mirror of
https://github.com/mozilla/gecko-dev.git
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995 lines
25 KiB
C++
995 lines
25 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* representation of one line within a block frame, a CSS line box */
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#include "nsLineBox.h"
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#include "mozilla/ArenaObjectID.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/Likely.h"
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#include "mozilla/WritingModes.h"
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#include "nsBidiPresUtils.h"
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#include "nsFrame.h"
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#include "nsIFrameInlines.h"
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#include "nsPresArena.h"
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#include "nsPrintfCString.h"
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#include "mozilla/Snprintf.h"
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#ifdef DEBUG
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static int32_t ctorCount;
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int32_t nsLineBox::GetCtorCount() { return ctorCount; }
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#endif
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#ifndef _MSC_VER
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// static nsLineBox constant; initialized in the header file.
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const uint32_t nsLineBox::kMinChildCountForHashtable;
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#endif
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using namespace mozilla;
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nsLineBox::nsLineBox(nsIFrame* aFrame, int32_t aCount, bool aIsBlock)
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: mFirstChild(aFrame)
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, mContainerSize(-1, -1)
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, mBounds(WritingMode()) // mBounds will be initialized with the correct
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// writing mode when it is set
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// NOTE: memory is already zeroed since we allocate with AllocateByObjectID.
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{
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MOZ_COUNT_CTOR(nsLineBox);
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#ifdef DEBUG
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++ctorCount;
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NS_ASSERTION(!aIsBlock || aCount == 1, "Blocks must have exactly one child");
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nsIFrame* f = aFrame;
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for (int32_t n = aCount; n > 0; f = f->GetNextSibling(), --n) {
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NS_ASSERTION(aIsBlock == f->IsBlockOutside(),
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"wrong kind of child frame");
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}
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#endif
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static_assert(NS_STYLE_CLEAR_MAX <= 15,
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"FlagBits needs more bits to store the full range of "
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"break type ('clear') values");
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#if NS_STYLE_CLEAR_NONE > 0
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mFlags.mBreakType = NS_STYLE_CLEAR_NONE;
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#endif
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mChildCount = aCount;
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MarkDirty();
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mFlags.mBlock = aIsBlock;
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}
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nsLineBox::~nsLineBox()
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{
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MOZ_COUNT_DTOR(nsLineBox);
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if (MOZ_UNLIKELY(mFlags.mHasHashedFrames)) {
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delete mFrames;
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}
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Cleanup();
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}
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nsLineBox*
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NS_NewLineBox(nsIPresShell* aPresShell, nsIFrame* aFrame, bool aIsBlock)
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{
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return new (aPresShell) nsLineBox(aFrame, 1, aIsBlock);
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}
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nsLineBox*
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NS_NewLineBox(nsIPresShell* aPresShell, nsLineBox* aFromLine,
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nsIFrame* aFrame, int32_t aCount)
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{
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nsLineBox* newLine = new (aPresShell) nsLineBox(aFrame, aCount, false);
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newLine->NoteFramesMovedFrom(aFromLine);
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newLine->mContainerSize = aFromLine->mContainerSize;
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return newLine;
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}
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void
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nsLineBox::StealHashTableFrom(nsLineBox* aFromLine, uint32_t aFromLineNewCount)
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{
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MOZ_ASSERT(!mFlags.mHasHashedFrames);
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MOZ_ASSERT(GetChildCount() >= int32_t(aFromLineNewCount));
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mFrames = aFromLine->mFrames;
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mFlags.mHasHashedFrames = 1;
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aFromLine->mFlags.mHasHashedFrames = 0;
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aFromLine->mChildCount = aFromLineNewCount;
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// remove aFromLine's frames that aren't on this line
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nsIFrame* f = aFromLine->mFirstChild;
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for (uint32_t i = 0; i < aFromLineNewCount; f = f->GetNextSibling(), ++i) {
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mFrames->RemoveEntry(f);
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}
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}
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void
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nsLineBox::NoteFramesMovedFrom(nsLineBox* aFromLine)
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{
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uint32_t fromCount = aFromLine->GetChildCount();
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uint32_t toCount = GetChildCount();
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MOZ_ASSERT(toCount <= fromCount, "moved more frames than aFromLine has");
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uint32_t fromNewCount = fromCount - toCount;
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if (MOZ_LIKELY(!aFromLine->mFlags.mHasHashedFrames)) {
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aFromLine->mChildCount = fromNewCount;
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MOZ_ASSERT(toCount < kMinChildCountForHashtable);
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} else if (fromNewCount < kMinChildCountForHashtable) {
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// aFromLine has a hash table but will not have it after moving the frames
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// so this line can steal the hash table if it needs it.
