func cropAndScale(avatar *Avatar) error {
img, format, err := avatar2Image(avatar)
if err != nil {
return err
}
x := img.Bounds().Dx()
y := img.Bounds().Dy()
size := min(x, y)
if x != y {
log.Printf("Cropping img from %vx%v to %vx%v", x, y, size, size)
img, err = cutter.Crop(img, cutter.Config{
Width: size,
Height: size,
Mode: cutter.Centered})
if err != nil {
return err
}
}
if size <= maxSize {
return nil
}
log.Printf("Resizing img from %vx%v to %vx%v", size, size, maxSize, maxSize)
resized := resize.Resize(uint(maxSize), uint(maxSize), img, resize.Bicubic)
image2Avatar(avatar, resized, format)
return nil
}
// Crop
// Crops an image based on the given dimensions
func (cropper *CropService) Crop(height, width uint, image image.Image, ext string) ([]byte, error) {
// Crop image
file, err := cutter.Crop(image, cutter.Config{
Width: int(width),
Height: int(height),
Options: cutter.Copy,
})
if err != nil {
return nil, err
}
return cropper.decoder.EncodeImage(file, ext)
}
// read, resize, crop and zip a 'screenshot' named 'name' into 'zipArchive'
func convert(zipFile *zip.Writer, infile io.Reader, filename string) error {
img, err := png.Decode(infile)
if err != nil {
return err
}
resized := resize.Resize(0, TargetHeight, img, resize.Bicubic)
croppedImg, _ := cutter.Crop(resized, cutter.Config{
Width: TargetWidth,
Height: TargetHeight,
Mode: cutter.Centered,
})
zippedFile, err := zipFile.Create(filename)
if err != nil {
return err
}
return jpeg.Encode(zippedFile, croppedImg, JpegQuality)
}
func CropImg(srcImg image.Image, dstWidth, dstHeight int) image.Image {
origBounds := srcImg.Bounds()
origWidth := origBounds.Dx()
origHeight := origBounds.Dy()
dstImg, err := cutter.Crop(srcImg, cutter.Config{
Height: dstHeight, // height in pixel or Y ratio(see Ratio Option below)
Width: dstWidth, // width in pixel or X ratio
Mode: cutter.TopLeft, // Accepted Mode: TopLeft, Centered
Anchor: image.Point{
origWidth / 12,
origHeight / 8}, // Position of the top left point
Options: 0, // Accepted Option: Ratio
})
if err != nil {
Logln("[GIN] Cannot crop image:" + err.Error())
return srcImg
}
return dstImg
}
/*
Crop() takes in four parameters:
imageData : byte[] representing the input image
cWidth : An int specifying the desired width of the cropped image
cHeight : An int specifying the desired height of the cropped image
w : An io.Writer to which to write the encoded ropped image bytes to
*/
func Crop(imageData []byte, cWidth int, cHeight int, w io.Writer) {
imageType := http.DetectContentType(imageData)
// Check if we can handle this image
if !validateImageType(imageType) {
panic("Cannot handle image of this type")
}
// We first decode the image
reader := bytes.NewReader(imageData)
img, _, err := image.Decode(reader)
if err != nil {
panic(err)
}
// Perform the cropping
croppedImg, err := cutter.Crop(img, cutter.Config{
Height: cHeight,
Width: cWidth,
Mode: cutter.TopLeft,
Anchor: image.Point{60, 10},
Options: 0,
})
if err != nil {
panic(err)
}
// Now we encode the cropped image data using the appropriate
// encoder and save it to the above file
switch imageType {
case "image/png":
err = png.Encode(w, croppedImg)
case "image/jpeg":
err = jpeg.Encode(w, croppedImg, &jpeg.Options{})
}
if err != nil {
panic(err)
}
}
func main() {
var imageURL string
flag.StringVar(&imageURL, "image", "", "")
flag.Parse()
if imageURL == "" {
imageURL = "http://pics.dmm.co.jp/digital/pcgame/guide/selen_0024/head.jpg"
}
resp, err := http.Get(imageURL)
if err != nil {
log.Fatalln(err)
}
log.Println(resp.Header.Get("Content-Type"))
img, err := jpeg.Decode(resp.Body)
if err != nil {
log.Fatal(err)
}
resp.Body.Close()
{
m := resize.Resize(300, 300, img, resize.Bicubic)
out, err := os.Create("resize.jpg")
if err != nil {
log.Fatal(err)
}
defer out.Close()
// write new image to file
jpeg.Encode(out, m, nil)
}
{
m := resize.Resize(300, 0, img, resize.Bicubic)
