File: | var/lib/jenkins/workspace/firefox-scan-build/layout/mathml/nsMathMLmmultiscriptsFrame.cpp |
Warning: | line 470, column 9 Value stored to 'trySupScriptShift' 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 "nsMathMLmmultiscriptsFrame.h" |
8 | |
9 | #include "mozilla/dom/Document.h" |
10 | #include "mozilla/dom/Element.h" |
11 | #include "mozilla/PresShell.h" |
12 | #include "mozilla/StaticPrefs_mathml.h" |
13 | #include "nsLayoutUtils.h" |
14 | #include "nsPresContext.h" |
15 | #include <algorithm> |
16 | #include "gfxContext.h" |
17 | #include "gfxMathTable.h" |
18 | #include "gfxTextRun.h" |
19 | |
20 | using namespace mozilla; |
21 | |
22 | // |
23 | // <mmultiscripts> -- attach prescripts and tensor indices to a base - |
24 | // implementation <msub> -- attach a subscript to a base - implementation |
25 | // <msubsup> -- attach a subscript-superscript pair to a base - implementation |
26 | // <msup> -- attach a superscript to a base - implementation |
27 | // |
28 | |
29 | nsIFrame* NS_NewMathMLmmultiscriptsFrame(PresShell* aPresShell, |
30 | ComputedStyle* aStyle) { |
31 | return new (aPresShell) |
32 | nsMathMLmmultiscriptsFrame(aStyle, aPresShell->GetPresContext()); |
33 | } |
34 | |
35 | NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmmultiscriptsFrame)void* nsMathMLmmultiscriptsFrame ::operator new(size_t sz, mozilla ::PresShell * aShell) { return aShell->AllocateFrame(nsQueryFrame ::nsMathMLmmultiscriptsFrame_id, sz); } |
36 | |
37 | nsMathMLmmultiscriptsFrame::~nsMathMLmmultiscriptsFrame() = default; |
38 | |
39 | uint8_t nsMathMLmmultiscriptsFrame::ScriptIncrement(nsIFrame* aFrame) { |
40 | if (!aFrame) return 0; |
41 | if (mFrames.ContainsFrame(aFrame)) { |
42 | if (mFrames.FirstChild() == aFrame || |
43 | aFrame->GetContent()->IsMathMLElement(nsGkAtoms::mprescripts_)) { |
44 | return 0; // No script increment for base frames or prescript markers |
45 | } |
46 | return 1; |
47 | } |
48 | return 0; // not a child |
49 | } |
50 | |
51 | NS_IMETHODIMPnsresult |
52 | nsMathMLmmultiscriptsFrame::TransmitAutomaticData() { |
53 | // if our base is an embellished operator, let its state bubble to us |
54 | mPresentationData.baseFrame = mFrames.FirstChild(); |
55 | GetEmbellishDataFrom(mPresentationData.baseFrame, mEmbellishData); |
56 | |
57 | // The TeXbook (Ch 17. p.141) says the superscript inherits the compression |
58 | // while the subscript is compressed. So here we collect subscripts and set |
59 | // the compression flag in them. |
60 | |
61 | int32_t count = 0; |
62 | bool isSubScript = !mContent->IsMathMLElement(nsGkAtoms::msup_); |
63 | |
64 | AutoTArray<nsIFrame*, 8> subScriptFrames; |
65 | nsIFrame* childFrame = mFrames.FirstChild(); |
66 | while (childFrame) { |
67 | if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::mprescripts_)) { |
68 | // mprescripts frame |
69 | } else if (0 == count) { |
70 | // base frame |
71 | } else { |
72 | // super/subscript block |
73 | if (isSubScript) { |
74 | // subscript |
75 | subScriptFrames.AppendElement(childFrame); |
76 | } else { |
77 | // superscript |
78 | } |
79 | PropagateFrameFlagFor(childFrame, NS_FRAME_MATHML_SCRIPT_DESCENDANT); |
80 | isSubScript = !isSubScript; |
81 | } |
82 | count++; |
83 | childFrame = childFrame->GetNextSibling(); |