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if (toCount >= kMinChildCountForHashtable) {
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StealHashTableFrom(aFromLine, fromNewCount);
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} else {
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delete aFromLine->mFrames;
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aFromLine->mFlags.mHasHashedFrames = 0;
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aFromLine->mChildCount = fromNewCount;
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}
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} else {
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// aFromLine still needs a hash table.
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if (toCount < kMinChildCountForHashtable) {
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// remove the moved frames from it
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nsIFrame* f = mFirstChild;
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for (uint32_t i = 0; i < toCount; f = f->GetNextSibling(), ++i) {
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aFromLine->mFrames->RemoveEntry(f);
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}
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} else if (toCount <= fromNewCount) {
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// This line needs a hash table, allocate a hash table for it since that
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// means fewer hash ops.
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nsIFrame* f = mFirstChild;
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for (uint32_t i = 0; i < toCount; f = f->GetNextSibling(), ++i) {
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aFromLine->mFrames->RemoveEntry(f); // toCount RemoveEntry
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}
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SwitchToHashtable(); // toCount PutEntry
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} else {
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// This line needs a hash table, but it's fewer hash ops to steal
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// aFromLine's hash table and allocate a new hash table for that line.
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StealHashTableFrom(aFromLine, fromNewCount); // fromNewCount RemoveEntry
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aFromLine->SwitchToHashtable(); // fromNewCount PutEntry
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}
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}
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}
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void*
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nsLineBox::operator new(size_t sz, nsIPresShell* aPresShell) CPP_THROW_NEW
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{
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return aPresShell->AllocateByObjectID(eArenaObjectID_nsLineBox, sz);
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}
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void
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nsLineBox::Destroy(nsIPresShell* aPresShell)
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{
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this->nsLineBox::~nsLineBox();
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aPresShell->FreeByObjectID(eArenaObjectID_nsLineBox, this);
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}
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void
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nsLineBox::Cleanup()
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{
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if (mData) {
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if (IsBlock()) {
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delete mBlockData;
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}
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else {
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delete mInlineData;
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}
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mData = nullptr;
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}
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}
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#ifdef DEBUG_FRAME_DUMP
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static void
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ListFloats(FILE* out, const char* aPrefix, const nsFloatCacheList& aFloats)
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{
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nsFloatCache* fc = aFloats.Head();
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while (fc) {
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nsCString str(aPrefix);
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nsIFrame* frame = fc->mFloat;
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str += nsPrintfCString("floatframe@%p ", static_cast<void*>(frame));
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if (frame) {
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nsAutoString frameName;
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frame->GetFrameName(frameName);
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str += NS_ConvertUTF16toUTF8(frameName).get();
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}
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else {
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str += "\n###!!! NULL out-of-flow frame";
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}
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fprintf_stderr(out, "%s\n", str.get());
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fc = fc->Next();
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}
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}
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const char *
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BreakTypeToString(uint8_t aBreakType)
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{
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switch (aBreakType) {
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case NS_STYLE_CLEAR_NONE: return "nobr";
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case NS_STYLE_CLEAR_LEFT: return "leftbr";
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case NS_STYLE_CLEAR_RIGHT: return "rightbr";
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case NS_STYLE_CLEAR_BOTH: return "leftbr+rightbr";
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case NS_STYLE_CLEAR_LINE: return "linebr";
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default:
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break;
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}
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return "unknown";
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}
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char*
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nsLineBox::StateToString(char* aBuf, int32_t aBufSize) const
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{
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snprintf(aBuf, aBufSize, "%s,%s,%s,%s,%s,before:%s,after:%s[0x%x]",
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IsBlock() ? "block" : "inline",
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IsDirty() ? "dirty" : "clean",
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IsPreviousMarginDirty() ? "prevmargindirty" : "prevmarginclean",
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IsImpactedByFloat() ? "impacted" : "not impacted",
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IsLineWrapped() ? "wrapped" : "not wrapped",
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BreakTypeToString(GetBreakTypeBefore()),
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BreakTypeToString(GetBreakTypeAfter()),
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mAllFlags);
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return aBuf;
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}
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void
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nsLineBox::List(FILE* out, int32_t aIndent, uint32_t aFlags) const
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{
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nsCString str;
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while (aIndent-- > 0) {
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str += " ";
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}
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List(out, str.get(), aFlags);
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}
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void
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nsLineBox::List(FILE* out, const char* aPrefix, uint32_t aFlags) const
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{
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nsCString str(aPrefix);
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char cbuf[100];
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str += nsPrintfCString("line %p: count=%d state=%s ",
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static_cast<const void*>(this), GetChildCount(),
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StateToString(cbuf, sizeof(cbuf)));
