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pict.go
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pict.go
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package main
import (
"fmt"
"log"
"path"
"time"
"github.com/aamcrae/pweb/data"
)
type Pict struct {
srcFile string // Source filename, relative to cwd
srcPath string // Full pathname of source file
destDir string // Destination directory for web page
thumbFile string // Thumbnail filename relative to destDir
dlFile string // Download filename relative to destDir
previewFile string // Preview filename relative to destDir
destFile string // Image filename relative to destDir
baseName string // Base filename
mtime time.Time // File modified time
exif *Exif // Lazily loaded Exif data
width, height int
}
func NewPict(fname, srcDir, destDir string) (*Pict, error) {
mtime, err := getMtime(fname)
if err != nil {
return nil, err
}
d, name := path.Split(fname)
baseName := name
for d != "" {
var f string
d = path.Dir(d)
d, f = path.Split(d)
name = f + "_" + name
}
return &Pict{
srcFile: fname,
srcPath: path.Join(srcDir, fname),
destDir: destDir,
thumbFile: path.Join("t", name),
dlFile: path.Join("d", name),
previewFile: path.Join("p", name),
destFile: name,
mtime: mtime,
baseName: baseName,
}, nil
}
// GetExif returns the EXIF data for the picture, loading it from the
// file if it is not already loaded.
func (p *Pict) GetExif() *Exif {
if p.exif == nil {
var err error
if p.exif, err = ReadExif(p.srcFile); err != nil {
log.Fatalf("%s: exif read %v", p.srcFile, err)
}
if p.exif.ts.IsZero() {
// Use file timestamp
p.exif.ts = p.mtime
}
}
return p.exif
}
// AddGallery adds this picture to the gallery XML structure.
func (p *Pict) AddToGallery(g *data.Gallery, download int) {
var ph data.Photo
exif := p.GetExif()
ph.Name = p.baseName
ph.Filename = p.destFile
ph.Date = exif.ts.Format("03:04 PM Monday, 02 January 2006")
ph.Original.Width = p.width
ph.Original.Height = p.height
ph.Title = exif.title
ph.Caption = exif.caption
ph.Exposure = exif.exposure
ph.ISO = exif.iso
ph.Aperture = exif.fstop
ph.FocalLength = exif.focal_len
if download != DL_NONE {
ph.Download = p.dlFile
}
g.Photos = append(g.Photos, ph)
}
// Resize resizes this picture to a thumbnail size, a preview size, and
// a web page size. A resizer function is provided to perform the action
// to allow selection of different image processors.
func (p *Pict) Resize(handler NewImage, tw, th, pw, ph, iw, ih int) {
exif := p.GetExif()
if exif.width != 0 && exif.height != 0 {
p.width = exif.width
p.height = exif.height
}
// Check whether timestamp is the same, and we have the original resolution
destPath := path.Join(p.destDir, p.destFile)
mt, _ := getMtime(destPath)
if mt == p.mtime && p.width > 0 && p.height > 0 {
if *verbose {
fmt.Printf("Skipping read/decode of %s\n", p.destFile)
}
return
}
img, err := handler(p.srcFile)
if err != nil {
log.Fatalf("%s: %v", p.srcFile, err)
}
p.width = img.Width()
p.height = img.Height()
if mt == p.mtime {
if *verbose {
fmt.Printf("Skipping resize of %s\n", p.destFile)
}
return
}
if *verbose {
fmt.Printf("Resizing %s from %d x %d\n", p.srcFile, img.Width(), img.Height())
}
switch exif.orientation {
case "8":
img.Rotate(Rotate90)
case "3":
img.Rotate(Rotate180)
case "6":
img.Rotate(Rotate270)
}
img.Write(destPath, p.mtime, iw, ih, 90)
img.Write(path.Join(p.destDir, p.previewFile), p.mtime, pw, ph, 80)
img.Write(path.Join(p.destDir, p.thumbFile), p.mtime, tw, th, 80)
}