84 | } |
85 | for (int32_t i = subScriptFrames.Length() - 1; i >= 0; i--) { |
86 | childFrame = subScriptFrames[i]; |
87 | PropagatePresentationDataFor(childFrame, NS_MATHML_COMPRESSED0x00000002U, |
88 | NS_MATHML_COMPRESSED0x00000002U); |
89 | } |
90 | |
91 | return NS_OK; |
92 | } |
93 | |
94 | /* virtual */ |
95 | nsresult nsMathMLmmultiscriptsFrame::Place(DrawTarget* aDrawTarget, |
96 | bool aPlaceOrigin, |
97 | ReflowOutput& aDesiredSize) { |
98 | nscoord subScriptShift = 0; |
99 | nscoord supScriptShift = 0; |
100 | float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this); |
101 | |
102 | return PlaceMultiScript(PresContext(), aDrawTarget, aPlaceOrigin, |
103 | aDesiredSize, this, subScriptShift, supScriptShift, |
104 | fontSizeInflation); |
105 | } |
106 | |
107 | // exported routine that both munderover and mmultiscripts share. |
108 | // munderover uses this when movablelimits is set. |
109 | nsresult nsMathMLmmultiscriptsFrame::PlaceMultiScript( |
110 | nsPresContext* aPresContext, DrawTarget* aDrawTarget, bool aPlaceOrigin, |
111 | ReflowOutput& aDesiredSize, nsMathMLContainerFrame* aFrame, |
112 | nscoord aUserSubScriptShift, nscoord aUserSupScriptShift, |
113 | float aFontSizeInflation) { |
114 | nsAtom* tag = aFrame->GetContent()->NodeInfo()->NameAtom(); |
115 | |
116 | // This function deals with both munderover etc. as well as msubsup etc. |
117 | // As the former behaves identically to the later, we treat it as such |
118 | // to avoid additional checks later. |
119 | if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::mover_)) |
120 | tag = nsGkAtoms::msup_; |
121 | else if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::munder_)) |
122 | tag = nsGkAtoms::msub_; |
123 | else if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::munderover_)) |
124 | tag = nsGkAtoms::msubsup_; |
125 | |
126 | nsBoundingMetrics bmFrame; |
127 | |
128 | nscoord minShiftFromXHeight, subDrop, supDrop; |
129 | |
130 | //////////////////////////////////////// |
131 | // Initialize super/sub shifts that |
132 | // depend only on the current font |
133 | //////////////////////////////////////// |
134 | |
135 | nsIFrame* baseFrame = aFrame->PrincipalChildList().FirstChild(); |
136 | |
137 | if (!baseFrame) { |
138 | if (tag == nsGkAtoms::mmultiscripts_) |
139 | aFrame->ReportErrorToConsole("NoBase"); |
140 | else |
141 | aFrame->ReportChildCountError(); |
142 | return aFrame->PlaceAsMrow(aDrawTarget, aPlaceOrigin, aDesiredSize); |
143 | } |
144 | |
145 | // get x-height (an ex) |
146 | const nsStyleFont* font = aFrame->StyleFont(); |
147 | RefPtr<nsFontMetrics> fm = |
148 | nsLayoutUtils::GetFontMetricsForFrame(baseFrame, aFontSizeInflation); |
149 | |
150 | nscoord xHeight = fm->XHeight(); |
151 | |
152 | nscoord oneDevPixel = fm->AppUnitsPerDevPixel(); |
153 | RefPtr<gfxFont> mathFont = fm->GetThebesFontGroup()->GetFirstMathFont(); |
154 | // scriptspace from TeX for extra spacing after sup/subscript |
155 | nscoord scriptSpace; |
156 | if (mathFont) { |
157 | scriptSpace = mathFont->MathTable()->Constant( |
158 | gfxMathTable::SpaceAfterScript, oneDevPixel); |
159 | } else { |
160 | // (0.5pt in plain TeX) |
161 | scriptSpace = nsPresContext::CSSPointsToAppUnits(0.5f); |
162 | } |
163 | |
