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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 */
#include "gfxMatrix.h"
#include "gfxPoint.h"
#include "gfxRect.h"
#include "nsQueryFrame.h"
#include "nsRect.h"
#include "mozilla/gfx/MatrixFwd.h"
class gfxContext;
class nsIFrame;
namespace mozilla {
class SVGAnimatedLengthList;
class SVGAnimatedNumberList;
class SVGBBox;
class SVGLengthList;
class SVGNumberList;
class SVGUserUnitList;
namespace image {
struct imgDrawingParams;
} // namespace image
* This class is used for elements that can be part of a directly displayable
* section of a document. This includes SVGGeometryFrame and SVGGFrame.
* (Even though the latter doesn't display anything itself, if it contains
* SVGGeometryFrame descendants it is can still be part of a displayable
* section of a document) This class is not used for elements that can never
* display directly, including SVGGradientFrame and SVGPatternFrame. (The
* latter may contain displayable content, but it and its content are never
* *directly* displayed in a document. It can only end up being displayed by
* means of a reference from other content.)
* Note specifically that SVG frames that inherit SVGContainerFrame do *not*
* implement this class (only those that inherit SVGDisplayContainerFrame
* do.)
class ISVGDisplayableFrame : public nsQueryFrame {
using imgDrawingParams = image::imgDrawingParams;
* Paint this frame.
* SVG is painted using a combination of display lists (trees of
* nsDisplayItem built by BuildDisplayList() implementations) and recursive
* PaintSVG calls. SVG frames with the NS_FRAME_IS_NONDISPLAY bit set are
* always painted using recursive PaintSVG calls since display list painting
* would provide no advantages (they wouldn't be retained for invalidation).
* Displayed SVG is normally painted via a display list tree created under
* SVGOuterSVGFrame::BuildDisplayList, In future we may use a PaintSVG() call
* that recurses over the entire SVG frame tree on SVG container frames to
* avoid display list construction when it is expensive and unnecessary (see
* @param aTransform The transform that has to be multiplied onto the
* DrawTarget in order for drawing to be in this frame's SVG user space.
* Implementations of this method should avoid multiplying aTransform onto
* the DrawTarget when possible and instead just pass a transform down to
* their children. This is preferable because changing the transform is
* very expensive for certain DrawTarget backends so it is best to minimize
* the number of transform changes.
* @param aImgParams imagelib parameters that may be used when painting
* feImage.
virtual void PaintSVG(gfxContext& aContext, const gfxMatrix& aTransform,
imgDrawingParams& aImgParams) = 0;
* Returns the frame that should handle pointer events at aPoint. aPoint is
* expected to be in the SVG user space of the frame on which this method is
* called. The frame returned may be the frame on which this method is
* called, any of its descendants or else nullptr.
virtual nsIFrame* GetFrameForPoint(const gfxPoint& aPoint) = 0;
// Called on SVG child frames (except NS_FRAME_IS_NONDISPLAY frames)
// to update and then invalidate their cached bounds. This method is not
// called until after the SVGOuterSVGFrame has had its initial reflow
// (i.e. once the SVG viewport dimensions are known). It should also only
// be called by SVGOuterSVGFrame during its reflow.
virtual void ReflowSVG() = 0;
// Flags to pass to NotifySVGChange:
// the current transform matrix for this frame has changed
// the dimensions of this frame's coordinate context has changed (percentage
// lengths must be reevaluated)
// the page's zoom level has changed
enum SVGChangedFlags {
* This is called on a frame when there has been a change to one of its
* ancestors that might affect the frame too. SVGChangedFlags are passed
* to indicate what changed.
* Implementations do not need to invalidate, since the caller will
* invalidate the entire area of the ancestor that changed. However, they
* may need to update their bounds.
virtual void NotifySVGChanged(uint32_t aFlags) = 0;
* Get this frame's contribution to the rect returned by a GetBBox() call
* that occurred either on this element, or on one of its ancestors.
* SVG defines an element's bbox to be the element's fill bounds in the
* userspace established by that element. By allowing callers to pass in the
* transform from the userspace established by this element to the userspace
* established by an an ancestor, this method allows callers to obtain this
* element's fill bounds in the userspace established by that ancestor
* instead. In that case, since we return the bounds in a different userspace
* (the ancestor's), the bounds we return are not this element's bbox, but
* rather this element's contribution to the bbox of the ancestor.
* @param aToBBoxUserspace The transform from the userspace established by
* this element to the userspace established by the ancestor on which
* getBBox was called. This will be the identity matrix if we are the
* element on which getBBox was called.
* @param aFlags Flags indicating whether, stroke, for example, should be
* included in the bbox calculation.
virtual SVGBBox GetBBoxContribution(const gfx::Matrix& aToBBoxUserspace,
uint32_t aFlags) = 0;
// Are we a container frame?
virtual bool IsDisplayContainer() = 0;
} // namespace mozilla