out, err := os.Create("resize_width.jpg")
if err != nil {
log.Fatal(err)
}
defer out.Close()
// write new image to file
jpeg.Encode(out, m, nil)
}
{
m := resize.Resize(0, 300, img, resize.Bicubic)
out, err := os.Create("resize_height.jpg")
if err != nil {
log.Fatal(err)
}
defer out.Close()
// write new image to file
jpeg.Encode(out, m, nil)
}
{
m := resize.Thumbnail(300, 300, img, resize.Bicubic)
out, err := os.Create("thumbnail.jpg")
if err != nil {
log.Fatal(err)
}
defer out.Close()
// write new image to file
jpeg.Encode(out, m, nil)
}
{
m, err := cutter.Crop(img, cutter.Config{
Width: 300,
Height: 300,
Anchor: image.Point{0, 0},
Mode: cutter.Centered, // optional, default value
})
out, err := os.Create("crop_centered.jpg")
if err != nil {
log.Fatal(err)
}
defer out.Close()
// write new image to file
jpeg.Encode(out, m, nil)
}
{
x, y := uint(640), uint(640)
if img.Bounds().Size().X < img.Bounds().Size().Y {
y = 0
} else {
x = 0
}
m, err := cutter.Crop(resize.Resize(x, y, img, resize.Bicubic), cutter.Config{
Width: 640,
Height: 640,
Anchor: image.Point{0, 0},
Mode: cutter.Centered, // optional, default value
})
out, err := os.Create("resize_crop_centered.jpg")
if err != nil {
log.Fatal(err)
}
defer out.Close()
// write new image to file
jpeg.Encode(out, m, nil)
}
}
func SaveImage(file io.Reader) (*Image, error) {
log.Println("Starting SaveImage")
imageId := uniuri.NewLen(20)
i, err := db.Get(Image{}, imageId)
for err == nil && i != nil {
// Shit, we generated an existing ImageId!
// Aren't we so lucky?!
imageId := uniuri.NewLen(20)
i, err = db.Get(Image{}, imageId)
}
if err != nil {
return nil, err
}
// Lets decode our image to work with it
originalImg, _, err := image.Decode(file)
if err != nil {
return nil, err
}
originalWidht := originalImg.Bounds().Dx()
originalHeight := originalImg.Bounds().Dy()
maxSize := ""
log.Printf("\nPreparing to save de image %dx%d\n", originalWidht, originalHeight)
// We will save 3 resized images
sizes := [...]string{"small", "medium", "large"}
dimensions := [...]dimension{{261, 142}, {358, 194}, {748, 408}}
// We will save the Thumbnails just if the original image
// dimension is bigger or equals than the thumbnail dimension
// to large thumbnail images
for index, size := range sizes {
newWidth := dimensions[index].Width
newHeight := dimensions[index].Height
widthRatio := float32(originalWidht) / float32(newWidth) // Width ratio
heightRatio := float32(originalHeight) / float32(newHeight) // Height ratio
log.Printf("Trying to save img size %d, widthRatio: %f, heightRatio: %f\n", size, widthRatio, heightRatio)
// We will resize and crop images small and medium and
// just images bigger than large size will be saved with large scale
if size == "small" || (widthRatio >= 1 && heightRatio >= 1) {
maxSize = size
// Below the values to the image be resized after be cropped
// If resized width or height == 0, so the proportion will be conserved
resizedWidth := 0 // Width to image be resized
resizedHeight := 0 // Height to image be resized
if widthRatio >= heightRatio {
// We will resize based on height and crop it after resized
resizedHeight = newHeight
} else {
// We will resize besed on height and crop it after resized
resizedWidth = newWidth
}
fo, err := os.Create("public/img/" + imageId + "-" + size + ".png")
if err != nil {
return nil, err
}
// close fo on exit and check for its returned error
defer func() {
if err := fo.Close(); err != nil {
panic(err)
}
}()
// If the image is bigger in both directions
if widthRatio >= 1 && heightRatio >= 1 {
// Downscales an image preserving its aspect ratio to the maximum dimensions
resizedImage := resize.Resize(uint(resizedWidth), uint(resizedHeight), originalImg, resize.Lanczos3)
// If image still bigger, lets crop it to the right size
croppedImg, err := cutter.Crop(resizedImage, cutter.Config{
Width: newWidth,
Height: newHeight,
Mode: cutter.Centered,
})
if err != nil {
