| File: | var/lib/jenkins/workspace/firefox-scan-build/layout/mathml/nsMathMLmoFrame.cpp |
| Warning: | line 275, column 15 Value stored to 'embellishAncestor' during its initialization is never read |
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| 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| 2 | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
| 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| 6 | |
| 7 | #include "nsMathMLmoFrame.h" |
| 8 | |
| 9 | #include "gfxContext.h" |
| 10 | #include "mozilla/PresShell.h" |
| 11 | #include "mozilla/StaticPrefs_mathml.h" |
| 12 | #include "nsCSSValue.h" |
| 13 | #include "nsLayoutUtils.h" |
| 14 | #include "nsPresContext.h" |
| 15 | #include "nsContentUtils.h" |
| 16 | #include "nsFrameSelection.h" |
| 17 | #include "mozilla/dom/MathMLElement.h" |
| 18 | #include <algorithm> |
| 19 | |
| 20 | using namespace mozilla; |
| 21 | |
| 22 | // |
| 23 | // <mo> -- operator, fence, or separator - implementation |
| 24 | // |
| 25 | |
| 26 | nsIFrame* NS_NewMathMLmoFrame(PresShell* aPresShell, ComputedStyle* aStyle) { |
| 27 | return new (aPresShell) nsMathMLmoFrame(aStyle, aPresShell->GetPresContext()); |
| 28 | } |
| 29 | |
| 30 | NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmoFrame)void* nsMathMLmoFrame ::operator new(size_t sz, mozilla::PresShell * aShell) { return aShell->AllocateFrame(nsQueryFrame::nsMathMLmoFrame_id , sz); } |
| 31 | |
| 32 | nsMathMLmoFrame::~nsMathMLmoFrame() = default; |
| 33 | |
| 34 | static const char16_t kApplyFunction = char16_t(0x2061); |
| 35 | static const char16_t kInvisibleTimes = char16_t(0x2062); |
| 36 | static const char16_t kInvisibleSeparator = char16_t(0x2063); |
| 37 | static const char16_t kInvisiblePlus = char16_t(0x2064); |
| 38 | |
| 39 | eMathMLFrameType nsMathMLmoFrame::GetMathMLFrameType() { |
| 40 | return NS_MATHML_OPERATOR_IS_INVISIBLE(mFlags)(NS_MATHML_OPERATOR_INVISIBLE == ((mFlags) & NS_MATHML_OPERATOR_INVISIBLE )) |
| 41 | ? eMathMLFrameType_OperatorInvisible |
| 42 | : eMathMLFrameType_OperatorOrdinary; |
| 43 | } |
| 44 | |
| 45 | // since a mouse click implies selection, we cannot just rely on the |
| 46 | // frame's state bit in our child text frame. So we will first check |
| 47 | // its selected state bit, and use this little helper to double check. |
| 48 | bool nsMathMLmoFrame::IsFrameInSelection(nsIFrame* aFrame) { |
| 49 | NS_ASSERTION(aFrame, "null arg")do { if (!(aFrame)) { NS_DebugBreak(NS_DEBUG_ASSERTION, "null arg" , "aFrame", "/var/lib/jenkins/workspace/firefox-scan-build/layout/mathml/nsMathMLmoFrame.cpp" , 49); MOZ_PretendNoReturn(); } } while (0); |
| 50 | if (!aFrame || !aFrame->IsSelected()) { |
| 51 | return false; |
| 52 | } |
| 53 | |
| 54 | const nsFrameSelection* frameSelection = aFrame->GetConstFrameSelection(); |
| 55 | UniquePtr<SelectionDetails> details = |
| 56 | frameSelection->LookUpSelection(aFrame->GetContent(), 0, 1, true); |
| 57 | |
| 58 | return details != nullptr; |
| 59 | } |
| 60 | |
| 61 | bool nsMathMLmoFrame::UseMathMLChar() { |
| 62 | return (NS_MATHML_OPERATOR_GET_FORM(mFlags)((mFlags) & NS_MATHML_OPERATOR_FORM) && |
| 63 | NS_MATHML_OPERATOR_IS_MUTABLE(mFlags)(NS_MATHML_OPERATOR_MUTABLE == ((mFlags) & NS_MATHML_OPERATOR_MUTABLE ))) || |
| 64 | NS_MATHML_OPERATOR_FORCES_MATHML_CHAR(mFlags)(NS_MATHML_OPERATOR_FORCE_MATHML_CHAR == ((mFlags) & NS_MATHML_OPERATOR_FORCE_MATHML_CHAR )); |
| 65 | } |
| 66 | |
| 67 | void nsMathMLmoFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, |
| 68 | const nsDisplayListSet& aLists) { |
| 69 | bool useMathMLChar = UseMathMLChar(); |
| 70 | |
| 71 | if (!useMathMLChar) { |
| 72 | // let the base class do everything |
| 73 | nsMathMLTokenFrame::BuildDisplayList(aBuilder, aLists); |
| 74 | } else { |
| 75 | DisplayBorderBackgroundOutline(aBuilder, aLists); |
| 76 | |
| 77 | // make our char selected if our inner child text frame is selected |
| 78 | bool isSelected = false; |
| 79 | nsRect selectedRect; |
| 80 | nsIFrame* firstChild = mFrames.FirstChild(); |
| 81 | if (IsFrameInSelection(firstChild)) { |
| 82 | mMathMLChar.GetRect(selectedRect); |
| 83 | // add a one pixel border (it renders better for operators like minus) |
| 84 | selectedRect.Inflate(nsPresContext::CSSPixelsToAppUnits(1)); |
| 85 | isSelected = true; |
| 86 | } |
| 87 | mMathMLChar.Display(aBuilder, this, aLists, 0, |
| 88 | isSelected ? &selectedRect : nullptr); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | // get the text that we enclose and setup our nsMathMLChar |
| 93 | void nsMathMLmoFrame::ProcessTextData() { |
| 94 | mFlags = 0; |
| 95 | |
| 96 | nsAutoString data; |
| 97 | nsContentUtils::GetNodeTextContent(mContent, false, data); |
| 98 | |
| 99 | data.CompressWhitespace(); |
| 100 | int32_t length = data.Length(); |
| 101 | char16_t ch = (length == 0) ? char16_t('\0') : data[0]; |
| 102 | |
| 103 | if ((length == 1) && (ch == kApplyFunction || ch == kInvisibleSeparator || |
| 104 | ch == kInvisiblePlus || ch == kInvisibleTimes)) { |
| 105 | mFlags |= NS_MATHML_OPERATOR_INVISIBLE; |
| 106 | } |
| 107 | |
| 108 | // don't bother doing anything special if we don't have a single child |
| 109 | if (mFrames.GetLength() != 1) { |
| 110 | data.Truncate(); // empty data to reset the char |
| 111 | mMathMLChar.SetData(data); |
| 112 | mMathMLChar.SetComputedStyle(Style()); |
| 113 | return; |
| 114 | } |
| 115 | |
| 116 | // special... in math mode, the usual minus sign '-' looks too short, so |
| 117 | // what we do here is to remap <mo>-</mo> to the official Unicode minus |
| 118 | // sign (U+2212) which looks much better. For background on this, see |
| 119 | // http://groups.google.com/groups?hl=en&th=66488daf1ade7635&rnum=1 |
| 120 | if (1 == length && ch == '-') { |
| 121 | ch = 0x2212; |
| 122 | data = ch; |
| 123 | mFlags |= NS_MATHML_OPERATOR_FORCE_MATHML_CHAR; |
| 124 | } |
| 125 | |
| 126 | // cache the special bits: mutable, accent, movablelimits, centered. |
| 127 | // we need to do this in anticipation of other requirements, and these |
| 128 | // bits don't change. Do not reset these bits unless the text gets changed. |
| 129 | |
| 130 | // lookup all the forms under which the operator is listed in the dictionary, |
| 131 | // and record whether the operator has accent="true" or movablelimits="true" |
| 132 | nsOperatorFlags allFlags = 0; |
| 133 | for (const auto& form : |
| 134 | {NS_MATHML_OPERATOR_FORM_INFIX, NS_MATHML_OPERATOR_FORM_POSTFIX, |
| 135 | NS_MATHML_OPERATOR_FORM_PREFIX}) { |
| 136 | nsOperatorFlags flags = 0; |
| 137 | float dummy; |
| 138 | if (nsMathMLOperators::LookupOperator(data, form, &flags, &dummy, &dummy)) { |
| 139 | allFlags |= flags; |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | mFlags |= allFlags & NS_MATHML_OPERATOR_ACCENT; |
| 144 | mFlags |= allFlags & NS_MATHML_OPERATOR_MOVABLELIMITS; |
