layout/style/nsStyleStruct.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is mozilla.org code.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   David Hyatt (hyatt@netscape.com)
  24  *   Mats Palmgren <mats.palmgren@bredband.net>
  25  *   Michael Ventnor <m.ventnor@gmail.com>
  26  *
  27  * Alternatively, the contents of this file may be used under the terms of
  28  * either of the GNU General Public License Version 2 or later (the "GPL"),
  29  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  30  * in which case the provisions of the GPL or the LGPL are applicable instead
  31  * of those above. If you wish to allow use of your version of this file only
  32  * under the terms of either the GPL or the LGPL, and not to allow others to
  33  * use your version of this file under the terms of the MPL, indicate your
  34  * decision by deleting the provisions above and replace them with the notice
  35  * and other provisions required by the GPL or the LGPL. If you do not delete
  36  * the provisions above, a recipient may use your version of this file under
  37  * the terms of any one of the MPL, the GPL or the LGPL.
  38  *
  39  * ***** END LICENSE BLOCK ***** */
  40
  41 /*
  42  * structs that contain the data provided by nsStyleContext, the
  43  * internal API for computed style data for an element
  44  */
  45
  46 #include "nsStyleStruct.h"
  47 #include "nsStyleStructInlines.h"
  48 #include "nsStyleConsts.h"
  49 #include "nsThemeConstants.h"
  50 #include "nsString.h"
  51 #include "nsPresContext.h"
  52 #include "nsIDeviceContext.h"
  53 #include "nsIStyleRule.h"
  54 #include "nsCRT.h"
  55
  56 #include "nsCOMPtr.h"
  57 #include "nsIPresShell.h"
  58 #include "nsIFrame.h"
  59 #include "nsHTMLReflowState.h"
  60 #include "prenv.h"
  61
  62 #include "nsBidiUtils.h"
  63
  64 #include "imgIRequest.h"
  65 #include "prlog.h"
  66
  67 // Make sure we have enough bits in NS_STYLE_INHERIT_MASK.
  68 PR_STATIC_ASSERT((((1 << nsStyleStructID_Length) - 1) &
  69                   ~(NS_STYLE_INHERIT_MASK)) == 0);
  70
  71 inline PRBool IsFixedUnit(nsStyleUnit aUnit, PRBool aEnumOK)
  72 {
  73   return PRBool((aUnit == eStyleUnit_Coord) ||
  74                 (aEnumOK && (aUnit == eStyleUnit_Enumerated)));
  75 }
  76
  77 static PRBool EqualURIs(nsIURI *aURI1, nsIURI *aURI2)
  78 {
  79   PRBool eq;
  80   return aURI1 == aURI2 ||    // handle null==null, and optimize
  81          (aURI1 && aURI2 &&
  82           NS_SUCCEEDED(aURI1->Equals(aURI2, &eq)) && // not equal on fail
  83           eq);
  84 }
  85
  86 static PRBool EqualURIs(nsCSSValue::URL *aURI1, nsCSSValue::URL *aURI2)
  87 {
  88   return aURI1 == aURI2 ||    // handle null==null, and optimize
  89          (aURI1 && aURI2 && aURI1->URIEquals(*aURI2));
  90 }
  91
  92 static PRBool EqualImages(imgIRequest *aImage1, imgIRequest* aImage2)
  93 {
  94   if (aImage1 == aImage2) {
  95     return PR_TRUE;
  96   }
  97
  98   if (!aImage1 || !aImage2) {
  99     return PR_FALSE;
 100   }
 101
 102   nsCOMPtr<nsIURI> uri1, uri2;
 103   aImage1->GetURI(getter_AddRefs(uri1));
 104   aImage2->GetURI(getter_AddRefs(uri2));
 105   return EqualURIs(uri1, uri2);
 106 }
 107
 108 static nsChangeHint CalcShadowDifference(nsCSSShadowArray* lhs,
 109                                          nsCSSShadowArray* rhs);
 110
 111 // --------------------
 112 // nsStyleFont
 113 //
 114 nsStyleFont::nsStyleFont(const nsFont& aFont, nsPresContext *aPresContext)
 115   : mFont(aFont),
 116     mGenericID(kGenericFont_NONE)
 117 {
 118   mSize = mFont.size = nsStyleFont::ZoomText(aPresContext, mFont.size);
 119 #ifdef MOZ_MATHML
 120   mScriptUnconstrainedSize = mSize;
 121   mScriptMinSize = aPresContext->TwipsToAppUnits(
 122       NS_POINTS_TO_TWIPS(NS_MATHML_DEFAULT_SCRIPT_MIN_SIZE_PT));
 123   mScriptLevel = 0;
 124   mScriptSizeMultiplier = NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER;
 125 #endif
 126 }
 127
 128 nsStyleFont::nsStyleFont(const nsStyleFont& aSrc)
 129   : mFont(aSrc.mFont)
 130   , mSize(aSrc.mSize)
 131   , mGenericID(aSrc.mGenericID)
 132 #ifdef MOZ_MATHML
 133   , mScriptLevel(aSrc.mScriptLevel)
 134   , mScriptUnconstrainedSize(aSrc.mScriptUnconstrainedSize)
 135   , mScriptMinSize(aSrc.mScriptMinSize)
 136   , mScriptSizeMultiplier(aSrc.mScriptSizeMultiplier)
 137 #endif
 138 {
 139 }
 140
 141 nsStyleFont::nsStyleFont(nsPresContext* aPresContext)
 142   : mFont(*(aPresContext->GetDefaultFont(kPresContext_DefaultVariableFont_ID))),
 143     mGenericID(kGenericFont_NONE)
 144 {
 145   mSize = mFont.size = nsStyleFont::ZoomText(aPresContext, mFont.size);
 146 #ifdef MOZ_MATHML
 147   mScriptUnconstrainedSize = mSize;
 148   mScriptMinSize = aPresContext->TwipsToAppUnits(
 149       NS_POINTS_TO_TWIPS(NS_MATHML_DEFAULT_SCRIPT_MIN_SIZE_PT));
 150   mScriptLevel = 0;
 151   mScriptSizeMultiplier = NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER;
 152 #endif
 153 }
 154
 155 void*
 156 nsStyleFont::operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
 157   void* result = aContext->AllocateFromShell(sz);
 158   if (result)
 159     memset(result, 0, sz);
 160   return result;
 161 }
 162
 163 void
 164 nsStyleFont::Destroy(nsPresContext* aContext) {
 165   this->~nsStyleFont();
 166   aContext->FreeToShell(sizeof(nsStyleFont), this);
 167 }
 168
 169 nsChangeHint nsStyleFont::CalcDifference(const nsStyleFont& aOther) const
 170 {
 171   if (mSize == aOther.mSize) {
 172     return CalcFontDifference(mFont, aOther.mFont);
 173   }
 174   return NS_STYLE_HINT_REFLOW;
 175 }
 176
 177 #ifdef DEBUG
 178 /* static */
 179 nsChangeHint nsStyleFont::MaxDifference()
 180 {
 181   return NS_STYLE_HINT_REFLOW;
 182 }
 183 #endif
 184
 185 /* static */ nscoord
 186 nsStyleFont::ZoomText(nsPresContext *aPresContext, nscoord aSize)
 187 {
 188   return nscoord(float(aSize) * aPresContext->TextZoom());
 189 }
 190
 191 /* static */ nscoord
 192 nsStyleFont::UnZoomText(nsPresContext *aPresContext, nscoord aSize)
 193 {
 194   return nscoord(float(aSize) / aPresContext->TextZoom());
 195 }
 196
 197 nsChangeHint nsStyleFont::CalcFontDifference(const nsFont& aFont1, const nsFont& aFont2)
 198 {
 199   if ((aFont1.size == aFont2.size) &&
 200       (aFont1.sizeAdjust == aFont2.sizeAdjust) &&
 201       (aFont1.style == aFont2.style) &&
 202       (aFont1.variant == aFont2.variant) &&
 203       (aFont1.familyNameQuirks == aFont2.familyNameQuirks) &&
 204       (aFont1.weight == aFont2.weight) &&
 205       (aFont1.name == aFont2.name)) {
 206     if ((aFont1.decorations == aFont2.decorations)) {
 207       return NS_STYLE_HINT_NONE;
 208     }
 209     return NS_STYLE_HINT_VISUAL;
 210   }
 211   return NS_STYLE_HINT_REFLOW;
 212 }
 213
 214 static PRBool IsFixedData(const nsStyleSides& aSides, PRBool aEnumOK)
 215 {
 216   NS_FOR_CSS_SIDES(side) {
 217     if (!IsFixedUnit(aSides.GetUnit(side), aEnumOK))
 218       return PR_FALSE;
 219   }
 220   return PR_TRUE;
 221 }
 222
 223 static nscoord CalcCoord(const nsStyleCoord& aCoord,
 224                          const nscoord* aEnumTable,
 225                          PRInt32 aNumEnums)
 226 {
 227   switch (aCoord.GetUnit()) {
 228     case eStyleUnit_Coord:
 229       return aCoord.GetCoordValue();
 230     case eStyleUnit_Enumerated:
 231       if (nsnull != aEnumTable) {
 232         PRInt32 value = aCoord.GetIntValue();
 233         if ((0 <= value) && (value < aNumEnums)) {
 234           return aEnumTable[aCoord.GetIntValue()];
 235         }
 236       }
 237       break;
 238     default:
 239       NS_ERROR("bad unit type");
 240       break;
 241   }
