Add m-esr52 at 52.6.0

1 files changed, 304 insertions, 0 deletions

diff --git a/dom/canvas/CanvasRenderingContextHelper.cpp b/dom/canvas/CanvasRenderingContextHelper.cpp
new file mode 100644
index 000000000..3000e59bd
--- /dev/null
+++ b/dom/canvas/CanvasRenderingContextHelper.cpp
@@ -0,0 +1,304 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "CanvasRenderingContextHelper.h"
+#include "ImageBitmapRenderingContext.h"
+#include "ImageEncoder.h"
+#include "mozilla/dom/CanvasRenderingContext2D.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/UniquePtr.h"
+#include "nsContentUtils.h"
+#include "nsDOMJSUtils.h"
+#include "nsIScriptContext.h"
+#include "nsJSUtils.h"
+#include "WebGL1Context.h"
+#include "WebGL2Context.h"
+
+namespace mozilla {
+namespace dom {
+
+void
+CanvasRenderingContextHelper::ToBlob(JSContext* aCx,
+                                     nsIGlobalObject* aGlobal,
+                                     BlobCallback& aCallback,
+                                     const nsAString& aType,
+                                     JS::Handle<JS::Value> aParams,
+                                     ErrorResult& aRv)
+{
+  // Encoder callback when encoding is complete.
+  class EncodeCallback : public EncodeCompleteCallback
+  {
+  public:
+    EncodeCallback(nsIGlobalObject* aGlobal, BlobCallback* aCallback)
+      : mGlobal(aGlobal)
+      , mBlobCallback(aCallback) {}
+
+    // This is called on main thread.
+    nsresult ReceiveBlob(already_AddRefed<Blob> aBlob)
+    {
+      RefPtr<Blob> blob = aBlob;
+
+      ErrorResult rv;
+      uint64_t size = blob->GetSize(rv);
+      if (rv.Failed()) {
+        rv.SuppressException();
+      } else {
+        AutoJSAPI jsapi;
+        if (jsapi.Init(mGlobal)) {
+          JS_updateMallocCounter(jsapi.cx(), size);
+        }
+      }
+
+      RefPtr<Blob> newBlob = Blob::Create(mGlobal, blob->Impl());
+
+      mBlobCallback->Call(*newBlob, rv);
+
+      mGlobal = nullptr;
+      mBlobCallback = nullptr;
+
+      return rv.StealNSResult();
+    }
+
+    nsCOMPtr<nsIGlobalObject> mGlobal;
+    RefPtr<BlobCallback> mBlobCallback;
+  };
+
+  RefPtr<EncodeCompleteCallback> callback =
+    new EncodeCallback(aGlobal, &aCallback);
+
+  ToBlob(aCx, aGlobal, callback, aType, aParams, aRv);
+}
+
+void
+CanvasRenderingContextHelper::ToBlob(JSContext* aCx,
+                                     nsIGlobalObject* aGlobal,
+                                     EncodeCompleteCallback* aCallback,
+                                     const nsAString& aType,
+                                     JS::Handle<JS::Value> aParams,
+                                     ErrorResult& aRv)
+{
+  nsAutoString type;
+  nsContentUtils::ASCIIToLower(aType, type);
+
+  nsAutoString params;
+  bool usingCustomParseOptions;
+  aRv = ParseParams(aCx, type, aParams, params, &usingCustomParseOptions);
+  if (aRv.Failed()) {
+    return;
+  }
+
+  if (mCurrentContext) {
+    // We disallow canvases of width or height zero, and set them to 1, so
+    // we will have a discrepancy with the sizes of the canvas and the context.
+    // That discrepancy is OK, the rest are not.
+    nsIntSize elementSize = GetWidthHeight();
+    if ((elementSize.width != mCurrentContext->GetWidth() &&
+         (elementSize.width != 0 || mCurrentContext->GetWidth() != 1)) ||
+        (elementSize.height != mCurrentContext->GetHeight() &&
+         (elementSize.height != 0 || mCurrentContext->GetHeight() != 1))) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+  }
+
+  UniquePtr<uint8_t[]> imageBuffer;
+  int32_t format = 0;
+  if (mCurrentContext) {
+    imageBuffer = mCurrentContext->GetImageBuffer(&format);
+  }
+
+  RefPtr<EncodeCompleteCallback> callback = aCallback;
+
+  aRv = ImageEncoder::ExtractDataAsync(type,
+                                       params,
+                                       usingCustomParseOptions,
+                                       Move(imageBuffer),
+                                       format,
+                                       GetWidthHeight(),
+                                       callback);
+}
+
+already_AddRefed<nsICanvasRenderingContextInternal>
+CanvasRenderingContextHelper::CreateContext(CanvasContextType aContextType)
+{
+  return CreateContextHelper(aContextType, layers::LayersBackend::LAYERS_NONE);
+}
+
+already_AddRefed<nsICanvasRenderingContextInternal>
+CanvasRenderingContextHelper::CreateContextHelper(CanvasContextType aContextType,
+                                                  layers::LayersBackend aCompositorBackend)
+{
+  MOZ_ASSERT(aContextType != CanvasContextType::NoContext);
+  RefPtr<nsICanvasRenderingContextInternal> ret;
+
+  switch (aContextType) {
+  case CanvasContextType::NoContext:
+    break;
+
+  case CanvasContextType::Canvas2D:
+    Telemetry::Accumulate(Telemetry::CANVAS_2D_USED, 1);
+    ret = new CanvasRenderingContext2D(aCompositorBackend);
+    break;
+
+  case CanvasContextType::WebGL1:
+    Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_USED, 1);
+
+    ret = WebGL1Context::Create();
+    if (!ret)
+      return nullptr;
+
+    break;
+
+  case CanvasContextType::WebGL2:
+    Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_USED, 1);
+
+    ret = WebGL2Context::Create();
+    if (!ret)
+      return nullptr;
+
+    break;
+
+  case CanvasContextType::ImageBitmap:
+    ret = new ImageBitmapRenderingContext();
+
+    break;
+  }
+  MOZ_ASSERT(ret);
+
+  return ret.forget();
+}
+
+already_AddRefed<nsISupports>
+CanvasRenderingContextHelper::GetContext(JSContext* aCx,
+                                         const nsAString& aContextId,
+                                         JS::Handle<JS::Value> aContextOptions,
+                                         ErrorResult& aRv)
+{
+  CanvasContextType contextType;
+  if (!CanvasUtils::GetCanvasContextType(aContextId, &contextType))
+    return nullptr;
+
+  if (!mCurrentContext) {
+    // This canvas doesn't have a context yet.
