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nsBidiPresUtils.cpp
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nsBidiPresUtils.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Uri Bernstein <uriber@gmail.com>
* Haamed Gheibi <gheibi@metanetworking.com>
* Ehsan Akhgari <ehsan.akhgari@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifdef IBMBIDI
#include "nsBidiPresUtils.h"
#include "nsTextFragment.h"
#include "nsGkAtoms.h"
#include "nsPresContext.h"
#include "nsRenderingContext.h"
#include "nsIServiceManager.h"
#include "nsFrameManager.h"
#include "nsBidiFrames.h"
#include "nsBidiUtils.h"
#include "nsCSSFrameConstructor.h"
#include "nsHTMLContainerFrame.h"
#include "nsInlineFrame.h"
#include "nsPlaceholderFrame.h"
#include "nsContainerFrame.h"
#include "nsFirstLetterFrame.h"
#include "gfxUnicodeProperties.h"
#undef NOISY_BIDI
#undef REALLY_NOISY_BIDI
using namespace mozilla;
static const PRUnichar kSpace = 0x0020;
static const PRUnichar kLineSeparator = 0x2028;
static const PRUnichar kObjectSubstitute = 0xFFFC;
static const PRUnichar kLRE = 0x202A;
static const PRUnichar kRLE = 0x202B;
static const PRUnichar kLRO = 0x202D;
static const PRUnichar kRLO = 0x202E;
static const PRUnichar kPDF = 0x202C;
static const PRUnichar ALEF = 0x05D0;
#define CHAR_IS_HEBREW(c) ((0x0590 <= (c)) && ((c)<= 0x05FF))
// Note: The above code are moved from gfx/src/windows/nsRenderingContextWin.cpp
nsIFrame*
NS_NewDirectionalFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, PRUnichar aChar);
nsBidiPresUtils::nsBidiPresUtils() : mArraySize(8),
mIndexMap(nsnull),
mLevels(nsnull),
mSuccess(NS_ERROR_FAILURE),
mBidiEngine(nsnull)
{
mBidiEngine = new nsBidi();
if (mBidiEngine && mContentToFrameIndex.Init()) {
mSuccess = NS_OK;
}
}
nsBidiPresUtils::~nsBidiPresUtils()
{
if (mLevels) {
delete[] mLevels;
}
if (mIndexMap) {
delete[] mIndexMap;
}
delete mBidiEngine;
}
PRBool
nsBidiPresUtils::IsSuccessful() const
{
return NS_SUCCEEDED(mSuccess);
}
/* Some helper methods for Resolve() */
// Should this frame be split between text runs?
PRBool
IsBidiSplittable(nsIFrame* aFrame) {
nsIAtom* frameType = aFrame->GetType();
// Bidi inline containers should be split, unless they're line frames.
return aFrame->IsFrameOfType(nsIFrame::eBidiInlineContainer)
&& frameType != nsGkAtoms::lineFrame;
}
static nsresult
SplitInlineAncestors(nsIFrame* aFrame)
{
nsPresContext *presContext = aFrame->PresContext();
nsIPresShell *presShell = presContext->PresShell();
nsIFrame* frame = aFrame;
nsIFrame* parent = aFrame->GetParent();
nsIFrame* newParent;
while (IsBidiSplittable(parent)) {
nsIFrame* grandparent = parent->GetParent();
NS_ASSERTION(grandparent, "Couldn't get parent's parent in nsBidiPresUtils::SplitInlineAncestors");
nsresult rv = presShell->FrameConstructor()->
CreateContinuingFrame(presContext, parent, grandparent, &newParent, PR_FALSE);
if (NS_FAILED(rv)) {
return rv;
}
// Split the child list after |frame|.
nsContainerFrame* container = do_QueryFrame(parent);
nsFrameList tail = container->StealFramesAfter(frame);
// Reparent views as necessary
rv = nsContainerFrame::ReparentFrameViewList(presContext, tail, parent, newParent);
if (NS_FAILED(rv)) {
return rv;
}
// The parent's continuation adopts the siblings after the split.
rv = newParent->InsertFrames(nsGkAtoms::nextBidi, nsnull, tail);
if (NS_FAILED(rv)) {
return rv;
}
// The list name nsGkAtoms::nextBidi would indicate we don't want reflow
nsFrameList temp(newParent, newParent);
rv = grandparent->InsertFrames(nsGkAtoms::nextBidi, parent, temp);
if (NS_FAILED(rv)) {
return rv;
}
frame = parent;
parent = grandparent;
}
return NS_OK;
}
// Convert bidi continuations to fluid continuations for a frame and all of its
// inline ancestors.
