ShapeDetection: Eliminate DetectorType enum in ShapeDetector.cpp

third_party/WebKit/Source/modules/shapedetection/ShapeDetector.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/shapedetection/ShapeDetector.h"
 
 #include "core/dom/DOMException.h"
 #include "core/dom/DOMRect.h"
 #include "core/dom/Document.h"
 #include "core/fetch/ImageResource.h"
 #include "core/frame/ImageBitmap.h"
-#include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/canvas/CanvasImageSource.h"
-#include "modules/shapedetection/DetectedBarcode.h"
 #include "platform/graphics/Image.h"
-#include "public/platform/InterfaceProvider.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkImageInfo.h"
 #include "wtf/CheckedNumeric.h"
 
 namespace blink {
 
 namespace {
 
 static CanvasImageSource* toImageSourceInternal(
     const CanvasImageSourceUnion& value) {
   if (value.isHTMLImageElement())
     return value.getAsHTMLImageElement();
 
   if (value.isImageBitmap() &&
       !static_cast<ImageBitmap*>(value.getAsImageBitmap())->isNeutered()) {
     return value.getAsImageBitmap();
   }
 
   if (value.isHTMLVideoElement())
     return value.getAsHTMLVideoElement();
 
   return nullptr;
 }
 
 }  // anonymous namespace
 
 ShapeDetector::ShapeDetector(LocalFrame& frame) {
-  DCHECK(!m_faceService.is_bound());
-  DCHECK(!m_barcodeService.is_bound());
   DCHECK(frame.interfaceProvider());
-  frame.interfaceProvider()->getInterface(mojo::GetProxy(&m_faceService));
-  frame.interfaceProvider()->getInterface(mojo::GetProxy(&m_barcodeService));
-  m_faceService.set_connection_error_handler(convertToBaseCallback(WTF::bind(
-      &ShapeDetector::onFaceServiceConnectionError, wrapWeakPersistent(this))));
-  m_barcodeService.set_connection_error_handler(convertToBaseCallback(
-      WTF::bind(&ShapeDetector::onBarcodeServiceConnectionError,
-                wrapWeakPersistent(this))));
 }
 
-ShapeDetector::ShapeDetector(LocalFrame& frame,
-                             const FaceDetectorOptions& options)
-    : ShapeDetector(frame) {
-  m_faceDetectorOptions = mojom::blink::FaceDetectorOptions::New();
-  m_faceDetectorOptions->max_detected_faces = options.maxDetectedFaces();
-  m_faceDetectorOptions->fast_mode = options.fastMode();
+ScriptPromise ShapeDetector::detect(ScriptState* scriptState,
+                                    const CanvasImageSourceUnion& imageSource) {
+  ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
+  return detectShapes(scriptState, resolver, imageSource);
 }
 
 ScriptPromise ShapeDetector::detectShapes(
     ScriptState* scriptState,
-    DetectorType detectorType,
+    ScriptPromiseResolver* resolver,
     const CanvasImageSourceUnion& imageSource) {
+  ScriptPromise promise = resolver->promise();
   CanvasImageSource* imageSourceInternal = toImageSourceInternal(imageSource);
 
-  ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
-  ScriptPromise promise = resolver->promise();
-
   if (!imageSourceInternal) {
     // TODO(mcasas): Implement more CanvasImageSources, https://crbug.com/659138
     NOTIMPLEMENTED() << "Unsupported CanvasImageSource";
     resolver->reject(
         DOMException::create(NotFoundError, "Unsupported source."));
     return promise;
   }
 
   if (imageSourceInternal->wouldTaintOrigin(
           scriptState->getExecutionContext()->getSecurityOrigin())) {
     resolver->reject(
         DOMException::create(SecurityError, "Source would taint origin."));
     return promise;
   }
 
   if (imageSource.isHTMLImageElement()) {
     return detectShapesOnImageElement(
-        detectorType, resolver,
-        static_cast<HTMLImageElement*>(imageSourceInternal));
+        resolver, static_cast<HTMLImageElement*>(imageSourceInternal));

[Reilly Grant (use Gerrit), 2016/12/06 20:40:13]

It seems to me that since this set of if statements mirror
toImageSourceInternal()'s logic we could avoid these casts by just calling the
methods like imageSource.getAsHTMLImageElement() here.

