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be1535321a
Compute the amount of text in the scope of an nsFontInflationData object. This walks the text that's inside of the block formatting context at which this object is rooted, excluding the text that's inside any nested BFC. Using the amount of text, the font sizes of the text, and the line threshold preference, we compute whether to enable font size inflation within that block formatting context.
312 lines
9.5 KiB
C++
312 lines
9.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Novell code.
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*
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* The Initial Developer of the Original Code is Novell Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* robert@ocallahan.org
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* Ehsan Akhgari <ehsan.akhgari@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsTextFrameUtils.h"
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#include "nsContentUtils.h"
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#include "nsIWordBreaker.h"
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#include "gfxFont.h"
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#include "nsUnicharUtils.h"
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#include "nsBidiUtils.h"
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#include "nsIContent.h"
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#include "nsStyleStruct.h"
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// XXX TODO implement transform of backslash to yen that nsTextTransform does
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// when requested by PresContext->LanguageSpecificTransformType(). Do it with
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// a new factory type that just munges the input stream. But first, check
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// that we really still need this, it's only enabled via a hidden pref
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// which defaults false...
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#define UNICODE_ZWSP 0x200B
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static bool IsDiscardable(PRUnichar ch, PRUint32* aFlags)
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{
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// Unlike IS_DISCARDABLE, we don't discard \r. \r will be ignored by gfxTextRun
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// and discarding it would force us to copy text in many cases of preformatted
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// text containing \r\n.
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if (ch == CH_SHY) {
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*aFlags |= nsTextFrameUtils::TEXT_HAS_SHY;
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return true;
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}
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if ((ch & 0xFF00) != 0x2000) {
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// Not a Bidi control character
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return false;
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}
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return IS_BIDI_CONTROL_CHAR(ch);
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}
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static bool IsDiscardable(PRUint8 ch, PRUint32* aFlags)
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{
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if (ch == CH_SHY) {
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*aFlags |= nsTextFrameUtils::TEXT_HAS_SHY;
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return true;
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}
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return false;
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}
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PRUnichar*
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nsTextFrameUtils::TransformText(const PRUnichar* aText, PRUint32 aLength,
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PRUnichar* aOutput,
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CompressionMode aCompression,
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PRUint8* aIncomingFlags,
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gfxSkipCharsBuilder* aSkipChars,
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PRUint32* aAnalysisFlags)
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{
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PRUint32 flags = 0;
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PRUnichar* outputStart = aOutput;
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bool lastCharArabic = false;
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if (aCompression == COMPRESS_NONE) {
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// Skip discardables.
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PRUint32 i;
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for (i = 0; i < aLength; ++i) {
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PRUnichar ch = *aText++;
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if (IsDiscardable(ch, &flags)) {
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aSkipChars->SkipChar();
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} else {
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aSkipChars->KeepChar();
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if (ch == '\t') {
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flags |= TEXT_HAS_TAB;
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} else if (ch != ' ' && ch != '\n') {
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// we already know it's not a tab from the previous check
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lastCharArabic = IS_ARABIC_CHAR(ch);
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}
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*aOutput++ = ch;
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}
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}
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if (lastCharArabic) {
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*aIncomingFlags |= INCOMING_ARABICCHAR;
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} else {
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*aIncomingFlags &= ~INCOMING_ARABICCHAR;
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}
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*aIncomingFlags &= ~INCOMING_WHITESPACE;
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} else {
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bool inWhitespace = (*aIncomingFlags & INCOMING_WHITESPACE) != 0;
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PRUint32 i;
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for (i = 0; i < aLength; ++i) {
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PRUnichar ch = *aText++;
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bool nowInWhitespace;
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if (ch == ' ' &&
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(i + 1 >= aLength ||
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!IsSpaceCombiningSequenceTail(aText, aLength - (i + 1)))) {
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nowInWhitespace = true;
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} else if (ch == '\n' && aCompression == COMPRESS_WHITESPACE_NEWLINE) {
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if (i > 0 && IS_CJ_CHAR(aText[-1]) &&
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i + 1 < aLength && IS_CJ_CHAR(aText[1])) {
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// Discard newlines between CJK chars.
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// XXX this really requires more context to get right!
