// image: The image must use this form key name
// w: Desired width of the image
// h: Desired height of the image
func cropImage(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
http.Error(w, fmt.Sprintf("%s", err), 400)
}
}()
file, header, err := r.FormFile("image")
if err != nil {
http.Error(w, "Cannot read image data", 400)
}
cWidth := r.FormValue("w")
cHeight := r.FormValue("h")
if cWidth == "" || cHeight == "" {
http.Error(w, "Must supply both width and height", 400)
} else {
originalImage, err := ioutil.ReadAll(file)
if err != nil {
http.Error(w, "Cannot read image data", 400)
}
cWidth, err := strconv.Atoi(cWidth)
if err != nil {
http.Error(w, "Bad value for crop width supplied", 400)
}
cHeight, err := strconv.Atoi(cHeight)
if err != nil {
http.Error(w, "Bad value for crop height supplied", 400)
}
log.Printf("Recieved %s, Desired Width and height: %d, %d\n", header.Filename, cHeight, cWidth)
// Call the crop.Crop() function passing the Response Writer object
// to it
// XXX: Add proper error handling via recover()
crop.Crop(originalImage, cWidth, cHeight, w)
}
}
func cropper(inputFilePath string, cWidth int, cHeight int, done chan Result) {
// Recover from any panic here so that one bad image doesn't bring the entire
// program down
defer func() {
if err := recover(); err != nil {
done <- Result{FilePath: inputFilePath, Error: fmt.Sprintf("%s", err)}
}
}()
imageData, _ := ioutil.ReadFile(inputFilePath)
croppedFileDir, fileName := filepath.Split(inputFilePath)
croppedFileName := fmt.Sprintf("%scropped_%s", croppedFileDir, fileName)
croppedFile, _ := os.Create(croppedFileName)
defer croppedFile.Close()
croppedFileWriter := bufio.NewWriter(croppedFile)
crop.Crop(imageData, cWidth, cHeight, croppedFileWriter)
croppedFileWriter.Flush()
// We are done with this file
done <- Result{FilePath: inputFilePath, Error: ""}
}
func ExampleCrop() {
// Test image to crop
inputFilePath := "../test_images/cat1.jpg"
imageData, err := ioutil.ReadFile(inputFilePath)
if err != nil {
log.Fatal("Cannot open file", err)
}
// Write the cropped image to a file cropped_cat1.jpg
croppedFileDir, fileName := filepath.Split(inputFilePath)
croppedFileName := fmt.Sprintf("%scropped_%s", croppedFileDir, fileName)
croppedFile, err := os.Create(croppedFileName)
if err != nil {
log.Fatal("Could not create file for cropped image")
}
defer croppedFile.Close()
croppedFileWriter := bufio.NewWriter(croppedFile)
// Crop width and height
cWidth := 5000
cHeight := 4000
crop.Crop(imageData, cWidth, cHeight, croppedFileWriter)
croppedFileWriter.Flush()
}