[xianglu, 2016/12/06 22:31:56]

Removed duplicated logic. I think the only trade-off here is that since
wouldTaintOrigin() only works on an explicit canvas source, the elements need to
be checked separately in their detectShapesOn...().

   }
   if (imageSourceInternal->isImageBitmap()) {
     return detectShapesOnImageBitmap(
-        detectorType, resolver, static_cast<ImageBitmap*>(imageSourceInternal));
+        resolver, static_cast<ImageBitmap*>(imageSourceInternal));
   }
   if (imageSourceInternal->isVideoElement()) {
     return detectShapesOnVideoElement(
-        detectorType, resolver,
-        static_cast<HTMLVideoElement*>(imageSourceInternal));
+        resolver, static_cast<HTMLVideoElement*>(imageSourceInternal));
   }
 
   NOTREACHED();
   return promise;
 }
 
 ScriptPromise ShapeDetector::detectShapesOnImageElement(
-    DetectorType detectorType,
     ScriptPromiseResolver* resolver,
     const HTMLImageElement* img) {
   ScriptPromise promise = resolver->promise();
   if (img->bitmapSourceSize().isZero()) {
     resolver->resolve(HeapVector<Member<DOMRect>>());
     return promise;
   }
 
   ImageResource* const imageResource = img->cachedImage();
   if (!imageResource || imageResource->errorOccurred()) {
@@ skipping 41 matching lines @@
       sharedBufferHandle->Map(allocationSize);
 
   const SkPixmap pixmap(skiaInfo, mappedBuffer.get(), skiaInfo.minRowBytes());
   if (!image->readPixels(pixmap, 0, 0)) {
     resolver->reject(DOMException::create(
         InvalidStateError,
         "Failed to read pixels: Unable to decompress or unsupported format."));
     return promise;
   }
 
-  if (detectorType == DetectorType::Face) {
-    if (!m_faceService) {
-      resolver->reject(DOMException::create(
-          NotSupportedError, "Face detection service unavailable."));
-      return promise;
-    }
-    m_faceServiceRequests.add(resolver);
-    m_faceService->Detect(std::move(sharedBufferHandle), img->naturalWidth(),
-                          img->naturalHeight(), m_faceDetectorOptions.Clone(),
-                          convertToBaseCallback(WTF::bind(
-                              &ShapeDetector::onDetectFaces,
-                              wrapPersistent(this), wrapPersistent(resolver))));
-  } else if (detectorType == DetectorType::Barcode) {
-    if (!m_barcodeService) {
-      resolver->reject(DOMException::create(
-          NotSupportedError, "Barcode detection service unavailable."));
-      return promise;
-    }
-    m_barcodeServiceRequests.add(resolver);
-    m_barcodeService->Detect(
-        std::move(sharedBufferHandle), img->naturalWidth(),
-        img->naturalHeight(),
-        convertToBaseCallback(WTF::bind(&ShapeDetector::onDetectBarcodes,
-                                        wrapPersistent(this),
-                                        wrapPersistent(resolver))));
-  } else {
-    NOTREACHED() << "Unsupported detector type";
-  }
-
-  return promise;
+  return doDetect(resolver, std::move(sharedBufferHandle), img->naturalWidth(),
+                  img->naturalHeight());
 }
 