static void
JoinInlineAncestors(nsIFrame* aFrame)
{
nsIFrame* frame = aFrame;
while (frame && IsBidiSplittable(frame)) {
nsIFrame* next = frame->GetNextContinuation();
if (next) {
NS_ASSERTION (!frame->GetNextInFlow() || frame->GetNextInFlow() == next,
"next-in-flow is not next continuation!");
frame->SetNextInFlow(next);
NS_ASSERTION (!next->GetPrevInFlow() || next->GetPrevInFlow() == frame,
"prev-in-flow is not prev continuation!");
next->SetPrevInFlow(frame);
}
// Join the parent only as long as we're its last child.
if (frame->GetNextSibling())
break;
frame = frame->GetParent();
}
}
static nsresult
CreateBidiContinuation(nsIFrame* aFrame,
nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
NS_PRECONDITION(aFrame, "null ptr");
*aNewFrame = nsnull;
nsPresContext *presContext = aFrame->PresContext();
nsIPresShell *presShell = presContext->PresShell();
NS_ASSERTION(presShell, "PresShell must be set on PresContext before calling nsBidiPresUtils::CreateBidiContinuation");
nsIFrame* parent = aFrame->GetParent();
NS_ASSERTION(parent, "Couldn't get frame parent in nsBidiPresUtils::CreateBidiContinuation");
nsresult rv = NS_OK;
// Have to special case floating first letter frames because the continuation
// doesn't go in the first letter frame. The continuation goes with the rest
// of the text that the first letter frame was made out of.
if (parent->GetType() == nsGkAtoms::letterFrame &&
parent->GetStyleDisplay()->IsFloating()) {
nsFirstLetterFrame* letterFrame = do_QueryFrame(parent);
rv = letterFrame->CreateContinuationForFloatingParent(presContext, aFrame,
aNewFrame, PR_FALSE);
return rv;
}
rv = presShell->FrameConstructor()->
CreateContinuingFrame(presContext, aFrame, parent, aNewFrame, PR_FALSE);
if (NS_FAILED(rv)) {
return rv;
}
// The list name nsGkAtoms::nextBidi would indicate we don't want reflow
// XXXbz this needs higher-level framelist love
nsFrameList temp(*aNewFrame, *aNewFrame);
rv = parent->InsertFrames(nsGkAtoms::nextBidi, aFrame, temp);
if (NS_FAILED(rv)) {
return rv;
}
// Split inline ancestor frames
rv = SplitInlineAncestors(aFrame);
if (NS_FAILED(rv)) {
return rv;
}
return NS_OK;
}
static PRBool
IsFrameInCurrentLine(nsBlockInFlowLineIterator* aLineIter,
nsIFrame* aPrevFrame, nsIFrame* aFrame)
{
nsIFrame* endFrame = aLineIter->IsLastLineInList() ? nsnull :
aLineIter->GetLine().next()->mFirstChild;
nsIFrame* startFrame = aPrevFrame ? aPrevFrame : aLineIter->GetLine()->mFirstChild;
for (nsIFrame* frame = startFrame; frame && frame != endFrame;
frame = frame->GetNextSibling()) {
if (frame == aFrame)
return PR_TRUE;
}
return PR_FALSE;
}
static void
AdvanceLineIteratorToFrame(nsIFrame* aFrame,
nsBlockInFlowLineIterator* aLineIter,
nsIFrame*& aPrevFrame)
{
// Advance aLine to the line containing aFrame
nsIFrame* child = aFrame;
nsFrameManager* frameManager = aFrame->PresContext()->FrameManager();
nsIFrame* parent = nsLayoutUtils::GetParentOrPlaceholderFor(frameManager, child);
while (parent && !nsLayoutUtils::GetAsBlock(parent)) {
child = parent;
parent = nsLayoutUtils::GetParentOrPlaceholderFor(frameManager, child);
}
NS_ASSERTION (parent, "aFrame is not a descendent of aBlockFrame");
while (!IsFrameInCurrentLine(aLineIter, aPrevFrame, child)) {
#ifdef DEBUG
PRBool hasNext =
#endif
aLineIter->Next();
NS_ASSERTION(hasNext, "Can't find frame in lines!");
aPrevFrame = nsnull;
}
aPrevFrame = child;
}
/*
* Overview of the implementation of Resolve():
*
* Walk through the descendants of aBlockFrame and build:
* * mLogicalFrames: an nsTArray of nsIFrame* pointers in logical order
* * mBuffer: an nsAutoString containing a representation of
* the content of the frames.