| 145 | |
| 146 | if (!StaticPrefs::mathml_centered_operators_disabled()) { |
| 147 | // see if this is an operator that should be centered to cater for |
| 148 | // fonts that are not math-aware |
| 149 | if (1 == length) { |
| 150 | if ((ch == '+') || (ch == '=') || (ch == '*') || |
| 151 | (ch == 0x2212) || // − |
| 152 | (ch == 0x2264) || // ≤ |
| 153 | (ch == 0x2265) || // ≥ |
| 154 | (ch == 0x00D7)) { // × |
| 155 | mFlags |= NS_MATHML_OPERATOR_CENTERED; |
| 156 | mFlags |= NS_MATHML_OPERATOR_FORCE_MATHML_CHAR; |
| 157 | } |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | // cache the operator |
| 162 | mMathMLChar.SetData(data); |
| 163 | |
| 164 | // cache the native direction -- beware of bug 133429... |
| 165 | // mEmbellishData.direction must always retain our native direction, whereas |
| 166 | // mMathMLChar.GetStretchDirection() may change later, when Stretch() is |
| 167 | // called |
| 168 | mEmbellishData.direction = mMathMLChar.GetStretchDirection(); |
| 169 | |
| 170 | bool isMutable = |
| 171 | NS_MATHML_OPERATOR_IS_LARGEOP(allFlags)(NS_MATHML_OPERATOR_LARGEOP == ((allFlags) & NS_MATHML_OPERATOR_LARGEOP )) || |
| 172 | (mEmbellishData.direction != NS_STRETCH_DIRECTION_UNSUPPORTED); |
| 173 | if (isMutable) { |
| 174 | mFlags |= NS_MATHML_OPERATOR_MUTABLE; |
| 175 | } |
| 176 | |
| 177 | mMathMLChar.SetComputedStyle(Style()); |
| 178 | } |
| 179 | |
| 180 | // get our 'form' and lookup in the Operator Dictionary to fetch |
| 181 | // our default data that may come from there. Then complete our setup |
| 182 | // using attributes that we may have. To stay in sync, this function is |
| 183 | // called very often. We depend on many things that may change around us. |
| 184 | // However, we re-use unchanged values. |
| 185 | void nsMathMLmoFrame::ProcessOperatorData() { |
| 186 | // if we have been here before, we will just use our cached form |
| 187 | uint8_t form = NS_MATHML_OPERATOR_GET_FORM(mFlags)((mFlags) & NS_MATHML_OPERATOR_FORM); |
| 188 | nsAutoString value; |
| 189 | float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this); |
| 190 | |
| 191 | // special bits are always kept in mFlags. |
| 192 | // remember the mutable bit from ProcessTextData(). |
| 193 | // Some chars are listed under different forms in the dictionary, |
| 194 | // and there could be a form under which the char is mutable. |
| 195 | // If the char is the core of an embellished container, we will keep |
| 196 | // it mutable irrespective of the form of the embellished container. |
| 197 | // Also remember the other special bits that we want to carry forward. |
| 198 | mFlags &= NS_MATHML_OPERATOR_MUTABLE | NS_MATHML_OPERATOR_ACCENT | |
| 199 | NS_MATHML_OPERATOR_MOVABLELIMITS | NS_MATHML_OPERATOR_CENTERED | |
| 200 | NS_MATHML_OPERATOR_INVISIBLE | NS_MATHML_OPERATOR_FORCE_MATHML_CHAR; |
| 201 | |
| 202 | if (!mEmbellishData.coreFrame) { |
| 203 | // i.e., we haven't been here before, the default form is infix |
| 204 | form = NS_MATHML_OPERATOR_FORM_INFIX; |
| 205 | |
| 206 | // reset everything so that we don't keep outdated values around |
| 207 | // in case of dynamic changes |
| 208 | mEmbellishData.flags = 0; |
| 209 | mEmbellishData.coreFrame = nullptr; |
| 210 | mEmbellishData.leadingSpace = 0; |
| 211 | mEmbellishData.trailingSpace = 0; |
| 212 | if (mMathMLChar.Length() != 1) { |
| 213 | mEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED; |
| 214 | } |
| 215 | // else... retain the native direction obtained in ProcessTextData() |
| 216 | |
| 217 | if (!mFrames.FirstChild()) { |
| 218 | return; |
| 219 | } |
| 220 | |
| 221 | mEmbellishData.flags |= NS_MATHML_EMBELLISH_OPERATOR0x00000001; |
| 222 | mEmbellishData.coreFrame = this; |
| 223 | |
| 224 | // there are two particular things that we also need to record so that if |
| 225 | // our parent is <mover>, <munder>, or <munderover>, they will treat us |
| 226 | // properly: 1) do we have accent="true" 2) do we have movablelimits="true" |
| 227 | |
| 228 | // they need the extra information to decide how to treat their |
| 229 | // scripts/limits (note: <mover>, <munder>, or <munderover> need not |
| 230 | // necessarily be our direct parent -- case of embellished operators) |
| 231 | |
| 232 | // default values from the Operator Dictionary were obtained in |
| 233 | // ProcessTextData() and these special bits are always kept in mFlags |
| 234 | if (NS_MATHML_OPERATOR_IS_ACCENT(mFlags)(NS_MATHML_OPERATOR_ACCENT == ((mFlags) & NS_MATHML_OPERATOR_ACCENT ))) { |
| 235 | mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENT0x00000004; |
| 236 | } |
| 237 | if (NS_MATHML_OPERATOR_IS_MOVABLELIMITS(mFlags)(NS_MATHML_OPERATOR_MOVABLELIMITS == ((mFlags) & NS_MATHML_OPERATOR_MOVABLELIMITS ))) { |
| 238 | mEmbellishData.flags |= NS_MATHML_EMBELLISH_MOVABLELIMITS0x00000002; |
| 239 | } |
| 240 | |
| 241 | // see if the accent attribute is there |
| 242 | mContent->AsElement()->GetAttr(nsGkAtoms::accent_, value); |
| 243 | if (value.LowerCaseEqualsLiteral("true")) { |
| 244 | mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENT0x00000004; |
| 245 | } else if (value.LowerCaseEqualsLiteral("false")) { |
| 246 | mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENT0x00000004; |
| 247 | } |
| 248 | |
| 249 | // see if the movablelimits attribute is there |
| 250 | mContent->AsElement()->GetAttr(nsGkAtoms::movablelimits_, value); |
| 251 | if (value.LowerCaseEqualsLiteral("true")) { |
| 252 | mEmbellishData.flags |= NS_MATHML_EMBELLISH_MOVABLELIMITS0x00000002; |
| 253 | } else if (value.LowerCaseEqualsLiteral("false")) { |
| 254 | mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_MOVABLELIMITS0x00000002; |
| 255 | } |
| 256 | |
| 257 | // --------------------------------------------------------------------- |
| 258 | // we will be called again to re-sync the rest of our state next time... |
| 259 | // (nobody needs the other values below at this stage) |
| 260 | mFlags |= form; |
| 261 | return; |
| 262 | } |
| 263 | |
| 264 | nsPresContext* presContext = PresContext(); |
| 265 | |
| 266 | // beware of bug 133814 - there is a two-way dependency in the |
| 267 | // embellished hierarchy: our embellished ancestors need to set |
| 268 | // their flags based on some of our state (set above), and here we |
| 269 | // need to re-sync our 'form' depending on our outermost embellished |
| 270 | // container. A null form here means that an earlier attempt to stretch |
| 271 | // our mMathMLChar failed, in which case we don't bother re-stretching again |
| 272 | if (form) { |
| 273 | // get our outermost embellished container and its parent. |
| 274 | // (we ensure that we are the core, not just a sibling of the core) |
| 275 | nsIFrame* embellishAncestor = this; |
Value stored to 'embellishAncestor' during its initialization is never read | |