164 | // Try and read sub and sup drops from the MATH table. |
165 | if (mathFont) { |
166 | subDrop = mathFont->MathTable()->Constant( |
167 | gfxMathTable::SubscriptBaselineDropMin, oneDevPixel); |
168 | supDrop = mathFont->MathTable()->Constant( |
169 | gfxMathTable::SuperscriptBaselineDropMax, oneDevPixel); |
170 | } |
171 | |
172 | // force the scriptSpace to be at least 1 pixel |
173 | nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1); |
174 | scriptSpace = std::max(onePixel, scriptSpace); |
175 | |
176 | ///////////////////////////////////// |
177 | // first the shift for the subscript |
178 | |
179 | nscoord subScriptShift; |
180 | if (mathFont) { |
181 | // Try and get the sub script shift from the MATH table. Note that contrary |
182 | // to TeX we only have one parameter. |
183 | subScriptShift = mathFont->MathTable()->Constant( |
184 | gfxMathTable::SubscriptShiftDown, oneDevPixel); |
185 | } else { |
186 | // subScriptShift{1,2} |
187 | // = minimum amount to shift the subscript down |
188 | // = sub{1,2} in TeXbook |
189 | // subScriptShift1 = subscriptshift attribute * x-height |
190 | nscoord subScriptShift1, subScriptShift2; |
191 | // Get subScriptShift{1,2} default from font |
192 | GetSubScriptShifts(fm, subScriptShift1, subScriptShift2); |
193 | if (tag == nsGkAtoms::msub_) { |
194 | subScriptShift = subScriptShift1; |
195 | } else { |
196 | subScriptShift = std::max(subScriptShift1, subScriptShift2); |
197 | } |
198 | } |
199 | |
200 | if (0 < aUserSubScriptShift) { |
201 | // the user has set the subscriptshift attribute |
202 | subScriptShift = std::max(subScriptShift, aUserSubScriptShift); |
203 | } |
204 | |
205 | ///////////////////////////////////// |
206 | // next the shift for the superscript |
207 | |
208 | nscoord supScriptShift; |
209 | nsPresentationData presentationData; |
210 | aFrame->GetPresentationData(presentationData); |
211 | if (mathFont) { |
212 | // Try and get the super script shift from the MATH table. Note that |
213 | // contrary to TeX we only have two parameters. |
214 | supScriptShift = mathFont->MathTable()->Constant( |
215 | NS_MATHML_IS_COMPRESSED(presentationData.flags)(0x00000002U == ((presentationData.flags) & 0x00000002U)) |
216 | ? gfxMathTable::SuperscriptShiftUpCramped |
217 | : gfxMathTable::SuperscriptShiftUp, |
218 | oneDevPixel); |
219 | } else { |
220 | // supScriptShift{1,2,3} |
221 | // = minimum amount to shift the supscript up |
222 | // = sup{1,2,3} in TeX |
223 | // supScriptShift1 = superscriptshift attribute * x-height |
224 | // Note that there are THREE values for supscript shifts depending |
225 | // on the current style |
226 | nscoord supScriptShift1, supScriptShift2, supScriptShift3; |
227 | // Set supScriptShift{1,2,3} default from font |
228 | GetSupScriptShifts(fm, supScriptShift1, supScriptShift2, supScriptShift3); |
229 | |
230 | // get sup script shift depending on current script level and display style |
231 | // Rule 18c, App. G, TeXbook |
232 | if (font->mMathDepth == 0 && font->mMathStyle == StyleMathStyle::Normal && |
233 | !NS_MATHML_IS_COMPRESSED(presentationData.flags)(0x00000002U == ((presentationData.flags) & 0x00000002U))) { |
234 | // Style D in TeXbook |
235 | supScriptShift = supScriptShift1; |