 242   return 0;
 243 }
 244
 245 nsStyleMargin::nsStyleMargin() {
 246   nsStyleCoord zero(0);
 247   NS_FOR_CSS_SIDES(side) {
 248     mMargin.Set(side, zero);
 249   }
 250   mHasCachedMargin = PR_FALSE;
 251 }
 252
 253 nsStyleMargin::nsStyleMargin(const nsStyleMargin& aSrc) {
 254   mMargin = aSrc.mMargin;
 255   mHasCachedMargin = PR_FALSE;
 256 }
 257
 258 void*
 259 nsStyleMargin::operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
 260   void* result = aContext->AllocateFromShell(sz);
 261   if (result)
 262     memset(result, 0, sz);
 263   return result;
 264 }
 265
 266 void
 267 nsStyleMargin::Destroy(nsPresContext* aContext) {
 268   this->~nsStyleMargin();
 269   aContext->FreeToShell(sizeof(nsStyleMargin), this);
 270 }
 271
 272
 273 void nsStyleMargin::RecalcData()
 274 {
 275   if (IsFixedData(mMargin, PR_FALSE)) {
 276     NS_FOR_CSS_SIDES(side) {
 277       mCachedMargin.side(side) = CalcCoord(mMargin.Get(side), nsnull, 0);
 278     }
 279     mHasCachedMargin = PR_TRUE;
 280   }
 281   else
 282     mHasCachedMargin = PR_FALSE;
 283 }
 284
 285 nsChangeHint nsStyleMargin::CalcDifference(const nsStyleMargin& aOther) const
 286 {
 287   if (mMargin == aOther.mMargin) {
 288     return NS_STYLE_HINT_NONE;
 289   }
 290   return NS_STYLE_HINT_REFLOW;
 291 }
 292
 293 #ifdef DEBUG
 294 /* static */
 295 nsChangeHint nsStyleMargin::MaxDifference()
 296 {
 297   return NS_STYLE_HINT_REFLOW;
 298 }
 299 #endif
 300
 301 nsStylePadding::nsStylePadding() {
 302   nsStyleCoord zero(0);
 303   NS_FOR_CSS_SIDES(side) {
 304     mPadding.Set(side, zero);
 305   }
 306   mHasCachedPadding = PR_FALSE;
 307 }
 308
 309 nsStylePadding::nsStylePadding(const nsStylePadding& aSrc) {
 310   mPadding = aSrc.mPadding;
 311   mHasCachedPadding = PR_FALSE;
 312 }
 313
 314 void*
 315 nsStylePadding::operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
 316   void* result = aContext->AllocateFromShell(sz);
 317   if (result)
 318     memset(result, 0, sz);
 319   return result;
 320 }
 321
 322 void
 323 nsStylePadding::Destroy(nsPresContext* aContext) {
 324   this->~nsStylePadding();
 325   aContext->FreeToShell(sizeof(nsStylePadding), this);
 326 }
 327
 328 void nsStylePadding::RecalcData()
 329 {
 330   if (IsFixedData(mPadding, PR_FALSE)) {
 331     NS_FOR_CSS_SIDES(side) {
 332       mCachedPadding.side(side) = CalcCoord(mPadding.Get(side), nsnull, 0);
 333     }
 334     mHasCachedPadding = PR_TRUE;
 335   }
 336   else
 337     mHasCachedPadding = PR_FALSE;
 338 }
 339
 340 nsChangeHint nsStylePadding::CalcDifference(const nsStylePadding& aOther) const
 341 {
 342   if (mPadding == aOther.mPadding) {
 343     return NS_STYLE_HINT_NONE;
 344   }
 345   return NS_STYLE_HINT_REFLOW;
 346 }
 347
 348 #ifdef DEBUG
 349 /* static */
 350 nsChangeHint nsStylePadding::MaxDifference()
 351 {
 352   return NS_STYLE_HINT_REFLOW;
 353 }
 354 #endif
 355
 356 nsStyleBorder::nsStyleBorder(nsPresContext* aPresContext)
 357   : mHaveBorderImageWidth(PR_FALSE),
 358     mComputedBorder(0, 0, 0, 0),
 359     mBorderImage(nsnull)
 360 {
 361   nscoord medium =
 362     (aPresContext->GetBorderWidthTable())[NS_STYLE_BORDER_WIDTH_MEDIUM];
 363   NS_FOR_CSS_SIDES(side) {
 364     mBorder.side(side) = medium;
 365     mBorderStyle[side] = NS_STYLE_BORDER_STYLE_NONE | BORDER_COLOR_FOREGROUND;
 366     mBorderColor[side] = NS_RGB(0, 0, 0);
 367   }
 368   NS_FOR_CSS_HALF_CORNERS(corner) {
 369     mBorderRadius.Set(corner, nsStyleCoord(0));
 370   }
 371
 372   mBorderColors = nsnull;
 373   mBoxShadow = nsnull;
 374
 375   mFloatEdge = NS_STYLE_FLOAT_EDGE_CONTENT;
 376
 377   mTwipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
 378 }
 379
 380 nsBorderColors::~nsBorderColors()
 381 {
 382   NS_CSS_DELETE_LIST_MEMBER(nsBorderColors, this, mNext);
 383 }
 384
 385 nsBorderColors*
 386 nsBorderColors::Clone(PRBool aDeep) const
 387 {
 388   nsBorderColors* result = new nsBorderColors(mColor);
 389   if (NS_UNLIKELY(!result))
 390     return result;
 391   if (aDeep)
 392     NS_CSS_CLONE_LIST_MEMBER(nsBorderColors, this, mNext, result, (PR_FALSE));
 393   return result;
 394 }
 395
 396 nsStyleBorder::nsStyleBorder(const nsStyleBorder& aSrc)
 397   : mBorderRadius(aSrc.mBorderRadius),
 398     mBorderImageSplit(aSrc.mBorderImageSplit),
 399     mFloatEdge(aSrc.mFloatEdge),
 400     mBorderImageHFill(aSrc.mBorderImageHFill),
 401     mBorderImageVFill(aSrc.mBorderImageVFill),
 402     mBorderColors(nsnull),
 403     mBoxShadow(aSrc.mBoxShadow),
 404     mHaveBorderImageWidth(aSrc.mHaveBorderImageWidth),
 405     mBorderImageWidth(aSrc.mBorderImageWidth),
 406     mComputedBorder(aSrc.mComputedBorder),
 407     mBorder(aSrc.mBorder),
 408     mBorderImage(aSrc.mBorderImage),
 409     mTwipsPerPixel(aSrc.mTwipsPerPixel)
 410 {
 411   if (aSrc.mBorderColors) {
 412     EnsureBorderColors();
 413     for (PRInt32 i = 0; i < 4; i++)
 414       if (aSrc.mBorderColors[i])
 415         mBorderColors[i] = aSrc.mBorderColors[i]->Clone();
 416       else
 417         mBorderColors[i] = nsnull;
 418   }
 419
 420   NS_FOR_CSS_SIDES(side) {
 421     mBorderStyle[side] = aSrc.mBorderStyle[side];
 422     mBorderColor[side] = aSrc.mBorderColor[side];
 423   }
 424   NS_FOR_CSS_HALF_CORNERS(corner) {
 425     mBorderRadius.Set(corner, aSrc.mBorderRadius.Get(corner));
 426   }
 427 }
 428
 429 nsStyleBorder::~nsStyleBorder()
 430 {
 431   if (mBorderColors) {
 432     for (PRInt32 i = 0; i < 4; i++)
 433       delete mBorderColors[i];
 434     delete [] mBorderColors;
 435   }
 436 }
 437
 438 void*
 439 nsStyleBorder::operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
 440   void* result = aContext->AllocateFromShell(sz);
 441   if (result)
 442     memset(result, 0, sz);
 443   return result;
 444 }
 445
 446 void
 447 nsStyleBorder::Destroy(nsPresContext* aContext) {
 448   this->~nsStyleBorder();
 449   aContext->FreeToShell(sizeof(nsStyleBorder), this);
 450 }
 451
 452
 453 nsChangeHint nsStyleBorder::CalcDifference(const nsStyleBorder& aOther) const
 454 {
 455   // Note that differences in mBorder don't affect rendering (which should only
 456   // use mComputedBorder), so don't need to be tested for here.
 457   if (mTwipsPerPixel == aOther.mTwipsPerPixel &&
 458       GetActualBorder() == aOther.GetActualBorder() &&
 459       mFloatEdge == aOther.mFloatEdge) {
 460     // Note that mBorderStyle stores not only the border style but also
 461     // color-related flags.  Given that we've already done an mComputedBorder
 462     // comparison, border-style differences can only lead to a VISUAL hint.  So
 463     // it's OK to just compare the values directly -- if either the actual
 464     // style or the color flags differ we want to repaint.
 465     NS_FOR_CSS_SIDES(ix) {
 466       if (mBorderStyle[ix] != aOther.mBorderStyle[ix] ||
 467           mBorderColor[ix] != aOther.mBorderColor[ix]) {
 468         return NS_STYLE_HINT_VISUAL;
 469       }
 470     }
 471
 472     if (mBorderRadius != aOther.mBorderRadius ||
 473         !mBorderColors != !aOther.mBorderColors) {
 474       return NS_STYLE_HINT_VISUAL;
 475     }
 476
 477     if (IsBorderImageLoaded() || aOther.IsBorderImageLoaded()) {
 478       if (mBorderImage != aOther.mBorderImage ||
 479           mBorderImageHFill != aOther.mBorderImageHFill ||
 480           mBorderImageVFill != aOther.mBorderImageVFill ||
 481           mBorderImageSplit != aOther.mBorderImageSplit) {
 482         return NS_STYLE_HINT_VISUAL;
 483       }
 484       // The call to GetActualBorder above already considered
 485       // mBorderImageWidth and mHaveBorderImageWidth.
