArea.Min.X; x < imgArea.Max.X; x++ {
if c.grayImg.Gray16At(x, y).Y < colorLimit.Y {
cc, _, _, _ := color.Gray16Model.Convert(c.img.At(x, y)).RGBA()
if cc < uint32(colorLimit) {
break UP
}
}
@ -84,7 +86,8 @@ UP:
RIGHT:
for x := imgArea.Max.X - 1; x >= imgArea.Min.X; x-- {
for y := imgArea.Min.Y; y < imgArea.Max.Y; y++ {
if c.grayImg.Gray16At(x, y).Y < colorLimit.Y {
cc, _, _, _ := color.Gray16Model.Convert(c.img.At(x, y)).RGBA()
if cc < uint32(colorLimit) {
break RIGHT
}
}
@ -94,37 +97,42 @@ RIGHT:
BOTTOM:
for y := imgArea.Max.Y - 1; y >= imgArea.Min.Y; y-- {
for x := imgArea.Min.X; x < imgArea.Max.X; x++ {
if c.grayImg.Gray16At(x, y).Y < colorLimit.Y {
cc, _, _, _ := color.Gray16Model.Convert(c.img.At(x, y)).RGBA()
if cc < uint32(colorLimit) {
break BOTTOM
}
}
imgArea.Max.Y--
}
fmt.Println("CROP", imgArea)
grayImg := image.NewGray16(image.Rectangle{
Min: image.Point{0, 0},
Max: image.Point{imgArea.Dx(), imgArea.Dy()},
})
c.grayImg = c.grayImg.SubImage(imgArea).(*image.Gray16)
draw.Draw(grayImg, grayImg.Bounds(), c.img, imgArea.Min, draw.Src)
c.img = grayImg
return c
}
func (c *ComicConverter) Resize(w, h int) *ComicConverter {
if c.grayImg == nil {
panic("grayscale first")
if c.img == nil {
panic("load image first")
}
dim := c.grayImg.Bounds()
dim := c.img.Bounds()
origWidth := dim.Dx()
origHeight := dim.Dy()
width, heigth := origWidth*h/origHeight, origHeight*w/origWidth
fmt.Println("W:", origWidth, width, h)
fmt.Println("H:", origHeight, heigth, w)
if width > origWidth {
width = origWidth
} else if heigth > origHeight {
heigth = origHeight
if width > w {
width = w
}
if heigth > h {
heigth = h
}
imgGray := image.NewGray16(image.Rectangle{
@ -132,18 +140,16 @@ func (c *ComicConverter) Resize(w, h int) *ComicConverter {
Max: image.Point{width, heigth},
})
fmt.Println("RESIZE", imgGray.Bounds())
draw.BiLinear.Scale(imgGray, imgGray.Bounds(), c.img, c.img.Bounds(), draw.Src, nil)
draw.BiLinear.Scale(imgGray, imgGray.Bounds(), c.grayImg, c.grayImg.Bounds(), draw.Src, nil)
c.grayImg = imgGray
c.img = imgGray
return c
}
func (c *ComicConverter) Save(output string) *ComicConverter {
if c.grayImg == nil {
panic("grayscale first")
if c.img == nil {
panic("load image first")
}
o, err := os.Create(output)
if err != nil {
@ -156,7 +162,7 @@ func (c *ComicConverter) Save(output string) *ComicConverter {
quality = c.Options.Quality
}
err = jpeg.Encode(o, c.grayImg, &jpeg.Options{Quality: quality})
err = jpeg.Encode(o, c.img, &jpeg.Options{Quality: quality})
if err != nil {
panic(err)
}