236 | } else if (NS_MATHML_IS_COMPRESSED(presentationData.flags)(0x00000002U == ((presentationData.flags) & 0x00000002U))) { |
237 | // Style C' in TeXbook = D',T',S',SS' |
238 | supScriptShift = supScriptShift3; |
239 | } else { |
240 | // everything else = T,S,SS |
241 | supScriptShift = supScriptShift2; |
242 | } |
243 | } |
244 | |
245 | if (0 < aUserSupScriptShift) { |
246 | // the user has set the supscriptshift attribute |
247 | supScriptShift = std::max(supScriptShift, aUserSupScriptShift); |
248 | } |
249 | |
250 | //////////////////////////////////// |
251 | // Get the children's sizes |
252 | //////////////////////////////////// |
253 | |
254 | const WritingMode wm(aDesiredSize.GetWritingMode()); |
255 | nscoord width = 0, prescriptsWidth = 0, rightBearing = 0; |
256 | nscoord minSubScriptShift = 0, minSupScriptShift = 0; |
257 | nscoord trySubScriptShift = subScriptShift; |
258 | nscoord trySupScriptShift = supScriptShift; |
259 | nscoord maxSubScriptShift = subScriptShift; |
260 | nscoord maxSupScriptShift = supScriptShift; |
261 | ReflowOutput baseSize(wm); |
262 | ReflowOutput subScriptSize(wm); |
263 | ReflowOutput supScriptSize(wm); |
264 | ReflowOutput multiSubSize(wm), multiSupSize(wm); |
265 | baseFrame = nullptr; |
266 | nsIFrame* subScriptFrame = nullptr; |
267 | nsIFrame* supScriptFrame = nullptr; |
268 | nsIFrame* prescriptsFrame = nullptr; // frame of <mprescripts/>, if there. |
269 | |
270 | bool firstPrescriptsPair = false; |
271 | nsBoundingMetrics bmBase, bmSubScript, bmSupScript, bmMultiSub, bmMultiSup; |
272 | multiSubSize.SetBlockStartAscent(-0x7FFFFFFF); |
273 | multiSupSize.SetBlockStartAscent(-0x7FFFFFFF); |
274 | bmMultiSub.ascent = bmMultiSup.ascent = -0x7FFFFFFF; |
275 | bmMultiSub.descent = bmMultiSup.descent = -0x7FFFFFFF; |
276 | nscoord italicCorrection = 0; |
277 | |
278 | nsBoundingMetrics boundingMetrics; |
279 | boundingMetrics.width = 0; |
280 | boundingMetrics.ascent = boundingMetrics.descent = -0x7FFFFFFF; |
281 | aDesiredSize.Width() = aDesiredSize.Height() = 0; |
282 | |
283 | int32_t count = 0; |
284 | |
285 | // Boolean to determine whether the current child is a subscript. |
286 | // Note that only msup starts with a superscript. |
287 | bool isSubScript = (tag != nsGkAtoms::msup_); |
288 | |
289 | nsIFrame* childFrame = aFrame->PrincipalChildList().FirstChild(); |
290 | while (childFrame) { |
291 | if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::mprescripts_)) { |
292 | if (tag != nsGkAtoms::mmultiscripts_) { |
293 | if (aPlaceOrigin) { |
294 | aFrame->ReportInvalidChildError(nsGkAtoms::mprescripts_); |
295 | } |
296 | return aFrame->PlaceAsMrow(aDrawTarget, aPlaceOrigin, aDesiredSize); |
297 | } |
298 | if (prescriptsFrame) { |
299 | // duplicate <mprescripts/> found |
300 | // report an error, encourage people to get their markups in order |
301 | if (aPlaceOrigin) { |
302 | aFrame->ReportErrorToConsole("DuplicateMprescripts"); |
303 | } |
304 | return aFrame->PlaceAsMrow(aDrawTarget, aPlaceOrigin, aDesiredSize); |
305 | } |
306 | if (!isSubScript) { |
307 | if (aPlaceOrigin) { |
308 | aFrame->ReportErrorToConsole("SubSupMismatch"); |
309 | } |
310 | return aFrame->PlaceAsMrow(aDrawTarget, aPlaceOrigin, aDesiredSize); |
311 | } |
312 | |
313 | prescriptsFrame = childFrame; |