 486     }
 487
 488     // Note that at this point if mBorderColors is non-null so is
 489     // aOther.mBorderColors
 490     if (mBorderColors) {
 491       NS_FOR_CSS_SIDES(ix) {
 492         if (!nsBorderColors::Equal(mBorderColors[ix],
 493                                    aOther.mBorderColors[ix])) {
 494           return NS_STYLE_HINT_VISUAL;
 495         }
 496       }
 497     }
 498
 499     // Decide what to do with regards to box-shadow
 500     return CalcShadowDifference(mBoxShadow, aOther.mBoxShadow);
 501   }
 502   return NS_STYLE_HINT_REFLOW;
 503 }
 504
 505 #ifdef DEBUG
 506 /* static */
 507 nsChangeHint nsStyleBorder::MaxDifference()
 508 {
 509   return NS_STYLE_HINT_REFLOW;
 510 }
 511 #endif
 512
 513 PRBool
 514 nsStyleBorder::ImageBorderDiffers() const
 515 {
 516   return mComputedBorder !=
 517            (mHaveBorderImageWidth ? mBorderImageWidth : mBorder);
 518 }
 519
 520 const nsMargin&
 521 nsStyleBorder::GetActualBorder() const
 522 {
 523   if (IsBorderImageLoaded())
 524     if (mHaveBorderImageWidth)
 525       return mBorderImageWidth;
 526     else
 527       return mBorder;
 528   else
 529     return mComputedBorder;
 530 }
 531
 532 nsStyleOutline::nsStyleOutline(nsPresContext* aPresContext)
 533 {
 534   // spacing values not inherited
 535   nsStyleCoord zero(0);
 536   NS_FOR_CSS_HALF_CORNERS(corner) {
 537     mOutlineRadius.Set(corner, zero);
 538   }
 539
 540   mOutlineOffset = 0;
 541
 542   mOutlineWidth = nsStyleCoord(NS_STYLE_BORDER_WIDTH_MEDIUM, eStyleUnit_Enumerated);
 543   mOutlineStyle = NS_STYLE_BORDER_STYLE_NONE;
 544   mOutlineColor = NS_RGB(0, 0, 0);
 545
 546   mHasCachedOutline = PR_FALSE;
 547   mTwipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
 548 }
 549
 550 nsStyleOutline::nsStyleOutline(const nsStyleOutline& aSrc) {
 551   memcpy((nsStyleOutline*)this, &aSrc, sizeof(nsStyleOutline));
 552 }
 553
 554 void
 555 nsStyleOutline::RecalcData(nsPresContext* aContext)
 556 {
 557   if (NS_STYLE_BORDER_STYLE_NONE == GetOutlineStyle()) {
 558     mCachedOutlineWidth = 0;
 559     mHasCachedOutline = PR_TRUE;
 560   } else if (IsFixedUnit(mOutlineWidth.GetUnit(), PR_TRUE)) {
 561     mCachedOutlineWidth =
 562       CalcCoord(mOutlineWidth, aContext->GetBorderWidthTable(), 3);
 563     mCachedOutlineWidth =
 564       NS_ROUND_BORDER_TO_PIXELS(mCachedOutlineWidth, mTwipsPerPixel);
 565     mHasCachedOutline = PR_TRUE;
 566   }
 567   else
 568     mHasCachedOutline = PR_FALSE;
 569 }
 570
 571 nsChangeHint nsStyleOutline::CalcDifference(const nsStyleOutline& aOther) const
 572 {
 573   PRBool outlineWasVisible =
 574     mCachedOutlineWidth > 0 && mOutlineStyle != NS_STYLE_BORDER_STYLE_NONE;
 575   PRBool outlineIsVisible =
 576     aOther.mCachedOutlineWidth > 0 && aOther.mOutlineStyle != NS_STYLE_BORDER_STYLE_NONE;
 577   if (outlineWasVisible != outlineIsVisible ||
 578       (outlineIsVisible && (mOutlineOffset != aOther.mOutlineOffset ||
 579                             mOutlineWidth != aOther.mOutlineWidth ||
 580                             mTwipsPerPixel != aOther.mTwipsPerPixel))) {
 581     return NS_CombineHint(nsChangeHint_ReflowFrame, nsChangeHint_RepaintFrame);
 582   }
 583   if ((mOutlineStyle != aOther.mOutlineStyle) ||
 584       (mOutlineColor != aOther.mOutlineColor) ||
 585       (mOutlineRadius != aOther.mOutlineRadius)) {
 586     return nsChangeHint_RepaintFrame;
 587   }
 588   return NS_STYLE_HINT_NONE;
 589 }
 590
 591 #ifdef DEBUG
 592 /* static */
 593 nsChangeHint nsStyleOutline::MaxDifference()
 594 {
 595   return NS_CombineHint(nsChangeHint_ReflowFrame, nsChangeHint_RepaintFrame);
 596 }
 597 #endif
 598
 599 // --------------------
 600 // nsStyleList
 601 //
 602 nsStyleList::nsStyleList()
 603   : mListStyleType(NS_STYLE_LIST_STYLE_DISC),
 604     mListStylePosition(NS_STYLE_LIST_STYLE_POSITION_OUTSIDE)
 605 {
 606 }
 607
 608 nsStyleList::~nsStyleList()
 609 {
 610 }
 611
 612 nsStyleList::nsStyleList(const nsStyleList& aSource)
 613   : mListStyleType(aSource.mListStyleType),
 614     mListStylePosition(aSource.mListStylePosition),
 615     mListStyleImage(aSource.mListStyleImage),
 616     mImageRegion(aSource.mImageRegion)
 617 {
 618 }
 619
 620 nsChangeHint nsStyleList::CalcDifference(const nsStyleList& aOther) const
 621 {
 622   if (mListStylePosition != aOther.mListStylePosition)
 623     return NS_STYLE_HINT_FRAMECHANGE;
 624   if (EqualImages(mListStyleImage, aOther.mListStyleImage) &&
 625       mListStyleType == aOther.mListStyleType) {
 626     if (mImageRegion == aOther.mImageRegion)
 627       return NS_STYLE_HINT_NONE;
 628     if (mImageRegion.width == aOther.mImageRegion.width &&
 629         mImageRegion.height == aOther.mImageRegion.height)
 630       return NS_STYLE_HINT_VISUAL;
 631   }
 632   return NS_STYLE_HINT_REFLOW;
 633 }
 634
 635 #ifdef DEBUG
 636 /* static */
 637 nsChangeHint nsStyleList::MaxDifference()
 638 {
 639   return NS_STYLE_HINT_FRAMECHANGE;
 640 }
 641 #endif
 642
 643 // --------------------
 644 // nsStyleXUL
 645 //
 646 nsStyleXUL::nsStyleXUL()
 647 {
 648   mBoxAlign  = NS_STYLE_BOX_ALIGN_STRETCH;
 649   mBoxDirection = NS_STYLE_BOX_DIRECTION_NORMAL;
 650   mBoxFlex = 0.0f;
 651   mBoxOrient = NS_STYLE_BOX_ORIENT_HORIZONTAL;
 652   mBoxPack   = NS_STYLE_BOX_PACK_START;
 653   mBoxOrdinal = 1;
 654   mStretchStack = PR_TRUE;
 655 }
 656
 657 nsStyleXUL::~nsStyleXUL()
 658 {
 659 }
 660
 661 nsStyleXUL::nsStyleXUL(const nsStyleXUL& aSource)
 662 {
 663   memcpy((nsStyleXUL*)this, &aSource, sizeof(nsStyleXUL));
 664 }
 665
 666 nsChangeHint nsStyleXUL::CalcDifference(const nsStyleXUL& aOther) const
 667 {
 668   if (mBoxAlign == aOther.mBoxAlign &&
 669       mBoxDirection == aOther.mBoxDirection &&
 670       mBoxFlex == aOther.mBoxFlex &&
 671       mBoxOrient == aOther.mBoxOrient &&
 672       mBoxPack == aOther.mBoxPack &&
 673       mBoxOrdinal == aOther.mBoxOrdinal)
 674     return NS_STYLE_HINT_NONE;
 675   if (mBoxOrdinal != aOther.mBoxOrdinal)
 676     return NS_STYLE_HINT_FRAMECHANGE;
 677   return NS_STYLE_HINT_REFLOW;
 678 }
 679
 680 #ifdef DEBUG
 681 /* static */
 682 nsChangeHint nsStyleXUL::MaxDifference()
 683 {
 684   return NS_STYLE_HINT_FRAMECHANGE;
 685 }
 686 #endif
 687
 688 // --------------------
 689 // nsStyleColumn
 690 //
 691 nsStyleColumn::nsStyleColumn(nsPresContext* aPresContext)
 692 {
 693   mColumnCount = NS_STYLE_COLUMN_COUNT_AUTO;
 694   mColumnWidth.SetAutoValue();
 695   mColumnGap.SetNormalValue();
 696
 697   mColumnRuleWidth = (aPresContext->GetBorderWidthTable())[NS_STYLE_BORDER_WIDTH_MEDIUM];
 698   mColumnRuleStyle = NS_STYLE_BORDER_STYLE_NONE;
 699   mColumnRuleColor = NS_RGB(0, 0, 0);
 700   mColumnRuleColorIsForeground = PR_TRUE;
 701
 702   mTwipsPerPixel = aPresContext->AppUnitsPerDevPixel();
 703 }
 704
 705 nsStyleColumn::~nsStyleColumn()
 706 {
 707 }
 708
 709 nsStyleColumn::nsStyleColumn(const nsStyleColumn& aSource)
 710 {
 711   memcpy((nsStyleColumn*)this, &aSource, sizeof(nsStyleColumn));
 712 }
 713
 714 nsChangeHint nsStyleColumn::CalcDifference(const nsStyleColumn& aOther) const
 715 {
 716   if ((mColumnWidth.GetUnit() == eStyleUnit_Auto)
 717       != (aOther.mColumnWidth.GetUnit() == eStyleUnit_Auto) ||
 718       mColumnCount != aOther.mColumnCount)
 719     // We force column count changes to do a reframe, because it's tricky to handle
 720     // some edge cases where the column count gets smaller and content overflows.