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if (IsBlock() && !GetCarriedOutBEndMargin().IsZero()) {
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str += nsPrintfCString("bm=%d ", GetCarriedOutBEndMargin().get());
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}
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nsRect bounds = GetPhysicalBounds();
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str += nsPrintfCString("{%d,%d,%d,%d} ",
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bounds.x, bounds.y, bounds.width, bounds.height);
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if (mWritingMode.IsVertical() || !mWritingMode.IsBidiLTR()) {
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str += nsPrintfCString("{%s: %d,%d,%d,%d; cs=%d,%d} ",
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mWritingMode.DebugString(),
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IStart(), BStart(), ISize(), BSize(),
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mContainerSize.width, mContainerSize.height);
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}
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if (mData &&
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(!mData->mOverflowAreas.VisualOverflow().IsEqualEdges(bounds) ||
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!mData->mOverflowAreas.ScrollableOverflow().IsEqualEdges(bounds))) {
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str += nsPrintfCString("vis-overflow=%d,%d,%d,%d scr-overflow=%d,%d,%d,%d ",
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mData->mOverflowAreas.VisualOverflow().x,
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mData->mOverflowAreas.VisualOverflow().y,
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mData->mOverflowAreas.VisualOverflow().width,
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mData->mOverflowAreas.VisualOverflow().height,
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mData->mOverflowAreas.ScrollableOverflow().x,
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mData->mOverflowAreas.ScrollableOverflow().y,
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mData->mOverflowAreas.ScrollableOverflow().width,
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mData->mOverflowAreas.ScrollableOverflow().height);
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}
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fprintf_stderr(out, "%s<\n", str.get());
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nsIFrame* frame = mFirstChild;
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int32_t n = GetChildCount();
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nsCString pfx(aPrefix);
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pfx += " ";
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while (--n >= 0) {
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frame->List(out, pfx.get(), aFlags);
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frame = frame->GetNextSibling();
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}
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if (HasFloats()) {
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fprintf_stderr(out, "%s> floats <\n", aPrefix);
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ListFloats(out, pfx.get(), mInlineData->mFloats);
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}
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fprintf_stderr(out, "%s>\n", aPrefix);
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}
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#endif
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#ifdef DEBUG
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nsIFrame*
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nsLineBox::LastChild() const
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{
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nsIFrame* frame = mFirstChild;
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int32_t n = GetChildCount() - 1;
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while (--n >= 0) {
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frame = frame->GetNextSibling();
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}
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return frame;
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}
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#endif
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int32_t
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nsLineBox::IndexOf(nsIFrame* aFrame) const
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{
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int32_t i, n = GetChildCount();
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nsIFrame* frame = mFirstChild;
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for (i = 0; i < n; i++) {
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if (frame == aFrame) {
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return i;
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}
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frame = frame->GetNextSibling();
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}
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return -1;
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}
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bool
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nsLineBox::IsEmpty() const
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{
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if (IsBlock())
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return mFirstChild->IsEmpty();
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int32_t n;
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nsIFrame *kid;
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for (n = GetChildCount(), kid = mFirstChild;
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n > 0;
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--n, kid = kid->GetNextSibling())
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{
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if (!kid->IsEmpty())
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return false;
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}
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if (HasBullet()) {
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return false;
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}
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return true;
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}
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bool
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nsLineBox::CachedIsEmpty()
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{
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if (mFlags.mDirty) {
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return IsEmpty();
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}
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if (mFlags.mEmptyCacheValid) {
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return mFlags.mEmptyCacheState;
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}
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bool result;
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if (IsBlock()) {
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result = mFirstChild->CachedIsEmpty();
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} else {
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int32_t n;
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nsIFrame *kid;
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result = true;
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for (n = GetChildCount(), kid = mFirstChild;
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n > 0;
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--n, kid = kid->GetNextSibling())
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{
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if (!kid->CachedIsEmpty()) {
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result = false;
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break;
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}
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}
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if (HasBullet()) {
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result = false;
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}
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}
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mFlags.mEmptyCacheValid = true;
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mFlags.mEmptyCacheState = result;
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return result;
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}
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void
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nsLineBox::DeleteLineList(nsPresContext* aPresContext, nsLineList& aLines,
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nsIFrame* aDestructRoot, nsFrameList* aFrames)
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{
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nsIPresShell* shell = aPresContext->PresShell();
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// Keep our line list and frame list up to date as we
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// remove frames, in case something wants to traverse the
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// frame tree while we're destroying.
