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323 lines
12 KiB
C++
323 lines
12 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_FILTERINSTANCE_H__
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#define __NS_FILTERINSTANCE_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 "nsCOMPtr.h"
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#include "nsHashKeys.h"
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#include "nsPoint.h"
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#include "nsRect.h"
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#include "nsSize.h"
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#include "nsSVGFilters.h"
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#include "nsSVGNumber2.h"
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#include "nsSVGNumberPair.h"
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#include "nsTArray.h"
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#include "nsIFrame.h"
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#include "mozilla/gfx/2D.h"
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class gfxASurface;
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class nsIFrame;
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class nsSVGFilterPaintCallback;
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/**
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* This class performs all filter processing.
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*
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* We build a graph of the filter image data flow, essentially
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* converting the filter graph to SSA. This lets us easily propagate
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* analysis data (such as bounding-boxes) over the filter primitive graph.
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*
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* Definition of "filter space": filter space is a coordinate system that is
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* aligned with the user space of the filtered element, with its origin located
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* at the top left of the filter region, and with one unit equal in size to one
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* pixel of the offscreen surface into which the filter output would/will be
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* painted.
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*
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* The definition of "filter region" can be found here:
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* http://www.w3.org/TR/SVG11/filters.html#FilterEffectsRegion
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*/
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class nsFilterInstance
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{
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typedef mozilla::gfx::IntRect IntRect;
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typedef mozilla::gfx::SourceSurface SourceSurface;
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typedef mozilla::gfx::DrawTarget DrawTarget;
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typedef mozilla::gfx::FilterPrimitiveDescription FilterPrimitiveDescription;
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public:
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/**
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* Paint the given filtered frame.
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* @param aDirtyArea The area than needs to be painted, in aFilteredFrame's
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* frame space (i.e. relative to its origin, the top-left corner of its
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* border box).
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*/
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static nsresult PaintFilteredFrame(nsRenderingContext *aContext,
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nsIFrame *aFilteredFrame,
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nsSVGFilterPaintCallback *aPaintCallback,
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const nsRegion* aDirtyArea,
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nsIFrame* aTransformRoot = nullptr);
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/**
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* Returns the post-filter area that could be dirtied when the given
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* pre-filter area of aFilteredFrame changes.
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* @param aPreFilterDirtyRegion The pre-filter area of aFilteredFrame that has
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* changed, relative to aFilteredFrame, in app units.
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*/
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static nsRegion GetPostFilterDirtyArea(nsIFrame *aFilteredFrame,
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const nsRegion& aPreFilterDirtyRegion);
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/**
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* Returns the pre-filter area that is needed from aFilteredFrame when the
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* given post-filter area needs to be repainted.
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* @param aPostFilterDirtyRegion The post-filter area that is dirty, relative
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* to aFilteredFrame, in app units.
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*/
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static nsRegion GetPreFilterNeededArea(nsIFrame *aFilteredFrame,
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const nsRegion& aPostFilterDirtyRegion);
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/**
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* Returns the post-filter visual overflow rect (paint bounds) of
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* aFilteredFrame.
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* @param aOverrideBBox A user space rect, in user units, that should be used
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* as aFilteredFrame's bbox ('bbox' is a specific SVG term), if non-null.
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* @param aPreFilterBounds The pre-filter visual overflow rect of
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* aFilteredFrame, if non-null.
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*/
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static nsRect GetPostFilterBounds(nsIFrame *aFilteredFrame,
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const gfxRect *aOverrideBBox = nullptr,
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const nsRect *aPreFilterBounds = nullptr);
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/**
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* @param aTargetFrame The frame of the filtered element under consideration.
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* @param aPaintCallback [optional] The callback that Render() should use to
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* paint. Only required if you will call Render().
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* @param aPostFilterDirtyRegion [optional] The post-filter area
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* that has to be repainted, in app units. Only required if you will
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* call ComputeSourceNeededRect() or Render().
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* @param aPreFilterDirtyRegion [optional] The pre-filter area of
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* the filtered element that changed, in app units. Only required if you
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* will call ComputePostFilterDirtyRegion().