 721     // XXX not ideal
 722     return NS_STYLE_HINT_FRAMECHANGE;
 723
 724   if (mColumnWidth != aOther.mColumnWidth ||
 725       mColumnGap != aOther.mColumnGap)
 726     return NS_STYLE_HINT_REFLOW;
 727
 728   if (GetComputedColumnRuleWidth() != aOther.GetComputedColumnRuleWidth() ||
 729       mColumnRuleStyle != aOther.mColumnRuleStyle ||
 730       mColumnRuleColor != aOther.mColumnRuleColor ||
 731       mColumnRuleColorIsForeground != aOther.mColumnRuleColorIsForeground)
 732     return NS_STYLE_HINT_VISUAL;
 733
 734   return NS_STYLE_HINT_NONE;
 735 }
 736
 737 #ifdef DEBUG
 738 /* static */
 739 nsChangeHint nsStyleColumn::MaxDifference()
 740 {
 741   return NS_STYLE_HINT_FRAMECHANGE;
 742 }
 743 #endif
 744
 745 #ifdef MOZ_SVG
 746 // --------------------
 747 // nsStyleSVG
 748 //
 749 nsStyleSVG::nsStyleSVG()
 750 {
 751     mFill.mType              = eStyleSVGPaintType_Color;
 752     mFill.mPaint.mColor      = NS_RGB(0,0,0);
 753     mFill.mFallbackColor     = NS_RGB(0,0,0);
 754     mStroke.mType            = eStyleSVGPaintType_None;
 755     mStroke.mPaint.mColor    = NS_RGB(0,0,0);
 756     mStroke.mFallbackColor   = NS_RGB(0,0,0);
 757     mStrokeDasharray         = nsnull;
 758
 759     mStrokeDashoffset.SetCoordValue(0);
 760     mStrokeWidth.SetCoordValue(nsPresContext::CSSPixelsToAppUnits(1));
 761
 762     mFillOpacity             = 1.0f;
 763     mStrokeMiterlimit        = 4.0f;
 764     mStrokeOpacity           = 1.0f;
 765
 766     mStrokeDasharrayLength   = 0;
 767     mClipRule                = NS_STYLE_FILL_RULE_NONZERO;
 768     mColorInterpolation      = NS_STYLE_COLOR_INTERPOLATION_SRGB;
 769     mColorInterpolationFilters = NS_STYLE_COLOR_INTERPOLATION_LINEARRGB;
 770     mFillRule                = NS_STYLE_FILL_RULE_NONZERO;
 771     mPointerEvents           = NS_STYLE_POINTER_EVENTS_VISIBLEPAINTED;
 772     mShapeRendering          = NS_STYLE_SHAPE_RENDERING_AUTO;
 773     mStrokeLinecap           = NS_STYLE_STROKE_LINECAP_BUTT;
 774     mStrokeLinejoin          = NS_STYLE_STROKE_LINEJOIN_MITER;
 775     mTextAnchor              = NS_STYLE_TEXT_ANCHOR_START;
 776     mTextRendering           = NS_STYLE_TEXT_RENDERING_AUTO;
 777 }
 778
 779 nsStyleSVG::~nsStyleSVG()
 780 {
 781   delete [] mStrokeDasharray;
 782 }
 783
 784 nsStyleSVG::nsStyleSVG(const nsStyleSVG& aSource)
 785 {
 786   //memcpy((nsStyleSVG*)this, &aSource, sizeof(nsStyleSVG));
 787
 788   mFill = aSource.mFill;
 789   mStroke = aSource.mStroke;
 790
 791   mMarkerEnd = aSource.mMarkerEnd;
 792   mMarkerMid = aSource.mMarkerMid;
 793   mMarkerStart = aSource.mMarkerStart;
 794
 795   mStrokeDasharrayLength = aSource.mStrokeDasharrayLength;
 796   if (aSource.mStrokeDasharray) {
 797     mStrokeDasharray = new nsStyleCoord[mStrokeDasharrayLength];
 798     if (mStrokeDasharray)
 799       memcpy(mStrokeDasharray,
 800              aSource.mStrokeDasharray,
 801              mStrokeDasharrayLength * sizeof(nsStyleCoord));
 802     else
 803       mStrokeDasharrayLength = 0;
 804   } else {
 805     mStrokeDasharray = nsnull;
 806   }
 807
 808   mStrokeDashoffset = aSource.mStrokeDashoffset;
 809   mStrokeWidth = aSource.mStrokeWidth;
 810
 811   mFillOpacity = aSource.mFillOpacity;
 812   mStrokeMiterlimit = aSource.mStrokeMiterlimit;
 813   mStrokeOpacity = aSource.mStrokeOpacity;
 814
 815   mClipRule = aSource.mClipRule;
 816   mColorInterpolation = aSource.mColorInterpolation;
 817   mColorInterpolationFilters = aSource.mColorInterpolationFilters;
 818   mFillRule = aSource.mFillRule;
 819   mPointerEvents = aSource.mPointerEvents;
 820   mShapeRendering = aSource.mShapeRendering;
 821   mStrokeLinecap = aSource.mStrokeLinecap;
 822   mStrokeLinejoin = aSource.mStrokeLinejoin;
 823   mTextAnchor = aSource.mTextAnchor;
 824   mTextRendering = aSource.mTextRendering;
 825 }
 826
 827 static PRBool PaintURIChanged(const nsStyleSVGPaint& aPaint1,
 828                               const nsStyleSVGPaint& aPaint2)
 829 {
 830   if (aPaint1.mType != aPaint2.mType) {
 831     return aPaint1.mType == eStyleSVGPaintType_Server ||
 832            aPaint2.mType == eStyleSVGPaintType_Server;
 833   }
 834   return aPaint1.mType == eStyleSVGPaintType_Server &&
 835     !EqualURIs(aPaint1.mPaint.mPaintServer, aPaint2.mPaint.mPaintServer);
 836 }
 837
 838 nsChangeHint nsStyleSVG::CalcDifference(const nsStyleSVG& aOther) const
 839 {
 840   nsChangeHint hint = nsChangeHint(0);
 841
 842   if (mTextRendering != aOther.mTextRendering) {
 843     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
 844     // May be needed for non-svg frames
 845     NS_UpdateHint(hint, nsChangeHint_ReflowFrame);
 846   }
 847
 848   if (mFill != aOther.mFill ||
 849       mStroke != aOther.mStroke) {
 850     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
 851     if (PaintURIChanged(mFill, aOther.mFill) ||
 852         PaintURIChanged(mStroke, aOther.mStroke)) {
 853       NS_UpdateHint(hint, nsChangeHint_UpdateEffects);
 854     }
 855     // Nothing more to do, below we can only set "repaint"
 856     return hint;
 857   }
 858
 859   if ( !EqualURIs(mMarkerEnd, aOther.mMarkerEnd)               ||
 860        !EqualURIs(mMarkerMid, aOther.mMarkerMid)               ||
 861        !EqualURIs(mMarkerStart, aOther.mMarkerStart)           ||
 862
 863        mStrokeDashoffset      != aOther.mStrokeDashoffset      ||
 864        mStrokeWidth           != aOther.mStrokeWidth           ||
 865
 866        mFillOpacity           != aOther.mFillOpacity           ||
 867        mStrokeMiterlimit      != aOther.mStrokeMiterlimit      ||
 868        mStrokeOpacity         != aOther.mStrokeOpacity         ||
 869
 870        mClipRule              != aOther.mClipRule              ||
 871        mColorInterpolation    != aOther.mColorInterpolation    ||
 872        mColorInterpolationFilters != aOther.mColorInterpolationFilters ||
 873        mFillRule              != aOther.mFillRule              ||
 874        mShapeRendering        != aOther.mShapeRendering        ||
 875        mStrokeDasharrayLength != aOther.mStrokeDasharrayLength ||
 876        mStrokeLinecap         != aOther.mStrokeLinecap         ||
 877        mStrokeLinejoin        != aOther.mStrokeLinejoin        ||
 878        mTextAnchor            != aOther.mTextAnchor) {
 879     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
 880     return hint;
 881   }
 882
 883   // length of stroke dasharrays are the same (tested above) - check entries
 884   for (PRUint32 i=0; i<mStrokeDasharrayLength; i++)
 885     if (mStrokeDasharray[i] != aOther.mStrokeDasharray[i]) {
 886       NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
 887       return hint;
 888     }
 889
 890   return hint;
 891 }
 892
 893 #ifdef DEBUG
 894 /* static */
 895 nsChangeHint nsStyleSVG::MaxDifference()
 896 {
 897   return NS_CombineHint(NS_CombineHint(nsChangeHint_UpdateEffects,
 898                                        nsChangeHint_ReflowFrame),
 899                                        nsChangeHint_RepaintFrame);
 900 }
 901 #endif
 902
 903 // --------------------
 904 // nsStyleSVGReset
 905 //
 906 nsStyleSVGReset::nsStyleSVGReset()
 907 {
 908     mStopColor               = NS_RGB(0,0,0);
 909     mFloodColor              = NS_RGB(0,0,0);
 910     mLightingColor           = NS_RGB(255,255,255);
 911     mClipPath                = nsnull;
 912     mFilter                  = nsnull;
 913     mMask                    = nsnull;
 914     mStopOpacity             = 1.0f;
 915     mFloodOpacity            = 1.0f;
 916     mDominantBaseline        = NS_STYLE_DOMINANT_BASELINE_AUTO;
 917 }
 918
 919 nsStyleSVGReset::~nsStyleSVGReset()
 920 {
 921 }
 922
 923 nsStyleSVGReset::nsStyleSVGReset(const nsStyleSVGReset& aSource)
 924 {
 925   mStopColor = aSource.mStopColor;
 926   mFloodColor = aSource.mFloodColor;
 927   mLightingColor = aSource.mLightingColor;
 928   mClipPath = aSource.mClipPath;