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while (!aLines.empty()) {
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nsLineBox* line = aLines.front();
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if (MOZ_UNLIKELY(line->mFlags.mHasHashedFrames)) {
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line->SwitchToCounter(); // Avoid expensive has table removals.
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}
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while (line->GetChildCount() > 0) {
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nsIFrame* child = aFrames->RemoveFirstChild();
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MOZ_ASSERT(child == line->mFirstChild, "Lines out of sync");
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line->mFirstChild = aFrames->FirstChild();
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line->NoteFrameRemoved(child);
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child->DestroyFrom(aDestructRoot);
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}
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aLines.pop_front();
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line->Destroy(shell);
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}
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}
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bool
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nsLineBox::RFindLineContaining(nsIFrame* aFrame,
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const nsLineList::iterator& aBegin,
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nsLineList::iterator& aEnd,
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nsIFrame* aLastFrameBeforeEnd,
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int32_t* aFrameIndexInLine)
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{
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NS_PRECONDITION(aFrame, "null ptr");
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nsIFrame* curFrame = aLastFrameBeforeEnd;
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while (aBegin != aEnd) {
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--aEnd;
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NS_ASSERTION(aEnd->LastChild() == curFrame, "Unexpected curFrame");
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if (MOZ_UNLIKELY(aEnd->mFlags.mHasHashedFrames) &&
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!aEnd->Contains(aFrame)) {
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if (aEnd->mFirstChild) {
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curFrame = aEnd->mFirstChild->GetPrevSibling();
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}
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continue;
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}
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// i is the index of curFrame in aEnd
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int32_t i = aEnd->GetChildCount() - 1;
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while (i >= 0) {
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if (curFrame == aFrame) {
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*aFrameIndexInLine = i;
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return true;
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}
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--i;
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curFrame = curFrame->GetPrevSibling();
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}
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MOZ_ASSERT(!aEnd->mFlags.mHasHashedFrames, "Contains lied to us!");
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}
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*aFrameIndexInLine = -1;
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return false;
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}
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nsCollapsingMargin
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nsLineBox::GetCarriedOutBEndMargin() const
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{
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NS_ASSERTION(IsBlock(),
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"GetCarriedOutBEndMargin called on non-block line.");
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return (IsBlock() && mBlockData)
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? mBlockData->mCarriedOutBEndMargin
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: nsCollapsingMargin();
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}
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bool
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nsLineBox::SetCarriedOutBEndMargin(nsCollapsingMargin aValue)
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{
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bool changed = false;
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if (IsBlock()) {
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if (!aValue.IsZero()) {
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if (!mBlockData) {
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mBlockData = new ExtraBlockData(GetPhysicalBounds());
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}
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changed = aValue != mBlockData->mCarriedOutBEndMargin;
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mBlockData->mCarriedOutBEndMargin = aValue;
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}
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else if (mBlockData) {
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changed = aValue != mBlockData->mCarriedOutBEndMargin;
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mBlockData->mCarriedOutBEndMargin = aValue;
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MaybeFreeData();
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}
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}
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return changed;
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}
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void
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nsLineBox::MaybeFreeData()
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{
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nsRect bounds = GetPhysicalBounds();
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if (mData && mData->mOverflowAreas == nsOverflowAreas(bounds, bounds)) {
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if (IsInline()) {
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if (mInlineData->mFloats.IsEmpty()) {
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delete mInlineData;
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mInlineData = nullptr;
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}
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}
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else if (mBlockData->mCarriedOutBEndMargin.IsZero()) {
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delete mBlockData;
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mBlockData = nullptr;
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}
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}
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}
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// XXX get rid of this???