| 276 | nsEmbellishData embellishData; |
| 277 | nsIFrame* parentAncestor = this; |
| 278 | do { |
| 279 | embellishAncestor = parentAncestor; |
| 280 | parentAncestor = embellishAncestor->GetParent(); |
| 281 | GetEmbellishDataFrom(parentAncestor, embellishData); |
| 282 | } while (embellishData.coreFrame == this); |
| 283 | |
| 284 | // flag if we have an embellished ancestor |
| 285 | if (embellishAncestor != this) { |
| 286 | mFlags |= NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR; |
| 287 | } else { |
| 288 | mFlags &= ~NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR; |
| 289 | } |
| 290 | |
| 291 | // find the position of our outermost embellished container w.r.t |
| 292 | // its siblings. |
| 293 | |
| 294 | nsIFrame* nextSibling = embellishAncestor->GetNextSibling(); |
| 295 | nsIFrame* prevSibling = embellishAncestor->GetPrevSibling(); |
| 296 | |
| 297 | // flag to distinguish from a real infix. Set for (embellished) operators |
| 298 | // that live in (inferred) mrows. |
| 299 | nsIMathMLFrame* mathAncestor = do_QueryFrame(parentAncestor); |
| 300 | bool zeroSpacing = false; |
| 301 | if (mathAncestor) { |
| 302 | zeroSpacing = !mathAncestor->IsMrowLike(); |
| 303 | } else { |
| 304 | nsMathMLmathBlockFrame* blockFrame = do_QueryFrame(parentAncestor); |
| 305 | if (blockFrame) { |
| 306 | zeroSpacing = !blockFrame->IsMrowLike(); |
| 307 | } |
| 308 | } |
| 309 | if (zeroSpacing) { |
| 310 | mFlags |= NS_MATHML_OPERATOR_EMBELLISH_ISOLATED; |
| 311 | } else { |
| 312 | mFlags &= ~NS_MATHML_OPERATOR_EMBELLISH_ISOLATED; |
| 313 | } |
| 314 | |
| 315 | // find our form |
| 316 | form = NS_MATHML_OPERATOR_FORM_INFIX; |
| 317 | mContent->AsElement()->GetAttr(nsGkAtoms::form, value); |
| 318 | if (!value.IsEmpty()) { |
| 319 | if (value.EqualsLiteral("prefix")) { |
| 320 | form = NS_MATHML_OPERATOR_FORM_PREFIX; |
| 321 | } else if (value.EqualsLiteral("postfix")) { |
| 322 | form = NS_MATHML_OPERATOR_FORM_POSTFIX; |
| 323 | } |
| 324 | } else { |
| 325 | // set our form flag depending on the position |
| 326 | if (!prevSibling && nextSibling) { |
| 327 | form = NS_MATHML_OPERATOR_FORM_PREFIX; |
| 328 | } else if (prevSibling && !nextSibling) { |
| 329 | form = NS_MATHML_OPERATOR_FORM_POSTFIX; |
| 330 | } |
| 331 | } |
| 332 | mFlags &= ~NS_MATHML_OPERATOR_FORM; // clear the old form bits |
| 333 | mFlags |= form; |
| 334 | |
| 335 | // Use the default value suggested by the MathML REC. |
| 336 | // http://www.w3.org/TR/MathML/chapter3.html#presm.mo.attrs |
| 337 | // thickmathspace = 5/18em |
| 338 | float lspace = 5.0f / 18.0f; |
| 339 | float rspace = 5.0f / 18.0f; |
| 340 | // lookup the operator dictionary |
| 341 | nsAutoString data; |
| 342 | mMathMLChar.GetData(data); |
| 343 | nsOperatorFlags flags = 0; |
| 344 | if (nsMathMLOperators::LookupOperatorWithFallback(data, form, &flags, |
| 345 | &lspace, &rspace)) { |
| 346 | mFlags &= ~NS_MATHML_OPERATOR_FORM; // clear the form bits |
| 347 | mFlags |= flags; // just add bits without overwriting |
| 348 | } |
| 349 | |
| 350 | // Spacing is zero if our outermost embellished operator is not in an |
| 351 | // inferred mrow. |
| 352 | if (!NS_MATHML_OPERATOR_EMBELLISH_IS_ISOLATED(mFlags)(NS_MATHML_OPERATOR_EMBELLISH_ISOLATED == ((mFlags) & NS_MATHML_OPERATOR_EMBELLISH_ISOLATED )) && |
| 353 | (lspace || rspace)) { |
| 354 | // Cache the default values of lspace and rspace. |
| 355 | // since these values are relative to the 'em' unit, convert to twips now |
| 356 | nscoord em; |
| 357 | RefPtr<nsFontMetrics> fm = |
| 358 | nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation); |
| 359 | GetEmHeight(fm, em); |
| 360 | |
| 361 | mEmbellishData.leadingSpace = NSToCoordRound(lspace * em); |
| 362 | mEmbellishData.trailingSpace = NSToCoordRound(rspace * em); |
| 363 | |
| 364 | // tuning if we don't want too much extra space when we are a script. |
| 365 | // (with its fonts, TeX sets lspace=0 & rspace=0 as soon as scriptlevel>0. |
| 366 | // Our fonts can be anything, so...) |
| 367 | if (StyleFont()->mMathDepth > 0 && |
| 368 | !NS_MATHML_OPERATOR_HAS_EMBELLISH_ANCESTOR(mFlags)(NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR == ((mFlags) & NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR ))) { |
| 369 | mEmbellishData.leadingSpace /= 2; |
| 370 | mEmbellishData.trailingSpace /= 2; |
| 371 | } |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | // If we are an accent without explicit lspace="." or rspace=".", |
| 376 | // we will ignore our default leading/trailing space |
| 377 | |
| 378 | // lspace |
| 379 | // |
| 380 | // "Specifies the leading space appearing before the operator" |
| 381 | // |
| 382 | // values: length |
| 383 | // default: set by dictionary (thickmathspace) |
| 384 | // |
| 385 | // XXXfredw Support for negative and relative values is not implemented |
| 386 | // (bug 805926). |
| 387 | // Relative values will give a multiple of the current leading space, |
| 388 | // which is not necessarily the default one. |
| 389 | // |
| 390 | nscoord leadingSpace = mEmbellishData.leadingSpace; |
| 391 | mContent->AsElement()->GetAttr(nsGkAtoms::lspace_, value); |
| 392 | if (!value.IsEmpty()) { |
| 393 | nsCSSValue cssValue; |
| 394 | if (dom::MathMLElement::ParseNumericValue(value, cssValue, 0, |
| 395 | mContent->OwnerDoc())) { |
| 396 | if ((eCSSUnit_Number == cssValue.GetUnit()) && |
| 397 | !cssValue.GetFloatValue()) { |
| 398 | leadingSpace = 0; |
| 399 | } else if (cssValue.IsLengthUnit()) { |
| 400 | leadingSpace = CalcLength(presContext, mComputedStyle, cssValue, |
| 401 | fontSizeInflation); |
| 402 | } |
| 403 | mFlags |= NS_MATHML_OPERATOR_LSPACE_ATTR; |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | // rspace |
| 408 | // |
| 409 | // "Specifies the trailing space appearing after the operator" |
| 410 | // |
| 411 | // values: length |
| 412 | // default: set by dictionary (thickmathspace) |
| 413 | // |
| 414 | // XXXfredw Support for negative and relative values is not implemented |
| 415 | // (bug 805926). |
| 416 | // Relative values will give a multiple of the current leading space, |
| 417 | // which is not necessarily the default one. |
| 418 | // |
| 419 | nscoord trailingSpace = mEmbellishData.trailingSpace; |
| 420 | mContent->AsElement()->GetAttr(nsGkAtoms::rspace_, value); |
| 421 | if (!value.IsEmpty()) { |
| 422 | nsCSSValue cssValue; |
| 423 | if (dom::MathMLElement::ParseNumericValue(value, cssValue, 0, |
| 424 | mContent->OwnerDoc())) { |
| 425 | if ((eCSSUnit_Number == cssValue.GetUnit()) && |
| 426 | !cssValue.GetFloatValue()) { |
| 427 | trailingSpace = 0; |
| 428 | } else if (cssValue.IsLengthUnit()) { |
| 429 | trailingSpace = CalcLength(presContext, mComputedStyle, cssValue, |
| 430 | fontSizeInflation); |
| 431 | } |