314 | firstPrescriptsPair = true; |
315 | } else if (0 == count) { |
316 | // base |
317 | baseFrame = childFrame; |
318 | GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase); |
319 | |
320 | if (tag != nsGkAtoms::msub_) { |
321 | // Apply italics correction if there is the potential for a |
322 | // postsupscript. |
323 | GetItalicCorrection(bmBase, italicCorrection); |
324 | // If italics correction is applied, we always add "a little to spare" |
325 | // (see TeXbook Ch.11, p.64), as we estimate the italic creation |
326 | // ourselves and it isn't the same as TeX. |
327 | italicCorrection += onePixel; |
328 | } |
329 | |
330 | // we update boundingMetrics.{ascent,descent} with that |
331 | // of the baseFrame only after processing all the sup/sub pairs |
332 | boundingMetrics.width = bmBase.width; |
333 | boundingMetrics.rightBearing = bmBase.rightBearing; |
334 | boundingMetrics.leftBearing = bmBase.leftBearing; // until overwritten |
335 | } else { |
336 | // super/subscript block |
337 | if (isSubScript) { |
338 | // subscript |
339 | subScriptFrame = childFrame; |
340 | GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, |
341 | bmSubScript); |
342 | if (!mathFont) { |
343 | // get the subdrop from the subscript font |
344 | GetSubDropFromChild(subScriptFrame, subDrop, aFontSizeInflation); |
345 | } |
346 | |
347 | // parameter v, Rule 18a, App. G, TeXbook |
348 | minSubScriptShift = bmBase.descent + subDrop; |
349 | trySubScriptShift = std::max(minSubScriptShift, subScriptShift); |
350 | multiSubSize.SetBlockStartAscent(std::max( |
351 | multiSubSize.BlockStartAscent(), subScriptSize.BlockStartAscent())); |
352 | bmMultiSub.ascent = std::max(bmMultiSub.ascent, bmSubScript.ascent); |
353 | bmMultiSub.descent = std::max(bmMultiSub.descent, bmSubScript.descent); |
354 | multiSubSize.Height() = |
355 | std::max(multiSubSize.Height(), |
356 | subScriptSize.Height() - subScriptSize.BlockStartAscent()); |
357 | if (bmSubScript.width) width = bmSubScript.width + scriptSpace; |
358 | rightBearing = bmSubScript.rightBearing; |
359 | |
360 | if (tag == nsGkAtoms::msub_) { |
361 | boundingMetrics.rightBearing = boundingMetrics.width + rightBearing; |
362 | boundingMetrics.width += width; |
363 | |
364 | nscoord subscriptTopMax; |
365 | if (mathFont) { |
366 | subscriptTopMax = mathFont->MathTable()->Constant( |
367 | gfxMathTable::SubscriptTopMax, oneDevPixel); |
368 | } else { |
369 | // get min subscript shift limit from x-height |
370 | // = h(x) - 4/5 * sigma_5, Rule 18b, App. G, TeXbook |
371 | subscriptTopMax = NSToCoordRound((4.0f / 5.0f) * xHeight); |
372 | } |
373 | nscoord minShiftFromXHeight = bmSubScript.ascent - subscriptTopMax; |
374 | maxSubScriptShift = std::max(trySubScriptShift, minShiftFromXHeight); |
375 | |
376 | maxSubScriptShift = std::max(maxSubScriptShift, trySubScriptShift); |
377 | trySubScriptShift = subScriptShift; |
378 | } |
379 | } else { |
380 | // supscript |
381 | supScriptFrame = childFrame; |
382 | GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, |
383 | bmSupScript); |
384 | if (!mathFont) { |
385 | // get the supdrop from the supscript font |
386 | GetSupDropFromChild(supScriptFrame, supDrop, aFontSizeInflation); |
387 | } |
388 | // parameter u, Rule 18a, App. G, TeXbook |