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nsFloatCache*
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nsLineBox::GetFirstFloat()
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{
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MOZ_ASSERT(IsInline(), "block line can't have floats");
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return mInlineData ? mInlineData->mFloats.Head() : nullptr;
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}
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// XXX this might be too eager to free memory
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void
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nsLineBox::FreeFloats(nsFloatCacheFreeList& aFreeList)
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{
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MOZ_ASSERT(IsInline(), "block line can't have floats");
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if (IsInline() && mInlineData) {
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if (mInlineData->mFloats.NotEmpty()) {
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aFreeList.Append(mInlineData->mFloats);
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}
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|
MaybeFreeData();
|
|
}
|
|
}
|
|
|
|
void
|
|
nsLineBox::AppendFloats(nsFloatCacheFreeList& aFreeList)
|
|
{
|
|
MOZ_ASSERT(IsInline(), "block line can't have floats");
|
|
if (IsInline()) {
|
|
if (aFreeList.NotEmpty()) {
|
|
if (!mInlineData) {
|
|
mInlineData = new ExtraInlineData(GetPhysicalBounds());
|
|
}
|
|
mInlineData->mFloats.Append(aFreeList);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool
|
|
nsLineBox::RemoveFloat(nsIFrame* aFrame)
|
|
{
|
|
MOZ_ASSERT(IsInline(), "block line can't have floats");
|
|
if (IsInline() && mInlineData) {
|
|
nsFloatCache* fc = mInlineData->mFloats.Find(aFrame);
|
|
if (fc) {
|
|
// Note: the placeholder is part of the line's child list
|
|
// and will be removed later.
|
|
mInlineData->mFloats.Remove(fc);
|
|
delete fc;
|
|
MaybeFreeData();
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void
|
|
nsLineBox::SetOverflowAreas(const nsOverflowAreas& aOverflowAreas)
|
|
{
|
|
NS_FOR_FRAME_OVERFLOW_TYPES(otype) {
|
|
NS_ASSERTION(aOverflowAreas.Overflow(otype).width >= 0,
|
|
"illegal width for combined area");
|
|
NS_ASSERTION(aOverflowAreas.Overflow(otype).height >= 0,
|
|
"illegal height for combined area");
|
|
}
|
|
nsRect bounds = GetPhysicalBounds();
|
|
if (!aOverflowAreas.VisualOverflow().IsEqualInterior(bounds) ||
|
|
!aOverflowAreas.ScrollableOverflow().IsEqualEdges(bounds)) {
|
|
if (!mData) {
|
|
if (IsInline()) {
|
|
mInlineData = new ExtraInlineData(bounds);
|
|
}
|
|
else {
|
|
mBlockData = new ExtraBlockData(bounds);
|
|
}
|
|
}
|
|
mData->mOverflowAreas = aOverflowAreas;
|
|
}
|
|
else if (mData) {
|
|
// Store away new value so that MaybeFreeData compares against
|
|
// the right value.
|
|
mData->mOverflowAreas = aOverflowAreas;
|
|
MaybeFreeData();
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
|
|
|
|
static nsLineBox* gDummyLines[1];
|
|
|
|
nsLineIterator::nsLineIterator()
|
|
{
|
|
mLines = gDummyLines;
|
|
mNumLines = 0;
|
|
mIndex = 0;
|
|
mRightToLeft = false;
|
|
}
|
|
|
|
nsLineIterator::~nsLineIterator()
|
|
{
|
|
if (mLines != gDummyLines) {
|
|
delete [] mLines;
|
|
}
|
|
}
|
|
|
|
/* virtual */ void
|
|
nsLineIterator::DisposeLineIterator()
|
|
{
|
|
delete this;
|
|
}
|
|
|
|
nsresult
|
|
nsLineIterator::Init(nsLineList& aLines, bool aRightToLeft)
|
|
{
|
|
mRightToLeft = aRightToLeft;
|
|
|
|
// Count the lines
|
|
int32_t numLines = aLines.size();
|
|
if (0 == numLines) {
|
|
// Use gDummyLines so that we don't need null pointer checks in
|
|
// the accessor methods
|
|
mLines = gDummyLines;
|
|
return NS_OK;
|
|
}
|
|
|
|
// Make a linear array of the lines
|
|
mLines = new nsLineBox*[numLines];
|
|
if (!mLines) {
|
|
// Use gDummyLines so that we don't need null pointer checks in
|
|
// the accessor methods
|
|
mLines = gDummyLines;
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
nsLineBox** lp = mLines;
|
|
for (nsLineList::iterator line = aLines.begin(), line_end = aLines.end() ;
