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Render heatmaps on scene thumbnails in DeoVR (#464)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| package server | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "image" | ||
| "image/draw" | ||
| "image/jpeg" | ||
| "image/png" | ||
| "io" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "net/url" | ||
| "os" | ||
| "path/filepath" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/disintegration/imaging" | ||
| "github.com/xbapps/xbvr/pkg/common" | ||
| "github.com/xbapps/xbvr/pkg/models" | ||
| "willnorris.com/go/imageproxy" | ||
| ) | ||
|
|
||
| const thumbnailWidth = 700 | ||
| const thumbnailHeight = 420 | ||
| const heatmapHeight = 10 | ||
| const heatmapMargin = 3 | ||
|
|
||
| type BufferResponseWriter struct { | ||
| header http.Header | ||
| statusCode int | ||
| buf *bytes.Buffer | ||
| } | ||
|
|
||
| func (myrw *BufferResponseWriter) Write(p []byte) (int, error) { | ||
| return myrw.buf.Write(p) | ||
| } | ||
|
|
||
| func (w *BufferResponseWriter) Header() http.Header { | ||
| return w.header | ||
| } | ||
|
|
||
| func (w *BufferResponseWriter) WriteHeader(statusCode int) { | ||
| w.statusCode = statusCode | ||
| } | ||
|
|
||
| type HeatmapThumbnailProxy struct { | ||
| ImageProxy *imageproxy.Proxy | ||
| Cache imageproxy.Cache | ||
| } | ||
|
|
||
| func NewHeatmapThumbnailProxy(imageproxy *imageproxy.Proxy, cache imageproxy.Cache) *HeatmapThumbnailProxy { | ||
| proxy := &HeatmapThumbnailProxy{ | ||
| ImageProxy: imageproxy, | ||
| Cache: cache, | ||
| } | ||
| return proxy | ||
| } | ||
|
|
||
| func getScriptFileId(urlpart string) (uint, error) { | ||
| sceneId, err := strconv.Atoi(urlpart) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
|
|
||
| var scene models.Scene | ||
| err = scene.GetIfExistByPK(uint(sceneId)) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| scriptfiles, err := scene.GetScriptFiles() | ||
| if err != nil || len(scriptfiles) < 1 { | ||
| return 0, fmt.Errorf("scene %d has no script files", sceneId) | ||
| } | ||
| return scriptfiles[0].ID, nil | ||
| } | ||
|
|
||
| func getHeatmapImageForScene(fileId uint) (image.Image, error) { | ||
|
|
||
| heatmapFilename := filepath.Join(common.ScriptHeatmapDir, fmt.Sprintf("heatmap-%d.png", fileId)) | ||
| heatmapFile, err := os.Open(heatmapFilename) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| heatmapImage, err := png.Decode(heatmapFile) | ||
| heatmapFile.Close() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return heatmapImage, nil | ||
| } | ||
|
|
||
| func createHeatmapThumbnail(out *bytes.Buffer, r io.Reader, heatmapImage image.Image) error { | ||
| thumbnailImage, err := jpeg.Decode(r) | ||
|
|
||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| rect := thumbnailImage.Bounds() | ||
| if rect.Dx() != thumbnailWidth || rect.Dy() != thumbnailHeight-heatmapHeight-heatmapMargin { | ||
| thumbnailImage = imaging.Fill(thumbnailImage, thumbnailWidth, thumbnailHeight-heatmapHeight-heatmapMargin, imaging.Center, imaging.Linear) | ||
| } | ||
| heatmapImage = imaging.Resize(heatmapImage, thumbnailWidth, heatmapHeight, imaging.Linear) | ||
|
|
||
