1 files changed, 82 insertions, 0 deletions
diff --git a/layout/svg/SVGImageContext.cpp b/layout/svg/SVGImageContext.cpp
new file mode 100644
index 0000000000..3044ad0070
--- /dev/null
+++ b/layout/svg/SVGImageContext.cpp
@@ -0,0 +1,82 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+// Main header first:
+#include "SVGImageContext.h"
+
+// Keep others in (case-insensitive) order:
+#include "gfxUtils.h"
+#include "mozilla/Preferences.h"
+#include "nsIFrame.h"
+#include "nsPresContext.h"
+#include "nsStyleStruct.h"
+
+namespace mozilla {
+
+/* static */
+void SVGImageContext::MaybeStoreContextPaint(Maybe<SVGImageContext>& aContext,
+                                             nsIFrame* aFromFrame,
+                                             imgIContainer* aImgContainer) {
+  return MaybeStoreContextPaint(aContext, aFromFrame->Style(), aImgContainer);
+}
+
+/* static */
+void SVGImageContext::MaybeStoreContextPaint(Maybe<SVGImageContext>& aContext,
+                                             ComputedStyle* aFromComputedStyle,
+                                             imgIContainer* aImgContainer) {
+  const nsStyleSVG* style = aFromComputedStyle->StyleSVG();
+
+  if (!style->ExposesContextProperties()) {
+    // Content must have '-moz-context-properties' set to the names of the
+    // properties it wants to expose to images it links to.
+    return;
+  }
+
+  if (aImgContainer->GetType() != imgIContainer::TYPE_VECTOR) {
+    // Avoid this overhead for raster images.
+    return;
+  }
+
+  bool haveContextPaint = false;
+
+  auto contextPaint = MakeRefPtr<SVGEmbeddingContextPaint>();
+
+  if ((style->mMozContextProperties.bits & StyleContextPropertyBits::FILL) &&
+      style->mFill.kind.IsColor()) {
+    haveContextPaint = true;
+    contextPaint->SetFill(
+        style->mFill.kind.AsColor().CalcColor(*aFromComputedStyle));
+  }
+  if ((style->mMozContextProperties.bits & StyleContextPropertyBits::STROKE) &&
+      style->mStroke.kind.IsColor()) {
+    haveContextPaint = true;
+    contextPaint->SetStroke(
+        style->mStroke.kind.AsColor().CalcColor(*aFromComputedStyle));
+  }
+  if (style->mMozContextProperties.bits &
+      StyleContextPropertyBits::FILL_OPACITY) {
+    haveContextPaint = true;
+    contextPaint->SetFillOpacity(style->mFillOpacity.IsOpacity()
+                                     ? style->mFillOpacity.AsOpacity()
+                                     : 1.0f);
+  }
+  if (style->mMozContextProperties.bits &
+      StyleContextPropertyBits::STROKE_OPACITY) {
+    haveContextPaint = true;
+    contextPaint->SetStrokeOpacity(style->mStrokeOpacity.IsOpacity()
+                                       ? style->mStrokeOpacity.AsOpacity()
+                                       : 1.0f);
+  }
+
+  if (haveContextPaint) {
+    if (!aContext) {
+      aContext.emplace();
+    }
+    aContext->mContextPaint = std::move(contextPaint);
+  }
+}
+
+}  // namespace mozilla