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gecko/layout/base/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 "nsIRenderingContext.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"
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* newFrame = aFrame->GetNextSibling();
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;
}
// The new parent adopts the new frame
frame->SetNextSibling(nsnull);
rv = newParent->InsertFrames(nsGkAtoms::nextBidi, nsnull, newFrame);
if (NS_FAILED(rv)) {
return rv;
}
// Reparent views as necessary
rv = nsHTMLContainerFrame::ReparentFrameViewList(presContext, newFrame, parent, newParent);
if (NS_FAILED(rv)) {
return rv;
}
// The list name nsGkAtoms::nextBidi would indicate we don't want reflow
rv = grandparent->InsertFrames(nsGkAtoms::nextBidi, parent, newParent);
if (NS_FAILED(rv)) {
return rv;
}
frame = parent;
newFrame = newParent;
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 = 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
rv = parent->InsertFrames(nsGkAtoms::nextBidi, aFrame, *aNewFrame);
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;
return nsFrameList(startFrame).ContainsFrameBefore(aFrame, endFrame);
}
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, embeddingLevel, and charType properties according to the results
* returned by the Bidi engine and CalculateCharType().
*
* The rendering layer requires each text frame to contain text in only one
* direction and of only one character type, 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,
PRBool aIsVisualFormControl)
{
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;
}
PRBool isVisual;
if (aIsVisualFormControl) {
isVisual = PR_FALSE;
} else {
isVisual = presContext->IsVisualMode();
}
mSuccess = mBidiEngine->CountRuns(&runCount);
if (NS_FAILED(mSuccess) ) {
return mSuccess;
}
PRInt32 runLength = 0;
PRInt32 fragmentLength = 0;
PRInt32 temp;
PRInt32 frameIndex = -1;
PRInt32 frameCount = mLogicalFrames.Length();
PRInt32 contentOffset = 0; // offset within current frame
PRInt32 lineOffset = 0; // offset within mBuffer
PRInt32 logicalLimit = 0;
PRInt32 numRun = -1;
PRUint8 charType;
PRUint8 prevType = eCharType_LeftToRight;
PRBool isTextFrame = PR_FALSE;
nsIFrame* frame = nsnull;
nsIFrame* nextBidi;
nsIContent* content = nsnull;
const nsTextFragment* fragment;
nsIAtom* frameType = nsnull;
nsPropertyTable *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;
for (; ;) {
if (fragmentLength <= 0) {
if (++frameIndex >= frameCount) {
break;
}
contentOffset = 0;
frame = mLogicalFrames[frameIndex];
frameType = frame->GetType();
lineNeedsUpdate = PR_TRUE;
if (nsGkAtoms::textFrame == frameType) {
content = frame->GetContent();
if (!content) {
mSuccess = NS_OK;
break;
}
fragment = content->GetText();
if (!fragment) {
mSuccess = NS_ERROR_FAILURE;
break;
}
fragmentLength = fragment->GetLength();
isTextFrame = PR_TRUE;
} // if text frame
else {
isTextFrame = PR_FALSE;
fragmentLength = 1;
}
} // if (fragmentLength <= 0)
if (runLength <= 0) {
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->SetProperty(frame, nsGkAtoms::embeddingLevel,
NS_INT32_TO_PTR(embeddingLevel), nsnull, nsnull);
propTable->SetProperty(frame, nsGkAtoms::baseLevel,
NS_INT32_TO_PTR(paraLevel), nsnull, nsnull);
if (isTextFrame) {
PRInt32 typeLimit = PR_MIN(logicalLimit, lineOffset + fragmentLength);
CalculateCharType(lineOffset, typeLimit, logicalLimit, runLength,
runCount, charType, prevType);
// IBMBIDI - Egypt - Start
propTable->SetProperty(frame, nsGkAtoms::charType,