389 | minSupScriptShift = bmBase.ascent - supDrop; |
390 | nscoord superscriptBottomMin; |
391 | if (mathFont) { |
392 | superscriptBottomMin = mathFont->MathTable()->Constant( |
393 | gfxMathTable::SuperscriptBottomMin, oneDevPixel); |
394 | } else { |
395 | // get min supscript shift limit from x-height |
396 | // = d(x) + 1/4 * sigma_5, Rule 18c, App. G, TeXbook |
397 | superscriptBottomMin = NSToCoordRound((1.0f / 4.0f) * xHeight); |
398 | } |
399 | minShiftFromXHeight = bmSupScript.descent + superscriptBottomMin; |
400 | trySupScriptShift = std::max( |
401 | minSupScriptShift, std::max(minShiftFromXHeight, supScriptShift)); |
402 | multiSupSize.SetBlockStartAscent(std::max( |
403 | multiSupSize.BlockStartAscent(), supScriptSize.BlockStartAscent())); |
404 | bmMultiSup.ascent = std::max(bmMultiSup.ascent, bmSupScript.ascent); |
405 | bmMultiSup.descent = std::max(bmMultiSup.descent, bmSupScript.descent); |
406 | multiSupSize.Height() = |
407 | std::max(multiSupSize.Height(), |
408 | supScriptSize.Height() - supScriptSize.BlockStartAscent()); |
409 | |
410 | if (bmSupScript.width) |
411 | width = std::max(width, bmSupScript.width + scriptSpace); |
412 | |
413 | if (!prescriptsFrame) { // we are still looping over base & postscripts |
414 | rightBearing = std::max(rightBearing, |
415 | italicCorrection + bmSupScript.rightBearing); |
416 | boundingMetrics.rightBearing = boundingMetrics.width + rightBearing; |
417 | boundingMetrics.width += width; |
418 | } else { |
419 | prescriptsWidth += width; |
420 | if (firstPrescriptsPair) { |
421 | firstPrescriptsPair = false; |
422 | boundingMetrics.leftBearing = |
423 | std::min(bmSubScript.leftBearing, bmSupScript.leftBearing); |
424 | } |
425 | } |
426 | width = rightBearing = 0; |
427 | |
428 | // negotiate between the various shifts so that |
429 | // there is enough gap between the sup and subscripts |
430 | // Rule 18e, App. G, TeXbook |
431 | if (tag == nsGkAtoms::mmultiscripts_ || tag == nsGkAtoms::msubsup_) { |
432 | nscoord subSuperscriptGapMin; |
433 | if (mathFont) { |
434 | subSuperscriptGapMin = mathFont->MathTable()->Constant( |
435 | gfxMathTable::SubSuperscriptGapMin, oneDevPixel); |
436 | } else { |
437 | nscoord ruleSize; |
438 | GetRuleThickness(aDrawTarget, fm, ruleSize); |
439 | subSuperscriptGapMin = 4 * ruleSize; |
440 | } |
441 | nscoord gap = (trySupScriptShift - bmSupScript.descent) - |
442 | (bmSubScript.ascent - trySubScriptShift); |
443 | if (gap < subSuperscriptGapMin) { |
444 | // adjust trySubScriptShift to get a gap of subSuperscriptGapMin |
445 | trySubScriptShift += subSuperscriptGapMin - gap; |
446 | } |
447 | |
448 | // next we want to ensure that the bottom of the superscript |
449 | // will be > superscriptBottomMaxWithSubscript |
450 | nscoord superscriptBottomMaxWithSubscript; |
451 | if (mathFont) { |
452 | superscriptBottomMaxWithSubscript = mathFont->MathTable()->Constant( |
453 | gfxMathTable::SuperscriptBottomMaxWithSubscript, oneDevPixel); |
454 | } else { |
455 | superscriptBottomMaxWithSubscript = |
456 | NSToCoordRound((4.0f / 5.0f) * xHeight); |
457 | } |
458 | gap = superscriptBottomMaxWithSubscript - |
459 | (trySupScriptShift - bmSupScript.descent); |
460 | if (gap > 0) { |
461 | trySupScriptShift += gap; |