return nil, err
}
png.Encode(fo, croppedImg)
} else {
// If the image isn't bigger in both directions
// We will enter here just if its the small/medium size image
if originalHeight < newHeight {
// If this image isn't taller enought
newHeight = originalHeight
}
if originalWidht < newWidth {
// If this image isn't large enought
newWidth = originalWidht
}
// If image still bigger, lets crop it to the right size
croppedImg, err := cutter.Crop(originalImg, cutter.Config{
Width: newWidth,
Height: newHeight,
Mode: cutter.Centered,
})
if err != nil {
return nil, err
}
png.Encode(fo, croppedImg)
}
log.Printf("Saving the image size %s\n", size)
}
}
if maxSize == "" {
// There is no image saved, cause the original image is so small
return nil, nil
}
image := &Image{
ImageId: imageId,
MaxSize: maxSize,
Creation: time.Now(),
Deleted: false,
}
err = db.Insert(image)
if err != nil {
return nil, err
}
return image, nil
}
// generate one thumbnail
func generateThumbnail(image_file string, overwrite bool) error {
var err error
if IsDirectory(thumbs_path) {
source_image := folder_path + "/" + image_file
mime, err := getContentType(source_image)
if err != nil {
return err
}
for thumb_folder, thumb_size := range thumb_sizes {
thumb_folder_path := thumbs_path + "/" + thumb_folder
if !Exists(thumb_folder_path) {
log.Println("Creating folder" + thumb_folder_path)
err := os.Mkdir(thumb_folder_path, 0755)
if err != nil {
return err
}
}
if IsDirectory(thumb_folder_path) {
thumb_file_path := thumb_folder_path + "/" + image_file
width, height, exact_size, err := parseSize(thumb_size)
if err != nil {
return err
}
if Exists(thumb_file_path) && overwrite == false {
log.Printf("Nothing to do, thumb %s already exists\n", thumb_file_path)
} else {
var img image.Image
file, err := os.Open(source_image)
if err != nil {
return err
}
if mime == "image/jpeg" {
img, err = jpeg.Decode(file)
if err != nil {
return err
}
} else if mime == "image/gif" {
img, err = gif.Decode(file)
if err != nil {
return err
}
} else if mime == "image/png" {
img, err = png.Decode(file)
if err != nil {
return err
}
}
file.Close()
var resized_image image.Image
if exact_size {
img_width, img_height, err := getImageDimensions(source_image)
if err != nil {
return err
}
img_ratio := float64(img_width) / float64(img_height)
thumb_ratio := float64(width) / float64(height)
resize_width := uint(width)
resize_height := uint(height)
if img_ratio > thumb_ratio {
resize_width = uint(img_width * 5)
} else {
resize_height = uint(img_height * 5)
}
image := resize.Thumbnail(resize_width, resize_height, img, resize.Lanczos3)
resized_image, err = cutter.Crop(image, cutter.Config{
Width: width,
Height: height,
})
if err != nil {
return err
}
} else {
resized_image = resize.Thumbnail(uint(width), uint(height), img, resize.Lanczos3)
}
out, err := os.Create(thumb_file_path)
if err != nil {
return err
}
defer out.Close()
if mime == "image/jpeg" {
var jpeg_opt jpeg.Options
jpeg_opt.Quality = viper.GetInt("jpeg_quality")
jpeg.Encode(out, resized_image, &jpeg_opt)
} else if mime == "image/gif" {
var gif_opt gif.Options
gif_opt.NumColors = 256
gif.Encode(out, resized_image, &gif_opt)
} else if mime == "image/png" {
png.Encode(out, resized_image)
}
}
} else {
return errors.New("Can't create thumbnails. " + thumb_folder_path + " must be a directory")
}
}
} else {
return errors.New("Thumbs folder doesn't exist or is not a Folder")
}
return err
}
func resize_picture(filename, output_folder string) {
file_temp := strings.Split(filename, "/")
img_name := file_temp[len(file_temp)-1]
output_file := output_folder + img_name
output_thumb := output_folder + strings.Split(img_name, ".")[0] + "_thumb.jpg"
file, err := os.Open(filename)
if err != nil {
log.Fatal(err)
}
img, err := jpeg.Decode(file)
if err != nil {
log.Fatal(err)
}
file.Close()
b := img.Bounds()
imgWidth := b.Max.X
imgHeight := b.Max.Y
if imgWidth > 1000 {