NS_INT32_TO_PTR(charType), nsnull, nsnull);
// IBMBIDI - Egypt - End
if ( (runLength > 0) && (runLength < fragmentLength) ) {
if (lineNeedsUpdate) {
AdvanceLineIteratorToFrame(frame, &lineIter, prevFrame);
lineNeedsUpdate = PR_FALSE;
}
lineIter.GetLine()->MarkDirty();
if (!EnsureBidiContinuation(frame, &nextBidi, frameIndex,
contentOffset,
contentOffset + runLength,
lineNeedsUpdate)) {
break;
}
frame = nextBidi;
contentOffset += runLength;
} // if (runLength < fragmentLength)
else {
PRInt32 newIndex = 0;
mContentToFrameIndex.Get(content, &newIndex);
if (newIndex > frameIndex) {
RemoveBidiContinuation(frame, frameIndex, newIndex, temp);
if (lineNeedsUpdate) {
AdvanceLineIteratorToFrame(frame, &lineIter, prevFrame);
lineNeedsUpdate = PR_FALSE;
}
lineIter.GetLine()->MarkDirty();
runLength -= temp;
fragmentLength -= temp;
lineOffset += temp;
frameIndex = newIndex;
}
frame->AdjustOffsetsForBidi(contentOffset, contentOffset + fragmentLength);
}
} // isTextFrame
else {
++lineOffset;
}
} // not directionalFrame
temp = runLength;
runLength -= fragmentLength;
fragmentLength -= temp;
if (frame && fragmentLength <= 0) {
if (runLength <= 0) {
// If the frame is at the end of a run, split all ancestor inlines that need splitting.
nsIFrame* child = frame;
nsIFrame* parent = frame->GetParent();
// As long as we're on the last sibling, the parent doesn't have to be split.
while (parent &&
IsBidiSplittable(parent) &&
!child->GetNextSibling()) {
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
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 an inline container, we need to
// drill down into it and include its contents in Bidi resolution. If it
// isn't an inline container, we just use the placeholder.
nsIFrame* frame = childFrame;
if (nsGkAtoms::placeholderFrame == childFrame->GetType()) {
nsIFrame* realFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(childFrame);
if (realFrame->IsFrameOfType(nsIFrame::eBidiInlineContainer)) {
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)) {
firstLeaf = firstLeaf->GetFirstChild(nsnull);
}
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);
// 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);
if (isLeftMost)
aFrame->AddStateBits(NS_INLINE_FRAME_BIDI_VISUAL_IS_LEFT_MOST);
else
aFrame->RemoveStateBits(NS_INLINE_FRAME_BIDI_VISUAL_IS_LEFT_MOST);
if (isRightMost)
aFrame->AddStateBits(NS_INLINE_FRAME_BIDI_VISUAL_IS_RIGHT_MOST);
else
aFrame->RemoveStateBits(NS_INLINE_FRAME_BIDI_VISUAL_IS_RIGHT_MOST);
}
// This method is called from nsBlockFrame::PlaceLine via the call to
// bidiUtils->ReorderFrames, so this is guaranteed to be after the inlines
// have been reflowed, which is required for GetUsedMargin/Border/Padding
nsMargin margin = aFrame->GetUsedMargin();
if (isLeftMost)
aLeft += margin.left;
nscoord start = aLeft;
if (!IsBidiLeaf(aFrame))
{
nscoord x = 0;
nsMargin borderPadding = aFrame->GetUsedBorderAndPadding();
if (isLeftMost) {
x += borderPadding.left;
}
// If aIsOddLevel is true, so we need to traverse the child list
// in reverse order, to make it O(n) we store the list locally and
// iterate the list reversely
nsTArray<nsIFrame*> childList;
nsIFrame *frame = aFrame->GetFirstChild(nsnull);
if (frame && aIsOddLevel) {
childList.AppendElement((nsIFrame*)nsnull);
while (frame) {
childList.AppendElement(frame);
frame = frame->GetNextSibling();
}
frame = childList[childList.Length() - 1];
}
// Reposition the child frames
PRInt32 index = 0;
while (frame) {
RepositionFrame(frame,
aIsOddLevel,
x,
aContinuationStates);
index++;
frame = aIsOddLevel ?