| 432 | mFlags |= NS_MATHML_OPERATOR_RSPACE_ATTR; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | // little extra tuning to round lspace & rspace to at least a pixel so that |
| 437 | // operators don't look as if they are colliding with their operands |
| 438 | if (leadingSpace || trailingSpace) { |
| 439 | nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1); |
| 440 | if (leadingSpace && leadingSpace < onePixel) { |
| 441 | leadingSpace = onePixel; |
| 442 | } |
| 443 | if (trailingSpace && trailingSpace < onePixel) { |
| 444 | trailingSpace = onePixel; |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | // the values that we get from our attributes override the dictionary |
| 449 | mEmbellishData.leadingSpace = leadingSpace; |
| 450 | mEmbellishData.trailingSpace = trailingSpace; |
| 451 | |
| 452 | // Now see if there are user-defined attributes that override the dictionary. |
| 453 | // XXX Bug 1197771 - forcing an attribute to true when it is false in the |
| 454 | // dictionary can cause conflicts in the rest of the stretching algorithms |
| 455 | // (e.g. all largeops are assumed to have a vertical direction) |
| 456 | |
| 457 | // For each attribute overriden by the user, turn off its bit flag. |
| 458 | // symmetric|movablelimits|separator|largeop|accent|fence|stretchy|form |
| 459 | // special: accent and movablelimits are handled above, |
| 460 | // don't process them here |
| 461 | |
| 462 | mContent->AsElement()->GetAttr(nsGkAtoms::stretchy_, value); |
| 463 | if (value.LowerCaseEqualsLiteral("false")) { |
| 464 | mFlags &= ~NS_MATHML_OPERATOR_STRETCHY; |
| 465 | } else if (value.LowerCaseEqualsLiteral("true")) { |
| 466 | mFlags |= NS_MATHML_OPERATOR_STRETCHY; |
| 467 | } |
| 468 | if (NS_MATHML_OPERATOR_IS_FENCE(mFlags)(NS_MATHML_OPERATOR_FENCE == ((mFlags) & NS_MATHML_OPERATOR_FENCE ))) { |
| 469 | mContent->AsElement()->GetAttr(nsGkAtoms::fence_, value); |
| 470 | if (value.LowerCaseEqualsLiteral("false")) { |
| 471 | mFlags &= ~NS_MATHML_OPERATOR_FENCE; |
| 472 | } else { |
| 473 | mEmbellishData.flags |= NS_MATHML_EMBELLISH_FENCE0x00000020; |
| 474 | } |
| 475 | } |
| 476 | mContent->AsElement()->GetAttr(nsGkAtoms::largeop_, value); |
| 477 | if (value.LowerCaseEqualsLiteral("false")) { |
| 478 | mFlags &= ~NS_MATHML_OPERATOR_LARGEOP; |
| 479 | } else if (value.LowerCaseEqualsLiteral("true")) { |
| 480 | mFlags |= NS_MATHML_OPERATOR_LARGEOP; |
| 481 | } |
| 482 | if (NS_MATHML_OPERATOR_IS_SEPARATOR(mFlags)(NS_MATHML_OPERATOR_SEPARATOR == ((mFlags) & NS_MATHML_OPERATOR_SEPARATOR ))) { |
| 483 | mContent->AsElement()->GetAttr(nsGkAtoms::separator_, value); |
| 484 | if (value.LowerCaseEqualsLiteral("false")) { |
| 485 | mFlags &= ~NS_MATHML_OPERATOR_SEPARATOR; |
| 486 | } else { |
| 487 | mEmbellishData.flags |= NS_MATHML_EMBELLISH_SEPARATOR0x00000040; |
| 488 | } |
| 489 | } |
| 490 | mContent->AsElement()->GetAttr(nsGkAtoms::symmetric_, value); |
| 491 | if (value.LowerCaseEqualsLiteral("false")) { |
| 492 | mFlags &= ~NS_MATHML_OPERATOR_SYMMETRIC; |
| 493 | } else if (value.LowerCaseEqualsLiteral("true")) { |
| 494 | mFlags |= NS_MATHML_OPERATOR_SYMMETRIC; |
| 495 | } |
| 496 | |
| 497 | // minsize |
| 498 | // |
| 499 | // "Specifies the minimum size of the operator when stretchy" |
| 500 | // |
| 501 | // values: length |
| 502 | // default: set by dictionary (1em) |
| 503 | // |
| 504 | // We don't allow negative values. |
| 505 | // Note: Contrary to other "length" values, unitless and percentage do not |
| 506 | // give a multiple of the defaut value but a multiple of the operator at |
| 507 | // normal size. |
| 508 | // |
| 509 | mMinSize = 0; |
| 510 | mContent->AsElement()->GetAttr(nsGkAtoms::minsize_, value); |
| 511 | if (!value.IsEmpty()) { |
| 512 | nsCSSValue cssValue; |
| 513 | if (dom::MathMLElement::ParseNumericValue(value, cssValue, 0, |
| 514 | mContent->OwnerDoc())) { |
| 515 | nsCSSUnit unit = cssValue.GetUnit(); |
| 516 | if (eCSSUnit_Number == unit) { |
| 517 | mMinSize = cssValue.GetFloatValue(); |
| 518 | } else if (eCSSUnit_Percent == unit) { |
| 519 | mMinSize = cssValue.GetPercentValue(); |
| 520 | } else if (eCSSUnit_Null != unit) { |
| 521 | mMinSize = float(CalcLength(presContext, mComputedStyle, cssValue, |
| 522 | fontSizeInflation)); |
| 523 | mFlags |= NS_MATHML_OPERATOR_MINSIZE_ABSOLUTE; |
| 524 | } |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | // maxsize |
| 529 | // |
| 530 | // "Specifies the maximum size of the operator when stretchy" |
| 531 | // |
| 532 | // values: length | "infinity" |
| 533 | // default: set by dictionary (infinity) |
| 534 | // |
| 535 | // We don't allow negative values. |
| 536 | // Note: Contrary to other "length" values, unitless and percentage do not |
| 537 | // give a multiple of the defaut value but a multiple of the operator at |
| 538 | // normal size. |
| 539 | // |
| 540 | mMaxSize = NS_MATHML_OPERATOR_SIZE_INFINITY(mozilla::PositiveInfinity<float>()); |
| 541 | mContent->AsElement()->GetAttr(nsGkAtoms::maxsize_, value); |
| 542 | if (!value.IsEmpty()) { |
| 543 | nsCSSValue cssValue; |
| 544 | if (dom::MathMLElement::ParseNumericValue(value, cssValue, 0, |
| 545 | mContent->OwnerDoc())) { |
| 546 | nsCSSUnit unit = cssValue.GetUnit(); |
| 547 | if (eCSSUnit_Number == unit) { |
| 548 | mMaxSize = cssValue.GetFloatValue(); |
| 549 | } else if (eCSSUnit_Percent == unit) { |
| 550 | mMaxSize = cssValue.GetPercentValue(); |
| 551 | } else if (eCSSUnit_Null != unit) { |
| 552 | mMaxSize = float(CalcLength(presContext, mComputedStyle, cssValue, |
| 553 | fontSizeInflation)); |
| 554 | mFlags |= NS_MATHML_OPERATOR_MAXSIZE_ABSOLUTE; |
| 555 | } |
| 556 | } |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | static uint32_t GetStretchHint(nsOperatorFlags aFlags, |
| 561 | nsPresentationData aPresentationData, |
| 562 | bool aIsVertical, |
| 563 | const nsStyleFont* aStyleFont) { |
| 564 | uint32_t stretchHint = NS_STRETCH_NONE; |
| 565 | // See if it is okay to stretch, |
| 566 | // starting from what the Operator Dictionary said |
| 567 | if (NS_MATHML_OPERATOR_IS_MUTABLE(aFlags)(NS_MATHML_OPERATOR_MUTABLE == ((aFlags) & NS_MATHML_OPERATOR_MUTABLE ))) { |
| 568 | // set the largeop or largeopOnly flags to suitably cover all the |
| 569 | // 8 possible cases depending on whether displaystyle, largeop, |
| 570 | // stretchy are true or false (see bug 69325). |
| 571 | // . largeopOnly is taken if largeop=true and stretchy=false |
| 572 | // . largeop is taken if largeop=true and stretchy=true |
| 573 | if (aStyleFont->mMathStyle == StyleMathStyle::Normal && |
| 574 | NS_MATHML_OPERATOR_IS_LARGEOP(aFlags)(NS_MATHML_OPERATOR_LARGEOP == ((aFlags) & NS_MATHML_OPERATOR_LARGEOP ))) { |
| 575 | stretchHint = NS_STRETCH_LARGEOP; // (largeopOnly, not mask!) |
| 576 | if (NS_MATHML_OPERATOR_IS_STRETCHY(aFlags)(NS_MATHML_OPERATOR_STRETCHY == ((aFlags) & NS_MATHML_OPERATOR_STRETCHY ))) { |