* In the case of text frames, this is the actual text context of the
* frames, but some other elements are represented in a symbolic form which
* will make the Unicode Bidi Algorithm give the correct results.
* Bidi embeddings and overrides set by CSS or <bdo> elements are
* represented by the corresponding Unicode control characters.
* <br> elements are represented by U+2028 LINE SEPARATOR
* Other inline elements are represented by U+FFFC OBJECT REPLACEMENT
* CHARACTER
*
* Then pass mBuffer to the Bidi engine for resolving of embedding levels
* by nsBidi::SetPara() and division into directional runs by
* nsBidi::CountRuns().
*
* Finally, walk these runs in logical order using nsBidi::GetLogicalRun() and
* correlate them with the frames indexed in mLogicalFrames, setting the
* baseLevel and embeddingLevel properties according to the results returned
* by the Bidi engine.
*
* The rendering layer requires each text frame to contain text in only one
* direction, so we may need to call EnsureBidiContinuation() to split frames.
* We may also need to call RemoveBidiContinuation() to convert frames created
* by EnsureBidiContinuation() in previous reflows into fluid continuations.
*/
nsresult
nsBidiPresUtils::Resolve(nsBlockFrame* aBlockFrame)
{
mLogicalFrames.Clear();
mContentToFrameIndex.Clear();
nsPresContext *presContext = aBlockFrame->PresContext();
nsIPresShell* shell = presContext->PresShell();
nsStyleContext* styleContext = aBlockFrame->GetStyleContext();
// handle bidi-override being set on the block itself before calling
// InitLogicalArray.
const nsStyleVisibility* vis = aBlockFrame->GetStyleVisibility();
const nsStyleTextReset* text = aBlockFrame->GetStyleTextReset();
if (text->mUnicodeBidi == NS_STYLE_UNICODE_BIDI_OVERRIDE) {
nsIFrame *directionalFrame = nsnull;
if (NS_STYLE_DIRECTION_RTL == vis->mDirection) {
directionalFrame = NS_NewDirectionalFrame(shell, styleContext, kRLO);
}
else if (NS_STYLE_DIRECTION_LTR == vis->mDirection) {
directionalFrame = NS_NewDirectionalFrame(shell, styleContext, kLRO);
}
if (directionalFrame) {
mLogicalFrames.AppendElement(directionalFrame);
}
}
for (nsBlockFrame* block = aBlockFrame; block;
block = static_cast<nsBlockFrame*>(block->GetNextContinuation())) {
block->RemoveStateBits(NS_BLOCK_NEEDS_BIDI_RESOLUTION);
InitLogicalArray(block->GetFirstChild(nsnull));
}
if (text->mUnicodeBidi == NS_STYLE_UNICODE_BIDI_OVERRIDE) {
nsIFrame* directionalFrame = NS_NewDirectionalFrame(shell, styleContext, kPDF);
if (directionalFrame) {
mLogicalFrames.AppendElement(directionalFrame);
}
}
CreateBlockBuffer();
PRInt32 bufferLength = mBuffer.Length();
if (bufferLength < 1) {
mSuccess = NS_OK;
return mSuccess;
}
PRInt32 runCount;
PRUint8 embeddingLevel;
nsBidiLevel paraLevel = embeddingLevel =
(NS_STYLE_DIRECTION_RTL == vis->mDirection)
? NSBIDI_RTL : NSBIDI_LTR;
mSuccess = mBidiEngine->SetPara(mBuffer.get(), bufferLength, paraLevel, nsnull);
if (NS_FAILED(mSuccess) ) {
return mSuccess;
}
mSuccess = mBidiEngine->CountRuns(&runCount);
if (NS_FAILED(mSuccess) ) {
return mSuccess;
}
PRInt32 runLength = 0; // the length of the current run of text
PRInt32 lineOffset = 0; // the start of the current run
PRInt32 logicalLimit = 0; // the end of the current run + 1
PRInt32 numRun = -1;
PRInt32 fragmentLength = 0; // the length of the current text frame
PRInt32 frameIndex = -1; // index to the frames in mLogicalFrames
PRInt32 frameCount = mLogicalFrames.Length();
PRInt32 contentOffset = 0; // offset of current frame in its content node
PRBool isTextFrame = PR_FALSE;
nsIFrame* frame = nsnull;
nsIContent* content = nsnull;
PRInt32 contentTextLength;
nsIAtom* frameType = nsnull;
FramePropertyTable *propTable = presContext->PropertyTable();
nsBlockInFlowLineIterator lineIter(aBlockFrame, aBlockFrame->begin_lines(), PR_FALSE);
if (lineIter.GetLine() == aBlockFrame->end_lines()) {
// Advance to first valid line (might be in a next-continuation)
lineIter.Next();
}
nsIFrame* prevFrame = nsnull;
PRBool lineNeedsUpdate = PR_FALSE;
PRBool isVisual = presContext->IsVisualMode();
if (isVisual) {
/**
* Drill up in content to detect whether this is an element that needs to be
* rendered with logical order even on visual pages.