462 | trySubScriptShift -= gap; |
463 | } |
464 | } |
465 | |
466 | maxSubScriptShift = std::max(maxSubScriptShift, trySubScriptShift); |
467 | maxSupScriptShift = std::max(maxSupScriptShift, trySupScriptShift); |
468 | |
469 | trySubScriptShift = subScriptShift; |
470 | trySupScriptShift = supScriptShift; |
Value stored to 'trySupScriptShift' is never read | |
471 | } |
472 | |
473 | isSubScript = !isSubScript; |
474 | } |
475 | count++; |
476 | childFrame = childFrame->GetNextSibling(); |
477 | } |
478 | |
479 | // NoBase error may also have been reported above |
480 | if ((count != 2 && (tag == nsGkAtoms::msup_ || tag == nsGkAtoms::msub_)) || |
481 | (count != 3 && tag == nsGkAtoms::msubsup_) || !baseFrame || |
482 | (!isSubScript && tag == nsGkAtoms::mmultiscripts_)) { |
483 | // report an error, encourage people to get their markups in order |
484 | if (aPlaceOrigin) { |
485 | if ((count != 2 && |
486 | (tag == nsGkAtoms::msup_ || tag == nsGkAtoms::msub_)) || |
487 | (count != 3 && tag == nsGkAtoms::msubsup_)) { |
488 | aFrame->ReportChildCountError(); |
489 | } else if (!baseFrame) { |
490 | aFrame->ReportErrorToConsole("NoBase"); |
491 | } else { |
492 | aFrame->ReportErrorToConsole("SubSupMismatch"); |
493 | } |
494 | } |
495 | return aFrame->PlaceAsMrow(aDrawTarget, aPlaceOrigin, aDesiredSize); |
496 | } |
497 | |
498 | // we left out the width of prescripts, so ... |
499 | boundingMetrics.rightBearing += prescriptsWidth; |
500 | boundingMetrics.width += prescriptsWidth; |
501 | |
502 | // Zero out the shifts in where a frame isn't present to avoid the potential |
503 | // for overflow. |
504 | if (!subScriptFrame) maxSubScriptShift = 0; |
505 | if (!supScriptFrame) maxSupScriptShift = 0; |
506 | |
507 | // we left out the base during our bounding box updates, so ... |
508 | if (tag == nsGkAtoms::msub_) { |
509 | boundingMetrics.ascent = |
510 | std::max(bmBase.ascent, bmMultiSub.ascent - maxSubScriptShift); |
511 | } else { |
512 | boundingMetrics.ascent = |
513 | std::max(bmBase.ascent, (bmMultiSup.ascent + maxSupScriptShift)); |
514 | } |
515 | if (tag == nsGkAtoms::msup_) { |
516 | boundingMetrics.descent = |
517 | std::max(bmBase.descent, bmMultiSup.descent - maxSupScriptShift); |
518 | } else { |
519 | boundingMetrics.descent = |
520 | std::max(bmBase.descent, (bmMultiSub.descent + maxSubScriptShift)); |
521 | } |
522 | aFrame->SetBoundingMetrics(boundingMetrics); |
523 | |
524 | // get the reflow metrics ... |
525 | aDesiredSize.SetBlockStartAscent( |
526 | std::max(baseSize.BlockStartAscent(), |
527 | std::max(multiSubSize.BlockStartAscent() - maxSubScriptShift, |
528 | multiSupSize.BlockStartAscent() + maxSupScriptShift))); |
529 | aDesiredSize.Height() = |
530 | aDesiredSize.BlockStartAscent() + |
531 | std::max(baseSize.Height() - baseSize.BlockStartAscent(), |
532 | std::max(multiSubSize.Height() + maxSubScriptShift, |
533 | multiSupSize.Height() - maxSupScriptShift)); |
534 | aDesiredSize.Width() = boundingMetrics.width; |
535 | aDesiredSize.mBoundingMetrics = boundingMetrics; |
536 | |
537 | aFrame->SetReference(nsPoint(0, aDesiredSize.BlockStartAscent())); |
538 | |
539 | ////////////////// |
540 | // Place Children |
541 | |
542 | // Place prescripts, followed by base, and then postscripts. |