| 577 | stretchHint |= NS_STRETCH_NEARER | NS_STRETCH_LARGER; |
| 578 | } |
| 579 | } else if (NS_MATHML_OPERATOR_IS_STRETCHY(aFlags)(NS_MATHML_OPERATOR_STRETCHY == ((aFlags) & NS_MATHML_OPERATOR_STRETCHY ))) { |
| 580 | if (aIsVertical) { |
| 581 | // TeX hint. Can impact some sloppy markups missing <mrow></mrow> |
| 582 | stretchHint = NS_STRETCH_NEARER; |
| 583 | } else { |
| 584 | stretchHint = NS_STRETCH_NORMAL; |
| 585 | } |
| 586 | } |
| 587 | // else if the stretchy and largeop attributes have been disabled, |
| 588 | // the operator is not mutable |
| 589 | } |
| 590 | return stretchHint; |
| 591 | } |
| 592 | |
| 593 | // NOTE: aDesiredStretchSize is an IN/OUT parameter |
| 594 | // On input - it contains our current size |
| 595 | // On output - the same size or the new size that we want |
| 596 | NS_IMETHODIMPnsresult |
| 597 | nsMathMLmoFrame::Stretch(DrawTarget* aDrawTarget, |
| 598 | nsStretchDirection aStretchDirection, |
| 599 | nsBoundingMetrics& aContainerSize, |
| 600 | ReflowOutput& aDesiredStretchSize) { |
| 601 | if (NS_MATHML_STRETCH_WAS_DONE(mPresentationData.flags)(0x20000000U == ((mPresentationData.flags) & 0x20000000U) )) { |
| 602 | NS_WARNING("it is wrong to fire stretch more than once on a frame")NS_DebugBreak(NS_DEBUG_WARNING, "it is wrong to fire stretch more than once on a frame" , nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/layout/mathml/nsMathMLmoFrame.cpp" , 602); |
| 603 | return NS_OK; |
| 604 | } |
| 605 | mPresentationData.flags |= NS_MATHML_STRETCH_DONE0x20000000U; |
| 606 | |
| 607 | nsIFrame* firstChild = mFrames.FirstChild(); |
| 608 | |
| 609 | // get the axis height; |
| 610 | float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this); |
| 611 | RefPtr<nsFontMetrics> fm = |
| 612 | nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation); |
| 613 | nscoord axisHeight, height; |
| 614 | GetAxisHeight(aDrawTarget, fm, axisHeight); |
| 615 | |
| 616 | // get the leading to be left at the top and the bottom of the stretched char |
| 617 | // this seems more reliable than using fm->GetLeading() on suspicious fonts |
| 618 | const nscoord leading = [&fm] { |
| 619 | if (StaticPrefs:: |
| 620 | mathml_top_bottom_spacing_for_stretchy_operators_disabled()) { |
| 621 | return 0; |
| 622 | } |
| 623 | nscoord em; |
| 624 | GetEmHeight(fm, em); |
| 625 | return NSToCoordRound(0.2f * (float)em); |
| 626 | }(); |
| 627 | |
| 628 | // Operators that are stretchy, or those that are to be centered |
| 629 | // to cater for fonts that are not math-aware, are handled by the MathMLChar |
| 630 | // ('form' is reset if stretch fails -- i.e., we don't bother to stretch next |
| 631 | // time) |
| 632 | bool useMathMLChar = UseMathMLChar(); |
| 633 | |
| 634 | nsBoundingMetrics charSize; |
| 635 | nsBoundingMetrics container = aDesiredStretchSize.mBoundingMetrics; |
| 636 | bool isVertical = false; |
| 637 | |
| 638 | if (((aStretchDirection == NS_STRETCH_DIRECTION_VERTICAL) || |
| 639 | (aStretchDirection == NS_STRETCH_DIRECTION_DEFAULT)) && |
| 640 | (mEmbellishData.direction == NS_STRETCH_DIRECTION_VERTICAL)) { |
| 641 | isVertical = true; |
| 642 | } |
| 643 | |
| 644 | uint32_t stretchHint = |
| 645 | GetStretchHint(mFlags, mPresentationData, isVertical, StyleFont()); |
| 646 | |
| 647 | if (useMathMLChar) { |
| 648 | nsBoundingMetrics initialSize = aDesiredStretchSize.mBoundingMetrics; |
| 649 | |
| 650 | if (stretchHint != NS_STRETCH_NONE) { |
| 651 | container = aContainerSize; |
| 652 | |
| 653 | // some adjustments if the operator is symmetric and vertical |
| 654 | |
| 655 | if (isVertical && NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags)(NS_MATHML_OPERATOR_SYMMETRIC == ((mFlags) & NS_MATHML_OPERATOR_SYMMETRIC ))) { |
| 656 | // we need to center about the axis |
| 657 | nscoord delta = std::max(container.ascent - axisHeight, |
| 658 | container.descent + axisHeight); |
| 659 | container.ascent = delta + axisHeight; |
| 660 | container.descent = delta - axisHeight; |
| 661 | |
| 662 | // get ready in case we encounter user-desired min-max size |
| 663 | delta = std::max(initialSize.ascent - axisHeight, |
| 664 | initialSize.descent + axisHeight); |
| 665 | initialSize.ascent = delta + axisHeight; |
| 666 | initialSize.descent = delta - axisHeight; |
| 667 | } |
| 668 | |
| 669 | // check for user-desired min-max size |
| 670 | |
| 671 | if (mMaxSize != NS_MATHML_OPERATOR_SIZE_INFINITY(mozilla::PositiveInfinity<float>()) && mMaxSize > 0.0f) { |
| 672 | // if we are here, there is a user defined maxsize ... |
| 673 | // XXX Set stretchHint = NS_STRETCH_NORMAL? to honor the maxsize as |
| 674 | // close as possible? |
| 675 | if (NS_MATHML_OPERATOR_MAXSIZE_IS_ABSOLUTE(mFlags)(NS_MATHML_OPERATOR_MAXSIZE_ABSOLUTE == ((mFlags) & NS_MATHML_OPERATOR_MAXSIZE_ABSOLUTE ))) { |
| 676 | // there is an explicit value like maxsize="20pt" |
| 677 | // try to maintain the aspect ratio of the char |
| 678 | float aspect = |
| 679 | mMaxSize / float(initialSize.ascent + initialSize.descent); |
| 680 | container.ascent = |
| 681 | std::min(container.ascent, nscoord(initialSize.ascent * aspect)); |
| 682 | container.descent = std::min(container.descent, |
| 683 | nscoord(initialSize.descent * aspect)); |
| 684 | // below we use a type cast instead of a conversion to avoid a VC++ |
| 685 | // bug see |
| 686 | // http://support.microsoft.com/support/kb/articles/Q115/7/05.ASP |
| 687 | container.width = std::min(container.width, (nscoord)mMaxSize); |
| 688 | } else { // multiplicative value |
| 689 | container.ascent = std::min(container.ascent, |
| 690 | nscoord(initialSize.ascent * mMaxSize)); |
| 691 | container.descent = std::min(container.descent, |
| 692 | nscoord(initialSize.descent * mMaxSize)); |
| 693 | container.width = |
| 694 | std::min(container.width, nscoord(initialSize.width * mMaxSize)); |
| 695 | } |
| 696 | |
| 697 | if (isVertical && !NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags)(NS_MATHML_OPERATOR_SYMMETRIC == ((mFlags) & NS_MATHML_OPERATOR_SYMMETRIC ))) { |
| 698 | // re-adjust to align the char with the bottom of the initial |
| 699 | // container |
| 700 | height = container.ascent + container.descent; |
| 701 | container.descent = aContainerSize.descent; |
| 702 | container.ascent = height - container.descent; |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | if (mMinSize > 0.0f) { |
| 707 | // if we are here, there is a user defined minsize ... |
| 708 | // always allow the char to stretch in its natural direction, |
| 709 | // even if it is different from the caller's direction |
| 710 | if (aStretchDirection != NS_STRETCH_DIRECTION_DEFAULT && |
| 711 | aStretchDirection != mEmbellishData.direction) { |
| 712 | aStretchDirection = NS_STRETCH_DIRECTION_DEFAULT; |
| 713 | // but when we are not honoring the requested direction |