| canvas := image.NewNRGBA(image.Rect(0, 0, thumbnailWidth, thumbnailHeight)) | ||
|
|
||
| drawRect := image.Rect(0, 0, thumbnailWidth, thumbnailHeight-heatmapHeight-heatmapMargin) | ||
| draw.Draw(canvas, drawRect, thumbnailImage, image.Point{}, draw.Over) | ||
| drawRect = image.Rect(0, thumbnailHeight-heatmapHeight, thumbnailWidth, thumbnailHeight) | ||
| draw.Draw(canvas, drawRect, heatmapImage, image.Point{}, draw.Over) | ||
| jpeg.Encode(out, canvas, &jpeg.Options{Quality: 90}) | ||
| return nil | ||
| } | ||
|
|
||
| func (p *HeatmapThumbnailProxy) serveImageproxyResponse(w http.ResponseWriter, r *http.Request, imageURL string) { | ||
| proxyURL := "/700x/" + imageURL | ||
| r2 := new(http.Request) | ||
| *r2 = *r | ||
| r2.URL = new(url.URL) | ||
| *r2.URL = *r.URL | ||
| r2.URL.Path = proxyURL | ||
| p.ImageProxy.ServeHTTP(w, r2) | ||
| } | ||
|
|
||
| func (p *HeatmapThumbnailProxy) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
|
|
||
| parts := strings.SplitN(r.URL.Path, "/", 3) | ||
| if len(parts) != 3 { | ||
| http.NotFound(w, r) | ||
| return | ||
| } | ||
|
|
||
| imageURL := parts[2] | ||
| fileId, err := getScriptFileId(parts[1]) | ||
| if err != nil { | ||
| p.serveImageproxyResponse(w, r, imageURL) | ||
| return | ||
| } | ||
|
|
||
| cacheKey := fmt.Sprintf("%d:%s", fileId, imageURL) | ||
| cachedContent, ok := p.Cache.Get(cacheKey) | ||
| if ok { | ||
| w.Header().Add("Content-Type", "image/jpeg") | ||
| w.Header().Add("Content-Length", fmt.Sprint(len(cachedContent))) | ||
| if _, err := io.Copy(w, bytes.NewReader(cachedContent)); err != nil { | ||
| log.Printf("Failed to send out response: %v", err) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| heatmapImage, err := getHeatmapImageForScene(fileId) | ||
| if err != nil { | ||
| p.serveImageproxyResponse(w, r, imageURL) | ||
| return | ||
| } | ||
|
|
||
| proxyURL := fmt.Sprintf("/%dx%d,jpeg/%s", thumbnailWidth, thumbnailHeight-heatmapHeight-heatmapMargin, imageURL) | ||
| r2 := new(http.Request) | ||
| *r2 = *r | ||
| r2.URL = new(url.URL) | ||
| *r2.URL = *r.URL | ||
| r2.URL.Path = proxyURL | ||
| imageproxyResponseWriter := &BufferResponseWriter{ | ||
| header: http.Header{}, | ||
| buf: &bytes.Buffer{}, | ||
| } | ||
| p.ImageProxy.ServeHTTP(imageproxyResponseWriter, r2) | ||
|
|
||
| respbody, err := ioutil.ReadAll(imageproxyResponseWriter.buf) | ||
| if err == nil { | ||
| var output bytes.Buffer | ||
| err = createHeatmapThumbnail(&output, bytes.NewReader(respbody), heatmapImage) | ||
| if err == nil { | ||
| p.Cache.Set(cacheKey, output.Bytes()) | ||
| w.Header().Add("Content-Type", "image/jpeg") | ||
| w.Header().Add("Content-Length", fmt.Sprint(len(output.Bytes()))) | ||
| if _, err := io.Copy(w, bytes.NewReader(output.Bytes())); err != nil { | ||
| log.Printf("Failed to send out response: %v", err) | ||
| } | ||
| return | ||
| } | ||
| } | ||
| if err != nil { | ||
| log.Printf("%v", err) | ||
| // serve original response | ||
| if _, err := io.Copy(w, bytes.NewReader(respbody)); err != nil { | ||
| log.Printf("Failed to send out response: %v", err) | ||
| } | ||
| } | ||
| } |
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