543 | // The list of frames is in the order: {base} {postscripts} {prescripts} |
544 | // We go over the list in a circular manner, starting at <prescripts/> |
545 | |
546 | if (aPlaceOrigin) { |
547 | nscoord dx = 0, dy = 0; |
548 | |
549 | // With msub and msup there is only one element and |
550 | // subscriptFrame/supScriptFrame have already been set above where |
551 | // relevant. In these cases we skip to the reflow part. |
552 | if (tag == nsGkAtoms::msub_ || tag == nsGkAtoms::msup_) |
553 | count = 1; |
554 | else |
555 | count = 0; |
556 | childFrame = prescriptsFrame; |
557 | bool isPreScript = true; |
558 | do { |
559 | if (!childFrame) { // end of prescripts, |
560 | isPreScript = false; |
561 | // place the base ... |
562 | childFrame = baseFrame; |
563 | dy = aDesiredSize.BlockStartAscent() - baseSize.BlockStartAscent(); |
564 | FinishReflowChild( |
565 | baseFrame, aPresContext, baseSize, nullptr, |
566 | aFrame->MirrorIfRTL(aDesiredSize.Width(), baseSize.Width(), dx), dy, |
567 | ReflowChildFlags::Default); |
568 | dx += bmBase.width; |
569 | } else if (prescriptsFrame == childFrame) { |
570 | // Clear reflow flags of prescripts frame. |
571 | prescriptsFrame->DidReflow(aPresContext, nullptr); |
572 | } else { |
573 | // process each sup/sub pair |
574 | if (0 == count) { |
575 | subScriptFrame = childFrame; |
576 | count = 1; |
577 | } else if (1 == count) { |
578 | if (tag != nsGkAtoms::msub_) supScriptFrame = childFrame; |
579 | count = 0; |
580 | |
581 | // get the ascent/descent of sup/subscripts stored in their rects |
582 | // rect.x = descent, rect.y = ascent |
583 | if (subScriptFrame) |
584 | GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, |
585 | bmSubScript); |
586 | if (supScriptFrame) |
587 | GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, |
588 | bmSupScript); |
589 | |
590 | width = std::max(subScriptSize.Width(), supScriptSize.Width()); |
591 | |
592 | if (subScriptFrame) { |
593 | nscoord x = dx; |
594 | // prescripts should be right aligned |
595 | // https://bugzilla.mozilla.org/show_bug.cgi?id=928675 |
596 | if (isPreScript) x += width - subScriptSize.Width(); |
597 | dy = aDesiredSize.BlockStartAscent() - |
598 | subScriptSize.BlockStartAscent() + maxSubScriptShift; |
599 | FinishReflowChild(subScriptFrame, aPresContext, subScriptSize, |
600 | nullptr, |
601 | aFrame->MirrorIfRTL(aDesiredSize.Width(), |
602 | subScriptSize.Width(), x), |
603 | dy, ReflowChildFlags::Default); |
604 | } |
605 | |
606 | if (supScriptFrame) { |
607 | nscoord x = dx; |
608 | if (isPreScript) { |
609 | x += width - supScriptSize.Width(); |
610 | } else { |
611 | // post superscripts are shifted by the italic correction value |
612 | x += italicCorrection; |
613 | } |
614 | dy = aDesiredSize.BlockStartAscent() - |
615 | supScriptSize.BlockStartAscent() - maxSupScriptShift; |
616 | FinishReflowChild(supScriptFrame, aPresContext, supScriptSize, |
617 | nullptr, |
618 | aFrame->MirrorIfRTL(aDesiredSize.Width(), |
619 | supScriptSize.Width(), x), |
620 | dy, ReflowChildFlags::Default); |
621 | } |
622 | dx += width + scriptSpace; |
623 | } |
624 | } |
625 | childFrame = childFrame->GetNextSibling(); |
626 | } while (prescriptsFrame != childFrame); |
627 | } |
628 | |
629 | return NS_OK; |
630 | } |