| 714 | // we should not use the caller's container size either |
| 715 | container = initialSize; |
| 716 | } |
| 717 | if (NS_MATHML_OPERATOR_MINSIZE_IS_ABSOLUTE(mFlags)(NS_MATHML_OPERATOR_MINSIZE_ABSOLUTE == ((mFlags) & NS_MATHML_OPERATOR_MINSIZE_ABSOLUTE ))) { |
| 718 | // there is an explicit value like minsize="20pt" |
| 719 | // try to maintain the aspect ratio of the char |
| 720 | float aspect = |
| 721 | mMinSize / float(initialSize.ascent + initialSize.descent); |
| 722 | container.ascent = |
| 723 | std::max(container.ascent, nscoord(initialSize.ascent * aspect)); |
| 724 | container.descent = std::max(container.descent, |
| 725 | nscoord(initialSize.descent * aspect)); |
| 726 | container.width = std::max(container.width, (nscoord)mMinSize); |
| 727 | } else { // multiplicative value |
| 728 | container.ascent = std::max(container.ascent, |
| 729 | nscoord(initialSize.ascent * mMinSize)); |
| 730 | container.descent = std::max(container.descent, |
| 731 | nscoord(initialSize.descent * mMinSize)); |
| 732 | container.width = |
| 733 | std::max(container.width, nscoord(initialSize.width * mMinSize)); |
| 734 | } |
| 735 | |
| 736 | if (isVertical && !NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags)(NS_MATHML_OPERATOR_SYMMETRIC == ((mFlags) & NS_MATHML_OPERATOR_SYMMETRIC ))) { |
| 737 | // re-adjust to align the char with the bottom of the initial |
| 738 | // container |
| 739 | height = container.ascent + container.descent; |
| 740 | container.descent = aContainerSize.descent; |
| 741 | container.ascent = height - container.descent; |
| 742 | } |
| 743 | } |
| 744 | } |
| 745 | |
| 746 | // let the MathMLChar stretch itself... |
| 747 | nsresult res = mMathMLChar.Stretch( |
| 748 | this, aDrawTarget, fontSizeInflation, aStretchDirection, container, |
| 749 | charSize, stretchHint, |
| 750 | StyleVisibility()->mDirection == StyleDirection::Rtl); |
| 751 | if (NS_FAILED(res)((bool)(__builtin_expect(!!(NS_FAILED_impl(res)), 0)))) { |
| 752 | // gracefully handle cases where stretching the char failed (i.e., |
| 753 | // GetBoundingMetrics failed) clear our 'form' to behave as if the |
| 754 | // operator wasn't in the dictionary |
| 755 | mFlags &= ~NS_MATHML_OPERATOR_FORM; |
| 756 | useMathMLChar = false; |
| 757 | } |
| 758 | } |
| 759 | |
| 760 | // Place our children using the default method and no border/padding. |
| 761 | // This will allow our child text frame to get its DidReflow() |
| 762 | PlaceFlags flags(PlaceFlag::IgnoreBorderPadding, |
| 763 | PlaceFlag::DoNotAdjustForWidthAndHeight); |
| 764 | nsresult rv = Place(aDrawTarget, flags, aDesiredStretchSize); |
| 765 | if (NS_FAILED(rv)((bool)(__builtin_expect(!!(NS_FAILED_impl(rv)), 0)))) { |
| 766 | // Make sure the child frames get their DidReflow() calls. |
| 767 | DidReflowChildren(mFrames.FirstChild()); |
| 768 | } |
| 769 | |
| 770 | if (useMathMLChar) { |
| 771 | // update our bounding metrics... it becomes that of our MathML char |
| 772 | mBoundingMetrics = charSize; |
| 773 | |
| 774 | // if the returned direction is 'unsupported', the char didn't actually |
| 775 | // change. So we do the centering only if necessary |
| 776 | if (mMathMLChar.GetStretchDirection() != NS_STRETCH_DIRECTION_UNSUPPORTED || |
| 777 | NS_MATHML_OPERATOR_IS_CENTERED(mFlags)(NS_MATHML_OPERATOR_CENTERED == ((mFlags) & NS_MATHML_OPERATOR_CENTERED ))) { |
| 778 | bool largeopOnly = (NS_STRETCH_LARGEOP & stretchHint) != 0 && |
| 779 | (NS_STRETCH_VARIABLE_MASK & stretchHint) == 0; |
| 780 | |
| 781 | if (isVertical || NS_MATHML_OPERATOR_IS_CENTERED(mFlags)(NS_MATHML_OPERATOR_CENTERED == ((mFlags) & NS_MATHML_OPERATOR_CENTERED ))) { |
| 782 | // the desired size returned by mMathMLChar maybe different |
| 783 | // from the size of the container. |
| 784 | // the mMathMLChar.mRect.y calculation is subtle, watch out!!! |
| 785 | |
| 786 | height = mBoundingMetrics.ascent + mBoundingMetrics.descent; |
| 787 | if (NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags)(NS_MATHML_OPERATOR_SYMMETRIC == ((mFlags) & NS_MATHML_OPERATOR_SYMMETRIC )) || |
| 788 | NS_MATHML_OPERATOR_IS_CENTERED(mFlags)(NS_MATHML_OPERATOR_CENTERED == ((mFlags) & NS_MATHML_OPERATOR_CENTERED ))) { |
| 789 | // For symmetric and vertical operators, or for operators that are |
| 790 | // always centered ('+', '*', etc) we want to center about the axis of |
| 791 | // the container |
| 792 | mBoundingMetrics.descent = height / 2 - axisHeight; |
| 793 | } else if (!largeopOnly) { |
| 794 | // Align the center of the char with the center of the container |
| 795 | mBoundingMetrics.descent = |
| 796 | height / 2 + (container.ascent + container.descent) / 2 - |
| 797 | container.ascent; |
| 798 | } // else align the baselines |
| 799 | mBoundingMetrics.ascent = height - mBoundingMetrics.descent; |
| 800 | } |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | // Fixup for the final height. |
| 805 | // On one hand, our stretchy height can sometimes be shorter than surrounding |
| 806 | // ASCII chars, e.g., arrow symbols have |mBoundingMetrics.ascent + leading| |
| 807 | // that is smaller than the ASCII's ascent, hence when painting the background |
| 808 | // later, it won't look uniform along the line. |
| 809 | // On the other hand, sometimes we may leave too much gap when our glyph |
| 810 | // happens to come from a font with tall glyphs. For example, since CMEX10 has |
| 811 | // very tall glyphs, its natural font metrics are large, even if we pick a |
| 812 | // small glyph whose size is comparable to the size of a normal ASCII glyph. |
| 813 | // So to avoid uneven spacing in either of these two cases, we use the height |
| 814 | // of the ASCII font as a reference and try to match it if possible. |
| 815 | |
| 816 | // special case for accents... keep them short to improve mouse operations... |
| 817 | // an accent can only be the non-first child of <mover>, <munder>, |
| 818 | // <munderover> |
| 819 | bool isAccent = NS_MATHML_EMBELLISH_IS_ACCENT(mEmbellishData.flags)(0x00000004 == ((mEmbellishData.flags) & 0x00000004)); |
| 820 | if (isAccent) { |
| 821 | nsEmbellishData parentData; |
| 822 | GetEmbellishDataFrom(GetParent(), parentData); |
| 823 | isAccent = (NS_MATHML_EMBELLISH_IS_ACCENTOVER(parentData.flags)(0x00000008 == ((parentData.flags) & 0x00000008)) || |
| 824 | NS_MATHML_EMBELLISH_IS_ACCENTUNDER(parentData.flags)(0x00000010 == ((parentData.flags) & 0x00000010))) && |
| 825 | parentData.coreFrame != this; |
| 826 | } |
| 827 | if (isAccent && firstChild) { |
| 828 | // see bug 188467 for what is going on here |
| 829 | nscoord dy = aDesiredStretchSize.BlockStartAscent() - |
| 830 | (mBoundingMetrics.ascent + leading); |
| 831 | aDesiredStretchSize.SetBlockStartAscent(mBoundingMetrics.ascent + leading); |
| 832 | aDesiredStretchSize.Height() = |
| 833 | aDesiredStretchSize.BlockStartAscent() + mBoundingMetrics.descent; |