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* @param aOverridePreFilterVisualOverflowRect [optional] Use a different
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* visual overflow rect for the target element.
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* @param aOverrideBBox [optional] Use a different SVG bbox for the target
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* element.
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* @param aTransformRoot [optional] The transform root frame for painting.
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*/
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nsFilterInstance(nsIFrame *aTargetFrame,
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nsSVGFilterPaintCallback *aPaintCallback,
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const nsRegion *aPostFilterDirtyRegion = nullptr,
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const nsRegion *aPreFilterDirtyRegion = nullptr,
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const nsRect *aOverridePreFilterVisualOverflowRect = nullptr,
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const gfxRect *aOverrideBBox = nullptr,
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nsIFrame* aTransformRoot = nullptr);
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/**
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* Returns true if the filter instance was created successfully.
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*/
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bool IsInitialized() const { return mInitialized; }
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/**
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* Draws the filter output into aContext. The area that
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* needs to be painted must have been specified before calling this method
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* by passing it as the aPostFilterDirtyRegion argument to the
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* nsFilterInstance constructor.
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*/
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nsresult Render(gfxContext* aContext);
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/**
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* Sets the aPostFilterDirtyRegion outparam to the post-filter area in frame
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* space that would be dirtied by mTargetFrame when a given
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* pre-filter area of mTargetFrame is dirtied. The pre-filter area must have
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* been specified before calling this method by passing it as the
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* aPreFilterDirtyRegion argument to the nsFilterInstance constructor.
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*/
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nsresult ComputePostFilterDirtyRegion(nsRegion* aPostFilterDirtyRegion);
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/**
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* Sets the aPostFilterExtents outparam to the post-filter bounds in frame
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* space for the whole filter output. This is not necessarily equivalent to
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* the area that would be dirtied in the result when the entire pre-filter
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* area is dirtied, because some filter primitives can generate output
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* without any input.
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*/
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nsresult ComputePostFilterExtents(nsRect* aPostFilterExtents);
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/**
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* Sets the aDirty outparam to the pre-filter bounds in frame space of the
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* area of mTargetFrame that is needed in order to paint the filtered output
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* for a given post-filter dirtied area. The post-filter area must have been
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* specified before calling this method by passing it as the aPostFilterDirtyRegion
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* argument to the nsFilterInstance constructor.
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*/
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nsresult ComputeSourceNeededRect(nsRect* aDirty);
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/**
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* Returns the transform from filter space to outer-<svg> device space.
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*/
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gfxMatrix GetFilterSpaceToDeviceSpaceTransform() const {
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return mFilterSpaceToDeviceSpaceTransform;
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}
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private:
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struct SourceInfo {
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// Specifies which parts of the source need to be rendered.
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// Set by ComputeNeededBoxes().
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nsIntRect mNeededBounds;
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// The surface that contains the input rendering.
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// Set by BuildSourceImage / BuildSourcePaint.
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mozilla::RefPtr<SourceSurface> mSourceSurface;
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// The position and size of mSourceSurface in filter space.
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// Set by BuildSourceImage / BuildSourcePaint.
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IntRect mSurfaceRect;
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};
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/**
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* Creates a SourceSurface for either the FillPaint or StrokePaint graph
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* nodes
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*/
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nsresult BuildSourcePaint(SourceInfo *aPrimitive,
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gfxASurface* aTargetSurface,
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DrawTarget* aTargetDT);
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/**
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* Creates a SourceSurface for either the FillPaint and StrokePaint graph
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* nodes, fills its contents and assigns it to mFillPaint.mSourceSurface and
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* mStrokePaint.mSourceSurface respectively.
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*/
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nsresult BuildSourcePaints(gfxASurface* aTargetSurface,
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DrawTarget* aTargetDT);
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/**
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* Creates the SourceSurface for the SourceGraphic graph node, paints its
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* contents, and assigns it to mSourceGraphic.mSourceSurface.
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*/
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nsresult BuildSourceImage(gfxASurface* aTargetSurface,
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DrawTarget* aTargetDT);
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/**
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* Build the list of FilterPrimitiveDescriptions that describes the filter's
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* filter primitives and their connections. This populates
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* mPrimitiveDescriptions and mInputImages.
