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/* -*- 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/. */

#ifndef NSSVGINTEGRATIONUTILS_H_
#define NSSVGINTEGRATIONUTILS_H_

#include "ImgDrawResult.h"
#include "gfxMatrix.h"
#include "gfxRect.h"
#include "nsRegionFwd.h"
#include "mozilla/gfx/Rect.h"
#include "mozilla/webrender/WebRenderTypes.h"

class gfxContext;
class gfxDrawable;
class nsDisplayList;
class nsDisplayListBuilder;
class nsIFrame;

struct nsRect;

namespace mozilla {
namespace gfx {
class DrawTarget;
}  // namespace gfx
namespace layers {
class LayerManager;
}  // namespace layers
}  // namespace mozilla

struct nsPoint;
struct nsSize;

struct WrFiltersHolder {
  nsTArray<mozilla::wr::FilterOp> filters;
  nsTArray<mozilla::wr::WrFilterData> filter_datas;
  // This exists just to own the values long enough for them to be copied into
  // rust.
  nsTArray<nsTArray<float>> values;
};

/**
 * Integration of SVG effects (clipPath clipping, masking and filters) into
 * regular display list based painting and hit-testing.
 */
class nsSVGIntegrationUtils final {
  typedef mozilla::gfx::DrawTarget DrawTarget;
  typedef mozilla::gfx::IntRect IntRect;
  typedef mozilla::image::imgDrawingParams imgDrawingParams;

 public:
  /**
   * Returns true if SVG effects that affect the overflow of the given frame
   * are currently applied to the frame.
   */
  static bool UsingOverflowAffectingEffects(const nsIFrame* aFrame);

  /**
   * Returns true if SVG effects are currently applied to this frame.
   */
  static bool UsingEffectsForFrame(const nsIFrame* aFrame);

  /**
   * Returns true if mask or clippath are currently applied to this frame.
   */
  static bool UsingMaskOrClipPathForFrame(const nsIFrame* aFrame);

  /**
   * Returns true if the element has a clippath that is simple enough to
   * be represented without a mask in WebRender.
   */
  static bool UsingSimpleClipPathForFrame(const nsIFrame* aFrame);

  /**
   * Returns the size of the union of the border-box rects of all of
   * aNonSVGFrame's continuations.
   */
  static nsSize GetContinuationUnionSize(nsIFrame* aNonSVGFrame);

  /**
   * When SVG effects need to resolve percentage, userSpaceOnUse lengths, they
   * need a coordinate context to resolve them against. This method provides
   * that coordinate context for non-SVG frames with SVG effects applied to
   * them. The gfxSize returned is the size of the union of all of the given
   * frame's continuations' border boxes, converted to SVG user units (equal to
   * CSS px units), as required by the SVG code.
   */
  static mozilla::gfx::Size GetSVGCoordContextForNonSVGFrame(
      nsIFrame* aNonSVGFrame);

  /**
   * SVG effects such as SVG filters, masking and clipPath may require an SVG
   * "bbox" for the element they're being applied to in order to make decisions
   * about positioning, and to resolve various lengths against. This method
   * provides the "bbox" for non-SVG frames. The bbox returned is in CSS px
   * units, and aUnionContinuations decide whether bbox contains the area of
   * current frame only or the union of all aNonSVGFrame's continuations'
   * overflow areas, relative to the top-left of the union of all aNonSVGFrame's
   * continuations' border box rects.
   */
  static gfxRect GetSVGBBoxForNonSVGFrame(nsIFrame* aNonSVGFrame,
                                          bool aUnionContinuations);

  /**
   * Used to adjust a frame's pre-effects visual overflow rect to take account
   * of SVG effects.
   *
   * XXX This method will not do the right thing for frames with continuations.
   * It really needs all the continuations to have been reflowed before being
   * called, but we currently call it on each continuation as its overflow
   * rects are set during the reflow of each particular continuation. Gecko's
   * current reflow architecture does not allow us to set the overflow rects
   * for a whole chain of continuations for a given element at the point when
   * the last continuation is reflowed. See:
   * http://groups.google.com/group/mozilla.dev.tech.layout/msg/6b179066f3051f65
   */
  static nsRect ComputePostEffectsVisualOverflowRect(
      nsIFrame* aFrame, const nsRect& aPreEffectsOverflowRect);

  /**
   * Used to adjust the area of a frame that needs to be invalidated to take
   * account of SVG effects.
   *
   * @param aFrame The effects frame.
   * @param aToReferenceFrame The offset (in app units) from aFrame to its
   * reference display item.
   * @param aInvalidRegion The pre-effects invalid region in pixels relative to
   * the reference display item.
   * @return The post-effects invalid rect in pixels relative to the reference
   * display item.
   */
  static nsIntRegion AdjustInvalidAreaForSVGEffects(
      nsIFrame* aFrame, const nsPoint& aToReferenceFrame,
      const nsIntRegion& aInvalidRegion);