| 834 | |
| 835 | firstChild->SetPosition(firstChild->GetPosition() - nsPoint(0, dy)); |
| 836 | } else if (useMathMLChar) { |
| 837 | nscoord ascent = fm->MaxAscent(); |
| 838 | nscoord descent = fm->MaxDescent(); |
| 839 | aDesiredStretchSize.SetBlockStartAscent( |
| 840 | std::max(mBoundingMetrics.ascent + leading, ascent)); |
| 841 | aDesiredStretchSize.Height() = |
| 842 | aDesiredStretchSize.BlockStartAscent() + |
| 843 | std::max(mBoundingMetrics.descent + leading, descent); |
| 844 | } |
| 845 | aDesiredStretchSize.Width() = mBoundingMetrics.width; |
| 846 | aDesiredStretchSize.mBoundingMetrics = mBoundingMetrics; |
| 847 | mReference.x = 0; |
| 848 | mReference.y = aDesiredStretchSize.BlockStartAscent(); |
| 849 | // Place our mMathMLChar, its origin is in our coordinate system |
| 850 | if (useMathMLChar) { |
| 851 | nscoord dy = |
| 852 | aDesiredStretchSize.BlockStartAscent() - mBoundingMetrics.ascent; |
| 853 | mMathMLChar.SetRect( |
| 854 | nsRect(0, dy, charSize.width, charSize.ascent + charSize.descent)); |
| 855 | } |
| 856 | |
| 857 | // Before we leave... there is a last item in the check-list: |
| 858 | // If our parent is not embellished, it means we are the outermost embellished |
| 859 | // container and so we put the spacing, otherwise we don't include the |
| 860 | // spacing, the outermost embellished container will take care of it. |
| 861 | |
| 862 | nscoord leadingSpace = 0, trailingSpace = 0; |
| 863 | if (!NS_MATHML_OPERATOR_HAS_EMBELLISH_ANCESTOR(mFlags)(NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR == ((mFlags) & NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR ))) { |
| 864 | // Account the spacing if we are not an accent with explicit attributes |
| 865 | if (!isAccent || NS_MATHML_OPERATOR_HAS_LSPACE_ATTR(mFlags)(NS_MATHML_OPERATOR_LSPACE_ATTR == ((mFlags) & NS_MATHML_OPERATOR_LSPACE_ATTR ))) { |
| 866 | leadingSpace = mEmbellishData.leadingSpace; |
| 867 | } |
| 868 | if (!isAccent || NS_MATHML_OPERATOR_HAS_RSPACE_ATTR(mFlags)(NS_MATHML_OPERATOR_RSPACE_ATTR == ((mFlags) & NS_MATHML_OPERATOR_RSPACE_ATTR ))) { |
| 869 | trailingSpace = mEmbellishData.trailingSpace; |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | flags = PlaceFlags(); |
| 874 | auto sizes = GetWidthAndHeightForPlaceAdjustment(flags); |
| 875 | auto borderPadding = GetBorderPaddingForPlace(flags); |
| 876 | if (leadingSpace || trailingSpace || !borderPadding.IsAllZero() || |
| 877 | sizes.width || sizes.height) { |
| 878 | mBoundingMetrics.width += leadingSpace + trailingSpace; |
| 879 | aDesiredStretchSize.Width() = mBoundingMetrics.width; |
| 880 | aDesiredStretchSize.mBoundingMetrics.width = mBoundingMetrics.width; |
| 881 | |
| 882 | nscoord dx = StyleVisibility()->mDirection == StyleDirection::Rtl |
| 883 | ? trailingSpace |
| 884 | : leadingSpace; |
| 885 | mBoundingMetrics.leftBearing += dx; |
| 886 | mBoundingMetrics.rightBearing += dx; |
| 887 | aDesiredStretchSize.mBoundingMetrics.leftBearing += dx; |
| 888 | aDesiredStretchSize.mBoundingMetrics.rightBearing += dx; |
| 889 | |
| 890 | // Apply inline/block sizes to math content box. |
| 891 | dx += ApplyAdjustmentForWidthAndHeight(flags, sizes, aDesiredStretchSize, |
| 892 | mBoundingMetrics); |
| 893 | |
| 894 | // Add border/padding. |
| 895 | InflateReflowAndBoundingMetrics(borderPadding, aDesiredStretchSize, |
| 896 | mBoundingMetrics); |
| 897 | dx += borderPadding.left; |
| 898 | nscoord dy = borderPadding.top; |
| 899 | |
| 900 | if (dx || dy) { |
| 901 | // adjust the offsets |
| 902 | |
| 903 | if (useMathMLChar) { |
| 904 | nsRect rect; |
| 905 | mMathMLChar.GetRect(rect); |
| 906 | mMathMLChar.SetRect( |
| 907 | nsRect(rect.x + dx, rect.y + dy, rect.width, rect.height)); |
| 908 | } else { |
| 909 | nsIFrame* childFrame = firstChild; |
| 910 | while (childFrame) { |
| 911 | childFrame->SetPosition(childFrame->GetPosition() + nsPoint(dx, dy)); |
| 912 | childFrame = childFrame->GetNextSibling(); |
| 913 | } |
| 914 | } |
| 915 | } |
| 916 | } |
| 917 | |
| 918 | // Finished with these: |
| 919 | ClearSavedChildMetrics(); |
| 920 | // Set our overflow area |
| 921 | GatherAndStoreOverflow(&aDesiredStretchSize); |
| 922 | |
| 923 | // There used to be code here to change the height of the child frame to |
| 924 | // change the caret height, but the text frame that manages the caret is now |
| 925 | // not a direct child but wrapped in a block frame. See also bug 412033. |
| 926 | |
| 927 | return NS_OK; |
| 928 | } |
| 929 | |
| 930 | NS_IMETHODIMPnsresult |
| 931 | nsMathMLmoFrame::InheritAutomaticData(nsIFrame* aParent) { |
| 932 | // retain our native direction, it only changes if our text content changes |
| 933 | nsStretchDirection direction = mEmbellishData.direction; |
| 934 | nsMathMLTokenFrame::InheritAutomaticData(aParent); |
| 935 | ProcessTextData(); |
| 936 | mEmbellishData.direction = direction; |
| 937 | return NS_OK; |
| 938 | } |
| 939 | |
| 940 | NS_IMETHODIMPnsresult |
| 941 | nsMathMLmoFrame::TransmitAutomaticData() { |
| 942 | // this will cause us to re-sync our flags from scratch |
| 943 | // but our returned 'form' is still not final (bug 133429), it will |
| 944 | // be recomputed to its final value during the next call in Reflow() |
| 945 | mEmbellishData.coreFrame = nullptr; |
| 946 | ProcessOperatorData(); |
| 947 | return NS_OK; |
| 948 | } |
| 949 | |
| 950 | void nsMathMLmoFrame::SetInitialChildList(ChildListID aListID, |
| 951 | nsFrameList&& aChildList) { |
| 952 | // First, let the parent class do its work |
| 953 | nsMathMLTokenFrame::SetInitialChildList(aListID, std::move(aChildList)); |
| 954 | ProcessTextData(); |
| 955 | } |
| 956 | |
| 957 | void nsMathMLmoFrame::Reflow(nsPresContext* aPresContext, |
| 958 | ReflowOutput& aDesiredSize, |
| 959 | const ReflowInput& aReflowInput, |
| 960 | nsReflowStatus& aStatus) { |
| 961 | MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!")do { static_assert( mozilla::detail::AssertionConditionType< decltype(aStatus.IsEmpty())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aStatus.IsEmpty()))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aStatus.IsEmpty()" " (" "Caller should pass a fresh reflow status!" ")", "/var/lib/jenkins/workspace/firefox-scan-build/layout/mathml/nsMathMLmoFrame.cpp" , 961); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aStatus.IsEmpty()" ") (" "Caller should pass a fresh reflow status!" ")"); do { *((volatile int*)__null) = 961; __attribute__((nomerge)) ::abort (); } while (false); } } while (false); |
| 962 | |
| 963 | // certain values use units that depend on our ComputedStyle, so |
| 964 | // it is safer to just process the whole lot here |
| 965 | ProcessOperatorData(); |
| 966 | |
| 967 | nsMathMLTokenFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus); |
| 968 | } |
| 969 | |