 929   mFilter = aSource.mFilter;
 930   mMask = aSource.mMask;
 931   mStopOpacity = aSource.mStopOpacity;
 932   mFloodOpacity = aSource.mFloodOpacity;
 933   mDominantBaseline = aSource.mDominantBaseline;
 934 }
 935
 936 nsChangeHint nsStyleSVGReset::CalcDifference(const nsStyleSVGReset& aOther) const
 937 {
 938   nsChangeHint hint = nsChangeHint(0);
 939
 940   if (!EqualURIs(mClipPath, aOther.mClipPath) ||
 941       !EqualURIs(mFilter, aOther.mFilter)     ||
 942       !EqualURIs(mMask, aOther.mMask)) {
 943     NS_UpdateHint(hint, nsChangeHint_UpdateEffects);
 944     NS_UpdateHint(hint, nsChangeHint_ReflowFrame);
 945     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
 946   } else if (mStopColor        != aOther.mStopColor     ||
 947              mFloodColor       != aOther.mFloodColor    ||
 948              mLightingColor    != aOther.mLightingColor ||
 949              mStopOpacity      != aOther.mStopOpacity   ||
 950              mFloodOpacity     != aOther.mFloodOpacity  ||
 951              mDominantBaseline != aOther.mDominantBaseline)
 952     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
 953
 954   return hint;
 955 }
 956
 957 #ifdef DEBUG
 958 /* static */
 959 nsChangeHint nsStyleSVGReset::MaxDifference()
 960 {
 961   return NS_CombineHint(NS_CombineHint(nsChangeHint_UpdateEffects,
 962                                        nsChangeHint_ReflowFrame),
 963                                        nsChangeHint_RepaintFrame);
 964 }
 965 #endif
 966
 967 // nsStyleSVGPaint implementation
 968 nsStyleSVGPaint::~nsStyleSVGPaint()
 969 {
 970   if (mType == eStyleSVGPaintType_Server) {
 971     NS_IF_RELEASE(mPaint.mPaintServer);
 972   }
 973 }
 974
 975 void
 976 nsStyleSVGPaint::SetType(nsStyleSVGPaintType aType)
 977 {
 978   if (mType == eStyleSVGPaintType_Server) {
 979     this->~nsStyleSVGPaint();
 980     new (this) nsStyleSVGPaint();
 981   }
 982   mType = aType;
 983 }
 984
 985 nsStyleSVGPaint& nsStyleSVGPaint::operator=(const nsStyleSVGPaint& aOther)
 986 {
 987   if (this == &aOther)
 988     return *this;
 989
 990   SetType(aOther.mType);
 991
 992   mFallbackColor = aOther.mFallbackColor;
 993   if (mType == eStyleSVGPaintType_Server) {
 994     mPaint.mPaintServer = aOther.mPaint.mPaintServer;
 995     NS_IF_ADDREF(mPaint.mPaintServer);
 996   } else {
 997     mPaint.mColor = aOther.mPaint.mColor;
 998   }
 999   return *this;
1000 }
1001
1002 PRBool nsStyleSVGPaint::operator==(const nsStyleSVGPaint& aOther) const
1003 {
1004   if (mType != aOther.mType)
1005     return PR_FALSE;
1006   if (mType == eStyleSVGPaintType_Server)
1007     return EqualURIs(mPaint.mPaintServer, aOther.mPaint.mPaintServer) &&
1008            mFallbackColor == aOther.mFallbackColor;
1009   if (mType == eStyleSVGPaintType_None)
1010     return PR_TRUE;
1011   return mPaint.mColor == aOther.mPaint.mColor;
1012 }
1013
1014 #endif // MOZ_SVG
1015
1016
1017 // --------------------
1018 // nsStylePosition
1019 //
1020 nsStylePosition::nsStylePosition(void)
1021 {
1022   // positioning values not inherited
1023   nsStyleCoord  autoCoord(eStyleUnit_Auto);
1024   mOffset.SetLeft(autoCoord);
1025   mOffset.SetTop(autoCoord);
1026   mOffset.SetRight(autoCoord);
1027   mOffset.SetBottom(autoCoord);
1028   mWidth.SetAutoValue();
1029   mMinWidth.SetCoordValue(0);
1030   mMaxWidth.SetNoneValue();
1031   mHeight.SetAutoValue();
1032   mMinHeight.SetCoordValue(0);
1033   mMaxHeight.SetNoneValue();
1034   mBoxSizing = NS_STYLE_BOX_SIZING_CONTENT;
1035   mZIndex.SetAutoValue();
1036 }
1037
1038 nsStylePosition::~nsStylePosition(void)
1039 {
1040 }
1041
1042 nsStylePosition::nsStylePosition(const nsStylePosition& aSource)
1043 {
1044   memcpy((nsStylePosition*)this, &aSource, sizeof(nsStylePosition));
1045 }
1046
1047 nsChangeHint nsStylePosition::CalcDifference(const nsStylePosition& aOther) const
1048 {
1049   if (mZIndex != aOther.mZIndex) {
1050     return NS_STYLE_HINT_REFLOW;
1051   }
1052
1053   if ((mOffset == aOther.mOffset) &&
1054       (mWidth == aOther.mWidth) &&
1055       (mMinWidth == aOther.mMinWidth) &&
1056       (mMaxWidth == aOther.mMaxWidth) &&
1057       (mHeight == aOther.mHeight) &&
1058       (mMinHeight == aOther.mMinHeight) &&
1059       (mMaxHeight == aOther.mMaxHeight) &&
1060       (mBoxSizing == aOther.mBoxSizing))
1061     return NS_STYLE_HINT_NONE;
1062
1063   return nsChangeHint_ReflowFrame;
1064 }
1065
1066 #ifdef DEBUG
1067 /* static */
1068 nsChangeHint nsStylePosition::MaxDifference()
1069 {
1070   return NS_STYLE_HINT_REFLOW;
1071 }
1072 #endif
1073
1074 // --------------------
1075 // nsStyleTable
1076 //
1077
1078 nsStyleTable::nsStyleTable()
1079 {
1080   // values not inherited
1081   mLayoutStrategy = NS_STYLE_TABLE_LAYOUT_AUTO;
1082   mCols  = NS_STYLE_TABLE_COLS_NONE;
1083   mFrame = NS_STYLE_TABLE_FRAME_NONE;
1084   mRules = NS_STYLE_TABLE_RULES_NONE;
1085   mSpan = 1;
1086 }
1087
1088 nsStyleTable::~nsStyleTable(void)
1089 {
1090 }
1091
1092 nsStyleTable::nsStyleTable(const nsStyleTable& aSource)
1093 {
1094   memcpy((nsStyleTable*)this, &aSource, sizeof(nsStyleTable));
1095 }
1096
1097 nsChangeHint nsStyleTable::CalcDifference(const nsStyleTable& aOther) const
1098 {
1099   // Changes in mRules may require reframing (if border-collapse stuff changes, for example).
1100   if (mRules != aOther.mRules || mSpan != aOther.mSpan ||
1101       mLayoutStrategy != aOther.mLayoutStrategy)
1102     return NS_STYLE_HINT_FRAMECHANGE;
1103   if (mFrame != aOther.mFrame || mCols != aOther.mCols)
1104     return NS_STYLE_HINT_REFLOW;
1105   return NS_STYLE_HINT_NONE;
1106 }
1107
1108 #ifdef DEBUG
1109 /* static */
1110 nsChangeHint nsStyleTable::MaxDifference()
1111 {
1112   return NS_STYLE_HINT_FRAMECHANGE;
1113 }
1114 #endif
1115
1116 // -----------------------
1117 // nsStyleTableBorder
1118
1119 nsStyleTableBorder::nsStyleTableBorder(nsPresContext* aPresContext)
1120 {
1121   mBorderCollapse = NS_STYLE_BORDER_SEPARATE;
1122
1123   nsCompatibility compatMode = eCompatibility_FullStandards;
1124   if (aPresContext)
1125     compatMode = aPresContext->CompatibilityMode();
1126   mEmptyCells = (compatMode == eCompatibility_NavQuirks)
1127                   ? NS_STYLE_TABLE_EMPTY_CELLS_SHOW_BACKGROUND
1128                   : NS_STYLE_TABLE_EMPTY_CELLS_SHOW;
1129   mCaptionSide = NS_STYLE_CAPTION_SIDE_TOP;
1130   mBorderSpacingX = 0;
1131   mBorderSpacingY = 0;
1132 }
1133
1134 nsStyleTableBorder::~nsStyleTableBorder(void)
1135 {
1136 }
1137
1138 nsStyleTableBorder::nsStyleTableBorder(const nsStyleTableBorder& aSource)
1139 {
1140   memcpy((nsStyleTableBorder*)this, &aSource, sizeof(nsStyleTableBorder));
1141 }
1142
1143 nsChangeHint nsStyleTableBorder::CalcDifference(const nsStyleTableBorder& aOther) const
1144 {
1145   // Border-collapse changes need a reframe, because we use a different frame
1146   // class for table cells in the collapsed border model.  This is used to
1147   // conserve memory when using the separated border model (collapsed borders
1148   // require extra state to be stored).
1149   if (mBorderCollapse != aOther.mBorderCollapse) {
1150     return NS_STYLE_HINT_FRAMECHANGE;
1151   }
1152
1153   if ((mCaptionSide == aOther.mCaptionSide) &&
1154       (mBorderSpacingX == aOther.mBorderSpacingX) &&
1155       (mBorderSpacingY == aOther.mBorderSpacingY)) {
1156     if (mEmptyCells == aOther.mEmptyCells)
1157       return NS_STYLE_HINT_NONE;
1158     return NS_STYLE_HINT_VISUAL;
1159   }
1160   else
1161     return NS_STYLE_HINT_REFLOW;
1162 }
1163
1164 #ifdef DEBUG
1165 /* static */
1166 nsChangeHint nsStyleTableBorder::MaxDifference()
1167 {
1168   return NS_STYLE_HINT_FRAMECHANGE;
1169 }
1170 #endif
1171
1172 // --------------------
1173 // nsStyleColor
1174 //
1175
1176 nsStyleColor::nsStyleColor(nsPresContext* aPresContext)
1177 {
1178   mColor = aPresContext->DefaultColor();
1179 }
1180
1181 nsStyleColor::nsStyleColor(const nsStyleColor& aSource)