*
* We always use logical order on form controls, firstly so that text entry
* will be in logical order, but also because visual pages were written with
* the assumption that even if the browser had no support for right-to-left
* text rendering, it would use native widgets with bidi support to display
* form controls.
*
* We also use logical order in XUL elements, since we expect that if a XUL
* element appears in a visual page, it will be generated by an XBL binding
* and contain localized text which will be in logical order.
*/
for (content = aBlockFrame->GetContent() ; content; content = content->GetParent()) {
if (content->IsNodeOfType(nsINode::eHTML_FORM_CONTROL) || content->IsXUL()) {
isVisual = PR_FALSE;
break;
}
}
}
#ifdef DEBUG
#ifdef NOISY_BIDI
printf("Before Resolve(), aBlockFrame=0x%p, mBuffer='%s', frameCount=%d\n",
(void*)aBlockFrame, NS_ConvertUTF16toUTF8(mBuffer).get(), frameCount);
#ifdef REALLY_NOISY_BIDI
printf(" block frame tree=:\n");
aBlockFrame->List(stdout, 0);
#endif
#endif
#endif
for (; ;) {
if (fragmentLength <= 0) {
// Get the next frame from mLogicalFrames
if (++frameIndex >= frameCount) {
break;
}
frame = mLogicalFrames[frameIndex];
frameType = frame->GetType();
lineNeedsUpdate = PR_TRUE;
if (nsGkAtoms::textFrame == frameType) {
content = frame->GetContent();
if (!content) {
mSuccess = NS_OK;
break;
}
contentTextLength = content->TextLength();
if (contentTextLength == 0) {
frame->AdjustOffsetsForBidi(0, 0);
// Set the base level and embedding level of the current run even
// on an empty frame. Otherwise frame reordering will not be correct.
propTable->Set(frame, nsIFrame::EmbeddingLevelProperty(),
NS_INT32_TO_PTR(embeddingLevel));
propTable->Set(frame, nsIFrame::BaseLevelProperty(),
NS_INT32_TO_PTR(paraLevel));
continue;
}
PRInt32 start, end;
frame->GetOffsets(start, end);
NS_ASSERTION(!(contentTextLength < end - start),
"Frame offsets don't fit in content");
fragmentLength = NS_MIN(contentTextLength, end - start);
contentOffset = start;
isTextFrame = PR_TRUE;
}
else {
/*
* Any non-text frame corresponds to a single character in the text buffer
* (a bidi control character, LINE SEPARATOR, or OBJECT SUBSTITUTE)
*/
isTextFrame = PR_FALSE;
fragmentLength = 1;
}
} // if (fragmentLength <= 0)
if (runLength <= 0) {
// Get the next run of text from the Bidi engine
if (++numRun >= runCount) {
break;
}
lineOffset = logicalLimit;
if (NS_FAILED(mBidiEngine->GetLogicalRun(
lineOffset, &logicalLimit, &embeddingLevel) ) ) {
break;
}
runLength = logicalLimit - lineOffset;
if (isVisual) {
embeddingLevel = paraLevel;
}
} // if (runLength <= 0)
if (nsGkAtoms::directionalFrame == frameType) {
frame->Destroy();
frame = nsnull;
++lineOffset;
}
else {
propTable->Set(frame, nsIFrame::EmbeddingLevelProperty(),
NS_INT32_TO_PTR(embeddingLevel));
propTable->Set(frame, nsIFrame::BaseLevelProperty(),
NS_INT32_TO_PTR(paraLevel));
if (isTextFrame) {
if ( (runLength > 0) && (runLength < fragmentLength) ) {
/*
* The text in this frame continues beyond the end of this directional run.
