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gecko-dev/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: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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):
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifdef IBMBIDI
#define FIX_FOR_BUG_40882
#include "nsBidiPresUtils.h"
#include "nsITextContent.h"
#include "nsTextFragment.h"
#include "nsLayoutAtoms.h"
#include "nsIPresContext.h"
#include "nsIRenderingContext.h"
#include "nsIServiceManager.h"
#include "nsIFrameManager.h"
#include "nsBidiFrames.h"
#include "nsITextFrame.h"
#include "nsBidiUtils.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;
#ifdef FIX_FOR_BUG_40882
static const PRUnichar ALEF = 0x05D0;
#endif
#define CHAR_IS_HEBREW(c) ((0x0590 <= (c)) && ((c)<= 0x05FF))
// Note: The above code are moved from gfx/src/windows/nsRenderingContextWin.cpp
extern nsresult
NS_NewContinuingTextFrame(nsIPresShell* aPresShell, nsIFrame** aResult);
extern nsresult
NS_NewDirectionalFrame(nsIFrame** aNewFrame, PRUnichar aChar);
nsBidiPresUtils::nsBidiPresUtils() : mArraySize(8),
mIndexMap(nsnull),
mLevels(nsnull),
mSuccess(NS_ERROR_FAILURE),
mBidiEngine(nsnull)
{
mBidiEngine = new nsBidi();
if (mBidiEngine) {
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() */
static nsresult
CreateBidiContinuation(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aFrame,
nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
*aNewFrame = nsnull;
NS_PRECONDITION(aFrame, "null ptr");
nsIFrame* parent;
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell) );
NS_ASSERTION(presShell, "PresShell must be set on PresContext before calling nsBidiPresUtils::CreateBidiContinuation");
NS_NewContinuingTextFrame(presShell, aNewFrame);
if (!(*aNewFrame) ) {
return NS_ERROR_OUT_OF_MEMORY;
}
nsCOMPtr<nsIStyleContext> styleContext;
aFrame->GetStyleContext(getter_AddRefs(styleContext) );
NS_ASSERTION(presShell, "Frame has no styleContext in nsBidiPresUtils::CreateBidiContinuation");
aFrame->GetParent(&parent);
NS_ASSERTION(presShell, "Couldn't get frame parent in nsBidiPresUtils::CreateBidiContinuation");
(*aNewFrame)->Init(aPresContext, aContent, parent, styleContext, nsnull);
// XXX: TODO: Instead, create and insert entire frame list
(*aNewFrame)->SetNextSibling(nsnull);
// The list name nsLayoutAtoms::nextBidi would indicate we don't want reflow
parent->InsertFrames(aPresContext, *presShell, nsLayoutAtoms::nextBidi,
aFrame, *aNewFrame);
return NS_OK;
}
nsresult
nsBidiPresUtils::Resolve(nsIPresContext* aPresContext,
nsIFrame* aBlockFrame,
nsIFrame* aFirstChild,
PRBool& aForceReflow,
PRBool aIsVisualFormControl)
{
aForceReflow = PR_FALSE;
mLogicalFrames.Clear();
// handle bidi-override being set on the block itself before calling
// InitLogicalArray.