childList[childList.Length() - index - 1] :
frame->GetNextSibling();
}
if (isRightMost) {
x += borderPadding.right;
}
aLeft += x;
} else {
aLeft += aFrame->GetSize().width;
}
nsRect rect = aFrame->GetRect();
aFrame->SetRect(nsRect(start, rect.y, aLeft - start, rect.height));
if (isRightMost)
aLeft += margin.right;
}
void
nsBidiPresUtils::InitContinuationStates(nsIFrame* aFrame,
nsContinuationStates* aContinuationStates) const
{
nsFrameContinuationState* state = aContinuationStates->PutEntry(aFrame);
state->mFirstVisualFrame = nsnull;
state->mFrameCount = 0;
if (!IsBidiLeaf(aFrame)) {
// Continue for child frames
nsIFrame* frame;
for (frame = aFrame->GetFirstChild(nsnull);
frame;
frame = frame->GetNextSibling()) {
InitContinuationStates(frame,
aContinuationStates);
}
}
}
void
nsBidiPresUtils::RepositionInlineFrames(nsIFrame* aFirstChild) const
{
const nsStyleVisibility* vis = aFirstChild->GetStyleVisibility();
PRBool isLTR = (NS_STYLE_DIRECTION_LTR == vis->mDirection);
nscoord leftSpace = 0;
// This method is called from nsBlockFrame::PlaceLine via the call to
// bidiUtils->ReorderFrames, so this is guaranteed to be after the inlines
// have been reflowed, which is required for GetUsedMargin/Border/Padding
nsMargin margin = aFirstChild->GetUsedMargin();
if (!aFirstChild->GetPrevContinuation())
leftSpace = isLTR ? margin.left : margin.right;
nscoord left = aFirstChild->GetPosition().x - leftSpace;
nsIFrame* frame;
PRInt32 count = mVisualFrames.Length();
PRInt32 index;
nsContinuationStates continuationStates;
continuationStates.Init();
// Initialize continuation states to (nsnull, 0) for
// each frame on the line.
for (index = 0; index < count; index++) {
InitContinuationStates(mVisualFrames[index], &continuationStates);
}
// Reposition frames in visual order
for (index = 0; index < count; index++) {
frame = mVisualFrames[index];
RepositionFrame(frame,
(mLevels[mIndexMap[index]] & 1),
left,
&continuationStates);
} // for
}
void
nsBidiPresUtils::InitLogicalArrayFromLine(nsIFrame* aFirstFrameOnLine,
PRInt32 aNumFramesOnLine) {
mLogicalFrames.Clear();
for (nsIFrame* frame = aFirstFrameOnLine;
frame && aNumFramesOnLine--;
frame = frame->GetNextSibling()) {
mLogicalFrames.AppendElement(frame);
}
}
PRBool
nsBidiPresUtils::CheckLineOrder(nsIFrame* aFirstFrameOnLine,
PRInt32 aNumFramesOnLine,
nsIFrame** aFirstVisual,
nsIFrame** aLastVisual)
{
InitLogicalArrayFromLine(aFirstFrameOnLine, aNumFramesOnLine);
PRBool isReordered;
PRBool hasRTLFrames;
Reorder(isReordered, hasRTLFrames);
PRInt32 count = mLogicalFrames.Length();
if (aFirstVisual) {
*aFirstVisual = mVisualFrames[0];
}
if (aLastVisual) {
*aLastVisual = mVisualFrames[count-1];
}
// If there's an RTL frame, assume the line is reordered
return isReordered || hasRTLFrames;
}
nsIFrame*
nsBidiPresUtils::GetFrameToRightOf(const nsIFrame* aFrame,
nsIFrame* aFirstFrameOnLine,
PRInt32 aNumFramesOnLine)
{
InitLogicalArrayFromLine(aFirstFrameOnLine, aNumFramesOnLine);
PRBool isReordered;
PRBool hasRTLFrames;
