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157c017816
Make the line list doubly linked and access it through a list class and iterators. Stop recomputing margins on all of the children of each block in the reflow chain (which causes O(N^2) state recovery during incremental reflow). Instead, add a second dirty bit to the lines and walk backwards through the line list to recompute vertical margins only when either dirty bit is set and the previous line was not reflowed. Add nsIFrame::IsEmpty to identify frames through which margins collapse. Fix O(N^2) propagation of float damage by maintaining a set of intervals damaged by floats (bug 61962) and be sure to damage the correct areas (bug 48138). Introduce nsCollapsingMargin to do correct collapsing of combinations of positive and negative margins (bug 50142). Clean up some odds and ends and fix another smaller O(N^2) problem in nsBlockFrame::AddFrames. r=attinasi, rbs sr=waterson
215 lines
7.1 KiB
C++
215 lines
7.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsHTMLReflowMetrics_h___
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#define nsHTMLReflowMetrics_h___
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#include <stdio.h>
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#include "nsISupports.h"
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#include "nsMargin.h"
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#include "nsRect.h"
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// for MOZ_MATHML
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#include "nsIRenderingContext.h" //to get struct nsBoundingMetrics
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struct nsSize;
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//----------------------------------------------------------------------
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// Option flags
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#define NS_REFLOW_CALC_MAX_WIDTH 0x0001
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#ifdef MOZ_MATHML
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#define NS_REFLOW_CALC_BOUNDING_METRICS 0x0002
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#endif
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/**
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* An nsCollapsingMargin represents a vertical collapsing margin between
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* blocks as described in section 8.3.1 of CSS2,
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* <URL: http://www.w3.org/TR/REC-CSS2/box.html#collapsing-margins >.
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*
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* All adjacent vertical margins collapse, and the resulting margin is
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* the sum of the largest positive margin included and the smallest (most
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* negative) negative margin included.
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*/
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struct nsCollapsingMargin {
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private:
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nscoord mMostPos; // the largest positive margin included
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nscoord mMostNeg; // the smallest negative margin included
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public:
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nsCollapsingMargin()
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: mMostPos(0),
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mMostNeg(0)
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{
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}
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nsCollapsingMargin(const nsCollapsingMargin& aOther)
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: mMostPos(aOther.mMostPos),
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mMostNeg(aOther.mMostNeg)
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{
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}
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nsCollapsingMargin& operator=(const nsCollapsingMargin& aOther)
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{
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mMostPos = aOther.mMostPos;
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mMostNeg = aOther.mMostNeg;
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return *this;
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}
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void Include(nscoord aCoord)
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{
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if (aCoord > mMostPos)
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mMostPos = aCoord;
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else if (aCoord < mMostNeg)
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mMostNeg = aCoord;
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}
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void Zero()
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{
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mMostPos = 0;
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mMostNeg = 0;
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}
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PRBool IsZero() const
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{
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return (mMostPos == 0) && (mMostNeg == 0);
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}
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nscoord get() const
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{
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return mMostPos + mMostNeg;
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}
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};
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/**
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* Reflow metrics used to return the frame's desired size and alignment
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* information.
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*
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* @see #Reflow()
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*/
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struct nsHTMLReflowMetrics {
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nscoord width, height; // [OUT] desired width and height
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nscoord ascent, descent; // [OUT] ascent and descent information
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// Set this to null if you don't need to compute the max element size
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nsSize* maxElementSize; // [OUT]
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// Used for incremental reflow. If the NS_REFLOW_CALC_MAX_WIDTH flag is set,
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// then the caller is requesting that you update and return your maximum width
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nscoord mMaximumWidth; // [OUT]
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#ifdef MOZ_MATHML
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// Metrics that _exactly_ enclose the text to allow precise MathML placements.
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// If the NS_REFLOW_CALC_BOUNDING_METRICS flag is set, then the caller is
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// requesting that you also compute additional details about your inner
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// bounding box and italic correction. For example, the bounding box of
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// msup is the smallest rectangle that _exactly_ encloses both the text
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// of the base and the text of the superscript.
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nsBoundingMetrics mBoundingMetrics; // [OUT]
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#endif
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// Carried out bottom margin values. This is the collapsed
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// (generational) bottom margin value.
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nsCollapsingMargin mCarriedOutBottomMargin;
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// For frames that have content that overflow their content area
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// (NS_FRAME_OUTSIDE_CHILDREN) this rectangle represents the total area
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// of the frame including visible overflow, i.e., don't include overflowing
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// content that is hidden.
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// The rect is in the local coordinate space of the frame, and should be at
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// least as big as the desired size. If there is no content that overflows,
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// then the overflow area is identical to the desired size and should be
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// {0, 0, mWidth, mHeight}.
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nsRect mOverflowArea;
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PRUint32 mFlags;
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// used by tables to optimize common cases
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PRBool mNothingChanged;
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nsHTMLReflowMetrics(nsSize* aMaxElementSize, PRUint32 aFlags = 0) {
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maxElementSize = aMaxElementSize;
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mMaximumWidth = 0;
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mFlags = aFlags;
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mOverflowArea.x = 0;
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mOverflowArea.y = 0;
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mOverflowArea.width = 0;
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mOverflowArea.height = 0;
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mNothingChanged = PR_FALSE;
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#ifdef MOZ_MATHML
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mBoundingMetrics.Clear();
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#endif
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// XXX These are OUT parameters and so they shouldn't have to be
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// initialized, but there are some bad frame classes that aren't
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// properly setting them when returning from Reflow()...
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width = height = 0;
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ascent = descent = 0;
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}
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void AddBorderPaddingToMaxElementSize(const nsMargin& aBorderPadding) {
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maxElementSize->width += aBorderPadding.left + aBorderPadding.right;
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maxElementSize->height += aBorderPadding.top + aBorderPadding.bottom;
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}
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nsHTMLReflowMetrics& operator=(const nsHTMLReflowMetrics& aOther)
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{
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if (maxElementSize && aOther.maxElementSize) {
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maxElementSize->width = aOther.maxElementSize->width;
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maxElementSize->height = aOther.maxElementSize->height;
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}
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mMaximumWidth = aOther.mMaximumWidth;
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mFlags = aOther.mFlags;
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mCarriedOutBottomMargin = aOther.mCarriedOutBottomMargin;
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mOverflowArea.x = aOther.mOverflowArea.x;
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mOverflowArea.y = aOther.mOverflowArea.y;
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mOverflowArea.width = aOther.mOverflowArea.width;
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mOverflowArea.height = aOther.mOverflowArea.height;
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mNothingChanged = aOther.mNothingChanged;
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#ifdef MOZ_MATHML
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mBoundingMetrics = aOther.mBoundingMetrics;
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#endif
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width = aOther.width;
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height = aOther.height;
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ascent = aOther.ascent;
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descent = aOther.descent;
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return *this;
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}
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};
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#endif /* nsHTMLReflowMetrics_h___ */
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