const nsStyleVisibility* vis;
aBlockFrame->GetStyleData(eStyleStruct_Visibility,
NS_REINTERPRET_CAST(const nsStyleStruct*&, vis));
const nsStyleTextReset* text;
aBlockFrame->GetStyleData(eStyleStruct_TextReset,
NS_REINTERPRET_CAST(const nsStyleStruct*&, text));
if (text->mUnicodeBidi == NS_STYLE_UNICODE_BIDI_OVERRIDE) {
nsresult rv;
nsIFrame *directionalFrame = nsnull;
if (NS_STYLE_DIRECTION_RTL == vis->mDirection) {
rv = NS_NewDirectionalFrame(&directionalFrame, kRLO);
}
else if (NS_STYLE_DIRECTION_LTR == vis->mDirection) {
rv = NS_NewDirectionalFrame(&directionalFrame, kLRO);
}
if (directionalFrame && NS_SUCCEEDED(rv)) {
mLogicalFrames.AppendElement(directionalFrame);
}
}
mSuccess = InitLogicalArray(aPresContext, aFirstChild, nsnull, PR_TRUE);
if (text->mUnicodeBidi == NS_STYLE_UNICODE_BIDI_OVERRIDE) {
nsIFrame *directionalFrame = nsnull;
nsresult rv = NS_NewDirectionalFrame(&directionalFrame, kPDF);
if (directionalFrame && NS_SUCCEEDED(rv)) {
mLogicalFrames.AppendElement(directionalFrame);
}
}
if (NS_FAILED(mSuccess) ) {
return mSuccess;
}
CreateBlockBuffer(aPresContext);
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 {
aPresContext->IsVisualMode(isVisual);
}
mSuccess = mBidiEngine->CountRuns(&runCount);
if (NS_FAILED(mSuccess) ) {
return mSuccess;
}
PRInt32 runLength = 0;
PRInt32 fragmentLength = 0;
PRInt32 temp;
PRInt32 frameIndex = -1;
PRInt32 frameCount = mLogicalFrames.Count();
PRInt32 contentOffset; // offset within current frame
PRInt32 lineOffset = 0; // offset within mBuffer
PRInt32 logicalLimit = 0;
PRInt32 numRun = -1;
PRUint8 charType;
PRUint8 prevType = eCharType_LeftToRight;
PRBool isTextFrame;
nsIFrame* frame = nsnull;
nsIFrame* nextBidi;
nsITextFrame* textFrame;
nsCOMPtr<nsIAtom> frameType;
nsCOMPtr<nsIContent> content;
nsCOMPtr<nsITextContent> textContent;
const nsTextFragment* fragment;
for (; ;) {
textFrame = nsnull;
if (fragmentLength <= 0) {
if (++frameIndex >= frameCount) {
break;
}
contentOffset = 0;
frame = (nsIFrame*) (mLogicalFrames[frameIndex]);
frame->GetFrameType(getter_AddRefs(frameType) );
if (nsLayoutAtoms::textFrame == frameType.get() ) {
mSuccess = frame->GetContent(getter_AddRefs(content) );
if (NS_FAILED(mSuccess) || (!content) ) {
break;
}
textContent = do_QueryInterface(content, &mSuccess);
if (NS_FAILED(mSuccess) || (!textContent) ) {
break;
}
textContent->GetText(&fragment);
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 (nsLayoutAtoms::directionalFrame == frameType.get()) {
delete frame;
++lineOffset;
}
else {
frame->SetBidiProperty(aPresContext, nsLayoutAtoms::embeddingLevel,
(void *)embeddingLevel);
frame->SetBidiProperty(aPresContext, nsLayoutAtoms::baseLevel,
(void *)paraLevel);
if (isTextFrame) {
PRInt32 typeLimit = PR_MIN(logicalLimit, lineOffset + fragmentLength);
CalculateCharType(lineOffset, typeLimit, logicalLimit, runLength,
runCount, charType, prevType);