* Create a non-fluid continuation frame for the next directional run.
*/
if (lineNeedsUpdate) {
AdvanceLineIteratorToFrame(frame, &lineIter, prevFrame);
lineNeedsUpdate = PR_FALSE;
}
lineIter.GetLine()->MarkDirty();
nsIFrame* nextBidi;
PRInt32 runEnd = contentOffset + runLength;
EnsureBidiContinuation(frame, &nextBidi, frameIndex,
contentOffset,
runEnd);
if (NS_FAILED(mSuccess)) {
break;
}
nextBidi->AdjustOffsetsForBidi(runEnd,
contentOffset + fragmentLength);
frame = nextBidi;
contentOffset = runEnd;
} // if (runLength < fragmentLength)
else {
if (contentOffset + fragmentLength == contentTextLength) {
/*
* We have finished all the text in this content node. Convert any
* further non-fluid continuations to fluid continuations and advance
* frameIndex to the last frame in the content node
*/
PRInt32 newIndex = 0;
mContentToFrameIndex.Get(content, &newIndex);
if (newIndex > frameIndex) {
RemoveBidiContinuation(frame, frameIndex, newIndex, lineOffset);
frameIndex = newIndex;
}
} else if (fragmentLength > 0 && runLength > fragmentLength) {
/*
* There is more text that belongs to this directional run in the next
* text frame: make sure it is a fluid continuation of the current frame.
* Do not advance frameIndex, because the next frame may contain
* multi-directional text and need to be split
*/
PRInt32 newIndex = frameIndex;
do {
} while (mLogicalFrames[++newIndex]->GetType() == nsGkAtoms::directionalFrame);
RemoveBidiContinuation(frame, frameIndex, newIndex, lineOffset);
} else if (runLength == fragmentLength) {
/*
* The directional run ends at the end of the frame. Make sure that
* the next frame is a non-fluid continuation
*/
nsIFrame* next = frame->GetNextInFlow();
if (next) {
frame->SetNextContinuation(next);
next->SetPrevContinuation(frame);
}
}
frame->AdjustOffsetsForBidi(contentOffset, contentOffset + fragmentLength);
if (lineNeedsUpdate) {
AdvanceLineIteratorToFrame(frame, &lineIter, prevFrame);
lineNeedsUpdate = PR_FALSE;
}
lineIter.GetLine()->MarkDirty();
}
} // isTextFrame
else {
++lineOffset;
}
} // not directionalFrame
PRInt32 temp = runLength;
runLength -= fragmentLength;
fragmentLength -= temp;
if (frame && fragmentLength <= 0) {
// If the frame is at the end of a run, split all ancestor inlines that
// need splitting.
// To determine whether we're at the end of the run, we check that we've
// finished processing the current run, and that the current frame
// doesn't have a fluid continuation (it could have a fluid continuation
// of zero length, so testing runLength alone is not sufficient).
if (runLength <= 0 && !frame->GetNextInFlow()) {
nsIFrame* child = frame;
nsIFrame* parent = frame->GetParent();
// As long as we're on the last sibling, the parent doesn't have to be split.
// However, if the parent has a fluid continuation, we do have to make
// it non-fluid. This can happen e.g. when we have a first-letter frame
// and the end of the first-letter coincides with the end of a
// directional run.
while (parent &&
IsBidiSplittable(parent) &&
!child->GetNextSibling()) {
nsIFrame* next = parent->GetNextInFlow();
if (next) {
parent->SetNextContinuation(next);
next->SetPrevContinuation(parent);
}
child = parent;
parent = child->GetParent();
}
if (parent && IsBidiSplittable(parent))
SplitInlineAncestors(child);
}
else if (!frame->GetNextSibling()) {
// We're not at an end of a run, and |frame| is the last child of its parent.