1182 {
1183   mColor = aSource.mColor;
1184 }
1185
1186 nsChangeHint nsStyleColor::CalcDifference(const nsStyleColor& aOther) const
1187 {
1188   if (mColor == aOther.mColor)
1189     return NS_STYLE_HINT_NONE;
1190   return NS_STYLE_HINT_VISUAL;
1191 }
1192
1193 #ifdef DEBUG
1194 /* static */
1195 nsChangeHint nsStyleColor::MaxDifference()
1196 {
1197   return NS_STYLE_HINT_VISUAL;
1198 }
1199 #endif
1200
1201 // --------------------
1202 // nsStyleBackground
1203 //
1204
1205 nsStyleBackground::nsStyleBackground()
1206   : mBackgroundFlags(NS_STYLE_BG_IMAGE_NONE),
1207     mBackgroundAttachment(NS_STYLE_BG_ATTACHMENT_SCROLL),
1208     mBackgroundClip(NS_STYLE_BG_CLIP_BORDER),
1209     mBackgroundInlinePolicy(NS_STYLE_BG_INLINE_POLICY_CONTINUOUS),
1210     mBackgroundOrigin(NS_STYLE_BG_ORIGIN_PADDING),
1211     mBackgroundRepeat(NS_STYLE_BG_REPEAT_XY),
1212     mBackgroundColor(NS_RGBA(0, 0, 0, 0))
1213 {
1214 }
1215
1216 nsStyleBackground::nsStyleBackground(const nsStyleBackground& aSource)
1217   : mBackgroundFlags(aSource.mBackgroundFlags),
1218     mBackgroundAttachment(aSource.mBackgroundAttachment),
1219     mBackgroundClip(aSource.mBackgroundClip),
1220     mBackgroundInlinePolicy(aSource.mBackgroundInlinePolicy),
1221     mBackgroundOrigin(aSource.mBackgroundOrigin),
1222     mBackgroundRepeat(aSource.mBackgroundRepeat),
1223     mBackgroundXPosition(aSource.mBackgroundXPosition),
1224     mBackgroundYPosition(aSource.mBackgroundYPosition),
1225     mBackgroundColor(aSource.mBackgroundColor),
1226     mBackgroundImage(aSource.mBackgroundImage)
1227 {
1228 }
1229
1230 nsStyleBackground::~nsStyleBackground()
1231 {
1232 }
1233
1234 nsChangeHint nsStyleBackground::CalcDifference(const nsStyleBackground& aOther) const
1235 {
1236   if ((mBackgroundAttachment == aOther.mBackgroundAttachment) &&
1237       (mBackgroundFlags == aOther.mBackgroundFlags) &&
1238       (mBackgroundRepeat == aOther.mBackgroundRepeat) &&
1239       (mBackgroundColor == aOther.mBackgroundColor) &&
1240       (mBackgroundClip == aOther.mBackgroundClip) &&
1241       (mBackgroundInlinePolicy == aOther.mBackgroundInlinePolicy) &&
1242       (mBackgroundOrigin == aOther.mBackgroundOrigin) &&
1243       EqualImages(mBackgroundImage, aOther.mBackgroundImage) &&
1244       ((!(mBackgroundFlags & NS_STYLE_BG_X_POSITION_PERCENT) ||
1245        (mBackgroundXPosition.mFloat == aOther.mBackgroundXPosition.mFloat)) &&
1246        (!(mBackgroundFlags & NS_STYLE_BG_X_POSITION_LENGTH) ||
1247         (mBackgroundXPosition.mCoord == aOther.mBackgroundXPosition.mCoord))) &&
1248       ((!(mBackgroundFlags & NS_STYLE_BG_Y_POSITION_PERCENT) ||
1249        (mBackgroundYPosition.mFloat == aOther.mBackgroundYPosition.mFloat)) &&
1250        (!(mBackgroundFlags & NS_STYLE_BG_Y_POSITION_LENGTH) ||
1251         (mBackgroundYPosition.mCoord == aOther.mBackgroundYPosition.mCoord))))
1252     return NS_STYLE_HINT_NONE;
1253   return NS_STYLE_HINT_VISUAL;
1254 }
1255
1256 #ifdef DEBUG
1257 /* static */
1258 nsChangeHint nsStyleBackground::MaxDifference()
1259 {
1260   return NS_STYLE_HINT_VISUAL;
1261 }
1262 #endif
1263
1264 PRBool nsStyleBackground::HasFixedBackground() const
1265 {
1266   return mBackgroundAttachment == NS_STYLE_BG_ATTACHMENT_FIXED &&
1267          mBackgroundImage;
1268 }
1269
1270 // --------------------
1271 // nsStyleDisplay
1272 //
1273
1274 nsStyleDisplay::nsStyleDisplay()
1275 {
1276   mAppearance = NS_THEME_NONE;
1277   mDisplay = NS_STYLE_DISPLAY_INLINE;
1278   mOriginalDisplay = NS_STYLE_DISPLAY_NONE;
1279   mPosition = NS_STYLE_POSITION_STATIC;
1280   mFloats = NS_STYLE_FLOAT_NONE;
1281   mBreakType = NS_STYLE_CLEAR_NONE;
1282   mBreakBefore = PR_FALSE;
1283   mBreakAfter = PR_FALSE;
1284   mOverflowX = NS_STYLE_OVERFLOW_VISIBLE;
1285   mOverflowY = NS_STYLE_OVERFLOW_VISIBLE;
1286   mClipFlags = NS_STYLE_CLIP_AUTO;
1287   mClip.SetRect(0,0,0,0);
1288   mOpacity = 1.0f;
1289   mTransformPresent = PR_FALSE; // No transform
1290   mTransformOrigin[0].SetPercentValue(0.5f); // Transform is centered on origin
1291   mTransformOrigin[1].SetPercentValue(0.5f);
1292 }
1293
1294 nsStyleDisplay::nsStyleDisplay(const nsStyleDisplay& aSource)
1295 {
1296   mAppearance = aSource.mAppearance;
1297   mDisplay = aSource.mDisplay;
1298   mOriginalDisplay = aSource.mOriginalDisplay;
1299   mBinding = aSource.mBinding;
1300   mPosition = aSource.mPosition;
1301   mFloats = aSource.mFloats;
1302   mBreakType = aSource.mBreakType;
1303   mBreakBefore = aSource.mBreakBefore;
1304   mBreakAfter = aSource.mBreakAfter;
1305   mOverflowX = aSource.mOverflowX;
1306   mOverflowY = aSource.mOverflowY;
1307   mClipFlags = aSource.mClipFlags;
1308   mClip = aSource.mClip;
1309   mOpacity = aSource.mOpacity;
1310
1311   /* Copy over the transformation information. */
1312   mTransformPresent = aSource.mTransformPresent;
1313   if (mTransformPresent)
1314     mTransform = aSource.mTransform;
1315
1316   /* Copy over transform origin. */
1317   mTransformOrigin[0] = aSource.mTransformOrigin[0];
1318   mTransformOrigin[1] = aSource.mTransformOrigin[1];
1319 }
1320
1321 nsChangeHint nsStyleDisplay::CalcDifference(const nsStyleDisplay& aOther) const
1322 {
1323   nsChangeHint hint = nsChangeHint(0);
1324
1325   if (!EqualURIs(mBinding, aOther.mBinding)
1326       || mPosition != aOther.mPosition
1327       || mDisplay != aOther.mDisplay
1328       || (mFloats == NS_STYLE_FLOAT_NONE) != (aOther.mFloats == NS_STYLE_FLOAT_NONE)
1329       || mOverflowX != aOther.mOverflowX
1330       || mOverflowY != aOther.mOverflowY)
1331     NS_UpdateHint(hint, nsChangeHint_ReconstructFrame);
1332
1333   if (mFloats != aOther.mFloats)
1334     NS_UpdateHint(hint, nsChangeHint_ReflowFrame);
1335
1336   if (mClipFlags != aOther.mClipFlags || mClip != aOther.mClip) {
1337     NS_UpdateHint(hint, nsChangeHint_ReflowFrame);
1338   }
1339   // XXX the following is conservative, for now: changing float breaking shouldn't
1340   // necessarily require a repaint, reflow should suffice.
1341   if (mBreakType != aOther.mBreakType
1342       || mBreakBefore != aOther.mBreakBefore
1343       || mBreakAfter != aOther.mBreakAfter
1344       || mAppearance != aOther.mAppearance)
1345     NS_UpdateHint(hint, NS_CombineHint(nsChangeHint_ReflowFrame, nsChangeHint_RepaintFrame));
1346
1347   if (mOpacity != aOther.mOpacity)
1348     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
1349
1350   /* If we've added or removed the transform property, we need to reconstruct the frame to add
1351    * or remove the view object, and also to handle abs-pos and fixed-pos containers.
1352    */
1353   if (mTransformPresent != aOther.mTransformPresent) {
1354     NS_UpdateHint(hint, nsChangeHint_ReconstructFrame);
1355   }
1356   else if (mTransformPresent) {
1357     /* Otherwise, if we've kept the property lying around and we already had a
1358      * transform, we need to see whether or not we've changed the transform.
1359      * If so, we need to do a reflow and a repaint. The reflow is to recompute
1360      * the overflow rect (which probably changed if the transform changed)
1361      * and to redraw within the bounds of that new overflow rect.
1362      */
1363     if (mTransform != aOther.mTransform)
1364       NS_UpdateHint(hint, NS_CombineHint(nsChangeHint_ReflowFrame,
1365                                          nsChangeHint_RepaintFrame));
1366
1367     for (PRUint8 index = 0; index < 2; ++index)
1368       if (mTransformOrigin[index] != aOther.mTransformOrigin[index]) {
1369         NS_UpdateHint(hint, NS_CombineHint(nsChangeHint_ReflowFrame,
1370                                            nsChangeHint_RepaintFrame));
1371         break;
1372       }
1373   }
1374
1375
1376   return hint;
1377 }
1378
1379 #ifdef DEBUG
1380 /* static */
1381 nsChangeHint nsStyleDisplay::MaxDifference()
1382 {
1383   // All the parts of FRAMECHANGE are present above in CalcDifference.