// IBMBIDI - Egypt - Start
frame->SetBidiProperty(aPresContext,nsLayoutAtoms::charType,(void*)charType);
// IBMBIDI - Egypt - End
if ( (runLength > 0) && (runLength < fragmentLength) ) {
if (!EnsureBidiContinuation(aPresContext, content.get(), frame,
&nextBidi, frameIndex) ) {
break;
}
frame->QueryInterface(NS_GET_IID(nsITextFrame), (void**) &textFrame);
if (textFrame) {
textFrame->SetOffsets(contentOffset, contentOffset + runLength);
nsFrameState frameState;
frame->GetFrameState(&frameState);
frameState |= NS_FRAME_IS_BIDI;
frame->SetFrameState(frameState);
}
frame = nextBidi;
contentOffset += runLength;
} // if (runLength < fragmentLength)
else {
frame->QueryInterface(NS_GET_IID(nsITextFrame), (void**) &textFrame);
if (textFrame) {
textFrame->SetOffsets(contentOffset, contentOffset + fragmentLength);
nsFrameState frameState;
frame->GetFrameState(&frameState);
frameState |= NS_FRAME_IS_BIDI;
frame->SetFrameState(frameState);
}
frame->GetBidiProperty(aPresContext, nsLayoutAtoms::nextBidi,
(void**) &nextBidi,sizeof(nextBidi));
if (RemoveBidiContinuation(aPresContext, frame, nextBidi,
content.get(), frameIndex, temp) ) {
aForceReflow = PR_TRUE;
runLength -= temp;
lineOffset += temp;
}
}
} // isTextFrame
else {
++lineOffset;
}
} // not directionalFrame
temp = runLength;
runLength -= fragmentLength;
fragmentLength -= temp;
} // for
return mSuccess;
}
nsresult
nsBidiPresUtils::InitLogicalArray(nsIPresContext* aPresContext,
nsIFrame* aCurrentFrame,
nsIFrame* aNextInFlow,
PRBool aAddMarkers)
{
nsIFrame* frame;
nsIFrame* directionalFrame;
nsIFrame* kid;
nsCOMPtr<nsIAtom> frameType;
const nsStyleDisplay* display;
nsresult rv;
nsresult res = NS_OK;
for (frame = aCurrentFrame;
frame && frame != aNextInFlow;
frame->GetNextSibling(&frame) ) {
rv = NS_ERROR_FAILURE;
frame->GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&) display);
if (aAddMarkers && !display->IsBlockLevel() ) {
const nsStyleVisibility* vis;
frame->GetStyleData(eStyleStruct_Visibility,
NS_REINTERPRET_CAST(const nsStyleStruct*&, vis));
const nsStyleTextReset* text;
frame->GetStyleData(eStyleStruct_TextReset,
NS_REINTERPRET_CAST(const nsStyleStruct*&, text));
switch (text->mUnicodeBidi) {
case NS_STYLE_UNICODE_BIDI_NORMAL:
break;
case NS_STYLE_UNICODE_BIDI_EMBED:
if (NS_STYLE_DIRECTION_RTL == vis->mDirection) {
rv = NS_NewDirectionalFrame(&directionalFrame, kRLE);
}
else if (NS_STYLE_DIRECTION_LTR == vis->mDirection) {
rv = NS_NewDirectionalFrame(&directionalFrame, kLRE);
}
break;
case NS_STYLE_UNICODE_BIDI_OVERRIDE:
if (NS_STYLE_DIRECTION_RTL == vis->mDirection) {
rv = NS_NewDirectionalFrame(&directionalFrame, kRLO);
}
else if (NS_STYLE_DIRECTION_LTR == vis->mDirection) {
rv = NS_NewDirectionalFrame(&directionalFrame, kLRO);
}
break;
}
if (NS_SUCCEEDED(rv) ) {
mLogicalFrames.AppendElement(directionalFrame);
}
}
frame->GetFrameType(getter_AddRefs(frameType) );
if ( (!display->IsBlockLevel() )
&& ( (nsLayoutAtoms::inlineFrame == frameType.get() )
|| (nsLayoutAtoms::positionedInlineFrame == frameType.get() )
|| (nsLayoutAtoms::letterFrame == frameType.get() )
|| (nsLayoutAtoms::blockFrame == frameType.get() ) ) ) {
frame->FirstChild(aPresContext, nsnull, &kid);
res = InitLogicalArray(aPresContext, kid, aNextInFlow, aAddMarkers);
}
else { // bidi leaf
mLogicalFrames.AppendElement(frame);
}
// If the element is attributed by dir, indicate direction pop (add PDF frame)
if (NS_SUCCEEDED(rv) ) {
rv = NS_NewDirectionalFrame(&directionalFrame, kPDF);
if (NS_SUCCEEDED(rv) ) {
mLogicalFrames.AppendElement(directionalFrame);
}
}
} // for
return res;
}
void
nsBidiPresUtils::CreateBlockBuffer(nsIPresContext* aPresContext)
{
mBuffer.SetLength(0);
nsIFrame* frame;
nsIContent* prevContent = nsnull;
nsCOMPtr<nsIContent> content;
nsCOMPtr<nsITextContent> textContent;
nsCOMPtr<nsIAtom> frameType;
const nsTextFragment* frag;
PRUint32 i;
PRUint32 count = mLogicalFrames.Count();
for (i = 0; i < count; i++) {
frame = (nsIFrame*) (mLogicalFrames[i]);
frame->GetFrameType(getter_AddRefs(frameType) );
if (nsLayoutAtoms::textFrame == frameType.get() ) {
mSuccess = frame->GetContent(getter_AddRefs(content) );
if ( (NS_FAILED(mSuccess) ) || (!content) ) {
break;
}
if (content.get() == prevContent) {
continue;
}
prevContent = content.get();
textContent = do_QueryInterface(content, &mSuccess);
if ( (NS_FAILED(mSuccess) ) || (!textContent) ) {
break;
}
textContent->GetText(&frag);
if (!frag) {
mSuccess = NS_ERROR_FAILURE;
break;
}
frag->AppendTo(mBuffer);
}
else if (nsLayoutAtoms::brFrame == frameType.get() ) { // break frame
// Append line separator
mBuffer.Append( (PRUnichar) kLineSeparator);
}
else if (nsLayoutAtoms::directionalFrame == frameType.get() ) {
nsDirectionalFrame* dirFrame;
frame->QueryInterface(NS_GET_IID(nsDirectionalFrame),
(void**) &dirFrame);
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( (PRUnichar) kObjectSubstitute);
}
}
// XXX: TODO: Handle preformatted text ('\n')
mBuffer.ReplaceChar("\t\r\n", kSpace);
}
void
nsBidiPresUtils::ReorderFrames(nsIPresContext* aPresContext,
nsIRenderingContext* aRendContext,
nsIFrame* aFirstChild,
nsIFrame* aNextInFlow,
PRInt32 aChildCount)
{
mLogicalFrames.Clear();
if (NS_SUCCEEDED(InitLogicalArray(aPresContext, aFirstChild, aNextInFlow))
&& (mLogicalFrames.Count() > 1)) {
PRBool bidiEnabled;
// Set bidiEnabled to true if the line is reordered
Reorder(aPresContext, bidiEnabled);
if (bidiEnabled) {
RepositionInlineFrames(aPresContext, aRendContext, aFirstChild, aChildCount);
}
}
}
nsresult
nsBidiPresUtils::Reorder(nsIPresContext* aPresContext,
PRBool& aBidiEnabled)
{
aBidiEnabled = PR_FALSE;
PRInt32 count = mLogicalFrames.Count();
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 = (nsIFrame*) (mLogicalFrames[i]);
frame->GetBidiProperty(aPresContext, nsLayoutAtoms::embeddingLevel,
(void**)&mLevels[i], sizeof(mLevels[i]) );
}
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]) {
aBidiEnabled = PR_TRUE;
}
}
} // NS_SUCCEEDED(mSuccess)
} // indexMap
if (NS_FAILED(mSuccess) ) {
aBidiEnabled = PR_FALSE;
}
return mSuccess;
}
void
nsBidiPresUtils::RepositionInlineFrames(nsIPresContext* aPresContext,
nsIRenderingContext* aRendContext,
nsIFrame* aFirstChild,
PRInt32 aChildCount) const
{
PRInt32 count = mVisualFrames.Count();
if (count < 2) {
return;
}
nsIFrame* frame = (nsIFrame*) (mVisualFrames[0]);
nsPoint origin;
nsRect rect;
PRInt32 i;
#ifdef FIX_FOR_BUG_40882
PRInt32 ch;
PRInt32 charType;
nscoord width, dWidth, alefWidth = 0, dx = 0;
PRUnichar buf[2] = {ALEF, 0x0000};
PRBool isBidiSystem;
PRUint32 hints = 0;
aRendContext->GetHints(hints);
isBidiSystem = (hints & NS_RENDERING_HINT_BIDI_REORDERING);
#endif // bug
frame->GetRect(rect);
if (frame != aFirstChild) {
aFirstChild->GetOrigin(origin);
rect.x = origin.x;
frame->MoveTo(aPresContext, rect.x, rect.y);
}
for (i = 1; i < count; i++) {
#ifdef FIX_FOR_BUG_40882
ch = 0;
( (nsIFrame*)mVisualFrames[i])->GetBidiProperty(aPresContext,
nsLayoutAtoms::charType, (void**)&charType,sizeof(charType));
if (CHARTYPE_IS_RTL(charType) ) {
frame->GetBidiProperty(aPresContext,
nsLayoutAtoms::endsInDiacritic, (void**)&ch,sizeof(ch));
if (ch) {
if (!alefWidth) {
aRendContext->GetWidth(buf, 1, alefWidth, nsnull);
}
dWidth = 0;
if (isBidiSystem) {
buf[1] = (PRUnichar) ch;
aRendContext->GetWidth(buf, 2, width, nsnull);
dWidth = width - alefWidth;
}
if (dWidth <= 0) {
frame->MoveTo(aPresContext, rect.x + (nscoord)((float)width/8), rect.y);
}
}
}
#endif // bug
frame = (nsIFrame*) (mVisualFrames[i]);
frame->GetOrigin(origin);
frame->MoveTo(aPresContext, rect.x + rect.width, origin.y);
#ifdef FIX_FOR_BUG_40882
if (ch) {
dx += (rect.width - dWidth);
frame->MoveTo(aPresContext, rect.x + dWidth, origin.y);
}
#endif // bug 40882
frame->GetRect(rect);
} // for
#ifdef FIX_FOR_BUG_40882
if (dx > 0) {
PRInt32 alignRight;
frame->GetBidiProperty(aPresContext, nsLayoutAtoms::baseLevel,
(void**) &alignRight,sizeof(alignRight));
if (0 == (alignRight & 1) ) {
const nsStyleText* styleText;
frame->GetStyleData(eStyleStruct_Text, (const nsStyleStruct*&) styleText);
if (NS_STYLE_TEXT_ALIGN_RIGHT == styleText->mTextAlign
|| NS_STYLE_TEXT_ALIGN_MOZ_RIGHT == styleText->mTextAlign) {
alignRight = 1;
}
}
if (alignRight & 1) {
for (i = 0; i < count; i++) {
frame = (nsIFrame*) (mVisualFrames[i]);
frame->GetOrigin(origin);
frame->MoveTo(aPresContext, origin.x + dx, origin.y);
}
}
}
#endif // bug
// Now adjust inline container frames.
// Example: LTR paragraph
// <p><b>english HEBREW</b> 123</p>
// should be displayed as
// <p><b>english </b>123 <b>WERBEH</b></p>
// We assume that <b></b> rectangle takes all the room from "english" left edge to
// "WERBEH" right edge.
nsCOMPtr<nsIAtom> frameType;
frame = aFirstChild;
for (i = 0; i < aChildCount; i++) {
frame->GetFrameType(getter_AddRefs(frameType) );
if ( frameType.get()
&& ( (nsLayoutAtoms::inlineFrame == frameType.get() )
|| (nsLayoutAtoms::positionedInlineFrame == frameType.get() )
|| (nsLayoutAtoms::letterFrame == frameType.get() )
|| (nsLayoutAtoms::blockFrame == frameType.get() ) ) ) {
PRInt32 minX = 0x7FFFFFFF;
PRInt32 maxX = 0;
RepositionContainerFrame(aPresContext, frame, minX, maxX);
}
frame->GetNextSibling(&frame);
} // for
}
void
nsBidiPresUtils::RepositionContainerFrame(nsIPresContext* aPresContext,
nsIFrame* aContainer,
PRInt32& aMinX,
PRInt32& aMaxX) const
{
nsIFrame* frame;
nsIFrame* firstChild;
nsCOMPtr<nsIAtom> frameType;
nsRect rect;
PRInt32 minX = 0x7FFFFFFF;
PRInt32 maxX = 0;
aContainer->FirstChild(aPresContext, nsnull, &firstChild);
for (frame = firstChild; frame; frame->GetNextSibling(&frame) ) {
frame->GetFrameType(getter_AddRefs(frameType) );
if ( (frameType.get() )
&& ( (nsLayoutAtoms::inlineFrame == frameType.get() )
|| (nsLayoutAtoms::positionedInlineFrame == frameType.get() )
|| (nsLayoutAtoms::letterFrame == frameType.get() )
|| (nsLayoutAtoms::blockFrame == frameType.get() ) ) ) {
RepositionContainerFrame(aPresContext, frame, minX, maxX);
}
else {
frame->GetRect(rect);
minX = PR_MIN(minX, rect.x);
maxX = PR_MAX(maxX, rect.x + rect.width);
}
}
aMinX = PR_MIN(minX, aMinX);
aMaxX = PR_MAX(maxX, aMaxX);
if (minX < maxX) {
aContainer->GetRect(rect);
rect.x = minX;
rect.width = maxX - minX;
aContainer->SetRect(aPresContext, rect);
}
// Now adjust all the kids (kid's coordinates are relative to the parent's)
nsPoint origin;
for (frame = firstChild; frame; frame->GetNextSibling(&frame) ) {
frame->GetOrigin(origin);
frame->MoveTo(aPresContext, origin.x - minX, origin.y);
}
}
PRBool
nsBidiPresUtils::EnsureBidiContinuation(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aFrame,
nsIFrame** aNewFrame,
PRInt32& aFrameIndex)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (!aNewFrame) {
return PR_FALSE;
}
*aNewFrame = nsnull;
if (!aFrame) {
return PR_FALSE;
}
if (aFrameIndex + 1 < mLogicalFrames.Count() ) {
nsIFrame* frame = (nsIFrame*)mLogicalFrames[aFrameIndex + 1];
nsCOMPtr<nsIContent> content;
nsresult rv = frame->GetContent(getter_AddRefs(content) );
if (NS_SUCCEEDED(rv) && (content.get() == aContent) ) {
*aNewFrame = frame;
++aFrameIndex;
aFrame->SetNextInFlow(nsnull);
frame->SetPrevInFlow(nsnull);
}
}
if (nsnull == *aNewFrame) {
mSuccess = CreateBidiContinuation(aPresContext, aContent, aFrame, aNewFrame);
if (NS_FAILED(mSuccess) ) {
return PR_FALSE;
}
}
aFrame->SetBidiProperty(aPresContext, nsLayoutAtoms::nextBidi,
(void*) *aNewFrame);
return PR_TRUE;
}
PRBool
nsBidiPresUtils::RemoveBidiContinuation(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIFrame* aNextFrame,
nsIContent* aContent,
PRInt32& aFrameIndex,
PRInt32& aOffset) const
{
if (!aFrame) {
return PR_FALSE;
}
nsCOMPtr<nsIContent> content;
nsCOMPtr<nsIAtom> frameType;
nsIFrame* frame;
PRInt32 index;
PRInt32 newIndex = -1;
PRInt32 frameCount = mLogicalFrames.Count();
for (index = aFrameIndex + 1; index < frameCount; index++) {
// frames with the same content may not be adjacent. So check all frames.
frame = (nsIFrame*) mLogicalFrames[index];
frame->GetContent(getter_AddRefs(content) );
if (content.get() == aContent) {
newIndex = index;
}
}
if (-1 == newIndex) {
return PR_FALSE;
}
nsIFrame* nextBidi;
nsIFrame* parent;
aFrame->GetParent(&parent);
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell) );
aOffset = 0;
for (index = newIndex; index > aFrameIndex; index--) {
frame = (nsIFrame*) mLogicalFrames[index];
frame->GetFrameType(getter_AddRefs(frameType) );
if (nsLayoutAtoms::directionalFrame == frameType.get() ) {
delete frame;
++aOffset;
}
else {
nsFrameState frameState;
frame->GetFrameState(&frameState);
if (frameState & NS_FRAME_IS_BIDI) {
// only delete Bidi frames
if (parent != nsnull) {
parent->RemoveFrame(aPresContext, *presShell,
nsLayoutAtoms::nextBidi, frame);
}
else {
frame->Destroy(aPresContext);
}
}
}
}
if (aNextFrame) {
nsCOMPtr<nsIFrameManager> frameManager;
presShell->GetFrameManager(getter_AddRefs(frameManager) );
if (frameManager) {
// Remove nextBidi property, associated with the current frame
// and with all of its prev-in-flow.
frame = aFrame;
do {
frameManager->RemoveFrameProperty(frame, nsLayoutAtoms::nextBidi);
frame->GetPrevInFlow(&frame);
if (!frame) {
break;
}
frameManager->GetFrameProperty(frame, nsLayoutAtoms::nextBidi,
0, (void**) &nextBidi);
} while (aNextFrame == nextBidi);
} // if (frameManager)
} // if (aNextFrame)
aFrameIndex = newIndex;
return PR_TRUE;
}
nsresult
nsBidiPresUtils::FormatUnicodeText(nsIPresContext* aPresContext,
PRUnichar* aText,
PRInt32& aTextLength,
nsCharType aCharType,
PRBool aIsOddLevel,
PRBool aIsBidiSystem)
{
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(&bidiOptions);
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_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;
default:
break;
}
PRBool doReverse = PR_FALSE;
PRBool doShape = PR_FALSE;
if (aIsBidiSystem) {
if ( (CHARTYPE_IS_RTL(aCharType)) ^ (aIsOddLevel) )
doReverse = PR_TRUE;
}
else {
if (aIsOddLevel)
doReverse = PR_TRUE;
if (eCharType_RightToLeftArabic == aCharType)
doShape = PR_TRUE;
}
if (doReverse || doShape) {
PRInt32 newLen;
if (mBuffer.Length() < aTextLength) {
mBuffer.SetLength(aTextLength);
}
PRUnichar* buffer = NS_CONST_CAST(PRUnichar*, mBuffer.get());
if (doReverse) {
rv = mBidiEngine->WriteReverse(aText, aTextLength, buffer,
NSBIDI_DO_MIRRORING, &newLen);
if (NS_SUCCEEDED(rv) ) {
aTextLength = newLen;
memcpy(aText, buffer, aTextLength * sizeof(PRUnichar) );
}
}
if (doShape) {
rv = ArabicShaping(aText, aTextLength, buffer, (PRUint32 *)&newLen,
PR_FALSE, PR_FALSE);
if (NS_SUCCEEDED(rv) ) {
aTextLength = newLen;
memcpy(aText, buffer, aTextLength * sizeof(PRUnichar) );
}
}
}
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++) {
if (mBidiEngine->IsBidiControl(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;
PRBool inFERange = PR_FALSE;
PRInt32 offset;
nsCharType charType;
aCharType = eCharType_OtherNeutral;
for (offset = aOffset; offset < aCharTypeLimit; offset++) {
// Make sure we give RTL chartype to all that stuff that would be classified
// as Right-To-Left by a bidi platform.
// (May differ from the UnicodeData, eg we set RTL chartype to some NSM's,
// and set LTR chartype to FE-ranged Arabic.)
if (IS_HEBREW_CHAR(mBuffer[offset]) ) {
charType = eCharType_RightToLeft;
}
else if (IS_ARABIC_ALPHABETIC(mBuffer[offset]) ) {
charType = eCharType_RightToLeftArabic;
}
else if (IS_FE_CHAR(mBuffer[offset]) ) {
charType = eCharType_LeftToRight;
inFERange = PR_TRUE;
}
else {
// IBMBIDI - Egypt - Start
mBidiEngine->GetCharTypeAt(offset, &charType);
// IBMBIDI - Egypt - End
}
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;
}
}
if (inFERange) {
aPrevCharType = eCharType_RightToLeftArabic;
}
aOffset = offset;
}
nsresult nsBidiPresUtils::GetBidiEngine(nsBidi** aBidiEngine)
{
nsresult rv = NS_ERROR_FAILURE;
if (mBidiEngine) {
*aBidiEngine = mBidiEngine;
rv = NS_OK;
}
return rv;
}
nsresult nsBidiPresUtils::RenderText(PRUnichar* aText,
PRInt32 aLength,
nsBidiDirection aBaseDirection,
nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nscoord aX,
nscoord aY)
{
PRInt32 runCount;
mBuffer.Assign(aText);
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 width;
PRBool isRTL = PR_FALSE;
PRInt32 i, start, limit, length;
PRUint8 charType;
PRUint8 prevType = eCharType_LeftToRight;
nsBidiLevel level;
PRUint32 hints = 0;
aRenderingContext.GetHints(hints);
PRBool isBidiSystem = (hints & NS_RENDERING_HINT_BIDI_REORDERING);
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;
while (subRunCount > 0) {
// CalculateCharType can increment subRunCount if the run
// contains mixed character types
CalculateCharType(lineOffset, typeLimit, subRunLimit, subRunLength, subRunCount, charType, prevType);
if (eCharType_RightToLeftArabic == charType) {
isBidiSystem = (hints & NS_RENDERING_HINT_ARABIC_SHAPING);
}
if (isBidiSystem && (CHARTYPE_IS_RTL(charType) ^ isRTL) ) {
// set reading order into DC
isRTL = !isRTL;
aRenderingContext.SetRightToLeftText(isRTL);
}
FormatUnicodeText(aPresContext, aText + start, subRunLength,
(nsCharType)charType, level & 1,
isBidiSystem);
aRenderingContext.GetWidth(aText + start, subRunLength, width, nsnull);
aRenderingContext.DrawString(aText + start, subRunLength, aX, aY, width);
aX += width;
--subRunCount;
start = lineOffset;
subRunLimit = typeLimit;
subRunLength = typeLimit - lineOffset;
} // while
} // for
// Restore original reading order
if (isRTL) {
aRenderingContext.SetRightToLeftText(PR_FALSE);
}
return NS_OK;
}
nsresult
nsBidiPresUtils::ReorderUnicodeText(PRUnichar* aText,
PRInt32& aTextLength,
nsCharType aCharType,
PRBool aIsOddLevel,
PRBool aIsBidiSystem)
{
NS_ASSERTION(aIsOddLevel == 0 || aIsOddLevel == 1, "aIsOddLevel should be 0 or 1");
nsresult rv = NS_OK;
PRBool doReverse = PR_FALSE;
if (aIsBidiSystem) {
if ( (CHARTYPE_IS_RTL(aCharType)) ^ (aIsOddLevel) )
doReverse = PR_TRUE;
}
else {
if (aIsOddLevel)
doReverse = PR_TRUE;
}
if (doReverse) {
PRInt32 newLen;
if (mBuffer.Length() < aTextLength) {
mBuffer.SetLength(aTextLength);
}
PRUnichar* buffer = NS_CONST_CAST(PRUnichar*, mBuffer.get());
if (doReverse) {
rv = mBidiEngine->WriteReverse(aText, aTextLength, buffer,
NSBIDI_DO_MIRRORING, &newLen);
if (NS_SUCCEEDED(rv) ) {
aTextLength = newLen;
memcpy(aText, buffer, aTextLength * sizeof(PRUnichar) );
}
}
}
return rv;
}
#endif // IBMBIDI
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