1 files changed, 195 insertions, 0 deletions
diff --git a/layout/generic/nsCanvasFrame.h b/layout/generic/nsCanvasFrame.h
new file mode 100644
index 0000000000..1ad0854f84
--- /dev/null
+++ b/layout/generic/nsCanvasFrame.h
@@ -0,0 +1,195 @@
+/* -*- 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/. */
+
+/* rendering object that goes directly inside the document's scrollbars */
+
+#ifndef nsCanvasFrame_h___
+#define nsCanvasFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "mozilla/EventForwards.h"
+#include "nsContainerFrame.h"
+#include "nsDisplayList.h"
+#include "nsIAnonymousContentCreator.h"
+#include "nsIPopupContainer.h"
+#include "nsIScrollPositionListener.h"
+
+class nsPresContext;
+class gfxContext;
+
+/**
+ * Root frame class.
+ *
+ * The root frame is the parent frame for the document element's frame.
+ * It only supports having a single child frame which must be an area
+ * frame.
+ * @note nsCanvasFrame keeps overflow container continuations of its child
+ * frame in the main child list.
+ */
+class nsCanvasFrame final : public nsContainerFrame,
+                            public nsIScrollPositionListener,
+                            public nsIAnonymousContentCreator,
+                            public nsIPopupContainer {
+  using Element = mozilla::dom::Element;
+
+ public:
+  explicit nsCanvasFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
+      : nsContainerFrame(aStyle, aPresContext, kClassID),
+        mDoPaintFocus(false),
+        mAddedScrollPositionListener(false) {}
+
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS(nsCanvasFrame)
+
+  Element* GetDefaultTooltip() override;
+
+  void Destroy(DestroyContext&) override;
+
+  void SetInitialChildList(ChildListID aListID,
+                           nsFrameList&& aChildList) override;
+  void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
+  void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
+                    const nsLineList::iterator* aPrevFrameLine,
+                    nsFrameList&& aFrameList) override;
+#ifdef DEBUG
+  void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override;
+#endif
+
+  nscoord GetMinISize(gfxContext* aRenderingContext) override;
+  nscoord GetPrefISize(gfxContext* aRenderingContext) override;
+  void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+              const ReflowInput& aReflowInput,
+              nsReflowStatus& aStatus) override;
+  bool IsFrameOfType(uint32_t aFlags) const override {
+    return nsContainerFrame::IsFrameOfType(
+        aFlags & ~(nsIFrame::eCanContainOverflowContainers));
+  }
+
+  // nsIAnonymousContentCreator
+  nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) override;
+  void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
+                                uint32_t aFilter) override;
+
+  Element* GetCustomContentContainer() const { return mCustomContentContainer; }
+
+  /**
+   * Unhide the CustomContentContainer. This call only has an effect if
+   * mCustomContentContainer is non-null.
+   */
+  void ShowCustomContentContainer();
+
+  /**
+   * Hide the CustomContentContainer. This call only has an effect if
+   * mCustomContentContainer is non-null.
+   */
+  void HideCustomContentContainer();
+
+  /** SetHasFocus tells the CanvasFrame to draw with focus ring
+   *  @param aHasFocus true to show focus ring, false to hide it
+   */
+  NS_IMETHOD SetHasFocus(bool aHasFocus);
+
+  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                        const nsDisplayListSet& aLists) override;
+
+  void PaintFocus(mozilla::gfx::DrawTarget* aRenderingContext, nsPoint aPt);
+
+  // nsIScrollPositionListener
+  void ScrollPositionWillChange(nscoord aX, nscoord aY) override;
+  void ScrollPositionDidChange(nscoord aX, nscoord aY) override {}
+
+#ifdef DEBUG_FRAME_DUMP
+  nsresult GetFrameName(nsAString& aResult) const override;
+#endif
+  nsresult GetContentForEvent(const mozilla::WidgetEvent* aEvent,
+                              nsIContent** aContent) override;
+
+  nsRect CanvasArea() const;
+
+ protected:
+  // Data members
+  bool mDoPaintFocus;
+  bool mAddedScrollPositionListener;
+
+  nsCOMPtr<Element> mCustomContentContainer;
+  nsCOMPtr<Element> mTooltipContent;
+};
+
+namespace mozilla {
+/**
+ * Override nsDisplayBackground methods so that we pass aBGClipRect to
+ * PaintBackground, covering the whole overflow area.
+ * We can also paint an "extra background color" behind the normal
+ * background.
+ */
+class nsDisplayCanvasBackgroundColor final : public nsDisplaySolidColorBase {
+ public:
+  nsDisplayCanvasBackgroundColor(nsDisplayListBuilder* aBuilder,
+                                 nsIFrame* aFrame)
+      : nsDisplaySolidColorBase(aBuilder, aFrame, NS_RGBA(0, 0, 0, 0)) {}
+
+  nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) const override {
+    nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
+    *aSnap = true;
+    return frame->CanvasArea() + ToReferenceFrame();
+  }
+  void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
+               HitTestState* aState, nsTArray<nsIFrame*>* aOutFrames) override {
+    // We need to override so we don't consider border-radius.
+    aOutFrames->AppendElement(mFrame);
+  }
+  bool CreateWebRenderCommands(
+      mozilla::wr::DisplayListBuilder& aBuilder,
+      mozilla::wr::IpcResourceUpdateQueue& aResources,
+      const StackingContextHelper& aSc,
+      mozilla::layers::RenderRootStateManager* aManager,
+      nsDisplayListBuilder* aDisplayListBuilder) override;
+  void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
+
+  void SetExtraBackgroundColor(nscolor aColor) { mColor = aColor; }
+
+  NS_DISPLAY_DECL_NAME("CanvasBackgroundColor", TYPE_CANVAS_BACKGROUND_COLOR)
+
+  void WriteDebugInfo(std::stringstream& aStream) override;
+};
+
+class nsDisplayCanvasBackgroundImage : public nsDisplayBackgroundImage {
+ public:
+  explicit nsDisplayCanvasBackgroundImage(nsDisplayListBuilder* aBuilder,
+                                          nsIFrame* aFrame,
+                                          const InitData& aInitData)
+      : nsDisplayBackgroundImage(aBuilder, aFrame, aInitData) {}
+
+  void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
+
+  // We still need to paint a background color as well as an image for this
+  // item, so we can't support this yet.
+  bool SupportsOptimizingToImage() const override { return false; }
+
+  bool IsSingleFixedPositionImage(nsDisplayListBuilder* aBuilder,
+                                  const nsRect& aClipRect, gfxRect* aDestRect);
+
+  NS_DISPLAY_DECL_NAME("CanvasBackgroundImage", TYPE_CANVAS_BACKGROUND_IMAGE)
+};
+
+class nsDisplayCanvasThemedBackground : public nsDisplayThemedBackground {
+ public:
+  nsDisplayCanvasThemedBackground(nsDisplayListBuilder* aBuilder,
+                                  nsIFrame* aFrame)
+      : nsDisplayThemedBackground(aBuilder, aFrame,
+                                  aFrame->GetRectRelativeToSelf() +
+                                      aBuilder->ToReferenceFrame(aFrame)) {
+    nsDisplayThemedBackground::Init(aBuilder);
+  }
+
+  void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
+
+  NS_DISPLAY_DECL_NAME("CanvasThemedBackground", TYPE_CANVAS_THEMED_BACKGROUND)
+};
+
+}  // namespace mozilla
+
+#endif /* nsCanvasFrame_h___ */