| 970 | nsresult nsMathMLmoFrame::Place(DrawTarget* aDrawTarget, |
| 971 | const PlaceFlags& aFlags, |
| 972 | ReflowOutput& aDesiredSize) { |
| 973 | nsresult rv = nsMathMLTokenFrame::Place(aDrawTarget, aFlags, aDesiredSize); |
| 974 | |
| 975 | if (NS_FAILED(rv)((bool)(__builtin_expect(!!(NS_FAILED_impl(rv)), 0)))) { |
| 976 | return rv; |
| 977 | } |
| 978 | |
| 979 | /* Special behaviour for largeops. |
| 980 | In MathML "stretchy" and displaystyle "largeop" are different notions, |
| 981 | even if we use the same technique to draw them (picking size variants). |
| 982 | So largeop display operators should be considered "non-stretchy" and |
| 983 | thus their sizes should be taken into account for the stretch size of |
| 984 | other elements. |
| 985 | |
| 986 | This is a preliminary stretch - exact sizing/placement is handled by the |
| 987 | Stretch() method. |
| 988 | */ |
| 989 | |
| 990 | if (aFlags.contains(PlaceFlag::MeasureOnly) && |
| 991 | StyleFont()->mMathStyle == StyleMathStyle::Normal && |
| 992 | NS_MATHML_OPERATOR_IS_LARGEOP(mFlags)(NS_MATHML_OPERATOR_LARGEOP == ((mFlags) & NS_MATHML_OPERATOR_LARGEOP )) && UseMathMLChar()) { |
| 993 | nsBoundingMetrics newMetrics; |
| 994 | rv = mMathMLChar.Stretch( |
| 995 | this, aDrawTarget, nsLayoutUtils::FontSizeInflationFor(this), |
| 996 | NS_STRETCH_DIRECTION_VERTICAL, aDesiredSize.mBoundingMetrics, |
| 997 | newMetrics, NS_STRETCH_LARGEOP, |
| 998 | StyleVisibility()->mDirection == StyleDirection::Rtl); |
| 999 | |
| 1000 | if (NS_FAILED(rv)((bool)(__builtin_expect(!!(NS_FAILED_impl(rv)), 0)))) { |
| 1001 | // Just use the initial size |
| 1002 | return NS_OK; |
| 1003 | } |
| 1004 | |
| 1005 | aDesiredSize.mBoundingMetrics = newMetrics; |
| 1006 | /* Treat the ascent/descent values calculated in the TokenFrame place |
| 1007 | calculations as the minimum for aDesiredSize calculations, rather |
| 1008 | than fetching them from font metrics again. |
| 1009 | */ |
| 1010 | aDesiredSize.SetBlockStartAscent( |
| 1011 | std::max(mBoundingMetrics.ascent, newMetrics.ascent)); |
| 1012 | aDesiredSize.Height() = |
| 1013 | aDesiredSize.BlockStartAscent() + |
| 1014 | std::max(mBoundingMetrics.descent, newMetrics.descent); |
| 1015 | aDesiredSize.Width() = newMetrics.width; |
| 1016 | mBoundingMetrics = newMetrics; |
| 1017 | } |
| 1018 | return NS_OK; |
| 1019 | } |
| 1020 | |
| 1021 | /* virtual */ |
| 1022 | void nsMathMLmoFrame::MarkIntrinsicISizesDirty() { |
| 1023 | // if we get this, it may mean that something changed in the text |
| 1024 | // content. So blow away everything an re-build the automatic data |
| 1025 | // from the parent of our outermost embellished container (we ensure |
| 1026 | // that we are the core, not just a sibling of the core) |
| 1027 | |
| 1028 | ProcessTextData(); |
| 1029 | |
| 1030 | nsIFrame* target = this; |
| 1031 | nsEmbellishData embellishData; |
| 1032 | do { |
| 1033 | target = target->GetParent(); |
| 1034 | GetEmbellishDataFrom(target, embellishData); |
| 1035 | } while (embellishData.coreFrame == this); |
| 1036 | |
| 1037 | // we have automatic data to update in the children of the target frame |
| 1038 | // XXXldb This should really be marking dirty rather than rebuilding |
| 1039 | // so that we don't rebuild multiple times for the same change. |
| 1040 | RebuildAutomaticDataForChildren(target); |
| 1041 | |
| 1042 | nsMathMLContainerFrame::MarkIntrinsicISizesDirty(); |
| 1043 | } |
| 1044 | |
| 1045 | /* virtual */ |
| 1046 | void nsMathMLmoFrame::GetIntrinsicISizeMetrics(gfxContext* aRenderingContext, |
| 1047 | ReflowOutput& aDesiredSize) { |
| 1048 | ProcessOperatorData(); |
| 1049 | if (UseMathMLChar()) { |
| 1050 | uint32_t stretchHint = |
| 1051 | GetStretchHint(mFlags, mPresentationData, true, StyleFont()); |
| 1052 | aDesiredSize.Width() = mMathMLChar.GetMaxWidth( |
| 1053 | this, aRenderingContext->GetDrawTarget(), |
| 1054 | nsLayoutUtils::FontSizeInflationFor(this), stretchHint); |
| 1055 | aDesiredSize.Width() += IntrinsicISizeOffsets().BorderPadding(); |
| 1056 | } else { |
| 1057 | nsMathMLTokenFrame::GetIntrinsicISizeMetrics(aRenderingContext, |
| 1058 | aDesiredSize); |
| 1059 | } |
| 1060 | |
| 1061 | // leadingSpace and trailingSpace are actually applied to the outermost |
| 1062 | // embellished container but for determining total intrinsic width it should |
| 1063 | // be safe to include it for the core here instead. |
| 1064 | bool isRTL = StyleVisibility()->mDirection == StyleDirection::Rtl; |
| 1065 | aDesiredSize.Width() += |
| 1066 | mEmbellishData.leadingSpace + mEmbellishData.trailingSpace; |
| 1067 | aDesiredSize.mBoundingMetrics.width = aDesiredSize.Width(); |
| 1068 | if (isRTL) { |
| 1069 | aDesiredSize.mBoundingMetrics.leftBearing += mEmbellishData.trailingSpace; |
| 1070 | aDesiredSize.mBoundingMetrics.rightBearing += mEmbellishData.trailingSpace; |
| 1071 | } else { |
| 1072 | aDesiredSize.mBoundingMetrics.leftBearing += mEmbellishData.leadingSpace; |
| 1073 | aDesiredSize.mBoundingMetrics.rightBearing += mEmbellishData.leadingSpace; |
| 1074 | } |
| 1075 | } |
| 1076 | |
| 1077 | nsresult nsMathMLmoFrame::AttributeChanged(int32_t aNameSpaceID, |
| 1078 | nsAtom* aAttribute, |
| 1079 | int32_t aModType) { |
| 1080 | // check if this is an attribute that can affect the embellished hierarchy |
| 1081 | // in a significant way and re-layout the entire hierarchy. |
| 1082 | // This is not needed for the fence and separator |
| 1083 | // attributes, since they have no visual effect. |
| 1084 | if (aAttribute == nsGkAtoms::accent_ || aAttribute == nsGkAtoms::form || |
| 1085 | aAttribute == nsGkAtoms::largeop_ || aAttribute == nsGkAtoms::maxsize_ || |
| 1086 | aAttribute == nsGkAtoms::minsize_ || |
| 1087 | aAttribute == nsGkAtoms::movablelimits_ || |
| 1088 | aAttribute == nsGkAtoms::rspace_ || aAttribute == nsGkAtoms::stretchy_ || |
| 1089 | aAttribute == nsGkAtoms::symmetric_ || aAttribute == nsGkAtoms::lspace_) { |
| 1090 | // set the target as the parent of our outermost embellished container |
| 1091 | // (we ensure that we are the core, not just a sibling of the core) |
| 1092 | nsIFrame* target = this; |
| 1093 | nsEmbellishData embellishData; |
| 1094 | do { |
| 1095 | target = target->GetParent(); |
| 1096 | GetEmbellishDataFrom(target, embellishData); |
| 1097 | } while (embellishData.coreFrame == this); |
| 1098 | |
| 1099 | // we have automatic data to update in the children of the target frame |
| 1100 | return ReLayoutChildren(target); |
| 1101 | } |
| 1102 | |
| 1103 | return nsMathMLTokenFrame::AttributeChanged(aNameSpaceID, aAttribute, |
| 1104 | aModType); |
| 1105 | } |
| 1106 | |
| 1107 | void nsMathMLmoFrame::DidSetComputedStyle(ComputedStyle* aOldStyle) { |
| 1108 | nsMathMLTokenFrame::DidSetComputedStyle(aOldStyle); |
| 1109 | mMathMLChar.SetComputedStyle(Style()); |
| 1110 | } |