+    RefPtr<nsICanvasRenderingContextInternal> context;
+    context = CreateContext(contextType);
+    if (!context) {
+      return nullptr;
+    }
+
+    // Ensure that the context participates in CC.  Note that returning a
+    // CC participant from QI doesn't addref.
+    nsXPCOMCycleCollectionParticipant* cp = nullptr;
+    CallQueryInterface(context, &cp);
+    if (!cp) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return nullptr;
+    }
+
+    mCurrentContext = context.forget();
+    mCurrentContextType = contextType;
+
+    nsresult rv = UpdateContext(aCx, aContextOptions, aRv);
+    if (NS_FAILED(rv)) {
+      // See bug 645792 and bug 1215072.
+      // We want to throw only if dictionary initialization fails,
+      // so only in case aRv has been set to some error value.
+      if (contextType == CanvasContextType::WebGL1)
+        Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_SUCCESS, 0);
+      else if (contextType == CanvasContextType::WebGL2)
+        Telemetry::Accumulate(Telemetry::CANVAS_WEBGL2_SUCCESS, 0);
+      return nullptr;
+    }
+    if (contextType == CanvasContextType::WebGL1)
+      Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_SUCCESS, 1);
+    else if (contextType == CanvasContextType::WebGL2)
+      Telemetry::Accumulate(Telemetry::CANVAS_WEBGL2_SUCCESS, 1);
+  } else {
+    // We already have a context of some type.
+    if (contextType != mCurrentContextType)
+      return nullptr;
+  }
+
+  nsCOMPtr<nsICanvasRenderingContextInternal> context = mCurrentContext;
+  return context.forget();
+}
+
+nsresult
+CanvasRenderingContextHelper::UpdateContext(JSContext* aCx,
+                                            JS::Handle<JS::Value> aNewContextOptions,
+                                            ErrorResult& aRvForDictionaryInit)
+{
+  if (!mCurrentContext)
+    return NS_OK;
+
+  nsIntSize sz = GetWidthHeight();
+
+  nsCOMPtr<nsICanvasRenderingContextInternal> currentContext = mCurrentContext;
+
+  nsresult rv = currentContext->SetIsOpaque(GetOpaqueAttr());
+  if (NS_FAILED(rv)) {
+    mCurrentContext = nullptr;
+    return rv;
+  }
+
+  rv = currentContext->SetContextOptions(aCx, aNewContextOptions,
+                                         aRvForDictionaryInit);
+  if (NS_FAILED(rv)) {
+    mCurrentContext = nullptr;
+    return rv;
+  }
+
+  rv = currentContext->SetDimensions(sz.width, sz.height);
+  if (NS_FAILED(rv)) {
+    mCurrentContext = nullptr;
+  }
+
+  return rv;
+}
+
+nsresult
+CanvasRenderingContextHelper::ParseParams(JSContext* aCx,
+                                          const nsAString& aType,
+                                          const JS::Value& aEncoderOptions,
+                                          nsAString& outParams,
+                                          bool* const outUsingCustomParseOptions)
+{
+  // Quality parameter is only valid for the image/jpeg MIME type
+  if (aType.EqualsLiteral("image/jpeg")) {
+    if (aEncoderOptions.isNumber()) {
+      double quality = aEncoderOptions.toNumber();
+      // Quality must be between 0.0 and 1.0, inclusive
+      if (quality >= 0.0 && quality <= 1.0) {
+        outParams.AppendLiteral("quality=");
+        outParams.AppendInt(NS_lround(quality * 100.0));
+      }
+    }
+  }
+
+  // If we haven't parsed the aParams check for proprietary options.
+  // The proprietary option -moz-parse-options will take a image lib encoder
+  // parse options string as is and pass it to the encoder.
+  *outUsingCustomParseOptions = false;
+  if (outParams.Length() == 0 && aEncoderOptions.isString()) {
+    NS_NAMED_LITERAL_STRING(mozParseOptions, "-moz-parse-options:");
+    nsAutoJSString paramString;
+    if (!paramString.init(aCx, aEncoderOptions.toString())) {
+      return NS_ERROR_FAILURE;
+    }
+    if (StringBeginsWith(paramString, mozParseOptions)) {
+      nsDependentSubstring parseOptions = Substring(paramString,
+                                                    mozParseOptions.Length(),
+                                                    paramString.Length() -
+                                                    mozParseOptions.Length());
+      outParams.Append(parseOptions);
+      *outUsingCustomParseOptions = true;
+    }
+  }
+
+  return NS_OK;
+}
+
+} // namespace dom
+} // namespace mozilla