compute original aspect ratio

internal/converter/options/converter_options.go

@@ -145,7 +145,7 @@ func (o *Options) LoadConfig() error {
 
 // Get current settings for fields that can be saved
 func (o *Options) ShowConfig() string {
-	var profileDesc, viewDesc string
+	var profileDesc string
 	profile := o.GetProfile()
 	if profile != nil {
 		profileDesc = fmt.Sprintf(
@@ -155,13 +155,6 @@ func (o *Options) ShowConfig() string {
 			profile.Width,
 			profile.Height,
 		)
-
-		perfectWidth, perfectHeight := profile.PerfectDim()
-		viewDesc = fmt.Sprintf(
-			"%dx%d",
-			perfectWidth,
-			perfectHeight,
-		)
 	}
 
 	sortpathmode := ""
@@ -181,8 +174,6 @@ func (o *Options) ShowConfig() string {
 		Condition bool
 	}{
 		{"Profile", profileDesc, true},
-		{"ViewRatio", fmt.Sprintf("1:%s", strings.TrimRight(fmt.Sprintf("%f", profiles.PerfectRatio), "0")), true},
-		{"View", viewDesc, true},
 		{"Format", o.Format, true},
 		{"Quality", o.Quality, o.Format == "jpeg"},
 		{"Grayscale", o.Grayscale, true},

internal/converter/profiles/converter_profiles.go

@@ -15,21 +15,6 @@ type Profile struct {
 	Height      int
 }
 
-// Recommended ratio of image for perfect rendering Portrait or Landscape.
-const PerfectRatio = 1.6
-
-// Compute best dimension based on device size
-func (p Profile) PerfectDim() (int, int) {
-	width, height := float64(p.Width), float64(p.Height)
-	perfectWidth, perfectHeight := height/PerfectRatio, width*PerfectRatio
-	if perfectWidth > width {
-		perfectWidth = width
-	} else {
-		perfectHeight = height
-	}
-	return int(perfectWidth), int(perfectHeight)
-}
-
 type Profiles []Profile
 
 // Initialize list of all supported profiles.

internal/epub/epub.go

@@ -6,6 +6,7 @@ package epub
 import (
 	"archive/zip"
 	"fmt"
+	"math"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -193,6 +194,39 @@ func (e *ePub) getTree(images []*epubimage.Image, skip_files bool) string {
 	return c.WriteString("")
 }
 
+func (e *ePub) ComputeViewPort(epubParts []*epubPart) {
+	// readjusting view port
+	var (
+		bestAspectRatio      float64
+		bestAspectRatioCount int
+		aspectRatio          = map[float64]int{}
+	)
+
+	trunc := func(v float64) float64 {
+		return float64(math.Round(v*100)) / 100
+	}
+
+	for _, p := range epubParts {
+		aspectRatio[trunc(p.Cover.OriginalAspectRatio)]++
+		for _, i := range p.Images {
+			aspectRatio[trunc(i.OriginalAspectRatio)/100]++
+		}
+	}
+
+	for k, v := range aspectRatio {
+		if v > bestAspectRatioCount {
+			bestAspectRatio, bestAspectRatioCount = k, v
+		}
+	}
+
+	viewWidth, viewHeight := int(float64(e.Image.View.Height)/bestAspectRatio), int(float64(e.Image.View.Width)*bestAspectRatio)
+	if viewWidth > e.Image.View.Width {
+		e.Image.View.Height = viewHeight
+	} else {
+		e.Image.View.Width = viewWidth
+	}
+}
+
 // create the zip
 func (e *ePub) Write() error {
 	type zipContent struct {
@@ -231,6 +265,7 @@ func (e *ePub) Write() error {
 		Quiet:       e.Quiet,
 	})
 
+	e.ComputeViewPort(epubParts)
 	for i, part := range epubParts {
 		ext := filepath.Ext(e.Output)
 		suffix := ""

internal/epub/image/epub_image.go

@@ -22,6 +22,7 @@ type Image struct {
 	Name                string
 	Position            string
 	Format              string
+	OriginalAspectRatio float64
 }
 
 // key name of the blank plage after the image

internal/epub/imageprocessor/epub_image_processor.go

@@ -96,6 +96,7 @@ func (e *EPUBImageProcessor) Load() (images []*epubimage.Image, err error) {
 						Path:                input.Path,
 						Name:                input.Name,
 						Format:              e.Image.Format,
+						OriginalAspectRatio: float64(src.Bounds().Dy()) / float64(src.Bounds().Dx()),
 					}
 
 					if err = imgStorage.Add(img.EPUBImgPath(), dst, e.Image.Quality); err != nil {

main.go

@@ -99,7 +99,6 @@ $ go install github.com/celogeek/go-comic-converter/v%d@%s
 	fmt.Fprintln(os.Stderr, cmd.Options)
 
 	profile := cmd.Options.GetProfile()
-	perfectWidth, perfectHeight := profile.PerfectDim()
 
 	if err := epub.New(&epuboptions.Options{
 		Input:                      cmd.Options.Input,
@@ -131,8 +130,8 @@ $ go install github.com/celogeek/go-comic-converter/v%d@%s
 			Manga:               cmd.Options.Manga,
 			HasCover:            cmd.Options.HasCover,
 			View: &epuboptions.View{
-				Width:  perfectWidth,
+				Width:  profile.Width,
-				Height: perfectHeight,
+				Height: profile.Height,
 				Color: epuboptions.Color{
 					Foreground: cmd.Options.ForegroundColor,
 					Background: cmd.Options.BackgroundColor,