Reorder(isReordered, hasRTLFrames);
PRInt32 count = mVisualFrames.Length();
if (aFrame == nsnull)
return mVisualFrames[0];
for (PRInt32 i = 0; i < count - 1; i++) {
if (mVisualFrames[i] == aFrame) {
return mVisualFrames[i+1];
}
}
return nsnull;
}
nsIFrame*
nsBidiPresUtils::GetFrameToLeftOf(const nsIFrame* aFrame,
nsIFrame* aFirstFrameOnLine,
PRInt32 aNumFramesOnLine)
{
InitLogicalArrayFromLine(aFirstFrameOnLine, aNumFramesOnLine);
PRBool isReordered;
PRBool hasRTLFrames;
Reorder(isReordered, hasRTLFrames);
PRInt32 count = mVisualFrames.Length();
if (aFrame == nsnull)
return mVisualFrames[count-1];
for (PRInt32 i = 1; i < count; i++) {
if (mVisualFrames[i] == aFrame) {
return mVisualFrames[i-1];
}
}
return nsnull;
}
PRBool
nsBidiPresUtils::EnsureBidiContinuation(nsIFrame* aFrame,
nsIFrame** aNewFrame,
PRInt32& aFrameIndex,
PRInt32 aStart,
PRInt32 aEnd,
PRInt32& aLineNeedsUpdate)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
NS_PRECONDITION(aFrame, "aFrame is null");
NS_ASSERTION(!aFrame->GetPrevInFlow(),
"Calling EnsureBidiContinuation on non-first-in-flow");
*aNewFrame = nsnull;
nsBidiLevel embeddingLevel = NS_GET_EMBEDDING_LEVEL(aFrame);
nsBidiLevel baseLevel = NS_GET_BASE_LEVEL(aFrame);
nsCharType charType = (nsCharType)NS_PTR_TO_INT32(aFrame->GetProperty(nsGkAtoms::charType));
// Skip fluid continuations
while (aFrameIndex + 1 < PRInt32(mLogicalFrames.Length())) {
nsIFrame* frame = mLogicalFrames[aFrameIndex + 1];
if (frame->GetPrevInFlow() != aFrame) {
// If we found a non-fluid continuation, use it
if (frame->GetPrevContinuation() == aFrame) {
*aNewFrame = frame;
aFrameIndex++;
// The frame we found might be on another line. If so, the line iterator
// should be updated.
aLineNeedsUpdate = PR_TRUE;
}
break;
}
frame->SetProperty(nsGkAtoms::embeddingLevel, NS_INT32_TO_PTR(embeddingLevel));
frame->SetProperty(nsGkAtoms::baseLevel, NS_INT32_TO_PTR(baseLevel));
frame->SetProperty(nsGkAtoms::charType, NS_INT32_TO_PTR(charType));
frame->AddStateBits(NS_FRAME_IS_BIDI);
aFrameIndex++;
aFrame->AdjustOffsetsForBidi(aStart, aStart);
aFrame = frame;
}
aFrame->AdjustOffsetsForBidi(aStart, aEnd);
if (!*aNewFrame) {
mSuccess = CreateBidiContinuation(aFrame, aNewFrame);
if (NS_FAILED(mSuccess) ) {
return PR_FALSE;
}
}
return PR_TRUE;
}
void
nsBidiPresUtils::RemoveBidiContinuation(nsIFrame* aFrame,
PRInt32 aFirstIndex,
PRInt32 aLastIndex,
PRInt32& aOffset) const
{
aOffset = 0;
nsresult rv;
nsBidiLevel embeddingLevel = (nsCharType)NS_PTR_TO_INT32(aFrame->GetProperty(nsGkAtoms::embeddingLevel, &rv));
NS_ASSERTION(NS_SUCCEEDED(rv), "embeddingLevel attribute missing from aFrame");
nsBidiLevel baseLevel = (nsCharType)NS_PTR_TO_INT32(aFrame->GetProperty(nsGkAtoms::baseLevel, &rv));
NS_ASSERTION(NS_SUCCEEDED(rv), "baseLevel attribute missing from aFrame");
nsCharType charType = (nsCharType)NS_PTR_TO_INT32(aFrame->GetProperty(nsGkAtoms::charType, &rv));
NS_ASSERTION(NS_SUCCEEDED(rv), "charType attribute missing from aFrame");
for (PRInt32 index = aFirstIndex + 1; index <= aLastIndex; index++) {
