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thumb.go
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thumb.go
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package theme_thumb
import (
"errors"
"fmt"
"os"
"path/filepath"
"syscall"
"time"
"pkg.deepin.io/dde/api/theme_thumb/cursor"
"pkg.deepin.io/dde/api/theme_thumb/gtk"
"pkg.deepin.io/dde/api/theme_thumb/icon"
"pkg.deepin.io/lib/xdg/basedir"
)
var scaleFactor float64
const (
width = 320
height = 70
)
var cacheDir = filepath.Join(basedir.GetUserCacheDir(), "deepin", "dde-api", "theme_thumb")
func getScaleDir() string {
return fmt.Sprintf("X%.2f", scaleFactor)
}
func getTypeDir(type0 string, version int) string {
return fmt.Sprintf("%s-v%d", type0, version)
}
func Init(scaleFactor0 float64) {
scaleFactor = scaleFactor0
removeUnusedScaleDirs()
removeAllTypesOldVersionDirs()
}
func removeUnusedScaleDirs() {
removeUnusedDirs(cacheDir+"/X*", getScaleDir())
}
func removeAllTypesOldVersionDirs() {
scaleDir := getScaleDir()
removeOldVersionDirs(scaleDir, "gtk", gtk.Version)
removeOldVersionDirs(scaleDir, "cursor", cursor.Version)
removeOldVersionDirs(scaleDir, "icon", icon.Version)
}
func removeOldVersionDirs(scaleDir, type0 string, version int) {
pattern := filepath.Join(cacheDir, scaleDir, type0+"-v*")
usedDir := getTypeDir(type0, version)
removeUnusedDirs(pattern, usedDir)
}
func removeUnusedDirs(pattern string, usedDir string) {
dirs, err := filepath.Glob(pattern)
if err != nil {
return
}
for _, dir := range dirs {
name := filepath.Base(dir)
if name != usedDir {
fmt.Println("rm dir", dir)
os.RemoveAll(dir)
}
}
}
func checkScaleFactor() error {
if scaleFactor <= 0 {
return errors.New("bad scale factor")
}
return nil
}
func GetCursor(id, descFile string) (string, error) {
err := checkScaleFactor()
if err != nil {
return "", err
}
out := prepareOutputPath("cursor", id, cursor.Version)
genNew, err := shouldGenerateNewCursor(descFile, out)
if err != nil {
return "", err
}
if !genNew {
return out, nil
}
err = cursor.Gen(descFile, width, height, scaleFactor, out)
if err != nil {
return "", err
}
return out, nil
}
func GetGtk(id, descFile string) (string, error) {
err := checkScaleFactor()
if err != nil {
return "", err
}
out := prepareOutputPath("gtk", id, gtk.Version)
genNew, err := shouldGenerateNew(descFile, out)
if err != nil {
return "", err
}
if !genNew {
return out, nil
}
err = gtk.Gen(id, width, height, scaleFactor, out)
if err != nil {
return "", err
}
return out, nil
}
func GetIcon(id, descFile string) (string, error) {
err := checkScaleFactor()
if err != nil {
return "", err
}
out := prepareOutputPath("icon", id, icon.Version)
genNew, err := shouldGenerateNew(descFile, out)
if err != nil {
return "", err
}
if !genNew {
return out, nil
}
err = icon.Gen(id, width, height, scaleFactor, out)
if err != nil {
return "", err
}
return out, nil
}
func shouldGenerateNew(descFile, out string) (bool, error) {
descFileInfo, err := os.Stat(descFile)
if err != nil {
return false, err
}
descFileCTime := getChangeTime(descFileInfo)
thumbFileInfo, err := os.Stat(out)
if err != nil {
if os.IsNotExist(err) {
return true, nil
}
return false, err
}
thumbFileCTime := getChangeTime(thumbFileInfo)
if descFileCTime.After(thumbFileCTime) {
return true, nil
}
return false, nil
}
func shouldGenerateNewCursor(descFile, out string) (bool, error) {
dir := filepath.Dir(descFile)
ptrFile := filepath.Join(dir, "cursors", "left_ptr")
return shouldGenerateNew(ptrFile, out)
}
// getChangeTime get time when file status was last changed.
func getChangeTime(fileInfo os.FileInfo) time.Time {
stat := fileInfo.Sys().(*syscall.Stat_t)
return time.Unix(int64(stat.Ctim.Sec), int64(stat.Ctim.Nsec))
}
// ex. $HOME/.cache/deepin/dde-api/theme_thumb/X1.00/icon-v0/deepin.png
func prepareOutputPath(type0, id string, version int) string {
scaleDir := getScaleDir()
typeDir := getTypeDir(type0, version)
dir := filepath.Join(cacheDir, scaleDir, typeDir)
os.MkdirAll(dir, 0755)
return filepath.Join(dir, id+".png")
}