// Take a folder name, read all the images within, and return them in an array.
func ReadImageFolder(path string, log *golog.Logger) (images []Image, err error) {
dir, err := os.Open(path)
if err != nil {
log.Errorf("Couldn't open folder '%s'", path)
return nil, err
} else {
defer dir.Close()
}
dirInfo, err := dir.Stat()
if err != nil {
log.Errorf("Couldn't gather information for folder '%s'", path)
return nil, err
}
if !dirInfo.IsDir() {
// just ignore the request if it isn't a folder
return nil, nil
}
names, err := dir.Readdirnames(0)
if err != nil {
log.Errorf("Problem gathering names of image files in '%s'", path)
return nil, err
}
// put these in a canonical order, otherwise it'll be platform-specific
sort.Strings(names)
images = make([]Image, 0)
for _, name := range names {
fullName := filepath.Join(path, name)
imgFile, err := os.Open(fullName)
if err != nil {
log.Errorf("Couldn't open image file '%s'", fullName)
continue
} else {
defer imgFile.Close()
}
imgInfo, err := imgFile.Stat()
if err != nil {
log.Errorf("Couldn't gather information for image file '%s'", fullName)
}
if imgInfo.IsDir() {
// skip non-files
continue
}
ext := strings.ToLower(filepath.Ext(name))
if ext == ".png" {
img, err := png.Decode(imgFile)
if err != nil {
log.Errorf("Problem decoding png image in '%s'", fullName)
continue
}
name = name[0 : len(name)-len(ext)]
images = append(images, Image{name, img})
} else if ext == ".jpg" || ext == ".jpeg" {
img, err := jpeg.Decode(imgFile)
if err != nil {
log.Errorf("Problem decoding jpeg image in '%s'", fullName)
continue
}
name = name[0 : len(name)-len(ext)]
images = append(images, Image{name, img})
} else {
log.Debugf("Ignoring unrecognized file '%s'", fullName)
}
}
if len(images) == 0 {
log.Warningf("Folder '%s' contains no images; no sprite-sheet will be generated", path)
}
return images, nil
}