nsIFrame* frame = mLogicalFrames[index];
if (nsGkAtoms::directionalFrame == frame->GetType()) {
frame->Destroy();
++aOffset;
}
else {
// Make the frame and its continuation ancestors fluid,
// so they can be reused or deleted by normal reflow code
frame->SetProperty(nsGkAtoms::embeddingLevel, NS_INT32_TO_PTR(embeddingLevel));
frame->SetProperty(nsGkAtoms::baseLevel, NS_INT32_TO_PTR(baseLevel));
frame->SetProperty(nsGkAtoms::charType, NS_INT32_TO_PTR(charType));
frame->AddStateBits(NS_FRAME_IS_BIDI);
while (frame) {
nsIFrame* prev = frame->GetPrevContinuation();
if (prev) {
NS_ASSERTION (!frame->GetPrevInFlow() || frame->GetPrevInFlow() == prev,
"prev-in-flow is not prev continuation!");
frame->SetPrevInFlow(prev);
NS_ASSERTION (!prev->GetNextInFlow() || prev->GetNextInFlow() == frame,
"next-in-flow is not next continuation!");
prev->SetNextInFlow(frame);
frame = frame->GetParent();
} else {
break;
}
}
}
}
}
nsresult
nsBidiPresUtils::FormatUnicodeText(nsPresContext* aPresContext,
PRUnichar* aText,
PRInt32& aTextLength,
nsCharType aCharType,
PRBool aIsOddLevel)
{
NS_ASSERTION(aIsOddLevel == 0 || aIsOddLevel == 1, "aIsOddLevel should be 0 or 1");
nsresult rv = NS_OK;
// ahmed
//adjusted for correct numeral shaping
PRUint32 bidiOptions = aPresContext->GetBidi();
switch (GET_BIDI_OPTION_NUMERAL(bidiOptions)) {
case IBMBIDI_NUMERAL_HINDI:
HandleNumbers(aText,aTextLength,IBMBIDI_NUMERAL_HINDI);
break;
case IBMBIDI_NUMERAL_ARABIC:
HandleNumbers(aText,aTextLength,IBMBIDI_NUMERAL_ARABIC);
break;
case IBMBIDI_NUMERAL_PERSIAN:
HandleNumbers(aText,aTextLength,IBMBIDI_NUMERAL_PERSIAN);
break;
case IBMBIDI_NUMERAL_REGULAR:
switch (aCharType) {
case eCharType_EuropeanNumber:
HandleNumbers(aText,aTextLength,IBMBIDI_NUMERAL_ARABIC);
break;
case eCharType_ArabicNumber:
HandleNumbers(aText,aTextLength,IBMBIDI_NUMERAL_HINDI);
break;
default:
break;
}
break;
case IBMBIDI_NUMERAL_HINDICONTEXT:
if ( ( (GET_BIDI_OPTION_DIRECTION(bidiOptions)==IBMBIDI_TEXTDIRECTION_RTL) && (IS_ARABIC_DIGIT (aText[0])) ) || (eCharType_ArabicNumber == aCharType) )
HandleNumbers(aText,aTextLength,IBMBIDI_NUMERAL_HINDI);
else if (eCharType_EuropeanNumber == aCharType)
HandleNumbers(aText,aTextLength,IBMBIDI_NUMERAL_ARABIC);
break;
case IBMBIDI_NUMERAL_PERSIANCONTEXT:
if ( ( (GET_BIDI_OPTION_DIRECTION(bidiOptions)==IBMBIDI_TEXTDIRECTION_RTL) && (IS_ARABIC_DIGIT (aText[0])) ) || (eCharType_ArabicNumber == aCharType) )
HandleNumbers(aText,aTextLength,IBMBIDI_NUMERAL_PERSIAN);
else if (eCharType_EuropeanNumber == aCharType)
HandleNumbers(aText,aTextLength,IBMBIDI_NUMERAL_ARABIC);
break;
case IBMBIDI_NUMERAL_NOMINAL:
default:
break;
}
StripBidiControlCharacters(aText, aTextLength);
return rv;
}
void
nsBidiPresUtils::StripBidiControlCharacters(PRUnichar* aText,
PRInt32& aTextLength) const
{
if ( (nsnull == aText) || (aTextLength < 1) ) {
return;
}
PRInt32 stripLen = 0;
for (PRInt32 i = 0; i < aTextLength; i++) {
// XXX: This silently ignores surrogate characters.