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*/
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nsresult BuildPrimitives();
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/**
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* Add to the list of FilterPrimitiveDescriptions for a particular SVG
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* reference filter or CSS filter. This populates mPrimitiveDescrs and
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* mInputImages.
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*/
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nsresult BuildPrimitivesForFilter(const nsStyleFilter& aFilter);
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/**
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* Computes the filter space bounds of the areas that we actually *need* from
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* the filter sources, based on the value of mPostFilterDirtyRegion.
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* This sets mNeededBounds on the corresponding SourceInfo structs.
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*/
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void ComputeNeededBoxes();
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/**
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* Compute the scale factors between user space and filter space.
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*/
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nsresult ComputeUserSpaceToFilterSpaceScale();
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/**
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* Transform a rect between user space and filter space.
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*/
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gfxRect UserSpaceToFilterSpace(const gfxRect& aUserSpace) const;
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gfxRect FilterSpaceToUserSpace(const gfxRect& aFilterSpaceRect) const;
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/**
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* Converts an nsRect or an nsRegion that is relative to a filtered frame's
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* origin (i.e. the top-left corner of its border box) into filter space,
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* rounding out.
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* Returns the entire filter region if aRect / aRegion is null, or if the
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* result is too large to be stored in an nsIntRect.
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*/
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nsIntRect FrameSpaceToFilterSpace(const nsRect* aRect) const;
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nsIntRegion FrameSpaceToFilterSpace(const nsRegion* aRegion) const;
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/**
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* Converts an nsIntRect or an nsIntRegion from filter space into the space
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* that is relative to a filtered frame's origin (i.e. the top-left corner
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* of its border box) in app units, rounding out.
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*/
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nsRect FilterSpaceToFrameSpace(const nsIntRect& aRect) const;
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nsRegion FilterSpaceToFrameSpace(const nsIntRegion& aRegion) const;
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/**
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* Returns the transform from frame space to the coordinate space that
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* GetCanvasTM transforms to. "Frame space" is the origin of a frame, aka the
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* top-left corner of its border box, aka the top left corner of its mRect.
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*/
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gfxMatrix GetUserSpaceToFrameSpaceInCSSPxTransform() const;
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/**
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* The frame for the element that is currently being filtered.
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*/
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nsIFrame* mTargetFrame;
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nsSVGFilterPaintCallback* mPaintCallback;
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/**
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* The SVG bbox of the element that is being filtered, in user space.
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*/
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gfxRect mTargetBBox;
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/**
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* The transform from filter space to outer-<svg> device space.
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*/
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gfxMatrix mFilterSpaceToDeviceSpaceTransform;
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/**
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* Transform rects between filter space and frame space in CSS pixels.
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*/
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gfxMatrix mFilterSpaceToFrameSpaceInCSSPxTransform;
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gfxMatrix mFrameSpaceInCSSPxToFilterSpaceTransform;
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/**
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* The "filter region", in the filtered element's user space.
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*/
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gfxRect mUserSpaceBounds;
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nsIntRect mFilterSpaceBounds;
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/**
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* The scale factors between user space and filter space.
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*/
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gfxSize mUserSpaceToFilterSpaceScale;
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gfxSize mFilterSpaceToUserSpaceScale;
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/**
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* Pre-filter paint bounds of the element that is being filtered, in filter
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* space.
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*/
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nsIntRect mTargetBounds;
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/**
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* The dirty area that needs to be repainted, in filter space.
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*/
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nsIntRegion mPostFilterDirtyRegion;
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/**
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* The pre-filter area of the filtered element that changed, in filter space.
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*/
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nsIntRegion mPreFilterDirtyRegion;
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SourceInfo mSourceGraphic;
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SourceInfo mFillPaint;
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SourceInfo mStrokePaint;
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nsIFrame* mTransformRoot;
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nsTArray<mozilla::RefPtr<SourceSurface>> mInputImages;
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nsTArray<FilterPrimitiveDescription> mPrimitiveDescriptions;
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int32_t mAppUnitsPerCSSPx;
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bool mInitialized;
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};
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#endif
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