// If its ancestors happen to have bidi continuations, convert them into
// fluid continuations.
nsIFrame* parent = frame->GetParent();
JoinInlineAncestors(parent);
}
}
} // for
#ifdef DEBUG
#ifdef REALLY_NOISY_BIDI
printf("---\nAfter Resolve(), frameTree =:\n");
aBlockFrame->List(stdout, 0);
printf("===\n");
#endif
#endif
return mSuccess;
}
// Should this frame be treated as a leaf (e.g. when building mLogicalFrames)?
PRBool IsBidiLeaf(nsIFrame* aFrame) {
nsIFrame* kid = aFrame->GetFirstChild(nsnull);
return !kid
|| !aFrame->IsFrameOfType(nsIFrame::eBidiInlineContainer);
}
void
nsBidiPresUtils::InitLogicalArray(nsIFrame* aCurrentFrame)
{
if (!aCurrentFrame)
return;
nsIPresShell* shell = aCurrentFrame->PresContext()->PresShell();
nsStyleContext* styleContext;
for (nsIFrame* childFrame = aCurrentFrame; childFrame;
childFrame = childFrame->GetNextSibling()) {
// If the real frame for a placeholder is a first letter frame, we need to
// drill down into it and include its contents in Bidi resolution.
// If not, we just use the placeholder.
nsIFrame* frame = childFrame;
if (nsGkAtoms::placeholderFrame == childFrame->GetType()) {
nsIFrame* realFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(childFrame);
if (realFrame->GetType() == nsGkAtoms::letterFrame) {
frame = realFrame;
}
}
PRUnichar ch = 0;
if (frame->IsFrameOfType(nsIFrame::eBidiInlineContainer)) {
const nsStyleVisibility* vis = frame->GetStyleVisibility();
const nsStyleTextReset* text = frame->GetStyleTextReset();
switch (text->mUnicodeBidi) {
case NS_STYLE_UNICODE_BIDI_NORMAL:
break;
case NS_STYLE_UNICODE_BIDI_EMBED:
styleContext = frame->GetStyleContext();
if (NS_STYLE_DIRECTION_RTL == vis->mDirection) {
ch = kRLE;
}
else if (NS_STYLE_DIRECTION_LTR == vis->mDirection) {
ch = kLRE;
}
break;
case NS_STYLE_UNICODE_BIDI_OVERRIDE:
styleContext = frame->GetStyleContext();
if (NS_STYLE_DIRECTION_RTL == vis->mDirection) {
ch = kRLO;
}
else if (NS_STYLE_DIRECTION_LTR == vis->mDirection) {
ch = kLRO;
}
break;
}
// Create a directional frame before the first frame of an
// element specifying embedding or override
if (ch != 0 && !frame->GetPrevContinuation()) {
nsIFrame* dirFrame = NS_NewDirectionalFrame(shell, styleContext, ch);
if (dirFrame) {
mLogicalFrames.AppendElement(dirFrame);
}
}
}
if (IsBidiLeaf(frame)) {
/* Bidi leaf frame: add the frame to the mLogicalFrames array,
* and add its index to the mContentToFrameIndex hashtable. This
* will be used in RemoveBidiContinuation() to identify the last
* frame in the array with a given content.
*/
nsIContent* content = frame->GetContent();
if (content) {
mContentToFrameIndex.Put(content, mLogicalFrames.Length());
}
mLogicalFrames.AppendElement(frame);
}
else {
nsIFrame* kid = frame->GetFirstChild(nsnull);
InitLogicalArray(kid);
}
// If the element is attributed by dir, indicate direction pop (add PDF frame)
if (ch != 0 && !frame->GetNextContinuation()) {
// Create a directional frame after the last frame of an
// element specifying embedding or override
nsIFrame* dirFrame = NS_NewDirectionalFrame(shell, styleContext, kPDF);
if (dirFrame) {
mLogicalFrames.AppendElement(dirFrame);
}
}
} // for
}
void
nsBidiPresUtils::CreateBlockBuffer()
{
mBuffer.SetLength(0);
nsIFrame* frame;
nsIContent* prevContent = nsnull;
PRUint32 i;
PRUint32 count = mLogicalFrames.Length();
for (i = 0; i < count; i++) {
frame = mLogicalFrames[i];
nsIAtom* frameType = frame->GetType();
if (nsGkAtoms::textFrame == frameType) {
nsIContent* content = frame->GetContent();
if (!content) {
mSuccess = NS_OK;
break;
}
if (content == prevContent) {
continue;
}
prevContent = content;
content->AppendTextTo(mBuffer);
}
else if (nsGkAtoms::brFrame == frameType) { // break frame
// Append line separator
mBuffer.Append(kLineSeparator);
}
else if (nsGkAtoms::directionalFrame == frameType) {
nsDirectionalFrame* dirFrame = static_cast<nsDirectionalFrame*>(frame);
mBuffer.Append(dirFrame->GetChar());
}
else { // not text frame
// See the Unicode Bidi Algorithm:
// "...inline objects (such as graphics) are treated as if they are ... U+FFFC"
mBuffer.Append(kObjectSubstitute);
}
}
// XXX: TODO: Handle preformatted text ('\n')
mBuffer.ReplaceChar("\t\r\n", kSpace);
}
void
nsBidiPresUtils::ReorderFrames(nsIFrame* aFirstFrameOnLine,
PRInt32 aNumFramesOnLine)
{
// If this line consists of a line frame, reorder the line frame's children.