// As of Unicode 4.0, all Bidi control characters are within the BMP.
if (IsBidiControl((PRUint32)aText[i])) {
++stripLen;
}
else {
aText[i - stripLen] = aText[i];
}
}
aTextLength -= stripLen;
}
#if 0 // XXX: for the future use ???
void
RemoveDiacritics(PRUnichar* aText,
PRInt32& aTextLength)
{
if (aText && (aTextLength > 0) ) {
PRInt32 offset = 0;
for (PRInt32 i = 0; i < aTextLength && aText[i]; i++) {
if (IS_BIDI_DIACRITIC(aText[i]) ) {
++offset;
continue;
}
aText[i - offset] = aText[i];
}
aTextLength = i - offset;
aText[aTextLength] = 0;
}
}
#endif
void
nsBidiPresUtils::CalculateCharType(PRInt32& aOffset,
PRInt32 aCharTypeLimit,
PRInt32& aRunLimit,
PRInt32& aRunLength,
PRInt32& aRunCount,
PRUint8& aCharType,
PRUint8& aPrevCharType) const
{
PRBool strongTypeFound = PR_FALSE;
PRInt32 offset;
nsCharType charType;
aCharType = eCharType_OtherNeutral;
for (offset = aOffset; offset < aCharTypeLimit; offset++) {
// Make sure we give RTL chartype to all characters that would be classified
// as Right-To-Left by a bidi platform.
// (May differ from the UnicodeData, eg we set RTL chartype to some NSMs.)
if (IS_HEBREW_CHAR(mBuffer[offset]) ) {
charType = eCharType_RightToLeft;
}
else if (IS_ARABIC_ALPHABETIC(mBuffer[offset]) ) {
charType = eCharType_RightToLeftArabic;
}
else {
mBidiEngine->GetCharTypeAt(offset, &charType);
}
if (!CHARTYPE_IS_WEAK(charType) ) {
if (strongTypeFound
&& (charType != aPrevCharType)
&& (CHARTYPE_IS_RTL(charType) || CHARTYPE_IS_RTL(aPrevCharType) ) ) {
// Stop at this point to ensure uni-directionality of the text
// (from platform's point of view).
// Also, don't mix Arabic and Hebrew content (since platform may
// provide BIDI support to one of them only).
aRunLength = offset - aOffset;
aRunLimit = offset;
++aRunCount;
break;
}
if ( (eCharType_RightToLeftArabic == aPrevCharType
|| eCharType_ArabicNumber == aPrevCharType)
&& eCharType_EuropeanNumber == charType) {
charType = eCharType_ArabicNumber;
}
// Set PrevCharType to the last strong type in this frame
// (for correct numeric shaping)
aPrevCharType = charType;
strongTypeFound = PR_TRUE;
aCharType = charType;
}
}
aOffset = offset;
}
nsresult nsBidiPresUtils::GetBidiEngine(nsBidi** aBidiEngine)
{
nsresult rv = NS_ERROR_FAILURE;
if (mBidiEngine) {
*aBidiEngine = mBidiEngine;
rv = NS_OK;
}
return rv;
}
nsresult nsBidiPresUtils::ProcessText(const PRUnichar* aText,
PRInt32 aLength,
nsBidiDirection aBaseDirection,
nsPresContext* aPresContext,
BidiProcessor& aprocessor,
Mode aMode,
nsBidiPositionResolve* aPosResolve,
PRInt32 aPosResolveCount,
nscoord* aWidth)
{
NS_ASSERTION((aPosResolve == nsnull) != (aPosResolveCount > 0), "Incorrect aPosResolve / aPosResolveCount arguments");
PRInt32 runCount;
mBuffer.Assign(aText, aLength);
nsresult rv = mBidiEngine->SetPara(mBuffer.get(), aLength, aBaseDirection, nsnull);
if (NS_FAILED(rv))
return rv;
rv = mBidiEngine->CountRuns(&runCount);
if (NS_FAILED(rv))
return rv;
nscoord xOffset = 0;
nscoord width, xEndRun;
nscoord totalWidth = 0;
PRInt32 i, start, limit, length;
PRUint32 visualStart = 0;
PRUint8 charType;
PRUint8 prevType = eCharType_LeftToRight;
nsBidiLevel level;
for(int nPosResolve=0; nPosResolve < aPosResolveCount; ++nPosResolve)
{
aPosResolve[nPosResolve].visualIndex = kNotFound;