// resize to width 1000 using Lanczos resampling
// and preserve aspect ratio
m := resize.Resize(1000, 0, img, resize.Lanczos3)
out, err := os.Create(output_file)
if err != nil {
log.Fatal(err)
}
defer out.Close()
jpeg.Encode(out, m, nil)
}
// Create the thumbnails
n := img
switch {
case imgHeight <= 275:
n, err = cutter.Crop(img, cutter.Config{
Width: 350,
Height: 275,
Mode: cutter.Centered,
})
default:
tempn := resize.Resize(350, 0, img, resize.Lanczos3)
n, err = cutter.Crop(tempn, cutter.Config{
Width: 350,
Height: 275,
Mode: cutter.Centered,
})
}
out2, err := os.Create(output_thumb)
if err != nil {
log.Fatal(err)
}
defer out2.Close()
// write resized image and thumbnails to file
jpeg.Encode(out2, n, nil)
}
func (m *markedImage) Transform(crop image.Rectangle, width, height uint, dontenlarge bool, format string, resample resize.InterpolationFunction) (Image, error) {
novaFoto, err := m.Copy()
if err != nil {
return nil, e.Forward(err)
}
img, err := novaFoto.Image()
if err != nil {
return nil, e.Forward(err)
}
if width > math.MaxInt32 {
return nil, e.New("width is big")
}
if height > math.MaxInt32 {
return nil, e.New("height is big")
}
bounds, err := m.Bounds()
if err != nil {
return nil, e.Forward(err)
}
w := bounds.Dx()
h := bounds.Dy()
f, err := m.Format()
if err != nil {
return nil, e.Forward(err)
}
if crop.Empty() && ((width == 0 && height == 0) || (int(width) == w && int(height) == h)) && (format == "" || format == f) {
return novaFoto, nil
}
if !crop.Empty() {
sub, ok := img.(SubImager)
if !ok {
return nil, e.New("this image type don't support cropping")
}
img = sub.SubImage(crop)
}
imgResized := img
if !(width == 0 && height == 0) {
rect := img.Bounds()
w := uint(rect.Max.X - rect.Min.X)
h := uint(rect.Max.Y - rect.Min.Y)
imgRatio := img
if width > 0 && height > 0 {
ratio := round.RoundDec32(float32(w)/float32(h), 1)
newRatio := round.RoundDec32(float32(width)/float32(height), 1)
if ratio != newRatio {
//TODO: se imagem tem largura menor que 10px não vai funcionar
imgRatio, err = cutter.Crop(img, cutter.Config{
Width: int(newRatio * 10.0),
Height: 10,
Mode: cutter.Centered,
Options: cutter.Ratio,
})
if err != nil {
return nil, e.Push(err, "can't crop the image")
}
rect = imgRatio.Bounds()
w = uint(rect.Max.X - rect.Min.X)
h = uint(rect.Max.Y - rect.Min.Y)
}
}
imgResized = imgRatio
if (width >= w || height >= h) && !dontenlarge {
imgResized = resize.Resize(width, height, imgRatio, resample)
} else if width < w && height < h {
imgResized = resize.Resize(width, height, imgRatio, resample)
}
}
// rect := imgResized.Bounds()
// novaFoto.Width_ = rect.Max.X - rect.Min.X
// novaFoto.Height_ = rect.Max.Y - rect.Min.Y
b := make([]byte, 0, 1024*1024*5)
buf := bytes.NewBuffer(b)
// if format == "" {
// format = novaFoto.Mime_
// }
switch format {
// case "image/bmp", "image/x-windows-bmp":
// err := bmp.Encode(buf, imgResized)
// if err != nil {
// return nil, e.Forward(err)
// }
// novaFoto.Format_ = "bmp"
// case "image/gif":
// opt := &gif.Options{
// NumColors: 256,
// }
// err := gif.Encode(buf, imgResized, opt)
// if err != nil {
// return nil, e.Forward(err)
// }
// novaFoto.Format_ = "gif"
case "image/jpeg":
opt := &jpeg.Options{
Quality: Quality,
}
err := jpeg.Encode(buf, imgResized, opt)
if err != nil {
return nil, e.Forward(err)
}
//novaFoto.Format_ = "jpeg"
// case "image/png":
// err := png.Encode(buf, imgResized)
// if err != nil {
// return nil, e.Forward(err)
// }
// novaFoto.Format_ = "png"
// case "image/tiff", "image/x-tiff":
// opt := &tiff.Options{
// Compression: tiff.Deflate,
// Predictor: true,
// }
// err := tiff.Encode(buf, imgResized, opt)
// if err != nil {
// return nil, e.Forward(err)
// }
// novaFoto.Format_ = "tiff"
default:
return nil, e.New("image format isn't supported")
}
// novaFoto.Mime_ = format
// novaFoto.FileSize_ = int64(buf.Len())
// novaFoto.Data = buf.Bytes()
return novaFoto, nil
}