mirror of
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154 lines
6.5 KiB
C++
154 lines
6.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __NS_ISVGCHILDFRAME_H__
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#define __NS_ISVGCHILDFRAME_H__
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#include "gfxRect.h"
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#include "nsQueryFrame.h"
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class gfxContext;
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class gfxMatrix;
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class nsIFrame;
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class SVGBBox;
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struct nsRect;
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namespace mozilla {
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class SVGAnimatedLengthList;
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class SVGAnimatedNumberList;
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class SVGLengthList;
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class SVGNumberList;
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class SVGUserUnitList;
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namespace gfx {
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class Matrix;
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} // namespace gfx
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} // namespace mozilla
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/**
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* This class is not particularly well named. It is inherited by some, but
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* not all SVG frame classes that can be descendants of an
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* nsSVGOuterSVGFrame in the frame tree. Note specifically that SVG container
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* frames that do not inherit nsSVGDisplayContainerFrame do not inherit this
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* class (so that's classes that only inherit nsSVGContainerFrame).
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*/
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class nsISVGChildFrame : public nsQueryFrame
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{
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public:
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typedef mozilla::SVGAnimatedNumberList SVGAnimatedNumberList;
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typedef mozilla::SVGNumberList SVGNumberList;
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typedef mozilla::SVGAnimatedLengthList SVGAnimatedLengthList;
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typedef mozilla::SVGLengthList SVGLengthList;
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typedef mozilla::SVGUserUnitList SVGUserUnitList;
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NS_DECL_QUERYFRAME_TARGET(nsISVGChildFrame)
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/**
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* Paint this frame.
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*
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* SVG is painted using a combination of display lists (trees of
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* nsDisplayItem built by BuildDisplayList() implementations) and recursive
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* PaintSVG calls. SVG frames with the NS_FRAME_IS_NONDISPLAY bit set are
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* always painted using recursive PaintSVG calls since display list painting
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* would provide no advantages (they wouldn't be retained for invalidation).
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* Displayed SVG is normally painted via a display list tree created under
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* nsSVGOuterSVGFrame::BuildDisplayList, unless the
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* svg.display-lists.painting.enabled pref has been set to false by the user
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* in which case it is done via an nsSVGOuterSVGFrame::PaintSVG() call that
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* recurses over the entire SVG frame tree. In future we may use PaintSVG()
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* calls on SVG container frames to avoid display list construction when it
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* is expensive and unnecessary (see bug 934411).
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*
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* @param aTransform The transform that has to be multiplied onto the
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* DrawTarget in order for drawing to be in this frame's SVG user space.
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* Implementations of this method should avoid multiplying aTransform onto
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* the DrawTarget when possible and instead just pass a transform down to
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* their children. This is preferable because changing the transform is
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* very expensive for certain DrawTarget backends so it is best to minimize
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* the number of transform changes.
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*
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* @param aDirtyRect The area being redrawn, in frame offset pixel
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* coordinates.
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*/
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virtual nsresult PaintSVG(gfxContext& aContext,
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const gfxMatrix& aTransform,
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const nsIntRect* aDirtyRect = nullptr) = 0;
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/**
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* Returns the frame that should handle pointer events at aPoint. aPoint is
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* expected to be in the SVG user space of the frame on which this method is
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* called. The frame returned may be the frame on which this method is
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* called, any of its descendants or else nullptr.
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*/
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virtual nsIFrame* GetFrameForPoint(const gfxPoint& aPoint) = 0;
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// Get bounds in our nsSVGOuterSVGFrame's coordinates space (in app units)
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virtual nsRect GetCoveredRegion()=0;
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// Called on SVG child frames (except NS_FRAME_IS_NONDISPLAY frames)
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// to update and then invalidate their cached bounds. This method is not
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// called until after the nsSVGOuterSVGFrame has had its initial reflow
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// (i.e. once the SVG viewport dimensions are known). It should also only
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// be called by nsSVGOuterSVGFrame during its reflow.
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virtual void ReflowSVG()=0;
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// Flags to pass to NotifySVGChange:
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//
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// DO_NOT_NOTIFY_RENDERING_OBSERVERS - this should only be used when
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// updating the descendant frames of a clipPath,
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// mask, pattern or marker frame (or other similar
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// NS_FRAME_IS_NONDISPLAY frame) immediately
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// prior to painting that frame's descendants.
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// TRANSFORM_CHANGED - the current transform matrix for this frame has changed
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// COORD_CONTEXT_CHANGED - the dimensions of this frame's coordinate context has
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// changed (percentage lengths must be reevaluated)
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enum SVGChangedFlags {
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TRANSFORM_CHANGED = 0x01,
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COORD_CONTEXT_CHANGED = 0x02,
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FULL_ZOOM_CHANGED = 0x04
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};
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/**
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* This is called on a frame when there has been a change to one of its
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* ancestors that might affect the frame too. SVGChangedFlags are passed
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* to indicate what changed.
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*
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* Implementations do not need to invalidate, since the caller will
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* invalidate the entire area of the ancestor that changed. However, they
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* may need to update their bounds.
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*/
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virtual void NotifySVGChanged(uint32_t aFlags)=0;
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/**
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* Get this frame's contribution to the rect returned by a GetBBox() call
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* that occurred either on this element, or on one of its ancestors.
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*
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* SVG defines an element's bbox to be the element's fill bounds in the
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* userspace established by that element. By allowing callers to pass in the
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* transform from the userspace established by this element to the userspace
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* established by an an ancestor, this method allows callers to obtain this
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* element's fill bounds in the userspace established by that ancestor
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* instead. In that case, since we return the bounds in a different userspace
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* (the ancestor's), the bounds we return are not this element's bbox, but
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* rather this element's contribution to the bbox of the ancestor.
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*
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* @param aToBBoxUserspace The transform from the userspace established by
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* this element to the userspace established by the ancestor on which
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* getBBox was called. This will be the identity matrix if we are the
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* element on which getBBox was called.
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*
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* @param aFlags Flags indicating whether, stroke, for example, should be
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* included in the bbox calculation.
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*/
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virtual SVGBBox GetBBoxContribution(const mozilla::gfx::Matrix &aToBBoxUserspace,
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uint32_t aFlags) = 0;
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// Are we a container frame?
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virtual bool IsDisplayContainer()=0;
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};
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#endif // __NS_ISVGCHILDFRAME_H__
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