layout/generic/nsHTMLCanvasFrame.h
author Nika Layzell <nika@thelayzells.com>
Tue, 25 Sep 2018 17:34:53 +0200
changeset 507828 5e6dae0c1e5a4939ccd406f14607f7fafffd45a7
parent 465602 0016368787a44bdf5deb4c9b73f3c0b59d2bc27a
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1448426 - Wrap windows.h to avoid problematic define statements, r=froydnj,glandium By default, windows.h exposes a large number of problematic define statements which are UpperCamelCase, such as a define from `CreateWindow` to `CreateWindow{A,W}`. As many of these names are generic (e.g. CreateFile, CreateWindow), they can mess up Gecko code that may legitimately have its own methods with the same names. The header also defines some traditional SCREAMING_SNAKE_CASE defines which can mess up our code by conflicting with local values. This patch adds a simple code generator which generates wrappers for these defines, and uses them to wrap the windows.h wrapper using the `stl_wrappers` mechanism, allowing us to use windows.h in more places. Differential Revision: https://phabricator.services.mozilla.com/D10932

/* -*- 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 for the HTML <canvas> element */

#ifndef nsHTMLCanvasFrame_h___
#define nsHTMLCanvasFrame_h___

#include "mozilla/Attributes.h"
#include "nsContainerFrame.h"
#include "nsStringFwd.h"
#include "FrameLayerBuilder.h"

namespace mozilla {
namespace layers {
class Layer;
class LayerManager;
class WebRenderCanvasData;
} // namespace layers
} // namespace mozilla

class nsPresContext;
class nsDisplayItem;

nsIFrame* NS_NewHTMLCanvasFrame(nsIPresShell* aPresShell,
                                mozilla::ComputedStyle* aStyle);

class nsHTMLCanvasFrame final : public nsContainerFrame
{
public:
  typedef mozilla::layers::CanvasRenderer CanvasRenderer;
  typedef mozilla::layers::Layer Layer;
  typedef mozilla::layers::LayerManager LayerManager;
  typedef mozilla::layers::WebRenderCanvasData WebRenderCanvasData;
  typedef mozilla::ContainerLayerParameters ContainerLayerParameters;

  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS(nsHTMLCanvasFrame)

  explicit nsHTMLCanvasFrame(ComputedStyle* aStyle)
    : nsContainerFrame(aStyle, kClassID)
    , mBorderPadding(GetWritingMode())
  {}

  virtual void Init(nsIContent*       aContent,
                    nsContainerFrame* aParent,
                    nsIFrame*         aPrevInFlow) override;

  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                const nsDisplayListSet& aLists) override;

  already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
                                     LayerManager* aManager,
                                     nsDisplayItem* aItem,
                                     const ContainerLayerParameters& aContainerParameters);

  bool UpdateWebRenderCanvasData(nsDisplayListBuilder* aBuilder,
                                 WebRenderCanvasData* aCanvasData);

  /* get the size of the canvas's image */
  nsIntSize GetCanvasSize();

  virtual nscoord GetMinISize(gfxContext *aRenderingContext) override;
  virtual nscoord GetPrefISize(gfxContext *aRenderingContext) override;
  virtual mozilla::IntrinsicSize GetIntrinsicSize() override;
  virtual nsSize GetIntrinsicRatio() override;

  virtual mozilla::LogicalSize
  ComputeSize(gfxContext *aRenderingContext,
              mozilla::WritingMode aWritingMode,
              const mozilla::LogicalSize& aCBSize,
              nscoord aAvailableISize,
              const mozilla::LogicalSize& aMargin,
              const mozilla::LogicalSize& aBorder,
              const mozilla::LogicalSize& aPadding,
              ComputeSizeFlags aFlags) override;

  virtual void Reflow(nsPresContext*           aPresContext,
                      ReflowOutput&     aDesiredSize,
                      const ReflowInput& aReflowInput,
                      nsReflowStatus&          aStatus) override;

  nsRect GetInnerArea() const;

#ifdef ACCESSIBILITY
  virtual mozilla::a11y::AccType AccessibleType() override;
#endif

  virtual bool IsFrameOfType(uint32_t aFlags) const override
  {
    return nsSplittableFrame::IsFrameOfType(aFlags &
      ~(nsIFrame::eReplaced | nsIFrame::eReplacedSizing));
  }

#ifdef DEBUG_FRAME_DUMP
  virtual nsresult GetFrameName(nsAString& aResult) const override;
#endif

  // Inserted child content gets its frames parented by our child block
  virtual nsContainerFrame* GetContentInsertionFrame() override {
    return PrincipalChildList().FirstChild()->GetContentInsertionFrame();
  }

  // Return the ::-moz-html-canvas-content anonymous box.
  void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;

protected:
  virtual ~nsHTMLCanvasFrame();

  nscoord GetContinuationOffset(nscoord* aWidth = 0) const;

  mozilla::LogicalMargin mBorderPadding;
};

#endif /* nsHTMLCanvasFrame_h___ */