1384   return NS_STYLE_HINT_FRAMECHANGE;
1385 }
1386 #endif
1387
1388 // --------------------
1389 // nsStyleVisibility
1390 //
1391
1392 nsStyleVisibility::nsStyleVisibility(nsPresContext* aPresContext)
1393 {
1394   PRUint32 bidiOptions = aPresContext->GetBidi();
1395   if (GET_BIDI_OPTION_DIRECTION(bidiOptions) == IBMBIDI_TEXTDIRECTION_RTL)
1396     mDirection = NS_STYLE_DIRECTION_RTL;
1397   else
1398     mDirection = NS_STYLE_DIRECTION_LTR;
1399
1400   mLangGroup = aPresContext->GetLangGroup();
1401   mVisible = NS_STYLE_VISIBILITY_VISIBLE;
1402 }
1403
1404 nsStyleVisibility::nsStyleVisibility(const nsStyleVisibility& aSource)
1405 {
1406   mDirection = aSource.mDirection;
1407   mVisible = aSource.mVisible;
1408   mLangGroup = aSource.mLangGroup;
1409 }
1410
1411 nsChangeHint nsStyleVisibility::CalcDifference(const nsStyleVisibility& aOther) const
1412 {
1413   if ((mDirection == aOther.mDirection) &&
1414       (mLangGroup == aOther.mLangGroup)) {
1415     if ((mVisible == aOther.mVisible)) {
1416       return NS_STYLE_HINT_NONE;
1417     }
1418     if ((NS_STYLE_VISIBILITY_COLLAPSE == mVisible) ||
1419         (NS_STYLE_VISIBILITY_COLLAPSE == aOther.mVisible)) {
1420       return NS_STYLE_HINT_REFLOW;
1421     }
1422     return NS_STYLE_HINT_VISUAL;
1423   }
1424   return NS_STYLE_HINT_REFLOW;
1425 }
1426
1427 #ifdef DEBUG
1428 /* static */
1429 nsChangeHint nsStyleVisibility::MaxDifference()
1430 {
1431   return NS_STYLE_HINT_REFLOW;
1432 }
1433 #endif
1434
1435 nsStyleContentData::~nsStyleContentData()
1436 {
1437   if (mType == eStyleContentType_Image) {
1438     NS_IF_RELEASE(mContent.mImage);
1439   } else if (mType == eStyleContentType_Counter ||
1440              mType == eStyleContentType_Counters) {
1441     mContent.mCounters->Release();
1442   } else if (mContent.mString) {
1443     NS_Free(mContent.mString);
1444   }
1445 }
1446
1447 nsStyleContentData& nsStyleContentData::operator=(const nsStyleContentData& aOther)
1448 {
1449   if (this == &aOther)
1450     return *this;
1451   this->~nsStyleContentData();
1452   new (this) nsStyleContentData();
1453
1454   mType = aOther.mType;
1455   if (mType == eStyleContentType_Image) {
1456     mContent.mImage = aOther.mContent.mImage;
1457     NS_IF_ADDREF(mContent.mImage);
1458   } else if (mType == eStyleContentType_Counter ||
1459              mType == eStyleContentType_Counters) {
1460     mContent.mCounters = aOther.mContent.mCounters;
1461     mContent.mCounters->AddRef();
1462   } else if (aOther.mContent.mString) {
1463     mContent.mString = NS_strdup(aOther.mContent.mString);
1464   } else {
1465     mContent.mString = nsnull;
1466   }
1467   return *this;
1468 }
1469
1470 PRBool nsStyleContentData::operator==(const nsStyleContentData& aOther) const
1471 {
1472   if (mType != aOther.mType)
1473     return PR_FALSE;
1474   if (mType == eStyleContentType_Image) {
1475     if (!mContent.mImage || !aOther.mContent.mImage)
1476       return mContent.mImage == aOther.mContent.mImage;
1477     PRBool eq;
1478     nsCOMPtr<nsIURI> thisURI, otherURI;
1479     mContent.mImage->GetURI(getter_AddRefs(thisURI));
1480     aOther.mContent.mImage->GetURI(getter_AddRefs(otherURI));
1481     return thisURI == otherURI ||  // handles null==null
1482            (thisURI && otherURI &&
1483             NS_SUCCEEDED(thisURI->Equals(otherURI, &eq)) &&
1484             eq);
1485   }
1486   if (mType == eStyleContentType_Counter ||
1487       mType == eStyleContentType_Counters)
1488     return *mContent.mCounters == *aOther.mContent.mCounters;
1489   return nsCRT::strcmp(mContent.mString, aOther.mContent.mString) == 0;
1490 }
1491
1492 //-----------------------
1493 // nsStyleContent
1494 //
1495
1496 nsStyleContent::nsStyleContent(void)
1497   : mMarkerOffset(),
1498     mContentCount(0),
1499     mContents(nsnull),
1500     mIncrementCount(0),
1501     mIncrements(nsnull),
1502     mResetCount(0),
1503     mResets(nsnull)
1504 {
1505   mMarkerOffset.SetAutoValue();
1506 }
1507
1508 nsStyleContent::~nsStyleContent(void)
1509 {
1510   DELETE_ARRAY_IF(mContents);
1511   DELETE_ARRAY_IF(mIncrements);
1512   DELETE_ARRAY_IF(mResets);
1513 }
1514
1515 nsStyleContent::nsStyleContent(const nsStyleContent& aSource)
1516    :mMarkerOffset(),
1517     mContentCount(0),
1518     mContents(nsnull),
1519     mIncrementCount(0),
1520     mIncrements(nsnull),
1521     mResetCount(0),
1522     mResets(nsnull)
1523
1524 {
1525   mMarkerOffset = aSource.mMarkerOffset;
1526
1527   PRUint32 index;
1528   if (NS_SUCCEEDED(AllocateContents(aSource.ContentCount()))) {
1529     for (index = 0; index < mContentCount; index++) {
1530       ContentAt(index) = aSource.ContentAt(index);
1531     }
1532   }
1533
1534   if (NS_SUCCEEDED(AllocateCounterIncrements(aSource.CounterIncrementCount()))) {
1535     for (index = 0; index < mIncrementCount; index++) {
1536       const nsStyleCounterData *data = aSource.GetCounterIncrementAt(index);
1537       mIncrements[index].mCounter = data->mCounter;
1538       mIncrements[index].mValue = data->mValue;
1539     }
1540   }
1541
1542   if (NS_SUCCEEDED(AllocateCounterResets(aSource.CounterResetCount()))) {
1543     for (index = 0; index < mResetCount; index++) {
1544       const nsStyleCounterData *data = aSource.GetCounterResetAt(index);
1545       mResets[index].mCounter = data->mCounter;
1546       mResets[index].mValue = data->mValue;
1547     }
1548   }
1549 }
1550
1551 nsChangeHint nsStyleContent::CalcDifference(const nsStyleContent& aOther) const
1552 {
1553   if (mContentCount != aOther.mContentCount ||
1554       mIncrementCount != aOther.mIncrementCount ||
1555       mResetCount != aOther.mResetCount) {
1556     return NS_STYLE_HINT_FRAMECHANGE;
1557   }
1558
1559   PRUint32 ix = mContentCount;
1560   while (0 < ix--) {
1561     if (mContents[ix] != aOther.mContents[ix]) {
1562       // Unfortunately we need to reframe here; a simple reflow
1563       // will not pick up different text or different image URLs,
1564       // since we set all that up in the CSSFrameConstructor
1565       return NS_STYLE_HINT_FRAMECHANGE;
1566     }
1567   }
1568   ix = mIncrementCount;
1569   while (0 < ix--) {
1570     if ((mIncrements[ix].mValue != aOther.mIncrements[ix].mValue) ||
1571         (mIncrements[ix].mCounter != aOther.mIncrements[ix].mCounter)) {
1572       return NS_STYLE_HINT_FRAMECHANGE;
1573     }
1574   }
1575   ix = mResetCount;
1576   while (0 < ix--) {
1577     if ((mResets[ix].mValue != aOther.mResets[ix].mValue) ||
1578         (mResets[ix].mCounter != aOther.mResets[ix].mCounter)) {
1579       return NS_STYLE_HINT_FRAMECHANGE;
1580     }
1581   }
1582   if (mMarkerOffset != aOther.mMarkerOffset) {
1583     return NS_STYLE_HINT_REFLOW;
1584   }
1585   return NS_STYLE_HINT_NONE;
1586 }
1587
1588 #ifdef DEBUG
1589 /* static */
1590 nsChangeHint nsStyleContent::MaxDifference()
1591 {
1592   return NS_STYLE_HINT_FRAMECHANGE;
1593 }
1594 #endif
1595
1596 nsresult nsStyleContent::AllocateContents(PRUint32 aCount)
1597 {
1598   // We need to run the destructors of the elements of mContents, so we
1599   // delete and reallocate even if aCount == mContentCount.  (If
1600   // nsStyleContentData had its members private and managed their
1601   // ownership on setting, we wouldn't need this, but that seems
1602   // unnecessary at this point.)
1603   DELETE_ARRAY_IF(mContents);
1604   if (aCount) {
1605     mContents = new nsStyleContentData[aCount];
1606     if (! mContents) {
1607       mContentCount = 0;
1608       return NS_ERROR_OUT_OF_MEMORY;
1609     }
1610   }
1611   mContentCount = aCount;
1612   return NS_OK;
1613 }
1614
1615 // ---------------------
1616 // nsStyleQuotes
1617 //
1618
1619 nsStyleQuotes::nsStyleQuotes(void)
1620   : mQuotesCount(0),
1621     mQuotes(nsnull)
1622 {
1623   SetInitial();
1624 }
1625
1626 nsStyleQuotes::~nsStyleQuotes(void)
1627 {
1628   DELETE_ARRAY_IF(mQuotes);
1629 }
1630
1631 nsStyleQuotes::nsStyleQuotes(const nsStyleQuotes& aSource)
1632   : mQuotesCount(0),
1633     mQuotes(nsnull)
1634 {
1635   CopyFrom(aSource);
1636 }
1637
1638 void
1639 nsStyleQuotes::SetInitial()
1640 {
1641   // The initial value for quotes is the en-US typographic convention:
1642   // outermost are LEFT and RIGHT DOUBLE QUOTATION MARK, alternating
1643   // with LEFT and RIGHT SINGLE QUOTATION MARK.
1644   static const PRUnichar initialQuotes[8] = {
1645     0x201C, 0, 0x201D, 0, 0x2018, 0, 0x2019, 0
1646   };
1647
1648   if (NS_SUCCEEDED(AllocateQuotes(2))) {
1649     SetQuotesAt(0,
1650                 nsDependentString(&initialQuotes[0], 1),
1651                 nsDependentString(&initialQuotes[2], 1));
1652     SetQuotesAt(1,
1653                 nsDependentString(&initialQuotes[4], 1),
1654                 nsDependentString(&initialQuotes[6], 1));
1655   }
1656 }
1657
1658 void
1659 nsStyleQuotes::CopyFrom(const nsStyleQuotes& aSource)
1660 {
1661   if (NS_SUCCEEDED(AllocateQuotes(aSource.QuotesCount()))) {
1662     PRUint32 count = (mQuotesCount * 2);
1663     for (PRUint32 index = 0; index < count; index += 2) {
1664       aSource.GetQuotesAt(index, mQuotes[index], mQuotes[index + 1]);
1665     }
1666   }
1667 }
1668
1669 nsChangeHint nsStyleQuotes::CalcDifference(const nsStyleQuotes& aOther) const
1670 {
1671   // If the quotes implementation is ever going to change we might not need
1672   // a framechange here and a reflow should be sufficient.  See bug 35768.
1673   if (mQuotesCount == aOther.mQuotesCount) {
1674     PRUint32 ix = (mQuotesCount * 2);
1675     while (0 < ix--) {
1676       if (mQuotes[ix] != aOther.mQuotes[ix]) {
1677         return NS_STYLE_HINT_FRAMECHANGE;
1678       }
1679     }
1680
1681     return NS_STYLE_HINT_NONE;
1682   }
1683   return NS_STYLE_HINT_FRAMECHANGE;
1684 }
1685
1686 #ifdef DEBUG
1687 /* static */
1688 nsChangeHint nsStyleQuotes::MaxDifference()
1689 {
1690   return NS_STYLE_HINT_FRAMECHANGE;
1691 }
1692 #endif
1693
1694 // --------------------
1695 // nsStyleTextReset
1696 //
1697
1698 nsStyleTextReset::nsStyleTextReset(void)
1699 {
1700   mVerticalAlign.SetIntValue(NS_STYLE_VERTICAL_ALIGN_BASELINE, eStyleUnit_Enumerated);
1701   mTextDecoration = NS_STYLE_TEXT_DECORATION_NONE;
1702   mUnicodeBidi = NS_STYLE_UNICODE_BIDI_NORMAL;
1703 }
1704
1705 nsStyleTextReset::nsStyleTextReset(const nsStyleTextReset& aSource)
1706 {
1707   memcpy((nsStyleTextReset*)this, &aSource, sizeof(nsStyleTextReset));
1708 }
1709
1710 nsStyleTextReset::~nsStyleTextReset(void) { }
1711
1712 nsChangeHint nsStyleTextReset::CalcDifference(const nsStyleTextReset& aOther) const
1713 {
1714   if (mVerticalAlign == aOther.mVerticalAlign
1715       && mUnicodeBidi == aOther.mUnicodeBidi) {
1716     if (mTextDecoration != aOther.mTextDecoration) {
1717       // Reflow for blink changes, repaint for others
1718       return
1719         (mTextDecoration & NS_STYLE_TEXT_DECORATION_BLINK) ==
1720         (aOther.mTextDecoration & NS_STYLE_TEXT_DECORATION_BLINK) ?