aPosResolve[nPosResolve].visualLeftTwips = kNotFound;
aPosResolve[nPosResolve].visualWidth = kNotFound;
}
for (i = 0; i < runCount; i++) {
rv = mBidiEngine->GetVisualRun(i, &start, &length, &aBaseDirection);
if (NS_FAILED(rv))
return rv;
rv = mBidiEngine->GetLogicalRun(start, &limit, &level);
if (NS_FAILED(rv))
return rv;
PRInt32 subRunLength = limit - start;
PRInt32 lineOffset = start;
PRInt32 typeLimit = PR_MIN(limit, aLength);
PRInt32 subRunCount = 1;
PRInt32 subRunLimit = typeLimit;
/*
* If |level| is even, i.e. the direction of the run is left-to-right, we
* render the subruns from left to right and increment the x-coordinate
* |xOffset| by the width of each subrun after rendering.
*
* If |level| is odd, i.e. the direction of the run is right-to-left, we
* render the subruns from right to left. We begin by incrementing |xOffset| by
* the width of the whole run, and then decrement it by the width of each
* subrun before rendering. After rendering all the subruns, we restore the
* x-coordinate of the end of the run for the start of the next run.
*/
if (level & 1) {
aprocessor.SetText(aText + start, subRunLength, nsBidiDirection(level & 1));
width = aprocessor.GetWidth();
xOffset += width;
xEndRun = xOffset;
}
while (subRunCount > 0) {
// CalculateCharType can increment subRunCount if the run
// contains mixed character types
CalculateCharType(lineOffset, typeLimit, subRunLimit, subRunLength, subRunCount, charType, prevType);
nsAutoString runVisualText;
runVisualText.Assign(aText + start, subRunLength);
if (PRInt32(runVisualText.Length()) < subRunLength)
return NS_ERROR_OUT_OF_MEMORY;
FormatUnicodeText(aPresContext, runVisualText.BeginWriting(), subRunLength,
(nsCharType)charType, level & 1);
aprocessor.SetText(runVisualText.get(), subRunLength, nsBidiDirection(level & 1));
width = aprocessor.GetWidth();
totalWidth += width;
if (level & 1) {
xOffset -= width;
}
if (aMode == MODE_DRAW) {
aprocessor.DrawText(xOffset, width);
}
/*
* The caller may request to calculate the visual position of one
* or more characters.
*/
for(int nPosResolve=0; nPosResolve<aPosResolveCount; ++nPosResolve)
{
nsBidiPositionResolve* posResolve = &aPosResolve[nPosResolve];
/*
* Did we already resolve this position's visual metric? If so, skip.
*/
if (posResolve->visualLeftTwips != kNotFound)
continue;
/*
* First find out if the logical position is within this run.
*/
if (start <= posResolve->logicalIndex &&
start + subRunLength > posResolve->logicalIndex) {
/*
* If this run is only one character long, we have an easy case:
* the visual position is the x-coord of the start of the run
* less the x-coord of the start of the whole text.
*/
if (subRunLength == 1) {
posResolve->visualIndex = visualStart;
posResolve->visualLeftTwips = xOffset;
posResolve->visualWidth = width;
}
/*
* Otherwise, we need to measure the width of the run's part
* which is to the visual left of the index.
* In other words, the run is broken in two, around the logical index,
* and we measure the part which is visually left.
* If the run is right-to-left, this part will span from after the index
* up to the end of the run; if it is left-to-right, this part will span
* from the start of the run up to (and inclduing) the character before the index.
