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create cover title filter

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This commit is contained in:
Celogeek 2023-04-24 16:25:10 +02:00
parent 4e4245fd21
commit 58ed44c28d
Signed by: celogeek
SSH Key Fingerprint: SHA256:njNJLzoLQdbV9PC6ehcruRb0QnEgxABoCYZ+0+aUIYc
3 changed files with 87 additions and 59 deletions
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2
internal/epub/epub.go
View File

@ -252,7 +252,7 @@ func (e *ePub) Write() error {
return err
}
}
if err := wz.WriteImage(e.createTitleImageData(title, part.Cover, i+1, totalParts)); err != nil {
if err := wz.WriteImage(e.coverTitleImageData(title, part.Cover, i+1, totalParts)); err != nil {
return err
}

61
internal/epub/epub_image_processing.go
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@ -6,7 +6,6 @@ import (
"fmt"
"image"
"image/color"
"image/draw"
_ "image/jpeg"
_ "image/png"
"io"
@ -17,17 +16,14 @@ import (
"strings"
"sync"
epubfilters "github.com/celogeek/go-comic-converter/v2/internal/epub/filters"
epubimage "github.com/celogeek/go-comic-converter/v2/internal/epub/image"
epubimagedata "github.com/celogeek/go-comic-converter/v2/internal/epub/imagedata"
"github.com/celogeek/go-comic-converter/v2/internal/sortpath"
"github.com/disintegration/gift"
"github.com/golang/freetype"
"github.com/golang/freetype/truetype"
"github.com/nwaples/rardecode"
pdfimage "github.com/raff/pdfreader/image"
"github.com/raff/pdfreader/pdfread"
"golang.org/x/image/font"
"golang.org/x/image/font/gofont/gomonobold"
"golang.org/x/image/tiff"
_ "golang.org/x/image/webp"
)
@ -458,62 +454,11 @@ func loadPdf(input string) (int, chan *imageTask, error) {
return nbPages, output, nil
}
func (e *ePub) createTitleImageData(title string, img *epubimage.Image, currentPart, totalPart int) *epubimagedata.ImageData {
func (e *ePub) coverTitleImageData(title string, img *epubimage.Image, currentPart, totalPart int) *epubimagedata.ImageData {
// Create a blur version of the cover
g := gift.New(gift.GaussianBlur(8))
g := gift.New(epubfilters.CoverTitle(title))
dst := image.NewGray(g.Bounds(img.Raw.Bounds()))
g.Draw(dst, img.Raw)
// Calculate size of title
f, _ := truetype.Parse(gomonobold.TTF)
borderSize := 4
var fontSize, textWidth, textHeight int
for fontSize = 64; fontSize >= 12; fontSize -= 1 {
face := truetype.NewFace(f, &truetype.Options{Size: float64(fontSize), DPI: 72})
textWidth = font.MeasureString(face, title).Ceil()
textHeight = face.Metrics().Ascent.Ceil() + face.Metrics().Descent.Ceil()
if textWidth+2*borderSize < img.Width && 3*textHeight+2*borderSize < img.Height {
break
}
}
// Draw rectangle in the middle of the image
textPosStart := img.Height/2 - textHeight/2
textPosEnd := img.Height/2 + textHeight/2
marginSize := fontSize
borderArea := image.Rect(0, textPosStart-borderSize-marginSize, img.Width, textPosEnd+borderSize+marginSize)
textArea := image.Rect(borderSize, textPosStart-marginSize, img.Width-borderSize, textPosEnd+marginSize)
draw.Draw(
dst,
borderArea,
image.Black,
image.Point{},
draw.Over,
)
draw.Draw(
dst,
textArea,
image.White,
image.Point{},
draw.Over,
)
// Draw text
c := freetype.NewContext()
c.SetDPI(72)
c.SetFontSize(float64(fontSize))
c.SetFont(f)
c.SetClip(textArea)
c.SetDst(dst)
c.SetSrc(image.Black)
textLeft := img.Width/2 - textWidth/2
if textLeft < borderSize {
textLeft = borderSize
}
c.DrawString(title, freetype.Pt(textLeft, img.Height/2+textHeight/4))
return epubimagedata.NewRaw("OEBPS/Images/title.jpg", dst, e.Image.Quality)
}

83
internal/epub/filters/epub_filters_cover_title.go Normal file
View File

@ -0,0 +1,83 @@
package epubfilters
import (
"image"
"image/draw"
"github.com/disintegration/gift"
"github.com/golang/freetype"
"github.com/golang/freetype/truetype"
"golang.org/x/image/font"
"golang.org/x/image/font/gofont/gomonobold"
)
func CoverTitle(title string) gift.Filter {
return &coverTitle{title}
}
type coverTitle struct {
title string
}
func (p *coverTitle) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
return srcBounds
}
func (p *coverTitle) Draw(dst draw.Image, src image.Image, options *gift.Options) {
// Create a blur version of the cover
g := gift.New(gift.GaussianBlur(4))
g.Draw(dst, src)
srcWidth, srcHeight := src.Bounds().Dx(), src.Bounds().Dy()
// Calculate size of title
f, _ := truetype.Parse(gomonobold.TTF)
borderSize := 4
var fontSize, textWidth, textHeight int
for fontSize = 64; fontSize >= 12; fontSize -= 1 {
face := truetype.NewFace(f, &truetype.Options{Size: float64(fontSize), DPI: 72})
textWidth = font.MeasureString(face, p.title).Ceil()
textHeight = face.Metrics().Ascent.Ceil() + face.Metrics().Descent.Ceil()
if textWidth+2*borderSize < srcWidth && 3*textHeight+2*borderSize < srcHeight {
break
}
}
// Draw rectangle in the middle of the image
textPosStart := srcHeight/2 - textHeight/2
textPosEnd := srcHeight/2 + textHeight/2
marginSize := fontSize
borderArea := image.Rect(0, textPosStart-borderSize-marginSize, srcWidth, textPosEnd+borderSize+marginSize)
textArea := image.Rect(borderSize, textPosStart-marginSize, srcWidth-borderSize, textPosEnd+marginSize)
draw.Draw(
dst,
borderArea,
image.Black,
image.Point{},
draw.Over,
)
draw.Draw(
dst,
textArea,
image.White,
image.Point{},
draw.Over,
)
// Draw text
c := freetype.NewContext()
c.SetDPI(72)
c.SetFontSize(float64(fontSize))
c.SetFont(f)
c.SetClip(textArea)
c.SetDst(dst)
c.SetSrc(image.Black)
textLeft := srcWidth/2 - textWidth/2
if textLeft < borderSize {
textLeft = borderSize
}
c.DrawString(p.title, freetype.Pt(textLeft, srcHeight/2+textHeight/4))
}