|
|
line != line_end;
|
|
++line)
|
|
{
|
|
*lp++ = line;
|
|
}
|
|
mNumLines = numLines;
|
|
return NS_OK;
|
|
}
|
|
|
|
int32_t
|
|
nsLineIterator::GetNumLines()
|
|
{
|
|
return mNumLines;
|
|
}
|
|
|
|
bool
|
|
nsLineIterator::GetDirection()
|
|
{
|
|
return mRightToLeft;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsLineIterator::GetLine(int32_t aLineNumber,
|
|
nsIFrame** aFirstFrameOnLine,
|
|
int32_t* aNumFramesOnLine,
|
|
nsRect& aLineBounds)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aFirstFrameOnLine);
|
|
NS_ENSURE_ARG_POINTER(aNumFramesOnLine);
|
|
|
|
if ((aLineNumber < 0) || (aLineNumber >= mNumLines)) {
|
|
*aFirstFrameOnLine = nullptr;
|
|
*aNumFramesOnLine = 0;
|
|
aLineBounds.SetRect(0, 0, 0, 0);
|
|
return NS_OK;
|
|
}
|
|
nsLineBox* line = mLines[aLineNumber];
|
|
*aFirstFrameOnLine = line->mFirstChild;
|
|
*aNumFramesOnLine = line->GetChildCount();
|
|
aLineBounds = line->GetPhysicalBounds();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
int32_t
|
|
nsLineIterator::FindLineContaining(nsIFrame* aFrame, int32_t aStartLine)
|
|
{
|
|
NS_PRECONDITION(aStartLine <= mNumLines, "Bogus line numbers");
|
|
int32_t lineNumber = aStartLine;
|
|
while (lineNumber != mNumLines) {
|
|
nsLineBox* line = mLines[lineNumber];
|
|
if (line->Contains(aFrame)) {
|
|
return lineNumber;
|
|
}
|
|
++lineNumber;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsLineIterator::CheckLineOrder(int32_t aLine,
|
|
bool *aIsReordered,
|
|
nsIFrame **aFirstVisual,
|
|
nsIFrame **aLastVisual)
|
|
{
|
|
NS_ASSERTION (aLine >= 0 && aLine < mNumLines, "aLine out of range!");
|
|
nsLineBox* line = mLines[aLine];
|
|
|
|
if (!line->mFirstChild) { // empty line
|
|
*aIsReordered = false;
|
|
*aFirstVisual = nullptr;
|
|
*aLastVisual = nullptr;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsIFrame* leftmostFrame;
|
|
nsIFrame* rightmostFrame;
|
|
*aIsReordered = nsBidiPresUtils::CheckLineOrder(line->mFirstChild, line->GetChildCount(), &leftmostFrame, &rightmostFrame);
|
|
|
|
// map leftmost/rightmost to first/last according to paragraph direction
|
|
*aFirstVisual = mRightToLeft ? rightmostFrame : leftmostFrame;
|
|
*aLastVisual = mRightToLeft ? leftmostFrame : rightmostFrame;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsLineIterator::FindFrameAt(int32_t aLineNumber,
|
|
nsPoint aPos,
|
|
nsIFrame** aFrameFound,
|
|
bool* aPosIsBeforeFirstFrame,
|
|
bool* aPosIsAfterLastFrame)
|
|
{
|
|
NS_PRECONDITION(aFrameFound && aPosIsBeforeFirstFrame && aPosIsAfterLastFrame,
|
|
"null OUT ptr");
|
|
if (!aFrameFound || !aPosIsBeforeFirstFrame || !aPosIsAfterLastFrame) {
|
|
return NS_ERROR_NULL_POINTER;
|
|
}
|
|
if ((aLineNumber < 0) || (aLineNumber >= mNumLines)) {
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
nsLineBox* line = mLines[aLineNumber];
|
|
if (!line) {
|
|
*aFrameFound = nullptr;
|
|
*aPosIsBeforeFirstFrame = true;
|
|
*aPosIsAfterLastFrame = false;
|
|
return NS_OK;
|
|
}
|
|
|
|
if (line->ISize() == 0 && line->BSize() == 0)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
nsIFrame* frame = line->mFirstChild;
|
|
nsIFrame* closestFromStart = nullptr;
|
|
nsIFrame* closestFromEnd = nullptr;
|
|
|
|
WritingMode wm = line->mWritingMode;
|
|
nsSize containerSize = line->mContainerSize;
|
|
|
|
LogicalPoint pos(wm, aPos, containerSize);
|
|
|
|
int32_t n = line->GetChildCount();
|
|
while (n--) {
|
|
LogicalRect rect = frame->GetLogicalRect(wm, containerSize);
|
|
if (rect.ISize(wm) > 0) {
|
|
// If pos.I() is inside this frame - this is it
|
|
if (rect.IStart(wm) <= pos.I(wm) && rect.IEnd(wm) > pos.I(wm)) {
|
|
closestFromStart = closestFromEnd = frame;
|
|
break;
|
|
}
|
|
if (rect.IStart(wm) < pos.I(wm)) {
|
|
if (!closestFromStart ||
|
|
rect.IEnd(wm) > closestFromStart->
|
|
GetLogicalRect(wm, containerSize).IEnd(wm))
|
|
closestFromStart = frame;
|
|
}
|
|
else {
|
|
if (!closestFromEnd ||
|
|
rect.IStart(wm) < closestFromEnd->
|
|
GetLogicalRect(wm, containerSize).IStart(wm))
|
|
closestFromEnd = frame;
|
|
}
|
|
}
|
|
frame = frame->GetNextSibling();
|
|
}
|
|
if (!closestFromStart && !closestFromEnd) {
|
|
// All frames were zero-width. Just take the first one.