if (aFirstFrameOnLine->GetType() == nsGkAtoms::lineFrame) {
aFirstFrameOnLine = aFirstFrameOnLine->GetFirstChild(nsnull);
if (!aFirstFrameOnLine)
return;
// All children of the line frame are on the first line. Setting aNumFramesOnLine
// to -1 makes InitLogicalArrayFromLine look at all of them.
aNumFramesOnLine = -1;
}
InitLogicalArrayFromLine(aFirstFrameOnLine, aNumFramesOnLine);
PRBool isReordered;
PRBool hasRTLFrames;
Reorder(isReordered, hasRTLFrames);
RepositionInlineFrames(aFirstFrameOnLine);
}
nsresult
nsBidiPresUtils::Reorder(PRBool& aReordered, PRBool& aHasRTLFrames)
{
aReordered = PR_FALSE;
aHasRTLFrames = PR_FALSE;
PRInt32 count = mLogicalFrames.Length();
if (mArraySize < count) {
mArraySize = count << 1;
if (mLevels) {
delete[] mLevels;
mLevels = nsnull;
}
if (mIndexMap) {
delete[] mIndexMap;
mIndexMap = nsnull;
}
}
if (!mLevels) {
mLevels = new PRUint8[mArraySize];
if (!mLevels) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
memset(mLevels, 0, sizeof(PRUint8) * mArraySize);
nsIFrame* frame;
PRInt32 i;
for (i = 0; i < count; i++) {
frame = mLogicalFrames[i];
mLevels[i] = GetFrameEmbeddingLevel(frame);
if (mLevels[i] & 1) {
aHasRTLFrames = PR_TRUE;
}
}
if (!mIndexMap) {
mIndexMap = new PRInt32[mArraySize];
}
if (!mIndexMap) {
mSuccess = NS_ERROR_OUT_OF_MEMORY;
}
else {
memset(mIndexMap, 0, sizeof(PRUint32) * mArraySize);
mSuccess = mBidiEngine->ReorderVisual(mLevels, count, mIndexMap);
if (NS_SUCCEEDED(mSuccess) ) {
mVisualFrames.Clear();
for (i = 0; i < count; i++) {
mVisualFrames.AppendElement(mLogicalFrames[mIndexMap[i]]);
if (i != mIndexMap[i]) {
aReordered = PR_TRUE;
}
}
} // NS_SUCCEEDED(mSuccess)
} // indexMap
if (NS_FAILED(mSuccess) ) {
aReordered = PR_FALSE;
}
return mSuccess;
}
nsBidiLevel
nsBidiPresUtils::GetFrameEmbeddingLevel(nsIFrame* aFrame)
{
nsIFrame* firstLeaf = aFrame;
while (!IsBidiLeaf(firstLeaf)) {
nsIFrame* firstChild = firstLeaf->GetFirstChild(nsnull);
nsIFrame* realFrame = nsPlaceholderFrame::GetRealFrameFor(firstChild);
firstLeaf = (realFrame->GetType() == nsGkAtoms::letterFrame) ?