  /**
   * Figure out which area of the source is needed given an area to
   * repaint
   */
  static nsRect GetRequiredSourceForInvalidArea(nsIFrame* aFrame,
                                                const nsRect& aDirtyRect);

  /**
   * Returns true if the given point is not clipped out by effects.
   * @param aPt in appunits relative to aFrame
   */
  static bool HitTestFrameForEffects(nsIFrame* aFrame, const nsPoint& aPt);

  struct MOZ_STACK_CLASS PaintFramesParams {
    gfxContext& ctx;
    nsIFrame* frame;
    const nsRect& dirtyRect;
    const nsRect& borderArea;
    nsDisplayListBuilder* builder;
    mozilla::layers::LayerManager* layerManager;
    bool handleOpacity;  // If true, PaintMaskAndClipPath/ PaintFilter should
                         // apply css opacity.
    mozilla::Maybe<mozilla::gfx::Rect> maskRect;
    imgDrawingParams& imgParams;

    explicit PaintFramesParams(gfxContext& aCtx, nsIFrame* aFrame,
                               const nsRect& aDirtyRect,
                               const nsRect& aBorderArea,
                               nsDisplayListBuilder* aBuilder,
                               mozilla::layers::LayerManager* aLayerManager,
                               bool aHandleOpacity,
                               imgDrawingParams& aImgParams)
        : ctx(aCtx),
          frame(aFrame),
          dirtyRect(aDirtyRect),
          borderArea(aBorderArea),
          builder(aBuilder),
          layerManager(aLayerManager),
          handleOpacity(aHandleOpacity),
          imgParams(aImgParams) {}
  };

  /**
   * Paint non-SVG frame with mask, clipPath and opacity effect.
   */
  static void PaintMaskAndClipPath(const PaintFramesParams& aParams);

  // This should use FunctionRef instead of std::function because we don't need
  // to take ownership of the function. See bug 1490781.
  static void PaintMaskAndClipPath(const PaintFramesParams& aParams,
                                   const std::function<void()>& aPaintChild);

  /**
   * Paint mask of non-SVG frame onto a given context, aParams.ctx.
   * aParams.ctx must contain an A8 surface. Returns false if the mask
   * didn't get painted and should be ignored at the call site.
   */
  static bool PaintMask(const PaintFramesParams& aParams);

  /**
   * Return true if all the mask resource of aFrame are ready.
   */
  static bool IsMaskResourceReady(nsIFrame* aFrame);

  /**
   * Paint non-SVG frame with filter and opacity effect.
   */
  static void PaintFilter(const PaintFramesParams& aParams);

  /**
   * Try to build WebRender filters for a frame if the filters applied to it are
   * supported.
   */
  static bool BuildWebRenderFilters(
      nsIFrame* aFilteredFrame,
      mozilla::Span<const mozilla::StyleFilter> aFilters,
      WrFiltersHolder& aWrFilters, mozilla::Maybe<nsRect>& aPostFilterClip);

  /**
   * @param aRenderingContext the target rendering context in which the paint
   * server will be rendered
   * @param aTarget the target frame onto which the paint server will be
   * rendered
   * @param aPaintServer a first-continuation frame to use as the source
   * @param aFilter a filter to be applied when scaling
   * @param aDest the area the paint server image should be mapped to
   * @param aFill the area to be filled with copies of the paint server image
   * @param aAnchor a point in aFill which we will ensure is pixel-aligned in
   * the output
   * @param aDirty pixels outside this area may be skipped
   * @param aPaintServerSize the size that would be filled when using
   * background-repeat:no-repeat and background-size:auto. For normal background
   * images, this would be the intrinsic size of the image; for gradients and
   * patterns this would be the whole target frame fill area.
   * @param aFlags pass FLAG_SYNC_DECODE_IMAGES and any images in the paint
   * server will be decoding synchronously if they are not decoded already.
   */
  enum {
    FLAG_SYNC_DECODE_IMAGES = 0x01,
  };

  static already_AddRefed<gfxDrawable> DrawableFromPaintServer(
      nsIFrame* aFrame, nsIFrame* aTarget, const nsSize& aPaintServerSize,
      const mozilla::gfx::IntSize& aRenderSize, const DrawTarget* aDrawTarget,
      const gfxMatrix& aContextMatrix, uint32_t aFlags);

  /**
   * For non-SVG frames, this gives the offset to the frame's "user space".
   * For SVG frames, this returns a zero offset.
   */
  static nsPoint GetOffsetToBoundingBox(nsIFrame* aFrame);
};

#endif /*NSSVGINTEGRATIONUTILS_H_*/