|
|
closestFromStart = closestFromEnd = line->mFirstChild;
|
|
}
|
|
*aPosIsBeforeFirstFrame = mRightToLeft ? !closestFromEnd : !closestFromStart;
|
|
*aPosIsAfterLastFrame = mRightToLeft ? !closestFromStart : !closestFromEnd;
|
|
if (closestFromStart == closestFromEnd) {
|
|
*aFrameFound = closestFromStart;
|
|
}
|
|
else if (!closestFromStart) {
|
|
*aFrameFound = closestFromEnd;
|
|
}
|
|
else if (!closestFromEnd) {
|
|
*aFrameFound = closestFromStart;
|
|
}
|
|
else { // we're between two frames
|
|
nscoord delta =
|
|
closestFromEnd->GetLogicalRect(wm, containerSize).IStart(wm) -
|
|
closestFromStart->GetLogicalRect(wm, containerSize).IEnd(wm);
|
|
if (pos.I(wm) < closestFromStart->
|
|
GetLogicalRect(wm, containerSize).IEnd(wm) + delta/2) {
|
|
*aFrameFound = closestFromStart;
|
|
} else {
|
|
*aFrameFound = closestFromEnd;
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsLineIterator::GetNextSiblingOnLine(nsIFrame*& aFrame, int32_t aLineNumber)
|
|
{
|
|
aFrame = aFrame->GetNextSibling();
|
|
return NS_OK;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
nsFloatCacheList::nsFloatCacheList() :
|
|
mHead(nullptr)
|
|
{
|
|
MOZ_COUNT_CTOR(nsFloatCacheList);
|
|
}
|
|
#endif
|
|
|
|
nsFloatCacheList::~nsFloatCacheList()
|
|
{
|
|
DeleteAll();
|
|
MOZ_COUNT_DTOR(nsFloatCacheList);
|
|
}
|
|
|
|
void
|
|
nsFloatCacheList::DeleteAll()
|
|
{
|
|
nsFloatCache* c = mHead;
|
|
while (c) {
|
|
nsFloatCache* next = c->Next();
|
|
delete c;
|
|
c = next;
|
|
}
|
|
mHead = nullptr;
|
|
}
|
|
|
|
nsFloatCache*
|
|
nsFloatCacheList::Tail() const
|
|
{
|
|
nsFloatCache* fc = mHead;
|
|
while (fc) {
|
|
if (!fc->mNext) {
|
|
break;
|
|
}
|
|
fc = fc->mNext;
|
|
}
|
|
return fc;
|
|
}
|
|
|
|
void
|
|
nsFloatCacheList::Append(nsFloatCacheFreeList& aList)
|
|
{
|
|
NS_PRECONDITION(aList.NotEmpty(), "Appending empty list will fail");
|
|
|
|
nsFloatCache* tail = Tail();
|
|
if (tail) {
|
|
NS_ASSERTION(!tail->mNext, "Bogus!");
|
|
tail->mNext = aList.mHead;
|
|
}
|
|
else {
|
|
NS_ASSERTION(!mHead, "Bogus!");
|
|
mHead = aList.mHead;
|
|
}
|
|
aList.mHead = nullptr;
|
|
aList.mTail = nullptr;
|
|
}
|
|
|
|
nsFloatCache*
|
|
nsFloatCacheList::Find(nsIFrame* aOutOfFlowFrame)
|
|
{
|
|
nsFloatCache* fc = mHead;
|
|
while (fc) {
|
|
if (fc->mFloat == aOutOfFlowFrame) {
|
|
break;
|
|
}
|
|
fc = fc->Next();
|
|
}
|
|
return fc;
|
|
}
|
|
|
|
nsFloatCache*
|
|
nsFloatCacheList::RemoveAndReturnPrev(nsFloatCache* aElement)