realFrame : firstChild;
}
return NS_GET_EMBEDDING_LEVEL(firstLeaf);
}
nsBidiLevel
nsBidiPresUtils::GetFrameBaseLevel(nsIFrame* aFrame)
{
nsIFrame* firstLeaf = aFrame;
while (!IsBidiLeaf(firstLeaf)) {
firstLeaf = firstLeaf->GetFirstChild(nsnull);
}
return NS_GET_BASE_LEVEL(firstLeaf);
}
void
nsBidiPresUtils::IsLeftOrRightMost(nsIFrame* aFrame,
nsContinuationStates* aContinuationStates,
PRBool& aIsLeftMost /* out */,
PRBool& aIsRightMost /* out */) const
{
const nsStyleVisibility* vis = aFrame->GetStyleVisibility();
PRBool isLTR = (NS_STYLE_DIRECTION_LTR == vis->mDirection);
/*
* Since we lay out frames from left to right (in both LTR and RTL), visiting a
* frame with 'mFirstVisualFrame == nsnull', means it's the first appearance of
* one of its continuation chain frames on the line.
* To determine if it's the last visual frame of its continuation chain on the line
* or not, we count the number of frames of the chain on the line, and then reduce
* it when we lay out a frame of the chain. If this value becomes 1 it means
* that it's the last visual frame of its continuation chain on this line.
*/
nsFrameContinuationState* frameState = aContinuationStates->GetEntry(aFrame);
nsFrameContinuationState* firstFrameState;
if (!frameState->mFirstVisualFrame) {
// aFrame is the first visual frame of its continuation chain
nsFrameContinuationState* contState;
nsIFrame* frame;
frameState->mFrameCount = 1;
frameState->mFirstVisualFrame = aFrame;
/**
* Traverse continuation chain of aFrame in both backward and forward
* directions while the frames are on this line. Count the frames and
* set their mFirstVisualFrame to aFrame.
*/
// Traverse continuation chain backward
for (frame = aFrame->GetPrevContinuation();
frame && (contState = aContinuationStates->GetEntry(frame));
frame = frame->GetPrevContinuation()) {
frameState->mFrameCount++;
contState->mFirstVisualFrame = aFrame;
}
frameState->mHasContOnPrevLines = (frame != nsnull);
// Traverse continuation chain forward
for (frame = aFrame->GetNextContinuation();
frame && (contState = aContinuationStates->GetEntry(frame));
frame = frame->GetNextContinuation()) {
frameState->mFrameCount++;
contState->mFirstVisualFrame = aFrame;
}
frameState->mHasContOnNextLines = (frame != nsnull);
aIsLeftMost = isLTR ? !frameState->mHasContOnPrevLines
: !frameState->mHasContOnNextLines;
firstFrameState = frameState;
} else {
// aFrame is not the first visual frame of its continuation chain
aIsLeftMost = PR_FALSE;
firstFrameState = aContinuationStates->GetEntry(frameState->mFirstVisualFrame);
}
aIsRightMost = (firstFrameState->mFrameCount == 1) &&
(isLTR ? !firstFrameState->mHasContOnNextLines
: !firstFrameState->mHasContOnPrevLines);
if ((aIsLeftMost || aIsRightMost) &&
(aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL)) {
// For ib splits, don't treat anything except the last part as
// endmost or anything except the first part as startmost.
// As an optimization, only get the first continuation once.
nsIFrame* firstContinuation = aFrame->GetFirstContinuation();
if (nsLayoutUtils::FrameIsNonLastInIBSplit(firstContinuation)) {
// We are not endmost
if (isLTR) {
aIsRightMost = PR_FALSE;
} else {
aIsLeftMost = PR_FALSE;
}
}
if (nsLayoutUtils::FrameIsNonFirstInIBSplit(firstContinuation)) {
// We are not startmost
if (isLTR) {
aIsLeftMost = PR_FALSE;
} else {
aIsRightMost = PR_FALSE;
}
}
}
// Reduce number of remaining frames of the continuation chain on the line.
firstFrameState->mFrameCount--;
}
void
nsBidiPresUtils::RepositionFrame(nsIFrame* aFrame,
PRBool aIsOddLevel,
nscoord& aLeft,
nsContinuationStates* aContinuationStates) const
{
if (!aFrame)
return;
PRBool isLeftMost, isRightMost;
IsLeftOrRightMost(aFrame,
aContinuationStates,
isLeftMost /* out */,
isRightMost /* out */);
nsInlineFrame* testFrame = do_QueryFrame(aFrame);
if (testFrame) {
aFrame->AddStateBits(NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET);