601 lines
21 KiB
C++
601 lines
21 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_SVGUTILS_H
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#define NS_SVGUTILS_H
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// include math.h to pick up definition of M_ maths defines e.g. M_PI
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#include <math.h>
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#include "DrawMode.h"
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#include "gfx2DGlue.h"
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#include "gfxMatrix.h"
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#include "gfxPoint.h"
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#include "gfxRect.h"
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#include "mozilla/gfx/Rect.h"
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#include "nsAlgorithm.h"
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#include "nsChangeHint.h"
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#include "nsColor.h"
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#include "nsCOMPtr.h"
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#include "nsID.h"
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#include "nsIFrame.h"
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#include "nsISupportsBase.h"
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#include "nsMathUtils.h"
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#include "nsStyleStruct.h"
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#include <algorithm>
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class gfxContext;
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class nsFrameList;
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class nsIContent;
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class nsIDocument;
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class nsIFrame;
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class nsPresContext;
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class nsStyleContext;
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class nsStyleSVGPaint;
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class nsSVGDisplayContainerFrame;
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class nsSVGElement;
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class nsSVGEnum;
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class nsSVGLength2;
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class nsSVGOuterSVGFrame;
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class nsSVGPathGeometryFrame;
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class nsTextFrame;
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struct nsStyleSVG;
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struct nsRect;
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namespace mozilla {
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class SVGContextPaint;
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struct SVGContextPaintImpl;
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namespace dom {
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class Element;
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class UserSpaceMetrics;
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} // namespace dom
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namespace gfx {
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class DrawTarget;
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class GeneralPattern;
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} // namespace gfx
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} // namespace mozilla
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// maximum dimension of an offscreen surface - choose so that
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// the surface size doesn't overflow a 32-bit signed int using
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// 4 bytes per pixel; in line with Factory::CheckSurfaceSize
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// In fact Macs can't even manage that
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#define NS_SVG_OFFSCREEN_MAX_DIMENSION 4096
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#define SVG_HIT_TEST_FILL 0x01
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#define SVG_HIT_TEST_STROKE 0x02
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#define SVG_HIT_TEST_CHECK_MRECT 0x04
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bool NS_SVGPathCachingEnabled();
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bool NS_SVGDisplayListHitTestingEnabled();
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bool NS_SVGDisplayListPaintingEnabled();
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bool NS_SVGNewGetBBoxEnabled();
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/**
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* Sometimes we need to distinguish between an empty box and a box
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* that contains an element that has no size e.g. a point at the origin.
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*/
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class SVGBBox {
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typedef mozilla::gfx::Rect Rect;
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public:
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SVGBBox()
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: mIsEmpty(true) {}
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MOZ_IMPLICIT SVGBBox(const Rect& aRect)
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: mBBox(aRect), mIsEmpty(false) {}
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MOZ_IMPLICIT SVGBBox(const gfxRect& aRect)
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: mBBox(ToRect(aRect)), mIsEmpty(false) {}
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gfxRect ToThebesRect() const {
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return ThebesRect(mBBox);
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}
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bool IsEmpty() const {
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return mIsEmpty;
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}
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bool IsFinite() const {
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return mBBox.IsFinite();
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}
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void Scale(float aScale) {
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mBBox.Scale(aScale);
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}
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void UnionEdges(const SVGBBox& aSVGBBox) {
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if (aSVGBBox.mIsEmpty) {
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return;
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}
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mBBox = mIsEmpty ? aSVGBBox.mBBox : mBBox.UnionEdges(aSVGBBox.mBBox);
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mIsEmpty = false;
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}
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void Intersect(const SVGBBox& aSVGBBox) {
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if (!mIsEmpty && !aSVGBBox.mIsEmpty) {
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mBBox = mBBox.Intersect(aSVGBBox.mBBox);
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if (mBBox.IsEmpty()) {
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mIsEmpty = true;
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mBBox = Rect(0, 0, 0, 0);