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aSkipChars->SkipChar();
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continue;
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}
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nowInWhitespace = true;
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} else {
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nowInWhitespace = ch == '\t';
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}
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if (!nowInWhitespace) {
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if (IsDiscardable(ch, &flags)) {
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aSkipChars->SkipChar();
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nowInWhitespace = inWhitespace;
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} else {
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*aOutput++ = ch;
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aSkipChars->KeepChar();
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lastCharArabic = IS_ARABIC_CHAR(ch);
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}
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} else {
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if (inWhitespace) {
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aSkipChars->SkipChar();
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} else {
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if (ch != ' ') {
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flags |= TEXT_WAS_TRANSFORMED;
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}
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*aOutput++ = ' ';
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aSkipChars->KeepChar();
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}
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}
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inWhitespace = nowInWhitespace;
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}
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if (lastCharArabic) {
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*aIncomingFlags |= INCOMING_ARABICCHAR;
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} else {
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*aIncomingFlags &= ~INCOMING_ARABICCHAR;
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}
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if (inWhitespace) {
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*aIncomingFlags |= INCOMING_WHITESPACE;
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} else {
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*aIncomingFlags &= ~INCOMING_WHITESPACE;
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}
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}
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if (outputStart + aLength != aOutput) {
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flags |= TEXT_WAS_TRANSFORMED;
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}
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*aAnalysisFlags = flags;
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return aOutput;
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}
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PRUint8*
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nsTextFrameUtils::TransformText(const PRUint8* aText, PRUint32 aLength,
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PRUint8* aOutput,
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CompressionMode aCompression,
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PRUint8* aIncomingFlags,
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gfxSkipCharsBuilder* aSkipChars,
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PRUint32* aAnalysisFlags)
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{
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PRUint32 flags = 0;
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PRUint8* outputStart = aOutput;
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if (aCompression == COMPRESS_NONE) {
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// Skip discardables.
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PRUint32 i;
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for (i = 0; i < aLength; ++i) {
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PRUint8 ch = *aText++;
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if (IsDiscardable(ch, &flags)) {
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aSkipChars->SkipChar();
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} else {
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aSkipChars->KeepChar();
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if (ch == '\t') {
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flags |= TEXT_HAS_TAB;
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}
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*aOutput++ = ch;
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}
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}
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*aIncomingFlags &= ~(INCOMING_ARABICCHAR | INCOMING_WHITESPACE);
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} else {
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bool inWhitespace = (*aIncomingFlags & INCOMING_WHITESPACE) != 0;
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PRUint32 i;
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for (i = 0; i < aLength; ++i) {
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PRUint8 ch = *aText++;
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bool nowInWhitespace = ch == ' ' || ch == '\t' ||
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(ch == '\n' && aCompression == COMPRESS_WHITESPACE_NEWLINE);
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if (!nowInWhitespace) {
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if (IsDiscardable(ch, &flags)) {
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aSkipChars->SkipChar();
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nowInWhitespace = inWhitespace;
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} else {
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*aOutput++ = ch;
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aSkipChars->KeepChar();
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}
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} else {
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if (inWhitespace) {
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aSkipChars->SkipChar();
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} else {
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if (ch != ' ') {
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flags |= TEXT_WAS_TRANSFORMED;
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}
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*aOutput++ = ' ';
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aSkipChars->KeepChar();
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}
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}
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inWhitespace = nowInWhitespace;
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}
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*aIncomingFlags &= ~INCOMING_ARABICCHAR;
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if (inWhitespace) {
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*aIncomingFlags |= INCOMING_WHITESPACE;
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} else {
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*aIncomingFlags &= ~INCOMING_WHITESPACE;
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}
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}
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if (outputStart + aLength != aOutput) {
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flags |= TEXT_WAS_TRANSFORMED;
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}
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*aAnalysisFlags = flags;
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return aOutput;
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}
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PRUint32
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nsTextFrameUtils::ComputeApproximateLengthWithWhitespaceCompression(
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nsIContent *aContent, const nsStyleText *aStyleText)
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{
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const nsTextFragment *frag = aContent->GetText();
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// This is an approximation so we don't really need anything
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// too fancy here.
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PRUint32 len;
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if (aStyleText->WhiteSpaceIsSignificant()) {
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len = frag->GetLength();
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} else {
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bool is2b = frag->Is2b();
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union {
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const char *s1b;
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const PRUnichar *s2b;
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} u;
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if (is2b) {
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u.s2b = frag->Get2b();
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} else {
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u.s1b = frag->Get1b();
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}
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bool prevWS = true; // more important to ignore blocks with
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// only whitespace than get inline boundaries
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// exactly right
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len = 0;
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for (PRUint32 i = 0, i_end = frag->GetLength(); i < i_end; ++i) {
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PRUnichar c = is2b ? u.s2b[i] : u.s1b[i];
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if (c == ' ' || c == '\n' || c == '\t' || c == '\r') {
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if (!prevWS) {
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++len;
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}
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prevWS = true;
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} else {
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++len;
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prevWS = false;
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}
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}
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}
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return len;
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}
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bool nsSkipCharsRunIterator::NextRun() {
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do {
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if (mRunLength) {
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mIterator.AdvanceOriginal(mRunLength);
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NS_ASSERTION(mRunLength > 0, "No characters in run (initial length too large?)");
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if (!mSkipped || mLengthIncludesSkipped) {
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mRemainingLength -= mRunLength;
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}
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}
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if (!mRemainingLength)
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return false;
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PRInt32 length;
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mSkipped = mIterator.IsOriginalCharSkipped(&length);
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mRunLength = NS_MIN(length, mRemainingLength);
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} while (!mVisitSkipped && mSkipped);
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return true;
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}
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