Example #1
0
func upload(resp http.ResponseWriter, req *http.Request) {
	ctx := appengine.NewContext(req)

	var arch multipart.File

	if f, _, err := req.FormFile("zip"); err == nil {
		arch = f
	} else {
		ctx.Errorf("%s", err.Error())
		http.Error(resp, "No zip file has been submitted.", http.StatusInternalServerError)
		return
	}

	var fileSize int64

	if sz, err := arch.Seek(0, 2); err == nil {
		fileSize = sz
	} else {
		ctx.Errorf("%s", err.Error())
		http.Error(resp, "Server error", http.StatusInternalServerError)
		return
	}

	var images []loading.Image
	var loadingErrors []loading.Error

	if r, err := zip.NewReader(arch, fileSize); err == nil {
		images, loadingErrors = loading.LoadImagesFromZip(r)
	} else {
		ctx.Errorf("%s", err.Error())
		http.Error(resp, "The file submitted is not a valid zip archive.", http.StatusInternalServerError)
		return
	}

	rects := make([]image.Rectangle, len(images))

	for i := 0; i < len(rects); i++ {
		rects[i] = images[i].Data.Bounds()
	}

	union := impack.Arrange(rects)
	dest := image.NewNRGBA(image.Rect(0, 0, union.Dx(), union.Dy()))

	for i := 0; i < len(rects); i++ {
		draw.Draw(dest, rects[i], images[i].Data, image.Pt(0, 0), draw.Src)
	}

	spriteInfo := &SpriteInfo{Timestamp: time.Now()}

	if k, err := saveBlob(ctx, "image/png", func(w *blobstore.Writer) error { return png.Encode(w, dest) }); err == nil {
		ctx.Infof("Image saved with key %s.", k)
		spriteInfo.ImageId = k
	} else {
		ctx.Errorf("%s", err.Error())
		http.Error(resp, "Server error", http.StatusInternalServerError)
		return
	}

	if k, err := saveBlob(ctx, "text/css", func(w *blobstore.Writer) error { return generateCss(w, spriteInfo.ImageId, rects, images) }); err == nil {
		ctx.Infof("CSS saved with key %s.", k)
		spriteInfo.CssId = k
	} else {
		ctx.Errorf("%s", err.Error())
		http.Error(resp, "Server error", http.StatusInternalServerError)
		return
	}

	if _, err := datastore.Put(ctx, datastore.NewIncompleteKey(ctx, "SpriteInfo", nil), spriteInfo); err != nil {
		ctx.Errorf("%s", err.Error())
		http.Error(resp, "Server error", http.StatusInternalServerError)
		return
	}

	if t, err := template.ParseFiles("result.html"); err == nil {
		classes := make([]string, len(rects))
		for i := 0; i < len(classes); i++ {
			classes[i] = fmt.Sprintf("cls%d", i+1)
		}

		spriteView := &SpriteView{Sprite: *spriteInfo, Classes: classes, Errors: loadingErrors}

		if err = t.Execute(resp, spriteView); err != nil {
			ctx.Errorf("%s", err.Error())
			http.Error(resp, "Server error", http.StatusInternalServerError)
			return
		}
	} else {
		ctx.Errorf("%s", err.Error())
		http.Error(resp, "Server error", http.StatusInternalServerError)
		return
	}
}
Example #2
0
func main() {
	flag.Parse()

	var images []loading.Image
	var loadingErrors []loading.Error

	if len(*archiveFileName) == 0 {
		var pathChan chan string

		if len(*imageDirName) > 0 {
			if pch, err := getImagePaths(*imageDirName); err == nil {
				pathChan = pch
			} else {
				fmt.Errorf("%s\n", err.Error())
				return
			}
		} else {
			pathChan = make(chan string, 10)
			go func() {
				var line string
				for _, err := fmt.Scan(&line); err == nil; _, err = fmt.Scan(&line) {
					pathChan <- line
				}

				pathChan <- ""
			}()
		}

		images, loadingErrors = loading.LoadImages(pathChan)
	} else {
		var reader *zip.ReadCloser

		if r, err := zip.OpenReader(*archiveFileName); err == nil {
			reader = r
		} else {
			fmt.Printf("%s\n", err)
			return
		}

		images, loadingErrors = loading.LoadImagesFromZip(&reader.Reader)
		reader.Close()
	}

	for _, r := range loadingErrors {
		fmt.Errorf("Loading of %s failed:\n  %s\n", r.Name, r.Message)
	}

	rects := make([]image.Rectangle, len(images))

	for i := 0; i < len(rects); i++ {
		rects[i] = images[i].Data.Bounds()
	}

	union := impack.Arrange(rects)

	dest := image.NewNRGBA(image.Rect(0, 0, union.Dx(), union.Dy()))

	for i := 0; i < len(rects); i++ {
		draw.Draw(dest, rects[i], images[i].Data, image.Pt(0, 0), draw.Src)
	}

	var out io.Writer

	if len(*outputFileName) > 0 {
		if f, err := os.Create(*outputFileName); err == nil {
			out = f
		} else {
			fmt.Errorf("%s\n", err)
			return
		}
	} else {
		out = os.Stdout
	}

	png.Encode(out, dest)
}