*/
else {
/*
* Here is a description of how the width of the current character
* (posResolve->visualWidth) is calculated:
*
* LTR (current char: "P"):
* S A M P L E (logical index: 3, visual index: 3)
* ^ (visualLeftPart)
* ^ (visualRightSide)
* visualLeftLength == 3
* ^^^^^^ (subWidth)
* ^^^^^^^^ (aprocessor.GetWidth() -- with visualRightSide)
* ^^ (posResolve->visualWidth)
*
* RTL (current char: "M"):
* E L P M A S (logical index: 2, visual index: 3)
* ^ (visualLeftPart)
* ^ (visualRightSide)
* visualLeftLength == 3
* ^^^^^^ (subWidth)
* ^^^^^^^^ (aprocessor.GetWidth() -- with visualRightSide)
* ^^ (posResolve->visualWidth)
*/
nscoord subWidth;
// The position in the text where this run's "left part" begins.
const PRUnichar* visualLeftPart, *visualRightSide;
if (level & 1) {
// One day, son, this could all be replaced with mBidiEngine.GetVisualIndex ...
posResolve->visualIndex = visualStart + (subRunLength - (posResolve->logicalIndex + 1 - start));
// Skipping to the "left part".
visualLeftPart = aText + posResolve->logicalIndex + 1;
// Skipping to the right side of the current character
visualRightSide = visualLeftPart - 1;
}
else {
posResolve->visualIndex = visualStart + (posResolve->logicalIndex - start);
// Skipping to the "left part".
visualLeftPart = aText + start;
// In LTR mode this is the same as visualLeftPart
visualRightSide = visualLeftPart;
}
// The delta between the start of the run and the left part's end.
PRInt32 visualLeftLength = posResolve->visualIndex - visualStart;
aprocessor.SetText(visualLeftPart, visualLeftLength, nsBidiDirection(level & 1));
subWidth = aprocessor.GetWidth();
aprocessor.SetText(visualRightSide, visualLeftLength + 1, nsBidiDirection(level & 1));
posResolve->visualLeftTwips = xOffset + subWidth;
posResolve->visualWidth = aprocessor.GetWidth() - subWidth;
}
}
}
if (!(level & 1)) {
xOffset += width;
}
--subRunCount;
start = lineOffset;
subRunLimit = typeLimit;
subRunLength = typeLimit - lineOffset;
} // while
if (level & 1) {
xOffset = xEndRun;
}
visualStart += length;
} // for
if (aWidth) {
*aWidth = totalWidth;
}
return NS_OK;
}
class NS_STACK_CLASS nsIRenderingContextBidiProcessor : public nsBidiPresUtils::BidiProcessor {
public:
nsIRenderingContextBidiProcessor(nsIRenderingContext* aCtx,
const nsPoint& aPt)
: mCtx(aCtx), mPt(aPt) { }
~nsIRenderingContextBidiProcessor()
{
mCtx->SetRightToLeftText(PR_FALSE);
}
virtual void SetText(const PRUnichar* aText,
PRInt32 aLength,
nsBidiDirection aDirection)
{
mCtx->SetTextRunRTL(aDirection==NSBIDI_RTL);
mText = aText;
mLength = aLength;
}
virtual nscoord GetWidth()
{
nscoord width;
mCtx->GetWidth(mText, mLength, width, nsnull);
return width;
}
virtual void DrawText(nscoord aXOffset,
nscoord)
{
mCtx->DrawString(mText, mLength, mPt.x + aXOffset, mPt.y);
}
private:
nsPoint mPt;
nsIRenderingContext* mCtx;
const PRUnichar* mText;
PRInt32 mLength;
nsBidiDirection mDirection;
};
nsresult nsBidiPresUtils::ProcessTextForRenderingContext(const PRUnichar* aText,
PRInt32 aLength,
nsBidiDirection aBaseDirection,
nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
Mode aMode,
nscoord aX,
nscoord aY,
nsBidiPositionResolve* aPosResolve,
PRInt32 aPosResolveCount,
nscoord* aWidth)
{
nsIRenderingContextBidiProcessor processor(&aRenderingContext, nsPoint(aX, aY));
return ProcessText(aText, aLength, aBaseDirection, aPresContext, processor,
aMode, aPosResolve, aPosResolveCount, aWidth);
}
#endif // IBMBIDI
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