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}
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} else {
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mIsEmpty = true;
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mBBox = Rect(0, 0, 0, 0);
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}
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}
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private:
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Rect mBBox;
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bool mIsEmpty;
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};
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// GRRR WINDOWS HATE HATE HATE
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#undef CLIP_MASK
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class MOZ_RAII SVGAutoRenderState
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{
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typedef mozilla::gfx::DrawTarget DrawTarget;
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public:
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explicit SVGAutoRenderState(DrawTarget* aDrawTarget
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MOZ_GUARD_OBJECT_NOTIFIER_PARAM);
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~SVGAutoRenderState();
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void SetPaintingToWindow(bool aPaintingToWindow);
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static bool IsPaintingToWindow(DrawTarget* aDrawTarget);
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private:
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DrawTarget* mDrawTarget;
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void* mOriginalRenderState;
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bool mPaintingToWindow;
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
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};
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#define NS_ISVGFILTERREFERENCE_IID \
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{ 0x9744ee20, 0x1bcf, 0x4c62, \
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{ 0x86, 0x7d, 0xd3, 0x7a, 0x91, 0x60, 0x3e, 0xef } }
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class nsISVGFilterReference : public nsISupports
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISVGFILTERREFERENCE_IID)
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virtual void Invalidate() = 0;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsISVGFilterReference, NS_ISVGFILTERREFERENCE_IID)
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/**
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* General functions used by all of SVG layout and possibly content code.
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* If a method is used by content and depends only on other content methods
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* it should go in SVGContentUtils instead.
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*/
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class nsSVGUtils
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{
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public:
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typedef mozilla::dom::Element Element;
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typedef mozilla::gfx::AntialiasMode AntialiasMode;
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typedef mozilla::gfx::DrawTarget DrawTarget;
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typedef mozilla::gfx::FillRule FillRule;
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typedef mozilla::gfx::GeneralPattern GeneralPattern;
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typedef mozilla::gfx::Size Size;
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typedef mozilla::SVGContextPaint SVGContextPaint;
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typedef mozilla::SVGContextPaintImpl SVGContextPaintImpl;
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typedef mozilla::image::DrawResult DrawResult;
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static void Init();
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NS_DECLARE_FRAME_PROPERTY_DELETABLE(ObjectBoundingBoxProperty, gfxRect)
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/**
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* Gets the nearest nsSVGInnerSVGFrame or nsSVGOuterSVGFrame frame. aFrame
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* must be an SVG frame. If aFrame is of type nsGkAtoms::svgOuterSVGFrame,
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* returns nullptr.
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*/
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static nsSVGDisplayContainerFrame* GetNearestSVGViewport(nsIFrame *aFrame);
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/**
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* Returns the frame's post-filter visual overflow rect when passed the
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* frame's pre-filter visual overflow rect. If the frame is not currently
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* being filtered, this function simply returns aUnfilteredRect.
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*/
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static nsRect GetPostFilterVisualOverflowRect(nsIFrame *aFrame,
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const nsRect &aUnfilteredRect);
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/**
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* Schedules an update of the frame's bounds (which will in turn invalidate
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* the new area that the frame should paint to).
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*
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* This does nothing when passed an NS_FRAME_IS_NONDISPLAY frame.
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* In future we may want to allow ReflowSVG to be called on such frames,
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* but that would be better implemented as a ForceReflowSVG function to
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* be called synchronously while painting them without marking or paying
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* attention to dirty bits like this function.
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*
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* This is very similar to PresShell::FrameNeedsReflow. The main reason that
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* we have this function instead of using FrameNeedsReflow is because we need
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* to be able to call it under nsSVGOuterSVGFrame::NotifyViewportChange when
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* that function is called by nsSVGOuterSVGFrame::Reflow. FrameNeedsReflow
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* is not suitable for calling during reflow though, and it asserts as much.
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* The reason that we want to be callable under NotifyViewportChange is
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* because we want to synchronously notify and dirty the nsSVGOuterSVGFrame's
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* children so that when nsSVGOuterSVGFrame::DidReflow is called its children
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* will be updated for the new size as appropriate. Otherwise we'd have to
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* post an event to the event loop to mark dirty flags and request an update.
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*
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* Another reason that we don't currently want to call
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* PresShell::FrameNeedsReflow is because passing eRestyle to it to get it to
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* mark descendants dirty would cause it to descend through
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* nsSVGForeignObjectFrame frames to mark their children dirty, but we want to
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* handle nsSVGForeignObjectFrame specially. It would also do unnecessary work
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* descending into NS_FRAME_IS_NONDISPLAY frames.
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*/
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static void ScheduleReflowSVG(nsIFrame *aFrame);
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/**
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* Returns true if the frame or any of its children need ReflowSVG
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* to be called on them.
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*/
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static bool NeedsReflowSVG(nsIFrame *aFrame);
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/*
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* Update the filter invalidation region for ancestor frames, if relevant.
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*/
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static void NotifyAncestorsOfFilterRegionChange(nsIFrame *aFrame);
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/**
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* Percentage lengths in SVG are resolved against the width/height of the
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* nearest viewport (or its viewBox, if set). This helper returns the size
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* of this "context" for the given frame so that percentage values can be
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* resolved.
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*/
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static Size GetContextSize(const nsIFrame* aFrame);
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/* Computes the input length in terms of object space coordinates.
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Input: rect - bounding box
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length - length to be converted
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*/
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static float ObjectSpace(const gfxRect &aRect, const nsSVGLength2 *aLength);
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/* Computes the input length in terms of user space coordinates.
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Input: content - object to be used for determining user space
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Input: length - length to be converted
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*/
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static float UserSpace(nsSVGElement *aSVGElement, const nsSVGLength2 *aLength);
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static float UserSpace(nsIFrame *aFrame, const nsSVGLength2 *aLength);
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static float UserSpace(const mozilla::dom::UserSpaceMetrics& aMetrics, const nsSVGLength2 *aLength);
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/* Find the outermost SVG frame of the passed frame */
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static nsSVGOuterSVGFrame *
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GetOuterSVGFrame(nsIFrame *aFrame);
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/**
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* Get the covered region for a frame. Return null if it's not an SVG frame.
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* @param aRect gets a rectangle in app units
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* @return the outer SVG frame which aRect is relative to
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*/
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static nsIFrame*
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GetOuterSVGFrameAndCoveredRegion(nsIFrame* aFrame, nsRect* aRect);
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/* Paint SVG frame with SVG effects - aDirtyRect is the area being
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* redrawn, in device pixel coordinates relative to the outer svg */
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static DrawResult
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PaintFrameWithEffects(nsIFrame *aFrame,
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gfxContext& aContext,
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const gfxMatrix& aTransform,
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const nsIntRect *aDirtyRect = nullptr);
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/* Hit testing - check if point hits the clipPath of indicated
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* frame. Returns true if no clipPath set. */
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static bool
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HitTestClip(nsIFrame *aFrame, const gfxPoint &aPoint);
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/**
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* Hit testing - check if point hits any children of aFrame. aPoint is
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* expected to be in the coordinate space established by aFrame for its
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* children (e.g. the space established by the 'viewBox' attribute on <svg>).
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*/
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static nsIFrame *
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HitTestChildren(nsSVGDisplayContainerFrame *aFrame, const gfxPoint &aPoint);
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/*
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* Returns the CanvasTM of the indicated frame, whether it's a
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* child SVG frame, container SVG frame, or a regular frame.
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* For regular frames, we just return an identity matrix.
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*/
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static gfxMatrix GetCanvasTM(nsIFrame* aFrame);
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/**
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* Returns the transform from aFrame's user space to canvas space. Only call
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* with SVG frames. This is like GetCanvasTM, except that it only includes
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* the transforms from aFrame's user space (i.e. the coordinate context
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* established by its 'transform' attribute, or else the coordinate context
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* that its _parent_ establishes for its children) to outer-<svg> device
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* space. Specifically, it does not include any other transforms introduced
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* by the frame such as x/y offsets and viewBox attributes.
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*/
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static gfxMatrix GetUserToCanvasTM(nsIFrame* aFrame);
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/**
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* Notify the descendants of aFrame of a change to one of their ancestors
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* that might affect them.
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*/
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static void
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NotifyChildrenOfSVGChange(nsIFrame *aFrame, uint32_t aFlags);
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/*
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* Get frame's covered region by walking the children and doing union.
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*/
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static nsRect
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GetCoveredRegion(const nsFrameList &aFrames);
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static nsRect
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TransformFrameRectToOuterSVG(const nsRect& aRect,
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const gfxMatrix& aMatrix,
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nsPresContext* aPresContext);
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/*
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* Convert a surface size to an integer for use by thebes
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* possibly making it smaller in the process so the surface does not
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* use excessive memory.
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*
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* @param aSize the desired surface size
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* @param aResultOverflows true if the desired surface size is too big
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* @return the surface size to use
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*/
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static mozilla::gfx::IntSize ConvertToSurfaceSize(const gfxSize& aSize,
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bool *aResultOverflows);
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/*
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* Hit test a given rectangle/matrix.
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*/
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static bool
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HitTestRect(const mozilla::gfx::Matrix &aMatrix,
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float aRX, float aRY, float aRWidth, float aRHeight,
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float aX, float aY);
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/**
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* Get the clip rect for the given frame, taking into account the CSS 'clip'
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* property. See:
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* http://www.w3.org/TR/SVG11/masking.html#OverflowAndClipProperties
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* The arguments for aX, aY, aWidth and aHeight should be the dimensions of
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* the viewport established by aFrame.
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*/
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static gfxRect
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GetClipRectForFrame(nsIFrame *aFrame,
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float aX, float aY, float aWidth, float aHeight);
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static void SetClipRect(gfxContext *aContext,
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const gfxMatrix &aCTM,
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const gfxRect &aRect);
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/* Using group opacity instead of fill or stroke opacity on a
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* geometry object seems to be a common authoring mistake. If we're
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* not applying filters and not both stroking and filling, we can
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* generate the same result without going through the overhead of a
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* push/pop group. */
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static bool
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CanOptimizeOpacity(nsIFrame *aFrame);
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/**
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* Take the CTM to userspace for an element, and adjust it to a CTM to its
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* object bounding box space if aUnits is SVG_UNIT_TYPE_OBJECTBOUNDINGBOX.
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* (I.e. so that [0,0] is at the top left of its bbox, and [1,1] is at the
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* bottom right of its bbox).
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*
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* If the bbox is empty, this will return a singular matrix.
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*/
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static gfxMatrix
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AdjustMatrixForUnits(const gfxMatrix &aMatrix,
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nsSVGEnum *aUnits,
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nsIFrame *aFrame);
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enum BBoxFlags {
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eBBoxIncludeFill = 1 << 0,
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eBBoxIncludeFillGeometry = 1 << 1,
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eBBoxIncludeStroke = 1 << 2,
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eBBoxIncludeStrokeGeometry = 1 << 3,
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eBBoxIncludeMarkers = 1 << 4,
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eBBoxIncludeClipped = 1 << 5
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};
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/**
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* Get the SVG bbox (the SVG spec's simplified idea of bounds) of aFrame in
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* aFrame's userspace.
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*/
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static gfxRect GetBBox(nsIFrame *aFrame,
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// If the default arg changes, update the handling for
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// ObjectBoundingBoxProperty() in the implementation.
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uint32_t aFlags = eBBoxIncludeFillGeometry);
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/*
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* "User space" is the space that the frame's BBox (as calculated by
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* nsSVGUtils::GetBBox) is in. "Frame space" is the space that has its origin
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* at the top left of the union of the frame's border-box rects over all
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* continuations.
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* This function returns the offset one needs to add to something in frame
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* space in order to get its coordinates in user space.
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*/
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static gfxPoint FrameSpaceInCSSPxToUserSpaceOffset(nsIFrame *aFrame);
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/**
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* Convert a userSpaceOnUse/objectBoundingBoxUnits rectangle that's specified
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* using four nsSVGLength2 values into a user unit rectangle in user space.
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*
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* @param aXYWH pointer to 4 consecutive nsSVGLength2 objects containing
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* the x, y, width and height values in that order
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* @param aBBox the bounding box of the object the rect is relative to;
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* may be null if aUnits is not SVG_UNIT_TYPE_OBJECTBOUNDINGBOX
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* @param aFrame the object in which to interpret user-space units;
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* may be null if aUnits is SVG_UNIT_TYPE_OBJECTBOUNDINGBOX
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*/
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static gfxRect
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GetRelativeRect(uint16_t aUnits, const nsSVGLength2 *aXYWH,
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const gfxRect& aBBox, nsIFrame *aFrame);
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static gfxRect
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GetRelativeRect(uint16_t aUnits, const nsSVGLength2 *aXYWH,
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const gfxRect& aBBox,
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const mozilla::dom::UserSpaceMetrics& aMetrics);
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/**
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* Find the first frame, starting with aStartFrame and going up its
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* parent chain, that is not an svgAFrame.
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*/
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static nsIFrame* GetFirstNonAAncestorFrame(nsIFrame* aStartFrame);
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static bool OuterSVGIsCallingReflowSVG(nsIFrame *aFrame);
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static bool AnyOuterSVGIsCallingReflowSVG(nsIFrame *aFrame);
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/**
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* See https://svgwg.org/svg2-draft/painting.html#NonScalingStroke
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*
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* If the computed value of the 'vector-effect' property on aFrame is
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* 'non-scaling-stroke', then this function will set aUserToOuterSVG to the
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* transform from aFrame's SVG user space to the initial coordinate system
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* established by the viewport of aFrame's outer-<svg>'s (the coordinate
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* system in which the stroke is fixed). If aUserToOuterSVG is set to a
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* non-identity matrix this function returns true, else it returns false.
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*/
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static bool GetNonScalingStrokeTransform(nsIFrame *aFrame,
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gfxMatrix* aUserToOuterSVG);
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/**
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* Compute the maximum possible device space stroke extents of a path given
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* the path's device space path extents, its stroke style and its ctm.
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*
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* This is a workaround for the lack of suitable cairo API for getting the
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* tight device space stroke extents of a path. This basically gives us the
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* tightest extents that we can guarantee fully enclose the inked stroke
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* without doing the calculations for the actual tight extents. We exploit
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* the fact that cairo does have an API for getting the tight device space
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* fill/path extents.
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*
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* This should die once bug 478152 is fixed.
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*/
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static gfxRect PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
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nsTextFrame* aFrame,
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const gfxMatrix& aMatrix);
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static gfxRect PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
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|
nsSVGPathGeometryFrame* aFrame,
|
|
const gfxMatrix& aMatrix);
|
|
|
|
/**
|
|
* Convert a floating-point value to a 32-bit integer value, clamping to
|
|
* the range of valid integers.
|
|
*/
|
|
static int32_t ClampToInt(double aVal)
|
|
{
|
|
return NS_lround(std::max(double(INT32_MIN),
|
|
std::min(double(INT32_MAX), aVal)));
|
|
}
|
|
|
|
static nscolor GetFallbackOrPaintColor(nsStyleContext *aStyleContext,
|
|
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke);
|
|
|
|
static void
|
|
MakeFillPatternFor(nsIFrame *aFrame,
|
|
gfxContext* aContext,
|
|
GeneralPattern* aOutPattern,
|
|
SVGContextPaint* aContextPaint = nullptr);
|
|
|
|
static void
|
|
MakeStrokePatternFor(nsIFrame* aFrame,
|
|
gfxContext* aContext,
|
|
GeneralPattern* aOutPattern,
|
|
SVGContextPaint* aContextPaint = nullptr);
|
|
|
|
static float GetOpacity(nsStyleSVGOpacitySource aOpacityType,
|
|
const float& aOpacity,
|
|
SVGContextPaint* aContextPaint);
|
|
|
|
/*
|
|
* @return false if there is no stroke
|
|
*/
|
|
static bool HasStroke(nsIFrame* aFrame,
|
|
SVGContextPaint* aContextPaint = nullptr);
|
|
|
|
static float GetStrokeWidth(nsIFrame* aFrame,
|
|
SVGContextPaint* aContextPaint = nullptr);
|
|
|
|
/*
|
|
* Set up a cairo context for a stroked path (including any dashing that
|
|
* applies).
|
|
*/
|
|
static void SetupCairoStrokeGeometry(nsIFrame* aFrame, gfxContext *aContext,
|
|
SVGContextPaint* aContextPaint = nullptr);
|
|
|
|
/**
|
|
* This function returns a set of bit flags indicating which parts of the
|
|
* element (fill, stroke, bounds) should intercept pointer events. It takes
|
|
* into account the type of element and the value of the 'pointer-events'
|
|
* property on the element.
|
|
*/
|
|
static uint16_t GetGeometryHitTestFlags(nsIFrame* aFrame);
|
|
|
|
static FillRule ToFillRule(mozilla::StyleFillRule aFillRule) {
|
|
return aFillRule == mozilla::StyleFillRule::Evenodd ?
|
|
FillRule::FILL_EVEN_ODD : FillRule::FILL_WINDING;
|
|
}
|
|
|
|
static AntialiasMode ToAntialiasMode(uint8_t aTextRendering) {
|
|
return aTextRendering == NS_STYLE_TEXT_RENDERING_OPTIMIZESPEED ?
|
|
AntialiasMode::NONE : AntialiasMode::SUBPIXEL;
|
|
}
|
|
|
|
/**
|
|
* Render a SVG glyph.
|
|
* @param aElement the SVG glyph element to render
|
|
* @param aContext the thebes aContext to draw to
|
|
* @return true if rendering succeeded
|
|
*/
|
|
static bool PaintSVGGlyph(Element* aElement, gfxContext* aContext);
|
|
/**
|
|
* Get the extents of a SVG glyph.
|
|
* @param aElement the SVG glyph element
|
|
* @param aSVGToAppSpace the matrix mapping the SVG glyph space to the
|
|
* target context space
|
|
* @param aResult the result (valid when true is returned)
|
|
* @return true if calculating the extents succeeded
|
|
*/
|
|
static bool GetSVGGlyphExtents(Element* aElement,
|
|
const gfxMatrix& aSVGToAppSpace,
|
|
gfxRect* aResult);
|
|
|
|
/**
|
|
* Returns the app unit canvas bounds of a userspace rect.
|
|
*
|
|
* @param aToCanvas Transform from userspace to canvas device space.
|
|
*/
|
|
static nsRect
|
|
ToCanvasBounds(const gfxRect &aUserspaceRect,
|
|
const gfxMatrix &aToCanvas,
|
|
const nsPresContext *presContext);
|
|
|
|
struct MaskUsage {
|
|
bool shouldGenerateMaskLayer;
|
|
bool shouldGenerateClipMaskLayer;
|
|
bool shouldApplyClipPath;
|
|
bool shouldApplyBasicShape;
|
|
float opacity;
|
|
|
|
MaskUsage()
|
|
: shouldGenerateMaskLayer(false), shouldGenerateClipMaskLayer(false),
|
|
shouldApplyClipPath(false), shouldApplyBasicShape(false), opacity(0.0)
|
|
{ }
|
|
};
|
|
|
|
static void
|
|
DetermineMaskUsage(nsIFrame* aFrame, bool aHandleOpacity, MaskUsage& aUsage);
|
|
|
|
static float
|
|
ComputeOpacity(nsIFrame* aFrame, bool aHandleOpacity);
|
|
};
|
|
|
|
#endif
|