|
|
{
|
|
nsFloatCache* fc = mHead;
|
|
nsFloatCache* prev = nullptr;
|
|
while (fc) {
|
|
if (fc == aElement) {
|
|
if (prev) {
|
|
prev->mNext = fc->mNext;
|
|
} else {
|
|
mHead = fc->mNext;
|
|
}
|
|
return prev;
|
|
}
|
|
prev = fc;
|
|
fc = fc->mNext;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
nsFloatCacheFreeList::nsFloatCacheFreeList() :
|
|
mTail(nullptr)
|
|
{
|
|
MOZ_COUNT_CTOR(nsFloatCacheFreeList);
|
|
}
|
|
|
|
nsFloatCacheFreeList::~nsFloatCacheFreeList()
|
|
{
|
|
MOZ_COUNT_DTOR(nsFloatCacheFreeList);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
nsFloatCacheFreeList::Append(nsFloatCacheList& aList)
|
|
{
|
|
NS_PRECONDITION(aList.NotEmpty(), "Appending empty list will fail");
|
|
|
|
if (mTail) {
|
|
NS_ASSERTION(!mTail->mNext, "Bogus");
|
|
mTail->mNext = aList.mHead;
|
|
}
|
|
else {
|
|
NS_ASSERTION(!mHead, "Bogus");
|
|
mHead = aList.mHead;
|
|
}
|
|
mTail = aList.Tail();
|
|
aList.mHead = nullptr;
|
|
}
|
|
|
|
void
|
|
nsFloatCacheFreeList::Remove(nsFloatCache* aElement)
|
|
{
|
|
nsFloatCache* prev = nsFloatCacheList::RemoveAndReturnPrev(aElement);
|
|
if (mTail == aElement) {
|
|
mTail = prev;
|
|
}
|
|
}
|
|
|
|
void
|
|
nsFloatCacheFreeList::DeleteAll()
|
|
{
|
|
nsFloatCacheList::DeleteAll();
|
|
mTail = nullptr;
|
|
}
|
|
|
|
nsFloatCache*
|
|
nsFloatCacheFreeList::Alloc(nsIFrame* aFloat)
|
|
{
|
|
NS_PRECONDITION(aFloat->GetStateBits() & NS_FRAME_OUT_OF_FLOW,
|
|
"This is a float cache, why isn't the frame out-of-flow?");
|
|
nsFloatCache* fc = mHead;
|
|
if (mHead) {
|
|
if (mHead == mTail) {
|
|
mHead = mTail = nullptr;
|
|
}
|
|
else {
|
|
mHead = fc->mNext;
|
|
}
|
|
fc->mNext = nullptr;
|
|
}
|
|
else {
|
|
fc = new nsFloatCache();
|
|
}
|
|
fc->mFloat = aFloat;
|
|
return fc;
|
|
}
|
|
|
|
void
|
|
nsFloatCacheFreeList::Append(nsFloatCache* aFloat)
|
|
{
|
|
NS_ASSERTION(!aFloat->mNext, "Bogus!");
|
|
aFloat->mNext = nullptr;
|
|
if (mTail) {
|
|
NS_ASSERTION(!mTail->mNext, "Bogus!");
|
|
mTail->mNext = aFloat;
|
|
mTail = aFloat;
|
|
}
|
|
else {
|
|
NS_ASSERTION(!mHead, "Bogus!");
|
|
mHead = mTail = aFloat;
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
|
|
nsFloatCache::nsFloatCache()
|
|
: mFloat(nullptr),
|
|
mNext(nullptr)
|
|
{
|
|
MOZ_COUNT_CTOR(nsFloatCache);
|
|
}
|
|
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
nsFloatCache::~nsFloatCache()
|
|
{
|
|
MOZ_COUNT_DTOR(nsFloatCache);
|
|
}
|
|
#endif
|