1721           NS_STYLE_HINT_VISUAL : NS_STYLE_HINT_REFLOW;
1722     }
1723
1724     return NS_STYLE_HINT_NONE;
1725   }
1726   return NS_STYLE_HINT_REFLOW;
1727 }
1728
1729 #ifdef DEBUG
1730 /* static */
1731 nsChangeHint nsStyleTextReset::MaxDifference()
1732 {
1733   return NS_STYLE_HINT_REFLOW;
1734 }
1735 #endif
1736
1737 // --------------------
1738 // nsCSSShadowArray
1739 // nsCSSShadowItem
1740 //
1741
1742 nsrefcnt
1743 nsCSSShadowArray::Release()
1744 {
1745   mRefCnt--;
1746   if (mRefCnt == 0) {
1747     delete this;
1748     return 0;
1749   }
1750   return mRefCnt;
1751 }
1752
1753 static nsChangeHint
1754 CalcShadowDifference(nsCSSShadowArray* lhs,
1755                      nsCSSShadowArray* rhs)
1756 {
1757   if (lhs == rhs)
1758     return NS_STYLE_HINT_NONE;
1759
1760   if (!lhs || !rhs || lhs->Length() != rhs->Length())
1761     return NS_STYLE_HINT_REFLOW;
1762
1763   for (PRUint32 i = 0; i < lhs->Length(); ++i) {
1764     if (*lhs->ShadowAt(i) != *rhs->ShadowAt(i))
1765       return NS_STYLE_HINT_REFLOW;
1766   }
1767   return NS_STYLE_HINT_NONE;
1768 }
1769
1770 // --------------------
1771 // nsStyleText
1772 //
1773
1774 nsStyleText::nsStyleText(void)
1775 {
1776   mTextAlign = NS_STYLE_TEXT_ALIGN_DEFAULT;
1777   mTextTransform = NS_STYLE_TEXT_TRANSFORM_NONE;
1778   mWhiteSpace = NS_STYLE_WHITESPACE_NORMAL;
1779   mWordWrap = NS_STYLE_WORDWRAP_NORMAL;
1780
1781   mLetterSpacing.SetNormalValue();
1782   mLineHeight.SetNormalValue();
1783   mTextIndent.SetCoordValue(0);
1784   mWordSpacing.SetNormalValue();
1785
1786   mTextShadow = nsnull;
1787 }
1788
1789 nsStyleText::nsStyleText(const nsStyleText& aSource)
1790   : mTextAlign(aSource.mTextAlign),
1791     mTextTransform(aSource.mTextTransform),
1792     mWhiteSpace(aSource.mWhiteSpace),
1793     mWordWrap(aSource.mWordWrap),
1794     mLetterSpacing(aSource.mLetterSpacing),
1795     mLineHeight(aSource.mLineHeight),
1796     mTextIndent(aSource.mTextIndent),
1797     mWordSpacing(aSource.mWordSpacing),
1798     mTextShadow(aSource.mTextShadow)
1799 { }
1800
1801 nsStyleText::~nsStyleText(void) { }
1802
1803 nsChangeHint nsStyleText::CalcDifference(const nsStyleText& aOther) const
1804 {
1805   if ((mTextAlign != aOther.mTextAlign) ||
1806       (mTextTransform != aOther.mTextTransform) ||
1807       (mWhiteSpace != aOther.mWhiteSpace) ||
1808       (mWordWrap != aOther.mWordWrap) ||
1809       (mLetterSpacing != aOther.mLetterSpacing) ||
1810       (mLineHeight != aOther.mLineHeight) ||
1811       (mTextIndent != aOther.mTextIndent) ||
1812       (mWordSpacing != aOther.mWordSpacing))
1813     return NS_STYLE_HINT_REFLOW;
1814
1815   return CalcShadowDifference(mTextShadow, aOther.mTextShadow);
1816 }
1817
1818 #ifdef DEBUG
1819 /* static */
1820 nsChangeHint nsStyleText::MaxDifference()
1821 {
1822   return NS_STYLE_HINT_REFLOW;
1823 }
1824 #endif
1825
1826 //-----------------------
1827 // nsStyleUserInterface
1828 //
1829
1830 nsCursorImage::nsCursorImage()
1831   : mHaveHotspot(PR_FALSE)
1832   , mHotspotX(0.0f)
1833   , mHotspotY(0.0f)
1834 {
1835 }
1836
1837 nsStyleUserInterface::nsStyleUserInterface(void)
1838 {
1839   mUserInput = NS_STYLE_USER_INPUT_AUTO;
1840   mUserModify = NS_STYLE_USER_MODIFY_READ_ONLY;
1841   mUserFocus = NS_STYLE_USER_FOCUS_NONE;
1842
1843   mCursor = NS_STYLE_CURSOR_AUTO; // fix for bugzilla bug 51113
1844
1845   mCursorArrayLength = 0;
1846   mCursorArray = nsnull;
1847 }
1848
1849 nsStyleUserInterface::nsStyleUserInterface(const nsStyleUserInterface& aSource) :
1850   mUserInput(aSource.mUserInput),
1851   mUserModify(aSource.mUserModify),
1852   mUserFocus(aSource.mUserFocus),
1853   mCursor(aSource.mCursor)
1854 {
1855   CopyCursorArrayFrom(aSource);
1856 }
1857
1858 nsStyleUserInterface::~nsStyleUserInterface(void)
1859 {
1860   delete [] mCursorArray;
1861 }
1862
1863 nsChangeHint nsStyleUserInterface::CalcDifference(const nsStyleUserInterface& aOther) const
1864 {
1865   nsChangeHint hint = nsChangeHint(0);
1866   if (mCursor != aOther.mCursor)
1867     NS_UpdateHint(hint, nsChangeHint_UpdateCursor);
1868
1869   // We could do better. But it wouldn't be worth it, URL-specified cursors are
1870   // rare.
1871   if (mCursorArrayLength > 0 || aOther.mCursorArrayLength > 0)
1872     NS_UpdateHint(hint, nsChangeHint_UpdateCursor);
1873
1874   if (mUserModify != aOther.mUserModify)
1875     NS_UpdateHint(hint, NS_STYLE_HINT_VISUAL);
1876
1877   if ((mUserInput != aOther.mUserInput) &&
1878       ((NS_STYLE_USER_INPUT_NONE == mUserInput) ||
1879        (NS_STYLE_USER_INPUT_NONE == aOther.mUserInput))) {
1880     NS_UpdateHint(hint, NS_STYLE_HINT_FRAMECHANGE);
1881   }
1882
1883   // ignore mUserFocus
1884
1885   return hint;
1886 }
1887
1888 #ifdef DEBUG
1889 /* static */
1890 nsChangeHint nsStyleUserInterface::MaxDifference()
1891 {
1892   return nsChangeHint(nsChangeHint_UpdateCursor | NS_STYLE_HINT_FRAMECHANGE);
1893 }
1894 #endif
1895
1896 void
1897 nsStyleUserInterface::CopyCursorArrayFrom(const nsStyleUserInterface& aSource)
1898 {
1899   mCursorArray = nsnull;
1900   mCursorArrayLength = 0;
1901   if (aSource.mCursorArrayLength) {
1902     mCursorArray = new nsCursorImage[aSource.mCursorArrayLength];
1903     if (mCursorArray) {
1904       mCursorArrayLength = aSource.mCursorArrayLength;
1905       for (PRUint32 i = 0; i < mCursorArrayLength; ++i)
1906         mCursorArray[i] = aSource.mCursorArray[i];
1907     }
1908   }
1909 }
1910
1911 //-----------------------
1912 // nsStyleUIReset
1913 //
1914
1915 nsStyleUIReset::nsStyleUIReset(void)
1916 {
1917   mUserSelect = NS_STYLE_USER_SELECT_AUTO;
1918   mForceBrokenImageIcon = 0;
1919   mIMEMode = NS_STYLE_IME_MODE_AUTO;
1920   mWindowShadow = NS_STYLE_WINDOW_SHADOW_DEFAULT;
1921 }
1922
1923 nsStyleUIReset::nsStyleUIReset(const nsStyleUIReset& aSource)
1924 {
1925   mUserSelect = aSource.mUserSelect;
1926   mForceBrokenImageIcon = aSource.mForceBrokenImageIcon;
1927   mIMEMode = aSource.mIMEMode;
1928   mWindowShadow = aSource.mWindowShadow;
1929 }
1930
1931 nsStyleUIReset::~nsStyleUIReset(void)
1932 {
1933 }
1934
1935 nsChangeHint nsStyleUIReset::CalcDifference(const nsStyleUIReset& aOther) const
1936 {
1937   // ignore mIMEMode
1938   if (mForceBrokenImageIcon != aOther.mForceBrokenImageIcon)
1939     return NS_STYLE_HINT_FRAMECHANGE;
1940   if (mWindowShadow != aOther.mWindowShadow) {
1941     // We really need just an nsChangeHint_SyncFrameView, except
1942     // on an ancestor of the frame, so we get that by doing a
1943     // reflow.
1944     return NS_STYLE_HINT_REFLOW;
1945   }
1946   if (mUserSelect != aOther.mUserSelect)
1947     return NS_STYLE_HINT_VISUAL;
1948   return NS_STYLE_HINT_NONE;
1949 }
1950
1951 #ifdef DEBUG
1952 /* static */
1953 nsChangeHint nsStyleUIReset::MaxDifference()
1954 {
1955   return NS_STYLE_HINT_FRAMECHANGE;
1956 }
1957 #endif
1958