 ScriptPromise ShapeDetector::detectShapesOnImageBitmap(
-    DetectorType detectorType,
     ScriptPromiseResolver* resolver,
     ImageBitmap* imageBitmap) {
   ScriptPromise promise = resolver->promise();
   if (!imageBitmap->originClean()) {
     resolver->reject(
         DOMException::create(SecurityError, "ImageBitmap is not origin clean"));
     return promise;
   }
 
   if (imageBitmap->size().area() == 0) {
@@ skipping 13 matching lines @@
     allocationSize = pixmap.getSafeSize();
   } else {
     pixelData = imageBitmap->copyBitmapData(imageBitmap->isPremultiplied()
                                                 ? PremultiplyAlpha
                                                 : DontPremultiplyAlpha,
                                             N32ColorType);
     pixelDataPtr = pixelData->data();
     allocationSize = imageBitmap->size().area() * 4 /* bytes per pixel */;
   }
 
-  return detectShapesOnData(detectorType, resolver, pixelDataPtr,
-                            allocationSize.ValueOrDefault(0),
-                            imageBitmap->width(), imageBitmap->height());
+  int size = allocationSize.ValueOrDefault(0);
+  mojo::ScopedSharedBufferHandle sharedBufferHandle =
+      mojo::SharedBufferHandle::Create(size);
+  if (!sharedBufferHandle->is_valid()) {
+    resolver->reject(
+        DOMException::create(InvalidStateError, "Internal allocation error"));
+    return promise;
+  }
+
+  const mojo::ScopedSharedBufferMapping mappedBuffer =
+      sharedBufferHandle->Map(size);
+  DCHECK(mappedBuffer.get());
+  memcpy(mappedBuffer.get(), pixelDataPtr, size);
+
+  return doDetect(resolver, std::move(sharedBufferHandle), imageBitmap->width(),
+                  imageBitmap->height());
 }
 
 ScriptPromise ShapeDetector::detectShapesOnVideoElement(
-    DetectorType detectorType,
     ScriptPromiseResolver* resolver,
     const HTMLVideoElement* video) {
   ScriptPromise promise = resolver->promise();
-
   // TODO(mcasas): Check if |video| is actually playing a MediaStream by using
   // HTMLMediaElement::isMediaStreamURL(video->currentSrc().getString()); if
   // there is a local WebCam associated, there might be sophisticated ways to
   // detect faces on it. Until then, treat as a normal <video> element.
 
   // !hasAvailableVideoFrame() is a bundle of invalid states.
   if (!video->hasAvailableVideoFrame()) {
     resolver->reject(DOMException::create(
         InvalidStateError, "Invalid HTMLVideoElement or state."));
     return promise;
@@ skipping 17 matching lines @@
     pixelDataPtr = static_cast<uint8_t*>(pixmap.writable_addr());
     allocationSize = pixmap.getSafeSize();
   } else {
     // TODO(mcasas): retrieve the pixels from elsewhere.
     NOTREACHED();
     resolver->reject(DOMException::create(
         InvalidStateError, "Failed to get pixels for current frame."));
     return promise;
   }
 
-  return detectShapesOnData(detectorType, resolver, pixelDataPtr,
-                            allocationSize.ValueOrDefault(0), image->width(),
-                            image->height());
-}
-
-ScriptPromise ShapeDetector::detectShapesOnData(DetectorType detectorType,
-                                                ScriptPromiseResolver* resolver,
-                                                uint8_t* data,
-                                                int size,
-                                                int width,
-                                                int height) {
-  DCHECK(data);
-  DCHECK(size);
-  ScriptPromise promise = resolver->promise();
-
+  int size = allocationSize.ValueOrDefault(0);
   mojo::ScopedSharedBufferHandle sharedBufferHandle =
       mojo::SharedBufferHandle::Create(size);
   if (!sharedBufferHandle->is_valid()) {
     resolver->reject(
         DOMException::create(InvalidStateError, "Internal allocation error"));
     return promise;
   }
 
   const mojo::ScopedSharedBufferMapping mappedBuffer =
       sharedBufferHandle->Map(size);
   DCHECK(mappedBuffer.get());
+  memcpy(mappedBuffer.get(), pixelDataPtr, size);
 
-  memcpy(mappedBuffer.get(), data, size);
-
-  if (detectorType == DetectorType::Face) {
-    if (!m_faceService) {
-      resolver->reject(DOMException::create(
-          NotSupportedError, "Face detection service unavailable."));
-      return promise;
-    }
-    m_faceServiceRequests.add(resolver);
-    m_faceService->Detect(std::move(sharedBufferHandle), width, height,
-                          m_faceDetectorOptions.Clone(),
-                          convertToBaseCallback(WTF::bind(
-                              &ShapeDetector::onDetectFaces,
-                              wrapPersistent(this), wrapPersistent(resolver))));
-  } else if (detectorType == DetectorType::Barcode) {
-    if (!m_barcodeService) {
-      resolver->reject(DOMException::create(
-          NotSupportedError, "Barcode detection service unavailable."));
-      return promise;
-    }
-    m_barcodeServiceRequests.add(resolver);
-    m_barcodeService->Detect(
-        std::move(sharedBufferHandle), width, height,
-        convertToBaseCallback(WTF::bind(&ShapeDetector::onDetectBarcodes,
-                                        wrapPersistent(this),
-                                        wrapPersistent(resolver))));
-  } else {
-    NOTREACHED() << "Unsupported detector type";
-  }
-  sharedBufferHandle.reset();
-  return promise;
-}
-
-void ShapeDetector::onDetectFaces(
-    ScriptPromiseResolver* resolver,
-    mojom::blink::FaceDetectionResultPtr faceDetectionResult) {
-  DCHECK(m_faceServiceRequests.contains(resolver));
-  m_faceServiceRequests.remove(resolver);
-
-  HeapVector<Member<DOMRect>> detectedFaces;
-  for (const auto& boundingBox : faceDetectionResult->bounding_boxes) {
-    detectedFaces.append(DOMRect::create(boundingBox->x, boundingBox->y,
-                                         boundingBox->width,
-                                         boundingBox->height));
-  }
-
-  resolver->resolve(detectedFaces);
-}
-
-void ShapeDetector::onDetectBarcodes(
-    ScriptPromiseResolver* resolver,
-    Vector<mojom::blink::BarcodeDetectionResultPtr> barcodeDetectionResults) {
-  DCHECK(m_barcodeServiceRequests.contains(resolver));
-  m_barcodeServiceRequests.remove(resolver);
-
-  HeapVector<Member<DetectedBarcode>> detectedBarcodes;
-  for (const auto& barcode : barcodeDetectionResults) {
-    detectedBarcodes.append(DetectedBarcode::create(
-        barcode->raw_value,
-        DOMRect::create(barcode->bounding_box->x, barcode->bounding_box->y,
-                        barcode->bounding_box->width,
-                        barcode->bounding_box->height)));
-  }
-
-  resolver->resolve(detectedBarcodes);
-}
-
-void ShapeDetector::onFaceServiceConnectionError() {
-  for (const auto& request : m_faceServiceRequests) {
-    request->reject(DOMException::create(NotSupportedError,
-                                         "Face Detection not implemented."));
-  }
-  m_faceServiceRequests.clear();
-  m_faceService.reset();
-}
-
-void ShapeDetector::onBarcodeServiceConnectionError() {
-  for (const auto& request : m_barcodeServiceRequests) {
-    request->reject(DOMException::create(NotSupportedError,
-                                         "Barcode Detection not implemented."));
-  }
-  m_barcodeServiceRequests.clear();
-  m_barcodeService.reset();
-}
-
-DEFINE_TRACE(ShapeDetector) {
-  visitor->trace(m_faceServiceRequests);
-  visitor->trace(m_barcodeServiceRequests);
+  return doDetect(resolver, std::move(sharedBufferHandle), image->width(),
+                  image->height());
 }
 
 }  // namespace blink